YXR7
(0.8% Carbon (C), 5% Chromium (Cr), 5% Molybdenum (Mo), 1.1% Vanadium (V), 1.1% Tungsten (W),) High quality high speed steel with very good toughness and high hardness, properties close to powder steels. Very high resistance to abrasive wear. Typical Rockwell hardness up to 66HRc. Japan / Hitachi steel
