Back to results
US 4,104,445 AGranted
Method for making steel wire
AssigneeMonsanto Company
InventorEmerick J. Dobo
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeMonsanto Company
InventorEmerick J. Dobo
Estimating the term…
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.
A method for producing filamentary steel wire wherein particles of iron oxide are combined with a fiber-forming acrylic polymer to first form a precursor filament which is then converted to steel wire, said method comprising the following steps in sequence:
A method for producing filamentary steel wire wherein particles of iron oxide are combined with a fiber-forming acrylic polymer to first form a precursor filament which is then converted to steel wire, said method comprising the following steps in sequence:
A method for producing filamentary steel wire from particles of iron oxide with the aid of a fiber-forming acrylic polymer, said method comprising the following steps in sequence:
A synthetic filament which is convertible to filamentary steel wire when exposed to a reducing environment at temperatures in the range of from about 900.degree. C. to 1150.degree. C. for a period of from 3 to 8 minutes, said synthetic filament comprising a mixture of iron oxide particles and an acrylic polymer in a weight ratio of from about 3:1 to 7:1, respectively.
A filamentary steel wire product obtained from the reduction, carbonization and sintering of iron oxide particles which has a tensile strength of at least 140,000 psi, said steel wire product being further characterized by an essentially ferritic-pearlitic structure and a carbon content of from about 0.6 to 0.8 percent by weight.
A filamentary steel wire product having a carbon content in the range of from about 0.6 to 0.8 percent by weight which has been obtained from the reduction, carbonization and sintering of iron oxide particles and thereafter converted to a tempered martensite structure, said steel wire product being characterized by a tensile strength of at least 260,000 psi.
A method for producing filamentary steel alloy wire wherein a mixture of metal oxide particles consisting of iron oxide and one or more other metal oxides capable of being reduced and sintered at conditions effective for accomplishing a reduction and sintering of iron oxide are combined with a fiber-forming acrylic polymer to first form a precursor filament which is then converted to steel alloy wire, said method comprising the following steps in sequence:
Dependencies are inferred from the claim text.