SU1488112A1 - Metal continuous casting method - Google Patents

Abstract

The invention relates to metallurgy, in particular, to the cooling of continuously cast ingots during continuous casting of metal. The goal is to improve the quality of continuously cast ingots by matching the length of the cooling zone to the length of the liquid phase of the ingot. In the process of pouring, the ingot is drawn out of the crystallizer and cooled with an air / air mixture. The flow of water Q in the mixture depends on the working V _slave and the current V speed of the ingot extrusion and the area S of the molded workpiece. Q = Q _slave -KS (V _slave - V), where Q _slave is the water consumption at the working exhaust rate

K - coefficient

allows to reduce thermal stresses in the ingot shell and thereby increase its quality.

Description

 The invention relates to metallurgy, in particular to the cooling of continuous cast ingots in the process of continuous metal casting.

The aim of the invention is to improve the quality of continuously cast ingots by matching the length of the cooling zone to the length of the liquid phase of the ingot.

EXAMPLE 1. In a casting process, with an operating speed of 0.7 m / min, a continuously cast ingot with a cross section of 250 x 1290 mm (section area 0.3225 m2) is cooled in combination: first with a length of 2.4 m with water three collectors with nozzles and then a previously prepared water-air mixture, which is fed into a common distribution manifold with nozzles 10.4 m long on the crystallizer side. Consumption

water in the mixture is 3.7 m / h, air 1200-1400. The length of the liquid phase of the ingot is 16.2 m. The length at which the ingot is cooled is 9.7 m (60% of the length of the liquid phase), including 7.3 m cooled by an air / water mixture.

The ingot pull rate is increased to 0.8 m / min (the length of the liquid phase increases to 18.5 m). The consumption of water in the mixture at the same time

Q 3.7 - 15.5-0.3225- (0.7-0.8)

 4.2 MV4.

With this water flow, the length is oh-; The part of the ingot being coated with an air-water mixture amounts to 8.7 m, and the total cooling length is 11.1 m, which is equal to 60% of the length of the liquid phase.

Example 2. Under the same conditions as in example 1, the speed is out -

(I

WITH

fy

00 00

1HE

The ingot ingot is reduced to 0.6 m / min (the length of the liquid phase is 13.9 m).

In this case, the water consumption in the mixture is reduced to a value of Q 3.7 - 15.5 x X 0.3225 (0.7 - 0.9) 3.2.

Then the length of the chilled water-air mixture of the part of the ingot is 15.9 m, and the total length is 8.3 m, which is equal to the same 60% of the length of the liquid phase as above.

 EXAMPLE 3 Under the conditions of Examples 1-2, the ingot extrusion speed is increased to 1.0 m / min (the length of the liquid phase is 23.1 m).

; The flow of water in the mixture is then increased to the value:

Q 3.7-15.5 ".0.3225 (0.7 - 1.0) 5.2 MV4.

. ,:

 In this case, the length of the part of the ingot cooled with an air-water mixture is 11.5 m, the total cooling length; 13 ,, 9 m, which is 60% of the length of the liquid-: Coy phase.

The consumption of water in the previously obtained water-air mixture, determined depending on the exhaust rate, provides the necessary law of heat removal from the ingot when the extraction rate deviates FROM the operating value by reducing the thermal stress and reducing the ingot rejects on the outside. and. internal cracks.

Claims (1)

Invention Formula The method of continuous casting of metals, including feeding the metal into the mold, drawing an ingot from it with a change in speed and cooling the surface of the ingot with controlling the flow of water and air in the mixture along the length of the ingot, characterized in that, in order to improve the quality of continuous cast ingots; by comparing the length of the cooling zone to the length of the liquid phase of the ingot; water flow rate Q is adjusted in accordance with the dependence Q Qpns - K-S- (Vpc, - V), where Q p in - water consumption at the operating drawing speed, ms / h; V p "ff working speed-pulling, m / min; S is the ingot section area, V is the current draw rate, m / min, K 0.3225 - empirical kb-effect.