Steel Seamless Pipe steel grade: C10, C20; standard: GB5312. Carbon Steel or Carbon Manganese Steel Seamless Pipe ... for Ship Building(1)Steel grade: C10, C20; (2)Standard: GB5312;(3)Specification: OD: 10mm-114.3mm (0 ... , such as steam boiler and heater in the ship C10, C20 carbon steel or carbon manganese steel seamless pipe for ship ...