The effect of temperature on the mechanical characteristics of the nitrogen-containing 04Kh20N6G11M2AFB steel under static tension

The paper describes a complex of research on the study of the mechanical properties, fractographic features of the fracture and evolution of the structure of the nitrogen-containing stainless steel 04Kh20N6G11M2AFB (0.47 wt. % N) with an austenitic structure under static tension at temperatures ranging between −70 and +140 °C. A new effect has been revealed, namely, a more intensive growth of the strength characteristics with a simultaneous increase in the plasticity characteristics of the 04Kh20N6G11M2AFB steel under static tension at temperature decreasing in the range between +50 and −70 °C as compared with strengthening rate and plasticity characteristics at temperature decreasing in the range between +140 and +50 °C. It has been found that the ductile nature of fracture still prevails for the steel 04Kh20N6G11M2AFB at tensile testing temperatures decreasing to −70 °C, and this corresponds to the lower boundary of the range of negative climatic temperatures.