JIS G3114 SMA490CP Corten Steel: High-Strength Weathering Steel for Structural Integrity & Longevity.
Built for Extreme Conditions: Bridges, Railcars & Heavy Machinery
JIS G3114 SMA490CP is an advanced weathering steel (Corten steel) engineered to resist atmospheric corrosion 4–6x better than standard carbon steel. Its self-regenerating oxide layer forms under alternating wet/dry cycles, eliminating painting needs in bridges, shipping containers, and power plant components like air preheaters.
Certifications & Key Benefits
- JIS G3114 & ASTM A588 Certified: Compliant with EN 10025-5 for structural reliability.
- Cost Savings: 35% lower lifetime costs vs. painted alternatives (zero upkeep).
- Custom Sizing: 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 (max) | Mn (max) | P (max) | S (max) | Cr | Cu | Ni (max) |
|---|---|---|---|---|---|---|---|---|
| SMA490CP | 0.18 | 0.55 | 1.40 | 0.035 | 0.035 | 0.30–0.55 | 0.20–0.35 | 0.35 |
Carbon Equivalent:
Ceq=C+Mn6+(Cr+Mo+V)5+(Ni+Cu)15≤0.45%
Alloy Design:
- Chromium (0.30–0.55%): Stabilizes rust layer to prevent deep corrosion.
- Copper (0.20–0.35%): Enhances resistance in coastal/industrial environments.
- Low Carbon (0.18%): Ensures weldability (AWS D1.5 compliant).
Mechanical Properties
| Thickness (mm) | Yield Strength (Rp0.2) | Tensile Strength (Rm) | Elongation (A50) | Charpy Impact (0°C) | Hardness (HBW) |
|---|---|---|---|---|---|
| ≤16 | ≥365 MPa | 490–610 MPa | ≥21% | ≥47J (EN ISO 148-1) | 130–180 |
| 16–40 | ≥355 MPa | ||||
| 40–75 | ≥335 MPa | ||||
| 75–100 | ≥325 MPa |
Performance Highlights:
- 610 MPa Tensile Strength: 15% stronger than ASTM A588 Gr.C.
- 47J Impact Toughness: Suitable for subzero Arctic infrastructure.
- 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, façades, and rooftop support beams.
Fabrication Guidelines
- Cutting: Laser or plasma (pre-heat to 100°C for thickness >25mm).
- Welding: Use E7018-G electrodes with 120–180°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 18% 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 A588 Gr.C offers similar strength, SMA490CP has better weldability.
- Example: For instance, SMA490CP is used in marine bridge construction.
- Cause-Effect: Copper content (0.20–0.35%) enhances coastal corrosion resistance.
Comparative Analysis
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Thickness Range (mm) | Key Applications |
|---|---|---|---|---|
| SMA490CP | ≥325–365 | 490–610 | ≤100 | Bridges, Railcars |
| ASTM A588 Gr.C | ≥345 | ≥485 | ≤101.6 | Transmission towers |
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Certifications: JIS, ASTM, EN. Global delivery available.
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