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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10202677 B1

PDFFull Text
Date of Patent:
Feb. 12, 2019

Filed:

Dec. 24, 2014

Production method of carburized steel component and carburized steel component

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Tatsuya Koyama, Nishio, JP;

Manabu Kubota, Nishinomiya, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Jenny R Wu

Int. Cl.
CPC ...
C23C 8/22 (2006.01); C21D 1/76 (2006.01); C21D 9/32 (2006.01); C21D 9/40 (2006.01); C21D 1/06 (2006.01); C22C 38/00 (2006.01); C22C 38/60 (2006.01); C21D 1/74 (2006.01); C23C 8/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/30 (2006.01); C22C 38/32 (2006.01); C22C 38/34 (2006.01); C22C 38/40 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01);
U.S. Cl.
CPC ...
C23C 8/22 (2013.01); C21D 1/06 (2013.01); C21D 1/74 (2013.01); C21D 1/76 (2013.01); C21D 9/32 (2013.01); C21D 9/40 (2013.01); C22C 38/00 (2013.01); C22C 38/60 (2013.01); C23C 8/02 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/30 (2013.01); C22C 38/32 (2013.01); C22C 38/34 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01);
Abstract

A production method of a carburized steel, which improves a gas carburizing property of a steel having a high Si content and suppress deterioration of productivity, includes preliminary and main gas carburizing processes. In the preliminary gas carburizing process, a steel having a chemical composition that contains C, Si, Mn, and Cr and, in mass %, satisfies Formula (1) is subjected to a gas carburizing treatment at a carburizing temperature T° C. that satisfies Formula (A) for 10 minutes to less than 20 hours. In the main gas carburizing process, a gas carburizing treatment is performed at a carburizing temperature T(° C.) that satisfies Formula (B) for a carburizing time tminutes.6.5<3.5[Si %]+[Mn %]+3[Cr %]≤18  (1)800≤<163×ln(+0.6)−41×ln(3.5×[Si %]+[Mn %]+3×[Cr %])+950  (A)4<13340/(+273.15)−ln()<7  (B) Where, CP in the formula is substituted by a carbon potential during carburization in the preliminary carburizing process.

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