Meaning
High-speed steels belong to a class of tool materials designed to maintain high hardness and wear resistance at elevated operating temperatures. The m35 tool steel is a cobalt-alloyed high-speed steel characterized by its elevated hot hardness and resistance to tempering. This alloy is widely used for drill bits, end mills, gear hobs, and broaches that operate under demanding cutting conditions.
It bridges the performance gap between standard molybdenum-tungsten steels and more expensive carbide tooling.
Alloying Design
Addition of cobalt to the alloy increases the matrix stability at high temperatures, which prevents the steel from softening during high-speed cutting. The composition also includes tungsten, molybdenum, and vanadium to form hard carbides that resist abrasive wear. This combination of elements ensures that the tool edge remains sharp during prolonged contact with tough alloy workpieces.
Heat Treatment
Achieving optimal properties requires a multi-stage thermal cycle including hardening, quenching, and multiple tempering steps. The material is typically heated to high temperatures to dissolve carbides, quenched to form martensite, and then tempered to relieve stress and increase toughness. This process yields a working hardness of sixty-four to sixty-six Rockwell C.
Machining Performance
Tools made from this alloy are used for cutting high-strength steels, titanium alloys, and stainless steels. The hot hardness of the material allows higher spindle speeds than standard high-speed steel, which increases production throughput in manufacturing environments.