Abstract: To investigate the effects of sintering temperature and atmosphere on the density, microstructure, and mechanical properties of 430L stainless steel, bulk materials were prepared at 1150 ℃, 1270 ℃, and 1310 ℃ by vacuum sintering and N/H atmosphere sintering processes. The results show that the porosity continuously decreases with the increase of the temperature, and the density and elongation of the samples gradually improve. However, the tensile strength first increases and then decreases due to the continuous growth of ferrite grains and obvious coarsening of second-phase particles. Compared with bulk materials sintered in N/H atmosphere, sintered under vacuum at the same temperature show higher density and elongation, but slightly lower tensile strength. The 430L stainless steel prepared by vacuum sintering at 1270 ℃ exhibits the best comprehensive performance, with a bulk density of 7.29 g/cm3, a tensile strength of 427 MPa, and an elongation of 21.6 %.