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Method for solving transverse cracks of ultra-thick plate billet corner by applying 3D (three-dimensional) spraying process

A technology of extra-thick slabs and transverse cracks, which is applied in the field of secondary cooling system in steelmaking and continuous casting, and can solve problems such as prone to micro-cracks and affecting the yield of steel slabs

Inactive Publication Date: 2012-10-03
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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Problems solved by technology

As the thickness of the slab increases, the bending and straightening force of the slab shell is greater, and micro-cracks are more likely to appear at the corners of the slab, which seriously affects the yield of the slab.

Method used

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  • Method for solving transverse cracks of ultra-thick plate billet corner by applying 3D (three-dimensional) spraying process

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Embodiment Construction

[0010] For extra-thick slabs with a thickness specification of 400mm, the cleaning and inspection results of the slabs were counted and analyzed, and the specific implementation of the 3D spray technology was determined. The steps are as follows:

[0011] 1) The fan-shaped segments for installing 3D nozzles are 1-8 segments;

[0012] 2) The principle of distribution of 3D nozzles in each segment is: according to the distribution of the secondary cooling zone;

[0013] 3) The distribution mode of the 3D nozzles of each segment along the casting direction: parallel and decreasing distribution;

[0014] 4) The distance from the spray edge of each segment 3D nozzle to the corner of the slab 4:

[0015] (1) -0.05m (Secondary Cooling Zone 6, corresponding to 1# segment)

[0016] (2) -0.05m (Secondary Cooling Zone 7, corresponding to 2# segment)

[0017] (3) 0.00m (Secondary cold zone 8, corresponding to 3#, 4# segment)

[0018] (4) 0.10m (Secondary Cooling Zone 9, corresponding ...

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Abstract

The invention discloses a method for solving transverse cracks of an ultra-thick plate billet corner by applying a 3D (Three-dimensional) spraying process, belonging to the technical field of steelmaking continuous casting secondary cooling system. The method comprises the following process steps of: determining fan-shaped sections for installing 3D nozzles; determining a distribution principle of the position of each 3D nozzle at each fan-shaped section; determining the distribution mode of the 3D nozzle at each fan-shaped section along a billet drawing direction; and determining the distance between a spraying edge of the 3D nozzle at each fan-shaped section and a cast billet corner part. The method has the advantages of controlling the incidence rate of the transverse cracks of the ultra-thick plate billet corner effectively, and improving the molding rate of the steel billet.

Description

technical field [0001] The invention belongs to the technical field of secondary cooling systems for steelmaking and continuous casting, and in particular provides a method for solving corner and transverse cracks in extra-thick slabs (thickness specifications ≥ 400mm) by applying a 3D spraying process. Background technique [0002] Many literatures have elaborated on the quality defects of medium-thick slab corner transverse cracks and their solutions. The research shows that by adjusting the cooling method of the secondary cooling nozzle at the corner of the slab, the occurrence of transverse cracks at the corner of the slab can be effectively controlled. incidence. Qinhuangdao Shouqin Metal Material Co., Ltd. (hereinafter referred to as Shouqin Company) 3# casting machine is capable of producing extra-thick slab continuous casting machine with a thickness specification of 400mm or more, straight arc type, and bending-straightening with liquid core. Enterprises rarely use...

Claims

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Application Information

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IPC IPC(8): B22D11/124
Inventor 甄新刚朱志远蒋海涛李景光王玉龙白占禄赵晶孙博王文军刘洋赵新宇
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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