Because weather resistant steel plate is added with weathering elements, it makes the steel material form a dense oxide layer with a thickness of about 50-100 μm and good adhesion between the rust layer and the substrate. It is precisely because of the existence of this dense oxide film that oxygen and water in the atmosphere are prevented from penetrating into the steel matrix, which reduces the longitudinal development of corrosion to steel materials, thereby greatly improving the corrosion resistance of steel materials.
Weather resistant steel plate has good resistance to atmospheric corrosion, in which alloying elements play a pivotal role, including preventing the production of rust layer, delaying the crystallization of rust layer, and preventing cracks and defects.
Because carbon is detrimental to the atmospheric corrosion resistance of steel, it affects welding, cold brittleness and stamping properties. Therefore, the carbon in Weather resistant steel plate is controlled below 0.12%. Copper is resistant to atmospheric corrosion. Copper forms an anti-rust barrier layer on the steel substrate, but copper forms an intergranular effect between crystals, which is prone to cracks. Phosphorus is one of the essential elements for improving atmospheric corrosion resistance. But phosphorus affects the welding performance of steel.
Therefore, Weather resistant steel plate very cleverly blends the properties of these elements, making itself a highly corrosion-resistant steel
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