NITROCARBURIZED CRANKSHAFT MEMBER AND STEEL FOR NITROCARBURIZED CRANKSHAFTS
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United States of America Patent
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Issued Date -
Mar 26, 2015
app pub date -
Nov 26, 2014
filing date -
Dec 9, 2008
priority date (Note) -
Abandoned
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Abstract
A nitrocarburized crankshaft member made of a steel having essentially ferrite and perlite, and at least a portion of a steel surface thereof having a ferrite surface area of 50% or greater that is imparted with a nitrocarburized hard layer. The steel consists of C, Si, Mn, Cu, Ni, and Cr as required elements and Mo, N, s-Al, Ti, Pb, Bi, and Ca as optional elements that may be included, and Fe and inevitable impurities. C is within a range of 0.25 to 0.32%. The nitrocarburized crankshaft member includes a thickness of a surface compound layer of the nitrocarburized hard layer of 10 to 35 μm that is formed during establishment of a diffusion depth of a nitrogen diffusion zone below the surface compound layer of 700 μm or greater.
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