The invention discloses a preparation method of high-
manganese non-magnetic steel
powder. The preparation method comprises the following steps that (1), steel
scrap of plain
carbon steel and
steelmaking pig iron are taken as raw materials, and secondary materials are added for
smelting; (2), refining is carried out after the steel is smelted,
metal manganese and
ferrosilicon are added, and pre-alloying treatment and deoxidation treatment are carried out; (3), high-pressure atomization,
dehydration and
drying treatment are carried out on the refined steel to prepare primary
powder; and (4), high-temperature reduction, crushing and sieving treatment are carried out on the primary
powder to obtain the high-
manganese non-magnetic steel powder. According to the preparation method, the plain
carbon steel scrap steel and the
pig iron are used as the raw materials, the high-manganese non-magnetic steel powder with proper loose packing density and good pressing performance is prepared by adopting a water atomization method, and the method is suitable for production of high-density and high-strength
powder metallurgy non-magnetic structural parts.