Method for making steel wire

Details Method for making steel wire Method for making steel wire

1975-10-20

1978-08-01

Hunt, Brooks H.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

75207, 75DIG1, 75229, 428602, 428568, 428577, 4285395, B22F 300, B22F 100

Patent

active

041044452

ABSTRACT:
A method for making filamentary steel wire from particulate iron oxides with the aid of a fiber-forming acrylic polymer is disclosed. A precursor filament is first formed by wet-spinning an acrylic polymer spin dope in which particles of iron oxide are dispersed. The resulting precursor filament is then exposed to a reducing atmosphere (e.g., a gaseous mixture of hydrogen and carbon monoxide) at a temperature in the range of from about 900.degree. C. to 1150.degree. C. for a period of about 3 to 8 minutes. Under these conditions, the iron oxide particles are reduced to the metallic state and the polymer in the precursor is pyrolized to carbon and byproduct gases. The carbon diffuses into the resulting metallic iron, and the individual metal particles sinter to form continuous steel wire.
The method has the capability of producing steel wire of an essentially ferritic/pearlitic structure with a tensile property in excess of 140,000 psi. When the product is converted to a tempered martensite structure tensile strengths exceeding 260,000 psi are achievable.

REFERENCES:
patent: 3529044 (1970-09-01), Santangelo
patent: 3671228 (1972-06-01), McIntire et al.
patent: 3697262 (1972-10-01), Fenner

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