Irsid

Arcelormittal Investigacion Y Desarrollo, S.l.

Jean-Marc Jolivet

Martin Beauvais

Laurent Sosin

Manuel Bobadilla

Michel Martinot

Christophe Hemmer

Michel Gaugue

Process for secondary cooling of a metal product continuously cast on a machine in which secondary cooling is divided into n staggered independent zones, within which the flow of cooling fluid varies according to the speed of the product. An undesired change in the surface temperature of the product at a point HD of the metallurgical length of the machine, such as the straightening point, due to a foreseen or foreseeable variation starting at the time t.sub.vo, in the casting speed, is compensated for by anticipation. A determination is made, by means of the casting speed, of the time t.sub.o at which commences, at the upper part of the ingot mold, the portion of product which, at the time tvo, will reach the point HD; a further determination is made of the times t.sub.1, . . . , t.sub.1, . . . , t.sub.n at which the portion commencing at t.sub.o will emerge from the zones 1, . . . . i. . . . ,n of the secondary cooling; and, from the time t.sub.vo, the method of cooling conventionally used is recommenced, varying according to the actual speed.

Process for adjusting the secondary cooling of a machine for continuous

Energetic cooling of the product is performed during continuous casting when, at the core, the product is in a phase of pasty solidification so that the differential thermal contraction between the mushy core and the already completely solidified outer shell produces a squeezing effect of the core by the shell. To this end, means for cooling the product are arranged on the casting machine at the end section of the metallurgical length. The process makes it possible to reduce, and even to avoid, the formation of inner cracks during cooling of the cast product which would lead to the presence of segregated areas in the axial zone. It is applied advantageously to the casting of steels reputed to be difficult to cast continuously, such as steels with a long solidification range whose carbon content is from 0.25 to 1.5%.

Process for cooling a continuously cast metal product

Growing community of inventors

Rurange-les-Thionville, France

Jean-Marc Jolivet