METHOD FOR CONTINUOUS CASTING OF RECTANGULAR CROSS SECTION INGOTS Russian patent published in 2004 - IPC

FIELD: metallurgy, namely ingot continuous casting processes and equipment. SUBSTANCE: method for continuously casting ingots in curvilinear type casting plants comprises steps of feeding steel into mold, drawing ingot out of mold at variable speed; cooling ingot by means of water-air mixture sprayed through nozzles at changing specific water flowrate in desired zones and according to large and small radiuses of plant; determining total water consumption for cooling mold according to expression F = exp-0.29 x M - 0.095 x[C] + 1.41 x B - 0.103 x L + 0.473 x H - 5.71 where F - water consumption for cooling mold, cub.m/h; M - moisture content of slag forming mixture, %; [C] - carbon content in slag forming mixture,%; B - alkalinity degree of slag forming mixture; L - width of billet, m; H - depth of lattice type cracking on billet surface, m. Total specific water flowrate for cooling ingot in secondary cooling zones at side of large and small radiuses is determined respectively according to given expressions. For each secondary cooling zone absolute water consumption Fi = Ki x F, where F - total absolute water consumption cub.m/(h x cub.m); Ki -empiric function received experimentally and depending upon percentage content of chemical elements in steel. Method provides lowering of lattice type cracking by 8 -10%, seat-like cracking and cracking normal to wide face of ingot by 15 -20%. EFFECT: possibility for achieving desired temperature of ingot surface at outlet of mold and at outlet of last secondary cooling zone, uniform cooling of ingot. 3 tbl, 1 ex