What is the US equivalent of S355J2 N?

The US equivalent of S355J2 N (a European structural steel grade under EN 10025-2) is generally considered to be ASTM A572 Grade 50, as both are structural steels with similar mechanical properties. However, the match is not exact and depends on the specific application.

Comparison of S355J2 N and ASTM A572 Grade 50

Key Differences

1. Impact Testing: S355J2 N: The "J2" designation indicates that the steel has been tested for toughness at -20°C (-4°F). ASTM A572 Grade 50: Impact testing is not a standard requirement unless specified.
2. Heat Treatment: S355J2 N: Supplied in a normalized condition for improved mechanical properties. A572 Grade 50: Does not require normalization.
3. Applications: S355J2 N is often used in European construction projects like bridges and buildings. ASTM A572 Grade 50 is the standard for structural applications in the US, including bridges, buildings, and heavy machinery.

Alternative US Grades

• ASTM A992: Used for structural steel in building framing, with similar properties to A572 Grade 50.
• ASTM A36: A more general-purpose steel grade with lower strength compared to S355J2 N.

Conclusion

The closest US equivalent is ASTM A572 Grade 50, but for applications requiring guaranteed impact toughness at low temperatures, you may need to specify additional requirements or use other specialized grades. Let me know if you'd like detailed guidance for a specific use case!

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