Mechanisms of Surface Deterioration of Roll for Hot Strip Rolling.

Katoh, Osamu; Yamamoto, Hiromitsu; Ataka, Matsuo; Nakajima, Kõe

doi:10.2355/isijinternational.32.1216

Cited by 50 publications

(24 citation statements)

References 1 publication

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“…8,9) The increased rolling force is attributed to the increase in the friction coefficient between the roll and rolled material, and poses problems such as size imprecision and defects of rolled products. To improve wear resistance of the roll, thus, surface roughness should also be taken into consideration, and requires a different interpretation from that used in conventional wear mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Effects of Tempering Temperature on Wear Resistance and Surface Roughness of a High Speed Steel Roll.

Lee

Park

et al. 2001

ISIJ International

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The effects of tempering temperature on wear resistance and surface roughness of a high speed steel (HSS) roll manufactured by centrifugal casting method were investigated in this study. Hot-rolling simulation test was carried out using a high-temperature wear tester capable of controlling speed, load, and temperature. The test results revealed that the peak-tempered roll specimen showed the best wear resistance because of its hard matrix. However, its surface roughness deteriorated as the scratching wear proceeded, thereby leading to increase in friction coefficient. In the over-tempered specimens containing numerous fine spherical carbides in the matrix, the abrasive wear occurred predominantly as fine carbides were fallen off from the matrix, and thus the surface roughness was enhanced by the homogeneous wear of both matrix and carbides. These findings suggested that the tempering treatment at temperatures slightly past the peak hardness point would be more desirable in order to improve the wear resistance with consideration of the surface roughness of the HSS roll.

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Section: Introductionmentioning

confidence: 99%

Effects of Tempering Temperature on Wear Resistance and Surface Roughness of a High Speed Steel Roll.

Lee

Park

et al. 2001

ISIJ International

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“…The maximum contact stress was 140 MPa as determined by the Hertz formula [8], which was within the range of 100 to 350 MPa [9][10][11] of contact pressures between the work rolls and the workpiece during hot rolling.…”

Section: Methodsmentioning

confidence: 99%

Test research on sticking mechanism during hot rolling of SUS 430 ferritic stainless steel

Liu

Zhang

Han

2010

Int J Miner Metall Mater

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The sticking phenomenon during hot rolling of SUS 430 ferritic stainless steel was investigated by means of a two-disc type high-temperature wear tester. The test results indicate that sticking particles on the surfaces of high chromium steel (HiCr) and high-speed steel (HSS) rolls undergo nucleation, growth, and saturation stages. Grooves on the roll surface generated by grinding provide nucleation sites for sticking particles. The number of sticking particles on the HiCr roll surface is greater than that on the HSS roll surface. The average surface roughnesses (R a ) of HiCr and HSS rolls change from 0.502 and 0.493 μm at the initial stage to 0.837 and 0.530 μm at the saturation stage, respectively. The test further proves that the sticking behavior is strongly dependent on roll materials, and the HSS roll is more beneficial to prevent particles sticking compared with the HiCr roll under the same hot-rolling conditions.

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“…During the hot rolling, the surface temperature of work rolls can exceed 700 °C in a very short contact time (10 −2 –10 −3 s) because of the heat conducted from hot strips, deformation heat, and friction heat, and then they are cooled to room temperature by spraying water for the rest of time in each cycle (2–10 −1 s) . The total time of the work rolls in high temperature is less than 30 min in one period of roll changing, and oxide scale formed on the roll surface can be broken by friction and thermal fatigue.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16] During the hot rolling, the surface temperature of work rolls can exceed 700 8C in a very short contact time (10 À2 -10 À3 s) because of the heat conducted from hot strips, deformation heat, and friction heat, and then they are cooled to room temperature by spraying water for the rest of time in each cycle (2-10 À1 s). [17] The total time of the work rolls in high temperature is less than 30 min in one period of roll changing, and oxide scale formed on the roll surface can be broken by friction and thermal fatigue. The purpose of this paper is to investigate the oxidation mechanism of IC roll material through a combined study of oxidation kinetics, and surface morphology and crosssections of the oxide scales formed by carrying out the isothermal oxidation in both dry and humid atmospheres at a temperature range from 550 to 700 8C up to 30 min.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation of Indefinite Chill Roll Material Under Dry and Humid Atmospheres

Líu

Jiang

Chen

et al. 2015

steel research int.

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In this paper, the isothermal oxidation of the indefinite chill (IC) roll is investigated by using a thermogravimetric analyzer (TGA) from 550 to 700 °C under dry and humid atmospheres. It is found that the oxidation kinetics follow a linear trend and the oxide scale consists of two layers after the oxidation in dry air but three layers in humid air above 600 °C. In dry air, the graphite is covered by the oxide scale above 650 °C. The water vapor accelerates the oxidation of the matrix and the graphite. The graphite is covered by the extension of the oxide scale above 600 °C in humid air. The as‐treated samples are examined with SEM and XRD, while the kinetics is based on TGA results.

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Mechanisms of Surface Deterioration of Roll for Hot Strip Rolling.

Cited by 50 publications

References 1 publication

Effects of Tempering Temperature on Wear Resistance and Surface Roughness of a High Speed Steel Roll.

Effects of Tempering Temperature on Wear Resistance and Surface Roughness of a High Speed Steel Roll.

Test research on sticking mechanism during hot rolling of SUS 430 ferritic stainless steel

High Temperature Oxidation of Indefinite Chill Roll Material Under Dry and Humid Atmospheres

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