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

A high-carbon, high-chromium, tool steel technology, applied in the field of heat treatment of special steel materials, can solve the problem that it is difficult to reliably ensure the uniformity and stability of the hardenability crystal phase structure, the heat treatment process of the alloy composition is greatly affected, and the high-carbon steel materials Problems such as poor thermal conductivity can achieve high industrial application value, improve service life and mechanical properties, and eliminate creep

CN107739783AInactive Publication Date: 2018-02-27HUBEI ENG INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-02-27
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0017] refer to figure 1 , taking the high-carbon high-chromium tool steel precision parts with an average thickness of 24mm as an example, the hardness requirement is HRC59-62.

[0018] (1) Put a batch of workpieces with a thickness of 24mm into the quenching furnace and heat them twice. The first time is heated to 100°C at a heating rate of less than 75°C / hour, and the second time is heated at a heating rate of less than 115°C / hour. Heat to 150°C.

[0019]...