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Directly after hot-rolling, these lines anneal and pickle the strip before winding it into coils. Cold-strip-annealing and pickling lines Next up is another annealing and pickling process for the cold-rolled strip under different conditions.
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Scale formation and its removal in Hot rolling Process Santosh Chacko, Suresh Vasani, A.K.Ray Lechler (India) Pvt. Ltd., Thane, India ... There are two kinds of scales relevant in rolling mills – sticky ... Dry scales can be removed from the surface by application of descaling systems with low distances of the descaling nozzle to the material.
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Keywords: HSM (Hot Strip Mill), Descaling, Rolled in scale, Impact force, Erosion pattern 1. INTRODUCTION Descaling is a key process of hot rolling, especially when a good surface quality of the hot rolled products is demanded. Many studies have been made on the descaling technique of the hot strip mill (HSM) process (1-3). The key descaling ...
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The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semi-finished steel slabs of steel nearly to their melting point, then roll them thinner and longer through 12 successive rolling mill stands driven by motors totaling 77,000 hp, and finally coiling up the lengthened steel sheet for transport to the next process.
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When hot rolling steel in the laboratory, using relatively small rolling mills, values of 4–20 kW/m 2 K appear to be the correct magnitudes. If modelling hot rolling of steel under industrial conditions, values of 50–120 kW/m 2 K are more useful. In both cases, the layer of scale is an important parameter.
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Mechanical Processes for Descaling of Steel. Scale is the product of oxidation which takes place during hot rolling. The oxidation and scale formation of steel is an unavoidable phenomenon during the process of hot rolling which involve reheating of …
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Hot rolling. The base material of the hot rolled sheet is continuously cast slab. The base material demand of the Hot Rolling Mill is met by self-produced and imported slabs. Before being rolled into sheet, the slabs are heated to the temperature required for hot forming (1200 - 1270 °C) in two suitable pusher type furnaces operating with ...
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Descaling Steel hydromechanically With KAMAT high-pressure pump systems, slabs and billets in rolling mills can be efficiently descaled hydromechanically. With the annealing of steel, oxygen reacts with iron on the hot metal surface. Iron oxides, so-called scale, arise.
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Descaling device and method. A descaling device for slabs or strips in hot rolling mills includes nozzles fed by a pressurized water piston pump for directing water jets against the slab or strip for removing scale adhering to the surface of the slab or strip. At least one additional pressurized water piston pump is provided, wherein the piston ...
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The control system for descaling hot-rolled sheet mill Scientific adviser: Ph.D., Associate Professor Alexey Shushura . Abstract. ... is the effective removal of dross from the surface of billets and finished steel during rolling. Descaling after heat treatment and …
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descaling rolling mills mills rolling Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Pending Application number DE Other languages German (de) Inventor Domeika ...
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Hot rolling therefore involves the formation of mill scale (ferric oxide 2Fe 2 O 3), that has to be removed before the process is finished. In this step, which is referred to as "spray descaling", the rolled bar passes through a descaling system prior to further forming.
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Regarding hot rolling of steel, the quality of the rolled metal surfaces depends to a large extent on effective descaling. In order to avoid surface damage, iron oxide …
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This study focuses on the analysis of a high pressure six stage centrifugal pump for descaling in a hot rolling mill. To reduce computation time only a 2 stage fluid domain was used to conduct numerical analysis by steady and unsteady state analysis. The improved design (D2) showed an increase in efficiency by 2.3 percent and an increase in ...
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Rely on DescaleJet nozzles for long service life and easy maintenance. Our entire range of descaling nozzles provides: High-quality descaling resulting in smooth, streak-free surfaces. Efficient use of energy and water to reduce operating costs. Long service life …
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Hot Rolling Mill Other Applications DNX Descaling Nozzles Features Shapes & dimensions Higher impact force and deeper erosion for more efficient scale removal. Lower water consumption with the same impact of existing descaling nozzles. Sharper spray edge definition for optimized descaling perfor-mance. Maximum working pressure 25 MPa n n n 150 ...
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Within the hot rolling mill, descaling equipment is placed before the mill or after the mill stand and it takes the low pressure water from the plant water supply, creates high pressure water, which is sprayed onto the surface of the hot steel to remove the …
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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.
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Critical to Rolling Mill is its reheat furnace, Billets and Ingots are stacked on the Hot charging area of the plant with the help of overhead cranes. Billets placed parallel to each other on the CI lines in the furnace are continuously pushed inside the Reheating …
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HOT ROLLING. Optimal steel quality depends on optimal spray technology. Spraying Systems Co. offers a wide range of superior nozzles and headers for descaling and cooling — along with local steel experts to assist you with product selection, cooling …
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The rolling mill for mechanical descaling of hot rolled steel is constructed according to the slidable roll process with reducing rolls so that a unform operation with different and/or changing shape steel strips can obtained. This is attained when the rolling mill has at least two rolls slidable in opposite directions whose body surfaces are ...
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Descaling nozzles for every hot rolling mill From primary descaling behind the reheating furnace to mill descaling in roughing mills up to descaling prior to the finishing mill, Lechler offers the right product for the application. This goes also for plate mills, narrow and wide hot strip mills as well as for bar, wire and structural mills.
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The yield and economy during hot strip rolling depend on developing high capacity components fulfilling further the increasing customers' demands for cost and resource effective production figures. The paper gives an overview of the latest developments for high capacity components and tools of the SMS group for conventional hot strip mills and CSP® plants. The SMS components …
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DESCALE-MASTER. High-pressure water descaler. BENEFITS. Total descaling solutions for the entire rolling mill. Optimized and right-sized pumping stations. Designed to achieve maximum impact with optimal water and power. Maintenance and operator-friendly design. Reduced cost of operation. Totally scale-free products with reduced conversion costs.
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Download Citation | An effective descaling system for hot rolling | By comprehensive application of the hydrodynamics, metallurgy and theory of elasticity, a complete descaling model is developed.
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hot strip mills. There are two kinds of scale relevant in casting plants and rolling mills: Sticky and dry scale. Sticky scale can be removed most effectively by using high pressure systems up to 450 bar. Dry scale can be removed from the surface by application of descaling systems with low distances of the descaling nozzle to the material.
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Drives and automation systems for steelmaking, furnaces, casters, hot and cold rolling mills, profile rolling mills, process lines, as well as complete mini mill electrical systems including turnkey supply of electrical powerdistribution systems. Switches, breakers, relays, switchgear, power distribution substations, static VAR and STATCOM systems.
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Descaling Steel hydromechanically With KAMAT high-pressure pump systems, …
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Roll cooling: General aspects of roll cooling for hot & cold rolling mills Professional report from SEAISI Quarterly Journal (SQJ) 2014, 43, 2; 49-56 – 12/2016 Hubertus Wenig Read now (pdf, 1 ) Roll cooling: Fundamentals of roll cooling and …
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STECKEL MILL — SPECIALIZED SOLUTIONS THROUGH ENGINEERING EXPERIENCE The Steckel Mill occupies a special niche in hot flat rolling, operating at a lower economic volume than tandem hot strip mills but capable of greater widths and especially suitable for …
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