JIS G3114 SMA490AP Corten Steel: Advanced Weathering Steel for Industrial & Structural Longevity.
Engineered for Corrosion Resistance: Bridges, Railcars & Power Infrastructure.
JIS G3114 SMA490AP is a low-alloy high-strength weathering steel designed to withstand atmospheric corrosion 4–8x longer than conventional carbon steel. Its self-protective rust layer forms naturally under cyclic wet/dry exposure, eliminating painting requirements for bridges, shipping containers, and power plant components like economizers.
Certifications & Key Advantages
- JIS G3114 & ASTM A588 Gr.C Certified: Compliant with EN 10025-5 for structural reliability.
- Cost Efficiency: 35% lower lifecycle costs vs. painted alternatives (zero maintenance).
- Custom Sizing: 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) |
|---|---|---|---|---|---|---|---|---|
| SMA490AP | 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%
Ensures superior weldability (AWS D1.5 compliant).
Alloy Design:
- Chromium (0.30–0.55%): Stabilizes surface rust to block corrosion penetration.
- Copper (0.20–0.35%): Enhances resistance to coastal/industrial atmospheres.
- Low Carbon (0.18%): Reduces cracking risk during welding.
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 | ≥15% | ≥27J (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: 18% stronger than ASTM A588 Gr.C.
- 27J Impact Toughness: Suitable for moderate low-temperature environments (-20°C).
- Precision Processing: Hot-rolled, TMCP, or QT-treated for ±0.2mm thickness tolerance.
Applications
- Infrastructure: Bridge girders, transmission towers, and highway guardrails.
- Transportation: Railcar underframes, container walls, and trailer chassis.
- 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 plate 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: 1,200+ hours (ASTM B117) validating corrosion resistance.
- Certifications: EN 10204 3.1 MTRs, CE, and PED compliance.
Competitive Edge
- Lifespan: 55+ years in coastal/industrial zones without coatings.
- Lead Time: 15–25 days (MOQ 1 ton).
- Sustainability: 100% recyclable with 20% lower CO₂ footprint than stainless steel.
Logistics & Compliance
- Packaging: VCI film + edge protectors for.
- Temperature Range: Suitable for -25°C to 400°C service.
- Optional Coatings: Galvanized (GI) or Al-Zn (AZ) upon request.
Comparative Analysis
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Thickness Range (mm) | Key Applications |
|---|---|---|---|---|
| SMA490AP | ≥295–365 | 490–610 | ≤200 | Bridges, Heavy machinery |
| 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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