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Hot-dip galvanized steel sheet is made by immersing cold-rolled or hot-rolled steel sheet in molten zinc, forming a zinc-iron alloy coating on the surface. It is mainly used for structural and decorative components requiring corrosion resistance. Standards for galvanized steel sheet specify that the coating weight must be determined based on the application scenario. For general corrosion protection, the coating weight should not be less than 120g/m², while for highly corrosive environments such as marine climates, the coating weight should not be less than 275g/m².The base material for galvanized steel sheet is mostly cold-rolled or hot-rolled steel sheet. Cold-rolled base material has a thickness range of 0.2mm-4.0mm, high surface flatness, and can be used for appliance casings, decorative panels, etc. Hot-rolled base material has a thickness of 2.0mm-12.0mm, high strength, and is suitable for load-bearing applications such as steel structures and railings.The coating of galvanized steel sheet consists of a pure zinc layer, a zinc-iron alloy layer, and a transition layer from the outside to the inside. The pure zinc layer accounts for 60%-70% of the total coating thickness and provides the main anti-corrosion capability. The zinc-iron alloy layer accounts for 20%-30% of the thickness and enhances the adhesion between the coating and the substrate, so that the coating does not peel off during long-term use.
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Standards/Zinc Coating Representation Methods for Galvanized Sheets |
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Standard Category |
National Standard GB/T2518-2004 |
Japanese Standard JIS G3302 |
European Standard EN10327 |
American standard ASTM A653M |
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Metric |
Imperial |
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Zinc layer |
Z001 |
G01 |
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Z60 |
Z060 |
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Z80 |
Z08 |
Z080 |
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Z90 |
G30 |
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Z100 |
Z10 |
Z100 |
Z100 |
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Z120 |
Z12 |
Z120 |
Z120 |
G40 |
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Z180 |
Z18 |
Z180 |
Z180 |
G60 |
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Z250 |
Z25 |
Z250 |
Z250 |
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Z275 |
Z27 |
Z275 |
Z275 |
G90 |
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Z350 |
Z35 |
Z350 |
Z350 |
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And so on. |
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Brand |
2 |
SGCC |
DX51D+Z |
CSTypeA/B/C |
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3 |
SGCD |
DX52D+Z |
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European standard EN10327 has replaced EN10142; |
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The corresponding grades for European standard EN10326 are: S280GD+Z, S320GD+Z… |
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Neutral packaging shall comply with the standard marked JIS G3302-SGCC; |
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