Grade: YT15 Hardness: 91 for carbon steel and alloy steel continuous cutting of semi-intensive cars and fine cars. Intermittent cutting of fine cars. Cyclone wire, continuous surface of semi-intensive milling and fine milling, expanded and refined crude hole expansion. Nano-, ultra-fine grain and sub-grade fine grain grades such as 3-10% binder content, grain size less than 1um, with a high hardness and compressive strength, and has excellent abrasion resistance and reliability. Because of its high hardness, wear resistance and cutting sharp blade of these characteristics, widely used in the manufacture of wear-resistant parts, metal cutting tools.