... with good condition of welding, antirust, explosion proof.Grade: Corten a and b, SPA-H, SPA-C, Q235NH, Q295NH, Q355NHThis steel ... corten section, thick wall, cold-formed, high strength, weathering, seamed and seamless steel tube, which are applied in the globe truss ... in various fields, like: shipping container, ship, train, bus and support frame of outside building on coastal area etc Weathering ...