M4 is a high-vanadium special purpose high spped steel exhibiting better wear resistance and toughness than M2 and M3 in cold work punches, die inserts, and cutting applications involving high speed and light cuts used. The high carbon (HC) modification to standard M4 is designed to provide optimum hardening response in large cross-section tools or in vacuum or atomosphere heat treating. The high sulfur (HS) modification is standard for large diameter bars providing enhanced machinability and grindability.
Typical applications include: Paper Slitters and Trimmers * Punches * Dies * Molds * Milling Cutters
Typical chemistry: Carbon 1.40% * Manganese .30% * Chromium 4.00% * Vanadium 4.00% * Tungsten 5.50% * Molybdenum 5.25% * Sulfur .06%