Method for preventing peritectic steel continuous casting blank from generating cracks

A technology for continuous casting slabs and cracks, which is applied in the field of preventing cracks in peritectic steel continuous casting slabs. It can solve the problems of deteriorating casting slab lubrication, reducing casting speed, and difficult gaps, so as to improve the quality of casting slabs and increase production efficiency. , the effect of reducing the amount of cleaning
CN101992283AInactive Publication Date: 2011-03-30ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ANGANG STEEL CO LTD
Publication Date
2011-03-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for preventing a peritectic steel continuous casting blank from generating cracks, which comprises a step of continuously casting by using a continuous casting machine. The method is characterized in that: in the continuous casting process, protective slag of which the alkalinity is 1.3 to 1.5 and the viscosity is 0.03 to 0.07Pa.s at 1,300 DEG C; a crystallizer adopts sinusoidal vibration, and has the vibration frequency of 150 to 198min<-1> and the vibration amplitude of 5.0 to 8.0mm; and the water volume of the crystallizer is reduced by 5 to 10 percent. The method effectively solves the problem of cracks on the surface of the peritectic steel continuous casting blank, improves the quality of the casting blank, and reduces casting blank clearing quantity and waste quantity.
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Description

technical field

[0001] The invention belongs to the method for improving the quality of cast slabs in the technical field of continuous casting, and in particular relates to a method for preventing cracks in peritectic steel continuous casting slabs. Background technique

[0002] Steel with carbon content of 0.08% to 0.17% is called peritectic steel, which is very prone to cracks during continuous casting. The main reasons for crack sensitivity of peritectic steel are:

[0003] When the peritectic steel is solidified, it is in the peritectic region (L+δ→γ), and the δ Fe → γ Fe phase transition, resulting in a larger volume shrinkage (0.38%). The solidified billet shell separates from the mold copper plate to form an air gap, which reduces the heat transfer rate from the billet shell to the mold, and the billet shell will become thinner and form a depression on the surface. Due to the uneven thickness of the billet shell, under the action of thermal stress, friction force...

Claims

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