GB/T 4171 Q415NH Weather Resistant Steel Plate

GB/T 4171 Q415NH Weather Resistant Steel Plate

GB/T 4171 Q415NH – 415MPa weathering steel with Cu-P-Cr-Ni alloy, superior rust protection. For bridges, offshore structures, and heavy transport. Combines high strength + extreme weather resistance.
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Description
Technical Parameters

Q415NH is a high-strength weathering steel under China's GB/T 4171 standard, offering 415MPa yield strength and enhanced atmospheric corrosion resistance. Its Cu-P-Cr-Ni alloy system forms a stable protective patina, providing 5-10× better durability than carbon steel in harsh environments.

Key Features:
High load capacity for demanding structures
Excellent weldability & formability
Self-protecting rust layer reduces maintenance
Performs well in coastal/industrial atmospheres

Typical Applications:

Long-span bridges

Offshore platforms

Heavy-duty containers

Critical infrastructure

Ideal where both strength and weather resistance are crucial, Q415NH outperforms lower grades (Q355NH/Q295NH) in extreme conditions while maintaining cost efficiency.

 

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