... material: Carbon steel, Duplex and super duplex steel, alloy QT steel, high temperature steel, case hardened steel, Stainless steel, ... We provide smelting, forging, heat treatment, machining and testing. 4.We already passed ISO9001-2008, ISO14001-2004, GB/T28001-2001 ... strong technology team,we produce high level special steels .4)Quality Warranty:Yuanfang established top class Physical and chemical ...