Heat treated valve guide and method of making

Details Heat treated valve guide and method of making Heat treated valve guide and method of making

2005-02-08

2009-12-08

King, Roy (Department: 1793)

Metal treatment

Stock

Ferrous

C148S612000

Reexamination Certificate

active

07628870

ABSTRACT:
A valve guide of alloyed gray cast iron comprising from about 3 to about 3.5 wt. % carbon, about 0.2 wt. % phosphorous maximum, from about 0.35 to about 0.75 wt. % molybdenum, from about 1.8 to about 3 wt. % silicon, from about 0.6 to about 1 wt. % manganese, from about 0.8 to about 1.5 wt. % chromium, balance essentially iron, is heat treated by austenitizing, quenching, and tempering, to obtain a Rockwell C hardness from about 35 to about 45. The microstructure comprises at least about 3% intercellular carbide in a matrix of tempered martensite. Such valve guide exhibits improved wear resistance during use in an internal combustion engine.

REFERENCES:
patent: 1973263 (1934-09-01), Mitchell
patent: 3370941 (1968-02-01), Keuny
patent: 3384515 (1968-05-01), Ackerman
patent: 3472651 (1969-10-01), Keuny
patent: 4032334 (1977-06-01), Burk
patent: 4124413 (1978-11-01), Komatsu
patent: 4230506 (1980-10-01), Clark
patent: 4482396 (1984-11-01), Yamamoto et al.
patent: 4484547 (1984-11-01), Nickerson
patent: 5441024 (1995-08-01), Wietig et al.
patent: 5972128 (1999-10-01), Miwa
European Search Report, dated Apr. 25, 2006 issued for European patent application counterpart of above application.
Abstracts of Japan, Publication No. 2001107173, dated Apr. 17, 2001.
Metals Handbook, 8thEdition, vol. 1, 1961, Properties and Selection of Metals, pp. 363-365, American Society for Metals, Novelty, Ohio.
Metals Handbook, 8thEdition, vol. 2, 1964, Treating, Cleaning, and Finishing, pp. 207-211, American Society for Metals, Metals Park, Ohio.

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