... , main shaft; 2 Materials: carbon , stainless and alloy steel; 3 Proces: hot forging, machining; 1,name: Flexible forged shafts, heavy ... shafts,large shaft forging 2,materials: carbon,stainless,alloy steel 3,proces: hot forging 4,certificates: ISO9001-2000,GL,Product ... Testing Standard: ASTM A609,EN 12680-1,SEP 1922(IN 1690-T2)Magnetic Testing Standard: ASTM A125,ISO 4986 wind turbine main shafts