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cr-mo-co-v series bainitic high temperature bearing steel and preparation method thereof

A cr-mo-co-v, high-temperature bearing technology, applied in the metallurgical field, can solve problems such as reducing the life and reliability of domestic bearing steel, affecting the development of strategic emerging industries, and uneven carbide size and distribution.

Active Publication Date: 2022-07-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the uneven size and distribution of carbides greatly reduces the life and reliability of domestic bearing steel, seriously affecting the development of domestic high-end equipment manufacturing and strategic emerging industries

Method used

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  • cr-mo-co-v series bainitic high temperature bearing steel and preparation method thereof
  • cr-mo-co-v series bainitic high temperature bearing steel and preparation method thereof
  • cr-mo-co-v series bainitic high temperature bearing steel and preparation method thereof

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preparation example Construction

[0058] (3) The process in the preparation method of high-temperature bearing steel of the present invention only involves the cyclic operation of heating, heat preservation and cooling, which is simple and feasible; no chemical reagent is introduced in the whole process, and no pollution to the environment is caused; therefore, the present invention has the advantages of The production cost is low, pollution-free, easy to operate, and the effect of carbide uniformity and refinement is significantly improved;

[0059] (4) Through the combination of the first preheat treatment and the second preheat treatment, the microstructure of bainite was successfully obtained, and its volume percentage was controlled above 90%, and the content of retained austenite was controlled at 2 % below, the volume fraction of eutectic carbides is controlled at 3% to 5%, and the volume fraction of secondary granular carbides is controlled at 0.6% to 1%, which provides a good organizational basis for b...

Embodiment 1

[0062] A Cr-Mo-Co-V series bainite high-temperature bearing steel, the chemical composition in mass percentage is: C: 0.7wt%, Si: 0.1wt%, Mn; 0.1wt%, P<0.005wt%, S< 0.005wt%, Mo: 4.0wt%, Cr: 3.5wt%, Co+V: 1.5wt%, and the rest are Fe and unavoidable impurity elements during smelting.

[0063] The preparation method of the above-mentioned Cr-Mo-Co-V series bainitic high-temperature bearing steel comprises the following steps:

[0064] Step 1, Smelting:

[0065] Use high-quality molten steel as raw material, control harmful elements for vacuum induction furnace, electroslag remelting and vacuum self-consumption triple process smelting, vacuum degree is controlled at 0.5 × 10 -2 Pa, the molten steel temperature is 1550 ℃, the S content is controlled to be ≤0.003wt% and the P content is ≤0.005wt%, the carbon content of the tapping is controlled to 0.7%, the aluminum content of the tapping deoxidation is controlled to 0.025wt%, and argon gas is introduced throughout the process. ;...

Embodiment 2

[0081] A Cr-Mo-Co-V series bainite high-temperature bearing steel, the chemical composition in mass percentage is: C: 0.9wt%, Si: 0.4wt%, Mn; 0.4wt%, P<0.005wt%, S< 0.005wt%, Mo: 5.0wt%, Cr: 5.5wt%, Co+V: 5.5wt%, and the rest are Fe and unavoidable impurity elements during smelting.

[0082] The preparation method of the above-mentioned Cr-Mo-Co-V series bainitic high-temperature bearing steel comprises the following steps:

[0083] Step 1, Smelting:

[0084] Using high-quality molten steel as raw material, the harmful elements are controlled for the triple process smelting of vacuum induction furnace, electroslag remelting and vacuum self-consumption, and the vacuum degree is controlled at 0.6×10 -2 Pa, molten steel temperature is 1600 ℃, S content is controlled to be less than or equal to 0.003wt% and P content is controlled to be less than or equal to 0.005wt%, the carbon content of tapping is controlled to 0.9wt%, the aluminum content is controlled to 0.035wt% for tapping...

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Abstract

The invention provides Cr-Mo-Co-V series bainite high temperature bearing steel and a preparation method thereof. Based on the total mass of the high temperature bearing steel, in terms of mass percentage, in the high temperature bearing steel, the content of C is 0.7wt%-0.9wt%; the content of Si is 0.1wt%-0.4wt%; the content of Mn is 0.1wt%~0.4wt%; P content is less than or equal to 0.005wt%; S content is less than or equal to 0.005wt%; Mo content is 4.0wt%~5.0wt%; Cr content is 3.5wt%~5.5wt%; The total content of V and Co ranges from 1.5wt% to 5.5wt%; the rest are iron and inevitable impurities. The high-temperature bearing steel of the present invention has higher high-temperature mechanical properties such as high-temperature hardness, wear resistance, high strength and toughness, etc., and is helpful for prolonging the service life of the high-temperature bearing steel.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and specifically relates to a Cr-Mo-Co-V series bainite high-temperature bearing steel and a preparation method thereof. Background technique [0002] High-temperature bearings are important components of mechanical transmission equipment in high-temperature service such as aero-engines, high-speed trains, and gas turbines. effect. Because bearings need to work continuously and stably in harsh environments such as high speed, heavy load, high temperature and high contact stress, high temperature bearing steel is required to have high hot hardness, high temperature strength, high wear resistance and dimensional stability. As a kind of high hardenability steel, the traditional high temperature bearing steel is mainly composed of martensite, a small amount of retained austenite and undissolved cementite. Reducing the retained austenite content in high temperature bearing steel can improve dimen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C21D1/18C21D1/26C21D6/00C21D8/00C22C33/04
CPCY02P10/25
Inventor 张弛贺帅于淼李志峰陈浩杨志刚
Owner TSINGHUA UNIV
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