Q345GNH is a high-strength weathering steel plate conforming to China's GB/T 4171 standard. With a minimum yield strength of 345MPa, it offers excellent atmospheric corrosion resistance through its copper-phosphorus alloy system (Cu-P-Cr-Ni).
The material develops a stable protective rust layer when exposed to weather, significantly reducing maintenance requirements. It maintains good weldability and formability while providing enhanced durability.
Typical applications include railway vehicles, bridges, shipping containers, and architectural structures. Compared to carbon steel, Q345GNH demonstrates 2-8 times better corrosion resistance in various atmospheric environments.
The steel is particularly suitable for unpainted outdoor applications where long-term structural integrity is required. Its cost-effective performance makes it a preferred choice for infrastructure projects in humid, industrial, or coastal regions.
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