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 subject of the invention is a martensitic stainless steel with improved machinability, characterized in that its weight composition is the following:carbon lower than 1.2%silicon lower than or equal to 2%manganese lower than or equal to 2%chromium: 10.5.ltoreq.Cr.ltoreq.19%sulphur lower than or equal to 0.55%calcium higher than 32.times.10.sup.-4 %oxygen higher than 70.times.10.sup.-4 %the ratio of the calcium and oxygen content Ca/O being 0.2.ltoreq.Ca/O.ltoreq.0.6, the said steel being subjected to at least one quenching heat treatment to give it a martensitic structure.