Desulfurization process for ferrous powder

Details Desulfurization process for ferrous powder Desulfurization process for ferrous powder

1980-12-17

1983-11-15

Thomas, Earl C.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder pretreatment

419 30, 75 05BA, 1481261, 148 16, B22F 100, C21C 102, C22B 102

Patent

active

044155271

ABSTRACT:
A method for producing a low carbon ferrous powder melt stock with a sulfur content of less than 5 parts per million is disclosed comprising the steps of atomizing molten steel into a powder, exposing the powder to a temperature of at least 2100.degree. F. in a hydrogen containing atmosphere until the sulfur content has been reduced to the desired level, and cooling the desulfurized powder to ambient temperature in a non-oxidizing atmosphere. During heat treatment an interconnected porosity of at least 10% is maintained for the powder.

REFERENCES:
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patent: 2687349 (1954-08-01), Schlecht et al.
patent: 3073695 (1963-01-01), Silbereisen et al.
patent: 3287181 (1966-11-01), Steverding
patent: 3325277 (1967-06-01), Huseby
patent: 3436802 (1969-04-01), Cohen
patent: 3668024 (1972-06-01), Johnson
patent: 3716095 (1971-02-01), Ritzmann et al.
patent: 3725142 (1973-04-01), Huseby
patent: 3881912 (1975-05-01), Mikurak
patent: 3954461 (1976-05-01), Chao et al.
The Metal--Iron, Alloys of Iron Monographs by Cleaves and Thompson p. 69 (1935).

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