Case-hardened steel and carburized material

A technology of hardening steel and carburizing, applied in chemical instruments and methods, metal material coating process, coating, etc., can solve problems such as gear load increase, and achieve the effect of excellent fatigue resistance and excellent cold forgeability

Active Publication Date: 2015-04-01
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] On the other hand, in recent years, gears and the like used in automobiles have been required to reduce the size of the gears due to the reduction in vehicle body weight due to energy saving. The load also increases

Method used

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  • Case-hardened steel and carburized material
  • Case-hardened steel and carburized material
  • Case-hardened steel and carburized material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0084] Next, examples of the present invention will be described.

[0085] Melt the steel with the composition shown in Table 1 (the balance is iron and unavoidable impurities), heat it temporarily to above 1150°C, and then turn it into an intermediate billet with a square cross-section of 170mm×170mm, and then heat it to Ac3+100°C or above After that, it is formed into a round bar with a diameter of 60 mm by hot rolling. The cold forgeability of the obtained round bar was evaluated.

[0086] Table 1

[0087]

[0088] Here, cold workability was evaluated using two items of critical upset rate and deformation resistance.

[0089] That is, a test piece with a diameter of 10mm and a height of 15mm is collected from a position whose depth is 1 / 4 diameter (1 / 4D position) from the surface of the bar steel, and a 300t press is used to measure the compressive load during 60% upset forging, Calculated using the method of measuring deformation resistance using end-face limited com...

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Abstract

A component composition that includes 0.10 to 0.35 mass% C, 0.01 to 0.50 mass% Si, 0.40 to 1.50 mass% Mn, no more than 0.02 mass% P, no more than 0.03 mass% S, 0.04 to 0.10 mass% Al, 0.5 to 2.5 mass% Cr, 0.0005 to 0.0050 mass% B, 0.003 to 0.080 mass% Nb, no more than 0.003 mass% Ti, and less than 0.0080 mass% N, with the remainder comprising Fe and unavoidable impurities.

Description

[0001] This application is a divisional application of patent application 201180011314.6 (application date: January 26, 2011, name of invention: surface hardened steel and carburizing material). technical field [0002] The present invention relates to a case-hardened steel and a high-fatigue-strength carburized material that are excellent in cold forgeability and have high fatigue strength by carburizing, which are used as machine structural materials for construction machines and automobiles. Background technique [0003] High cold forgeability is required for parts materials such as automobiles produced by cold forming steel bars. As a result, the practice of performing a spheroidizing heat treatment to spheroidize carbides to improve cold forgeability has been carried out. In addition, from the viewpoint of the composition of the steel, there have been proposals to reduce Si, which has a large influence on the deformation resistance, and the like. Furthermore, steels th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32B32B15/04B32B5/14
CPCC22C38/02C21D1/06C21D1/25C21D6/002C21D2211/004C21D2211/008C22C38/002C22C38/04C22C38/26C22C38/28C23C8/22C23C8/80
Inventor 一宫克行长谷和邦木村秀途
Owner JFE STEEL CORP
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