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In order to develop the austenitic steell with the nonmagnetic characteristics, microstructures, mechanical properties, magnetic permeability and electric resistivity of Mn-Cr-Ni steels with much amount of manganese as an austenitizing element have been examined. The results obtained are as follows.It was found that composition range showing stable austenite phase lays on the higher content side of the line connecting approximately 10%Mn-10%Cr and 20%Mn-0%Cr in Mn-Cr-1%Ni phase diagram. This composition range moved to the line connecting approximately 20%Mn-10%Cr and 23%Mn-0%Cr in the case of cold-rolled steel plate. High toughness and magnetic permeability (μ) under 1.01-1.02 were obtained in the steel with complete austenite phase. Magnetic permeability markedly increased by small amount of martensite in austenite phase. Therefore, it is necessary that nonmagnetic steel have complete austenite phase. The relationship between electric resistivity (ρ) and alloying elements; manganese, chromium, nickel, silicon in austenite phase, can be written as ρ=1.27[%Mn]+0.66[%Cr]+1.62[%Ni] +5.90[%Si]+36(μΩ-cm) From the above results, 25Mn-5Cr-1Ni steel may be selected as an optimum composition from the view points of stable austenite, high toughness, nonmagnetism and suitable electric resistivity.

Microstructure, Magnetic Permeability and Electric Resistivity of High Manganese-Chromium-Nickel Steel