Process for heat treating metals in a continuous oven under cont

Details Process for heat treating metals in a continuous oven under cont Process for heat treating metals in a continuous oven under cont

1990-06-26

1991-12-03

Roy, Upendra

Metal treatment

Compositions

Heat treating

148 165, 148153, 148157, 266 81, C21D 174

Patent

active

050697285

ABSTRACT:
Heat treating metals by continuous longitudinal passage of metallic pieces in an elongated treating zone under controlled atmosphere having a high temperature upstream end where the controlled atmosphere comprises nitrogen and reducing chemical substances, such as hydrogen, possibly carbon monoxide, and a downstream cooling end under an atmosphere essentially formed by introducing nitrogen. In the high temperature upstream end, the nitrogen which constitutes the atmosphere is supplied by introducing nitrogen with a residual oxygen content not exceeding 5%, the reducing chemical substances being present at any moment in amounts at least sufficient to eliminate oxygen introduced with nitrogen. The nitrogen introduced in the downstream cooling end is substantially free of oxygen. Application of the process to the annealing of metallic pieces.

REFERENCES:
patent: 3492378 (1970-01-01), Simoncic
patent: 3950192 (1976-04-01), Golland et al.
patent: 4049472 (1977-09-01), Arndt
patent: 4183773 (1980-01-01), Kawasoko et al.
patent: 4334938 (1982-06-01), Shay et al.
patent: 4415379 (1983-11-01), Stenescu et al.
patent: 4531984 (1985-07-01), Madsac et al.
"Stealing Nitrogen from the Air", Advanced Materials & Processes, vol. 134, No. 3, Sep. 3, 1988, by W. C. Quantz, pp. 100, 102, 104 & 107.
"Heat Treating Processes with Nitrogen and Methanol-Based Atomsphere", J. Heat Treating, vol. 2, No. 1, 1981, by M. Kostelitz et al., pp. 35-42.
"Carbon Potential and Composition of a Neutral Controlled Atmosphere Produced from Methane and a Nitrogen-Oxygen Mixture", Metal Science & Heat Treatment, vol. 30, Nos. 5-6, May-Jun. 1988, N. A. Titov, pp. 408-414.

Affiliated with

Also associated with

Rating

Process for heat treating metals in a continuous oven under cont does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for heat treating metals in a continuous oven under cont, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for heat treating metals in a continuous oven under cont will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1694852