Metal treatment – Compositions – Heat treating
Patent
1979-07-12
1981-10-13
Rutledge, L. Dewayne
Metal treatment
Compositions
Heat treating
148127, 148 167, C21D 148
Patent
active
042946301
ABSTRACT:
A method for continuously treating an iron member wherein the iron member is first subjected to furnace-brazing in a controlled gas environment and subsequently to a soft-nitriding treatment by addition of ammonia gas (NH.sub.3) to the controlled gas for the brazing. An apparatus for carrying out the method is also provided, and includes three partitioned chambers for brazing, annealing and soft-nitriding the iron member, each chamber being partitioned by a member such as a stainless steel film curtain at opposite sides thereof. A controlled gas feed system communicates with each of the chambers, and an ammonia gas feed system is connected to the soft-nitriding chamber.
REFERENCES:
patent: 2908072 (1959-10-01), Johnson
patent: 3055007 (1962-09-01), Bell
patent: 3557423 (1971-01-01), Wolfe et al.
patent: 3615920 (1971-10-01), Talento
patent: 4003764 (1977-01-01), Wunning
patent: 4046601 (1977-09-01), Hook
patent: 4145235 (1979-03-01), Gondo et al.
"Soft Nitriding Gives Hard Surface to Steel, Cast Iron", Iron Age, vol. 212, p. 33, Aug. 2, 1973.
Metals Handbook, 8th ed., vol. 6, p. 599.
Hidaka Akio
Kanno Tadao
Kobayashi Shunji
Watanabe Teruoki
Burt Pamela S.
Honda Giken Kogyo Kabushiki Kaisha
Rutledge L. Dewayne
Sheehan John P.
Shortley John L.
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