JIS G3114 SMA570W Corten Steel: High-Strength Weathering Steel for Structural Durability & Corrosion Resistance.
Engineered for Extreme Environments: Bridges, Railcars & Industrial Infrastructure
JIS G3114 SMA570W is a premium weathering steel (Corten steel) designed to resist atmospheric corrosion 4–6x better than standard carbon steel. With a protective self-healing oxide layer that forms under cyclic weather exposure, SMA570W eliminates painting needs in bridges, shipping containers, and power plant components like air preheaters.
Certifications & Key Advantages
- JIS G3114 & ASTM A871 Certified: Complies with EN 10025 for structural integrity.
- Cost Efficiency: 40% lower lifecycle costs vs. painted steel due to zero maintenance.
- Custom Sizes: Thickness 3–150mm (±0.5mm), width up to 4,000mm.
- MOQ 1 Ton: Available as plates, sheets, or sections (H-beams, angles).
Technical Specifications
Chemical Composition (Weight %)
| Element | C (max) | Si | Mn | P (max) | S (max) | Ni | Cr | Cu |
|---|---|---|---|---|---|---|---|---|
| SMA570W | 0.18 | 0.15–0.65 | ≤1.40 | 0.035 | 0.035 | 0.05–0.30 | 0.45–0.75 | 0.30–0.50 |
Alloy Design:
- Copper (0.30–0.50%): Boosts atmospheric corrosion resistance.
- Chromium (0.45–0.75%): Forms stable rust layer to halt further oxidation.
- Low Carbon (0.18%): Enhances weldability (AWS D1.5 compliant).
Mechanical Properties
| Yield Strength (Rp0.2) | Tensile Strength (Rm) | Elongation (A50) | Charpy Impact (-20°C) | Hardness (HBW) |
|---|---|---|---|---|
| 420–460 MPa | 570–720 MPa | 19–26% | ≥27J (EN ISO 148-1) | 150–200 |
Performance Highlights:
- 720 MPa Tensile Strength: 30% stronger than conventional Corten A.
- 27J Impact Toughness: Withstands subzero temperatures in Arctic projects.
- Adaptable Processing: Hot-rolled, TMCP, or QT-treated for precision.
Applications
- Infrastructure: Bridge girders, transmission towers, and highway guardrails.
- Transportation: Railcar chassis, container walls, and truck frames.
- Energy: Air preheater tubes, boiler economizers, and chimney stacks.
- Architecture: Sculptures, façades, and rooftop support beams.
Fabrication Guidelines
- Cutting: Plasma or laser (pre-heat to 120°C for thickness >25mm).
- Welding: Use E7018-G electrodes with 100–150°C preheat (AWS D1.5).
- Bending: Minimum radius = 2x plate thickness (cold-formed).
- Patina Formation: Requires 6–18 months of outdoor exposure for full corrosion resistance.
Quality Assurance
- Ultrasonic Testing: EN 10160 Class E1 for internal defect detection.
- Salt Spray Test: 1,200+ hours (ASTM B117) for corrosion validation.
- Certifications: EN 10204 3.1 MTRs, CE, and PED compliance.
Competitive Advantages
- Lifespan: 50+ years in coastal/industrial environments without coating.
- Lead Time: 20–30 days (MOQ 1 ton).
- Sustainability: 100% recyclable with 20% lower CO₂ footprint than stainless steel.
Logistics & Compliance
- Packaging: VCI film + edge guards for海运.
- Temperature Limits: Suitable for -50°C to 400°C service.
- Custom Coatings: Optional galvanized (GI) or Al-Zn (AZ) finishes.
Logical Connectors:
- Comparison: While stainless steel resists corrosion, SMA570W is more cost-effective.
- Example: For instance, SMA570W is used in coastal bridge construction.
- Cause-Effect: Chromium content (0.45–0.75%) enables stable patina formation.
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Certifications: JIS, ASTM, EN. Global delivery available.
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