Research of Properties of Cast Austenitic Steels for Low-temperature Equipment

Abstract

This paper considers the possibility of using Cr-Ni, Cr-Ni-Mn and Cr-Mn cast metastable austenitic steels with alloying systems of the grades 12Cr18Ni10TiL, 10Cr14Mn14Ni4TiL and 10Cr14NMn20L for the manufacture of complex-shaped parts for use in equipment operated at low temperatures. The results of tests to assess the characteristics of strength, ductility and toughness of austenitic steels in the cast state in the temperature range from plus 20 to minus 196 ° C are presented. The obtained data allow us to estimate the change in the values of the mechanical properties of cast asutenite steels with decreasing test temperature. Based on the analysis of the results obtained, recommendations were given on the use of austenitic steels in a cast state for low-temperature equipment at various operating temperatures. It is shown that metastable austenitic steel 10Cr14NMn20, in comparison with other studied steels, despite relatively low values of plasticity, has higher values of strength and toughness at mines 196 ° C and can be recommended for the manufacture of cast parts of low-temperature equipment.