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Method for on-line thermal-state high-speed adjustment of crystallizer width

A crystallizer, high-speed technology, applied in the field of continuous casting, can solve the problems of widening speed limit, hindering productivity, etc.

Active Publication Date: 2017-02-01
CONTINUOUS CASTING TECH ENG OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0016] At present, the traditional on-line thermal width adjustment method commonly used in steel mills is based on the theory of billet shrinkage. Due to the influence of air gap and casting resistance, its width adjustment speed is greatly restricted, which hinders the improvement of productivity.

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  • Method for on-line thermal-state high-speed adjustment of crystallizer width

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Embodiment Construction

[0042] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0043] The setting of the mold width should consider the shrinkage caused by the solidification of molten steel and cooling to room temperature, and the setting of the mold thickness should not only consider the shrinkage but also add a light reduction. According to the composition of steel grades and factors such as continuous casting models, this total shrinkage factor X i It is advisable to take 1.008% ~ 1.025%, and ordinary carbon steel can take 1.013%, so the crystallizer real-time lower mouth width W bi It can be calculated by formula (2):

[0044] W bi =W si ×X i (2)

[0045] Where: W si - width of slab in cold state, mm;

[0046] x i - Slab shrinkage factor, %;

[0047] W bi -Theoretical width of the lower opening of the crystallizer, mm;

[0048] When i=0, it represents the current parameters of the crystallizer;

[0049]...

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Abstract

The invention belongs to the technical field of continuous casting and particularly provides a method for on-line thermal-state high-speed adjustment of the crystallizer width. According to the method for on-line thermal-state high-speed adjustment of the crystallizer width, based on the character that the molten steel solidifies and contracts in a crystallizer, a reasonable crystallizer widening or narrowing mechanism is determined, the adjustment limiting speed of crystallizer widening or narrowing is derived, and the best on-line thermal-state high-speed width adjustment parameter of the crystallizer is selected according to actual production needs. By the adoption of the method for on-line thermal-state high-speed adjustment of the crystallizer width, an air gap between a blank shell and a casting blank in the thermal-state widening or narrowing process is eliminated, and the stress borne by the blank shell is low and uniform; and meanwhile, under the condition of not lowering the drawing rate, the speed of widening or narrowing is improved.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and in particular provides a method for adjusting the width of a crystallizer in an online hot state at high speed. Background technique [0002] The crystallizer is a key part of the slab continuous casting machine, usually composed of two copper plates on the wide side and two copper plates on the narrow side. The molten steel in the tundish is injected into the crystallizer, and the molten steel is initially condensed into the shape of the billet in the crystallizer, forming a shell with a certain thickness, which is continuously pulled out from the lower mouth of the crystallizer, and enters the secondary cooling zone. Create conditions for its complete solidification in the subsequent secondary cooling area. The shell size of the slab is determined by the cavity size of the mold. The cavity size of the crystallizer during casting is adjusted before casting according to the slab ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/05B22D11/16
CPCB22D11/05B22D11/168
Inventor 陈阳裴国良谢长川宁曙光肖海健周干水幸伟皮利华龚伟
Owner CONTINUOUS CASTING TECH ENG OF CHINA
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