what is function of scale pit in steel mills

Water (scale) pit in steel rolling mill? Yahoo Answers

03/01/2010  the first pit is called the scale pit because the water also collects the free scale off the steel. this scale has to be collected and dealt to, usually settling in the pit. the working height of the pit must be below the bottom of the HSM, so water and scale can be washed / flow into the pit, this means that the working level of the pit is say 15 meters below ground level. the volume of the ...

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Mill scale - Wikipedia

Mill scale, often shortened to just scale, is the flaky surface of hot rolled steel, consisting of the mixed iron oxides iron(II) oxide (FeO), iron(III) oxide (Fe 2 O 3), and iron(II,III) oxide (Fe 3 O 4, magnetite).. Mill scale is formed on the outer surfaces of plates, sheets or profiles when they are being produced by rolling red hot iron or steel billets in rolling mills.

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What exactly is Mill Scale and what is done about it

Mill scale immediately starts at the steel making stage of casting hot metal steel grades and steel alloys when the metal is in a liquid stage. The mill scale chemistry will be the exact makeup of the steel and/or steel alloys being made. It is the outer skin of the casting and is formed by the rusting of the iron as it is exposed to the humidity and Oxygen of the air. Steel makers allow this ...

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Steel and Manufacturing Industry Solutions Water and ...

The scale pit is used to remove the larger scale and particulate, as well as to skim the oil from the water and is normally sized for 30–45 minutes of retention time. In some mills, this pit also receives wastewater from the hot roll and other miscellaneous processes throughout the mill. This can contribute organics, heavy metals, and other contaminants to the scale pit which must be ...

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What Is Function Of Scale Pit In Steel Mills – Grinding ...

Leave a message Chat Now. scale pit from steel mill,particles ricochet and hit the surfacr again to remove the mill ... What Is Function Of Scale Pit In Steel Mills. » Learn More. Severstal Transfer pit for Strand 3 at COntinuous Caster_VID ... Continuously casting steel slabs casue's slag and burrs (kerf) ... This is the Transfer pit for Strand 3 at the Continuous Caster Severstal NA ...

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Water (scale) pit in steel rolling mill? Yahoo Answers

03/01/2010  the first pit is called the scale pit because the water also collects the free scale off the steel. this scale has to be collected and dealt to, usually settling in the pit. the working height of the pit must be below the bottom of the HSM, so water and scale can be washed / flow into the pit, this means that the working level of the pit is say 15 meters below ground level. the volume of the ...

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What exactly is Mill Scale and what is done about it

Mill scale immediately starts at the steel making stage of casting hot metal steel grades and steel alloys when the metal is in a liquid stage. The mill scale chemistry will be the exact makeup of the steel and/or steel alloys being made. It is the outer skin of the casting and is formed by the rusting of the iron as it is exposed to the humidity and Oxygen of the air. Steel makers allow this ...

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Steel and Manufacturing Industry Solutions Water and ...

The scale pit is used to remove the larger scale and particulate, as well as to skim the oil from the water and is normally sized for 30–45 minutes of retention time. In some mills, this pit also receives wastewater from the hot roll and other miscellaneous processes throughout the mill. This can contribute organics, heavy metals, and other contaminants to the scale pit which must be ...

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The Pickling Process - California Steel Industries, Inc.

three coils produced at the Hot Mill. Its primary function is to remove the thin layer of oxidized iron, or scale, that forms on the surface of the steel at the temperatures employed during hot rolling. The unit is capable of pickling 1.2 million tons per year of steel up to ¼” thick and 62” wide. This includes all Cold Roll and Galvanize products, as well as Pickled and Oiled hot roll (P ...

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Macro Defects in Steel - Rolling Defects

Medium scale (scale pits) - Hot strip mill - Rolling defects Methods for preventing defect propagation - Rolling defects Multiple cracks - Hot rolled products - Rolling defects Multiple cracks - Hot rolled products - Rolling defects Non-metallic inclusions - Heavy plate defects - Rolling defects Oil mark - Rolling defects One-side edge waves - Heavy plate defects - Rolling defects Orange peel ...

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A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

Secondary scale on hot strip and the impact on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest - also, maybe later. K. H. Schröder July 2003 K. H. Schröder: A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

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Steel - Manufacturing Processes - Oxygen, Ingot, Rolls ...

Mill scale, a form of iron oxide (Fe 3 O 4), is used to reduce carbon content. Aluminum ferrosilicon is added if the steel is to be "killed." A killed steel is one that has been deoxidized to prevent gas evolution in the ingot mold, making a more uniform steel. "Rimmed" steel is steel that has not been deoxidized and gas pockets and holes from free oxygen form in the center of the ingot while ...

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Mill Scale

Presidio Fire Pit See Details Whether you need a smoker on skids to put in a pit room, or one that can be taken on the road to cook anywhere, we’ve got you covered

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Water Requirements of the Iron and Steel Industry

Hot-rolling mills_____ 352 Other uses_____ 353 Quantity of water used _____ 354 ... steel processing plants it ranged from 4,180 to 26,700 gallons per ton. Water reuse also varied widely from 0 to 18 times in integrated steel plants and from 0 to 44 times in steel processing plants. Availability of water seemed to be the prinicpal factor in determining the rate of reuse. Of the units within ...

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Pickling and Passivating Stainless Steel

Stainless steel surfaces form a grey/black scale during hot rolling or forming. This tenacious oxide scale is removed in the steelmill by descaling. A matt grey is left on annealed mill products following descaling and pickling. Mechanical scale loosening roughens the surface. The terms'descaling', 'pic kling' and 'passivation' are often confused, but are distinct processes. It is important to ...

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A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

Secondary scale on hot strip and the impact on wear is another issue. Stresses from Hertzian pressure in 4-high cold mill back up rolls were measured years ago, the results were never published, but of high interest - also, maybe later. K. H. Schröder July 2003 K. H. Schröder: A BASIC UNDERSTANDING OF THE MECHANICS OF ROLLING MILL ROLLS

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Steel - Manufacturing Processes - Oxygen, Ingot, Rolls ...

Mill scale, a form of iron oxide (Fe 3 O 4), is used to reduce carbon content. Aluminum ferrosilicon is added if the steel is to be "killed." A killed steel is one that has been deoxidized to prevent gas evolution in the ingot mold, making a more uniform steel. "Rimmed" steel is steel that has not been deoxidized and gas pockets and holes from free oxygen form in the center of the ingot while ...

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Steel Rolling Mill Machinery process - RMT Tools

The roughing mill is made up of Multiple independent rolling mill stands, Billets heated in the furnace until they glow bright orange-yellow are rolled through one stand at a time to produce transfer bars suitable for finish rolling. High-pressure water-jet nozzles clean the oxidized iron, or scale, from the surface along the way.

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The Hot Rolling Process - California Steel Industries, Inc.

The primary function of the Hot Strip Mill is to reheat semi-finished steel slabs of steel nearly to their melting point, ... finishing mills, which will roll the steel in tandem with one another. The workhorse roughing mill has 135” wide rolls for rolling ‘broadside’ (as the first roughing mill is commonly called) to make a slab wider. A 5,000 hp motor drives 42”-diameter work-rolls ...

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Accumulating strip before the mill

The rest of this article describes the various types of strip accumulators that are available. Pit or Tower. Strip can be stored in a deep pit where it will hang in a loop (see Figure 1).. If the pit is "filled" so that the strip loop is at position A, the mill can then be started and operated continuously.

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Pickling of Steel QA's

17/08/2016  The steel mill removes the scale before they stock or ship the steel to you. So the user is not involved with scale removal, and some will say the user is not involved with pickling. But during shipping, and during storage before and after shipping, rust will start to build up on the steel and you wish to remove this. Generally an acid dip to ...

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Steel Glossary Glossary of Terms Platts

The principal function of these mills is to roll hot semis down to the correct entry dimensions for subsequent rolling stages, while removing as much surface scale as possible. These are reversing mills, ie the steel goes back-and-forth through the mill (multiple passes) until the

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What is a load cell? How does a load cell work? HBM

"Consider a truck scale: These scales are exposed to the elements: rain, dirt or heat – they have to be able to withstand outdoor ambient conditions. And we are talking world-wide: A truck scale in Siberia, for example, is exposed to different effects than one in South Africa. But they do have one thing in common: They must be designed for environments with severe weather and must therefore ...

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Feed Mills - an overview ScienceDirect Topics

21/12/2010  Feed mills also commonly utilize truck and rail scales (for ingredient inventories) with flow-through floors, with the hopper pit and at least one screw conveyor underneath; these systems are housed within the same receiving structure, which can be of either steel or concrete construction (Fig. 13.6). Major constituents (such as cereal grains and soybean meal) and minor ingredients (such as ...

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