RESEARCH OF PLASTIC RESISTANCE OF STEEL 32CrMn
DOI:
https://doi.org/10.14529/met200109Keywords:
softening, microstructure, plastic deformation, metal resistanceAbstract
The value of metal resistance to plastic deformation is an important aspect in the design and calculation of metal processing. Despite this, there are many calculation methods today, the calculation results for which can differ significantly from each other. Also, the values of empirical coefficients used for calculation were determined and published not for all grades of steel. Moreover, the calculation methods and published values of the numerical coefficients are different for the processes of cold and hot deformation. The temperature range from 300 to 600 °C remains the least studied. This article is concerned with the study of the plastic deformation resistance of 32CrMn (32ХГА) steel, taking into account its functional properties, and continues a series of articles based on the results of the studies by the authors. The choice of this steel grade is due to the fact that it is widely used in the production of seamless pipes for the oil and gas industry. This study was carried out according to a unified method for the temperature range from room temperature to temperatures close to the melting point. This allows one to use the obtained results in calculating all possible technological operations for the production of pipes, including pipe straightening in the heat sections of pipe rolling plants, and moulding longitudinal welded pipes.
A series of tests was conducted on the Gleeble 3800 complex to determine the numerical values of the coefficients characterizing the steel grade under consideration. The values of the coefficient characterizing the softening of the metal were determined from the obtained curves of deformation resistance for the temperature range from 300 to 1200 ° C. A recurrence dependence that allows one to calculate the value of deformation resistance taking into account softening in a wide temperature range was obtained from the test results.
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