Rare earth-containing high-carbon chromium bearing steel and preparation method thereof

Abstract

The invention provides rare earth-containing high-carbon chromium bearing steel and a preparation method thereof. The rare earth-containing high-carbon chromium bearing steel is prepared from, by weight, 0.95-1.05% of C, 0.15-0.30% of Si, 0.25-0.40% of Mn, 0.010% or less of P, 0.010% or less of S, 1.50-1.75% of Cr, 0.015-0.035% of RE, 3-5 ppm of O, and the balance of iron and inevitable impurities through blast furnace ironmaking, molten iron pretreatment, converter steelmaking, LF refining, RH refining and continuous casting. The rare earth alloy is divided into two parts, and the two parts are added in two stages after converter tapping and RH vacuum breaking, a better effect can be achieved after the rare earth alloy is matched with an electroslag remelting process, and the contact fatigue life L10 is larger than or equal to 6.1 * 10<7> times.

Description

technical field [0001] The invention relates to the technical field of bearing steel manufacturing, in particular to a rare earth-containing high-carbon chromium bearing steel and a preparation method thereof. Background technique [0002] High-carbon chromium bearing steel GCr15 is widely used in the inner and outer rings and rolling elements of rolling bearings for various mechanical equipment. Its metallurgical quality and performance after heat treatment directly determine the performance, life and reliability of the bearing and even the main engine. sex etc. With the development of high-end manufacturing industries, including high-speed precision machine tool spindle bearings, wind turbine spindle bearings, high-speed railway axle box bearings, etc., all require long service life and high reliability, which requires high-carbon chromium bearing steel used to have 10 7 Ultra-long contact fatigue life of more than one times. [0003] In the past hundred years, the chem...

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Problems solved by technology

[0004] Although the purity control level of domestic high-carbon chromium bearing steel has reached or surpassed that of western developed countries, there is still a gap between the contact fatigue life and that of western developed countries. How to further improve the contact fatigue life of high-carbon chromium bearing steel is a long-term issue for domestic researchers. Concerns