Tool steel H13 ships annealed and machinable, and can then be air-hardened into a chromium-molybdenum hot-work tool steel valued for strength at elevated temperature, good toughness, and resistance to heat-cracking and thermal fatigue.
H13 (X40CrMoV5-1) is supplied annealed, with good machinability.
Chromium improves hardenability and oxidation resistance, molybdenum adds high-temperature strength, and vanadium forms wear-resistant carbides.
Tool steel H13 is well suited to die casting dies, extrusion tooling, and plastic molds needing excellent polishability.