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  • Quality Improvement in Finished Cold Rolled
    Quality Improvement in Finished Cold Rolled

    is the customer of the Hot rolling mill, Hot rolled product is the customer of Cold rolling mill and cold rolled product is the customer of the inspection department. If these customers are satisfied, external customers will automatically be satis-fied. [1] tification of Defects helps reject defected pieces and manage

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  • HOT ROLLING SURFACE QUALITY ISSUES1
    HOT ROLLING SURFACE QUALITY ISSUES1

    rolling mill, the reheating furnace operation and hot rolling mill can be the root cause of surface quality issues and/or poor mechanical properties including toughness. The inefficient and non-homogeneous heating of the steel before rolling is often one of the reasons for mechanical property rejects and diverts

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  • Cold Rolling and Its Possible Defects
    Cold Rolling and Its Possible Defects

    Compared to hot rolling, cold rolling has advantages of excellent mechanical properties, accurate size, and good surface quality. However, metal surfaces might exhibit the following defects; Cold-rolled Strip Abrasions . These are grazes, tears, grooves, or scratches of differing sizes that arise either during or after cold rolling

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  • Hot Rolling Defects - Hot Strip Mill | steelwarehousetech
    Hot Rolling Defects - Hot Strip Mill | steelwarehousetech

    A lamination-like defect that is transverse to the rolling direction. Reheat furnaces that use arms to push slabs through the furnace (as opposed to walking beam furnaces) can cause tears on the bottom side of the slabs. If the hot strip mill has a coil box, the furnace tears will be visible on the top surface of the coil

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  • 6 Common Types of Steel Defects - Pacesetter
    6 Common Types of Steel Defects - Pacesetter

    The repeat distance and pattern gives clues about the defect’s root cause. On repeating roll marks, the distance from mark to mark gives a clue as to which roll (at the mill or processing line) induced the mark. Buckle. A buckle is a series of waves, usually transverse to rolling direction, varying in severity and frequency

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  • Surface and Inner Deformation during Shape Rolling of
    Surface and Inner Deformation during Shape Rolling of

    End cracking is a quite common defect during wire-rod rolling of HSS. The consequence from this defect does not only include the loss of material but also the risk of damaging the rolls and the rolling mill [2]. For end cracking to occur there must be a

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  • 2006 Analysis of hot rolling events that lead to ridge
    2006 Analysis of hot rolling events that lead to ridge

    2.1.3 Crystallographic textures on hot rolling 16 2.2 Roll wear on hot rolling mills 18 2.2.1 Work-roll wear mechanisms 19 2.2.2 The influence of temperature on roll wear 22 2.3 Oxide formation, morphology and integrity during hot rolling 25 2.3.1 Iron oxidation 25 2.3.2 Mechanism of scale formation 27 2.3.3 Kinetics of scale formation 31

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  • Roughing Mill - an overview | ScienceDirect Topics
    Roughing Mill - an overview | ScienceDirect Topics

    John G. Lenard, in Primer on Flat Rolling (Second Edition), 2014 2.7 Generation III – Coil Box Hot Strip Mills. In the 1970s, Stelco of Canada developed the hot coil box designed for installation in hot strip mills ahead of the finish mill for coiling the transfer bar from the roughing mill and uncoiling it into the finishing mill. The coil box reduced the distance between the roughing mill

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  • Rolling of Metals
    Rolling of Metals

    Defects in Rolling •Surface defects –scale, rust, scratches, gouges, pits, and cracks •Wavy edges –due to roll bending •Alligatoring –complex phenomenon that may be due to non-uniform deformation or defects in the billet Figure 13.8 Schematic illustration of typical defects in flat rolling: (a) wavy edges; (b)

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  • Rolling - BrainKart
    Rolling - BrainKart

    5.Universal Rolling Mill. 6.Planetary Rolling Mill. 1.Two High Rolling Mill. 2. DEFECTS IN ROLLED PARTS. There are two types of major defects on the rolled products. (a) SURFACE DEFECTS (b) INTERNAL SURFACE DETECTS. (a) SURFACE DEFECTS Major surface defects on rolled products are scales, rust, scratches,cracks, and pits. These defects occurs on

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  • Technical Report UDC 669 . 14 - 462 . 3 : 681 . 3
    Technical Report UDC 669 . 14 - 462 . 3 : 681 . 3

    The mandrel mill is a continuous rolling mill in which a mandrel bar is inserted into the hole in the hollow tube, and the tube wall thickness is reduced by the mandrel bar and caliber ... using a regression equation of defects threshold based on experi-mental data. Another problem was that model mills could not be used in experiments performed

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  • On line prediction of surface defects in hot bar rolling
    On line prediction of surface defects in hot bar rolling

    Sep 13, 2013 These defects form very early in the rolling mill (mostly in roughing passes) and elongate in subsequent passes as the bar is being rolled. They are usually located at a certain angle to the parting line and are symmetric across the parting line (Fig. 8 )

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  • Rolling Process - SlideShare
    Rolling Process - SlideShare

    Nov 16, 2017 Rolling mills •Requires very rigid construction, large motors to supply enough power (MN). ... ROLLING DEFECTS Alligatoring: • rupture of material along the length into an upper half and a lower half resembling the open mouth of an alligator. Folds: This defect is encountered when the reduction per pass is very low

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  • Metal Rolling - Manufacturing Process
    Metal Rolling - Manufacturing Process

    At a rolling mill, blooms and slabs are further rolled down to intermediate parts such as plate, sheet, strip, coil, billets, bars and rods. Many of these products will be the starting material for subsequent manufacturing operations such as forging, sheet metal working, wire drawing, extrusion, and machining. ... Defects In Metal Rolling

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  • Different types of rolling mills and defects in rolled
    Different types of rolling mills and defects in rolled

    Jun 05, 2020 1.1 Two-high rolling mills: 1.2 Three-high rolling mills: 1.3 Four high rolling mills: 1.4 Tandem rolling mills: 1.5 Cluster rolling mills: 2 Defects on rolled metals: 2.1 Wavy edges crack: 2.2 Zipper crack in the centre of the strip: 2.3 Edge crack:

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  • 16 Types Of Steel Defects: Pay Attention When Choosing
    16 Types Of Steel Defects: Pay Attention When Choosing

    It is reasonable to remove the shrinkage completely, but steel mills often pursue the success rate and leave a residue, leaving an irreversible disaster for the subsequent process. Figure 4 is φ70mm W18 steel shrinkage residue and serious porosity picture (heat etching with 1:1 HCl), Figure 5 is φ70mm W18 steel shrinkage residue after rolling

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  • Chatter problems on a cold rolling mill - Innoval
    Chatter problems on a cold rolling mill - Innoval

    They looked for defects in the work roll bearings inner races that were likely to create similar markings to the ones experienced in the cold rolling mill, as shown in figure 3. These defects were present in all the mill work rolls and were likely

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  • Cold rolled sheet (roll) common defects, characteristics
    Cold rolled sheet (roll) common defects, characteristics

    Apr 17, 2019 2 Rolling steel: The residual crucible on the surface of the slab is not cleaned and remains on the steel plate after rolling. Iron oxide scale. The defects are spotted, strip-like or scaly black spots, the distribution area is not the same, and the depth of the pressing is different

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  • Rolling (metalworking) - Wikipedia
    Rolling (metalworking) - Wikipedia

    In a traditional rolling mill rolling is done in several passes, but in tandem mill there are several stands ( =2 stands) and reductions take place successively. The number of stands ranges from 2 to 18. Tandem mills can be either of hot or cold rolling

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  • (PDF) Analysis of the Surface Defects in a Hot-Rolled Low
    (PDF) Analysis of the Surface Defects in a Hot-Rolled Low

    Many surface defects caused by hot rolling are related to oxidation in the reheating furnace. One of these is the melting of eutectic FeO/Fe2SiO4 during reheating over 1170 C giving as a result

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  • Rolling Process: Definition, Working Principle
    Rolling Process: Definition, Working Principle

    Rolling Process Definition. The rolling process is a metalworking operation in which metal strips pass through a set of rollers to reduce sheet thickness and achieve uniform thickness throughout the sheet. The sheet is deformed along the linear axis. Typically after the rolling, metal sheets go through annealing which is done under a closed environment of nitrogen

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  • Rolling Process: Working, Application, Defects, Type
    Rolling Process: Working, Application, Defects, Type

    There are two types of rolling defects. Those are as follows: Surface rolling defects; Internal structural rolling defects. Surface Defects: Surface defects in rolling can be categorized into following types, and those are: Internal Structural Defects: There are some types of internal structure defects. Those are as follows: Wavy Edges Crack:

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  • 1. Hot rolling and rolling defects: 1.1 Front and back
    1. Hot rolling and rolling defects: 1.1 Front and back

    1.8 Rolling defects: Mill spring is a defect in which the rolled sheet is thicker than the required thickness because, the rolls get deflected by high rolling forces. Elastic deformation of the mill takes place. If we use stiffer rolls, namely roll material of high stiffness or elastic constant, we could avoid mill spring

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  • Study of Rolling Mill Defects: A Survey Approach
    Study of Rolling Mill Defects: A Survey Approach

    Principle of Rolling IV. Types of Rolling Mill Defects: The different types of the rolling mill defects are expressed in below: A. Edge Wave (EWV) If rolls are elastically deflected, the rolled plates become thin along the edge, whereas at centre the thickness is higher. Similarly, deflected rolls results in longer edges than the centre

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  • Common Rolling Defects and How to Combat Them
    Common Rolling Defects and How to Combat Them

    One of the most common rolling defects is the occurrence of fibers at the edge, which are longer than those at the center. This occurs when concave rolls bend leading to elastic deformations. Thickness at the center implies that the edges are more elongated

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  • Abnormalities and Failures of Rolling Mill Rolls –
    Abnormalities and Failures of Rolling Mill Rolls –

    Dec 09, 2019 Rolling abnormalities can also cause roll breakage. Other reasons for roll failures include unreasonable design of rolls and the roll grooves, excessive single pass deformation, deep fire cracks, fatigue and spalling etc. Some of the important reasons for roll abnormalities and failures are described below

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  • Analysis of common surface defects of hot rolled
    Analysis of common surface defects of hot rolled

    Aug 11, 2020 Defects such as bag, net pattern, heavy skin or turning skin will form scars during rolling. During the rolling process, the surface of the finished hole is scratched at a certain pass. The fins are attached to the surface of the rolled piece, or the rolling groove The surface is severely abraded, and then rolled into scars, some of which are caused by improper cleaning

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  • Defects in Hot Rolled Products1 | PDF | Rolling
    Defects in Hot Rolled Products1 | PDF | Rolling

    Defects in Hot Rolled Products Rolled in scale (RIS) Sliver / Seams Blister Edge Cracks Spongy Edge Rolled in Extraneous Material roll Marks Indentation Mark Scratch Mark Folds Lamination Camber Flatness Ovality BCL TCC Zig Zag Wrapping Bulging. Copyright: Attribution Non-Commercial (BY-NC) Available Formats. Download as DOC, PDF, TXT or read online from

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  • Macro Defects in Steel - Rolling Defects
    Macro Defects in Steel - Rolling Defects

    Rolling Defects. A carbon-rich centerline - Rolling defects. A surface crack - Rolling defects. Alligatoring - 9Cr-1Mo steel - Rolling defects. Alligatoring - Rolling defects. Alligatoring - Rolling defects. Alligatoring in a rolled slab - Rolling defects. Anneal-stained edges (temper colours) - Cold rolled uncoated sheet - Rolling defects. BCL - Hot rolled products - Rolling defects

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