... OD:25---76mm WT:1.5--4.0mm Seamless tube and pipe for lowand medium pressure boiler-----American Petroleum Institute:Certificate ... A335P11, A335P12, A335P22, SA-213 T11 T22 T12, 10CrMo910, 12Cr2MoWVTiB (Steel Mortar102), 15CrMo, 35CrMo, 42CrMo, Cr5Mo, 12Cr1moV, 10MoWVNb, 07Cr2AlMo, 09CrMoAl ... , DZ50, N80, J55, GCr15, GCr15SiMn, GCr9, GCr9SiMn seamless tube and pipe for low and medium pressure boiler