US 12,084,749 B2
Process for the manufacture of an optimised steel material
Hicham Maskrot, Montlhery (FR); Aziz Chniouel, Cavaillon (FR); Fernando Lomello, Gif-sur-Yvette (FR); Pierre-François Giroux, Antony (FR); and Pascal Aubry, Paris (FR)
Assigned to COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
Filed by COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES, Paris (FR)
Filed on Nov. 6, 2020, as Appl. No. 17/091,540.
Claims priority of application No. 19 12533 (FR), filed on Nov. 7, 2019.
Prior Publication US 2021/0138543 A1, May 13, 2021
Int. Cl. C22C 33/02 (2006.01); B22F 1/054 (2022.01); B22F 10/00 (2021.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01)
CPC C22C 33/0285 (2013.01) [B22F 1/054 (2022.01); B22F 10/00 (2021.01); B22F 2301/35 (2013.01); B22F 2304/054 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B33Y 80/00 (2014.12)] 30 Claims
OG exemplary drawing
 
1. A process for manufacturing a steel material, the process comprising:
consolidating a steel powder, thereby forming the steel material; or
coating a support with the steel powder, thereby producing the support coated with a coating comprising the steel material,
wherein the steel powder comprises particles comprising a matrix and precipitates incorporated into the matrix, the precipitates being distributed in the matrix with an average density in a range of from 2 to 100 precipitates/μm3,
wherein (i) the matrix of the steel powder has a 316L steel composition according to ASTM A666 standard and comprises, as a weight percentage:
16.0 to 18.0% of chromium;
10.0 to 14.0% of nickel;
0.001 to 0.030% of carbon;
0.001 to 0.050% of oxygen;
0 to 2.0% of manganese;
2.0 to 3.0% of molybdenum;
0 to 0.75% of silicon;
0.10% or less of nitrogen;
0.045% or less of phosphorus;
0.030% or less of sulfur;
0 to 0.0300% of aluminum;
0 to 0.003% of vanadium; and
iron,
wherein (ii) the precipitates comprise a metallic element M, a metallic element M′, and/or a metallic element M″,
wherein each of the metallic elements M, M′, and M″, if present, is selected from the group consisting of yttrium, titanium, iron, chromium, tungsten, silicon, zirconium, thorium, magnesium, manganese, aluminum, hafnium, molybdenum, and a mixture thereof, and
wherein the matrix of the steel material microstructure consists of equiaxed grains having an average grain size in a range of from 10 μm to 50 μm at a largest dimension Dmax and a smallest dimension Dmin, and
wherein the equiaxed grains have a Dmax/Dmin ratio of the largest dimension Dmax to the smallest dimension Dmin of a grain in a range of from 1 to 2.