... 20 daysSpecifications1:specil design available according to requirement.Black square tube with A53 material 1,mild steel 2,10-15days delivery ... 15mm-200*200mm 4,ISO.BV.QC certificate Black square tube with A53 materialDimensions:15*15mm -200*200mmThickness:0.6mm- ... A 106B, ASTM A53, X42Quality:Manufactured to meet ISO9001, ASTM, API, SAE, DIN, BS, GB and SY requirementsApplication: Widely used in ...