Hot work tool steels are steels that can withstand the high wear, high temperature, and high pressure conditions prevalent in manufacturing cells that perform processes such as metal forming, shearing and stamping at temperatures from 480 to 760°C (900 to 1400°F). These steels have a wear resistance of up to 540°C (1000°F). Next, the tool steel supplier will share the following content with you.
Hot work tool steels are designated as Group H steels, and they contain 0.35% to 0.45% carbon, 6% to 25% chromium, and vanadium, molybdenum, and tungsten as other alloying elements. Tungsten is primarily used in hot-formed tool steels because of its high-temperature strength, toughness, and resistance to grain growth.
Hot Work Tool Steels
Tungsten hot work steels constitute hot work steels of types H21 to H26. These steels have properties similar to other high-speed steels. Type H26 hot work steels have a lower carbon content than T1 high-speed steels. The main alloying elements of tungsten hot work steels include tungsten, carbon, chromium, and vanadium.
Tungsten hot work steels have a high alloying content, which enhances their heat resistance. The high alloying content also makes tungsten steels brittle and unsuitable for water cooling processes. Fracture of tungsten hot work steels can be reduced if they are preheated to working temperature prior to use. The normal working hardness of tungsten steels is 45 to 55 HRC. the thermal shock resistance and toughness of these steels can be improved by reducing the carbon content. In this case, it is also necessary to adjust the tungsten and vanadium content, as both reduce the hardenability of the steel by trapping large amounts of carbon in the form of carbides.
Oxidation can be reduced by quenching tungsten hot work steels in oil or hot salt. Tungsten hot work steels resist deformation during air-hardening and have a higher hardening temperature compared to chromium hot-work steels.
Tungsten hot work steels can be used in the following applications.
Manufacturing mandrels and extrusion dies for high-temperature applications, such as extruded brass, nickel alloys, and steel
Designing robust hot forging dies.
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