Why is Q355GNH steel plate corrosion-resistant?

Q355GNH steel to GB/T 4171 weathering steel standard
Q355GNH steel plate chemical composition
Carbon0.12 max., Silicon0.25-0.75, Manganese 1.00 max. , Phosphorus 0.07-0.15, Sulfur 0.020 max., Copper 0.20-0.55, Chromium0.30-1.25, Nickel 0.65 max.


Why is Q355GNH steel plate corrosion-resistant?
The addition of phosphorus, copper, chromium, nickel and other trace elements to the steel will form a dense and highly adherent protective film on the surface of the steel, hinder the spread and development of rust, and protect the substrate below the rust layer to slow its corrosion rate. An amorphous spinel oxide layer of about 50 μm to 100 μm thick formed between the rust layer and the substrate is dense and has good adhesion to the base metal. The presence of this dense oxide film prevents oxygen and The infiltration of water into the steel substrate slows down the development of rust into the steel material and greatly improves the atmospheric corrosion resistance of the steel material. Weathering steel is a steel system that can be used thinner, barely used, or simplified coating, which makes the product prolonged corrosion resistance, save labor and reduce consumption, and upgrade. It is also a modern metallurgical new mechanism, new technology, and new process. Continuous development and innovative steel systems.
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