Standardapi, astm, bs, din, gb, jis, en Gradeq195 q215 q235 q345 , 10 20 45 , st35 st42 st52 Wall thickness1.2-2.0 mm Outer diameter20*20mm-80*80 mm Lengthcustomers request Techniquehot rolled Secondary or notnon-secondary Alloy or notnon-alloy Surfaceblack Applicationstructure pipe, machine, construction Special pipeemt pipe Section shapesquare