Transformation of the Surface Cracks of in Continuously Cast Slabs Made of Low-Alloy Pipe Steels during Hot Rolling

Chukin, M. V.; Salganik, V. M.; Moller, A. B.; Chikishev, D. N.

doi:10.1134/s0036029521100116

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…The deformation behaviors of surface cracks with different morphologies are also different in the rolling process. [ 19–22 ] Chukin et al systematically studied the deformation of the surface cracks with large size and single morphology in the rolling process by numerical simulation, such as longitudinal, transverse, and corner cracks. [ 19 ] Luo et al investigated the deformation behavior of large transverse surface cracks in the rolling process by physical simulation.…”

Section: Introductionmentioning

confidence: 99%

“…[ 19–22 ] Chukin et al systematically studied the deformation of the surface cracks with large size and single morphology in the rolling process by numerical simulation, such as longitudinal, transverse, and corner cracks. [ 19 ] Luo et al investigated the deformation behavior of large transverse surface cracks in the rolling process by physical simulation. [ 20 ] The article concluded that large transverse surface cracks can be flattened at a large degree of rolling deformation.…”

Section: Introductionmentioning

confidence: 99%

“…The deformation behaviors of surface cracks with different morphologies are also different in the rolling process. [19][20][21][22] Chukin et al systematically studied the deformation of the surface cracks with large size and single morphology in the rolling…”

Section: Introductionmentioning

confidence: 99%

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Formation and Deformation Mechanism of Mountain‐Like Surface Crack on the Hot‐Rolled Thick Plate of HSLA Steel

Shen

Cheng

Wang

2022

steel research int.

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Mountain‐like surface cracks often appear on the thick plates of high‐strength low‐alloy (HSLA) steel after hot rolling, which have a serious impact on production efficiency. Herein, the formation cause of mountain‐like cracks is discussed using methods such as acid pickling and observations of microstructure and inclusions. The deformation behavior of microcracks is obtained by analyzing the rolling process of slab. The inclusions in the top of the crack are Type‐I inclusions with high elemental contents of K and P and Type‐II inclusions with high elemental contents of C. The inclusions in the sides of the crack are Al2O3. It is concluded that mountain‐like cracks are caused by surface microcracks containing Type‐I inclusions in the continuous casting slab. During rolling, the rapid deforming of side‐1 stretches the crack so that the unusual microstructure appears. The cracks extended in the rolling direction have Al2O3 inclusions. The mountain‐like crack with Type‐I inclusions in the top and Al2O3 in the sides eventually form. A single microcrack forms a single mountain‐like crack and multiple clustered microcracks form a continuous mountain‐like crack. To reduce mountain‐like cracks, reducing Type‐I inclusions to reduce surface defects of the slab is an effective means.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Formation and Deformation Mechanism of Mountain‐Like Surface Crack on the Hot‐Rolled Thick Plate of HSLA Steel

Shen

Cheng

Wang

2022

steel research int.

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Formation cause and oxidation behaviour of surface crack on the hot-rolled thick plate of high strength low alloy steel

Shen,

Cheng,

Zhang

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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The formation causes and oxidation behaviour of two types of small-sized and irregular morphological surface cracks on S355 hot-rolled thick plate were investigated. The study employed surface pickling, microstructure analysis and inclusion observation to characterise the cracks. It was observed that the surface morphology of two types of cracks exhibited similarities, while their subsurface morphology differed. The Type-A cracks displayed a bulge shape with a rounded tail, while the Type-B cracks had a V-shaped morphology with a slender tail. The Type-A cracks predominantly consisted of FeO. The surface part of the Type-B cracks contained unusual large-sized carbon particles and Al2O3 inclusions, and the iron oxides within the subsurface part followed the sequence of FeO–Fe2O3–Fe from the centre of the cracks to the steel matrix. It was observed that the Type-A cracks originated from subsurface bubbles in the continuous casting slab, which deformed and developed into surface cracks during the rolling process. The iron oxide inside these cracks was formed through a single oxidation process, and the bulge shape in the subsurface part was a distinguishing characteristic. The Type-B cracks were attributed to surface microcracks on the continuous casting slab, which were linked to the presence of unusual large-sized inclusions. The iron oxides within these cracks underwent two oxidation processes. The subsurface morphology and oxide characteristics are the significant features to identify these small-sized and irregular morphological cracks.

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Transformation of the Surface Cracks of in Continuously Cast Slabs Made of Low-Alloy Pipe Steels during Hot Rolling

Cited by 2 publications

References 6 publications

Formation and Deformation Mechanism of Mountain‐Like Surface Crack on the Hot‐Rolled Thick Plate of HSLA Steel

Formation and Deformation Mechanism of Mountain‐Like Surface Crack on the Hot‐Rolled Thick Plate of HSLA Steel

Formation cause and oxidation behaviour of surface crack on the hot-rolled thick plate of high strength low alloy steel

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