What are the grades of weathering steel?

Although weathering steel is a durable and strong material, exposure of weathering steel to extremely corrosive environments such as coastal and tropical coastal areas can cause material damage and failure. Protective rust requires constant wetting and drying cycles to hold on to itself, but if Corden steel is wetted but not dried, the protective layer will corrode and corrosion will occur. Failure is usually due to extensive corrosion due to prolonged humidity or poor design.

There are weathering steel, A588 weathering steel, hot-rolled weathering steel 09CuPCrNi-A, hot-rolled weathering steel Q450NQR1, hot-rolled weathering steel SPA-H, hot-rolled weathering steel B480GNQR, hot-rolled weathering steel Q345NQR2, hot-rolled weathering steel Q355GNHD, hot-rolled Weathering steel Q355NH, hot-rolled weathering steel 09CuP; cold-rolled weathering steel 05CuPCrNi, cold-rolled weathering steel SPA-C, cold-rolled weathering steel Q310NQL2, cold-rolled weathering steel Q310GNH.