The forming quality of selective laser melting (SLM) is mainly determined by the compound effects of scanning strategys and process parameters. This study investigates these combined effects using two scanning strategies—line scanning and checkerboard scanning—supplemented by a remelting process. The study focuses on the influence of suitable remelting power (110 W~170 W) and remelting times (once to twice) on the molding quality of specimens. The test results indicate that within the suitable remelting power and times, the checkerboard strategy with 110 W remelting power and two remelting passes significantly improves surface quality. The corresponding test specimen achieved a relative density of 99.54%, a roughness value of 18.0 μm, a tensile strength of 1 010.2 MPa, and an elongation of 3.76%. Fracture analysis revealed that un-remelted specimens exhibited large brittle fractures, while once- and twice-remelted specimens showed ductile fracture characteristics, indicating enhanced mechanical performance. Microstructure analysis showed that specimens with 110 W remelting power and two remelting passes had uniform and dense microstructures with parallel needle-like martensite α′ phases. When remelting power was increased to 170 W and remelted twice, the specimen achieved the highest microhardness of 543.6 HV.