Steel rolling using optimized rolling schedule

Details Steel rolling using optimized rolling schedule Steel rolling using optimized rolling schedule

B - Operations, Transporting

21

B

80/51

B21B 1/06 (2006.01)

Patent

CA 1280015

ABSTRACT OF THE DISCLOSURE This invention is the process of rolling microalloyed steel in accordance with a rolling schedule determined as follows: A series of termomechanical workings such as temperature-controlled torsional strains are applied to a specimen of the steel at strain and temperature levels and interpass times selected to simulate rolling mill conditions. The measured stress values are compared with the temperatures of the steel during the working periods during which the respective values were obtained. Changes in the character of the functional relationship between stress and termperature values enable a determination of the upper limit Ar3 of the austenite-ferrite transformation temperature range. Thermomechanical working schedules are repeated at selected varying starting and terminating temperatures thereby to obtain a series of possible rolling schedules. These simulations are selected so that a varying number of reduction passes in the sequence occur at steel temperatures below temperature Ar3. The value of a selected parameter of the worked steel, e.g. yield strength, is measured at ambient temperature. From the rolling mill analogue of possible rolling schedule simulations, and using linear regression analysis, an optimized rolling schedule is selected which will predictably impart to the steel a value of the selected parameter falling within a predetermined range.

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