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The abbreviation PM in HSS-PM does not refer to the alloying constituents of the high speed steel, but to the method of manufacture. The liquid steel melt is atomized by means of nitrogen. The powder is then hot isostatically pressed (so-called HIP process) and then brought into the respective shape by forging and rolling as in conventional steel production. The advantages of steel result from the more uniform and finer carbide distribution (carbide = hard materials in steel). This makes the material easier to machine. In application, however, it is still wear-resistant and has a high hot hardness.
Produces aluminum oxide layer at high temperature which reduces thermal conductivity, transferring heat into the chip. Excellent in dry machining, machining titanium alloys, inconel, stainless alloys and cast iron. Not recommended for use in aluminum and aluminum alloys.
