高 Mn-Cr 鋼の組織, 低温靱性および熱膨張率について

概要

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In order to develop the austenitic steel for cryogenic use, micro structure, mechanical properties especially low temperature toughness, and thermal expansion coefficient of manganese-chromium steels with much amount of manganese as an austenitizing element, have been investigated. The results obtained are as follows. It is found that 25 Mn-5Cr-1Ni steel, selected as optimum base composition, has excellent notch toughness and low thermal expansion coefficient of 6.7∿7.2×10^<-6>/℃. Further the addition of niobium, vanadium and titanium to base composition result in the refinement of austenite grain size which increase the strength considerably but decrease the notch toughness a little. Especially the addition of 0.1% niobium contribute to the high tensile strength of 70kg/mm^2 and keep the low temperature toughness _νE_<-196> more than 5 kgm. The addition of nitrogen increases only the 0.2% proof strength.
社団法人日本鉄鋼協会の論文
1975-03-01