api 5l b erw steel pipe 1)Grades:304,304L,316,316L,317, ... 5CT Oil casing pipeMaterial:304,321.TP316L,310S,904L,347,2205,301,201Certification:ISOBrand:TISCO, LISCO, ZPSS, Jiangsu, HenanWall thickness:1mm ... :20000ton/yearMOQ:1 tons Oil Well Casing Pipe api 5l b erw steel pipe