Tag: M4 high speed steel

A side-by-side comparison of high-speed steel and tungsten carbide for industrial machine knives — covering hardness, toughness, cost, edge retention and the substrates each material was actually designed to cut.

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 sheet but it changes how the knife cuts, how it grinds, and how long it lasts. Here is the engineering comparison.