Hot Deformation Behavior And Heat Treatment Technology Of 23MnNiMoCr54

23MnNiMoCr54, as a widely used mechanical chain steel, is made domestically now, but the performance of domestic 23MnNiMoCr54 steel is often unstable. In or der to solve this problem, the mining chain 23 MnNi MoCr54 steel of Nanjing Iron and Steel Corporation production was studied in this paper. Through the experiment,the overcooling austenite continuous cooling curve of the steel was established, the dynamic recrystallization and high temperature deformation behavior of the steel was studied. The electronic structure and mechanical properties of the alloy electronic struct ure were studied. to obtain stable and satisfying mechanical properties. The quenchin g and tempering process of the steel was optimized by orthogonal design And Final ly, the influence of the field finishing process on the properties and stability of the steel was studied. Research results show that:(1). There were three major changes in over cooled austenite during continuous cooling Transformation of this steel. Ferrite transformation occurs at high temperature region of 650 ? to 580 ? when the cooling rate of <0.5 ?/s. The bainite transformation occurred in the middle temperature zone between 575 ? and 365 ? and the range of bainite transformation is larger when the cooling rate reached 10 ? /s, it would be completely transformed into martensite.(2). The single pass compression tests of the steel were carried out by the thermal simulation machine. The stress-strain curves at high temperature deformation were studied. The constitutive equations of hot deformation at high temperature were obtained. At the same time, the dynamic recrystallization behavior of the steel was studied and the relationship between the peak strain of dynamic recrystallization and the Z parameters was determined.(3). From electronic structure level of the steel alloy 400 ? ~ 500 ? tempering alloy structural unit in the process of change and experimental theoretical study is made on the change of steel mechanical properties, it is concluded that the performance of microstructure changes factors in the process of tempering.(4). Through the research on the heat treatment process of the experimental steel When the quenching heating temperature was 900 ?, insulation for 30 min. and the tempering treatment was 400 ?, insulation for 60 min, the steel could obtain a stable and good mechanical properties.(5). After comparing and analyzing the performance of two kinds of annealing furnace in the production. There is a large difference in performance between the production of the car type annealing furnace and the roller hearth annealing furnace. It is determined that the annealing furnace can be used as the final heat treatment to provide good organizational preparation, to further improve the performance of the steel to lay the foundation.