Ultrahigh-carbon bearing steel material for high-speed precision bearing as well as preparation method and application of ultrahigh-carbon bearing steel material

Abstract

The invention discloses an ultrahigh-carbon bearing steel material for a high-speed precision bearing and a preparation method and application of the ultrahigh-carbon bearing steel material. The ultrahigh-carbon bearing steel material comprises the following components in percentage by weight: 1.05-1.50% of C; 1.00% to 2.00% of Cr; 0.10% to 0.40% of Mn; 0.05% to 0.19% of Si; 1.10% to 2.50% of Al; and the balance of Fe. The ultrahigh-carbon bearing steel material disclosed by the invention has relatively high wear resistance and tempering stability; and the bearing is used for a high-speed precision bearing and can run at a high speed.

Description

Technical field [0001] The present invention pertains to a steel material and heat treatment technology and relates to the field of high-speed precision bearings bearing steel, and more particularly to ultra-high carbon bearing steel material and its preparation method and application for high-speed precision bearings. Background technique [0002] The bearing device is used in the field of mechanical parts, transportation, aerospace, defense and other, as far as the rotating member, the bearing connection is often required. [0003] The basic components of bearing steel since its inception in 1905, and now there are no major changes, bearing steel components in various countries is similar, there is no essential difference. In contrast, bearing steel quality compared to our still some gaps and some foreign countries, mainly in the inclusion control, block and carbide network control, uniformity ball of the organization of the poor. Which led to our high-speed rail bearings impor...

AI Technical Summary

Problems solved by technology

The DN value of the spindle bearings of high-speed machine tools in my country is only 2×10 6 The foreign DN value can reach 4×10 6 Among them, the main reason for the poor high-speed performance of the bearing is that the wear resistance of the bearing steel is not high and the tempering stability of the bearing steel is not high

[0004] The increase of DN value is mainly the contribution of the improvement of wear resistance. Wear resistance is the guarantee of bearing precision. When the bearing runs at high speed, it will generate heat, and the temperature of the bearing surface will increase. The increase of temperature will reduce the strength of bearing steel, resulting in Abrasion resistance is further reduced

Japan's NSK uses carbonitriding to solve this problem; carbonitriding can increase the carbon content of the working surface of the bearing and improve wear resistance, but the temperature of carbonitriding is low, about 850 ° C, resulting in The carburized layer is relatively thin, and the parts will be deformed after quenching after infiltration. The carburized layer may be worn off during the secondary grinding process, resulting in uneven hardness.

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