1)api 5l gr.b sch ... B16.9 / 16.28, ASTM A53/A106, API 5L, ASME B36.10M---1996, DIN2605 / 2615 ... 12mIndustrial processhot rolled,hot expanded,cold drawn,and hot galvanizedSurface treatmentTransparent oil, rust-proof black ... time7 after receipt of advanced paymentCertificationAPI, CCS, and ISO9001:2000Payment TermFOB(30% down payment in advance ... inquiries will be reply promptly! api 5l gr.b sch 40