1.ASTM A106/A53 GR.B carbon steel pipe 2.Outer diameter:1/2"-24" 3.Wall thickness: ... 52, Q 235, Q 195, Q345, 27SiMn SpecificationsChina StandardSteel GradeStandardseamless steel tubesand pipesfor structural purposeGB/T8162-199910, 20, 35, 45, ... 12Cr2MoISO 9329-2-1997 ASTM A161-94Seamless steel tubesfor petroleum crackingGB9948-8610, 20, 12CrMo, 15CrMo, 1Cr2Mo, 1Cr5Mo, JIS G3441-1988 Carbon Steel Pipe