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High-strength, low-alloy (HSLA) steels, although known for years, are not very popular in the industry. Controlled thermo-mechanical rolling poses significant challenges for process engineers and is only feasible in a few rolling mills worldwide. An example is the Krakow Hot Rolling Mill of ArcelorMittal Poland S.A., where such steels can be produced. When designing a process for the production of HSLA steels, it is extremely important to know the temperature at which the recrystallization stops (so called recrystallization stop temperature, RST) - the process should be carried out in such a way that the last passes are already below this temperature, and at the same time care should be taken to ensure that the transformation from austenite to ferrite is close to this temperature - the rolling should take place entirely in the single-phase range. In this study, the authors analysed the current production process in Krakow, Poland, with a view to the occurrence of a recrystallisation stop temperature. The equations available in the literature to calculate the RST were also analysed. The work is an important contribution to improving the design process of HSLA steel production at the Krakow rolling mill.
Keywords: HSLA steels, recrystallization, RST, NRT, thermomechanical rolling© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.