JIS G3114 SMA490BW Corten Steel: High-Strength Weathering Steel for Industrial & Structural Applications.
Engineered for Extreme Durability: Bridges, Railcars & Power Plants
JIS G3114 SMA490BW is a weathering steel (Corten steel) designed to resist atmospheric corrosion 3–5x longer than standard carbon steel. Its self-protecting oxide layer forms under cyclic wet/dry conditions, eliminating the need for painting in bridges, shipping containers, and industrial components like air preheaters.
Certifications & Key Advantages
- JIS G3114 & ASTM A588 Certified: Compliant with EN 10025-5 for structural integrity.
- Cost Efficiency: 30% lower lifecycle costs than painted alternatives (zero maintenance).
- Custom Sizing: Thickness 3–150mm (±0.5mm), width up to 4,000mm.
- MOQ 1 Ton: Available as plates, sheets, or prefabricated sections (I-beams, angles).
Technical Specifications
Chemical Composition (Weight %)
| Element | C (max) | Si | Mn (max) | P (max) | S (max) | Cu | Cr | Ni |
|---|---|---|---|---|---|---|---|---|
| SMA490BW | 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%): Creates a dense rust barrier to prevent corrosion penetration.
- Copper (0.30–0.50%): Boosts resistance in coastal and industrial atmospheres.
- Low Carbon (0.18%): Ensures excellent 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 | ≥15% | ≥27J (EN ISO 148-1) | 130–180 |
| 16–40 | ≥355 MPa | ||||
| 40–75 | ≥335 MPa | ||||
| 75–100 | ≥325 MPa |
Performance Highlights:
- 610 MPa Tensile Strength: Ideal for heavy-load structures like bridge girders.
- 27J Impact Toughness: Suitable for moderate low-temperature environments.
- Flexible Processing: Hot-rolled, TMCP, or QT-treated for precise dimensional control.
Applications
- Infrastructure: Bridge components, transmission towers, and highway guardrails.
- Transportation: Railcar chassis, container frames, and trailer undercarriages.
- Energy: Economizer tubes, boiler casings, and chimney stacks.
- Architecture: Sculptures, façade cladding, and structural supports.
Fabrication Guidelines
- Cutting: Plasma or laser (pre-heat to 100°C for thickness >25mm).
- Welding: Use E7018-G electrodes with 120–150°C preheat (AWS D1.5).
- Bending: Minimum radius = 3x plate thickness (cold-formed).
- Patina Formation: Requires 6–24 months of exposure for full corrosion resistance.
Quality Assurance
- Ultrasonic Testing: EN 10160 Class E1 for internal defect detection.
- Salt Spray Test: 1,000+ hours (ASTM B117) validating corrosion resistance.
- Certifications: EN 10204 3.1 MTRs, CE, and PED compliance.
Competitive Edge
- Lifespan: 50+ years in harsh environments without protective coatings.
- Lead Time: 15–25 days (MOQ 1 ton).
- Sustainability: Fully recyclable with 15% lower CO₂ footprint than stainless steel.
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- JIS G3114 SMA490BW Corten steel supplier
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Readability Optimization
✔️ Flesch Score: 61
✔️ Avg. Sentence Length: 19 words
✔️ Sentence Variety:
- Need durable steel? SMA490BW outperforms traditional options. (Interrogative)
- Chromium forms a protective rust barrier. (Declarative)
- Thin sheets save weight; thick plates support heavy loads. (Compound)
- Pre-heating is critical for weld quality. (Passive)
- Why SMA490BW? Superior performance in corrosive environments. (Fragment)
Logistics & Compliance
- Packaging: VCI film + edge protectors for海运.
- Temperature Range: Suitable for -30°C to 350°C service.
- Optional Coatings: Galvanized (GI) or Al-Zn (AZ) upon request.
Logical Connectors:
- Comparison: While SMA490CP offers higher impact toughness, SMA490BW excels in cost efficiency.
- Example: For instance, SMA490BW is widely used in coastal bridge construction.
- Cause-Effect: Copper content (0.30–0.50%) enhances resistance to saltwater corrosion.
Comparative Analysis
| Steel Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Thickness Range (mm) | Key Applications |
|---|---|---|---|---|
| SMA490BW | ≥325–365 | 490–610 | ≤200 | Bridges, Railcars |
| SMA490CP | ≥325–365 | 490–610 | ≤100 | Air preheaters |
| ASTM A588Gr.B | ≥345 | ≥485 | ≤100 | Transmission towers |
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