Method of nitriding work pieces of steel under pressure

Details Method of nitriding work pieces of steel under pressure Method of nitriding work pieces of steel under pressure

1992-08-07

1993-05-18

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148212, C21D 106

Patent

active

052117685

ABSTRACT:
Very low-pore, thick nitride cases may be obtained in a short time during a gas nitriding process in accordance with the invention. This process includes nitriding in a gaseous mixture containing about 5 to 95% by volume ammonia and about 95 to 5% by volume nitrogen. The nitriding process is most preferably carried out at essentially a constant pressure above about 0.2 MPa.

REFERENCES:
patent: 2779697 (1957-01-01), Chennault
patent: 4417927 (1983-11-01), Fullman
patent: 4793871 (1988-12-01), Dawes et al.
Kirk Othmer's Encyclopedia of Chemical Technology, vol. 15, Third Edition, pp. 313-323.

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