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High-carbon bearing steel preparation method

A high-carbon bearing and alloy powder technology, which is applied in the field of bearing steel preparation, can solve the problems of bearing wear resistance, poor dimensional temperature resistance, and poor bearing tempering resistance.

Inactive Publication Date: 2020-12-29
C&U CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This material has high and uniform hardness, good wear resistance, and high contact fatigue performance after quenching and tempering; but its alloy content is low, so the bearing has poor tempering resistance and poor dimensional temperature resistance , the hardness will drop significantly after tempering above 200°C, which will affect the wear resistance of the bearing and reduce the service life of the bearing

Method used

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  • High-carbon bearing steel preparation method

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Embodiment approach

[0025] The invention discloses a second embodiment of a high-carbon bearing steel preparation method, which includes the following steps:

[0026] Step 1, pressing the alloy powder into a green body in a mold, the alloy powder includes, by mass percentage, C: 0.97%, Si: 1.01%, Mn: 0.37%, Cr: 3.77%, Mo: 0.29%, and the rest are Iron and unavoidable impurities;

[0027] Step 2, vacuum sintering the green body to obtain a sintered body;

[0028] Step 3: Quenching the sintered body at 820-835°C, cooling it with oil to 92°C, washing it with cold water, and keeping it at 160-190°C for 200 minutes.

[0029] The present invention discloses a third embodiment of a high-carbon bearing steel preparation method, which includes the following steps:

[0030] Step 1. Press the alloy powder into a green body in a mold. The alloy powder includes, by mass percentage, C: 1.08%, Si: 1.13%, Mn: 0.49%, Cr: 3.96%, Mo: 0.34%, and the rest is iron and unavoidable impurities;

[0031] Step 2, vacuum...

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Abstract

The invention discloses a high-carbon bearing steel preparation method which comprises the steps of 1, pressing alloy powder into a green body in a mold, wherein the alloy powder comprises the components in percentage by mass: 0.90 to 1.10 percent of C, 0.90 to 1.15 percent of Si, 0.20 to 0.50 percent of Mn, 2.00 to 4.00 percent of Cr, 0.10 to 0.50 percent of Mo, and the balance iron and inevitable impurities; 2, carrying out vacuum sintering on the green body to obtain a sintered blank; and 3, quenching the sintered blank at 820 to 860 DEG C for 30 to 50 minutes, cooling the sintered blank to60 to 120 DEG C through oil, cleaning the sintered blank with cold water at the temperature of 25 DEG C or below, and carrying out heat preservation at 160 to 250 DEG C for 2h to 4h. The bearing steel can effectively improve matrix strength and tempering resistance, and has more excellent dimensional stability at high temperature (150 DEG C to 200 DEG C).

Description

technical field [0001] The invention relates to the technical field of bearing steel preparation, in particular to a method for preparing high-carbon bearing steel. Background technique [0002] In recent years, with the increasingly harsh service conditions of bearings, the service temperature of bearings has become higher and higher. In addition to long life, there are also strict requirements for dimensional stability. In particular, the deterioration of the application conditions of automobile bearings requires the bearings to be more and more miniaturized, lightweight, high-speed and high-efficiency. Bearings not only require low friction, wear resistance and durability, but also require high-speed, high-load, Long life, high reliability and high dimensional stability under conditions such as high temperature. At present, bearings mainly use high-carbon chromium bearing steel represented by GCr15 (SUJ2, SAE52100 or 100Cr6), and the main characteristics of its chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C33/02C21D1/18
CPCC21D1/18C21D2211/008C22C33/0264C22C38/02C22C38/04C22C38/22
Inventor 牛玉周
Owner C&U CO LTD
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