Abstract: In order to eliminate nonequilibrium segregation of manganese at grain boundaries and increase low temperature toughness, the research work of improving heat treatment process and adding alloying elements are taken. The nonequilibrium segregation of manganese are eliminated by decreasing solution treating temperature and cooling rate and adding chromium, boron and molybdenum, thus, the low temperature toughness of high manganese austenitic steels are improved.

Key words: Cryogenic steel, High manganese steel, Low temperature toughness, Nonequilibrium segregation