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Method for improving continuous casting effect of high-carbon steel

A technology of continuous casting and casting of high-carbon steel, which is applied in the field of metallurgy, can solve the problems of large temperature drop of molten steel, long distance of molten steel flow, stop casting of casting machines, etc., and achieve the goal of reducing temperature drop, eliminating cold steel and improving the effect Effect

Inactive Publication Date: 2017-01-04
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the casting process of high-carbon steel, in order to reduce slab segregation and improve the quality of slab, the superheat of molten steel should be controlled in a low range, so the temperature of ladle molten steel should not be too high; due to the high carbon content of high-carbon steel , the liquidus temperature also decreases accordingly. Therefore, when the continuous casting starts, due to the temperature difference between the temperature of the tundish and the temperature of the molten steel, it is easy to cause cold steel at the bottom of the tundish during the contact process between the molten steel and the tundish. Phenomenon, which in turn leads to difficulties in the continuous casting process, and even causes accidents in which the casting machine stops pouring
[0003] For example, in the 120-ton continuous casting system of HBIS Chenggang, in the process of casting high-carbon steel for wire rods, a billet continuous casting machine with eight machines and eight streams is used. Due to the large number of streams and the long tundish, the molten steel flow distance during the casting process Longer, the temperature drop of molten steel is larger, which aggravates the occurrence of such accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: The specific process of the method for improving the effect of continuous casting of high carbon steel is as follows.

[0018] (1) The liquidus temperature TL during the pouring process in this example is: TL[°C]=1536-78C%-7.6Si%-4.9Mn%-34P%-30S%-3.6Al%-5Cu%-1.3 Cr%-3.1Ni%-2.0Mo%-2.0V%-18Ti%=1536-78*0.81-7.6*0.25-4.9*0.75-34*0.020-30*0.015-1.3*0.20-18*0.016=1465℃ .

[0019] (2) Conventional method of continuous casting: the billet continuous casting machine with eight machines and eight streams is used, and the conventional method is used for casting. The baking temperature of the tundish, the temperature of molten steel and the amount of silicon-calcium powder added at the nozzle before continuous casting are shown in Table 3. .

[0020] Table 3: Conventional continuous casting parameters

[0021] Tundish baking temperature / ℃ Molten steel temperature / ℃ Addition amount of CaSi powder 1135 1561 0

[0022] In the early stage of co...

Embodiment 2

[0034] Embodiment 2: The specific process of the method for improving the effect of continuous casting of high carbon steel is as follows.

[0035] (1) Conventional method of continuous casting: the billet continuous casting machine with eight machines and eight streams is used, and the conventional method is used for casting. Before the continuous casting starts, the baking temperature of the tundish, the temperature of the molten steel and the amount of silicon-calcium powder added at the nozzle are shown in Table 7. .

[0036] Table 7: Conventional continuous casting parameters

[0037] Tundish baking temperature / ℃ Molten steel temperature / ℃ Addition amount of CaSi powder 1130 1558 0

[0038] In the early stage of continuous casting, the temperature of the molten steel in the tundish was measured every 2 minutes, and the temperature change of the molten steel in the tundish is shown in Table 8.

[0039] Table 8: Changes in molten steel temperature ...

Embodiment 3

[0050] Embodiment 3: The specific process of the method for improving the effect of continuous casting of high carbon steel is as follows.

[0051] (1) Conventional method of continuous casting: adopt eight machines and eight streams of billet continuous casting machine, pouring in a conventional method, see Table 11 for the baking temperature of the tundish, the temperature of molten steel and the amount of silicon-calcium powder at the nozzle before continuous casting. .

[0052] Table 11: Conventional continuous casting parameters

[0053] Tundish baking temperature / ℃ Molten steel temperature / ℃ Addition amount of CaSi powder 1133 1559 0

[0054] In the early stage of continuous casting, the temperature of the molten steel in the tundish was measured every 2 minutes, and the temperature change of the molten steel in the tundish is shown in Table 12.

[0055] Table 12: Changes in molten steel temperature for conventional continuous casting

[0056] ...

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Abstract

The invention discloses a method for improving a continuous casting effect of high-carbon steel. Silicon calcium powder is firstly added in a water port at the bottom of a tundish; and tapping molten steel of the high-carbon steel is poured in. The method adopts the method of adding the silicon calcium powder in the tundish before continuous casting of the high-carbon steel, and releases heat through reaction between oxygen in the molten steel and the silicon calcium powder after the molten steel flows into the tundish, so that the temperature drop of the molten steel is reduced, the the steel freezing phenomenon of the molten steel at the bottom of the tundish is eliminated, and the continuous casting effect is effectively improved. Meanwhile, resultants in the continuous casting process facilitate exclusion of inclusions in the molten steel in upward floating process.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a method for improving the casting effect of high-carbon steel continuous casting. Background technique [0002] In the casting process of high-carbon steel, in order to reduce slab segregation and improve the quality of slab, the superheat of molten steel should be controlled in a low range, so the temperature of ladle molten steel should not be too high; due to the high carbon content of high-carbon steel , the liquidus temperature also decreases accordingly. Therefore, when the continuous casting starts, due to the temperature difference between the temperature of the tundish and the temperature of the molten steel, it is easy to cause cold steel at the bottom of the tundish during the contact process between the molten steel and the tundish. Phenomenon, which in turn leads to difficulties in the casting process of continuous casting, and even causes accidents in which the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D1/00
CPCB22D1/00
Inventor 李亚厚胡心光贾元海梁新维盖少群刘雅健
Owner HEBEI IRON AND STEEL