The coating designation G40 represents the type of coating and the weight of the applied coating. The letter "G" indicates that the coating is galvanized, meaning zinc-based. Meanwhile, the number "40" represents the thickness of zinc on the surface of the steel coil. Galvanized steel coil is covered with a zinc coating to provide corrosion resistance. The G40 protective coating prevents moisture from reaching the steel structure, thereby improving the corrosion resistance of the steel. This can extend the life expectancy of the steel. G40 is the average coat weight and therefore provides moderate protection.
Scope of Application
Galvanizing products are widely used in industry, agriculture, animal husbandry and fishery, energy, transportation, chemical industry, light industry, home appliances, construction, communications, national defense and other fields.
Product Parameters
| Product Name | G40 Galvanized Coil |
| Thickness | 0.12mm-3.5mm |
| Width | 600mm-1500mm |
| Length | 508mm/610mm, Support Customization |
| Standard | AISI, ASTM, DIN, JIS, GB, JIS, SUS, EN, etc. |
| Zinc Layer | Hot Galvanizing: 60-275g/m² |
| Pre-galvanized: 80-275g/m² |
Chemical Composition
| Standard | Grade | C | Si | Mn | P | S | Ti |
| Forcold FormingChinese Standard | DX51D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
| DX52D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
| DX53D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
| DX54D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
| DX56D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
| DX57D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
| Forcold FormingJapanese Standard | SGCC | 0.15 | 0.50 | 0.80 | 0.050 | 0.030 | 0.025 |
SGCD1
SGCD2 | 0.12
0.10 | 0.50
0.50 | 0.60
0.45 | 0.040
0.030 | 0.030
0.030 | 0.025
0.025 |
| SGCD3 | 0.08 | 0.50 | 0.45 | 0.030 | 0.030 | 0.025 |
| SGCD4 | 0.06 | 0.50 | 0.45 | 0.030 | 0.030 | 0.025 |
| For StructureJapanese Standard | SGC340 | 0.25 | 0.50 | 1.70 | 0.200 | 0.035 | 0.025 |
SGC400
SGC440 | 0.25
0.25 | 0.50
0.50 | 1.70
2.00 | 0.200
0.200 | 0.035
0.035 | 0.150
0.150 |
| SGC490 | 0.30 | 0.50 | 2.00 | 0.200 | 0.035 | 0.025 |
| SGC510 | 0.30 | 0.50 | 2.50 | 0.200 | 0.035 | 0.025 |
| For StructureAISI Standard | S220GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.025 |
| S250GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.025 |
| S280GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.025 |
| S320GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.025 |
| S350GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.150 |
| S550GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.150 |
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 A/AM | 300 | 380 | 18 |
| S320GD Z/ZM/AM | 320 | 390 | 17 |
| S350GD Z/ZM/AZ/AM | 350 | 420 | 16 |
| S450GD A/AM | 450 | 480 | 15 |
| S550GD Z/ZM/AZ/AM | 550 | 550 | - |
Galvanized Surface Selection
| Zero Spangle | Minimized Spangle | Normal Spangle | Large Spangle |
 |  |  |  |
| Use of The Environment | Recommended Zinc Thickness |
| Indoor Use | Z10 or Z12 (100g/㎡or 120g/㎡) |
| Suburbs | Z20 and Painting (200g/㎡) |
| Urban or Industrial Area | Z27 (270g/㎡) or G90 (US Standard) and painted |
| Coastal Area | Thicker than Z27 (270g/㎡) or G90 (US Standard) and painted |
| Punch or Deep Drawing Application | Thicker than Z27 (270grams/㎡) or G90 (US Standard) avoid coating peeling after stamping |
| Surface Treatment Type | Code | Features |
| Chromic Acid Treatment | C | Good corrosion resistance, suitable for bare state |
| Chromic Acid Treatment+Oiling | S | Good corrosion resistance |
| Phosphoric Acid Treatment (Including Sealing Treatment) | P | Have a certain corrosion resistance, good paint performance |
| Phosphoric Acid Treatment (Including Sealing Treatment)+Oiling | Q | Has a certain corrosion resistance, good paint performance, prevent rust during transportation and storage |
| Phosphoric Acid Treatment (Excluding Sealing Treatment) | T | Have a certain corrosion resistance, good paint performance |
| Phosphoric Acid Treatment (Excluding Sealing Treatment)+Oiling | V | Has a certain corrosion resistance, good paint performance, and prevent rust |
| Oiling | O | Prevent rust during transportation and storage |
| No Treatment | M | Suitable for immediate painting |
Material Comparison
| Chinese Standard | Japan Standard | European Standard |
| DX51D Z/DC51D Z (CR) | SGCC | DX51D Z |
| DX52D Z/DC52D Z | SGCD1 | DX52D With |
| 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 |
Stainless Steel Plate
304L Stainless Steel Plate
C-Shaped Steel
H-Beam
Z-Beam
