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Control method for center segregation of casting blank

A control method and a casting billet technology, applied in the field of iron and steel metallurgy, can solve the problem of low homogeneity of steel products, and achieve the effects of improving the central segregation problem, reducing the casting temperature and improving the homogeneity.

Active Publication Date: 2020-10-30
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the problem of low homogeneity of steel products in the prior art, and provide a method for controlling slab center segregation, which effectively reduces the temperature of molten steel in the continuous casting process , so as to improve the center segregation problem and improve the homogeneity of the slab

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment is that a steelmaking plant adopts the method invented by the present technology to produce 160mm×160mm section SWRH82B hard wire products.

[0041] The specific execution process is: casting speed Vc=1.8m / min; casting cross-sectional area S=0.16*0.16=0.0256m 2 ; The enthalpy value H of the original temperature of the molten steel in the tundish Tc =1261.2kJ / kg; enthalpy value H of the target temperature of molten steel in the tundish Tm =1258.0kJ / kg; alloy steel wire radius r=0.005m; enthalpy value H of alloy steel wire when the molten steel in the tundish is at the target temperature Tsm =H Tm =1258.0(kJ / kg), the enthalpy value H at the initial temperature of the alloy steel wire Tsc = 50 kJ / kg.

[0042] Substituting into the calculation formula of wire feeding speed, the calculated wire feeding speed Vs is 1.50m / min. At the same time, the casting temperature at the position of the strand in the continuous casting production can be reduced from 1479...

Embodiment 2

[0046] This embodiment is that a steelmaking plant adopts the method invented by the present technology to produce 160mm×160mm section SWRH82B hard wire products.

[0047] The specific execution process is: casting speed Vc=1.7-1.8m / min; casting cross-sectional area S=0.16*0.16=0.0256m 2 ; The enthalpy value H of the original temperature of the molten steel in the tundish Tc =1270.1kJ / kg; enthalpy value H of the target temperature of molten steel in the tundish Tm =1261.2kJ / kg; alloy steel wire radius r=0.005m; enthalpy value H of steel wire when the molten steel in the tundish is at the target temperature Tsm =H Tm =1261.2 (kJ / kg), the enthalpy value H at the initial temperature of the alloy steel wire Tsc = 50 kJ / kg.

[0048] Substituting into the calculation formula of wire feeding speed, the calculated wire feeding speed Vs is 3.93-4.16m / min. The casting temperature at the position of the strand can be reduced from 1498°C to 1479°C, and the liquidus temperature is 147...

Embodiment 3

[0052] This embodiment is that a steelmaking plant adopts the method invented by the present technology to produce 160mm×160mm section SWRH82B hard wire products.

[0053] The specific execution process is: casting speed Vc=1.8-1.9m / min; casting cross-sectional area S=0.16*0.16=0.0256m 2 ; The enthalpy value H of the original temperature of the molten steel in the tundish Tc =1270.1kJ / kg; enthalpy value H of the target temperature of molten steel in the tundish Tm =1261.2kJ / kg; alloy steel wire radius r=0.005m; enthalpy value H of alloy steel wire when the molten steel in the tundish is at the target temperature Tsm =H Tm =1263.2(kJ / kg), the enthalpy value H at the initial temperature of the alloy steel wire Ts c = 50 kJ / kg.

[0054] Substituting into the calculation formula of wire feeding speed, the calculated wire feeding speed Vs is 4.16-4.39m / min. The casting temperature at the position of the strand can be reduced from 1498°C to 1481°C, and the liquidus temperature ...

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Abstract

The invention relates to the field of steel and iron metallurgy, particularly to a control method for center segregation of a casting blank. The method specifically comprises the following steps: (1)manufacturing an alloy steel wire having the same type as a target casting steel type; (2) calculating a thermal enthalpy value of medium steel ladle liquid according to an actual temperature of the medium steel ladle liquid; (3) calculating the heat consumed to reach thermal balance according to a target temperature of the medium steel ladle liquid; and (4) feeding the alloy steel wire in step (1) in the medium steel ladle liquid to supply the heat. The control method improves the problem of center segregation by effectively lowering the casting temperature of the medium steel ladle liquid inthe continuous casting production process, so that the homogeneity of the casting blank is improved.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for controlling segregation at the center of a slab. Background technique [0002] With the rapid development of society, iron and steel materials are the most widely used metal materials, and their quality performance requirements are getting higher and higher, which puts forward higher requirements for the quality of steel product blanks, including the chemical composition uniformity, purity and Density, in which the control of chemical composition uniformity is also called segregation control. Segregation control has always been the focus and difficulty of steelmaking research. The uniformity of chemical composition directly affects the control of product structure and performance. For example, as an important power transmission component, gear steel is required to have high crush resistance, pitting corrosion resistance, good impact resistance, bending resist...

Claims

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Application Information

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IPC IPC(8): B22D11/18B22D1/00C21C7/00
CPCB22D1/00B22D11/18C21C7/0006
Inventor 李红光陈天明陈亮郭奠荣
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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