Standard: GB,ASME,DIN,API,ASTM Grade: Q195,Q215,Q235,Q345,ST37,ST52,STK400,GR.B,X42,X46,X52,X56,X60,... OD: 406mm to 1750mm Thickness: 6mm to 45mm Section Shape: Round Surface Treatment: Varnished, black oiled Type: Welded Welded Line Type: Longitudinal Brand: Shinestar Technique: Welded