OD: 12 inch to 48 inch WT:6mm to 30mm standard:GB,ASTM,JIS,DIN,API5L,API5CT steel grade:ASTM A106, ... ,G3454,G3455; ST37,ST42,ST45-8,ST52; GB Q235,20#,10#,45#,16Mn,Q345 API PSL1,PSL2,X52,J55,K55,N80 ... , DIN, GB14”8-1516”8-1518”10-1620”10-1622”10-1824”10-1826”10-1828”10-1930”10-2032”10-2034”10-2036”12-2538”12-2540”13 ...