Cold drawn low carbon steel filament and method of manufacturing said filament
AssigneeNV Bekaert SA
InventorsJavier Del Río Rodriguez, Dirk Meersschaut
Life of this patent
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Abstract
A steel filament adapted for the reinforcement of elastomer or for thermoplastic products has a carbon content ranging up to 0.20 per cent by weight. The steel filament is provided with a coating promoting the adhesion with elastomer or thermoplastic products. The steel filament is drawn until a final diameter of less than 0.60 mm and a final tensile strength of more than 1200 MPa. Intermediate heat treatments are avoided so that the carbon footprint of the steel filament is substantially reduced.
Claims14
A steel filament adapted for the reinforcement of elastomer products,
- said steel filament consisting of iron, a plain carbon composition with a carbon content ranging up to 0.20 percent by weight, a silicon content below 1.0 percent by weight, a manganese content below 2.0 percent by weight, amounts of chromium, copper, nickel, and molybdenum are limited to 0.20 percent by weight, amounts of phosphorus and sulfur are limited to 0.030 percent by weight, and a nitrogen content is limited to 0.015 percent by weight, said plain carbon composition having mainly a ferrite or pearlite matrix, wherein there are no martensite phases or bainite phases,
- said steel filament being provided with a coating promoting the adhesion with elastomer products or with thermoplastic products,
- said steel filament being cold drawn until a final diameter of less than 0.60 mm,
- said steel filament having a final tensile strength of more than 1200 MPa.
A method for manufacturing a steel filament adapted for the reinforcement of elastomer products, said method comprising the following steps:
- a. providing a steel wire rod consisting of iron, a plain carbon composition comprising a carbon content up to 0.20 percent by weight, a silicon content below 1.0 percent by weight, a manganese content below 2.0 percent by weight, amounts of chromium, copper, nickel, and molybdenum are limited to 0.20 percent by weight, amounts of phosphorus and sulfur are limited to 0.030 percent by weight, and a nitrogen content is limited to 0.015 percent by weight, said plain carbon composition having mainly a ferrite or pearlite matrix, wherein there are no martensite phases or bainite phases;
- b. drawing said steel wire rod directly to a steel wire with an intermediate diameter;
- thereby avoiding any intermediate heat treatments such as patenting;
- c. providing said steel wire with a coating promoting the adhesion with elastomer products;
- d. further drawing said coated steel wire to a steel filament with a final diameter below 0.60 mm and to a tensile strength exceeding 1200 MPa.
Dependencies are inferred from the claim text.