Method for judging causes of transverse cracks at corners of slab surface

A judgment method and a technology of transverse cracks, which are applied in the field of iron and steel metallurgy, can solve problems such as difficult to achieve, and achieve the effects of cost saving, simple judgment method and strong operability

Inactive Publication Date: 2020-08-04
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The production of slabs without defects is the expected goal of continuous casting steel plant production, but due to the constraints of production conditions and other factors, it is actually difficult to achieve

Method used

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  • Method for judging causes of transverse cracks at corners of slab surface
  • Method for judging causes of transverse cracks at corners of slab surface
  • Method for judging causes of transverse cracks at corners of slab surface

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The steel type is SS400B, and the corner transverse crack defects on the surface of the slab are taken, and the sample is processed into 20mm×20mm×20mm, and the sample is ground with sandpaper, polishing cloth, etc. to the extent that it can be observed by a metallographic microscope. Corner cracks appear in the vibration mark valleys at the corners. The widest corner cracks are 200 μm and the longest is 5 mm. A total of 4 cracks were observed, as figure 1 and 2 As shown; the microstructure at the corner crack was observed by metallographic corrosion, there was no decarburization layer, no inclusions, the grain size was normal, the same as the grain size at the matrix, and the main components inside the crack were Fe, Na, Si , Mg, Ca, O, for iron oxide and mold flux. During the production of this furnace, the constant casting speed was guaranteed to be 1.3m / min, the liquid level of the crystallizer fluctuated normally, the superheat was 27°C, the billet section was 125...

Embodiment 2

[0027] The steel type is L245M, and the corner transverse crack defects on the surface of the slab are taken, and the sample is processed into 20mm×20mm×20mm, and the sample is ground to the degree that can be observed by a metallographic microscope with sandpaper, polishing cloth, etc. The crack width at the corner is 20-100μm, and the length is less than 2mm. A total of 15 cracks were observed, such as image 3 and 4 As shown; the microstructure at the corner crack was observed by metallographic corrosion, no decarburization layer, no inclusions, normal grain size, the same as the grain size at the matrix, and the main component of the outer and inner cracks are Fe , O, is iron oxide. During the production of this furnace, the constant casting speed was guaranteed to be 1m / min, the crystallizer liquid level fluctuated normally, the degree of superheat was 29°C, the billet cross-section was 1650mm×230mm, which met the requirements of the operating regulations, and the chemic...

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Abstract

The invention discloses a method for judging the causes of transverse cracks at the corners of a slab surface. The method analyzes the causes of cracks at the corners aiming at the cracks at the corners of a slab, mainly uses a metallographic microscope and a scanning electron microscope to inspect the features of the cracks at the corners of the slab, and analyzes the production process of casting billets so as to determine the cause of the corner cracks.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for judging the cause of transverse cracks at the surface corner of a slab. Background technique [0002] Defect-free slab production is the expected goal of continuous casting steel plant production, but limited by production conditions and other factors, it is actually difficult to achieve. Continuous casting slab defects include surface defects, internal quality defects, shape defects, etc. Transverse cracks at the corners of the slab surface are the most common slab defects. The causes of transverse cracks at the corners of the slab surface are extremely complicated. Defects are related to the physical and chemical phenomena that occur during the solidification process of molten steel in the continuous casting machine. Therefore, in actual production, it is necessary to find the cause of the transverse cracks at the corners of the slab surface and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00G01N33/20
CPCB22D11/00G01N33/20
Inventor 韩春鹏张怀军李强段云波李彬钱静秋陈建新靳燕刁望才张胤王爱兰张晓峰
Owner BAOTOU IRON & STEEL GRP
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