... ,SS,copper,brass 2)Heat Treatmment;Quenching,Tempering,Annealing Close die forging,Hot Forging,die forging Forged,Forged Ring ... ,Hot Forging,Close Die Forging 1) Material: Carbon steel, alloy steel, ... Production machine: Hot die forging presses,Friction press machine,Middle Frequency electric heater, Air hammer,Precision machining, and test facility5) ...