Q355NH is a high-performance weathering steel plate conforming to China's GB/T 4171 standard, offering superior atmospheric corrosion resistance with a minimum yield strength of 355MPa. The steel's advanced copper-phosphorus-chromium-nickel (Cu-P-Cr-Ni) alloy system enables formation of a dense, self-protecting oxide layer that significantly outperforms conventional steels, providing 4-8 times better corrosion resistance. This grade combines excellent mechanical properties with outstanding weather resistance, making it ideal for demanding structural applications in harsh environments. Q355NH maintains good weldability and formability while delivering enhanced durability against atmospheric corrosion. Typical applications include railway bridges, transmission towers, shipping containers, and architectural structures exposed to coastal or industrial atmospheres. The steel is particularly suitable for projects requiring long-term structural integrity with minimal maintenance. Compared to lower grades like Q295NH, Q355NH offers substantially improved strength and corrosion resistance, making it a preferred choice for critical infrastructure projects where both high load-bearing capacity and weather resistance are essential.
Hot Tags: gb/t 4171 q355nh weather resistant steel plate, China gb/t 4171 q355nh weather resistant steel plate manufacturers, suppliers, factory
