Heat treatment process of high-nitrogen stainless bearings

A bearing steel and high nitrogen steel technology, which is applied in the field of high nitrogen stainless bearing steel heat treatment process, can solve the problems of reducing the quality of use, difficult to remove impurities, and higher requirements, so as to improve the quality of use and life, improve the quality of heat treatment, and improve the process. scientifically sound effects

Active Publication Date: 2017-01-25
QINGDAO BRANCH CO., LTD. OF MECHANICAL SCIENCE RESEARCH INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in addition to high fracture toughness, high contact fatigue life, and high wear resistance, the bearings used in industries with very harsh working conditions such as aerospace must also meet the requirements of salt spray, mold, and damp heat. "Three-proof" test requirements, but the traditional high-carbon chromium stainless bearing steel used in China cannot meet the performance requirements
Because traditional steel will inevitably produce large eutectic carbides, these carbides are unevenly distributed to form bands, most of which are precipitated on the grain boundaries, and cannot be eliminated during heat treatment, often affecting the grinding of bearing rings and Detrimental effects of superfinishing
[0003] High-nitrogen steel is a new field of material research. Due to the material properties of high-nitrogen steel, its development and application have attracted widespread attention from various countries, but there are still many problems that have not been resolved. For example, the traditional high-nitrogen steel in casting The process and the heat treatment process will make the high nitrogen steel production original and its own perfect state have a certain degree of difference, and the reason for these differences is not only the raw material ratio in the high nitrogen steel, but also the heat treatment process. One of the main reasons is that the heat treatment process in the prior art is relatively simple in the process of preheating, heating and cooling, because there are many impurities inside the bearing original, and these impurities are not easy to remove, and the working environment of the bearing original is relatively It is complex and has high requirements for bearing originals. During ordinary processing and use, the quality of the originals will be seriously reduced, resulting in a certain degree of reduction in wear resistance, contact fatigue and toughness, and the traditional heat treatment process exists A lot of energy is wasted, so a heat treatment process is urgently needed to improve the processing quality of high nitrogen steel bearing stainless steel

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] The present invention provides a technical solution: a high-nitrogen stainless bearing steel heat treatment process, the process includes the following steps:

[0023] S1: Select high-nitrogen steel liquid as the basic raw material, and use a suitable mold for casting to produce high-nitrogen stainless bearing steel originals;

[0024] S2: Set up multiple sand pools with different temperatures;

[0025] S3: Annealing, place the original in step S1 in the annealing furnace, set the high temperature of the annealing furnace to 800°C, the low temperature to 550°C, and place the original in the annealing furnace for 4.5 hours;

[0026] S4: Select sand tanks with temperatures between 350°C, 250°C, 150°C, 50°C, and 15°C, respectively, and label them as No. 1, 2, 3, 4, and 5, and place the originals in step S3 Go to No. 1 sand tank, when the temperature of the sand tank drops to the set temperature of the sand tank, take out the original and place it in No. 2 sand tank, simil...

Embodiment 2

[0034] The present invention provides a technical solution: a high-nitrogen stainless bearing steel heat treatment process, the process includes the following steps:

[0035] S1: Select high-nitrogen steel liquid as the basic raw material, and use a suitable mold for casting to produce high-nitrogen stainless bearing steel originals;

[0036] S2: Set up multiple sand pools with different temperatures;

[0037] S3: Annealing, place the original in step S1 in the annealing furnace, set the high temperature of the annealing furnace to 790°C, the low temperature to 580°C, and place the original in the annealing furnace for 5 hours;

[0038] S4: Select sand tanks with temperatures between 370°C, 270°C, 170°C, 80°C, and 25°C, respectively, and place the originals in step S3 Go to No. 1 sand tank, when the temperature of the sand tank drops to the set temperature of the sand tank, take out the original and place it in No. 2 sand tank, similarly, the original will pass through No. 1-...

Embodiment 3

[0046] The present invention provides a technical solution: a high-nitrogen stainless bearing steel heat treatment process, the process includes the following steps:

[0047] S1: Select high-nitrogen steel liquid as the basic raw material, and use a suitable mold for casting to produce high-nitrogen stainless bearing steel originals;

[0048] S2: Set up multiple sand pools with different temperatures;

[0049] S3: Annealing, place the original in step S1 in the annealing furnace, set the high temperature of the annealing furnace to 800°C, and the low temperature to 600°C, and place the original in the annealing furnace for 5.5 hours;

[0050] S4: Select sand tanks with temperatures between 400°C, 300°C, 200°C, 100°C, and 40°C, respectively, and place the originals in step S3 Go to No. 1 sand tank, when the temperature of the sand tank drops to the set temperature of the sand tank, take out the original and place it in No. 2 sand tank, similarly, the original will pass through...

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Abstract

The invention relates to the technical field of heat treatment processes, and relates to a heat treatment process of high-nitrogen stainless bearings. The process comprises the following steps: S1, selecting high-nitrogen steel liquid as a basic raw material; S2, arranging a plurality of sand tanks, wherein the sand tanks are different in temperature; S3, annealing; S4, selecting the sand tanks with temperature of 350-400 DEG C, 250-300 DEG C, 150-200 DEG C, 50-100 DEG C and 15-40 DEG C respectively; S5, preparing a surface smearing agent; S6, preheating; S7, firing components produced in the step S6 by using a flame gun; S8, selecting an air cooler and cooling the components produced in the step S7 via the air cooler; and S9, cooling the components cooled in the step S8 via air. Through the process, the resource waste is reduced to a certain extent; the abrasion resistance, contact fatigue and flexibility of the bearing components can be improved; the service quality of the bearing components is greatly improved, and the service life of the bearing components is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of heat treatment technology, and relates to a heat treatment technology for high-nitrogen stainless bearing steel. Background technique [0002] At present, in addition to high fracture toughness, high contact fatigue life, and high wear resistance, the bearings used in industries with very harsh working conditions such as aerospace must also meet the requirements of salt spray, mold, and damp heat. "Three-proof" test requirements, but the traditional high-carbon chromium stainless bearing steel used in China cannot meet the performance requirements. Because traditional steel will inevitably produce large eutectic carbides, these carbides are unevenly distributed to form bands, most of which are precipitated on the grain boundaries, and cannot be eliminated during heat treatment, often affecting the grinding of bearing rings and The superfinishing process has an adverse effect. [0003] High-nitrogen stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/84C21D1/18C21D1/70C21D1/52C21D9/40
CPCC21D1/18C21D1/26C21D1/52C21D1/70C21D1/84C21D9/40
Inventor 张康叶永
Owner QINGDAO BRANCH CO., LTD. OF MECHANICAL SCIENCE RESEARCH INSTITUTE
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