低熱膨張高マンガン非磁性鋼RM801FWの諸特性について

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A study was made in order to clarify the properties of high manganese non-magnetic steel RM801FW (0.6%C-24.5%Mn-6%Cr-Fe), which has recently been developed as structural steel. Mechanical and physical properties, machinability and weldability were investigated. The results obtained are as follows:(1) 0.2% proof stress of RM801FW is 35.2kg/mm2 in solution annealed condition and also has good ductility.(2) Electrical resistivity of RM801FW is about five times larger than carbon steel. Mean thermal expansion coefficient of RM801FW at the temperature range between 0 and 100°C is 12.1×10-6/°C, which is as large as carbon steel and is about 30% smaller than SUS304 and conventional high manganese non-magnetic steel RM711 (0.7%C-15%Mn-1%Ni-Fe).The low thermal expansion coefficient of RM801FW can be understood by invar effect of antiferromagnetism.Permeability of RM801FW does not increase by cold working, showing more stable FCC austenite than SUS304 and conventional high manganese steel RM711.(3) RM801FW has good machinability compared with conventional high manganese steel RM711 and good weldability.(4) Corrosion resistance of RM801FW is superior to carbon steel and conventional high manganese steel RM711.