Carburized-steel-component production method, and carburized steel component

一种制造方法、渗碳钢的技术，应用在渗碳钢部件的制造,渗碳钢部件领域，能够解决工序数量降低生产率、提高制造成本等问题，达到抑制生产率的降低、提高气体渗碳性的效果

Inactive Publication Date: 2016-08-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An increase in the number of processes reduces productivity and increases manufacturing costs

Method used

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  • Carburized-steel-component production method, and carburized steel component
  • Carburized-steel-component production method, and carburized steel component
  • Carburized-steel-component production method, and carburized steel component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0174] [Measurement of effective hardened layer depth and internal oxide ratio of carburized steel parts]

[0175] Steel materials of steel numbers 1 to 34 having the chemical compositions shown in Table 1 were prepared. Each steel material is subjected to hot forging and heat treatment to produce an intermediate product. Cutting processing (machining) was performed on the intermediate product to manufacture a 20 mm×20 mm square column-shaped steel part.

[0176] Table 1

[0177]

[0178] As shown in Table 2, the preliminary gas carburization and the main gas carburization were performed on the steel parts of each test number under the conditions shown in Table 2.

[0179] [Table 2]

[0180] Table 2

[0181]

[0182] In test numbers 1 to 30 and 33 to 36, the preliminary gas carburizing step was implemented under the conditions (carburizing temperature, carburizing time, carbon potential CP) shown in Table 2. Furthermore, following the preliminary gas carburizing ste...

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Abstract

Provided is a carburized-steel-component production method with which gas carburization properties of a steel component having a high Si content are improved, and with which a reduction in productivity can be inhibited. This production method is provided with a preliminary gas-carburization step, and a main gas-carburization step. In the preliminary gas-carburization step, a steel component having a chemical composition which includes, expressed in mass%, C, Si, Mn, and Cr, and which satisfies formula (1), namely (see description), is subjected to gas-carburization treatment for at least 10 minutes, but for less than 20 hours, at a carburization temperature (Tp) (in DEG C) satisfying formula (A), namely(see description), CP being substituted for the carbon potential during carburization in the preliminary gas-carburization step. In the main gas-carburization step, gas-carburization treatment is performed using a carburization time period (tr) (in minutes) and a carburization temperature (Tr) (in DEG C) which satisfy formula (B), namely (see description).

Description

technical field [0001] The present invention relates to a method for manufacturing a steel part and a steel part, and more specifically, to a method for manufacturing a carburized steel part produced by carburizing, and a carburized steel part. Background technique [0002] Steel components such as gears and bearings are used in harsh environments and are subjected to large loads through torque transmission, etc. Therefore, high surface fatigue strength is required for such steel parts. [0003] Typically, steel parts are manufactured as follows. First, intermediate products are produced by molding raw materials into target shapes. The intermediate product is subjected to a case hardening treatment to produce a steel part. Surface-hardened steel parts have high surface fatigue strength. [0004] As a method of improving the surface fatigue strength, JP-A-2013-204645 (Patent Document 1) discloses forming unevenness on the surface of a steel member by pickling. However, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D1/06C21D9/00C21D9/32C21D9/40C22C38/60C23C8/22
CPCC21D9/32C21D9/40C21D1/06C22C38/60C21D1/74C21D1/76C23C8/02C22C38/02C23C8/22C22C38/001C22C38/002C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C22C38/32C22C38/34C22C38/40C22C38/42C22C38/44C22C38/00C22C38/38
Inventor 小山达也久保田学
Owner NIPPON STEEL CORP
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