SU789213A1 - Ingot continuous casting method - Google Patents

Description

The invention relates to metallurgy and can be used for multi-bulk continuous casting of steel into square ingots. A known method of continuous casting of small square cross-section ingots on multi-riveted units with a pulling drive, including cutting into straight linear molds, drawing ingots from them with a variable speed, cooling the surfaces of the faces of the ingots with water in the secondary cooling zone and then in air, and cutting ingots to measured lengths. In this case, until complete solidification, the ingots are kept in the secondary cooling zone under the ferrostatic pressure of the liquid metal added to the ingot in This is a hardening process to eliminate shrink holes, and the ingot faces are cooled with the same intensity along their perimeter. The closest to the proposed technical essence and the achieved result is a method of continuous casting of ingots of fine square cross section on multi-unit installations with a common draw drive. , including pouring metal into linear crystallizers, drawing ingots from them at a speed of 1.0-2.0 m / min, cooling surfaces of ingot faces with water in the secondary zone cooling with an intensity varying exponentially from the maximum value under the crystallizer to the minimum at the end of the cooling zone, and then in air. In this case, the ingots are cooled along the perimeter with the same intensity 2. The disadvantage of these methods is heating in the zone of secondary cooling of the faces of the ingots facing towards each other. This is due to the fact that the thermal radiation of one face increases the surface temperature of the ingot face spilled on the adjacent stream, which leads to uneven surface temperature around the ingot perimeter, redistribution of thermal stresses in the shell, progressive growth of ingot rhombicity and, as a result their marriage in angular external and internal cracks. In addition, the number of breakthroughs increases.

Claims (1)

The claims in In this case, the faces facing each other are cooled with an intensity of 1.2 times greater than the rest, or 9.6 m '/ m ¹ . h under the mold and 1.9 m * / m ^a- h at the end of the cooling zone. Under these conditions, uniformity of the surface temperature of the ingots along their perimeter is maintained. With an increase in the speed of drawing the ingots to 1.8 m / min, the cooling rate of the faces of the ingots is increased to 10 m ⁵ / m ² -h under the mold and 2.9 m '/ m ² -h at the end of the cooling aeon. Under these conditions, uniformity of the surface temperature of the ingots along their perimeter is maintained. , When reducing the speed of drawing the ingots to 1.2 m / min, the cooling rate of the faces of the ingots is reduced to. 6 m * / m * h under ^a torus and crystallization • 1 tr / m · h ¹ at the end of the cooling zone. In this case, the faces facing one another are cooled with in35 The method of continuous casting of square ingots on multi-strand installations, including pouring metal into crystallizers, drawing out ingots from them at a speed of 1.02.0 m / min. cooling the faces of the ingots with water in the secondary cooling zone with an intensity that exponentially changes from the maximum value under the mold to the minimum at the end of the secondary cooling zone, characterized in that, in order to reduce the rhombicity of the ingot, as well as the number of internal and external cracks by ensuring uniformity surface temperature of the ingots along their perimeter, in the secondary cooling zone, the faces of the ingots facing each other are cooled with water with an intensity of 1.1-1.3 times greater than others.