... : DIN, ANSI, JIS, ASME, etc.4) Surface treatment: black rust-proof oil, transparent oil, hot galvanizing or as customer’s special requirement.5 ... , SCH40, SCH80, XS, STD, XXS6) Application: Petroleum, Chemical, Power, Gas, oil field, offshore, water system, Metallurgy, Ship- building, etc.Production capacityAnnual ...