... , BS 6363, JIS C8305-...Grade: 10#-45#, Cr-Mo alloy, Mn-V alloy, 10MoWV...Grade: 10#, 20#, 15CrMo, 12Cr1MoV, 10CrMo910, C ... design available according to requirement.Black square tube with A53 material 1,mild steel 2,10-15days delivery time 3,15 ...