JIS G3101 SS400/SS490/SS540 Carbon Steel Coil: Versatile Structural Steel for Industrial Use
Product Overview
JIS G3101 SS400/SS490/SS540 carbon steel coils are general-purpose structural steels compliant with JIS G3101, ASTM A36, and EN 10025 S235JR/S355JR. Designed for bridges, shipbuilding, and machinery frames, these grades offer 215–400 MPa yield strength with 18–23% elongation and excellent weldability. SS400 (basic grade) to SS540 (high-tensile) reduce material costs by 12–18% compared to alloy steels while maintaining structural integrity in temperatures down to -10°C.
Key Technical Specifications
1. Production & Dimensions
- Process:
- Hot-rolled: 2.75–100mm (±1.5% thickness tolerance, JIS B 0408)
- Cold-rolled: 0.2–3mm (±0.5% tolerance)
- Width: 45–2,200mm (compatible with laser cutting systems)
- Surface: Mill finish (Ra 15µm), wire-brushed (Ra 4µm), or PVC-coated (anti-corrosion)
2. Chemical Composition
| Grade | C (≤) | Mn (≤) | P (≤) | S (≤) | CEV (IIW) |
|---|---|---|---|---|---|
| SS400 | 0.30% | 0.60% | 0.050% | 0.050% | 0.25 |
| SS540 | 0.30% | 1.60% | 0.040% | 0.040% | 0.42 |
Trace elements: Cu ≤0.35%, Si ≤0.35% (SS540)
Mechanical Properties
| Grade | Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|---|
| SS400 | ≤16 | 245 | 400–510 | 21 |
| SS540 | ≤40 | 400 | 540–650 | 18 |
Tested per JIS Z 2241 (tensile) & JIS Z 2242 (Brinell hardness: 120–160 HBW)
Performance Advantages
- Cost-Effective Fabrication:
- Bend radius: 1.5× thickness (JIS B 0701 compliant).
- Welding speed: 1.1 m/min with E6013 electrodes (SS540, 12mm plate).
- Durability in Harsh Environments:
- Salt spray resistance: 500 hours (SS400 with galvanized coating).
- Suitable for coastal infrastructure like harbor cranes.
- Thermal Performance:
- Thermal expansion: 11.7 µm/m°C (20–100°C).
- Conductivity: 49 W/m·K (SS400 at 25°C).
- Impact Resistance:
- Charpy V-notch: 27J at -10°C (SS540, 25mm thickness).
Applications by Grade
| Grade | Industry | Use Case |
|---|---|---|
| SS400 | Construction | Warehouse support beams |
| SS490 | Shipbuilding | Bulkhead reinforcement |
| SS540 | Energy | Hydraulic turbine frames |
Global Equivalents
| JIS G3101 | ASTM | EN 10025 | DIN 17100 |
|---|---|---|---|
| SS400 | A36 | S235JR | St37-2 |
| SS540 | A572 Gr.50 | S355JR | St52-3 |
Sustainability & Compliance
- Recycled Content: 78% (mill-certified)
- RoHS Compliance: Chromium <0.15%, Nickel-free
- Certifications: JIS Mark, ISO 9001:2015
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Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.
