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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 11667999 B1

PDFFull Text
Date of Patent:
Jun. 06, 2023

Filed:

Jul. 19, 2018

Carbo-nitriding process for martensitic stainless steel and stainless steel article having improved corrosion resistance

Applicants:

Ues Inc., Dayton, OH (US);

Midwest Thermal-vac Inc, Kenosha, WI (US);

Aktiebolaget Skf, Gothenburg, SE;

Inventors:

Hitesh K. Trivedi, Fairborn, OH (US);

Frederick J. Otto, Pleasant Prairie, WI (US);

Timothy W. Piazza, Jamestown, NY (US);

Bryan A. McCoy, Jamestown, NY (US);

Rabi S. Bhattacharya, Beavercreek, OH (US);

Assignees:

UES INC., Dayton, OH (US);

MIDWEST THERMAL-VAC INC., Kenosha, WI (US);

AKTIEBOLAGET SKF, Gothenburg, SE;

Attorneys:

J-Tek Law PLLC

Jeffrey D. Tekanic

Scott T. Wakeman

Primary Examiner:

Brian D Walck

Int. Cl.
CPC ...
C23C 8/32 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/52 (2006.01); F16C 33/62 (2006.01); F16C 33/64 (2006.01); C23C 8/58 (2006.01); C21D 6/00 (2006.01); C21D 9/40 (2006.01); C21D 1/06 (2006.01); C21D 1/25 (2006.01); C22C 5/04 (2006.01); C22C 19/03 (2006.01);
U.S. Cl.
CPC ...
C23C 8/32 (2013.01); C21D 1/06 (2013.01); C21D 1/25 (2013.01); C21D 6/005 (2013.01); C21D 6/007 (2013.01); C21D 9/40 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/52 (2013.01); C23C 8/58 (2013.01); F16C 33/62 (2013.01); F16C 33/64 (2013.01); C21D 2211/008 (2013.01); C22C 5/04 (2013.01); C22C 19/03 (2013.01); F16C 2202/04 (2013.01); F16C 2204/70 (2013.01); F16C 2240/06 (2013.01); F16C 2240/60 (2013.01);
Abstract

A method for producing a case-hardened martensitic stainless steel article includes: providing an article comprised, at least in part, of a martensitic stainless steel, carburizing the article within a temperature range of 1625° F.-1680° F. (885° C.-916° C.), and then carbo-nitriding the article within a temperature range of 1575° F.-1625° F. (857° C.-885° C.). An article, such as a bearing ring, comprising such a case-hardened martensitic stainless steel is also disclosed.

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