Modelling heat transfer in hot rolling work rolls

Guerrero, Martha; Flores, Carlos Roberto Renderos; Pérez, A.; Colás, Rafael

doi:10.1016/s0924-0136(99)00083-7

Cited by 38 publications

(20 citation statements)

References 6 publications

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“…The reduction in the oxidation rate of the steel in the water containing condition at 615°C can be related to: (1) the increment in thickness of the oxide scale and, (2) to the development of a thick compact structure of hematite located at the top of the scale where the mobility of ionic species was probably restricted. This fact agrees with the observations made by Jansson and Vannerberg [9] where a reduction in the oxidation rate of iron was attributed to the formation of hematite whiskers at a similar temperature interval.…”

Section: Discussionmentioning

confidence: 99%

“…In the finishing stands of hot steel strip mills, the work rolls used to deform high temperature steel strips are heated up by the contact with the strip and the surface temperature can reach values in the interval comprised between 500 and 650°C, this depending on the temperature of the strip [1,2]. The high temperature at the surface of the work rolls generates thermal stresses that promote surface degradation by thermal fatigue [3,4].…”

Section: Introductionmentioning

confidence: 99%

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High Temperature Oxidation of a Work Roll Grade High Speed Steel

2011

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High speed steels are used for the manufacture of the work rolls used in hot rolling steel mills. An understanding of the degradation phenomena of work rolls is essential, particularly in fields related to the oxidation of the surface, given the importance of the surface quality of the rolled product at the end of the process and its close relation with the changes experienced by the surface of the rolls. The high temperature oxidation behaviour of a work roll grade high speed steel was studied using gravimetric means under isothermal conditions at 550 and 615°C in dry air and in a mixture of dry air and water vapour. At both temperatures, the mass gain of the samples exposed to the mixture of dry air and water vapour was considerably higher than that of the samples exposed to dry air. For all the experimental conditions, oxide growth was better described by the parabolic rate law. The composition of the oxide layer was influenced by the oxidant atmosphere, as the layer in the water vapour containing environment included an iron-chromium spinel (M 3 O 4 ), magnetite and hematite, whereas the layer in the dry air condition consisted of iron-chromium spinel, hematite and vanadium oxide. The effect of composition of the oxidant atmosphere on the rate of oxidation of the steel and the components of the oxide scale is discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation of a Work Roll Grade High Speed Steel

2011

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“…These rolls are subjected to cyclic conditions created by contact to the hotter steel strip, and the impingement of water jets used to maintain their temperature within a narrow working range [1]. The thermal gradients within the work rolls can be computed when the adequate boundary conditions are applied to their surface, as has been done in previous works [2].…”

Section: Introductionmentioning

confidence: 99%

“…The work rolls are heated during contact with the strip, either by conduction, which is predominant in hot rolling [2,3], or by friction, which is the leading one in cold rolling [4], if the energy influx surpasses certain limits, the profile of the work rolls will be affected by thermal expansion [5] or by wear [3,6].…”

Section: Introductionmentioning

confidence: 99%

Modeling the thermal and thermoelastic responses of work rolls used for hot rolling steel strip

Corral¹,

Colás

Pérez

2004

Journal of Materials Processing Technology

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“…The isothermal oxidation behaviour of work rolls made of high chromium irons and high speed steels has been studied [6,7] to determine the rate of growth and the chemical composition of the oxide layer. However, it is believed that the oxide layer formed on the work rolls grows under conditions different from isothermal, given the temperature changes on the roll surface that vary from 60 to 650°C [8,9]. This drastic thermal cycling promotes the development of stresses acting on both, the steel and the oxide scale formed on the surface.…”

Section: Introductionmentioning

confidence: 99%

Failure Modes of the Oxide Scale Formed on a Work Roll Grade High Speed Steel

2011

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The behaviour of an oxide scale grown on the surface of a high-speed steel subjected to thermal cycling was studied. The oxide layer formed on the steel by means of the exposure of samples of this material to a mixture of dry air and water vapour at either 615 or 550°C. The samples were held for 1 h at either temperature and were cooled to room temperature by quenching with distilled water. This procedure was repeated for up to forty cycles. The oxide layer was subjected to the action of thermal stresses generated during either the cooling or heating stages. It was found that both, the composition of the oxide layer and the amount of oxide spalled from the surface depended on the number of cycles imposed to the samples. The mechanisms that promote oxide spallation and the preferential composition of the oxides that remain on the surface of the steel after spallation are analyzed and discussed.

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Modelling heat transfer in hot rolling work rolls

Cited by 38 publications

References 6 publications

High Temperature Oxidation of a Work Roll Grade High Speed Steel

High Temperature Oxidation of a Work Roll Grade High Speed Steel

Modeling the thermal and thermoelastic responses of work rolls used for hot rolling steel strip

Failure Modes of the Oxide Scale Formed on a Work Roll Grade High Speed Steel

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