JIS G3125 SPA-C Corten Steel: High-Strength Weathering Steel for Corrosion Resistance & Structural Durability.
Engineered for Extreme Environments: Bridges, Railways & Industrial Applications
JIS G3125 SPA-C is a premium weathering steel (Corten steel) designed to resist atmospheric corrosion 4–8x better than standard carbon steel. With a unique protective oxide layer that forms under cyclic wet/dry conditions, SPA-C eliminates the need for painting in outdoor structures like bridges, railcars, and shipping containers.
Certifications & Key Advantages
- JIS G3125 & ASTM A871 Certified: Compliant with ISO 1461 for corrosion resistance.
- Cost Efficiency: 30% lower lifecycle costs vs. painted steel structures.
- Custom Sizes: Thickness 3–150mm (±0.5mm), width up to 4,000mm.
- MOQ 1 Ton: Available as plates, sheets, bars, or structural shapes (I-beams, angles).
Technical Specifications
Chemical Composition (Weight %)
| Element | C (max) | Si | Mn | P | S (max) | Cu | Cr | Ni (max) |
|---|---|---|---|---|---|---|---|---|
| SPA-C | 0.12 | 0.25–0.75 | 0.20–0.50 | 0.070–0.150 | 0.040 | 0.25–0.60 | 0.30–1.25 | 0.65 |
Alloy Design:
- Copper (0.25–0.60%): Enhances atmospheric corrosion resistance.
- Chromium (0.30–1.25%): Forms stable oxide layer to prevent rust propagation.
- Low Carbon (0.12%): Balances weldability and strength (AWS D1.1 compliant).
Mechanical Properties
| Yield Strength (Rp0.2) | Tensile Strength (Rm) | Elongation (A50) | Charpy Impact (-20°C) | Hardness (HBW) |
|---|---|---|---|---|
| ≥325 MPa | ≥450 MPa | ≥26% | ≥40J (EN ISO 148-1) | 135–180 |
Performance Highlights:
- 450 MPa Tensile Strength: 25% stronger than ASTM A588 steel.
- Self-Healing Oxide Layer: Reduces maintenance costs in coastal/industrial zones.
- Adaptable Processing: Hot-rolled, cold-rolled, or TMCP-treated for precision.
Applications
- Infrastructure: Bridges, highway guardrails, and transmission towers.
- Transportation: Railcar chassis, shipping containers, and truck trailers.
- Energy: Air preheaters, boiler economizers, and chimney stacks.
- Architecture: Sculptures, façades, and rooftop equipment supports.
Fabrication Guidelines
- Cutting: Plasma, laser, or waterjet (pre-heat to 100°C for thickness >25mm).
- Welding: Use E7018-G electrodes with 150–200°C preheat (AWS D1.1).
- Bending: Minimum radius = 2x plate thickness (cold-formed).
- Corrosion Acceleration: Initial 6–12 months of exposure required for patina formation.
Quality Assurance
- Ultrasonic Testing: EN 10160 Class E1 for internal defect detection.
- Salt Spray Test: 1,000+ hours (ASTM B117) for corrosion validation.
- Certifications: EN 10204 3.1 MTRs, CE/PED compliance.
Competitive Advantages
- Lifespan: 50+ years in moderate climates without coating.
- Lead Time: 20–30 days (MOQ 1 ton).
- Sustainability: 100% recyclable with 15% lower carbon footprint than stainless steel.
Logistics & Compliance
- Packaging: VCI-coated + edge protectors for海运.
- Temperature Limits: Suitable for -40°C to 450°C service.
- Custom Coatings: Optional galvanized (GI) or epoxy (EP) finishes.
Logical Connectors:
- Comparison: While stainless steel resists corrosion, SPA-C is more cost-effective.
- Example: For instance, SPA-C is used in coastal bridge construction.
- Cause-Effect: Chromium content (0.30–1.25%) enables self-protective patina formation.
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Certifications: JIS, ASTM, EN. Global delivery available.
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