Process for the manufacture of a material made of steel, in which a steel powder is subjected to a consolidation process, which is an additive manufacturing process, in order to form the material or to a coating process in order to coat a support with a coating comprising the material, the powder being formed of particles which comprise a matrix in which precipitates are incorporated, the chemical composition of the powder being such that: i) the powder comprises, as percentage by weight, the following elements: - 16% to 20% of chromium, - 8% to 14% of nickel, - 0.001% to 0.030% of carbon, - 0.001% to 0.050% of oxygen, - 0% to 2% of manganese, - 0% to 3% of molybdenum, - 0% to 1% of silicon, - 0% to 0.11% of nitrogen, - 0% to 0.045% of phosphorus, - 0% to 0.05% of sulphur, - 0% to 0.0300% of aluminium, - 0% to 2% of manganese, - 0% to 3% of molybdenum, - 0% to 0.003% of vanadium, - 0% to 0.02% of cobalt, - 0% to 0.02% of titanium - 0% to 0.02% of copper, - the remainder of these elements being constituted of iron; ii) the precipitates comprise at least one metal element chosen from a metal element M, a metal element M', a metal element M" or their mixtures; the metal elements being chosen, independently of one another, from yttrium, titanium, iron, chromium, tungsten, silicon, zirconium, thorium, magnesium, manganese, aluminium, hafnium, molybdenum or their mixtures; the mean density with which the precipitates of the powder are distributed in the matrix being of between 2 precipitates/μm 3 and 100 precipitates/μm 3, said mean density being determined by counting via imaging by Scanning Electronic Microscopy or by Transmission Electron Microscopy, the microstructure of the steel being such that the grains are equiaxial and the mean size of the grains, measured according to Standard ASTM E112-10, being such that the mean of their greatest dimension "Dmax" and/or the mean of their smallest dimension "Dmin" is of between 10 μm and 50 μm. i) the powder comprises, as percentage by weight, the following elements: - 16% to 20% of chromium, - 8% to 14% of nickel, - 0.001% to 0.030% of carbon, - 0.001% to 0.050% of oxygen, - 0% to 2% of manganese, - 0% to 3% of molybdenum, - 0% to 1% of silicon, - 0% to 0.11% of nitrogen, - 0% to 0.045% of phosphorus, - 0% to 0.05% of sulphur, - 0% to 0.0300% of aluminium, - 0% to 2% of manganese, - 0% to 3% of molybdenum, - 0% to 0.003% of vanadium, - 0% to 0.02% of cobalt, - 0% to 0.02% of titanium - 0% to 0.02% of copper, - the remainder of these elements being constituted of iron; - 16% to 20% of chromium, - 8% to 14% of nickel, - 0.001% to 0.030% of carbon, - 0.001% to 0.050% of oxygen, - 0% to 2% of manganese, - 0% to 3% of molybdenum, - 0% to 1% of silicon, - 0% to 0.11% of nitrogen, - 0% to 0.045% of phosphorus, - 0% to 0.05% of sulphur, - 0% to 0.0300% of aluminium, - 0% to 2% of manganese, - 0% to 3% of molybdenum, - 0% to 0.003% of vanadium, - 0% to 0.02% of cobalt, - 0% to 0.02% of titanium - 0% to 0.02% of copper, - the remainder of these elements being constituted of iron; ii) the precipitates comprise at least one metal element chosen from a metal element M, a metal element M', a metal element M" or their mixtures; the metal elements being chosen, independently of one another, from yttrium, titanium, iron, chromium, tungsten, silicon, zirconium, thorium, magnesium, manganese, aluminium, hafnium, molybdenum or their mixtures; the mean density with which the precipitates of the powder are distributed in the matrix being of between 2 precipitates/μm 3 and 100 precipitates/μm 3, said mean density being determined by counting via imaging by Scanning Electronic Microscopy or by Transmission Electron Microscopy, the microstructure of the steel being such that the grains are equiaxial and the mean size of the grains, measured according to Standard ASTM E112-10, being such that the mean of their greatest dimension "Dmax" and/or the mean of their smallest dimension "Dmin" is of between 10 μm and 50 μm. the mean density with which the precipitates of the powder are distributed in the matrix being of between 2 precipitates/μm 3 and 100 precipitates/μm 3, said mean density being determined by counting via imaging by Scanning Electronic Microscopy or by Transmission Electron Microscopy, the microstructure of the steel being such that the grains are equiaxial and the mean size of the grains, measured according to Standard ASTM E112-10, being such that the mean of their greatest dimension "Dmax" and/or the mean of their smallest dimension "Dmin" is of between 10 μm and 50 μm.