Designing ultrastrong maraging stainless steels with improved uniform plastic strain via controlled precipitation of coherent nanoparticles

•A novel ultrastrong MSS with ultimate tensile strength above 2.0 GPa was developed.•This MSS composition was designed via a cluster formula approach.•It has a coherent microstructure with ultrafine B2 nanoprecipitates in BCC matrix.•The uniform elongation (4.2%−5.1%) is almost triple of the value in existing MSSs.•The origins of ultrahigh strength and large uniform plastic strain were discussed.