... ;Quenching,Tempering,Annealing Close die forging,Hot Forging,die forging Forged,Forged Ring,Hot Forging,Close Die Forging 1) Material: ... ,Annealing, Solution, Passivation4) Production machine: Hot die forging presses,Friction press machine,Middle Frequency electric heater, Air hammer,Precision machining ... , scaffold couplers7) Manufacturer certification: ISO9001 (2000) / TS16949 close die forging