Ready-to-use metal wire and method for producing same

Details Ready-to-use metal wire and method for producing same Ready-to-use metal wire and method for producing same

C - Chemistry, Metallurgy

21

D

C21D 8/06 (2006.01) C22C 38/12 (2006.01) C22C 38/18 (2006.01)

Patent

CA 2243324

A ready-to-use metal wire comprising microalloyed steel with a structure almost entirely made up of work-hardened annealed martensite is disclosed. The wire diameter is of at least 0.10 mm and at most 0.50 mm, and the ultimate tensile strength of the wire is of at least 2800 MPa. The method for producing said wire comprises shaping a drawing stock wire, performing a tempering heat treatment on the shaped wire and heating it to an annealing temperature to cause the formation of a structure almost entirely made up of annealed martensite. The wire is then cooled and shaped. Assemblies comprising at least one such wire, and wires or assemblies used in particular for reinforcing tyre casings, are also disclosed.

Fil métallique prêt à l'emploi comportant un acier microallié qui présente une structure constituée pratiquement en totalité de martensite revenue écrouie. Le diamètre du fil est au moins égal à 0,10 mm et au plus égal à 0,50 mm. La résistance à la rupture du fil est au moins égale à 2800 MPa. Procédé pour produire ce fil cmportant une déformation d'un fil machine, un traitement thermique de trempe sur le fil déformé et un chauffage à une température de revenu pour provoquer la formation d'une structure constituée pratiquement en totalité de martensite revenue. On refroidit ensuite le fil et on le déforme. Assemblages comportant au moins un tel fil, ces fils ou assemblages étant utilisés en particulier pour renforcer des enveloppes de pneumatiques.

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