... high strength low alloy steel covering cold-formed welded square and rectangular tubing and pipe. The atmospheric corrosion resistance ... Cold rolled atmospheric corrosion resistance steel ASTM A871Gr60 Type 1, A871Gr65 Type 1 ASTM A606GR65, A6606GR70 GB/T4171 Q235NH, Q265GNH ... SMA490CP, SMA490CW, SMA570P, SMA570W BS43660 W50A, W50B ASTM A242 Type 1 ASTM A847 ASTM A690 ISO S355WP,S390WP, S235W,S355W ...