Q355NH weathering steel is composed of the following alloy components by weight: carbon: 0.12-0.21, silicon: 0.2-2.0, manganese: 0.7-2.0, sulfur ≤0.036, phosphorus ≤0.034, copper: 0.10-0.40, aluminum:0.2, the remaining is iron and trace impurities.
By alloying copper, manganese, silicon and aluminum in Q355NH weathering steel and simply adjusting the content of some elements in ordinary low carbon steel (Q235 steel), the economical weathering steel with good atmospheric corrosion resistance and comprehensive mechanical properties can be produced without changing the production process of Q235 steel.
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