What is S250GD | 1.0242?
S250GD (1.0242) is a structural steel grade under EN 10346, mainly used for galvanized steel. "S" denotes structural steel, "250" indicates the minimum yield strength in MPa, and "GD" signifies its suitability for galvanization. It contains carbon, manganese, and silicon, with stringent limits on sulfur and phosphorus. Common methods include hot-dip and electro-galvanizing, producing galvanized sheets or coils for construction, appliances, and automotive industries.
S250GD Steel Coil & Strip Welding
Welding Galvanized S250GD Steel Challenges
- Zinc Coating Effects: Zinc vaporizes at high temperatures, producing fumes that can affect weld quality.
- Porosity Risks: Zinc fumes that are trapped during welding can form gaps or cavities in the weld if not carefully controlled.
- Weakened Corrosion Protection: The heat from welding burns off the zinc layer, leaving the steel exposed to potential rust.
Welding S250GD Steel Best Practices
- Choose the Right Welding Method:
MIG/MAG (Metal Inert Gas/Metal Active Gas) Welding – Offers high efficiency and strong welds.
TIG (Tungsten Inert Gas) Welding – Ideal for precision welding with minimal spatter.
Resistance Welding – Suitable for thin galvanized sheets with minimal coating damage.
- Pre-Weld Preparation:
Remove excess zinc near the weld area using grinding or mechanical removal.
Ensure proper ventilation to minimize zinc fume exposure.
- Control Heat Input:
Use moderate heat settings to prevent excessive zinc burn-off.
Optimize welding speed to reduce heat-affected zone (HAZ) damage.
- Post-Weld Corrosion Protection:
Apply zinc-rich primers or paints to restore corrosion resistance.
Consider re-galvanization for critical structural applications.
GNEE STEEL supplies high-quality S250GD galvanized steel, ensuring compatibility with various welding and fabrication processes for construction, manufacturing, and industrial applications.
Specifications
| Quality | Standard | Material No. | Available coatings |
|---|---|---|---|
| S250GD | DIN EN 10346 | 1.0242 | +Z, +ZF, +ZA, +ZM, +AZ, +AS |
| Testing direction | Yield strengthRP02 (MPa) |
Tensil Strength Rm (MPa) |
Elongation A80 (in %) |
|---|---|---|---|
| L | ≥ 250 | ≥ 330 | ≥ 19 |
| C % |
Si % |
Mn % |
P % |
S % |
|---|---|---|---|---|
| ≤ 0,20 | ≤ 0,60 | ≤ 1,70 | ≤ 0,10 | ≤ 0,045 |
S250GD Galvanized Steel Advantages
Our S250GD galvanized steel excels in strength, durability and processability, helping customers easily meet various needs in the construction and manufacturing fields with high performance and cost-effectiveness:
High strength and good stability: S250GD guarantees a yield strength of at least 250 MPa, which can maintain structural stability under high loads, while many similar products are slightly lacking in strength.
Excellent ductility and suitable for forming: S250GD has a higher elongation after fracture than ordinary steel on the market, and is not easy to crack during the forming process, making it very suitable for complex processing.
Excellent corrosion resistance: We have optimized the galvanizing process to ensure that the steel can be used for a long time in humid or highly polluted environments, reducing corrosion losses, while other products have a relatively short service life in these environments.
Good weldability and more convenient construction: It can be easily welded without preheating, saving construction time and cost, while other materials usually require more processes.
Environmentally sustainable: S250GD has a high recycling rate and meets green manufacturing standards, making it an ideal choice for environmentally friendly projects.
|
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.
