Evolution of Surface Transversal Crack in Intermediate Slabs during Hot Rolling Deformation

Luo, Yanzhao; Zhang, Jiongming; Liu, Qiang; Li, Mao-kang; Han, Yi-tong; Cao, Yang

doi:10.1016/s1006-706x(14)60074-1

Cited by 6 publications

(6 citation statements)

References 16 publications

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“…Incorrect internal diameter results from exceeding the permissible deviation between the inside diameter of the pipe, measured at the ends or determined on the basis of measurements of the outside diameter and wall thickness, anywhere on the length and circumference of the pipe, and the nominal internal diameter. The reason for the incorrect internal diameter may be the failure to maintain the rolling parameters, the worn roller rod, the poor calibration causing too large a reduction in the outside diameter or the curvature of the pipe (Luo et al, 2014, Nioi et al, 2019. Removal of the defect is possible by grinding the internal surface with a pneumatic or a cutting machine, sometimes straightening.…”

Section: Defects and Incompatibilities Created During The Rolling Promentioning

confidence: 99%

Defects and Incompatibilities of Pipes Manufactured by Pilgrim Method

Biś

Koczurkiewicz

Mazur

2019

New Trends in Production Engineering

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The increase in the quality requirements for the pipes and the increasing needs to reduce production costs, while increasing the efficiency of the process in market of hot rolled pipes are observed. One of the cost reduction factors is the reduction of the number of defects by early detection and, if possible, the removal of non-conformities. Incompatibility is an error that can be removed in accordance with the performance standard that does not cause defects (Norma API). The defect is imperfection that is so important that it is the basis for the removal of the product or its part based on the criteria set out in the performance standards. In pipe manufacturing processes, defects and batch incompatibilities can be distinguished, which arise in the steelworks during metal solidification and roll forming in the course of metal processing. The defect may also arise as a result of removing steel material or result from rolling processes defects. The paper presents the analysis of the process of quality control of pipes manufactured using the pilgrim method on the basis of real process data. The analysis were involved 1070 pieces of ingots from 11 different melts for rolling pipes. At various stages of production, discrepancies and defects were revealed, which were caused by metallurgical or technological defects associated with rolling pipes. The total amount of discrepancies and defects eliminated 168 pieces of finished pipes. The aim of the work is to show that by means of appropriately selected methods of eliminating imperfections, it is possible to increase the efficiency of the manufacturing process.

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Section: Defects and Incompatibilities Created During The Rolling Promentioning

confidence: 99%

Defects and Incompatibilities of Pipes Manufactured by Pilgrim Method

Biś

Koczurkiewicz

Mazur

2019

New Trends in Production Engineering

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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 ] 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. However, this article studied the prefabricated surface cracks with simple morphology and large size so the conclusion was not applicable to surface cracks with small size and complex morphology.…”

Section: Introductionmentioning

confidence: 99%

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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“…Evolution of surface defects during hot rolling process can be investigated by experimental method (Luo et al , 2014; Gao et al , 2014). However, physical simulation is difficult to do quantitative analysis, get mathematical rules and make any artificial defect of any rolling pass in whole cross-section of rolled material.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on flow behavior of surface defects in the heavy rail rolling

Pan

Ding

Chang

et al. 2018

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Purpose Surface defects are often present on the surface of continuous casting slabs and rolled products. A lot of surface defects of hot rolled products are inherited from initial defects on continuous casting slabs. This work aims to trace the original surface defect during the whole heavy rail rolling and avoid black line surface defect that appears on the surface of heavy rail finial product. Design/methodology/approach Artificial round hole-shaped surface defects on the surface of continuous casting slab during the hot rolling of 60 kg/m heavy rail are analyzed experimentally and by means of explicit dynamic finite element method (FEM) and modified model rebuilding method. Findings The calculated results of surface defect locations of heavy rail finial product are in good agreement with the experimental ones. It is shown that the explicit dynamic FEM and modified model rebuilding method can be used effectively to predict the flow behavior of surface defects in the hot rolling of 60 kg/m heavy rail. Originality/value The three-dimensional finite element model for whole heavy rail rolling is built using explicit dynamic code and modified model rebuilding method. Flow behavior of black lines is studied in the 60-kg/m heavy rail rolling. The simulation results of six typical points are in good agreement with the experimental results.

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Evolution of Surface Transversal Crack in Intermediate Slabs during Hot Rolling Deformation

Cited by 6 publications

References 16 publications

Defects and Incompatibilities of Pipes Manufactured by Pilgrim Method

Defects and Incompatibilities of Pipes Manufactured by Pilgrim Method

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

Experimental and numerical studies on flow behavior of surface defects in the heavy rail rolling

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