Specification Size range: 8 1/2"~26" Material: AISI 4145H/AISI 4145H mod/AISI 4340/AISI4140-4142/non-mag material Forging process: Ingot---forging---heat treatment---rough machining---UT.MT---Q+T---inspection---finishing machining Heat treatment: Normalized / Annealed / Quenched / Tempered Hardfacing: HF1000, HF2000, HF3000, HF4000, HF5000