GB/T 42668-2023 "Samarium Iron Nitrogen Bonded Permanent Magnet Powder" specifies the classification, grade technical requirements, test methods, inspection rules, Encasement, marking, transportation, storage and accompanying documents of samarium iron nitrogen bonded permanent magnet powder. This standard applies to isotropic and anisotropic samarium iron nitrogen bonded permanent magnet powder, which can be used for molding processes such as molding, injection molding, extrusion and calendering to manufacture bonded magnets. The terms and definitions contained in the standard are based on GB/T 9637 and GB/T 15676, and refer to a number of relevant standards, such as Particle size distribution laser diffraction method, requirements for fast-quenched NdFeB permanent magnet powder, and temperature coefficient measurement method of magnetic energy of permanent magnet materials.