... , STD, SCH40, SCH60,SCH80S, XS, SCH80 etc.Length1m-24mStandardAPI 5L, API 5CT, ASTM A53, ASTM A252, ASTM A500, ASTM A795, BS1387, BS1139 ... ,L485M, L555M, L625M, L690M, H40, J55, K55, M65, L80, C95, N80,Q125, S235GT, S195T, Grade 1, Grade 2, Grade 3, ST33 ... , STK290, STK400, STK490, STK500,STK540,STPG370, STPG410 etc.CertificateEN10217, EN10219, API 5L PSL1/ PSL2, KS 4602, KS3583, GB/T9711.1/2 ...