Metallurgical apparatus – Means treating solid metal – By contact with gas
Patent
1990-10-01
1992-05-12
Yee, Deborah
Metallurgical apparatus
Means treating solid metal
By contact with gas
266255, 266252, C21D 9663
Patent
active
051120305
ABSTRACT:
This invention relates to a method of nitriding steel material in a second heat treatment furnace after fluorinating the steel material in a first heat treat furnace to form a deep and uniform nitrided layer. Then, steel material is treated smoothly by defining the ratio of establishing said both furnaces for fluorinating and nitriding on the basis of treating time required for said both treatments since time required for each treatment is different.
REFERENCES:
patent: 568314 (1958-12-01), Knight
patent: 3024015 (1962-03-01), Huebler et al.
patent: 3980467 (1976-09-01), Camacho
patent: 4846675 (1989-07-01), Soliman
Kitano Kenzo
Minato Teruo
Senbokuya Haruo
Tahara Masaaki
Daidousanso Co. Ltd.
Maizuru Kogyo Co., Ltd.
Yee Deborah
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