Method of production of steel soft nitrided machine part

Details Method of production of steel soft nitrided machine part Method of production of steel soft nitrided machine part

2006-11-27

2010-10-19

King, Roy (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

C420S109000

Reexamination Certificate

active

07815750

ABSTRACT:
The present invention provides a method of production of a steel soft nitrided machine part comprising: preparing a steel material containing, by mass %, C: 0.15-0.30%, Si: 0.03-1.00%, Mn: 0.20-1.5%, S: 0.04-0.06%, Cr: 0.01-0.5%, Mo: 0.40-1.5%, Nb: 0.005-0.05%, Ti: 0.005-0.03%, V: 0.2-0.4%, Ni: 0.05-1.5%, N: 0.002-0.0048%, a balance of Fe and unavoidable impurities, limiting P to 0.02% or less, limiting Ceq. (equation (1)) to 0.65-0.85, controlling DI (equation (2)) to 80-155, log Kp (equation (3)) to 2.5-8, and Si and Mn contents according to equation (4), heating the steel material to 1150-1280° C., hot forging the steel material to the shape of the part, cooling the steel material at a 0.5-1.5° C/sec cooling rate to obtain a hot forged part having a micrometallic structure with more than 50% of bainite, machining the hot forged part, and soft nitriding the machined hot forged part at 550-650° C. for 30 minutes or more.

REFERENCES:
patent: 5041167 (1991-08-01), Miwa
patent: 57-063628 (1982-04-01), None
patent: 11-62943 (1999-03-01), None
patent: 2001-131687 (2001-05-01), None
patent: 2002-226939 (2002-08-01), None
English Translation of JP 57-063628.
Office Action issued by the German Patent Office on Feb. 20, 2008 in connection with corresponding German Patent Application No. 10 2006 055 922.3.
Translation of the Office Action issued by the German Patent Office on Feb. 20, 2008 in connection with corresponding German Patent Application No. 10 2006 055 922.3.

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