SPA-C Corten steel plate

JIS G3125 SPA-C Corten Steel: High-Strength Weathering Steel for Corrosion Resistance & Structural Durability‌ ‌Engineered for Extreme Environments: Bridges, Railways & Industrial Applications‌ JIS G3125 SPA-C is a premium ‌weathering steel‌ (Corten steel) designed to resist atmospheric corrosion 4–8x better than standard carbon steel. With a unique ‌protective oxide layer‌ that forms under cyclic wet/dry conditions, SPA-C eliminates the need for painting in outdoor structures like bridges, railcars, and shipping containers.
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Product Introduction

JIS G3125 SPA-C Corten Steel: High-Strength Weathering Steel for Corrosion Resistance & Structural Durability‌.

‌Engineered for Extreme Environments: Bridges, Railways & Industrial Applications‌

JIS G3125 SPA-C is a premium ‌weathering steel‌ (Corten steel) designed to resist atmospheric corrosion 4–8x better than standard carbon steel. With a unique ‌protective oxide layer‌ that forms under cyclic wet/dry conditions, SPA-C eliminates the need for painting in outdoor structures like bridges, railcars, and shipping containers.


‌Certifications & Key Advantages‌

  • ‌JIS G3125 & ASTM A871 Certified‌: Compliant with ISO 1461 for corrosion resistance.
  • ‌Cost Efficiency‌: 30% lower lifecycle costs vs. painted steel structures.
  • ‌Custom Sizes‌: Thickness 3–150mm (±0.5mm), width up to 4,000mm.
  • ‌MOQ 1 Ton‌: Available as plates, sheets, bars, or structural shapes (I-beams, angles).

‌Technical Specifications‌

‌Chemical Composition (Weight %)‌

Element C (max) Si Mn P S (max) Cu Cr Ni (max)
SPA-C 0.12 0.25–0.75 0.20–0.50 0.070–0.150 0.040 0.25–0.60 0.30–1.25 0.65

‌Alloy Design‌:

  • ‌Copper (0.25–0.60%)‌: Enhances atmospheric corrosion resistance.
  • ‌Chromium (0.30–1.25%)‌: Forms stable oxide layer to prevent rust propagation.
  • ‌Low Carbon (0.12%)‌: Balances weldability and strength (AWS D1.1 compliant).

‌Mechanical Properties‌

Yield Strength (Rp0.2) Tensile Strength (Rm) Elongation (A50) Charpy Impact (-20°C) Hardness (HBW)
≥325 MPa ≥450 MPa ≥26% ≥40J (EN ISO 148-1) 135–180

‌Performance Highlights‌:

  • ‌450 MPa Tensile Strength‌: 25% stronger than ASTM A588 steel.
  • ‌Self-Healing Oxide Layer‌: Reduces maintenance costs in coastal/industrial zones.
  • ‌Adaptable Processing‌: Hot-rolled, cold-rolled, or TMCP-treated for precision.

‌Applications‌

  1. ‌Infrastructure‌: Bridges, highway guardrails, and transmission towers.
  2. ‌Transportation‌: Railcar chassis, shipping containers, and truck trailers.
  3. ‌Energy‌: Air preheaters, boiler economizers, and chimney stacks.
  4. ‌Architecture‌: Sculptures, façades, and rooftop equipment supports.

‌Fabrication Guidelines‌

  • ‌Cutting‌: Plasma, laser, or waterjet (pre-heat to 100°C for thickness >25mm).
  • ‌Welding‌: Use E7018-G electrodes with 150–200°C preheat (AWS D1.1).
  • ‌Bending‌: Minimum radius = 2x plate thickness (cold-formed).
  • ‌Corrosion Acceleration‌: Initial 6–12 months of exposure required for patina formation.

‌Quality Assurance‌

  • ‌Ultrasonic Testing‌: EN 10160 Class E1 for internal defect detection.
  • ‌Salt Spray Test‌: 1,000+ hours (ASTM B117) for corrosion validation.
  • ‌Certifications‌: EN 10204 3.1 MTRs, CE/PED compliance.

‌Competitive Advantages‌

  • ‌Lifespan‌: 50+ years in moderate climates without coating.
  • ‌Lead Time‌: 20–30 days (MOQ 1 ton).
  • ‌Sustainability‌: 100% recyclable with 15% lower carbon footprint than stainless steel.

‌Logistics & Compliance‌

  • ‌Packaging‌: VCI-coated + edge protectors for.
  • ‌Temperature Limits‌: Suitable for -40°C to 450°C service.
  • ‌Custom Coatings‌: Optional galvanized (GI) or epoxy (EP) finishes.

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Supplier of various types of carbon steel

Luo Kaiwei Steel Company is a comprehensive steel supplier that produces a variety of carbon steel plates, carbon steel pipes, galvanized steel, carbon steel coils, and steel profiles.

Luo Kaiwei Steel Company is a multi-ISO certified steel manufacturer specializing in carbon steel plates, pipes and galvanized coils since 2010. Competitive prices and ASTM/JIS compliant. Get instant quotes for bulk orders and global shipping support.

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