seamless steel pipe API A106-5L 5Ct American Petroleum Institute:Certificate of Authority to use the Official API Monogram. seamless steel pipe API A106-5L 5CtOur products are made of 10#, 20 ... , A335P11, A335P12, A335P22, SA-213 T11 T22 T12, 10CrMo910, 12Cr2MoWVTiB (Steel Mortar102), 15CrMo, 35CrMo, 42CrMo, Cr5Mo, 12Cr1moV, 10MoWVNb, 07Cr2AlMo, 09CrMoAl, 09MnD ...