Structural-grade galvanized steel
S250GD+Z is a structural-grade galvanized steel sheet engineered for durability, corrosion resistance, and formability. This steel grade complies with rigorous standards for performance in demanding environments. The "S250" designation refers to a minimum yield strength of 250 MPa, while "GD+Z" indicates a hot-dip galvanized coating that provides robust protection against atmospheric corrosion. Combined with carefully selected surface characteristics like spangle size and coating weight, S250GD+Z galvanized steel is widely used across multiple industries requiring both strength and long-lasting finish performance.
With a tensile strength of 250 MPa, S250GD can handle significant mechanical stress. The zinc layer enhances its durability, making it suitable for outdoor applications and extending product lifespan while minimizing maintenance needs.
Chemical composition percentage of steel S250GD
| C | Si | Mn | P | S |
| max 0.2 | max 0.6 | max 1.7 | max 0.1 | max 0.045 |
Mechanical properties of steel S250GD
| Rm - Tensile strength (MPa) | 330 |
| Rp0.2 0.2% proof strength (MPa) | 250 |
| A - Min. elongation Lo = 80 mm (%) | 19 |
1) Where yield strength is defined, the values apply to the upper yield strength ReH.
2) For all steel types, with the exception of S550GD, a span of 140 MPa can be expected for the tensile strength.
3) Depending on the product thickness, the minimum values of elongation at fracture are reduced as follows: 0.50 mm < t < 0.70 mm (minus 2 units), 0.35 mm < t < 0.50 mm (minus 4 units), and t < 0.35 mm (minus 7 units).
Features
S250GD galvanized steel sheets/plates could bring the following benefits to your project:
- Strong Against Rust – The galvanized coating helps it last longer.
- Built to Last – It has great strength for heavy-duty use.
- Easy to Work With – Simple to cut, weld, and shape as needed.
- Looks Good – A smooth surface that's easy to paint, enhancing its appearance.
- Budget-Friendly – Offers great value for performance.
- Lightweight – Easy to transport and install without extra hassle.
- Eco-Friendly – Made from recyclable materials, supporting sustainability.
Applications
Construction
Roofing panels, wall cladding, structural framing, safety barriers, etc.
Automotive
Body panels, chassis components, underbody protection, reinforcements, etc.
Appliances
Washing machine housings, refrigerator panels, microwave oven shells, air conditioning casings, etc.
Electrical
Cable trays, electrical enclosures, transformer housings, conduit fittings, etc.
Agriculture
Grain storage bins, livestock enclosures, greenhouse structures, irrigation equipment, etc.
Furniture
Office partitions, shelving units, metal cabinets, bed frames, etc
Galvanized Surface Selection
|
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 |
- Zinc Thickness
| Zinc Coating Grade | Zinc Coating (g/m²) | Corrosion Resistance | Typical Applications | Remarks |
| Z30 | 30 | Very low | Indoor parts, home appliance inner panels, ventilation ducts | Not suitable for outdoor use |
| Z60 | 60 |
Low |
Indoor structures, temporary facilities | Low cost |
| Z80 | 80 | Medium | Light steel structures, base metal for PPGI | Good cost performance |
| Z100 | 100 | Medium | PPGI, fencing, general construction
|
Common export grade |
| Z120 | 120 | Medium-High |
|
Longer service life |
| Z140 | 140 | Medium-High | Industrial buildings, agricultural facilities | Suitable for outdoor use |
| Z180 | 180 | High | Long-term outdoor structures, equipment housings
|
Recommended for outdoor use |
| Z200 | 200 | Very high | Humid environments, heavy structures
|
Higher cost |
| Z275 | 275 | Excellent
|
Coastal areas, solar mounting systems, high-corrosion environments | High standard |
Our company also manufactures other products related to galvanized steel grades:
|
Standard |
Grade |
C |
Si |
Mn |
P |
S |
Ti |
|
Forcold Forming Chinese 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 Forming Japanese Standard |
SGCC |
0.15 |
0.50 |
0.80 |
0.050 |
0.030 |
0.025 |
|
SGCD1 |
0.12 |
0.50 |
0.60 |
0.040 |
0.030 |
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 Structure Japanese Standard |
SGC340 |
0.25 |
0.50 |
1.70 |
0.200 |
0.035 |
0.025 |
|
SGC400 |
0.25 |
0.50 |
1.70 |
0.200 |
0.035 |
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 Structure AISI 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 |
