... China Patent for Invention Self-developed H13K,HMB and HMKhigh alloy steel BladeLinear guideway, shear blade, circular knives and spacers, ... 9CrSi, H13,and self-developed H13K,HMB and HMK high alloy series 6 Features:High intensity, high hardness, high toughness, ... after figuredin theory, cut δ≤60mm2 steel 3) HMK Chemical Composition Weight %CCrMoWVNiSiNbtombarthiteothers0.52~0.624.5~7.01.75~3 ...