Hot-dip galvanized steel
Hot-dip galvanized steel S280GD in accordance with the EN 10346 standard is a high-quality structural steel that has been specially developed for use in structural engineering and building construction. With the material number 1.0244, S280GD has a minimum yield strength Rp0.2 of 280 N/mm² and thus joins the higher strength classes of galvanized structural steels. Hot-dip galvanizing in accordance with EN 10346 guarantees a uniform zinc coating on the steel surface, which effectively protects the base material against corrosion. Thanks to the various coating systems (+Z, +ZF, +ZA, +ZM, +AZ and +AS), the material can be precisely adapted to different climatic and mechanical stresses.
Production Processes of S280GD Steel
Our S280GD steel from GNEE STEEL uses a series of high-standard production processes to ensure that each batch of products can achieve the best performance and quality. The following are the main steps of our S280GD production process:
Raw material smelting: We first melt iron ore and carbon at a high temperature of about 1500°C to produce liquid steel. This is the basis of the entire production process.
Continuous casting: The liquid steel flows into the casting equipment, where it gradually cools and solidifies into a billet, which becomes the basis material for the next step of processing.
Hot rolling: The billet is heated to about 1100°C and rolled through a rolling mill to the required thickness. This process lays a solid foundation for the subsequent processing of the steel.
Cold rolling: The hot-rolled steel is quickly cooled and rolled again at room temperature to ensure that the surface of the steel is smooth and the size is accurate.
Annealing: The cold-rolled steel is heated to a temperature of 700-900°C and annealed to improve the ductility of the steel and reduce internal stress.
Galvanizing: Finally, the steel is coated with a layer of zinc at about 450°C through a hot-dip galvanizing process, which effectively improves its corrosion resistance and ensures long-term durability.
Unlike S250GD steel, S280GD uses higher rolling pressures and faster cooling rates during the production process to achieve a yield strength of 280 MPa. S250GD achieves a yield strength of 250 MPa through lower pressures and slower cooling rates.
Chemical Composition of S280GD Steel
| Element | Content (%) |
| Iron, Fe | 98-99 |
| Carbon, C | 0.1-0.2 |
| Manganese, Mn | ≤ 1.2 |
| Phosphorus, P | ≤ 0.12 |
| Sulfur, S | ≤ 0.045 |
| Silicon, Si | ≤ 0.5 |
| Nitrogen, N | ≤ 0.012 |
| Aluminum, Al | ≤ 0.015 |
Mechanical Properties of S280GD Steel
| Property | Metric | Imperial |
| Tensile Strength | 360-440 MPa | 52-64 ksi |
| Yield Strength | ≥ 280 MPa | ≥ 40.6 ksi |
| Brinell Hardness | 110-140 HB | 110-140 HB |
| Rockwell Hardness | 65-75 HRB | 65-75 HRB |
| Vickers Hardness | 120-140 HV | 120-140 HV |
| Elongation | 20-26% | 20-26% |
| Elastic Modulus | 210 GPa | 30,500 ksi |
| Fracture Elongation (≤ 0.7mm) | ≥ 16% | ≥ 16% |
| Fracture Elongation (> 0.7mm) | ≥ 18% | ≥ 18% |
| Coating Adhesion (Bend Radius) | 0T-2T (0-2x thickness) | 0T-2T (0-2x thickness) |
Available Steel Grade
| Steel grade | Coating | Yield(MPA) | Tensile(MPA) | Elongation(%) |
| DX51D | Z,ZF | -- | 270-500 | 20 |
| DX52D | Z,ZF | 140-300 | 270-420 | 22 |
| DX53D | Z,ZF | 140-260 | 270-380 | 26 |
| DX54D | Z,ZF | 140-220 | 270-350 | 30 |
| S220GD | Z,ZF | 220 | 300 | 18 |
| S250GD | Z,ZF | 250 | 330 | 17 |
| S280GD | Z,ZF | 280 | 360 | 16 |
| S320GD | Z,ZF | 320 | 390 | 15 |
| S350GD | Z,ZF | 350 | 420 | 14 |
| S400GD | Z,ZF | 400 | 470 | -- |
| S450GD | Z,ZF | 450 | 530 | -- |
| S500GD | Z,ZF | 500 | 560 | -- |
FAQ：
How thick can the zinc coating be?
Zinc coating weights typically range from Z30 to Z600 g/m² double-sided.
Is S280GD suitable for outdoor and corrosive environments?
Yes - the zinc or alloy coatings significantly improve corrosion resistance.
What are common applications of S280GD?
Applications include roofing, wall cladding, structural frames, automotive parts, appliances, and HVAC systems.
Is S280GD easy to form and fabricate?
Yes - it has good bendability and formability for cold forming and roll forming processes.
Can S280GD be welded?
Yes - it provides good weldability with proper techniques and care for the coating.
How should S280GD be stored to maintain quality?
Store in a dry, ventilated place away from moisture to preserve the coating and prevent rust.
