Method for preventing longitudinal cracks on surface of sub-peritectic steel casting blank

A longitudinal crack and peritectic technology, applied in the field of continuous casting, can solve problems such as prone to longitudinal cracks, achieve the effects of reducing negative slip time, improving lubrication, and preventing longitudinal cracks

Inactive Publication Date: 2019-02-19
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention solves the technical problem that longitudinal cracks easily appear on the surface of the hypop

Method used

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  • Method for preventing longitudinal cracks on surface of sub-peritectic steel casting blank
  • Method for preventing longitudinal cracks on surface of sub-peritectic steel casting blank
  • Method for preventing longitudinal cracks on surface of sub-peritectic steel casting blank

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, the carbon content of the molten steel is C=0.101%, and the composition and physical properties of the mold flux used are shown in Table 1.

[0038]

[0039] Table 1

[0040] Among them, the billet casting speed is 1.3m / min; the billet specification is 230*1550mm; The flow velocity is 11m / s; the crystallizer inlet water temperature is 30.9°C. The crystallizer adopts non-sinusoidal vibration: the amplitude is 7.2mm, and the vibration frequency is 146min -1 , Negative slip time 0.105s.

[0041] No obvious longitudinal cracks were found on the surface of the slab produced by the continuous casting method of Example 1.

Embodiment 2

[0043] In this embodiment, the carbon content of the molten steel is C=0.127%, and the composition and physical properties of the mold flux used are shown in Table 2.

[0044]

[0045] Table 2

[0046] Among them, the billet casting speed is 1.2m / min, and the billet size is 230*1650mm; the water flow density at the wide side of the mold is 4400L / min, and the water flow rate is 8.2m / s; the water flow density at the narrow side of the mold is 460L / min, The water flow rate is 10.1m / s; the crystallizer inlet water temperature is 31.8°C. The crystallizer adopts non-sinusoidal vibration: the amplitude is 6.8mm, and the vibration frequency is 147min -1 , Negative slip time 0.105s.

[0047] No obvious longitudinal cracks were found on the surface of the slab produced by the continuous casting method of Example 2.

Embodiment 3

[0049] In this embodiment, the carbon content of the molten steel is C=0.089%, and the composition and physical properties of the mold flux used are shown in Table 3.

[0050]

[0051] table 3

[0052] Among them, the billet casting speed is 0.9m / min, and the billet specification is 230*1950mm; the water flow density of the wide side of the mold is 4400L / min, and the water flow rate is 8.2m / s; the water flow density of the narrow side of the mold is 460L / min, The water flow rate is 10.1m / s; the crystallizer inlet water temperature is 30.7°C. The crystallizer adopts non-sinusoidal vibration: the amplitude is 5.9mm, and the vibration frequency is 152min -1, the negative slip time is 0.104s.

[0053] No obvious longitudinal cracks were found on the surface of the slab produced by the continuous casting method of Example 3.

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Abstract

The invention relates to the technical field of continuous casting, in particular to a method for preventing longitudinal cracks on the surface of a sub-peritectic steel casting blank. The method comprises the following steps of: in a continuous casting process, adopting casting powder, the viscosity of which is 0.08-0.14 Pa.s when the alkalinity of the casting powder is 1.2-1.4 and the temperature of the casting powder is 1300 DEG C; reducing the water quantity of a crystallizer by 5%-10%; and controlling the water inlet temperature of the crystallizer to be 28-35 DEG C, wherein the crystallizer is in non-sinusoidal vibration. According to the method for preventing the longitudinal cracks on the surface of the sub-peritectic steel casting blank provided by the embodiment of the invention,the cracks are prevented from occurring on the surface of the sub-peritectic steel casting blank by adopting the casting powder, the viscosity of which is 0.08-0.14 Pa.s when the alkalinity of the casting powder is 1.2-1.4 and the temperature of the casting powder is 1300 DEG C, reducing the water quantity of the crystallizer by 5%-10% and controlling the water inlet temperature of the crystallizer to be 28-35 DEG C. As the lubrication effect of the casting powder is reduced after the alkalinity of the casting powder is increased, the non-sinusoidal vibration and the high-vibration frequencyand small amplitude vibration mode are adopted to reduce the negative slip time and improve the lubrication, and the longitudinal cracks on the surface of the sub-peritectic steel casting blank can beeffectively prevented.

Description

technical field [0001] The invention relates to the technical field of continuous casting, in particular to a method for preventing longitudinal cracks on the surface of a hypoperitectic steel slab. Background technique [0002] Steel with carbon content of 0.08% to 0.16% is called sub-peritectic steel, which is very prone to cracks during continuous casting. The main reasons for the cracks in the hypoperitectic steel are: when the hypoperitectic steel solidifies, it is in the peritectic region (L+δ→γ) and occurs δ Fe → γ Fe The phase change produces a large volume shrinkage, which separates the solidified shell from the copper plate of the crystallizer to form an air gap, reduces the heat transfer rate from the shell to the mold, thins the shell, and forms a depression on the surface. Due to the uneven thickness of the billet shell, under the action of thermal stress, friction force, hydrostatic pressure, etc., the stress concentration at the weakest part of the solidifie...

Claims

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Application Information

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IPC IPC(8): B22D11/108B22D11/111B22D11/053B22D11/07B22D11/22
CPCB22D11/053B22D11/07B22D11/108B22D11/111B22D11/22
Inventor 倪有金张颖华亢小敏朱建强俞学成马威胡卫东
Owner BEIJING SHOUGANG CO LTD
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