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Abstract

The present invention provides a steel product for gas carburizing used for manufacturing a carburized steel part. In the above steel product for gas carburizing, a composition of a base metal contains, in mass %, C: 0.1 to 0.4%, Si: exceeding 1.2 to 4.0%, Mn: 0.2 to 3.0%, Cr: 0.5 to 5.0%, Al: 0.005 to 0.1%, S: 0.001 to 0.3%, N: 0.003 to 0.03%, and O: limited to 0.0050% or less, and P: limited to 0.025% or less, and when the contents of Si, Mn, and Cr (mass %) are set to [Si %], [Mn %], and [Cr %], Expression (1) below is satisfied, and an alloy shortage layer satisfying Expression (2) below exists in a range from its surface to 2 to 50 μm in depth.

description='In-line Formulae' end='lead'32≧3.5[Si %]+[Mn %]+3[Cr %]>9  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'3.5[Si %]+[Mn %]+3[Cr %]≦9  (2)description='In-line Formulae' end='tail'

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First Claim