rolling-mill train is 90 Tonnes/hour, and we estimate a formation of scale equal to 0.2% of the. production total, the maximum amount of scale that the contact water will remove is 18 Kg/hour ...
The contact water removes solid particles of different sizes, mainly scale. If we consider that the maximum capacity of the rolling-mill train is 90 Tonnes/hour, and we estimate a formation of scale equal to 0.2% of the production total, the maximum amount of scale that the contact water will remove is 18 Kg/hour, with a density of 7.65 g/cm3.
In the rolling-mill train the "billet" used as raw material is heated to 1080 ºC using natural gas in a glory hole with a radiant dome and three temperature control zones: preheating, heating and ... The water is then treated in the Scale Pit (or in the Receiver Pool in the case of the
The aqueous spray contains an effective amount of a surfactant sufficient to emulsify oily substances emitted by the rolling mill equipment and deposited on the rolling shaped object The spray composition and the flaked off mill scale age conveyed together to a settling tank or scale pit.
Scale cargo containing mainly ferric oxide that is collected from various places of iron-and-steel making process. Mill scale - a scale cargo collected from water used in hot rolling process and drainage pits, with small amount of oil ( used for rolling) is a main component of this cargo.
In the hot-rolling process, owing to oxidation reactions, mill scale is formed on the surfaces of semi-steel products in reheat furnaces and on rolling trains and stands [1,2,3].The mill scale is washed away from steel surfaces and flushed into flumes underneath the hot-rolling lines by a large amount of contact water, which includes descaling water and cooling water.
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.
Scale pit as appears as rough pitted surface of stainless steel with sediments of scale in the bottom side of the pitted portion. There are four type of scale growth on Steckle mill: 1. Primary scale: the scale crated in the furnace during heating. 2. Secondary scale: the scale grown during the rolling in the roughing mill after the primary ...
Stain - Temper mill - Rolling defects Star crack - Rolling defects Steel pit - Rolling defects Sticker - Hot rolled products - Rolling defects Sticker break - Electrolytic galvanizing line - Rolling defects Sticker break - Temper mill - Rolling defects Sticker breaks - Cold rolled uncoated sheet - Rolling defects Sticky scale - Rolling defects
traditional scale pit can be eliminated in the rolling mill area and replaced with alternative eqmpment at floor level. Thus, the necessity of having to use pumping as the only solution, provided a practical alternative method for removing and transporting scale. Coarse scale removal — …
Osogbo Steel Rolling Mill. Prompt : Caesar is a famous mining equipment manufacturer well-known both at home and abroad, major in producing stone crushing equipment, mineral separation equipment, limestone grinding equipment, etc. The Zuma Steel rolling mill in Jos and the Osogbo Steel rolling mill have been grounded, Daily Trust can report.
Mill scale accumulates from high-pressure descaling, fouling the cooling water. SOLUTION: Roll cooling water is pumped from a nearby scale pit through a LAKOS Separator to remove the mill scale. The unit purges into a separate section of the scale pit for easy removal and disposal. PROBLEM: Once steel is hot rolled, much of the plate product is ...
"The SteelMax skimmer has done a consistently thorough job of removing hydraulic oil from our Rolling Mill Scale Pits. It has collected enough oil for resale from the water system to cover 50% of its initial cost within one year." — D.B., Plant Mechanical Engineer, Steel Dynamics Inc.
Iron oxide scale is continually formed on the surface of the hot steel. This scale is repeatedly stripped away by the stresses of rolling. The scale falls, together with the emulsified oil, into collection pits beneath the rolling mill, whence the oil emulsion is recycled via sumps and filters. The scale accumulates and is periodically removed.
Between the crop shear and the first rolling stand of the finishing mill there is normally second scale breaker, whose task is the final scale removal. Water sprays above and below the transfer bar at around 200 kg/sq cm pressure break up the scale that has re-formed (secondary scale), as well as any scale that has persisted through earlier ...
However, secondary scale continues to form on the descaled steel surface during the inter-pass delay time in the roughing and intermediate rolling mills. The colour of primary mill scale is generally bluish black while that of the secondary scale is blue. The secondary scale gives the steel an appearance which is similar to that of a lacquer ...
steel rolling mill scale pit. Mill Scale Separation – Nordic Water. mill scale forms during steel production. it is a thin oxide coating that is created when steel is hot-rolled. when the steel is cooled down with water during the rolling process, the mill scale breaks off. the cooling water is re-used over and over again, which means that mill scale and oil residue particles need to be ...
• Percentage reduction in material loss due to mill scale by using anti-scale coating = 56.98% • On average, approximately a 70% reduction in mill scale is achieved by the use of anti-scale coating in open-die hot forging and hot rolling of stainless steel. This increases material yield and …
Foil rolling is a specialized type of flat rolling, specifically used to produce foil, which is sheet metal with a thickness less than 200 µm (0.0079 in) The rolling is done in a cluster mill because the small thickness requires a small diameter rolls To reduce the need for small rolls pack rolling is used, which rolls multiple sheets together ...
US3258123A US303904A US30390463A US3258123A US 3258123 A US3258123 A US 3258123A US 303904 A US303904 A US 303904A US 30390463 A US30390463 A US 30390463A US 3258123 A US3258123 A US 3258123A Authority US United States Prior art keywords oil sub chamber scale water Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.
Rolling mills consists of different type of Mills based on the desired products namely: A. Long Product Mill a) Light and Medium Merchant Mill/ Bar Mill. ... Scale pit/settling tank xii. Drive mechanisms Some of critical Equipment/ facilities in Re-rolling Mills are as follows: Sl. No. Area Major equipments
Mill scale Wikipedia. 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. Mill scale is bluish-black in color. It is usually less than 0.1 mm (0.0039 in) thick, and initially adheres to the steel surface and protects it from atmospheric ...
caster and rolling mill in a single combined system. Return water, af-ter contact with the process, drains through flumes to the 1.1 million gal-lon DCW scale pit, where separation of oil, water and iron fines occurs. Oil is removed from the surface of the water by two rotating drum skimmers, while scale is …
In a rolling mill where the steel will be stretched and squished the mill scale will first be removed mostly by water jets, or by sand blasting in some shops or by vibrating rolls in others and the mill scale will fall into a pit below the equipment where it will also be joined by rolling mill …
High-pressure piping will be made of pipe steel, in order to connect pipe flow to the valves for descaling and complete with heavy-duty PP clamps, fittings, hoses, etc. Descaling speed on the liner = 1.5–4 m/sec. Water descaling unit operates according to the required rolling speed/ mill capacity. MODEL 2.
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.
HO Scale Steel Mill Kits and Accessories. HO 4 High Mill Rolls, Loose. $6.25. HO Scale 4 High Mill Rolls For CMP. $6.25. HO Scale 1950s - 1970s Pit Cover Lifting Device. $8.75. 1950s - 1970s HO Scale Pit Furnace Cover. $8.75.
Scale is produced when the hot surface is oxidized by air. This mill scale can reduce corrosion if steel is exposed to air over short periods, however, the corrosion increases if exposed for long periods. Large amounts of mill scale also cause severe pitting corrosion if the surface is …
The advantage, with respect to the traditional scale pit solution, is a significant CapEx saving in civil works (-30%) and a substantial reduction of execution time (4 months). For more info Francesco Casarsa [email protected] +39 0432 195 8921
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