... )Casing pipe:API SPEC 5CTAnd some other pipesMain Material1)Boiler pipe:20G,A106c,ST45.8/3,10,202)Oil pipe:20,12CrMo,15CrMo3)High-pressure seamless ... us:CangZhou HengJia PipeLine Co., Ltd. Major steel production of seamless steel pipe, straight seam steel pipe, spiral steel pipe, galvanized steel pipe, steel sheet, strip, valves and so on. Committed ...