PM M4 is a flexible, chromium-molybdenum high speed steel with high vanadium. This powder metal grade provides a unique combination of high wear resistance with high impact toughness and bend strength due to its fine grain size, small carbides, and superior cleanliness. The addition of vanadium also helps improve its corrosion resistance and fatigue resistance, and provides excellent high-temperature stability.
PM M4 offers improved cutting tool life compared to conventionally-wrought M1, M2, M7, and other lower-alloyed high-speed steels. It also excels in cold work tooling applications, outlasting high-carbon, high-chromium die steels, such as D2 and D3.
Other Known Names: CPM REX M4 steel®, ASP 2004, S690
Griggs Steel Color Code:Yellow
Broaches, End Mills, Punches, Hobs, Fine Blanking, and Forming Dies.
| Maximum | Typical | ||||||
|---|---|---|---|---|---|---|---|
| Carbon | Chromium | Tungsten | Molybdenum | Vanadium | Cobalt | Annealed | Tempered |
| C | Cr | W | Mo | V | Co | Hb | HrC |
| 1.4 | 4 | 5.65 | 5.2 | 4 | - | 255 | 65 |
| Density | Modulus Of Elasticity | Specific Gravity | Machinability |
|---|---|---|---|
| 0.287 lb/in3 (7944 kg/m3) | 30 x 106 psi (207 GPa) | 7.94 | 45-50% of a 1% carbon steel |
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