Galvanized steel coil is a composite steel product manufactured by applying a pure zinc coating to a cold-rolled or hot-rolled steel substrate through a continuous hot-dip galvanizing process, providing excellent corrosion resistance. It is widely used in roofing, appliances, automotive manufacturing, and ventilation ducts.
| Product Parameters | |||||||
| Product Name | Galvanized Steel Coil | ||||||
| Thickness | 0.12mm-3.5mm | ||||||
| Width | 600mm-1500mm | ||||||
| Length | 508mm/610mm, customization available | ||||||
| Standard | AISI,ASTM,DIN,JIS,GB,JIS,SUS,EN etc. | ||||||
| Zinc Coating | Hot-dip galvanizing: 60-275g/m² Pre-galvanizing: 80-275g/m² | ||||||
| Surface Treatment Type | Chromic acid treatment, chromic acid treatment + oiling, phosphoric acid treatment (including sealing), phosphoric acid treatment (including sealing) + oiling, phosphoric acid treatment (excluding sealing), phosphoric acid treatment (excluding sealing) + oiling, oiling | ||||||
| Chemical Composition | |||||||
| Standards | Grade | C | Si | Mn | P | S | Ti |
| For Cold Forming - Chinese Standard | DX51D+Z | 0.12 | 0.5 | 0.6 | 0.1 | 0.045 | 0.3 |
| DX52D+Z | 0.12 | 0.5 | 0.6 | 0.1 | 0.045 | 0.3 | |
| DX53D+Z | 0.12 | 0.5 | 0.6 | 0.1 | 0.045 | 0.3 | |
| DX54D+Z | 0.12 | 0.5 | 0.6 | 0.1 | 0.045 | 0.3 | |
| DX56D+Z | 0.12 | 0.5 | 0.6 | 0.1 | 0.045 | 0.3 | |
| DX57D+Z | 0.12 | 0.5 | 0.6 | 0.1 | 0.045 | 0.3 | |
| For Cold Forming - Japanese Standard | SGCC | 0.15 | 0.5 | 0.8 | 0.05 | 0.03 | 0.025 |
| SGCD1 | 0.12 | 0.5 | 0.6 | 0.04 | 0.03 | 0.025 | |
| SGCD2 | 0.1 | 0.5 | 0.45 | 0.03 | 0.03 | 0.025 | |
| SGCD3 | 0.08 | 0.5 | 0.45 | 0.03 | 0.03 | 0.025 | |
| SGCD4 | 0.06 | 0.5 | 0.45 | 0.03 | 0.03 | 0.025 | |
| For Structural Applications - Japanese Standard | SGC340 | 0.25 | 0.5 | 1.7 | 0.2 | 0.035 | 0.025 |
| SGC400 | 0.25 | 0.5 | 1.7 | 0.2 | 0.035 | 0.15 | |
| SGC440 | 0.25 | 0.5 | 2 | 0.2 | 0.035 | 0.15 | |
| SGC490 | 0.3 | 0.5 | 2 | 0.2 | 0.035 | 0.025 | |
| SGC510 | 0.3 | 0.5 | 2.5 | 0.2 | 0.035 | 0.025 | |
| For Structural Applications - AISI Standard | S220GD+Z | 0.2 | 0.6 | 0.7 | 0.1 | 0.045 | 0.025 |
| S250GD+Z | 0.2 | 0.6 | 0.7 | 0.1 | 0.045 | 0.025 | |
| S280GD+Z | 0.2 | 0.6 | 0.7 | 0.1 | 0.045 | 0.025 | |
| S320GD+Z | 0.2 | 0.6 | 0.7 | 0.1 | 0.045 | 0.025 | |
| S350GD+Z | 0.2 | 0.6 | 0.7 | 0.1 | 0.045 | 0.15 | |
| S550GD+Z | 0.2 | 0.6 | 0.7 | 0.1 | 0.045 | 0.15 | |
| Mechanical properties | |||||||
| Grade | Yield strength (MPa) ≥ | Tensile strength (MPa) ≥ | Elongation (A%) ≥ | ||||
| DX51D+Z/ZM/AZ/AM | 240-380 | 270-500 | 22 | ||||
| DX52D+Z/ZM/AZ/AM | 140-300 | 270-420 | 26 | ||||
| DX53D+Z/ZM/AZ/AM | 140-260 | 270-380 | 30 | ||||
| DX54D+Z/ZM/AZ/AM | 120-220 | 260-350 | 36 | ||||
| S220GD+Z/ZM/AM | 220 | 300 | 20 | ||||
| S250GD+Z/ZM/AZ/AM | 250 | 330 | 19 | ||||
| S280GD+Z/ZM/AM | 280 | 360 | 18 | ||||
| S300GD+AZ/AM | 300 | 380 | 18 | ||||
| S320GD+Z/ZM/AM | 320 | 390 | 17 | ||||
| S350GD+Z/ZM/AZ/AM | 350 | 420 | 16 | ||||
| S450GD+AZ/AM | 450 | 480 | 15 | ||||
| S550GD+Z/ZM/AZ/AM | 550 | 550 | － | ||||
| Zinc plating surface selection | |||||||
| Zero zinc spangle, | small zinc spangle | normal zinc spangle | large zinc spangle | ||||
 |
|||||||
| Material comparison | |||||||
| Chinese standards | Japanese standards | European standards | |||||
| DX51D+Z/DC51D+Z (CR) | SGCC | DX51D+Z | |||||
| DX52D+Z/DC52D+Z | SGCD1 | DX52D+Z | |||||
| DX53D+Z/DC53D+Z/DX54D+Z/DC54D+Z | SGCD2/SGCD3 | DX53D+Z/DX54D+Z | |||||
| S220/250/280/320/350/550GD+Z | SGC340/400/440/490/570 | S220/250/280/320/350GD+Z | |||||
| DX51D+Z/DD51D+Z (HR) | SGHC | DX51D+Z | |||||
China United Steel
