Abstract
For an examination of cooling characteristics of hot steel sheets cooled by water films, tests were conducted on a model cooling apparatus and an actual run-out table in the hot strip mill at Kobe Steel's Kakogawa Works and led to the following conclusions:
(1) Cooling capacity along a “stagnation line” created by the water film is nearly constant at a water flow rate of 0.3 to 0.9m3/min·m.
(2) Cooling capacity of “stagnation region” is reduced by “mixing region” that exists near the water film.
(3) At a steel temperature range of 750-800°C, the effects of nozzle height and slit gap on cooling capacity are negligible.
(4) Cooling tests of high temperature steel (730-860°C) on the run-out table demonstrate no difference in cooling capacity between this method, which uses water films, and the conventional one which uses water bars.
