PROCESS ENGINEERING MEASURES IN A CONTINUOUS CASTING MACHINE AT THE START OF CASTING, AT THE END OF CASTING AND WHEN PRODUCING A TRANSITIONAL PIECE

摘要

A method for operating a continuous casting machine (1) at the start of casting, at the end of casting and when producing a transitional piece (21) for improving the quality of the ends of the strand (16, 18), and protecting the machine from damage. At the start of casting, perform the following additional method steps: recording a position of the beginning of the strand (16) in the strand guide (4); after the beginning of the strand (16) and after an upper end (17a) of the beginning region of the strand (17), has passed a pair of adjustable strand guiding rollers (5) adjusting the roller pair to touch the strand (2); cooling the beginning region of the strand (17) by the cooling nozzle (10) delivering an amount of coolant Q less than a nominal amount of coolant Qnom to the beginning region of the strand (17); and cooling the main part of the strand (20) by the cooling nozzle (10) delivering an amount of coolant Q that is substantially equal to Qnom to the main part of the strand (20).

主权项

1. A method for operating a continuous casting machine at the start of casting, wherein
the continuous casting machine comprises a mold; a strand guide comprising at least one pair of adjustable strand guiding rollers and at least one cooling nozzle; the method comprises the steps in sequence of: introducing a dummy bar with a dummy bar head into the continuous casting machine; holding the dummy bar in the strand guide, wherein the dummy bar head is located and configured for closing off the mold in a fluid-tight manner; starting casting using the continuous casting machine, comprising pouring liquid steel into the mold forming an at least partially solidified strand comprising in a casting direction: a beginning of the strand, a following beginning region of the strand with a length A, 0.5