Controlling method of center segregation of continuous casting

A control method and continuous casting slab technology, which is applied in the field of steelmaking and continuous casting, can solve problems such as poor control of continuous casting slab center segregation, and achieve the effects of improving product performance, improving segregation control level, and improving homogenization performance
CN108856668AActive Publication Date: 2018-11-23SHOUGANG CORPORATION +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHOUGANG CORPORATION
Publication Date
2018-11-23

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Abstract

The invention belongs to the technical field of steel-making continuous casting, and discloses a controlling method of center segregation of a continuous casting. The method comprises the steps of high superheat controlling: the superheat of molten steel in a pouring box is controlled at 30 DEG C or above; strong secondary cooling controlling: in secondary cooling, secondary cold water amount is increased by 20-50%; downward screwing controlling: at the solidifying final stage of the production process of the continuous casting, the downward screwing depth is controlled at 4.2-7.2 mm; the components of the molten liquid is controlled at, by mass, 0.09-0.12% C, 1.85-2.20% Mn and 0.1-0.2% Ti. The controlling method of the center segregation of the continuous casting is used for high-strengthsteel and pipe line steel, through specific component element controlling and superheat, downward screwing amount and secondary cooling strength controlling, the segregation is compressed at a central line region, and component homogenizing performance is improved.
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Description

technical field

[0001] The invention relates to the technical field of steelmaking and continuous casting, in particular to a control method for central segregation of continuous casting slabs. Background technique

[0002] With the expansion of the market and the development of varieties, the requirements for the internal quality control of continuous casting slabs are becoming increasingly strict, especially new requirements are put forward for the homogenization level of components of continuous casting slabs. Therefore, the central segregation of the continuous casting slab must be strictly controlled during the trial production of new varieties and the production of high-grade varieties of steel.

[0003] The macroscopic flow of molten steel causes high solute molten steel to gather in the center of the slab, which worsens the center segregation. The research shows that the solidification structure of the slab has an important influence on the central segregation. The...

Claims

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