Determination of rheological analogy of lead and steel for flat hot-rolled products

Authors

  • В.В. Кухар ДВНЗ «Приазовський державний технічний університет», Маріуполь, Україна Author
  • О.Г. Курпе ДВНЗ «Приазовський державний технічний університет», Маріуполь, Україна Author

DOI:

https://doi.org/10.33271/crpnmu/61.153

Keywords:

physical modeling, proportionality coefficients, true strain resistance, hot rolling, steel grades

Abstract

Purpose. Search for conditions and steel grades of various purposes, including those produced by the method of thermomechanical rolling, which properties are similar to lead as a material-analogue, for its further implementation in physical modeling. Research methods. In the paper, by upsetting, in laboratory conditions, the properties of lead samples have studied at a degree of deformation from 0.1 relative units to 0.54 relative units. According to the results of the experiment, the parameters of the samples have been determined, and the true strain resistance has been calculated. Comparative analysis of properties has been made and the list of steel grades (alloy) - analogues and conditions (deformation temperature 1200 ℃, deformation rates u = 1 c -1, deformation degree from 0.1 relative units to 0.54 relative units) under which they are close to the properties of lead has been determined. Findings. The polynomial dependences of true strain resistance on the degree of deformation for lead, as well as for alloy 0X18MFT and steel grades - analogues 15X25T, DD11, 65G, X80, X70, St3sp, with corresponding magnitude of approximation probability from 0.992 to 0.998 have been obtained. The proportionality coefficients have been calculated by which the results of further experiments on rolling lead samples can be converted to the corresponding steel grade (alloy) - analogue. Scientific originality. Expansion of possibilities for physical modeling has been performed within the temperature range from 1200 ℃ to 1000 ℃, which corresponds to most modes of processing of modern steel grades during roughing rolling, by introducing the coefficient of change of the true deformation resistance Kσ and developing dependences for calculation for each steel grade (alloy) - analogue. Practical implications. The verification of the obtained results has been performed based on the actual data of the thick plates roughing rolling results on the mill 3600 AZOVSTAL IRON & STEEL WORKS with final dimensions of 17.5×3268×12200 mm of steel grade X70. When comparing the actual data with the data calculated on the basis of the obtained proportionality coefficients and the coefficients of change of the true deformation resistance, the average error is 11.6 %, which allows to use the obtained data for further physical modeling of hot rolling processes.

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Published

2020-01-01

Issue

No. 61 (2020)

Section

Статті

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