... ,Tempering,Annealing Close die forging,Hot Forging,die forging Forged,Forged Ring,Hot Forging,Close Die Forging 1) Material: Carbon steel, alloy steel, stainless steel, aluminum, brass, magnesium,Titanium2 ... ) Possible Heat Treatment: Normalizing ,Annealing, Solution, Passivation4) Production machine: Hot die forging presses,Friction press machine,Middle Frequency electric heater, Air hammer ...