... BV.QC certificate Quick Details Standard: BS, JIS, GB, DIN, ASTM, APIStandard: BS 1387, BS 1139, BS 6363, JIS C8305-...Grade: 10 ... before 20 daysSpecifications1:specil design available according to requirement.Black square tube with A53 material 1,mild steel 2,10 ... :Manufactured to meet ISO9001, ASTM, API, SAE, DIN, BS, GB and SY requirementsApplication: Widely used in construction structure, machinery ...