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US 6,418,994 B1Granted
Tire having a stainless steel carcass reinforcement
AssigneeMichelin Recherche et Technique S.A.
InventorsJean-Claude Arnaud, Christian Lamoureux, Eric Depraetere
Life of this patent
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Abstract
The present invention provides a stainless steel wire for a carcass of a tire and a process for making such a wire. The wire comprises at least 0.02% and at most 0.2% carbon, at least 3% and at most 20% nickel, at least 12% and at most 28% chromium, the sum of the nickel and chromium being at least equal to 20% and at most 35% (% in weight). The structure of the steel comprises at least 20% in volume of martensite and it is devoid of austenite or it comprises less than 80% of it in volume.
Claims21
A tire having a carcass reinforcement comprising at least a steel wire, wherein
- said steel wire has a diameter equal to at least 0.05 mm and at most 0.5 mm, and has a tensile strength of at least 2000 MPa;
- the wire has a ductility in torsion at least equal to 30 twists;
- the steel of the wire is stainless steel comprising by weight at least 0.02% and at most 0.2% carbon, at least 3% and at most 20% nickel, at least 12% and at most 28% chromium, the sum of the nickel and chromium being at least equal to 20% and at most equal to 35%;
- and
- the structure of the steel of the wire is at least 20% by volume martensite and less than 80% by volume austenite.
2 more elements
Dependencies are inferred from the claim text.