Effect of Anneal Temperature on Microstructure and Mechanical Properties of 0Cr21Ni6Mn9N cold Drawn Pipe

Abstract

Abstract. The microstructure and mechanical properties of 0Cr21Ni6Mn9N austenitic stainless steel cold drawn pipe were investigated at various annealing temperatures. It was found that the tensile strength and the yield strength increased slightly, and then decreased with the temperature increasing from 200 to 750 °C. The highest value of tensile strength and yield strength reached 1062 and 942MPa at 600 °C, respectively. However, the elongation has an opposite trend to the tensile strength and yield strength. The microstructure evolution of the cold drawn pipe annealed at different temperatures was observed. The results indicate that when annealed below 550 °C, recovery is dominant. At 550 °C, it is recovery and partial recrystallization. Over 550 °C, complete recrystallization has likely occurred. Moreover, the Cr 2 N particles near the grain boundaries were found, and the amount of precipitates along the grain boundary indexed as M 23 C 6 were increasing at 650-800 °C.

Effect of Annealing Temperature on Microstructure and Properties of Cold Drawn Tube

“…In this paper, the mechanical properties testing, microstructure observation and fracture features analysis of the investigated cold drawn tube were carried out, and the optimal annealing process parameters are obtained. On the basis of previous research [6,7], the annealing temperature for eliminating internal stress of the cold drawn tube should be kept as 50°C-200°C lower than recrystallization temperature, so 5 different annealing processes have been designed reasonably for eliminating internal stress. According to the production practice and theoretical analysis, the samples were heated to different temperatures (430℃, 450℃, 470℃, 490℃ and 510℃) in annealing furnace, and kept at these temperatures for 3h.…”