1. International Equivalents of Corten Steel
United States (ASTM Standards)
• ASTM A242 – Early weathering steel standard
• ASTM A588 – Most common Corten equivalent (Grades A, B, C, K)
• ASTM A606 (Type 4) – For thinner sheet applications
• ASTM A847 – Used for tubing and hollow structural sections
Europe (EN Standards)
• EN 10025-5
◦ S355J0WP – Standard weathering steel
◦ S355J2WP – Improved toughness at lower temperatures
◦ S355J0W / S355J2W – Variants with different impact properties
Japan (JIS Standards)
• JIS G 3114\n◦ SPA-H – Most common weathering steel
◦ SMA490AW – Higher strength grade
China (GB/T Standards)
• GB/T 4171
◦ Q355NH – Equivalent to ASTM A588
◦ Q460NH – Higher strength variant\nInternational (ISO Standards)
• ISO 4952
◦ WR350A – Standard weathering steel
◦ WR450A – Higher strength version
2. Key Characteristics of Corten Equivalents
• High Strength: Yield strength typically 345–500 MPa (50–72 ksi)
• Weather Resistance: Forms a stable, self-protecting rust layer
• Weldability: Requires proper techniques (preheating may be needed)
• Applications: Bridges, building facades, shipping containers, sculptures
3. Selecting the Right Equivalent
• For US projects: ASTM A588 is the most widely available
• For European markets: EN 10025-5 grades (S355J0WP/S355J2WP)
• In Asia: JIS SPA-H (Japan) or GB/T Q355NH (China)
• For structural tubing: ASTM A847 or equivalent hollow sections
4. Important Considerations
• Corrosion resistance varies slightly between grades
• Availability depends on regional suppliers
• Fabrication requirements differ (some grades need special welding procedures)
