seamless pipe: Standard:GB8162/8163,ASTM A106/A53 GR.B,API 5L GR.B,API 5CT J55/N80 OD:4.1/2" to 8.5/8" WT:6-45mm Seamless pipe:Material: 20#, 45#,16Mn, 27SiMn,12Cr1MoV, 15CrMo, 10CrMo,910Cr5Mo,WB36OD: 6MM---820MMTH: 1.5MM---60MMLength: as requiredOEM is available.Standard: ASTM JIS DIN GB Package: export standard packing or as required