Spyderco byte October 2023 - EDGE-U-CATION
Crucible CPM M4
According to Crucible® Industries’ data sheet, “CPM® REX® M4 is a special purpose high speed steel designed to give high wear resistance in tools.” While that’s certainly true, it’s a bit of an understatement.
Among tool steels, CPM M4 offers a remarkable combination of malleable strength, high impact toughness, and extreme wear resistance. These qualities enable it to perform exceptionally well in cold-work tooling applications like punches, die and broach inserts, and taps, as well as premium cutting tools for use on abrasive alloys, heat-treated materials, and castings. In these demanding industrial uses, CPM M4 easily outperforms most other high-carbon, high-chromium die...