Tribological behaviour of hot rolling rolls

Pellizzari, M.; Molinari, A.; Straffelini, Giovanni

doi:10.1016/j.wear.2004.12.006

Cited by 101 publications

(50 citation statements)

References 10 publications

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“…the removal of pieces of work material induced by local oxidation, is also called corrosion. Wear is influenced by different parameters [1,2,6] compared to the two first mechanisms. It depends on the friction coefficient, slip, rolling pressure, product mix, wear resistance of the roll material and the roll surface temperature.…”

Section: Work Roll Operating Conditionsmentioning

confidence: 99%

Understanding of Work Roll Corrosion and Oxidation in a Hot Strip Mill

Flament¹,

Walmag²,

Sinnaeve³

2017

Anais Do Seminário De Laminação E Conformação

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More and more Hot Strip Mills are facing defects on their products that lead to a rejection of complete product batches by their customers. Several of those defects are induced by excessive work roll degradation. This paper is focussed on the understanding of work roll corrosion and oxidation mechanisms in a hot strip mill. Several laboratory trials (Hot rolling simulator, cyclic oxidation) have highlighted important factors influencing corrosion of work rolls as well as helping the understandings of oxidation of a work roll in the roll bite and along the roll circumference in a stand. The attention is focussed on several elements present in water used in HSM for direct roll cooling (e.g. chloride, bactericides, sulphates, phosphates…) and their effect on roll surface degradation. The second part of this paper is focused on the understanding of work roll oxidation along the roll circumference. The effects of roll composition, roll temperature, water composition and water temperature have been studied in order to understand the oxidation/corrosion mechanisms in a HSM.

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Section: Work Roll Operating Conditionsmentioning

confidence: 99%

Understanding of Work Roll Corrosion and Oxidation in a Hot Strip Mill

Flament¹,

Walmag²,

Sinnaeve³

2017

Anais Do Seminário De Laminação E Conformação

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“…Furthermore, nanosize carbides containing V or Mo precipitated on the left side of the V and Mo mapping images. Secondary carbides containing V, W, Mo or Ta are utilized for secondary hardening at high tempering temperatures [11][12][13][14][15] . Although we could not clarify the composition of the V-or Mo-containing carbides under these experimental conditions, these phases may be general secondary carbides.…”

Section: Effect Of Nitrogen On the Tempering-induced Microstructure Fmentioning

confidence: 99%

“…HCHSSs have similar chemical compositions to high-speed steel and include hard eutectic MC-and M 2 Ctype carbides (M is a carbide-generating element such as Cr, Mo, or V) between primary austenite dendrites [5][6][7][8][9][10] . Furthermore, austenite dendrites transform to hard martensite, in which ne secondary carbides precipitate after quenching and tempering, and exhibit superior hardening [11][12][13][14][15] . To improve the wear resistance of HCHSSs, it is necessary to control the species, volume fraction, and distribution of carbides crystallized in the solidi cation process and to optimize the heat treatment conditions [16][17][18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen on the Microstructure and Hardness of High-Carbon High-Speed Tool Steel Type Alloys

et al. 2016

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The effect of nitrogen addition on the microstructure formation and hardness during solidi cation and heat treatment was investigated and the possibility of nitrogen as an alloying element was discussed in terms of alloy chemistry for high-carbon high-speed tool steel type cast alloys. Nitrogen with a concentration from 48 ppm to 1542 ppm was successfully introduced by mixing Cr 2 N into a molten alloy. Analysis of the diffraction pattern revealed that the primary V 2 CN carbonitride crystallized upon the addition of nitrogen, whereas eutectic carbides mainly formed in N-free specimens. The chemical composition of the carbonitride is also affected by the addition of nitrogen. With increasing quenching temperature, the Vickers hardness gradually increased to a peak and then decreased. Nitrogen addition helps to increase the hardness similarly to carbon. A N-containing specimen also exhibited superior secondary hardening after tempering. It is known that a large amount of residual austenite nally transforms to a hard martensite phase after tempering. According to the results of XRD analysis, nitrogen addition increases the volume fraction of retained austenite in the matrix at a higher holding temperature. Furthermore, the precipitation of nanosize carbonitride was observed around the primary V 2 CN carbonitride in addition to the standard precipitation. Therefore, this carbonitride precipitation may induce the superior secondary hardening and ultimately increase the macrohardness of N-containing specimens.

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“…Second, the element segregation in a roll is serious due to a higher alloy content during the manufacture of the roll. Third, the service life of the roll is usually short because it is difficult to obtain both high surface hardness and core part toughness [1,2]. In light of this condition, centrifugal casting [3,4], a continuous pouring process for cladding (CPC) [5], and electroslag surfacing with the liquid metal method (ESSLM) [6] have been developed for the production of bimetallic compound rolls.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Compound Rolls Produced by Electroslag Remelting Cladding Method

Hou

Dong

Deng

et al. 2018

Metals

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Electroslag remelting cladding (ESRC) with a t-shape current carrying mold was adopted to make a compound roll including a working layer and mandrel. A comprehensive coupled transient model was established to reveal the basic phenomena of electromagnetic fields, flow fields, temperature fields, and multiphase flow. Meanwhile, the movement of the mandrel and working layer relative to the slag pool was simulated by dynamic mesh technology to reveal the interface bonding mechanism. The mechanism is as follows: The temperature of the mandrel increases and the mandrel melts slightly when the mandrel passes through the slag pool. The fusion layer is a mixture of molten steel of mandrel and working layer that is the connector between the mandrel and the working layer. Therefore, the interface bonding quality is dependent on a fusion layer that is affected by the voltage/power. The investigation indicates that the fusion layer thickness is between 2 and 4 mm in the condition of 40 V that benefits from obtaining a good interface bonding quality.

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Tribological behaviour of hot rolling rolls

Cited by 101 publications

References 10 publications

Understanding of Work Roll Corrosion and Oxidation in a Hot Strip Mill

Understanding of Work Roll Corrosion and Oxidation in a Hot Strip Mill

Effect of Nitrogen on the Microstructure and Hardness of High-Carbon High-Speed Tool Steel Type Alloys

Simulation of Compound Rolls Produced by Electroslag Remelting Cladding Method

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