... , BS 6363, JIS C8305-...Grade: 10#-45#, Cr-Mo alloy, Mn-V alloy, 10MoWV...Grade: 10#, 20#, 15CrMo, 12Cr1MoV, 10CrMo910, C...Thickness ... before 20 daysSpecifications1:specil design available according to requirement.Black square tube with A53 material 1,mild steel 2,10-15days ... ,15-15mm-200*200mm 4,ISO.BV.QC certificate Black square tube with A53 materialDimensions:15*15mm -200*200mmThickness:0.6mm ...