Method for producing machine component

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 11326220
APP PUB NO 20210032716A1
SERIAL NO

17046087

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Abstract

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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 Acm point of a surface layer to a cooling end temperature that is at least 50° C. lower than the A1 point to cause the surface layer to have a pearlite or bainite structure with dispersion; spheroidizing annealing at a temperature not higher than the Acm point at the surface layer; heating the material to not higher than the Acm point at the surface layer; and performing tempering.

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Patent Owner(s)

Patent OwnerAddress
KOMATSU LTD2-3-6 AKASAKA MINATO-KU TOKYO 1078414 JAPAN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hashimoto, Kazuya Himeji, JP 83 374
Hiratsuka, Yusuke Himeji, JP 4 3
Sato, Kensuke Tokyo, JP 37 352
Yamamoto, Koji Tokyo, JP 384 3625

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