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Bearing steel having improved fatigue durability and method of manufacturing the same

A bearing steel, spheroidizing technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of difficulty in ensuring strength and durability, increased bearing severity, and increased manufacturing costs, achieving weight reduction, improved strength, thickness, etc. falling effect

Inactive Publication Date: 2016-06-01
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, since the spheroidization process is a process requiring the growth of spherical particles, it takes a long time for the spheroidization and thus increases the manufacturing cost
Because the severity of the bearing increases due to miniaturization, size reduction, etc., it is difficult to ensure sufficient strength and durability life

Method used

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  • Bearing steel having improved fatigue durability and method of manufacturing the same
  • Bearing steel having improved fatigue durability and method of manufacturing the same

Examples

Experimental program
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Embodiment

[0070] Hereinafter, the inventive concept will be described in more detail through examples. These embodiments are only for illustrating the present inventive concept, and it is obvious to those skilled in the art that the scope of the present inventive concept should not be construed as being limited to these embodiments.

[0071] In order to examine physical properties such as hardness and durability life of the bearing steel made according to the inventive concept, Comparative Examples 1 to 4 and Examples 1 to 3 having the composition described in Table 1 below were manufactured.

[0072]

[0073] In Comparative Examples 1 to 4 and Examples 1 to 3 in Table 1, in the manufacturing process, the primary spheroidizing heat treatment temperature is set at about 800°C, the secondary spheroidizing heat treatment temperature is set at about 720°C, and the quenching temperature and time were set at about 850°C and about 1 hour, respectively, and the tempering temperature and time...

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PUM

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Abstract

A bearing steel includes 1.0 to 1.3 wt % carbon; 0.9 to 1.6 wt % silicon; 0.5 to 1.0 wt % manganese; 1.5 to 2.5 wt % nickel; 1.5 to 2.5 wt % chromium; 0.2 to 0.5 wt % molybdenum; 0.01 to 0.06 wt % aluminum; 0.01 to 0.1 wt % copper; at least one selected from the group consisting of more than 0 wt % and less than 0.38 wt % vanadium and more than 0 wt % and less than 0.02 wt % niobium; and a balance of iron.

Description

[0001] References to related applications [0002] This application claims priority to Korean Patent Application No. 10-2014-163799 filed on November 21, 2014 at the Korean Intellectual Property Office under 35 U.S.C § 119, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to a bearing steel having improved fatigue durability (fatigue durability) and a manufacturing method thereof, and to a bearing steel containing spheroidized complex carbides (to provide excellent hardness and strength and improved fatigue life, etc.) and its method of manufacture. Background technique [0004] In the vehicle industry, various eco-friendly vehicles have been developed with the goal of reducing carbon dioxide emissions to 95g / km, and the emissions will be 27% of the existing amount by 2021 according to European regulations. In addition, vehicle manufacturers are working hard to develop technologies to reduce size and ...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/46C22C38/48C21D8/06
CPCC22C38/02C21D1/18C21D1/32C21D8/065C21D9/525
Inventor 车星澈李始烨高永尚裴文基洪承贤
Owner HYUNDAI MOTOR CO LTD