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Heppenstall Gr. 5M21
Alloy Digest (1966) 15 (12): TS-187.
Published: 01 December 1966
... Heppenstall Gr. 5M21 is a low-carbon, high-molybdenum and nickel precipitation hardening die steel developed especially for hot working of ferrous and nonferrous metals in press and upsetting machines. It is furnished to the Die Steel trade under the trade name of Prestem (in the prehardened...