1). The structure of 6CrW2Si steel is extremely fine after quenched at the recommended temperature of 880~900°C, the original austenite grains are above grade 12, and the remaining carbide diameter is ≤0.5μm.
The impact toughness increased along with the increases of tempering temperature. There are no temper brittleness from 350 to 380℃. Therefore, this process can be used for various tools (blade) that require medium hardness and wear resistance, especially for tire molds that are tempered at medium tempering temperature.
2). For tools that require high hardness and high wear resistance, appropriately increasing the quenching temperature can improve the impact toughness after a low-temperature tempering and significantly increase the service life.
For example, the cutting shear blades for shearing metal plates is heated to 980°C, completely austenitized and quenched, and then tempered at 250°C. Applications have proven that its service life is doubled. However, when using this process, it's a must to consider the use conditions and avoid the tempering brittle zone.
3). When the quenching heating temperature exceeds 980°C. Since the carbides have been completely dissolved, it is easy to cause the austenite grains to grow bigger, resulting in thick quenched martensite bundles. Therefore, heating temperatures exceeding 980°C are inappropriate.
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