Tool Steels: Balancing Hardness, Toughness and Heat Resistance

The tooling problem

Tools face contact stress, abrasion, impact, thermal cycling and dimensional constraints. No single property guarantees life.

Carbides and matrix

Chromium, molybdenum, tungsten and vanadium form hard carbides, while the tempered martensitic matrix supplies support and toughness.

Families by service

Cold-work, hot-work, high-speed and mould steels are designed around different temperature and wear regimes.

Heat treatment discipline

Austenitising, quenching, tempering and sometimes cryogenic treatment determine retained austenite, carbide state and distortion.

Engineering takeaway

Match the steel and heat treatment to the dominant failure mode: wear, chipping, softening, heat checking or distortion.