M2 vs M4 HSS: Which to Choose?
AISI M2 is the workhorse high-speed steel of the converting industry. AISI M4 is its higher-vanadium cousin. The 1 % V difference looks small on a chemistry.
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AISI M2 (T11302) High-Speed Steel
AISI M2 is the workhorse high-speed steel of the converting and slitting industry. Molybdenum-tungsten-vanadium tool steel, hardened to HRC 62–65.