Method for producing steel plate member

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United States of America Patent

PATENT NO 11898217
APP PUB NO 20210147956A1
SERIAL NO

17038479

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Abstract

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A method for producing a steel plate member (SPM), including: a quenching step for heating the SPM to a temperature higher than an austenite transformation finish temperature A3 and subsequently cooling the SPM at a cooling rate (CR) faster than an upper critical CR; and a tempering step for reheating a second region of the SPM to a temperature higher than an austenite transformation start temperature A1 without reheating a first region of the SPM after quenching and subsequently cooling the SPM at a CR slower than a lower critical CR. In the cooling process of the tempering step, the shape of the second region is corrected in a temperature range from a temperature equal to or lower than A1 to a temperature equal to or higher than a temperature at which transformation into ferrite and pearlite is finished while maintaining the CR slower than the lower critical CR.

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Patent Owner(s)

Patent OwnerAddress
TOYOTA JIDOSHA KABUSHIKI KAISHA1 TOYOTA-CHO TOYOTA-SHI AICHI-KEN 471-8571

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ihara, Tomoaki Toyota, JP 21 18
Kawano, Shoji Toyota, JP 2 5
Niihara, Masatomo Okazaki, JP 3 1
Yamamoto, Shinya Toyota, JP 349 2420

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