Heat treatment and quenching process for high-carbon high-chromium tool steel

Abstract

The invention discloses a heat treatment and quenching process for high-carbon high-chromium tool steel. The material is high-carbon high-chromium ledeburite cold-worked tool steel with the steel number of ASSAB XW-5 imported from Sweden, and the tool steel mainly comprises, by weight percentage, 2.05% of carbon, 12.5% of chromium, 1.3% of wolfram, 0.8% of molybdenum and 0.3% of silicon. The heattreatment and quenching process comprises the following steps that (1), workpieces are put into a quenching furnace to be preheated to 150 DEG C; (2), the workpieces are put into the quenching furnacefor two-stage heating until the quenching temperature is 965 DEG C, and then heat preservation is carried out; (3), the workpieces are taken out from the quenching furnace for air-blast quenching until the temperature is 70 DEG C; and (4) the workpieces are placed into a tempering furnace, the workpieces are heated to 280 DEG C, heat preservation and tempering are carried out on the workpieces, the workpieces are taken out from the tempering furnace for air cooling, and then the above procedures in the step (4) is repeated. According to the heat treatment and quenching process, staged heatingand twice tempering are adopted, and therefore the heating is more uniform, the hardenability of the workpieces is improved, the crystal grains can be refined, uniform, stable and reliable, the service life and the mechanical property of the parts are obviously improved, the toughness and the impact resistance of the workpieces are improved, and the use requirements of the precise parts are met.

Description

【Technical field】 [0001] The invention relates to the technical field of heat treatment of special steel materials, in particular to a heat treatment and quenching process of high-carbon and high-chromium tool steel. 【Background technique】 [0002] With the upgrading of my country's manufacturing industry, some precision equipment has more and more stringent requirements for parts and components. Domestic materials cannot meet their requirements in some aspects of performance, so relevant advanced imported materials have to be used, especially those from Germany, Sweden and other countries. Pure steel has excellent qualities such as high purity, fine grains, and uniform structure. The import volume has been increasing in recent years, but the heat treatment level is not suitable for it, and it is difficult to exert its performance, resulting in huge waste. Some suppliers We have to set up a special heat treatment service factory in China, which is not only difficult to meet th...

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Problems solved by technology

[0004] ASSAB XW-5 cold work die steel for precision parts requires high hardness, good wear resistance, stable size, long life and high reliability, but high carbon steel has poor thermal conductivity, and the alloy composition also has a great influence on the heat treatment process, resulting in The heat treatment process is complex, such as improper heat treatment, it is difficult to exert its excellent performance, the quality is difficult to control, it is easy to scrap in batches, and it is difficult to reliably ensure its hardenability and accurately control the uniformity and stability of the internal crystal structure of the material, resulting in parts Creep during work

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