Abstract: Ferritic stainless steel which can be used for the production of steel wool, whose composition by weight is the following:carbon.ltoreq.0.2%,silicon.ltoreq.2%,manganese.ltoreq.2%,11%.ltoreq.chromium.ltoreq.30%,nickel.ltoreq.1%,sulfur.ltoreq.0.030,calcium.gtoreq..times.10.sup.-4 %,oxygen.gtoreq.40 .times.10.sup.-4 %,the calcium and oxygen contents satisfying the following relationship:0.2.ltoreq.Ca/O.ltoreq.0.7.

Abstract: The present invention relates to a resulfurized austenitic stainless steel with improved machinability, and which is especially useful in the field of machining at high cutting speed and in the field of bar turning.

Abstract: Ferritic stainless steel with improved machinability, which can be used especially in the field of screw machining, characterized by the following composition:C<0.17%Si<2.0%Mn<2.0%Cr[11-20] %Ni<1.0%S.ltoreq.0.55%Ca>30.times.10.sup.-4 %O>70.times.10.sup.-4 %the Ca/O ratio, between the calcium content and the oxygen content, being given by 0.2<Ca/O<0.6, the said steel being subjected, after rolling and cooling, to an annealing heat treatment giving it a ferritic structure.

Abstract: The invention concerns a strip or sheet of ferritic stainless steel of the following composition (% by weight):(C+N)<.060;Si<0.9;Mn<1;Cr=15 to 19;Mo<1;Ni<0.5;Ti<0.1;Cu<0.4;S<0.02;P<0.045;Zr=0.10 to 0.40, and 7(C+N).ltoreq.Zr.ltoreq.7(C+N)+0.15;Nb=0.25 to 0.55, in non-combined form;Al=0.020 to 0.080;Fe=the balance,in which Al is essentially in solid solution.The process for the production of the sheet or strip comprises a final annealing operation which is carried out at between 980.degree. and 1020.degree. C., typically for 0.5 to 5 minutes at between 990.degree. and 1010.degree. C.The strip or sheet according to the invention is used for any application requiring an economic compromise in regard to ductility (sheet and welds), hot resistance and resistance to corrosion, for example in motor vehicle exhaust manifolds.