Case hardening steel and carburized component obtained therefrom
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United States of America Patent
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Jun 23, 2020
Grant Date -
Nov 17, 2016
app pub date -
Jan 23, 2015
filing date -
Jan 30, 2014
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Abstract
The present invention provides a case hardening steel which satisfies the following expression (1) representing a relationship between a maximum deformation resistance σMAX (MPa) and a DI value, the maximum deformation resistance σMAX (MPa) being obtained when a test piece which has a size of ϕ 15×22.5 mm and is cut out from a material after spheroidizing, is subjected to compressive deformation by cold forging at a compression ratio of 70% in a state that an end surface thereof is restrained, and the DI value being obtained from a Jominy quenching test: σMAX<12.8×DI+745 . . . Expression (1). Additionally, the present invention obtains a carburized part by subjecting the case hardening steel to carburizing and quenching.
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