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Cr-Mo-Co-V bainite high-temperature bearing steel and preparation method thereof

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

Active Publication Date: 2022-04-08
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 bainite high-temperature bearing steel and preparation method thereof
  • Cr-Mo-Co-V bainite high-temperature bearing steel and preparation method thereof
  • Cr-Mo-Co-V bainite high-temperature bearing steel and preparation method thereof

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preparation example Construction

[0058] (3) The technology in the preparation method process of the high-temperature bearing steel of the present invention only involves the cycle operation of heating, heat preservation and cooling, which is simple and feasible; no chemical reagents are introduced in the whole process, and the environment will not be polluted; therefore the present invention has the advantages of Low production cost, no pollution, easy operation, significantly improve the effect of carbide uniformity and refinement;

[0059] (4) By combining the first step of pre-heat treatment and the second step of pre-heat treatment, the structure of bainite was successfully obtained, and its volume percentage was controlled above 90%, and the content of retained austenite was controlled at 2 %, 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 bearing steel to...

Embodiment 1

[0062] A Cr-Mo-Co-V series bainitic high-temperature bearing steel, the chemical composition of which 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] High-quality molten steel is used as raw material, harmful elements are controlled to carry out triple process smelting of vacuum induction furnace, electroslag remelting and vacuum self-consumption, and the vacuum degree is controlled at 0.5×10 -2 Pa, the molten steel temperature is 1550°C, the S content is controlled to be ≤0.003wt% and the P content is ≤0.005wt%, the carbon content of the tapped steel is controlled at 0.7%, the aluminum content is controlled at 0.025wt% for the deoxidized steel, and argon gas is introduced thr...

Embodiment 2

[0081] A Cr-Mo-Co-V series bainitic high-temperature bearing steel, the chemical composition of which 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, controlling harmful elements for smelting in a triple process of vacuum induction furnace, electroslag remelting and vacuum self-consumption, the vacuum degree is controlled at 0.6×10 -2 Pa, the molten steel temperature is 1600°C, the S content is controlled to be ≤0.003wt% and the P content is ≤0.005wt%, the carbon content of the tapped steel is controlled at 0.9wt%, the aluminum content is controlled at 0.035wt% for the deoxidized steel, and argon is introduced throughout the pro...

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Abstract

The invention provides Cr-Mo-Co-V bainite high-temperature bearing steel and a preparation method of the Cr-Mo-Co-V bainite high-temperature bearing steel. Based on the total mass of the high-temperature bearing steel, the content of C in the high-temperature bearing steel is 0.7 wt%-0.9 wt% in percentage by mass; the content of Si is 0.1 wt%-0.4 wt%; the content of Mn is 0.1 wt%-0.4 wt%; the content of P is less than or equal to 0.005 wt%; the content of S is less than or equal to 0.005 wt%; the content of Mo is 4.0 wt%-5.0 wt%; the content of Cr is 3.5 wt%-5.5 wt%; the total content of V and Co is 1.5 wt%-5.5 wt%; and the balance of iron and inevitable impurities. The high-temperature bearing steel disclosed by the invention has relatively high high-temperature hardness, wear resistance, high strength and toughness and other high-temperature mechanical properties, and the service life of the high-temperature bearing steel is favorably prolonged.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to Cr-Mo-Co-V series bainitic high-temperature bearing steel and a preparation method thereof. Background technique [0002] High-temperature bearings are important components of high-temperature service mechanical transmission equipment such as aero-engines, high-speed trains, and gas turbines. Their operating temperatures are usually close to 300°C, which plays a vital role in the stability, reliability, long life and safety of the whole machine. role. 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. Traditional high-temperature bearing steel is a high-hardenability steel, and its microstructure is mainly composed of marten...

Claims

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Application Information

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Patent Type & Authority Applications(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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