Descalability on Reheated Steel Slabs at High Temperature

Nakamura, Takayuki; Sato, M.

doi:10.2355/tetsutohagane1955.80.3_237

Cited by 7 publications

(5 citation statements)

References 2 publications

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“…Some relatively big gaps are formed from through -thickness cracks developed at the entry zone due to longitudinal tensile strain in that area. This phenomenon, as has been shown numerically, was also discussed by other authors, observing experimentally similar cessation of crack propagation within the scale [8] . The small gaps can become even narrower during passage through the roll gap.…”

supporting

confidence: 86%

“…To prevent these defects, several approaches have been proposed, such as control of slab temperature and strengthening of water jet descaling [35,37,38] . In other work, the mechanism of scale removal and the scale properties at high temperatures were analyzed while varying different operational factors in a plate rolling mill [8] . It has been shown that the main parameters of hydraulic descaling are the time for through -thickness cooling of the scale and the heat transfer coeffi cient between scale and stock [39] .…”

Section: Surface Finish In the Hot Rolling Of Low -Carbon Steelmentioning

confidence: 99%

“…In the case when the roll scale cannot be neglected in terms of the heat transfer, Equation 8.6 can be rewritten as In the case when the roll scale cannot be neglected in terms of the heat transfer, Equation 8.6 can be rewritten as…”

Section: Evaluation Of Interfacial Heat Transfer During Hot Steel Rolmentioning

confidence: 99%

See 2 more Smart Citations

Understanding and Predicting Microevents Related to Scale Behavior and Formation of Subsurface Layers

Krzyżanowski

Beynon

Farrugia

2010

Oxide Scale Behavior in High Temperature Metal Processing

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Research the behavior of oxide scale on a metal surface during different kinds of deformation at elevated temperatures has mostly been motivated by a desire to better understand the microscopic events at the tool/workpiece interface that could infl uence heat transfer, friction, descalability, and surface fi nish during hot rolling operations. Direct observations of oxide scale behavior under industrial hot working conditions is very diffi cult, while it is not much easier in the laboratory. Any single experiment is not capable of representing the full range of phenomena taking place during this high -temperature processing. Hence, a range of techniques have been developed, each providing a partial insight. The experimental results have been interpreted numerically; then a physically based numerical model of the rolling operation has been developed and used to simulate the process. Detailed fi nite element analysis allowed for the consideration of scale evolution and also for detailed understanding of the microevents both during testing and technological operations. Some results obtained by this complex investigation are presented in this chapter. After relevant adjustment of the mathematical model, it gives a basis for better prediction of the technological operation providing corresponding design criteria. 8.

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supporting

confidence: 86%

Section: Surface Finish In the Hot Rolling Of Low -Carbon Steelmentioning

confidence: 99%

See 1 more Smart Citation

Understanding and Predicting Microevents Related to Scale Behavior and Formation of Subsurface Layers

Krzyżanowski

Beynon

Farrugia

2010

Oxide Scale Behavior in High Temperature Metal Processing

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“…To prevent these defects, hydraulic descaling is necessary to remove oxide scales formed during reheating and ensure the required quality of the final product. There has been considerable work relating hydraulic descaling to oxide scale thickness, 2) descaling system, [2][3][4][5] steel temperature, 2,6) steel composition, [5][6][7] and scale morphology. 7) However, there is relatively little information available on how the heating atmosphere influences hydraulic descaling.…”

Section: Introductionmentioning

confidence: 99%

“…There has been considerable work relating hydraulic descaling to oxide scale thickness, 2) descaling system, [2][3][4][5] steel temperature, 2,6) steel composition, [5][6][7] and scale morphology. 7) However, there is relatively little information available on how the heating atmosphere influences hydraulic descaling. Industrial reheating operations are usually carried out in atmospheres of relatively low oxidizing potential, composed mainly of some free oxygen, carbon dioxide, water vapour, and nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Effect of O2 in Heating Atmosphere on Hydraulic Descaling in Hot Rolling of Low Carbon Steel

Basabe

Szpunar

2008

ISIJ Int.

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Low carbon steel was oxidized over the temperature range 1 050-1 250°C in O 2 -CO 2 -H 2 O-N 2 gas mixtures. The oxidation times were 15-120 min, and the scales were 130-2 000 mm thick. The experimental parameters were chosen to approximate scale formation under conditions similar to those of reheating furnaces in hot strip mills. In the hydraulic descaling tests, two modes of scale removal were observed. In the first mode, observed in classical three-layer scales that developed an inner porous layer with low or medium porosity, the horizontal undercutting occurred at the boundary of the inner porous layer and dense scale. The second mode was observed in classical three-layer scales that developed an inner porous layer with high porosity, and in crystalline scales. In the second mode, the horizontal undercutting occurred at the first plane of large pores relative to the scale/steel interface. A rise in the concentration of free oxygen resulted in an increase in thickness of the residual scale at 1 050°C. At 1 100°C and 1 150°C, the increase in residual scale thickness with increasing free oxygen was significant in the initial 60 min of oxidation; after this period of time the differences in the thickness of the residual scale became smaller. At higher temperatures, the influence of free oxygen in the residual scale thickness was small at 1 200°C and negligible at 1 250°C. In general, the experiments showed that scale morphology controlled the removability of scale.

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Oxide Behaviour in Hot Rolling

Krzyżanowski

Beynon

2002

Metal Forming Science and Practice

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Descalability on Reheated Steel Slabs at High Temperature

Cited by 7 publications

References 2 publications

Understanding and Predicting Microevents Related to Scale Behavior and Formation of Subsurface Layers

Understanding and Predicting Microevents Related to Scale Behavior and Formation of Subsurface Layers

Effect of O2 in Heating Atmosphere on Hydraulic Descaling in Hot Rolling of Low Carbon Steel

Oxide Behaviour in Hot Rolling

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