Thick slab corner crack control process

A corner crack and thick slab technology is applied in the field of thick slab corner crack control technology to achieve the effects of reducing stress and strain, reducing corner transverse cracks and optimizing secondary cooling strength

Pending Publication Date: 2021-06-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Production practice shows that the thicker and wider the slab, the easier it is to produce surface cracks and quality defects

Method used

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Examples

Experimental program
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Embodiment Construction

[0041] This embodiment provides a thick slab corner crack control process, aiming at cracks at the thick slab corners of the No. 3 machine of the No. 1 Steelmaking Plant of Nangang. Straight arc continuous casting machine, arc radius is 10.0m, metallurgical length is 32.12m, continuous bending / straightening, the production billet size is (220mm, 260mm, 320mm) × (1600~2800) mm, which is a typical thick plate billet casting machine. By comprehensively optimizing the micro-alloying element composition of steel grades, selecting appropriate alkalinity and viscosity mold slag, adjusting the cooling system of the mold, optimizing the cooling strength of the secondary cooling, optimizing the vibration parameters and taper of the mold, and improving the precision control of casting machine equipment, or taking Measures such as chamfering crystallizer and surface structure control SSC technology can effectively control the occurrence of transverse cracks at the corner of the slab.

[...

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PUM

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Abstract

The invention discloses a thick slab corner crack control process, which relates to the technical field of steel production, and comprises the following steps: comprehensively optimizing steel microalloy element components, selecting casting powder with proper alkalinity and viscosity, adjusting the cooling system of a crystallizer, optimizing secondary cooling strength, optimizing the vibration parameter and taper of the crystallizer, and improving the precision control of casting machine equipment, or measures such as a chamfering crystallizer and a surface structure control SSC technology are adopted, so that the occurrence of transverse cracks at the corners of a casting blank can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a crack control process at the corner of a thick slab. Background technique [0002] Transverse cracks at the corners of continuous casting slabs are usually hidden under the oxidized iron scale or skin of the slabs and cannot be directly observed. Cleaning the corners with a flame and grinding them with a mobile charging grinder can clearly show the transverse cracks. After the thick plate continuous casting slab with the defect of transverse crack is heated and rolled, bubble-shaped cracks will appear 20-50mm away from the edge of the upper and lower surfaces of the steel plate. Inhomogeneous temperature field, structural phase transition during solidification and poor equipment precision will cause additional stress and strain at the corners of the slab. At the same time, improper continuous casting process and casting operation make the solidification proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00B22D11/055B22D11/128B22D11/22B22D11/057
CPCB22D11/001B22D11/055B22D11/128B22D11/225B22D11/057
Inventor 王攀峰常运合吴伟勤陈从俊张禹群冯巍邓俊棕
Owner NANJING IRON & STEEL CO LTD
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