A study of oxide scale deformation and surface roughness

A layer of oxide scale is inevitably formed on the strip surface due to the high temperature of the hot strip rolling process. Experimental result indicates that the oxide scale surface is rough no matter what the original state of the steel surface is. The oxide scale layer and its surface roughness play an important role in the hot strip rolling

Rolling of hot strip and strip defects IspatGuru

Fig 1 Forces and geometrical relationships in rolling of hot strip. At only one point along the surface of contact between the roll and the strip, two forces act on the material. These are (i) a radial force Pr, and (ii) a tangential frictional force F. Between the entrance plane (x-x) and the neutral point the strip is moving slower than the roll surface, and the tangential frictional force

A study of oxide scale deformation and surface roughness

A layer of oxide scale is inevitably formed on the strip surface due to the high temperature of the hot strip rolling process. Experimental result indicates that the oxide scale surface is rough no matter what the original state of the steel surface is. The oxide scale layer and its surface roughness play an important role in the hot strip rolling

“Frequently Asked Questions about Hot Strip Mill Work Roll

Work roll in hot strip mills wear due to friction between roll surface and hot strip. (Back up rolls wear as well, but under pressure with elastic deformation, the friction is much less.) The wear is uneven from one end of the barrel to the other. We all know the various wear pattern curves for different work roll materials many papers published these curves quite often. However, a nice

Effect of Processing Parameters on Scale Formation During

During hot strip processing, tertiary scale forms on the steel sur-face after descaling or between each mill stand, at temperatures below 1000 °C. The frictional phenomena and thermal conductivity at the interface between the roll and the steel will affect the rolling process, by changing rolling forces, torques, power consumptions, temperature gradient near the steel surface, roll wear and

Surface Defect Detection Method of Hot-Rolled Steel Strip

the surface of the hot rolled steel strip is prone to some defects. However, because the hot-rolled steel strip is an intermediate product, there is still further deep processing in the follow-up. Therefore, in the surface quality inspection of the hot-rolled steel strip, some defect types are not counted, so here is only for the six common hot-rolled steel strips The types of surface defects

Rolled Strip Flaw Caused Surface Dete Hot Work

KEYWORDS:hot strip; strip surface flaw; roll surface deterioration; mill scale; rolling load; rolling temperature; Si content friction coefficient; velocity difference. 1. Introduction In recent years demandshave increased for hot rolled products with better surface quality. The strip surface flaw caused by mill scale, which is formed in upstream stands of a hot strip mill, is one of the

“Frequently Asked Questions about Hot Strip Mill Work Roll

Work roll in hot strip mills wear due to friction between roll surface and hot strip. (Back up rolls wear as well, but under pressure with elastic deformation, the friction is much less.) The wear is uneven from one end of the barrel to the other. We all know the various wear pattern curves for different work roll materials many papers published these curves quite often. However, a nice

Rolled Strip Flaw Caused Surface Dete Hot Work

KEYWORDS:hot strip; strip surface flaw; roll surface deterioration; mill scale; rolling load; rolling temperature; Si content friction coefficient; velocity difference. 1. Introduction In recent years demandshave increased for hot rolled products with better surface quality. The strip surface flaw caused by mill scale, which is formed in upstream stands of a hot strip mill, is one of the

Forming Technology Stahlinstitut VDEh

Wide hot strip is produced in widths of from 600 to 2,300 mm and with thicknesses of from 0.8 to 12 mm. Narrow strip with widths of below 600 mm is produced on medium-wide hot strip mills. Heavy plate is produced in widths of up to 5,000 mm and thicknesses of from 3.5 to 250 mm. Only quarto reversing stands are used here, with two rolls acting as work rolls and two more as backup rolls. The

Iron oxide scale on the strip surface in hot strip

8/10/2019 Iron oxide scale on the strip surface in hot strip production. DATE:10/8/2019 HIT:401 SOURCE: AUTHOR: Performance: Iron oxide skin is generally adhered to the surface of the steel plate and distributed locally and completely on the surface of the plate. Some of the iron sheets are loose and easy to fall off, and some are pressed into the board surface and are not easy to fall off

Hot-dip galvanized steel strip Voestalpine

Some steel grades are available as galvanized hot-rolled strip: Hot-rolled low-alloyed or microalloyed steels; Hot-rolled ferritic-bainitic steels; Hot-rolled complex-phase steels ; Materials for hot forming. Press-hardening steels for hot forming are available in various strengths and are coated with zinc or zinc-iron. Best crash behavior, high dimensional accuracy and very good joining

Hot Steel AMETEK Surface Vision

Hot rolling of slabs to produce coils can affect the surface quality of the steel being produced. AMETEK Surface Vision’s inspection solutions help identify defects during

18. GALVANIZED COATING DEFECTS ASI Home

• The steel surface condition • The design of the item with respect to • The metallurgy of the galvanizing process. The hot dip galvanizing process involves immersing steel items in molten zinc at 450oC after pre-treatment to remove organic materials, rust and mill scale. This hot dipping process, where the steel is immersed in the molten zinc for several minutes, gives the galvanized

Cold rolled sheet (roll) common defects, characteristics

Due to inclusions in the molten steel during steelmaking, or scratches, chisel marks, etc. on the surface of the steel strip during hot rolling, when cold rolling, a spot-like trace is formed on the surface of the steel strip. Rolling in dirt. The defects are blocky, generally white, and easy to concentrate on a certain length of the steel strip. Since foreign matter (such as backing paper

Hot Rolled Steel vs. Cold Rolled Steel (Ultimate

Generally hot rolled in addition to fine bright materials with precise size, also has forging materials (the surface has forged marks). Strip Steel. Both hot rolled and cold rolled, cold rolled materials are generally thinner. Steel Plate . Cold rolled plates are generally thinner, such as car boards; Hot rolled medium thick plate, have the similar thickness of cold rolled, the appearance is

Managing the risk from hot water and surfaces in health

Managing the risks from hot water and surfaces in health and social care Introduction This information sheet explains the risks associated with hot water and hot surfaces in health and social care premises and sets out guidance to help control them. It covers the risks vulnerable people may be exposed to when bathing or showering, or where there are hot surfaces such as pipes or radiators

“Frequently Asked Questions about Hot Strip Mill Work Roll

Work roll in hot strip mills wear due to friction between roll surface and hot strip. (Back up rolls wear as well, but under pressure with elastic deformation, the friction is much less.) The wear is uneven from one end of the barrel to the other. We all know the various wear pattern curves for different work roll materials many papers published these curves quite often. However, a nice

Rolled Strip Flaw Caused Surface Dete Hot Work

KEYWORDS:hot strip; strip surface flaw; roll surface deterioration; mill scale; rolling load; rolling temperature; Si content friction coefficient; velocity difference. 1. Introduction In recent years demandshave increased for hot rolled products with better surface quality. The strip surface flaw caused by mill scale, which is formed in upstream stands of a hot strip mill, is one of the

On-line surface inspection of hot rolled strip

At the end of 2000, Ceracki et al. constructed an on-line surface inspection system for hot-rolled steel in Thyssen Krupp Steel hot strip mill, and it can improve sheet steel quality to a large

Surface Defects and their Control in Hot Dip Galvanized

slivers, hot strip mill mechanical defects, scratches, surface damage during cold rolling, etc. cause Zn- Fe alloy outbursts at the steel-coating interface and/ or different dendritic zinc crystal orientation. Temper rolling makes these areas more prominent as a result of light reflectivity differences. Even tiny pimples in the substrate stand out and are mistakenly identified as dross. Some

Iron oxide scale on the strip surface in hot strip

8/10/2019 Iron oxide scale on the strip surface in hot strip production. DATE:10/8/2019 HIT:401 SOURCE: AUTHOR: Performance: Iron oxide skin is generally adhered to the surface of the steel plate and distributed locally and completely on the surface of the plate. Some of the iron sheets are loose and easy to fall off, and some are pressed into the board surface and are not easy to fall off

Hot-dip galvanized steel strip Voestalpine

Some steel grades are available as galvanized hot-rolled strip: Hot-rolled low-alloyed or microalloyed steels; Hot-rolled ferritic-bainitic steels; Hot-rolled complex-phase steels ; Materials for hot forming. Press-hardening steels for hot forming are available in various strengths and are coated with zinc or zinc-iron. Best crash behavior, high dimensional accuracy and very good joining

2B, 2D and BA Cold Rolled Finishes

They are firstly hot rolled into a strip (or cast into a slab which is hot rolled into a strip) and then cold rolled. Cold rolling reduces the thickness by at least 50%. This smooths the surface, refines the grain structure and causes differences in the mechanical properties along and across the rolling direction. In the case of austenitic and duplex alloys, the process hardens and strengthens

NEU_surface_defect_database

In the Northeastern University (NEU) surface defect database, six kinds of typical surface defects of the hot-rolled steel strip are collected, i.e., rolled-in scale (RS), patches (Pa), crazing (Cr), pitted surface (PS), inclusion (In) and scratches (Sc). The database includes 1,800 grayscale images: 300 samples each of six different kinds of typical surface defects. Fig. 1 shows the sample

Managing the risk from hot water and surfaces in health

Managing the risks from hot water and surfaces in health and social care Introduction This information sheet explains the risks associated with hot water and hot surfaces in health and social care premises and sets out guidance to help control them. It covers the risks vulnerable people may be exposed to when bathing or showering, or where there are hot surfaces such as pipes or radiators

How to Clean a Stove Cooktop Stay at Home Mum

The easiest method is to use microfiber cloth same as the method above. Or, if your cooktop is caked with leftover food and hard-to-clean stains, then try Gumption. It is a multipurpose cleanser made with a special soap formulation breaking down grime.Simply add Gumption and water to a cleaning cloth and wipe the surface clean.