S250GD Galvanized Steel
S250GD is characterized by a balanced combination of strength, ductility and corrosion resistance. The minimum yield strength Rp0.2 of 250 N/mm² and a tensile strength in the range of 360-510 N/mm² guarantee a reliable load-bearing capacity with sufficient ductility. Thanks to the hot-dip galvanized surface, the steel achieves long-lasting corrosion protection, making it resistant even in aggressive climates and industrial environments.
Hot-dip galvanized steel S250GD in accordance with the EN 10346 standard is a high-quality structural steel that has been specially developed for use in the construction industry. With the material number 1.0242, S250GD has a minimum yield strength Rp0.2 of 250 N/mm² and is therefore classified in the medium strength classes of hot-dip galvanized structural steels. The EN 10346 standard not only specifies the chemical composition and mechanical properties, but also defines the hot-dip galvanizing process that creates a uniformly protective zinc coating on the steel surface. The available coatings +Z, +ZF, +ZA, +ZM, +AZ and +AS enable precise adaptation to different environmental conditions and load scenarios.
Surface Finish & Spangle Options
GNEE STEEL provides a range of spangle finishes and surface treatments for S250GD galvanized steel, offering versatility for various applications.
Spangle Types:
Spangle refers to the crystalline structure that forms on the surface of galvanized steel. The spangle finish influences both the aesthetics and functional properties of the material:
| Spangle Type | Description |
| Normal Spangle | Traditional, large crystalline spangle with visible metallic sheen. |
| Skinpassed Spangle | A smooth, uniform spangle with reduced surface texture, offering a more polished appearance. |
| Minimized Spangle | A subtle spangle with minimal crystalline formation, ideal for more refined aesthetics. |
| Regular Spangle | Balanced spangle appearance with consistent texture, suitable for general use. |
Surface Treatments:
In addition to spangle options, we offer various surface treatments to enhance the material's properties:
| Surface Treatment | Description |
| Chromate Passivation | A corrosion-resistant chromate passivation layer for enhanced durability and weather resistance. |
| Oiled | A light oil coating applied to prevent corrosion and maintain surface integrity during storage and handling. |
| Uncoated | No additional surface coating, ideal for applications where a natural galvanized finish is desired. |
DIN S250GD + Z DIN Mechanical properties
| Yield Rp0.2 (MPa) |
Tensile Rm (MPa) |
Impact KV/Ku (J) |
Elongation A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | Brinell hardness (HBW) |
|---|---|---|---|---|---|---|
| 998 (≥) | 825 (≥) | 11 | 14 | 14 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 122 |
DIN S250GD + Z DIN Physical properties
The DIN S250GD + Z DIN material physical properties shall comply with the values given in the following table.
| Temperature (°C) |
Modulus of elasticity (GPa) |
Mean coefficient of thermal expansion 10-6/(°C) between 20(°C) and | Thermal conductivity (W/m·°C) |
Specific thermal capacity (J/kg·°C) |
Specific electrical resistivity (Ω mm²/m) |
Density (kg/dm³) |
Poisson's coefficient, ν |
|---|---|---|---|---|---|---|---|
| 42 | - | - | 0.14 | - | |||
| 499 | 398 | - | 24.3 | 421 | - | ||
| 341 | - | 11 | 21.2 | 434 | 221 |
|
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 |
Frequently Asked Questions (FAQ)
Q: What is S250GD steel?
A: S250GD steel is a galvanized steel known for its strength and durability. Due to its high yield strength and excellent corrosion resistance, it is commonly used in construction and manufacturing.
Q: What are the typical applications of S250GD galvanized coil?
A: S250GD galvanized coil is widely used in roofing, construction, automotive parts, and as a raw material for making galvanized steel plates, sheets, and pipes. Its resistance to corrosion makes it ideal for outdoor applications.
Q: How does the galvanizing process enhance the properties of S250GD steel?
A: The galvanizing process involves coating the steel with a zinc layer, providing a protective barrier against corrosion. This process enhances the durability and longevity of S250GD steel, making it suitable for various applications.
Q: What is the chemical composition of S250GD steel?
A: The chemical composition of S250GD steel typically includes carbon, manganese, phosphorus, sulfur, and a zinc coating. The specific composition balances strength, ductility, and corrosion resistance.
Q: What is the minimum yield strength of S250GD steel?
A: The minimum yield strength of S250GD steel is 250 MPa. This property ensures the steel can withstand significant stress and strain without deforming, making it a reliable choice for structural applications.
