Inspection method for microcracks at corner of carbon steel continuous casting blank

An inspection method and continuous casting slab technology, which is applied in the preparation of test samples, sampling devices, and optical testing for flaws/defects, etc., can solve problems such as scrap products after rolling, achieve the effect of improving the process and eliminating the corner defects of the slab

Inactive Publication Date: 2011-11-02
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of visually inspecting the quality of the corner of the slab without additional investment in the inspection facilities, the present invention provides a method for inspecting micro-cracks at the corner of the carbon steel continuous casting slab. The method of cutting a sample strip of a certain shape from the corner of the slab, and checking it after pickling, timely and accurately feeds back the distribution of small cracks at the corner of the slab, and avoids the circulation of defective slabs to the next process to produce waste products after rolling

Method used

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  • Inspection method for microcracks at corner of carbon steel continuous casting blank
  • Inspection method for microcracks at corner of carbon steel continuous casting blank
  • Inspection method for microcracks at corner of carbon steel continuous casting blank

Examples

Experimental program
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Embodiment

[0027] It is implemented on a billet with a thickness of 230mm and a width of 1700mm, and the steel type is SN400B.

[0028] (1) Sampling

[0029] After the pouring conditions are stable, reserve a sample at the end of the second slab of the third furnace for continuous casting in the tundish, and check the quality of the corner of the slab under the current continuous casting process to determine whether the current continuous casting process meets the steel grade requirements.

[0030] (2) Sample cutting

[0031] After the slab is off-line, the sample is cut off the slab offline, and the sample strips are cut on both sides of the sample. The cutting position of the sample strips is as follows: figure 1 ;

[0032] When cutting the sample strip, it is required that the cutting surface is flat, and the unevenness, inclination, and bow shape of the cutting section should not exceed 10-15mm, and oxygen burning pits should not appear.

[0033] (3) The label of the sample strip,...

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Abstract

The invention provides an inspection method for microcracks at the corner of a carbon steel continuous casting blank. The method comprises the following steps of: (1) sampling; (2) cutting a sample; and (3) pickling the sample. By a method for cutting a sample piece in a certain shape at the corner of a steel casting blank sensitive to cracks and detecting the sample after pickling, the distribution conditions of tiny cracks at the corner of the casting blank can be timely and accurately fed back, so that defects at the corner of the casting blank with crack heat can be eliminated in the ways of flame cleaning or grinding and the like, and the casting blank with corner cracks is prevented from generating rolled wastes after circulating to a rolling process; and the process can be modified in time, and the defects at the corner of the casting blank are reduced and even eliminated.

Description

technical field [0001] The invention relates to a method for inspecting microcracks at corners of carbon steel continuous casting slabs. Background technique [0002] At present, the surface quality of the slab is mainly inspected by visual inspection, which is effective for large surface defects such as horizontal and vertical cracks on the slab. All kinds of small defects on the surface of the slab covered by scale are not conducive to accurately grasping the surface quality of the slab. On the other hand, billet corner cracks, as a common surface defect in major steel mills, are very harmful. Even tiny corner cracks will have a negative impact on the quality of the rear coil. The distribution of small cracks at the corners of the slab cannot be observed by the traditional inspection method for surface defects of the slab, which leads to the circulation of the slab with corner crack defects to the next process, forming waste products after rolling, and is also not conduci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01N1/04G01N1/34
Inventor 张彬王福伟王红慧
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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