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Steel material

A technology of steel and chemical composition, which is applied in the field of steel, can solve problems such as cracks, and achieve high fatigue strength, excellent resistance to hydrogen embrittlement, and a large limit processing rate.

Active Publication Date: 2021-08-13
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the case of forming into a complex shape, cracks may occur in the part where a large processing is applied

Method used

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Embodiment

[0229] The effect of one aspect of the present invention will be further specifically described through examples. The conditions in the following examples are an example of conditions adopted for confirming the feasibility and effect of the steel material for carburized steel parts according to the present embodiment. Therefore, the present invention is not limited to this conditional example. In the present invention, various conditions can be adopted as long as the purpose of the present invention can be achieved without departing from the gist of the present invention.

[0230] Molten steel having the chemical composition shown in Table 1 was prepared.

[0231] [Table 1]

[0232]

[0233]The blank part in Table 1 means that the content of the corresponding element is below the detection limit. That is, a blank portion means that the smallest digit of the corresponding element content is less than the detection limit. For example, in the case of the Ti content in Tabl...

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Abstract

The present invention provides a steel material which has a high critical working ratio during cold forging and exhibits high fatigue strength and excellent hydrogen embrittlement resistance characteristics after being formed into a carburized steel component. A steel material according to one embodiment of the present invention has a chemical composition that contains, in mass%, 0.07-0.13% of C, 0.15-0.35% of Si, 0.60-0.80% of Mn, 0.005-0.050% of S, 1.90-2.50% of Cr, 0.0005-0.0100% of B, 0.010% or more but less than 0.050% of Ti, 0.010-0.100% of Al, 0.0002-0.0030% of Ca, 0.0080% or less of N, 0.050% or less of P and 0.0030% or less of O, with the balance being made up of Fe and impurities, while satisfying the formula (1) to formula (5) that are described in the description.

Description

technical field [0001] The present invention relates to steel materials, and more specifically, to steel materials as blanks for carburized steel parts. Background technique [0002] Steel materials used as raw materials for machine structural parts generally contain Mn, Cr, Mo, Ni, and the like. A steel material having a chemical composition containing the above-mentioned elements and produced through casting, forging, rolling, etc., is formed by machining such as forging, cutting, and further carburized to form a carburized layer with a surface layer and a specific carburized layer. layer more inner core of the carburized steel component. In this specification, unless otherwise specified, carburizing treatment also includes carbonitriding treatment. [0003] Among the costs of manufacturing such carburized steel components, the costs associated with machining are very large. In cutting processing, cutting tools are relatively expensive. In addition, since a large amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06C21D9/28C21D9/32C22C38/00C22C38/60C21D1/06
CPCC22C38/00C21D8/06C21D9/28C21D1/06C22C38/60C21D9/32C22C38/002C22C38/46C22C38/04C22C38/02C22C38/001C22C38/50C22C38/42C22C38/54C22C38/06C22C38/005C22C38/44C22C38/48C22C38/28C22C38/32
Inventor 志贺聪根石丰
Owner NIPPON STEEL CORP
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