Non-heat treated steel for soft-nitriding

Details Non-heat treated steel for soft-nitriding Non-heat treated steel for soft-nitriding

2005-12-21

2008-08-26

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S330000, C148S332000, C148S336000

Reexamination Certificate

active

07416616

ABSTRACT:
Non-heat treated steel for soft-nitriding to form parts having high fatigue strength and excellent bend leveling property even in a case of applying soft-nitriding without thermal refining, comprising, by mass %, C: 0.30 to 0.45%, Si: 0.1 to 0.5%, Mn: 0.6 to 1.0%, Ti: 0.005-0.1% and N: 0.015 to 0.030%, and the balance Fe and impurities, having a mixed microstructure of bainite and ferrite whose bainite fraction is 5 to 90% or having a mixed microstructure of bainite, ferrite and pearlite whose bainite fraction is 5 to 90%, the steel could contain one or more of elements of Nb: 0.003 to 0.1% Mo: 0.01 to 1.0%, Cu: 0.01-1.0%, Ni: 0.01 to 1.0%, B: 0.001 to 0.005%, S: 0.01 to 0.1%, and Ca: 0.0001 to 0.005.

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Computer-generated English translation of Japanese patent 408176733 dated Jul. 9, 1996, Izumi, Koji et al.

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