A method for controlling cracks in the web center of profiled billets

A control method and center crack technology, which is applied in the field of web center crack control of special-shaped slabs, can solve problems such as web center cracks, complex casting sections, and special forms of casting slab support systems in the secondary cooling zone of the mold, so as to enhance competitiveness , Improve the internal quality and rolling yield, and eliminate the effect of the occurrence rate of crack defects in the center of the web

Active Publication Date: 2019-03-29
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for controlling cracks in the center of the web of a special-shaped billet, which solves the problem of cracks in the center of the web of the special-shaped billet caused by the complex casting section, the shape of the crystallizer and the special form of the billet support system in the secondary cooling zone

Method used

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  • A method for controlling cracks in the web center of profiled billets
  • A method for controlling cracks in the web center of profiled billets
  • A method for controlling cracks in the web center of profiled billets

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Embodiment 1

[0036] Utilize the determination method of the wingtip taper of the special-shaped mold crystallizer that the method involved in the present invention formulates to obtain application on the spot,

[0037] A method for controlling cracks in the web center of a special-shaped billet, the specific steps and parameters are as follows:

[0038] 1. Obtain the distance between the outlet of the billet support system of the special-shaped billet continuous caster and the mold meniscus:

[0039] The section size of the profile billet continuous casting machine is 295mm×205mm×85mm; the arc radius of the caster foundation is 10m; The first cooling zone and the second cooling zone The second cooling zone is composed of three cooling circuits, the inner arc, the outer arc and the side of the slab, and there are 7 cooling circuits in total. The distance between the exit of the slab supporting system and the meniscus of the mold is 4.9m, including the length of the foot roll area of ​​0.77...

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Abstract

The invention provides a control method for a web center crack of a special-shaped blank and belongs to the technical field of steel making near-net-shape continuous casting. The control method for the web center crack of the special-shaped blank comprises the steps that the distance between an outlet of a casting blank supporting system a special-shaped blank continuous casting machine and a crystallizer meniscus is obtained to be 4-6 m; through pretreatment, model building, calculation process and post-treatment, the real-time thermal state information existing when the casting blank is located at different positions in the continuous casting machine is analyzed; the web centre liquid core length Lfb is controlled, and m is within the range of Dsg-1.0<=Lfb<=Dsg; the components of the steel type are optimized and adjusted, and according to the shrinkage amounts of the thicknesses, at a flange and a web, of the casting blank, the roll gap shrinkage taper of each sector section in the casting blank supporting system is set. The control method for the web center crack of the special-shaped blank has the advantages that the method is simple, economical and efficient, the occurrence rate of the web center crack defect is effectively reduced or the web center rack defect is effectively eliminated, and the competitiveness of the product is improved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking near-net shape continuous casting, and in particular relates to a method for controlling cracks in the web center of a special-shaped billet. Background technique [0002] The use of special-shaped billets instead of square billets to produce section steel can significantly reduce the rolling workload of the blanking machine, and save rolling, heating energy consumption and labor costs. The continuous casting of shaped billets is relatively rapid at home and abroad, and the cross-section covers a wide range of 295-1118mm×150-500mm×50-140mm. [0003] Due to the complex casting section of the special-shaped billet, the shape of the mold and the special form of the billet support system in the secondary cooling zone, the special-shaped billet is prone to defects such as webs, flange longitudinal cracks, and web center cracks. [0004] The crack in the center of the web is one of the main defects...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/22
CPCB22D11/009B22D11/22B22D11/225
Inventor 刘珂孙齐松陈涛邸全康王勇丁宁孔祥涛吕迺冰佟倩徐士新
Owner SHOUGANG CORPORATION
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