Patent ID: 7128790

Claim:
A process for producing a rolled bar, rod, plate or sheet made of iron-cobalt alloy, characterized in that said alloy comprises, in percentages by weight: from 10 to 20% of Co; from traces to 2.5% of Si; from traces to 2% of Al; from 0.1 to 1% of Mn; from traces to 0.0100% of C; a sum of the O, N and S contents of between traces and 0.0070%; a sum of the Si, Al, Cr, V, Mo and Mn contents of between 1.1 and 3.5%, preferably between 1.5 and 3.5%; a sum of the Cr, Mo and V contents of between traces and 3%; a sum of the Ta and Nb contents of between traces and 1%; the balance being iron and impurities resulting from the smelting, in that 1.23(Al+Mo)%+0.84(Si+Cr+V)%−0.15(Co%−15)≦2.1, in that 14.5(Al+Cr)%+12(V+Mo)%+25Si%≧21, preferably ≧40, in that the bar, rod or plate has preferential <100> axis fiber texture deviating by less than 20° with respect to a hot rolling direction, for at least 30% (by volume of the material), preferably for at least 50%, of the grains wherein the rolled bar, rod, plate or sheet is produced from a blank made of said alloy by carrying out a rolling operation starting in the austenitic phase and finishing in the ferritic phase with a deformation ratio in the ferritic phase of at least 30%, and in that an optional subsequent annealing treatment is carried out at a temperature below the austenitic transformation temperature.