Free-cutting steel and fuel injection system component using...

Details Free-cutting steel and fuel injection system component using... Free-cutting steel and fuel injection system component using...

2004-10-11

2008-03-04

Yee, Deborah (Department: 1793)

Alloys or metallic compositions

Ferrous

Lead, bismuth, selenium, tellurium or calcium containing

C420S085000, C420S129000, C420S128000, C420S126000

Reexamination Certificate

active

07338630

ABSTRACT:
The present invention is to provide a free-cutting steel capable of suppressing production of coarse inclusions, and having a high fatigue strength and a desirable machinability. The free-cutting steel aimed at solving the foregoing problems consists essentially of, in % by mass, C: 0.1-0.5%, Si: 0.05-2.5%, Mn: 0.1-3.5%, S: 0.0005-0.004%, Al: 0.01-0.06%, Ti: 0.003-0.01%, O: up to 0.0015%, N: 0.003-0.01%, Bi: 0.015-0.025%, and the balance of Fe and inevitable impurities, wherein the formula (1) below is satisfied:in-line-formulae description="In-line Formulae" end="lead"?−4.8≦log(([N]−0.0015)×[Ti]0.98)≦−4.3.   formula (1)in-line-formulae description="In-line Formulae" end="tail"?

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