JIS G3114 SMA490CW Corten Steel: High-Performance Weathering Steel for Structural Durability & Cost Efficiency.
Built for Harsh Environments: Bridges, Railcars & Industrial Machinery
JIS G3114 SMA490CW is a weathering steel (Corten steel) engineered to resist atmospheric corrosion 3–5x better than standard carbon steel. Its self-regenerating oxide layer forms under wet/dry cycles, eliminating painting needs in bridges, shipping containers, and power plant components like economizers.
Certifications & Core Benefits
- JIS G3114 & ASTM A588 Certified: Complies with EN 10025-5 for structural reliability.
- Cost Savings: 30% lower lifetime costs vs. painted alternatives due to zero upkeep.
- Custom Dimensions: Thickness 3–150mm (±0.5mm), width up to 4,000mm.
- MOQ 1 Ton: Available as plates, sheets, or structural sections (H-beams, channels).
Technical Specifications
Chemical Composition (Weight %)
| Element | C (max) | Si | Mn (max) | P (max) | S (max) | Cu | Cr | Ni |
|---|---|---|---|---|---|---|---|---|
| SMA490CW | 0.18 | 0.15–0.65 | 1.40 | 0.035 | 0.035 | 0.30–0.50 | 0.45–0.75 | 0.05–0.30 |
Alloy Design:
- Chromium (0.45–0.75%): Forms a stable rust barrier to halt corrosion spread.
- Copper (0.30–0.50%): Enhances resistance in coastal/industrial zones.
- Low Carbon (0.18%): Optimizes weldability (AWS D1.5 compliant).
Mechanical Properties
| Yield Strength (Rp0.2) | Tensile Strength (Rm) | Elongation (A50) | Charpy Impact (0°C) | Hardness (HBW) |
|---|---|---|---|---|
| ≥365 MPa | 490–610 MPa | ≥21% | ≥47J (EN ISO 148-1) | 140–190 |
Performance Highlights:
- 610 MPa Tensile Strength: 15% stronger than SMA480CW variants.
- 47J 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 signposts.
- Transportation: Railcar underframes, container walls, and trailer chassis.
- Energy: Air preheater ducts, boiler casings, and chimney liners.
- Architecture: Sculptures, sunshades, and rooftop support beams.
Fabrication Guidelines
- Cutting: Laser or plasma (pre-heat to 120°C for thickness >30mm).
- Welding: Use E7018-G electrodes with 150–200°C preheat (AWS D1.5).
- Bending: Minimum radius = 3x plate thickness (cold-formed).
- Patina Development: Requires 6–18 months of exposure for full corrosion resistance.
Quality Assurance
- Ultrasonic Testing: EN 10160 Class E1 for defect-free consistency.
- Salt Spray Test: 1,200+ hours (ASTM B117) validating corrosion performance.
- Certifications: EN 10204 3.1 MTRs, CE, and PED compliance.
Competitive Edge
- Lifespan: 50+ years in coastal/industrial environments without coatings.
- Lead Time: 15–25 days (MOQ 1 ton).
- Sustainability: 100% recyclable with 20% lower CO₂ emissions than stainless steel.
Logistics & Compliance
- Packaging: VCI film + edge guards for海运.
- Temperature Limits: Suitable for -40°C to 400°C service.
- Custom Coatings: Optional galvanized (GI) or Al-Zn (AZ) finishes.
Logical Connectors:
- Comparison: While A588Gr.B resists corrosion, SMA490CW offers higher yield strength.
- Example: For instance, SMA490CW is used in marine bridge construction.
- Cause-Effect: Copper content (0.30–0.50%) enhances coastal corrosion resistance.
Comparative Analysis
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Thickness Range (mm) | Key Applications |
|---|---|---|---|---|
| SMA490CW | ≥365 | 490–610 | ≤160 | Bridges, Railcars |
| SMA480CW | ≥365 | 490–610 | ≤16 | Light structural frames |
| ASTM A588Gr.B | ≥345 | ≥485 | ≤100 | Transmission towers |
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Certifications: JIS, ASTM, EN. Global delivery available.
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