Is S275n equivalent to A36?

No, S275N is not equivalent to A36 steel. While both are structural steels used in general construction and welding applications, S275N (EN 10025-3) is a normalized fine-grain steel with specified low-temperature impact toughness (-20°C), whereas A36 (ASTM A36) is a basic carbon steel without mandatory impact requirements and slightly lower strength properties. S275N is more akin to ASTM A572 Grade 50 for enhanced toughness, but A36 is closer to S275JR (EN 10025-2), a non-normalized variant.

Key Comparison Table

Notes: S275N's normalization provides finer grain and better cold toughness; A36 is cheaper but lacks specified impact. Substitution requires verifying project codes.

Why the Difference Matters

S275N's normalization and impact specification make it suitable for low-temperature service, where A36 might require additional testing or coatings. For exact equivalents, use A572 Gr. 50 (ASTM) for S275N's toughness.

Gangsteel supplies S275N with custom certifications for seamless substitution.

Summary

S275N is not equivalent to A36; S275N's normalization and -20°C impact (47 J) provide better cold toughness than A36's unspecified impact, while A36 is closer to S275JR. Use A572 Gr. 50 for S275N equivalents in ASTM projects.

FAQ

Why is S275N not equivalent to A36?

S275N requires impact at -20°C (47 J), which A36 lacks; A36 is basic carbon steel for room temp, while S275N is normalized for cold.

What is the closest ASTM to S275N?

A572 Grade 50, with 345 MPa yield and impact options matching S275N's toughness.

Can A36 substitute for S275N in cold applications?

No — A36 lacks specified impact; test for -20°C or use S275N/A572 Gr. 50.

Are welding requirements the same?

Yes, both low CEV (~0.40); no preheat ≤40 mm.

What is S275N's advantage over A36?

Better grain refinement and cold impact for offshore/bridges.