OD:8 inch to 48 inch WT:6mm to 30mm standard:GB, ... ,A53,X42,X52,X60,PSL1 SIZETHICKNESS(mm)STEEL GRADESTANDARD8”6-15 ASTM A53,A283-D,A106,A333; JISG3456,G3454,G3455; ST37 ... ,ST42,ST45-8,ST52; GB Q235,20#,10#,45#,16Mn,Q345 ASTM, JIS ... , DIN, GB10”8-1512”8-2014”8-2016”9-2518”9-2520”9-2522”10-3024 ...