Galvanized Steel Coating Thickness Chart | Baowu Steel<\/title>\r\n <meta name=\"description\" content=\"Complete galvanized steel coating thickness chart: ASTM A653 G90\/Z275, ASTM A123, ISO 1461, GB\/T 13912 standards. 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} }\r\n <\/style>\r\n<\/head>\r\n<body>\r\n\r\n<div class=\"page-container\">\r\n\r\n <section class=\"hero-section\">\r\n <h1>Galvanized Steel Coating Thickness Chart<\/h1>\r\n <p>Complete reference guide for zinc coating specifications: ASTM A653 G90\/Z275, ASTM A123, ISO 1461, GB\/T 13912. Convert oz\/ft\u00b2 to g\/m\u00b2 and microns instantly.<\/p>\r\n <\/section>\r\n\r\n <div class=\"breadcrumb\">\r\n <a href=\"https:\/\/baowu-steel.com\/\">Home<\/a> \u203a\r\n <a href=\"https:\/\/baowu-steel.com\/tools\/\">Tools<\/a> \u203a\r\n Galvanized Steel Coating Thickness Chart\r\n <\/div>\r\n\r\n <div class=\"content-wrapper\">\r\n <div class=\"three-col-grid\">\r\n\r\n \r\n <aside class=\"left-sidebar\">\r\n <div class=\"contact-card\">\r\n <h3>Contact Us<\/h3>\r\n <p>Get factory-direct pricing. Fast reply guaranteed.<\/p>\r\n <a href=\"mailto:sales@baowu-steel.com\" class=\"cta-btn\">Get Free Quote<\/a>\r\n <div class=\"contact-info\">\r\n <a href=\"tel:+8618764178985\"><span>\ud83d\udcde<\/span> +86 187 6417 8985<\/a>\r\n <a href=\"mailto:sales@baowu-steel.com\"><span>\u2709<\/span> sales@baowu-steel.com<\/a>\r\n <a href=\"https:\/\/wa.me\/8618764178985\" target=\"_blank\" rel=\"noopener\"><span>\ud83d\udcac<\/span> WhatsApp<\/a>\r\n <\/div>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Steel Tools<\/h3>\r\n <nav class=\"tool-links\">\r\n <a href=\"https:\/\/baowu-steel.com\/tools\/pipe-weight-calculator\/\"><span class=\"icon\">\ud83d\udccf<\/span> Steel Pipe Weight Calculator<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-plate-weight-calculator\/\"><span class=\"icon\">\ud83d\udcd0<\/span> Steel Plate Weight Calculator<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-coil-weight-calculator\/\"><span class=\"icon\">\u2699\ufe0f<\/span> Steel Coil Weight Calculator<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/galvanized-steel-coating-thickness-chart\/\" class=\"current\"><span class=\"icon\">\ud83d\udee1\ufe0f<\/span> Galvanized Steel Coating Thickness Chart<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-grade-comparison-chart\/\"><span class=\"icon\">\ud83d\udd0d<\/span> Steel Grade Comparison Chart<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/h-beam-weight-chart\/\"><span class=\"icon\">\ud83c\udfd7\ufe0f<\/span> H Beam Weight Chart<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-price-per-ton-today\/\"><span class=\"icon\">\ud83d\udcb0<\/span> Steel Price Per Ton Today<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-pipe-sizes-chart\/\"><span class=\"icon\">\ud83d\udcca<\/span> Steel Pipe Sizes Chart<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/sheet-metal-gauge-chart\/\"><span class=\"icon\">\ud83d\udccb<\/span> Sheet Metal Gauge Chart<\/a>\r\n <\/nav>\r\n <\/div>\r\n <\/aside>\r\n\r\n \r\n <main class=\"main-content\">\r\n\r\n \r\n <section class=\"card\">\r\n <h2>ASTM A653 Galvanized Coating Designations<\/h2>\r\n <p class=\"desc\">ASTM A653 covers steel sheet, zinc-coated (galvanized) by the hot-dip process. Coating designations range from G01 to G360 (imperial) and Z001 to Z1100 (metric). The designation represents the minimum triple-spot total both sides coating weight.<\/p>\r\n\r\n <h3>Common Coating Designations & Thickness Equivalents<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Imperial (G)<\/th><th>Metric (Z)<\/th><th>Total oz\/ft\u00b2<\/th><th>Total g\/m\u00b2<\/th><th>Per Side oz\/ft\u00b2<\/th><th>Per Side g\/m\u00b2<\/th><th>Thickness per Side (\u00b5m)<\/th><th>Thickness per Side (mils)<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>G30<\/td><td>Z090<\/td><td>0.30<\/td><td>90<\/td><td>0.15<\/td><td>45<\/td><td>~6.3<\/td><td>~0.25<\/td><\/tr>\r\n <tr><td>G40<\/td><td>Z120<\/td><td>0.40<\/td><td>120<\/td><td>0.20<\/td><td>60<\/td><td>~8.4<\/td><td>~0.33<\/td><\/tr>\r\n <tr><td>G60<\/td><td>Z180<\/td><td>0.60<\/td><td>180<\/td><td>0.30<\/td><td>90<\/td><td>~12.6<\/td><td>~0.50<\/td><\/tr>\r\n <tr class=\"highlight\"><td>G90<\/td><td>Z275<\/td><td>0.90<\/td><td>275<\/td><td>0.45<\/td><td>137.5<\/td><td>~19.3<\/td><td>~0.76<\/td><\/tr>\r\n <tr><td>G115<\/td><td>Z350<\/td><td>1.15<\/td><td>350<\/td><td>0.575<\/td><td>175<\/td><td>~24.5<\/td><td>~0.96<\/td><\/tr>\r\n <tr><td>G140<\/td><td>Z450<\/td><td>1.40<\/td><td>450<\/td><td>0.70<\/td><td>225<\/td><td>~31.5<\/td><td>~1.24<\/td><\/tr>\r\n <tr><td>G185<\/td><td>Z550<\/td><td>1.85<\/td><td>550<\/td><td>0.925<\/td><td>275<\/td><td>~38.5<\/td><td>~1.52<\/td><\/tr>\r\n <tr><td>G210<\/td><td>Z600<\/td><td>2.10<\/td><td>600<\/td><td>1.05<\/td><td>300<\/td><td>~42.0<\/td><td>~1.65<\/td><\/tr>\r\n <tr><td>G235<\/td><td>Z700<\/td><td>2.35<\/td><td>700<\/td><td>1.175<\/td><td>350<\/td><td>~49.0<\/td><td>~1.93<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">Note: 1 oz\/ft\u00b2 = 305 g\/m\u00b2. Zinc density = 7.14 g\/cm\u00b3. Thickness calculated as: coating weight per side \u00f7 density. Actual thickness may vary \u00b110-15% due to surface roughness and steel chemistry.<\/p>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>Unit Conversion Quick Reference<\/h2>\r\n <p>Standard conversion factors for zinc coating measurements:<\/p>\r\n <div class=\"conversion-grid\">\r\n <div class=\"conversion-item\"><div class=\"num\">305<\/div><div class=\"label\">1 oz\/ft\u00b2 = 305 g\/m\u00b2<\/div><\/div>\r\n <div class=\"conversion-item\"><div class=\"num\">7.14<\/div><div class=\"label\">Zinc Density = 7.14 g\/cm\u00b3<\/div><\/div>\r\n <div class=\"conversion-item\"><div class=\"num\">1.7<\/div><div class=\"label\">1 oz\/ft\u00b2 \u2248 1.7 mils (43 \u00b5m) zinc thickness<\/div><\/div>\r\n <\/div>\r\n <h3>Conversion Formulas<\/h3>\r\n <div class=\"formula-box\">\r\n <h4>Weight to Thickness<\/h4>\r\n <code class=\"formula\">Thickness (\u00b5m) = Coating Weight (g\/m\u00b2) \u00f7 7.14<\/code>\r\n <p class=\"tip\">For single-side coating: divide total g\/m\u00b2 by 2 first.<\/p>\r\n <\/div>\r\n <div class=\"formula-box\">\r\n <h4>Imperial to Metric<\/h4>\r\n <code class=\"formula\">g\/m\u00b2 = oz\/ft\u00b2 \u00d7 305<\/code>\r\n <p class=\"tip\">Example: G90 = 0.90 oz\/ft\u00b2 = 0.90 \u00d7 305 \u2248 275 g\/m\u00b2<\/p>\r\n <\/div>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>ASTM A123 Structural Galvanizing Requirements<\/h2>\r\n <p class=\"desc\">ASTM A123 covers zinc coating (hot-dip galvanizing) on iron and steel structural shapes, plate, pipe, tubing, and wire. Minimum average coating thickness depends on material category and measured steel thickness.<\/p>\r\n\r\n <h3>Minimum Average Coating Thickness (\u00b5m) by Material Category<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Material Category<\/th><th><1.6mm<\/th><th>1.6\u20133.2mm<\/th><th>3.2\u20134.8mm<\/th><th>4.8\u20136.4mm<\/th><th>6.4\u201316.0mm<\/th><th>>16.0mm<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>Structural Shapes<\/td><td>45<\/td><td>65<\/td><td>75<\/td><td>75<\/td><td>100<\/td><td>100<\/td><\/tr>\r\n <tr><td>Strip and Bar<\/td><td>45<\/td><td>65<\/td><td>75<\/td><td>75<\/td><td>75<\/td><td>100<\/td><\/tr>\r\n <tr><td>Plate<\/td><td>45<\/td><td>65<\/td><td>75<\/td><td>75<\/td><td>75<\/td><td>100<\/td><\/tr>\r\n <tr><td>Pipe & Tubing<\/td><td>45<\/td><td>45<\/td><td>75<\/td><td>75<\/td><td>75<\/td><td>75<\/td><\/tr>\r\n <tr><td>Wire<\/td><td>35<\/td><td>50<\/td><td>60<\/td><td>65<\/td><td>80<\/td><td>80<\/td><\/tr>\r\n <tr><td>Reinforcing Bar<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><td>100<\/td><td>100<\/td><\/tr>\r\n <tr><td>Forgings & Castings<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><td>100<\/td><td>100<\/td><td>100<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">Note: ASTM A123 requires individual specimen coating thickness to be at least one coating grade below the minimum average. All coating thickness requirements are minimums; no maximum exists in the specification.<\/p>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>ISO 1461 Hot Dip Galvanizing Standard<\/h2>\r\n <p class=\"desc\">EN ISO 1461 is the European and international standard for hot-dip galvanized coatings on fabricated iron and steel articles (non-centrifuged).<\/p>\r\n\r\n <h3>Minimum Coating Thickness Requirements (Non-Centrifuged)<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Steel Thickness (mm)<\/th><th>Local Thickness Minimum (\u00b5m)<\/th><th>Average Thickness Minimum (\u00b5m)<\/th><th>Coating Mass (g\/m\u00b2)<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>\u2265 6 mm<\/td><td>70<\/td><td>85<\/td><td>505<\/td><\/tr>\r\n <tr><td>\u2265 3 mm to < 6 mm<\/td><td>55<\/td><td>70<\/td><td>395<\/td><\/tr>\r\n <tr><td>\u2265 1.5 mm to < 3 mm<\/td><td>45<\/td><td>55<\/td><td>325<\/td><\/tr>\r\n <tr><td>< 1.5 mm<\/td><td>35<\/td><td>45<\/td><td>250<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">For grit-blasted surfaces prior to galvanizing, a nominal coating thickness of 1000 g\/m\u00b2 (140 \u00b5m) can be specified for steel \u22656 mm.<\/p>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>GB\/T 13912 Chinese National Standard<\/h2>\r\n <p class=\"desc\">GB\/T 13912-2020 specifies technical requirements and test methods for hot-dip galvanized coatings on fabricated iron and steel articles (excluding continuous sheet and tube).<\/p>\r\n\r\n <h3>Coating Thickness Requirements (Non-Centrifuged)<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Steel Thickness (mm)<\/th><th>Average Thickness (\u00b5m)<\/th><th>Local Thickness Minimum (\u00b5m)<\/th><th>Coating Mass (g\/m\u00b2)<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>\u2265 6 mm<\/td><td>> 85<\/td><td>70<\/td><td>505<\/td><\/tr>\r\n <tr><td>> 3 mm to < 6 mm<\/td><td>> 70<\/td><td>55<\/td><td>395<\/td><\/tr>\r\n <tr><td>> 1.5 mm to \u2264 3 mm<\/td><td>> 55<\/td><td>45<\/td><td>325<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <h3>Centrifuged Articles (e.g., Fasteners)<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Diameter (mm)<\/th><th>Local Thickness Minimum (\u00b5m)<\/th><th>Coating Mass (g\/m\u00b2)<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>> 6 mm (threaded)<\/td><td>40<\/td><td>285<\/td><\/tr>\r\n <tr><td>\u2264 6 mm (threaded)<\/td><td>20<\/td><td>140<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">GB\/T 13912-2020 updated from 2002 version with additional terminology definitions and expanded repair requirements.<\/p>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>International Standards Comparison<\/h2>\r\n <p class=\"desc\">Comparison of common coating designations across major international standards (total both sides).<\/p>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>GB\/T 2518 (CN)<\/th><th>JIS G3302 (JP)<\/th><th>EN 10327 (EU)<\/th><th>ASTM A653 (US)<\/th><th>Total g\/m\u00b2<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>Z060<\/td><td>Z06<\/td><td>Z060<\/td><td>\u2014<\/td><td>60<\/td><\/tr>\r\n <tr><td>Z080<\/td><td>Z08<\/td><td>Z080<\/td><td>\u2014<\/td><td>80<\/td><\/tr>\r\n <tr><td>Z090<\/td><td>Z09<\/td><td>Z090<\/td><td>G30<\/td><td>90<\/td><\/tr>\r\n <tr><td>Z100<\/td><td>Z10<\/td><td>Z100<\/td><td>\u2014<\/td><td>100<\/td><\/tr>\r\n <tr><td>Z120<\/td><td>Z12<\/td><td>Z120<\/td><td>G40<\/td><td>120<\/td><\/tr>\r\n <tr class=\"highlight\"><td>Z180<\/td><td>Z18<\/td><td>Z180<\/td><td>G60<\/td><td>180<\/td><\/tr>\r\n <tr><td>Z250<\/td><td>Z25<\/td><td>Z250<\/td><td>\u2014<\/td><td>250<\/td><\/tr>\r\n <tr class=\"highlight\"><td>Z275<\/td><td>Z27<\/td><td>Z275<\/td><td>G90<\/td><td>275<\/td><\/tr>\r\n <tr><td>Z350<\/td><td>Z35<\/td><td>Z350<\/td><td>G115<\/td><td>350<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>Weight Increase Due to Zinc Coating<\/h2>\r\n <p class=\"desc\">Galvanizing adds weight to the base steel. The actual increase depends on steel thickness, shape, surface area-to-weight ratio, and coating thickness.<\/p>\r\n\r\n <h3>Typical Weight Increase by Steel Type<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Coating Thickness<\/th><th>Steel Type<\/th><th>Surface Area (ft\u00b2\/ton)<\/th><th>Zinc Added (lbs)<\/th><th>Weight Increase %<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>3.0 mils (1.7 oz\/ft\u00b2)<\/td><td>Light Truss<\/td><td>500<\/td><td>990<\/td><td>~2.6%<\/td><\/tr>\r\n <tr><td>4.0 mils (2.2 oz\/ft\u00b2)<\/td><td>Typical Mix Shapes<\/td><td>250<\/td><td>660<\/td><td>~1.7%<\/td><\/tr>\r\n <tr><td>5.0 mils (2.8 oz\/ft\u00b2)<\/td><td>Heavy Structural<\/td><td>100<\/td><td>330<\/td><td>~0.9%<\/td><\/tr>\r\n <tr><td>7.0 mils (3.9 oz\/ft\u00b2)<\/td><td>Reactive Steel (High Si\/P)<\/td><td>500<\/td><td>2,309<\/td><td>~6.1%<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">On average, the galvanized coating increases the weight of black steel by up to 15%, depending on factors including steel chemistry (silicon\/phosphorus content significantly affects coating thickness), shape, size, and surface conditions. Typical increase is 3-6% for most structural fabrications.<\/p>\r\n\r\n <h3>Coating Weight Estimation<\/h3>\r\n <div class=\"formula-box\">\r\n <h4>Quick Estimation for Pipes<\/h4>\r\n <code class=\"formula\">Galvanized Weight \u2248 Black Steel Weight \u00d7 (1 + 3% to 6%)<\/code>\r\n <p class=\"tip\">For precise calculations, use the steel coil weight calculator with galvanized density (~8.05 g\/cm\u00b3).<\/p>\r\n <\/div>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>Coating Thickness Measurement Methods<\/h2>\r\n <p class=\"desc\">Four primary methods are used to measure hot-dip galvanized coating thickness, per ASTM E376 and ISO 2178.<\/p>\r\n\r\n <h3>Measurement Techniques<\/h3>\r\n <ul>\r\n <li><strong>Magnetic Thickness Gauge (Most Common)<\/strong> \u2014 Non-destructive, measures non-magnetic coating on magnetic steel substrate. Calibration per ASTM E376. Accuracy: \u00b15% of reading.<\/li>\r\n <li><strong>Weigh-Strip-Weigh (Referee Method)<\/strong> \u2014 Sample weighed, coating stripped in inhibited acid, then re-weighed. Most accurate laboratory method.<\/li>\r\n <li><strong>Weighing Before and After Galvanizing<\/strong> \u2014 Practical for large articles; measures total zinc pickup.<\/li>\r\n <li><strong>Optical Microscopy<\/strong> \u2014 Cross-section examination; used for research and failure analysis.<\/li>\r\n <\/ul>\r\n\r\n <h3>ASTM E376 Key Points<\/h3>\r\n <ul>\r\n <li>Surface roughness can cause gauges to read high (Base Metal Reading effect).<\/li>\r\n <li>Gauges should be calibrated on uncoated substrate with similar roughness and metallurgy.<\/li>\r\n <li>Minimum 5 readings per measurement area, average reported.<\/li>\r\n <li>Electronic\/digital gauges offer best repeatability.<\/li>\r\n <\/ul>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>Frequently Asked Questions<\/h2>\r\n\r\n <div class=\"faq open\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">What does G90 coating designation mean?<\/div>\r\n <div class=\"faq-answer\">G90 is an ASTM A653 designation meaning 0.90 oz\/ft\u00b2 total zinc coating on both sides. If evenly applied, each side has 0.45 oz\/ft\u00b2 (approx. 137.5 g\/m\u00b2). Equivalent to Z275 in metric designation. The \"G\" stands for \"galvanized\".<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">How do I convert oz\/ft\u00b2 to g\/m\u00b2?<\/div>\r\n <div class=\"faq-answer\">Multiply oz\/ft\u00b2 by 305. Example: G90 = 0.90 \u00d7 305 = 274.5 g\/m\u00b2 (rounded to Z275). For single-side conversion, divide the total by 2 first. 1 oz\/ft\u00b2 \u2248 305.15 g\/m\u00b2 precisely.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">What is the difference between ASTM A653 and ASTM A123?<\/div>\r\n <div class=\"faq-answer\">ASTM A653 covers continuously hot-dip galvanized steel sheet and coil (pre-galvanized). ASTM A123 covers hot-dip galvanizing of fabricated structural steel articles (post-fabrication galvanizing). A123 coating thicknesses are generally thicker than A653 sheet coatings.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">How thick is G90 galvanizing in microns?<\/div>\r\n <div class=\"faq-answer\">G90 provides approximately 19-21 \u00b5m of zinc thickness per side. Calculation: 275 g\/m\u00b2 total \u00f7 2 = 137.5 g\/m\u00b2 per side; 137.5 \u00f7 7.14 (zinc density) \u2248 19.3 \u00b5m per side.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">What is the minimum galvanizing thickness per ISO 1461?<\/div>\r\n <div class=\"faq-answer\">ISO 1461 minimum average thickness ranges from 45 \u00b5m (for steel <1.5 mm) to 85 \u00b5m (for steel \u22656 mm). Local thickness minimums are approximately 10-15 \u00b5m lower than average requirements.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">How much weight does galvanizing add to steel?<\/div>\r\n <div class=\"faq-answer\">Typical weight increase is 3-6% for most structural fabrications. Light-gauge trusses with high surface area-to-weight ratio may see 2-3% increase, while reactive steels can add 6-10% or more. Maximum can reach 15% in extreme cases.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">What is the most common galvanized coating for sheet steel?<\/div>\r\n <div class=\"faq-answer\">G90 (Z275) is the most widely specified coating for construction and general industrial applications. G60 (Z180) is common for automotive and appliances. G40 (Z120) is used for light-duty indoor applications.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">Does GB\/T 13912 match ISO 1461?<\/div>\r\n <div class=\"faq-answer\">GB\/T 13912-2020 is technically aligned with ISO 1461, with identical coating thickness requirements for most categories. The 2020 revision harmonized terminology and measurement methods with international practice.<\/div>\r\n <\/div>\r\n <\/section>\r\n <\/main>\r\n\r\n \r\n <aside class=\"right-sidebar\">\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Coating Quick Reference<\/h3>\r\n <ul class=\"quick-ref\">\r\n <li><span>G90 (Z275) total<\/span><span class=\"value\">275 g\/m\u00b2<\/span><\/li>\r\n <li><span>G90 per side<\/span><span class=\"value\">~19 \u00b5m<\/span><\/li>\r\n <li><span>G60 (Z180) total<\/span><span class=\"value\">180 g\/m\u00b2<\/span><\/li>\r\n <li><span>G60 per side<\/span><span class=\"value\">~13 \u00b5m<\/span><\/li>\r\n <li><span>Zinc density<\/span><span class=\"value\">7.14 g\/cm\u00b3<\/span><\/li>\r\n <li><span>1 oz\/ft\u00b2 =<\/span><span class=\"value\">305 g\/m\u00b2<\/span><\/li>\r\n <li><span>1 oz\/ft\u00b2 thickness<\/span><span class=\"value\">~1.7 mils<\/span><\/li>\r\n <\/ul>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>ASTM A123 Thickness Guide<\/h3>\r\n <ul class=\"quick-ref\">\r\n <li><span>Plate >6.4mm<\/span><span class=\"value\">100 \u00b5m<\/span><\/li>\r\n <li><span>Pipe 3.2-4.8mm<\/span><span class=\"value\">75 \u00b5m<\/span><\/li>\r\n <li><span>Pipe 1.6-3.2mm<\/span><span class=\"value\">45 \u00b5m<\/span><\/li>\r\n <li><span>Structural >6.4mm<\/span><span class=\"value\">100 \u00b5m<\/span><\/li>\r\n <li><span>Wire >6.4mm<\/span><span class=\"value\">80 \u00b5m<\/span><\/li>\r\n <li><span>Rebar all sizes<\/span><span class=\"value\">100 \u00b5m<\/span><\/li>\r\n <\/ul>\r\n <p style=\"font-size:9px;color:#aaa;margin-top:4px;\">Minimum average coating thickness<\/p>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Weight Increase Guide<\/h3>\r\n <ul class=\"quick-ref\">\r\n <li><span>Light truss<\/span><span class=\"value\">~2.6%<\/span><\/li>\r\n <li><span>Typical structural<\/span><span class=\"value\">~1.7%<\/span><\/li>\r\n <li><span>Heavy structural<\/span><span class=\"value\">~0.9%<\/span><\/li>\r\n <li><span>Reactive steel<\/span><span class=\"value\">~6.1%<\/span><\/li>\r\n <li><span>Average range<\/span><span class=\"value\">3-6%<\/span><\/li>\r\n <li><span>Maximum possible<\/span><span class=\"value\">~15%<\/span><\/li>\r\n <\/ul>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Unit Conversions<\/h3>\r\n <ul class=\"quick-ref\">\r\n <li><span>oz\/ft\u00b2 \u2192 g\/m\u00b2<\/span><span class=\"value\">\u00d7 305<\/span><\/li>\r\n <li><span>g\/m\u00b2 \u2192 oz\/ft\u00b2<\/span><span class=\"value\">\u00f7 305<\/span><\/li>\r\n <li><span>g\/m\u00b2 \u2192 \u00b5m<\/span><span class=\"value\">\u00f7 7.14<\/span><\/li>\r\n <li><span>mils \u2192 \u00b5m<\/span><span class=\"value\">\u00d7 25.4<\/span><\/li>\r\n <li><span>\u00b5m \u2192 mils<\/span><span class=\"value\">\u00f7 25.4<\/span><\/li>\r\n <li><span>1 lb =<\/span><span class=\"value\">0.4536 kg<\/span><\/li>\r\n <\/ul>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Important Note<\/h3>\r\n <div class=\"tip-box\">\r\n <strong>Theoretical values only<\/strong>\r\n Coating thickness specifications are minimum requirements. Actual galvanized coatings often exceed minimums by 10-30%. Steel with higher silicon\/phosphorus content produces thicker, matte gray coatings. For exact specifications, refer to the current ASTM\/ISO\/GB standard documents.\r\n <\/div>\r\n <\/div>\r\n <\/aside>\r\n <\/div>\r\n <\/div>\r\n<\/div>\r\n\r\n<script>\r\n function toggleFAQ(el) {\r\n el.parentElement.classList.toggle('open');\r\n }\r\n<\/script>\r\n<\/body>\r\n<\/html>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Galvanized Steel Coating Thickness Chart | Baowu Steel Galvanized Steel Coating Thickness Chart Complete reference guide for zinc coating specifications: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-1114","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/pages\/1114","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/comments?post=1114"}],"version-history":[{"count":8,"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/pages\/1114\/revisions"}],"predecessor-version":[{"id":1201,"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/pages\/1114\/revisions\/1201"}],"wp:attachment":[{"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/media?parent=1114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

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} }\r\n <\/style>\r\n<\/head>\r\n<body>\r\n\r\n<div class=\"page-container\">\r\n\r\n <section class=\"hero-section\">\r\n <h1>Galvanized Steel Coating Thickness Chart<\/h1>\r\n <p>Complete reference guide for zinc coating specifications: ASTM A653 G90\/Z275, ASTM A123, ISO 1461, GB\/T 13912. Convert oz\/ft\u00b2 to g\/m\u00b2 and microns instantly.<\/p>\r\n <\/section>\r\n\r\n <div class=\"breadcrumb\">\r\n <a href=\"https:\/\/baowu-steel.com\/\">Home<\/a> \u203a\r\n <a href=\"https:\/\/baowu-steel.com\/tools\/\">Tools<\/a> \u203a\r\n Galvanized Steel Coating Thickness Chart\r\n <\/div>\r\n\r\n <div class=\"content-wrapper\">\r\n <div class=\"three-col-grid\">\r\n\r\n \r\n <aside class=\"left-sidebar\">\r\n <div class=\"contact-card\">\r\n <h3>Contact Us<\/h3>\r\n <p>Get factory-direct pricing. Fast reply guaranteed.<\/p>\r\n <a href=\"mailto:sales@baowu-steel.com\" class=\"cta-btn\">Get Free Quote<\/a>\r\n <div class=\"contact-info\">\r\n <a href=\"tel:+8618764178985\"><span>\ud83d\udcde<\/span> +86 187 6417 8985<\/a>\r\n <a href=\"mailto:sales@baowu-steel.com\"><span>\u2709<\/span> sales@baowu-steel.com<\/a>\r\n <a href=\"https:\/\/wa.me\/8618764178985\" target=\"_blank\" rel=\"noopener\"><span>\ud83d\udcac<\/span> WhatsApp<\/a>\r\n <\/div>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Steel Tools<\/h3>\r\n <nav class=\"tool-links\">\r\n <a href=\"https:\/\/baowu-steel.com\/tools\/pipe-weight-calculator\/\"><span class=\"icon\">\ud83d\udccf<\/span> Steel Pipe Weight Calculator<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-plate-weight-calculator\/\"><span class=\"icon\">\ud83d\udcd0<\/span> Steel Plate Weight Calculator<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-coil-weight-calculator\/\"><span class=\"icon\">\u2699\ufe0f<\/span> Steel Coil Weight Calculator<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/galvanized-steel-coating-thickness-chart\/\" class=\"current\"><span class=\"icon\">\ud83d\udee1\ufe0f<\/span> Galvanized Steel Coating Thickness Chart<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-grade-comparison-chart\/\"><span class=\"icon\">\ud83d\udd0d<\/span> Steel Grade Comparison Chart<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/h-beam-weight-chart\/\"><span class=\"icon\">\ud83c\udfd7\ufe0f<\/span> H Beam Weight Chart<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-price-per-ton-today\/\"><span class=\"icon\">\ud83d\udcb0<\/span> Steel Price Per Ton Today<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/steel-pipe-sizes-chart\/\"><span class=\"icon\">\ud83d\udcca<\/span> Steel Pipe Sizes Chart<\/a>\r\n <a href=\"https:\/\/baowu-steel.com\/sheet-metal-gauge-chart\/\"><span class=\"icon\">\ud83d\udccb<\/span> Sheet Metal Gauge Chart<\/a>\r\n <\/nav>\r\n <\/div>\r\n <\/aside>\r\n\r\n \r\n <main class=\"main-content\">\r\n\r\n \r\n <section class=\"card\">\r\n <h2>ASTM A653 Galvanized Coating Designations<\/h2>\r\n <p class=\"desc\">ASTM A653 covers steel sheet, zinc-coated (galvanized) by the hot-dip process. Coating designations range from G01 to G360 (imperial) and Z001 to Z1100 (metric). The designation represents the minimum triple-spot total both sides coating weight.<\/p>\r\n\r\n <h3>Common Coating Designations & Thickness Equivalents<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Imperial (G)<\/th><th>Metric (Z)<\/th><th>Total oz\/ft\u00b2<\/th><th>Total g\/m\u00b2<\/th><th>Per Side oz\/ft\u00b2<\/th><th>Per Side g\/m\u00b2<\/th><th>Thickness per Side (\u00b5m)<\/th><th>Thickness per Side (mils)<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>G30<\/td><td>Z090<\/td><td>0.30<\/td><td>90<\/td><td>0.15<\/td><td>45<\/td><td>~6.3<\/td><td>~0.25<\/td><\/tr>\r\n <tr><td>G40<\/td><td>Z120<\/td><td>0.40<\/td><td>120<\/td><td>0.20<\/td><td>60<\/td><td>~8.4<\/td><td>~0.33<\/td><\/tr>\r\n <tr><td>G60<\/td><td>Z180<\/td><td>0.60<\/td><td>180<\/td><td>0.30<\/td><td>90<\/td><td>~12.6<\/td><td>~0.50<\/td><\/tr>\r\n <tr class=\"highlight\"><td>G90<\/td><td>Z275<\/td><td>0.90<\/td><td>275<\/td><td>0.45<\/td><td>137.5<\/td><td>~19.3<\/td><td>~0.76<\/td><\/tr>\r\n <tr><td>G115<\/td><td>Z350<\/td><td>1.15<\/td><td>350<\/td><td>0.575<\/td><td>175<\/td><td>~24.5<\/td><td>~0.96<\/td><\/tr>\r\n <tr><td>G140<\/td><td>Z450<\/td><td>1.40<\/td><td>450<\/td><td>0.70<\/td><td>225<\/td><td>~31.5<\/td><td>~1.24<\/td><\/tr>\r\n <tr><td>G185<\/td><td>Z550<\/td><td>1.85<\/td><td>550<\/td><td>0.925<\/td><td>275<\/td><td>~38.5<\/td><td>~1.52<\/td><\/tr>\r\n <tr><td>G210<\/td><td>Z600<\/td><td>2.10<\/td><td>600<\/td><td>1.05<\/td><td>300<\/td><td>~42.0<\/td><td>~1.65<\/td><\/tr>\r\n <tr><td>G235<\/td><td>Z700<\/td><td>2.35<\/td><td>700<\/td><td>1.175<\/td><td>350<\/td><td>~49.0<\/td><td>~1.93<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">Note: 1 oz\/ft\u00b2 = 305 g\/m\u00b2. Zinc density = 7.14 g\/cm\u00b3. Thickness calculated as: coating weight per side \u00f7 density. Actual thickness may vary \u00b110-15% due to surface roughness and steel chemistry.<\/p>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>Unit Conversion Quick Reference<\/h2>\r\n <p>Standard conversion factors for zinc coating measurements:<\/p>\r\n <div class=\"conversion-grid\">\r\n <div class=\"conversion-item\"><div class=\"num\">305<\/div><div class=\"label\">1 oz\/ft\u00b2 = 305 g\/m\u00b2<\/div><\/div>\r\n <div class=\"conversion-item\"><div class=\"num\">7.14<\/div><div class=\"label\">Zinc Density = 7.14 g\/cm\u00b3<\/div><\/div>\r\n <div class=\"conversion-item\"><div class=\"num\">1.7<\/div><div class=\"label\">1 oz\/ft\u00b2 \u2248 1.7 mils (43 \u00b5m) zinc thickness<\/div><\/div>\r\n <\/div>\r\n <h3>Conversion Formulas<\/h3>\r\n <div class=\"formula-box\">\r\n <h4>Weight to Thickness<\/h4>\r\n <code class=\"formula\">Thickness (\u00b5m) = Coating Weight (g\/m\u00b2) \u00f7 7.14<\/code>\r\n <p class=\"tip\">For single-side coating: divide total g\/m\u00b2 by 2 first.<\/p>\r\n <\/div>\r\n <div class=\"formula-box\">\r\n <h4>Imperial to Metric<\/h4>\r\n <code class=\"formula\">g\/m\u00b2 = oz\/ft\u00b2 \u00d7 305<\/code>\r\n <p class=\"tip\">Example: G90 = 0.90 oz\/ft\u00b2 = 0.90 \u00d7 305 \u2248 275 g\/m\u00b2<\/p>\r\n <\/div>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>ASTM A123 Structural Galvanizing Requirements<\/h2>\r\n <p class=\"desc\">ASTM A123 covers zinc coating (hot-dip galvanizing) on iron and steel structural shapes, plate, pipe, tubing, and wire. Minimum average coating thickness depends on material category and measured steel thickness.<\/p>\r\n\r\n <h3>Minimum Average Coating Thickness (\u00b5m) by Material Category<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Material Category<\/th><th><1.6mm<\/th><th>1.6\u20133.2mm<\/th><th>3.2\u20134.8mm<\/th><th>4.8\u20136.4mm<\/th><th>6.4\u201316.0mm<\/th><th>>16.0mm<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>Structural Shapes<\/td><td>45<\/td><td>65<\/td><td>75<\/td><td>75<\/td><td>100<\/td><td>100<\/td><\/tr>\r\n <tr><td>Strip and Bar<\/td><td>45<\/td><td>65<\/td><td>75<\/td><td>75<\/td><td>75<\/td><td>100<\/td><\/tr>\r\n <tr><td>Plate<\/td><td>45<\/td><td>65<\/td><td>75<\/td><td>75<\/td><td>75<\/td><td>100<\/td><\/tr>\r\n <tr><td>Pipe & Tubing<\/td><td>45<\/td><td>45<\/td><td>75<\/td><td>75<\/td><td>75<\/td><td>75<\/td><\/tr>\r\n <tr><td>Wire<\/td><td>35<\/td><td>50<\/td><td>60<\/td><td>65<\/td><td>80<\/td><td>80<\/td><\/tr>\r\n <tr><td>Reinforcing Bar<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><td>100<\/td><td>100<\/td><\/tr>\r\n <tr><td>Forgings & Castings<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><td>100<\/td><td>100<\/td><td>100<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">Note: ASTM A123 requires individual specimen coating thickness to be at least one coating grade below the minimum average. All coating thickness requirements are minimums; no maximum exists in the specification.<\/p>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>ISO 1461 Hot Dip Galvanizing Standard<\/h2>\r\n <p class=\"desc\">EN ISO 1461 is the European and international standard for hot-dip galvanized coatings on fabricated iron and steel articles (non-centrifuged).<\/p>\r\n\r\n <h3>Minimum Coating Thickness Requirements (Non-Centrifuged)<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Steel Thickness (mm)<\/th><th>Local Thickness Minimum (\u00b5m)<\/th><th>Average Thickness Minimum (\u00b5m)<\/th><th>Coating Mass (g\/m\u00b2)<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>\u2265 6 mm<\/td><td>70<\/td><td>85<\/td><td>505<\/td><\/tr>\r\n <tr><td>\u2265 3 mm to < 6 mm<\/td><td>55<\/td><td>70<\/td><td>395<\/td><\/tr>\r\n <tr><td>\u2265 1.5 mm to < 3 mm<\/td><td>45<\/td><td>55<\/td><td>325<\/td><\/tr>\r\n <tr><td>< 1.5 mm<\/td><td>35<\/td><td>45<\/td><td>250<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">For grit-blasted surfaces prior to galvanizing, a nominal coating thickness of 1000 g\/m\u00b2 (140 \u00b5m) can be specified for steel \u22656 mm.<\/p>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>GB\/T 13912 Chinese National Standard<\/h2>\r\n <p class=\"desc\">GB\/T 13912-2020 specifies technical requirements and test methods for hot-dip galvanized coatings on fabricated iron and steel articles (excluding continuous sheet and tube).<\/p>\r\n\r\n <h3>Coating Thickness Requirements (Non-Centrifuged)<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Steel Thickness (mm)<\/th><th>Average Thickness (\u00b5m)<\/th><th>Local Thickness Minimum (\u00b5m)<\/th><th>Coating Mass (g\/m\u00b2)<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>\u2265 6 mm<\/td><td>> 85<\/td><td>70<\/td><td>505<\/td><\/tr>\r\n <tr><td>> 3 mm to < 6 mm<\/td><td>> 70<\/td><td>55<\/td><td>395<\/td><\/tr>\r\n <tr><td>> 1.5 mm to \u2264 3 mm<\/td><td>> 55<\/td><td>45<\/td><td>325<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <h3>Centrifuged Articles (e.g., Fasteners)<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Diameter (mm)<\/th><th>Local Thickness Minimum (\u00b5m)<\/th><th>Coating Mass (g\/m\u00b2)<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>> 6 mm (threaded)<\/td><td>40<\/td><td>285<\/td><\/tr>\r\n <tr><td>\u2264 6 mm (threaded)<\/td><td>20<\/td><td>140<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">GB\/T 13912-2020 updated from 2002 version with additional terminology definitions and expanded repair requirements.<\/p>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>International Standards Comparison<\/h2>\r\n <p class=\"desc\">Comparison of common coating designations across major international standards (total both sides).<\/p>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>GB\/T 2518 (CN)<\/th><th>JIS G3302 (JP)<\/th><th>EN 10327 (EU)<\/th><th>ASTM A653 (US)<\/th><th>Total g\/m\u00b2<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>Z060<\/td><td>Z06<\/td><td>Z060<\/td><td>\u2014<\/td><td>60<\/td><\/tr>\r\n <tr><td>Z080<\/td><td>Z08<\/td><td>Z080<\/td><td>\u2014<\/td><td>80<\/td><\/tr>\r\n <tr><td>Z090<\/td><td>Z09<\/td><td>Z090<\/td><td>G30<\/td><td>90<\/td><\/tr>\r\n <tr><td>Z100<\/td><td>Z10<\/td><td>Z100<\/td><td>\u2014<\/td><td>100<\/td><\/tr>\r\n <tr><td>Z120<\/td><td>Z12<\/td><td>Z120<\/td><td>G40<\/td><td>120<\/td><\/tr>\r\n <tr class=\"highlight\"><td>Z180<\/td><td>Z18<\/td><td>Z180<\/td><td>G60<\/td><td>180<\/td><\/tr>\r\n <tr><td>Z250<\/td><td>Z25<\/td><td>Z250<\/td><td>\u2014<\/td><td>250<\/td><\/tr>\r\n <tr class=\"highlight\"><td>Z275<\/td><td>Z27<\/td><td>Z275<\/td><td>G90<\/td><td>275<\/td><\/tr>\r\n <tr><td>Z350<\/td><td>Z35<\/td><td>Z350<\/td><td>G115<\/td><td>350<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>Weight Increase Due to Zinc Coating<\/h2>\r\n <p class=\"desc\">Galvanizing adds weight to the base steel. The actual increase depends on steel thickness, shape, surface area-to-weight ratio, and coating thickness.<\/p>\r\n\r\n <h3>Typical Weight Increase by Steel Type<\/h3>\r\n <div class=\"table-container\">\r\n <table class=\"data-table\">\r\n <thead><tr><th>Coating Thickness<\/th><th>Steel Type<\/th><th>Surface Area (ft\u00b2\/ton)<\/th><th>Zinc Added (lbs)<\/th><th>Weight Increase %<\/th><\/tr><\/thead>\r\n <tbody>\r\n <tr><td>3.0 mils (1.7 oz\/ft\u00b2)<\/td><td>Light Truss<\/td><td>500<\/td><td>990<\/td><td>~2.6%<\/td><\/tr>\r\n <tr><td>4.0 mils (2.2 oz\/ft\u00b2)<\/td><td>Typical Mix Shapes<\/td><td>250<\/td><td>660<\/td><td>~1.7%<\/td><\/tr>\r\n <tr><td>5.0 mils (2.8 oz\/ft\u00b2)<\/td><td>Heavy Structural<\/td><td>100<\/td><td>330<\/td><td>~0.9%<\/td><\/tr>\r\n <tr><td>7.0 mils (3.9 oz\/ft\u00b2)<\/td><td>Reactive Steel (High Si\/P)<\/td><td>500<\/td><td>2,309<\/td><td>~6.1%<\/td><\/tr>\r\n <\/tbody>\r\n <\/table>\r\n <\/div>\r\n <p class=\"tip\">On average, the galvanized coating increases the weight of black steel by up to 15%, depending on factors including steel chemistry (silicon\/phosphorus content significantly affects coating thickness), shape, size, and surface conditions. Typical increase is 3-6% for most structural fabrications.<\/p>\r\n\r\n <h3>Coating Weight Estimation<\/h3>\r\n <div class=\"formula-box\">\r\n <h4>Quick Estimation for Pipes<\/h4>\r\n <code class=\"formula\">Galvanized Weight \u2248 Black Steel Weight \u00d7 (1 + 3% to 6%)<\/code>\r\n <p class=\"tip\">For precise calculations, use the steel coil weight calculator with galvanized density (~8.05 g\/cm\u00b3).<\/p>\r\n <\/div>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>Coating Thickness Measurement Methods<\/h2>\r\n <p class=\"desc\">Four primary methods are used to measure hot-dip galvanized coating thickness, per ASTM E376 and ISO 2178.<\/p>\r\n\r\n <h3>Measurement Techniques<\/h3>\r\n <ul>\r\n <li><strong>Magnetic Thickness Gauge (Most Common)<\/strong> \u2014 Non-destructive, measures non-magnetic coating on magnetic steel substrate. Calibration per ASTM E376. Accuracy: \u00b15% of reading.<\/li>\r\n <li><strong>Weigh-Strip-Weigh (Referee Method)<\/strong> \u2014 Sample weighed, coating stripped in inhibited acid, then re-weighed. Most accurate laboratory method.<\/li>\r\n <li><strong>Weighing Before and After Galvanizing<\/strong> \u2014 Practical for large articles; measures total zinc pickup.<\/li>\r\n <li><strong>Optical Microscopy<\/strong> \u2014 Cross-section examination; used for research and failure analysis.<\/li>\r\n <\/ul>\r\n\r\n <h3>ASTM E376 Key Points<\/h3>\r\n <ul>\r\n <li>Surface roughness can cause gauges to read high (Base Metal Reading effect).<\/li>\r\n <li>Gauges should be calibrated on uncoated substrate with similar roughness and metallurgy.<\/li>\r\n <li>Minimum 5 readings per measurement area, average reported.<\/li>\r\n <li>Electronic\/digital gauges offer best repeatability.<\/li>\r\n <\/ul>\r\n <\/section>\r\n\r\n \r\n <section class=\"card\">\r\n <h2>Frequently Asked Questions<\/h2>\r\n\r\n <div class=\"faq open\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">What does G90 coating designation mean?<\/div>\r\n <div class=\"faq-answer\">G90 is an ASTM A653 designation meaning 0.90 oz\/ft\u00b2 total zinc coating on both sides. If evenly applied, each side has 0.45 oz\/ft\u00b2 (approx. 137.5 g\/m\u00b2). Equivalent to Z275 in metric designation. The \"G\" stands for \"galvanized\".<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">How do I convert oz\/ft\u00b2 to g\/m\u00b2?<\/div>\r\n <div class=\"faq-answer\">Multiply oz\/ft\u00b2 by 305. Example: G90 = 0.90 \u00d7 305 = 274.5 g\/m\u00b2 (rounded to Z275). For single-side conversion, divide the total by 2 first. 1 oz\/ft\u00b2 \u2248 305.15 g\/m\u00b2 precisely.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">What is the difference between ASTM A653 and ASTM A123?<\/div>\r\n <div class=\"faq-answer\">ASTM A653 covers continuously hot-dip galvanized steel sheet and coil (pre-galvanized). ASTM A123 covers hot-dip galvanizing of fabricated structural steel articles (post-fabrication galvanizing). A123 coating thicknesses are generally thicker than A653 sheet coatings.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">How thick is G90 galvanizing in microns?<\/div>\r\n <div class=\"faq-answer\">G90 provides approximately 19-21 \u00b5m of zinc thickness per side. Calculation: 275 g\/m\u00b2 total \u00f7 2 = 137.5 g\/m\u00b2 per side; 137.5 \u00f7 7.14 (zinc density) \u2248 19.3 \u00b5m per side.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">What is the minimum galvanizing thickness per ISO 1461?<\/div>\r\n <div class=\"faq-answer\">ISO 1461 minimum average thickness ranges from 45 \u00b5m (for steel <1.5 mm) to 85 \u00b5m (for steel \u22656 mm). Local thickness minimums are approximately 10-15 \u00b5m lower than average requirements.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">How much weight does galvanizing add to steel?<\/div>\r\n <div class=\"faq-answer\">Typical weight increase is 3-6% for most structural fabrications. Light-gauge trusses with high surface area-to-weight ratio may see 2-3% increase, while reactive steels can add 6-10% or more. Maximum can reach 15% in extreme cases.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">What is the most common galvanized coating for sheet steel?<\/div>\r\n <div class=\"faq-answer\">G90 (Z275) is the most widely specified coating for construction and general industrial applications. G60 (Z180) is common for automotive and appliances. G40 (Z120) is used for light-duty indoor applications.<\/div>\r\n <\/div>\r\n <div class=\"faq\">\r\n <div class=\"faq-question\" onclick=\"toggleFAQ(this)\">Does GB\/T 13912 match ISO 1461?<\/div>\r\n <div class=\"faq-answer\">GB\/T 13912-2020 is technically aligned with ISO 1461, with identical coating thickness requirements for most categories. The 2020 revision harmonized terminology and measurement methods with international practice.<\/div>\r\n <\/div>\r\n <\/section>\r\n <\/main>\r\n\r\n \r\n <aside class=\"right-sidebar\">\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Coating Quick Reference<\/h3>\r\n <ul class=\"quick-ref\">\r\n <li><span>G90 (Z275) total<\/span><span class=\"value\">275 g\/m\u00b2<\/span><\/li>\r\n <li><span>G90 per side<\/span><span class=\"value\">~19 \u00b5m<\/span><\/li>\r\n <li><span>G60 (Z180) total<\/span><span class=\"value\">180 g\/m\u00b2<\/span><\/li>\r\n <li><span>G60 per side<\/span><span class=\"value\">~13 \u00b5m<\/span><\/li>\r\n <li><span>Zinc density<\/span><span class=\"value\">7.14 g\/cm\u00b3<\/span><\/li>\r\n <li><span>1 oz\/ft\u00b2 =<\/span><span class=\"value\">305 g\/m\u00b2<\/span><\/li>\r\n <li><span>1 oz\/ft\u00b2 thickness<\/span><span class=\"value\">~1.7 mils<\/span><\/li>\r\n <\/ul>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>ASTM A123 Thickness Guide<\/h3>\r\n <ul class=\"quick-ref\">\r\n <li><span>Plate >6.4mm<\/span><span class=\"value\">100 \u00b5m<\/span><\/li>\r\n <li><span>Pipe 3.2-4.8mm<\/span><span class=\"value\">75 \u00b5m<\/span><\/li>\r\n <li><span>Pipe 1.6-3.2mm<\/span><span class=\"value\">45 \u00b5m<\/span><\/li>\r\n <li><span>Structural >6.4mm<\/span><span class=\"value\">100 \u00b5m<\/span><\/li>\r\n <li><span>Wire >6.4mm<\/span><span class=\"value\">80 \u00b5m<\/span><\/li>\r\n <li><span>Rebar all sizes<\/span><span class=\"value\">100 \u00b5m<\/span><\/li>\r\n <\/ul>\r\n <p style=\"font-size:9px;color:#aaa;margin-top:4px;\">Minimum average coating thickness<\/p>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Weight Increase Guide<\/h3>\r\n <ul class=\"quick-ref\">\r\n <li><span>Light truss<\/span><span class=\"value\">~2.6%<\/span><\/li>\r\n <li><span>Typical structural<\/span><span class=\"value\">~1.7%<\/span><\/li>\r\n <li><span>Heavy structural<\/span><span class=\"value\">~0.9%<\/span><\/li>\r\n <li><span>Reactive steel<\/span><span class=\"value\">~6.1%<\/span><\/li>\r\n <li><span>Average range<\/span><span class=\"value\">3-6%<\/span><\/li>\r\n <li><span>Maximum possible<\/span><span class=\"value\">~15%<\/span><\/li>\r\n <\/ul>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Unit Conversions<\/h3>\r\n <ul class=\"quick-ref\">\r\n <li><span>oz\/ft\u00b2 \u2192 g\/m\u00b2<\/span><span class=\"value\">\u00d7 305<\/span><\/li>\r\n <li><span>g\/m\u00b2 \u2192 oz\/ft\u00b2<\/span><span class=\"value\">\u00f7 305<\/span><\/li>\r\n <li><span>g\/m\u00b2 \u2192 \u00b5m<\/span><span class=\"value\">\u00f7 7.14<\/span><\/li>\r\n <li><span>mils \u2192 \u00b5m<\/span><span class=\"value\">\u00d7 25.4<\/span><\/li>\r\n <li><span>\u00b5m \u2192 mils<\/span><span class=\"value\">\u00f7 25.4<\/span><\/li>\r\n <li><span>1 lb =<\/span><span class=\"value\">0.4536 kg<\/span><\/li>\r\n <\/ul>\r\n <\/div>\r\n\r\n <div class=\"sidebar-card\">\r\n <h3>Important Note<\/h3>\r\n <div class=\"tip-box\">\r\n <strong>Theoretical values only<\/strong>\r\n Coating thickness specifications are minimum requirements. Actual galvanized coatings often exceed minimums by 10-30%. Steel with higher silicon\/phosphorus content produces thicker, matte gray coatings. For exact specifications, refer to the current ASTM\/ISO\/GB standard documents.\r\n <\/div>\r\n <\/div>\r\n <\/aside>\r\n <\/div>\r\n <\/div>\r\n<\/div>\r\n\r\n<script>\r\n function toggleFAQ(el) {\r\n el.parentElement.classList.toggle('open');\r\n }\r\n<\/script>\r\n<\/body>\r\n<\/html>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Galvanized Steel Coating Thickness Chart | Baowu Steel Galvanized Steel Coating Thickness Chart Complete reference guide for zinc coating specifications: […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-1114","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/pages\/1114","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/comments?post=1114"}],"version-history":[{"count":8,"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/pages\/1114\/revisions"}],"predecessor-version":[{"id":1201,"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/pages\/1114\/revisions\/1201"}],"wp:attachment":[{"href":"https:\/\/baowu-steel.com\/wp-json\/wp\/v2\/media?parent=1114"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}