JIS G3114 SMA490BP Corten Steel: High-Performance Weathering Steel for Industrial Durability.
Engineered for Extreme Conditions: Bridges, Railcars & Power Plants.
JIS G3114 SMA490BP is a low-alloy weathering steel designed to resist atmospheric corrosion 4–7x longer than standard carbon steel. Its self-protective oxide layer forms under cyclic wet/dry exposure, eliminating painting needs in bridges, shipping containers, and industrial components like economizers.
Certifications & Key Advantages
- JIS G3114 & ASTM A588 Gr.C Certified: Compliant with EN 10025-5 for structural integrity.
- Cost Efficiency: 40% lower lifecycle costs than painted steel (zero maintenance).
- Custom Dimensions: Thickness 3–150mm (±0.5mm), width up to 4,000mm.
- MOQ 1 Ton: Available as hot-rolled plates, cold-rolled sheets, or prefabricated sections.
Technical Specifications
Chemical Composition (Weight %)
| Element | C (max) | Si (max) | Mn (max) | P (max) | S (max) | Cr | Cu | Ni (max) |
|---|---|---|---|---|---|---|---|---|
| SMA490BP | 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 surface rust to block corrosion penetration.
- Copper (0.20–0.35%): Enhances coastal/industrial atmospheric resistance.
- Low Carbon (0.18%): Ensures superior 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) | 135–185 |
| 16–40 | ≥355 MPa | ||||
| 40–75 | ≥335 MPa | ||||
| 75–100 | ≥325 MPa | ||||
| 100–160 | ≥305 MPa | ||||
| 160–200 | ≥295 MPa |
Performance Highlights:
- 610 MPa Tensile Strength: 20% stronger than ASTM A588 Gr.C.
- 47J Impact Toughness: Suitable for Arctic infrastructure (-40°C).
- TMCP Processing: Thermomechanical control for precise thickness tolerance (±0.2mm).
Applications
- Infrastructure: Bridge girders, transmission towers, and highway guardrails.
- Transportation: Railcar chassis, container frames, and trailer undercarriages.
- Energy: Air preheater ducts, boiler casings, and chimney stacks.
- Architecture: Sculptures, façades, and rooftop support beams.
Fabrication Guidelines
- Cutting: Laser/plasma with pre-heat (120°C for >30mm thickness).
- Welding: Use E7018-G electrodes (preheat 150–200°C).
- Bending: Minimum radius = 3x thickness (cold-formed).
- Patina Formation: Achieves full corrosion resistance after 6–18 months.
Quality Assurance
- Ultrasonic Testing: EN 10160 Class E1 for internal defect detection.
- Salt Spray Test: 1,500+ hours (ASTM B117) validating corrosion resistance.
- Certifications: EN 10204 3.1 MTRs, CE, and PED compliance.
Competitive Edge
- Lifespan: 60+ years in coastal/industrial zones without coatings.
- Lead Time: 15–20 days (MOQ 1 ton).
- Sustainability: 100% recyclable with 25% lower CO₂ footprint than stainless steel.
Logistics & Compliance
- Packaging: VCI film + edge protectors for海运.
- Temperature Range: Suitable for -40°C to 450°C service.
- Custom Coatings: Galvanized (GI) or Al-Zn (AZ) upon request.
Logical Connectors:
- Comparison: While A588 Gr.C resists corrosion, SMA490BP offers higher tensile strength.
- Example: For instance, SMA490BP is used in marine bridge construction.
- Cause-Effect: Copper content (0.20–0.35%) enhances saltwater corrosion resistance.
Comparative Analysis
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Thickness Range (mm) | Key Applications |
|---|---|---|---|---|
| SMA490BP | ≥295–365 | 490–610 | ≤200 | Heavy machinery, bridges |
| ASTM A588 Gr.C | ≥345 | ≥485 | ≤101.6 | Transmission towers |
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Certifications: JIS, ASTM, EN. Worldwide shipping available.
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