Non-heat treated, soft-nitrided steel parts
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United States of America Patent
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May 21, 2002
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N/A
app pub date -
Oct 30, 2000
filing date -
Nov 5, 1999
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Abstract
A non-heat treated soft-nitrided steel part respective contents of C, Si, Mn, P, Cr, Ti, V, N, Al, Pb, S and Ca of which are in specific ranges and which satisfies the following formulas (1) to (3). This part can be produced in a process of hot working, machining and soft-nitriding without any prior heat treatment, and has superior properties such as high fatigue strength and wear resistance. Fn1=-141.5(C %)-19.6(Mn %)+1280(N %)+95.6.ltoreq.60 (1) Fn2=-103.8(C %)+59.1(Mn %)+850.4(N %)+360.9.gtoreq.350 (2) Fn3=-13.4(C %)-3.45(Mn %)+112.7(N %)+13.2.gtoreq.7 (3)
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