Life of rolls in a cold rolling mill in a steel plant-operation versus manufacture

Ray, Ashok K; Mishra, K K; Das, Goutam; Chaudhary, Pradeep

doi:10.1016/s1350-6307(99)00004-7

Cited by 28 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, in our basis realization of the hardened case, significant decrease in the endurance limit of the material is expected at depths 10-20 mm, where the maximum tensile stresses have magnitudes of 0.8-1 GPa; hence, a higher probability of spalling is expected at these depths. It is interesting to note, that in engineering practice local spalling and delamination in cold rolling mill rolls are often observed at the depth of 10-20 mm [1,[4][5][6].…”

Section: Discussionmentioning

confidence: 99%

“…The situation changes significantly when in some areas of the contact region the operating stress exceeds the local elastic limit and the material transfers into the elastic-plastic state. This not rarely happens in practice due to accidental overloads [4][5][6]. A very common issue in the steel industry is when the rolled strip folds ("pinches") in the roll bite due to strip breakage or non-uniform deformation of the strip across its width (see e.g.…”

Section: Introductionmentioning

confidence: 99%

“…A very common issue in the steel industry is when the rolled strip folds ("pinches") in the roll bite due to strip breakage or non-uniform deformation of the strip across its width (see e.g. [5][6]), which can occur for several technological reasons [7][8][9]. Figure 1 schematically shows the distribution of the yield strength along the depth of hardened zone (curve 1) and the values of the effective stress on the symmetry axis of the loading area (curve 2), corresponding to regular working conditions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of local overloads on cold rolling mill work rolls

Vinogradov

Knyazhansky

Tsun

2017

International Journal of Mechanical Sciences

View full text Add to dashboard Cite

Newcastle University ePrints -eprint.ncl.ac.uk Vinogradov V, Knyazhansky M, Tsun A. Effects of local overloads on cold rolling mill work rolls. AbstractLocal overloading is one of the most common reasons for premature failures of cold rolling mill work rolls. Case-hardened rolls demonstrate spatial variation of the material hardness and yield strength with a decreasing profile with depth and belong to the class of so-called plastically graded materials. Contact overloads cause formation of subsurface closed-shape plastic zones, accompanied by a significant perturbation in the stress field. In the present paper the effect of an overload on a case-hardened roll is numerically modelled using finite element, when the parameters of the contact loads are chosen to represent a common situation when an accidentally formed strip fold enters the roll bite. It is shown that plastic deformations in the graded layer originate at depths, which significantly exceed the depth of the maximum effective stresses, determined by the elastic solution. During the contact overload, tensile stresses develop at the upper boundary between the elastic and plastic zones. Tensile stresses at the free surface in the vicinity of the contact zone increase up to ten times due to formation of the subsurface plastic zone. Residual stresses with a very large tensile hydrostatic component are shown to appear in the unloaded material. These tensile stresses, both operational and residual, can cause premature spalling in the contact surface during either the overloading or further operation of the roll. It is shown that an increase in the depth of the hardened case and increase in the roll core hardness allows to reduce plastic deformations during overloads, reduce both operational and residual stresses in the graded layer and shift formation of the plastic zone deeper from the surface and the contact zone, which decreases the chances of premature spalling.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of local overloads on cold rolling mill work rolls

Vinogradov

Knyazhansky

Tsun

2017

International Journal of Mechanical Sciences

View full text Add to dashboard Cite

show abstract

“…Also, retained austenite being a metastable phase appears to be the main reason for spalling of indigenous rolls [33]. It has been reported that retained austenite possibly converts to martensite resulting in expansion of volume that creates internal pressure and causes spalling.…”

Section: Discussionmentioning

confidence: 99%

A study on the characteristics of electrical discharge textured skin pass mill work roll

Elkoca¹

2008

Surface and Coatings Technology

View full text Add to dashboard Cite

“…About 70 percent of the roll changes are due to roll marks and 30 percent are due to order changes (Greissel, 1999). In order to decrease the cost of inventory assets, it is mandatory to have a policy to keep inventories low, while having enough rolls to be able to respond to production changes and to extend the life of the rolls (Ray et al, 2000).…”

Section: Introductionmentioning

confidence: 99%