Metall. Res. Technol.
Volume 112, Number 3, 2015
|Number of page(s)||10|
|Published online||27 May 2015|
Hot-rolled strip re-reddening temperature changing law for late ultra fast-cooling in a CSP line
1 School of Mechanical Engineering,
Taiyuan University of Science and Technology, Taiyuan City, Shanxi Province, P.R. China
2 State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang City, Liaoning Province, P.R. China
3 Compact Strip Production Plant, Baotou Steel (Union) Co. Ltd., Baotou City, Neimenggu Province, P.R. China
Accepted: 24 April 2015
Higher cooling capacity is required after laminar cooling in order to develop dual-phase (DP) steel, and late ultra-fast cooling (UFC) equipment that was installed between the laminar cooling equipment and down coiler in a CSP line was developed. The strip temperature distribution along the thickness will affect the uniformity of the microstructure and properties, so in-depth research on the temperature distribution changing law during the ultra-fast cooling process should be conducted. The strip temperature was obtained by the numerical calculation method. By comparison some conclusions were obtained: the UFC re-reddening temperature decreases with an increase in the ultra-fast cooling rate and they present a quadratic relationship. The maximum temperature deviation between the center and surface, surface and boundary layer and center and boundary layer can be increased with an increase in the ultra-fast cooling rate, and they present a quadratic relationship. The finishing delivery temperature (FDT) and medium temperature (MT) do not affect the UFC re-reddening temperature obviously when the ultra-fast cooling rate is constant. There is a boundary layer along the thickness. The position of the boundary layer will remain in 1/4 strip thickness and the ultra-fast cooling rate, FDT, MT and strip thickness do not affect it. These results will provide a referenced role for the establishment of the ultra-fast cooling process.
Key words: dual-phase steel / ultra-fast cooling / UFC re-reddening temperature / maximum temperature deviation / boundary layer
© EDP Sciences, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.