Process for producing a drawn wire made of stainless steel, in particular a wire for reinforcing tires, and wire obtained by the process

A process for producing a drawn wire having a diameter of less than 0.3 mm by drawing a base wire rod having a diameter of greater than 5 mm or a predrawn base wire of a steel with the following composition by weight:

• carbon≦40×10−3%
• nitrogen≦40×10−3%,
• the carbon and nitrogen satisfying the relationship C+N≦50×10−3%,
• 0.2%≦silicon≦1.0%,
• 0.2%≦manganese≦5%,
• 9%<nickel≦12%,
• 15%≦chromium≦20%,
• 1.5%≦copper≦4%,
• sulfur≦10×10−3%,
• phosphorus<0.050%,
• 40×10−4%≦total oxygen≦120×10−4%,
• 0.1×10−4%≦aluminum≦20×10−4%,
• magnesium≦5×10−4%,
• 0.1×10−4%≦calcium≦5×10−4%,
• titanium≦50×10−4%,
• impurities inherent in the manufacture,
• in which steel the inclusions of oxides have, in the form of a glassy mixture, the following proportions by weight:
• 30%≦SiO2≦65%,
• 5%≦MnO≦40%
• 1%≦CaO≦30%,
• 0%≦MgO≦10%,
• 3%≦Al2O3≦25%,
• 0%≦Cr2O3≦10%.
• the composition satisfying the following relationship:
• when Si Mn<2%;
• IM=551−462*(C %+N %)−9.2*Si %−8.1*Mn %−13.7*Cr %−29*(Ni %+Cu %)−18.5*Mo %, with
• −150° C.<IM<−55° C., and when
• Si Mn≧2%;
• JM=551−462*(C %+N %)−9.2*Si %−20*Mn %−13.7*Cr %−29*(Ni %+Cu %)−18.5*Mo %, with
• −120° C.<JM<−55° C.,
• which base wire undergoes drawing satisfying the following drawing conditions:
• a cumulative deformation ratio ε of greater than 6,
• the wire is held, during the drawing and between the drawing operations, at a temperature of less than 650° C., without annealing between the drawing passes.