Steel, carburized steel component, and method for manufacturing carburized steel component

a carburized steel and component technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of high cost of cutting related to the cost of manufacturing carburized steel components, increased contact pressure on forming tools, and disadvantageous cutting, etc., to achieve excellent cold forgeability, high critical compression ratio, and small deformation resistance
US20180347025A1Inactive Publication Date: 2018-12-06NIPPON STEEL CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
NIPPON STEEL CORP
Publication Date
2018-12-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

A steel according to an aspect of the present invention has a chemical composition within a predetermined range, in which a hardenability index Ceq ranges from greater than 7.5 to smaller than 44.0, an AlN precipitation index IAlN ranges from greater than 0.00030 to smaller than 0.00110, a metallographic structure includes ferrite ranging from 85 to 100 area %, an average distance between sulfides, which are observed in a cross section parallel to a rolling direction of the steel and have an equivalent circle diameter ranging from 1 μm or greater to smaller than 2 μm, is shorter than 30.0 μm, and a presence density of the sulfides, which are observed in the cross section parallel to the rolling direction of the steel and have an equivalent circle diameter ranging from 1 μm or greater to smaller than 2 μm, is 300 pieces / mm2 or more.
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Description

TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to a steel, a carburized steel component, and a method for manufacturing a carburized steel component.

[0002] Priority is claimed on Japanese Patent Application No. 2015-232118, filed on Nov. 27, 2015, the content of which is incorporated herein by reference.RELATED ART

[0003] Generally, Mn, Cr, Mo, Ni, and the like are added in a combination to steels used for components for machine structural use. A steel for carburizing having such a chemical composition and being manufactured via processes such as casting, forging, and rolling is subjected to machining such as forging and cutting, and is then subjected to heat treatment such as carburizing. Accordingly, it is possible to obtain a carburized steel component including a carburized layer that is a hard layer in a surface layer area, and a steel portion that is a base metal which has not been affected by carburizing treatment.

[0004] Cutting related cost is very high in t...

Claims

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