... ISO9001:2008, (1) Rough Turned (2) Normalized/Q+T/Annealed forged alloy steel AISI 4130,AISI4140,AISI 4340 ISO9001:2008 Product ... quick forging machine, 5000 tons hydraulic press, ESR furnace, etc forged alloy steel AISI 4130,AISI4140,AISI 4340 ISO9001:2008