Introduction to weathering steel
Weathering steel is a steel grade with excellent atmospheric corrosion resistance, which is to add a small amount of Cr, Ni, Cu, P and other elements to carbon steel to form a protective layer on the surface of the metal matrix, thereby slowing down further corrosion. The atmospheric corrosion resistance of weathering steel is 2~8 times that of ordinary carbon steel, with rust resistance, extending the service life of structural parts, thinning and consumption reduction, etc., mainly used in vehicles, bridges, containers, buildings, towers and other long-term exposure to atmospheric steel structures.
Q355NH weathering steel performance
Q355NH belongs to welded weathering steel
Atmospheric corrosion resistance index
Atmospheric corrosion resistance index (I) is an important index to evaluate the weather resistance of materials, the larger the index, the better the atmospheric corrosion resistance of steel, it is generally believed that when the index (I) ≥ 6.0 steel has better atmospheric corrosion resistance.
The atmospheric corrosion resistance index (I) is calculated as follows:
I=26.01(%Cu)+3.88(%Ni)+1.20(%Cr)+1.49(%Si)+17.28(%P)-7.29(%Cu)(%Ni)-9.10(%Ni)(%P)-33.39(%Cu)2
Fillet welding (before slag removal)
Fillet welding (after slag removal)
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Post time: Dec-12-2022