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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 11326220 B1

PDFFull Text
Date of Patent:
May. 10, 2022

Filed:

May. 10, 2019

Method for producing machine component

Applicant:

Komatsu Ltd., Tokyo, JP;

Inventors:

Kensuke Sato, Tokyo, JP;

Koji Yamamoto, Tokyo, JP;

Yusuke Hiratsuka, Himeji, JP;

Kazuya Hashimoto, Himeji, JP;

Assignee:

KOMATSU LTD., Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Jessee R Roe

Int. Cl.
CPC ...
C21D 9/32 (2006.01); C21D 1/06 (2006.01); C21D 1/32 (2006.01); C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/44 (2006.01); C23C 8/22 (2006.01); C23C 8/80 (2006.01);
U.S. Cl.
CPC ...
C21D 9/32 (2013.01); C21D 1/06 (2013.01); C21D 1/32 (2013.01); C21D 6/002 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/44 (2013.01); C23C 8/22 (2013.01); C23C 8/80 (2013.01); C21D 2211/001 (2013.01); C21D 2211/002 (2013.01); C21D 2211/009 (2013.01);
Abstract

A method for producing a machine component excellent in pitting resistance characteristics and toughness includes a carburizing step, performed on a steel material containing 0.13-0.30% C and 0.90-2.00% Cr in mass % and at least one of Si, Mn, Ni, Mo, Nb, V, Ti, B, Al, and N, balance Fe and unavoidable impurities; heating the material to 850-1030° C. to attain carbon concentration in a surface of 0.8-1.5%; cooling the material at an average rate of 5° C./sec or lower from a temperature higher than the Apoint of a surface layer to a cooling end temperature that is at least 50° C. lower than the Apoint to cause the surface layer to have a pearlite or bainite structure with dispersion; spheroidizing annealing at a temperature not higher than the Apoint at the surface layer; heating the material to not higher than the Apoint at the surface layer; and performing tempering.

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