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Novel tempering technology adopted after high-speed steel quenching

A high-speed steel, a new type of technology, applied in the field of new tempering process, can solve the problems of slow bainite transformation, long time spent, disproportionate harvest, etc. Effect

Active Publication Date: 2017-07-04
重庆派斯克刀具制造股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this treatment method will not be used in the existing tempering treatment process. The reason is that when low-temperature tempering treatment is performed, the transformation speed of bainite is very slow, and it takes a long time. Generally, it takes more than 10 hours to complete the process. The amount of bainite required for transformation, the production efficiency of this method is extremely low, and the pay is out of proportion to the harvest

Method used

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  • Novel tempering technology adopted after high-speed steel quenching
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  • Novel tempering technology adopted after high-speed steel quenching

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Embodiment 1

[0032] A novel tempering process for high-speed steel after quenching, comprising the following steps:

[0033](1) Heat the M2 high-speed steel to 1210°C to austenitize the product, keep it warm for 8 minutes, and then cool it to 50°C;

[0034] (2) Tempering for the first time: After step (1) is completed, heat the product to 250°C, keep it warm for 80 minutes, then quench the water, and cool it in water for about 10 minutes to reduce the temperature of the product to 20-30°C;

[0035] (3) Second tempering: After the first tempering, heat the product to 250°C again, keep it warm for 80 minutes, then quench the water, and cool it in water for about 10 minutes, so that the temperature of the product drops to 20-30°C;

[0036] (4) The third tempering: After the second tempering, heat the product to 520°C, keep it warm for 80 minutes, and then air cool.

Embodiment 2

[0038] A novel tempering process for high-speed steel after quenching, comprising the following steps:

[0039] (1) Heat the M2 high-speed steel to 1220°C to austenitize the product, keep it warm for 10 minutes, and then cool it to 80°C;

[0040] (2) Tempering for the first time: After step (1) is completed, heat the product to 260°C, keep it warm for 90 minutes, then quench the water, and cool it in water for about 10 minutes to reduce the temperature of the product to 20-30°C;

[0041] (3) Second tempering: After the first tempering, heat the product to 260°C again, keep it warm for 90 minutes, then quench the water, and cool it in water for about 10 minutes, so that the temperature of the product drops to 20-30°C;

[0042] (4) The third tempering: After the second tempering, heat the product to 530°C, keep it warm for 90 minutes, and then air cool.

Embodiment 3

[0044] A novel tempering process for high-speed steel after quenching, comprising the following steps:

[0045] (1) Heat the M2 high-speed steel to 1230°C to austenitize the product, keep it warm for 12 minutes, and then cool it to 125°C;

[0046] (2) Tempering for the first time: After step (1) is completed, heat the product to 270°C, keep it warm for 100 minutes, then quench the water, and cool it in water for about 10 minutes to reduce the temperature of the product to 20-30°C;

[0047] (3) Second tempering: After the first tempering, heat the product to 270°C again, keep it warm for 100 minutes, then quench the water, and cool it in water for about 10 minutes, so that the temperature of the product drops to 20-30°C;

[0048] (4) The third tempering: After the second tempering, heat the product to 540°C, keep it warm for 100min, and then air cool.

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Abstract

The invention belongs to the technical field of heat treatment of iron-base alloys and particularly relates to a novel tempering technology adopted after high-speed steel quenching. The novel tempering technology includes the following steps that firstly, M2 high-speed steel is heated to 1210 DEG C to 1230 DEG C, the product is subjected to austenitizing, heat preservation is conducted for 8 min to 12 min, and cooling is conducted to the temperature lower than the martensite start temperature by 5 DEG C to 80 DEG C; secondly, the first time of tempering is conducted, wherein after the first step is completed, the product is heated to 250 DEG C to 270 DEG C, heat preservation is conducted for 80 min to 100 min, and then hardening is conducted; thirdly, the second time of tempering is conducted, wherein after the first time of tempering, the product is heated to 250 DEG C to 270 DEG C again, heat preservation is conducted for 80 min to 100 min, and then hardening is conducted; and fourth, the third time of tempering is conducted, wherein after the second time of tempering is conducted, the product is heated to 520 DEG C to 540 DEG C, heat preservation is conducted for 80 min to 100 min, and then air cooling is conducted. The novel tempering technology is used for machining the product, the toughness of the product can be improved while the product hardness is not reduced, and the service life of the product can be prolonged by about 17% to 24%; and in addition, due to the fact that the tempering temperature is greatly reduced, energy consumption is reduced by about 40% to 46%, and the production cost of an enterprise is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of iron-based alloys, and in particular relates to a novel tempering process for high-speed steel after quenching. Background technique [0002] High-speed steel is a tool steel with high hardness, high wear resistance and high heat resistance, also known as high-speed tool steel or front steel, commonly known as white steel. High-speed steel has good process performance, good strength and toughness, so it is mainly used to manufacture complex thin blades and impact-resistant metal cutting tools, as well as high-temperature bearings and cold extrusion dies. The M2 high-speed steel is a molybdenum-based high-speed steel. Due to its good hardness and wear resistance, it is mostly used to manufacture tools for cutting difficult-to-cut materials. [0003] figure 1 Shown is the conventional heat treatment and tempering process curve of M2 high-speed steel. It can be seen from the figure that t...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/20
CPCC21D1/18C21D1/20C21D2211/001C21D2211/002C21D2211/008
Inventor 陈海涛刘勇蔡进石剑
Owner 重庆派斯克刀具制造股份有限公司
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