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6 Common Steel Defects Encountered During Quality ...

May 02, 2017 · 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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Defects and Discontinuities - Hashemite University

Defects and Discontinuities Page 7 of 12 Lamellar Tearing Lamellar tearing is a subsurface discontinuity that occurs in rolled plates having high content of nonmetallic inclusions. Those inclusions have low strength and they are fattened during rolling, thus they can be torn underneath the welds because of shrinkage

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ON-LINE CLASSIFICATION OF SURFACE DEFECTS IN HOT .

quality concerns in the rolling industry (Jin et al. 2008). Four major types of surface defects exist in rolling processes: blob, longitudinal, repeating, and transverse. Each of these types of surface defects is further divided into the corresponding subtypes. For example, the longitudinal type of defect can be further categorized as burnt steel,

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Hot rolling and rolling defects - nptel.ac

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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Laps On Rolled Steel Products | Speaking of Precision Blog

Laps On Rolled Steel Products ... (rolling). A longitudinal discontinuity in the bar may exist prior to folding over but the defect generally is developed at the mill."- AISI Technical Committee on Rod and Bar Mills, Detection, Classification, and Elimination of Rod and Bar Surface Defects.

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Behaviour of Surface Defects in Wire Rod Rolling | Mirjana ...

Surface defects in wire rod and bar rolling are common and well-known to mill people. Nowadays, surface defects are not accepted on high-alloyed steel wire rods. The steel making, casting and ...

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Detection and Classification of Surface Defects of Cold ...

Surface defect detection devotes a high percentage of quality control to itself. in this paper a fast and highly accurate approach for detection of this kind of defects is offered by using image ...

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cold rolling defects- Aluminum/Al foil,plate/sheet ...

Hot rolling and rolling defects - NPTEL. 1. Hot rolling and rolling defects: 1.1 Front and back tensions: We have seen that the rolling load is dependent on roll diameter, higher the roll dia, higher the . Chat Now Send Inquiry; Flatness Defect in Thin Strip Cold Rolling and the...

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cold rolling defects- Aluminum/Al foil,plate/sheet ...

Hot rolling and rolling defects - NPTEL. 1. Hot rolling and rolling defects: 1.1 Front and back tensions: We have seen that the rolling load is dependent on roll diameter, higher the roll dia, higher the . Chat Now Send Inquiry; Flatness Defect in Thin Strip Cold Rolling and the...

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Roll Defects Affecting Production Efficiency And Quality

Similar to barring, the third removable roll defect is known as chatter. It resembles the effects of barring, but with much closer frequency. These roll marks are caused by your grind provider, rolling mill vibrations at some frequency or marks on your roll's surface (either on the face or bearing seat).

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Rolling Process Modeling Report: Finite-Element Prediction ...

perform finite-element simulations to predict roll-separating forces and rolling defects. Simulations were performed using a finite-element model developed using the commercial code LS-Dyna. Simulations of the hot rolling of U-10Mo coupons encapsulated in low-carbon steel have been conducted following two different schedules.

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An Overview of Forging Processes with Their Defects

Forging defects those are repeatedly occurring are discussed along with their causes and remedies. Then the fish-bone diagram is used to explore the possible causes of defects like unfilling, mismatch and scale pits through a brainstorming session and to determine the .

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Defects Introduced into Metals During Fabrication and .

UNESCO – EOLSS SAMPLE CHAPTERS MATERIALS SCIENCE AND ENGINEERING – Vol. III – Defects Introduced into Metals During Fabrication and Service - A.J.Wilby and D.P. Neale ©Encyclopedia of Life Support Systems (EOLSS) serious. Three-dimensional (volumetric) defects create a lesser notch effect, but can

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Steel Defects | Speaking of Precision Blog

Typically rolling mill reheat cycles offer plenty of time to develop a subscale in a prior existing defect. However, for defects that are created during rolling, the limited time at temperature and the decreasing temperatures on cooling make formation of subscales unlikely. Reading Decarb and Subscale to Understand the Defect

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6 Common Steel Defects Encountered During Quality ...

May 02, 2017 · 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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Macro Defects in Steel - Rolling Defects

Surface defect types in stainless steel - Rolling defects Surface defect lack of material - Rolling defects Surface defects of hot rolled steel plates - Rolling defects Surface inclusion defects - Rolling defects Surface laps - Rolling defects Surface marks due to broken rolling stands - Rolling defects Surface wrinkle defect of carbon steel ...

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Cold rolling shape defects of stainless steel wide strips

Abstract—when cold rolling stainless steel wide strips, some flatness defects can occur. A flat strip means that when lying on a flat horizontal surface the strip touches the surface at every point. Flatness defects cause shifting, strip breakage, and axial forces. The direct consequences are a loss of material, a waste of time, and a lot

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Sheet Metal Rolling Defects: Causes & Remedies

To make sure the sheet metal manufacturing process is smooth, a rolling machine is used. This process flattens pieces of metal & ensures they're the right size. However, there are a few problems that can occur during rolling. Let's discuss potential sheet metal rolling defects, causes and remedies.

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SLITTING ROLL & WEB DEFECTS - AIMCAL

SLITTING ROLL & WEB DEFECTS D R R SLITTING EDUCATOR/CONSULTANT D Converting DAVE RUMSON drumson.wordpress ... Courtesy of TAPPI – The Ultimate Roll and Web Defect Troubleshooting Guide . X X X X X X Slitting and Trim Related Defects ... Slitting and Trim Related Defects 57 16 46 18 Specific Slitting Defects

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Rolling (metalworking) - Wikipedia

In metalworking, rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform. The concept is similar to the rolling of dough. Rolling is classified according to the temperature of the metal rolled.

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Alligatoring - 9Cr-1Mo steel - Rolling defects

Alligatoring - 9Cr-1Mo steel - Rolling defects Figure 1: Failure of AR material by alligatoring after about 40% reduction at room temperature rolling. Figure 2: Micrograph showing cracks associated with carbides. Figure 3: Multiple cracks at planes away from centre in the sheet failed by alligatoring.

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