Heat treatment process of high-temperature resistant roller bearing steel

Abstract

The invention discloses a heat treatment process of high-temperature resistant roller bearing steel. The specific operation process of the heat treatment process of the high-temperature resistant roller bearing steel comprises steps that refined bearing steel with a low sulfur content is selected; after the bearing steel is subjected to calcined billet treatment to form billet steel, the billet steel is tempered under the condition that the temperature is 150 DEG C higher than the ambient working temperature; in the first 2 hours, the tempering temperature is changed between 150 DEG C and thehighest temperature without a residence time in the middle in a form of alternating a proportional function with an inverse proportional function, wherein the absolute values of the gradients of the proportional function and the inverse proportional function are the same; circulating is carried out for 3 times in the first hour and circulating is carried out for 2 times in the second hour; and thetempering temperature is changed in the form of pulses between 200 DEG C and the highest temperature within later 2 hours, the pulse interval time is 5 minutes, the duration time is 10 minutes, and then the tempering temperature is maintained at the highest temperature for at least 45 minutes. According to the heat treatment process of the high-temperature resistant roller bearing steel, the requirements on used materials are not high, and common steel can be used, so that the cost and the complexity of the process are effectively reduced, and the operation is simple.

Description

technical field [0001] The invention belongs to the field of bearing processing and relates to a heat treatment process for high temperature resistant roller bearing steel. Background technique [0002] Through a special structure, the method of cooling from the outside, by changing the structure of the bearing, or adding corresponding auxiliary equipment to achieve the purpose of cooling the entire bearing, this kind of bearing is not high in terms of its material requirements, general Bearing steel can handle it, but because of its special structure, it often has higher requirements for processing and installation, including working environment, such as working space, processing space and other requirements. Contents of the invention [0003] In order to solve the deficiencies of the prior art, the object of the present invention is to provide a simple, low-cost, high-efficiency heat treatment process for high-temperature resistant roller bearing steel. [0004] The tec...

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Problems solved by technology

[0002] Through a special structure, the method of cooling from the outside, by changing the structure of the bearing, or adding corresponding auxiliary equipment to achieve the purpose of cooling the entire bearing, this kind of bearing is not high in terms of its material requirements, general Bearing steel can handle it, but because of its special structure, it often has higher requirements for processing and installation, including working environment, such as working space, processing space, etc.