Metal treatment – Compositions – Heat treating
Patent
1975-10-20
1977-05-17
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
57166, 72274, 75214, 75224, 106165, 140149, 148156, 264178F, C21D 148, B21F 700, D01D 508
Patent
active
040239896
ABSTRACT:
A method for making steel wire cord from particulate iron oxides with the aid of a fiber-forming acrylic polymer is disclosed. A plurality of continuous filaments are first formed by wet-spinning an acrylic polymer spin dope in which particles of iron oxide are dispersed. The resulting filaments are drawn to increase their tenacity and then twisted to form a precursor cord. This is followed by exposing the precursor 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 by-product gases. The carbon diffuses into the resulting iron, and the individual metal particles sinter to form continuous steel wire cord having an essentially ferritic/pearlitic structure. When the product is converted to a tempered martensite structure, tensile strengths of at least 280,000 psi are attainable.
REFERENCES:
patent: 2942931 (1960-06-01), Mitchell et al.
patent: 2993018 (1961-07-01), Steinlin
patent: 3406025 (1968-10-01), Hamling
patent: 3565749 (1971-02-01), Wizon
patent: 3671228 (1972-06-01), McIntire et al.
patent: 3748119 (1973-07-01), Hwang et al.
Monsanto Company
Satterfield Walter R.
Weinkauf Russell E.
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