Gnee Steel is a leading manufacturer and supplier of ASME SA588 / SA588M Grade C High-Strength Low-Alloy (HSLA) Structural Steel Plates in China.
Our steel plates are designed to combine high strength, exceptional toughness, and atmospheric corrosion resistance, making them ideal for construction, infrastructure, and heavy-duty industrial applications.
Production Size and Capacity
| Dimension | Range |
|---|---|
| Thickness | 4mm – 400mm |
| Width | 1000mm – 4000mm |
| Length | 4000mm – 12000mm |
| Monthly Output | 10,000 tons |
| Production Process | Hot Rolled |
Our large production capability ensures consistent supply for projects of any scale, from small industrial structures to large-scale bridge or vehicle fabrication projects.
Chemical Composition (%)
The chemical composition of SA588 Grade C / GrC is carefully controlled to achieve optimal strength, toughness, and corrosion resistance:
| Element | Composition (%) | Notes |
|---|---|---|
| Carbon (C) | ≤ 0.15 | Low carbon content ensures excellent weldability and toughness. |
| Manganese (Mn) | 0.80 – 1.35 | Enhances strength and hardenability. |
| Silicon (Si) | 0.15 – 0.40 | Acts as a deoxidizer and slightly improves strength. |
| Phosphorus (P) | ≤ 0.04 | Low P prevents embrittlement. |
| Sulfur (S) | ≤ 0.05 | Low S ensures ductility and weld quality. |
Note: Trace elements such as Nb, V, and Ti may be added in some batches for microalloying, improving grain refinement and low-temperature toughness.
Mechanical Properties
| Property | SA588 Grade C / GrC | Standard Reference |
|---|---|---|
| Yield Strength | ≥ 345 MPa | ASME SA588 |
| Tensile Strength | ≥ 485 MPa | ASME SA588 |
| Elongation | ≥ 21% | ASME SA588 |
| Charpy V-Notch Impact Energy | 27 J @ -20°C | Optional per project requirements |
| Hardness | 120–180 HB | Depends on thickness and heat treatment |
Data Highlight: Compared with standard mild steel (ASTM A36, yield 250 MPa), SA588 Grade C exhibits 38% higher yield strength and superior toughness, reducing steel consumption in structural designs.
Heat Treatment Options
Normalized – Refines microstructure for uniform mechanical properties.
Quenched and Tempered – Optional for applications requiring higher tensile strength.
HIC / Impact Tests – Ensures resistance to cracking in demanding conditions.
Gnee can provide customized heat treatment to match project-specific performance requirements.
Applications
SA588 Grade C / GrC plates are widely used in sectors where strength, durability, and corrosion resistance are critical:
Bridges, viaducts, and overpasses
Marine and offshore structures
Pressure vessels and storage tanks
Railway wagons and vehicle chassis
Towers, frames, and heavy-duty industrial equipment
Case Study Example: A bridge project in Guangdong used 500 tons of SA588 GrC plates, achieving a 40% reduction in steel weight compared to conventional mild steel, while maintaining the same structural safety margin.
Advantages of Gnee SA588 GrC Steel
High Strength & Toughness: Supports heavy loads while resisting brittle fracture.
Weather Resistance: Naturally forms a thin oxide layer, reducing atmospheric corrosion by 30–50% compared to mild steel.
Cost-Effective: Eliminates the need for frequent painting or maintenance.
Versatile Fabrication: Suitable for welding, bolting, cutting, and machining.
Custom Sizes & Processing: Gnee can supply plates in customized dimensions and with optional perforation, bending, or cutting for specific projects.
