Surface wrinkle defect of carbon steel in the hot bar rolling process

Kwon, Hyuck-Cheol; Lee, Ho‐Won; Kim, Hak-Young; Im, Yong‐Taek; Park, Hae-Doo; Lee, Duk-Lak

doi:10.1016/j.jmatprotec.2008.10.032

Cited by 29 publications

(11 citation statements)

References 11 publications

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“…Most steel products are manufactured by the hot rolling process because the hot rolling process is one of the most efficient plastic forming processes in metal forming industries. In this process, the initial large and thick material, which is called slab, bloom, and billet, is changed to the desired shape by passing through two counter-rotating rolls in the temperature range of 900-1200 • C. Many researchers have been devoted to measuring and predicting the temperature of steels during the hot rolling process to improve the quality of hot-rolled products because the thermal history of steel has a strong influence on the quality of final products [1][2][3][4][5][6]. Typically, the hot rolling process is categorized into two groups: flat rolling and shape rolling.…”

Section: Introductionmentioning

confidence: 99%

“…Serajzadeh [19] also developed a mathematical 2D model that considered the various process parameters such as caliber shape and rolling speed. Kown et al [1] studied the temperature distribution of the rod during hot rolling using 3D FEM analysis and experimental measurement. They insisted that the temperature in the surface area drastically decreases during rolling and recovers right after rolling due to the heat redistribution within the rod.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, steel wire, rod, and bar manufacturing industries have suffered from the several surface defect problems during hot rolling process: surface flaw, decarburization, and abnormal grain growth [20,21]. On the basis of the author's experiences, these surface defects are strongly related to the uneven temperature distribution of the rod during the shape rolling process in comparison with the plate during the flat rolling process [1,22]. Consequently, it is necessary to investigate the detailed temperature distribution of the rod during the hot rod rolling process.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Behavior of a Rod during Hot Shape Rolling and Its Comparison with a Plate during Flat Rolling

Hwang¹

2020

Processes

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The thermal behavior of a rod during the hot shape rolling process was investigated using the off-line hot rolling simulator and numerical simulation. Additionally, it was compared with a plate during the flat rolling process to understand the thermal behavior of the rod during the hot rolling process in more detail. The temperature of the rod and plate during the hot rolling process was measured at several points with thermocouples using the rolling simulator, and then the measured temperature of each region of a workpiece was analyzed with numerical simulation. During hot rolling process, the temperature distribution of the rod was very different from the plate. The temperature deviation of the rod with area was much higher than that of the plate. The variation in effective stress of the rod along the circumferential direction can induce the temperature difference with area of the rod, whereas the plate had a relatively lower temperature deviation with area due to the uniform effective stress on the surface area. The heat generation by plastic deformation during the forming process also increased the temperature deviation of the rod with area, whereas strain distribution of the plate during flat rolling contributed to the uniformity of temperature of the plate with area. The higher temperature deviation of the rod along the circumferential and radial directions during the shape rolling process can increase the possibility of occurrence in surface defects compared to the plate during flat rolling.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal Behavior of a Rod during Hot Shape Rolling and Its Comparison with a Plate during Flat Rolling

Hwang¹

2020

Processes

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“…In the rolling process, metal strips such as those of titanium, stainless steel, and aluminum alloy often have defects, including edge cracking [1], center bursting [2], surface wrinkling [3], pits, and scratches. To improve the yield and obtain high surface quality, surface defects of raw material strips need to be ground until the original defects are eliminated.…”

Section: Introductionmentioning

confidence: 99%

Study on Grinding and Deformation Fracture Control of Cold Rolled Titanium Strip

Zhang

Dong

et al. 2020

Metals

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Surface defects of titanium strip need to be removed by local grinding, but local cracking or band breaking then occurs during subsequent cold rolling. Tensile properties and deformation resistance of 3 mm thick commercially pure titanium strip with grinding pits on the surface were simulated by a finite-element method using a multi-pass cold-rolling deformation process. The stress and strain of grinding pits with depths of 0.25–2 mm were analyzed. During cold-rolling deformation, the stress and strain in the center of a grinding pit were larger than at the edge region. The strip was first subjected to tensile stress in the rolling direction, which then decreased and gradually changed to compressive stress. Partial stress was larger in the rolling direction than in the transverse direction. When the tensile stress and true strain both exceeded the stress and strain limits during second-pass rolling, the strip with a grinding depth of 2 mm cracked, but shallower grinding pits were repaired. The criterion for cracking during rolling after grinding is that the maximum tensile strain at the bottom of the pit must be less than the critical strain of the material: ln ( 1 + h / H ) ≤ ε C r . Results of numerical simulation were verified by the data for cold-rolling tests.

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“…Thus, one of the most important objectives of a hot rolling plant is minimizing heavy plates with surface defects and discontinuities. There are different types of surface defects [5][6][7][8][9][10][11][12][13][14], with many of them having to do with the poor quality of steel during continuous casting [15][16][17]. Other important stages following continuous casting are reheating and hot rolling.…”

Section: Introductionmentioning

confidence: 99%

Root Cause Analysis of Surface Cracks in Heavy Steel Plates during the Hot Rolling Process

Bahrami

Khouzani

Mokhtari

et al. 2019

Metals

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This paper investigates the root cause of the formation of surface cracks on hot-rolled C–Mn constructional steel heavy plates. Cracks are rather evenly distributed over the surface in the form of colonies of cracks. Samples were cut from the heavy plate. The microstructure of samples in the as-cast and hot-rolled states were studied using optical and electron microscopes as well as energy dispersive X-ray spectroscopy (EDS). Results show that cracks are heavily oxidized. De-carburized areas are also seen alongside cracks. The crack tip is in the form of a deer-horn, indicating that crack branching has taken place during deformation. The crack initiation sites are V-shaped grooves on the surface of as-cast slabs. Correlations between microstructures, processing parameters, and crack formation are discussed.

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Surface wrinkle defect of carbon steel in the hot bar rolling process

Cited by 29 publications

References 11 publications

Thermal Behavior of a Rod during Hot Shape Rolling and Its Comparison with a Plate during Flat Rolling

Thermal Behavior of a Rod during Hot Shape Rolling and Its Comparison with a Plate during Flat Rolling

Study on Grinding and Deformation Fracture Control of Cold Rolled Titanium Strip

Root Cause Analysis of Surface Cracks in Heavy Steel Plates during the Hot Rolling Process

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