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Heat treatment method of drilling tool steel

A heat treatment method and a technology for drill steel, which are applied in the field of production and manufacture of drill steel, and can solve problems such as unseen heat treatment process methods.

Pending Publication Date: 2022-01-28
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are many patent documents and articles on steel for rock drilling tools and its manufacturing method in China. For example, the patent document whose publication number is CN 108504938 A discloses a production method of hollow steel for rock drilling tools. The publication number is CN107974629 The patent literature of A discloses a kind of steel for drilling tools, its preparation method and drilling tools, but the heat treatment process for improving the fatigue performance of drilling tool steel products has not yet been seen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Billet forging, place the lowered billet in the heating furnace, keep it in the temperature range of 500°C-600°C, keep it for ≥2h, then raise the temperature to 1200±10°C at a heating rate of 100°C / h, keep it for ≥4h ;Quick forging out of the furnace, forging temperature ≥ 1050 ℃, compression molding;

[0021] (2) Pre-heat treatment, the initial product formed by compression molding is normalized, kept at 840°C for 4 hours, cooled in the furnace to 300°C, air-cooled after being released from the furnace, and then tempered, heated at 480°C for 8 hours and then air-cooled after being released from the furnace. Heat treatment is the next step The foundation of the process;

[0022] (3) Rough car, fine car, rough car on the lathe, car off the surface oxide layer, and then precisely control the size, finish car to complete the finished shape; drill holes, use a drilling machine to drill holes, remove burrs around the holes, and make the drill rod It is normally used tog...

Embodiment 2

[0027] (1) Billet forging, place the blank in the heating furnace, keep it in the temperature range of 600°C-700°C, keep it for ≥2h, then raise the temperature to 1200±10°C at a heating rate of 100°C / h, keep it for ≥4h ;Quick forging out of the furnace, forging temperature ≥ 1050 ℃, compression molding;

[0028] (2) Pre-heat treatment, the initial product formed by compression molding is normalized, kept at 840°C for 4 hours, cooled in the furnace to 300°C, air-cooled after being released from the furnace, and then tempered, heated at 480°C for 8 hours and then air-cooled after being released from the furnace. Heat treatment is the next step The foundation of the process;

[0029] (3) Rough car, fine car, rough car on the lathe, car off the surface oxide layer, and then precisely control the size, finish car to complete the finished shape; drill holes, use a drilling machine to drill holes, remove burrs around the holes, and make the drill rod It is normally used together wit...

Embodiment 3

[0034] (1) Billet forging, place the blank in the heating furnace, keep it in the temperature range of 700°C-800°C, keep it for ≥2h, then raise the temperature to 1200±10°C at a heating rate of 100°C / h, keep it for ≥4h ;Quick forging out of the furnace, forging temperature ≥ 1050 ℃, compression molding;

[0035] (2) Pre-heat treatment, the initial product formed by compression molding is normalized, kept at 840°C for 4 hours, cooled in the furnace to 300°C, air-cooled after being released from the furnace, and then tempered, heated at 480°C for 8 hours and then air-cooled after being released from the furnace. Heat treatment is the next step The foundation of the process;

[0036] (3) Rough car, fine car, rough car on the lathe, car off the surface oxide layer, then precisely control the size, finish car to complete the finished shape; drill holes, use a drilling machine to drill holes, remove burrs around the holes, and make the drill rod It is normally used together with br...

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Abstract

The invention belongs to the technical field of production and manufacturing of drilling tool steel, and particularly relates to a heat treatment method of drilling tool steel. According to the method, austenite grains can be fully recovered, recrystallized and refined through reasonable control over deformation temperature and the deformation amount in a forging process, and full preparation is made for improving toughness of steel; and then a cooling rate after forging is controlled, and slow cooling is conducted, so that in a deformation austenite transformation process, proeutectoid ferrite can be fully nucleated and grow up, and necessary conditions are provided for reducing a hardness value of a forging stock. According to the invention, furnace cooling is added after precision forging; and after the furnace cooling, the structure is mainly lath bainite, lath spacing is large, part of grain structure appears, full preparation is made for annealing, and a final blank is obtained after annealing and provided for a user.

Description

technical field [0001] The invention belongs to the technical field of production and manufacture of drill steel, and in particular relates to a heat treatment method for drill steel. Background technique [0002] With the development of society, it is more and more difficult to use in mining, tunnel and other construction, and the requirements are getting higher and higher. In domestic and foreign mining, railway, highway construction, port, power station construction, urban construction, quarrying and other engineering fields A large number of different types of drilling tools are used, and the quality requirements for drilling tools are getting higher and higher. [0003] The heat treatment technology of steel for drilling tools, the mechanical properties, physical performance parameters and quality are one of the key points in the manufacture of drilling tools. Rock drilling tools are used in tension, compression, bending, Under the action of cyclic stress such as torsi...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D1/28C21D1/18
CPCC21D8/005C21D1/28C21D1/18
Inventor 尹凤先
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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