高 Mn-Cr-Ni 鋼の組織, 透磁率および電気抵抗について

概要

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In order to investigate the austenitic steel with the non-magnetic characteristics, microstructures, mechanical properties, magnetic permeability and electric resistivity of manganese-chromium-nickel 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 10Mn-10Cr and 20Mn-0Cr in Mn-Cr-1%Ni phase diagram. This composition range moved to the line connecting approximately 20Mn-10Cr and 23Mn-0Cr 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 element ; 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, non-magnetism and suitable electric resistivity.
1979-08-01