OD: 1 inch to 24 inch WT:3mm to 20mm standard:GB,ASTM,JIS,DIN,API5L,API5CT steel grade:ASTM A106,A53,X42,X52,X60,PSL1 SIZETHICKNESS(mm)STEEL GRADESTANDARD1”3-9 ASTM A106,A53,A333; JISG3456,G3454,G3455; ST37,ST42,ST45-8,ST52; GB 20#,10#,45#,16Mn ASTM, JIS, DIN, GB1 1/4”3-91 1/2”3-102”3-112 1/2”4-143”4-154”4-165”5-166”6-208”6-2010”6-2012”6-2514”7-2516”7-2518”7-2520”9-2522”9-3024”9-30 DIN1626 ...