1.2162, 21MnCr5, AISI 5120, Case-Hardening steelmax2019-01-05T22:26:27+09:003월 24th, 2018| 1.2162, 21MnCr5 를, 질화(carburized), quenched and tempered 하면, 표면경도는 minimum 60 HRc 이상
