1.6981, 21CrMoNiV4-7, Temp. Resisting steelmax2019-01-06T10:56:02+09:003월 23rd, 2018| 1.6981, 21CrMoNiV4-7 는, Chromium + Molybdenum + Nickel 합금으로, 담금질성을 높이고 Tempering
