Hot Strip Mills. Modern rolling mills that ensure product quality and mill productivity. 25/116. The Hot Strip Mill represents the most productive solution for flat rolled products. It provides the highest level of …
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The tension value of Ut of hot roll strip mill. Strip width (mm) h ≤ 2.5 2.5 < h ≤ 3.0 3.0 < h ≤ 5.0 5.0 < h Unit tension (MPa) 16.02 14.56 12.41 11.17 where σ is yield stress. Yield torque which strip bending deformation needed occupies a …
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A computer model is developed for work roll cooling system in hot strip mill. Using the finite difference method under unsteady conditions the energy equations for the work roll with variable boundary conditions are solved. The model has been verified with the experimental data from Mobarakeh Steel Complex (MSC). We consider two cases for …
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work rolls in stand F0 was simulated for one week of service time in the mill. The work rolls had an initial ground crown of +0.005 inch. Fig. 7 provides an illus-tration of the effect of the roll wear for the two bar widths, i.e., 40 inches and 70 inches. Simulation results confirmed the significant impact of roll wear on the transfer bar crown.
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Advanced work roll cooling and thermal crown control in the new algoma steel DSPC finishing mill. E. Crisà E. Donini M. Rotti. Engineering, Materials Science. 1999. Algoma is using a new roll thermal crown control system to improve strip crown and flatness control for a wide range of product thicknesses and grades. 2.
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Low-, medium- and high-carbon steels, high-strength low alloy steels, X grade pipe steels, silicon steels and stainless steels were rolled. The early hot strip mills were first …
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The objective in a hot strip mill is to roll thick slabs into thin strips. Slabs are the semi-finished steel product which are produced in a continuous casting machine. Reheating furnaces are used to heat slabs. When they reach a temperature of around 1,240 deg C, they are lifted out of the furnace on to the roller table. Roller tables are used ...
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In this paper, we propose a machine learning based framework to establish a model that accurately predicts roll forces at each mill stands of the hot strip rolling mill. In contrast to the traditional models, the proposed expert system considers an individual model for each rolling stand and employs rolling history when predicting roll forces ...
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Standi+1 2. ROLL SPEED SET-UP AND CONTROL A roll speed is calculated from target strip thicknesses, the target strip speed at the exit of last stand, and a forward slip computed by the set-up model to consider the slippage between a strip and a roll as follows. Vri = Vsl * htl (1 + f i ) * ht i (1) Where, Vr = roll speed, Vs = strip speed, …
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To ensure product uniformity, hot rolling mills need reliable, repeatable process control data to identify operating issues; off-gauge and off-tolerance product results in the downgrading or even scrapping of coils. However, when hot material exits the rolling mill, the vertical position and orientation of the strip is not sufficiently defined ...
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Technically, the essence of profile and flatness control lies in the control of lateral roll gap in hot strip rolling process, ... promising to apply in hot strip mills to enhance the overall performance of mills in profile control. The industrial application of this new contour technology shows the percentage, which strip head crown is within ...
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Rolls are key components in hot strip mill. Roll wear and fatigue are inevitable phenomena during hot-rolling process. Finite element (FE) analysis shows that roll profiles, especially work roll wear profile, have significant effects on contact stress distributions. Long-term effect of huge contact stress peaks in roll sides is the main …
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With a view to the wide size range of the hot rolled strip thicknesses from 1.5 mm to 20 mm, width from 750 mm to 2200 mm as well as the conditions and costs for maintenance of the coiler station, a three roll or a four roll coiler offers a large number of practical benefits. Technical.
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The first major operation in the hot rolling mill is the reheating of s lab or billet. There is a lot to be. said about reheating furnaces, both about their technology and their exploitation. The ...
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Too much heat can weaken the metal and cause grain boundary cracking. Hot rolling in the strip mill welds the pores left by the casting process, creating a denser, stronger metal. It also transforms brittle metal into a more ductile form that allows for a greater internal metal flow. As hot rolling affects the surface, an inspection monitoring ...
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HSS rolls, often installed in the earlier stands of hot strip mills, provide improved wear resistance along with a better surface roughing resistance. However, HSS are rolls more sensitive during operation and require a higher grade of attention with regard to roll cooling than High-Cr rolls. HSS rolls need an adequate mill operating environment
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Hot rolling. This process stretches a slab into a strip. The slab is reheated to approximately 1250°C and rolled in hot conditions. The resultant strip steel is wound into a roll like toilet paper (hot coil). Chains for lifting; …
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Abstract This paper reviews the possibilities of numerical modeling for assessing the stress of backup rolls in a 2000 continuous wide-strip hot mill. Using the finite element method implemented in the SIMULIA Abaqus system, the maximum stresses in the contact area between rolls are found to occur at the beginning of chamfers. The …
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In hot rolling mills, premature failure of rolls is a major concern as it adversely affects the mill operation as well as production. Analysis of failed roll materials and actual rolling conditions in service are therefore necessary to understand the roll failure mechanism and thereby improve the service life of rolls. The hot strip mill referred here …
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Stelco's Lake Erie hot strip mill utilizes three slab reheating furnaces, a vertical edger & reversing rougher, a Coilbox, a six-stand finishing train, an advanced run-out table ... oxide which is inherent during the hot-rolling process. Size Availability Thickness** 0.075" - 0.625" 1.9mm - 15.9mm Max Width** 72.5"
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Your Capacity and Production Requirements. The first step in selecting a rolling mill is assessing your production requirements. Determine the desired capacity and volume of steel you need to process. …
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The right solution for high-quality flat rolled strip. Running a hot strip production facility these days places high demands on the future viability of the equipment. Our hot rolling mills are capable of producing flat steel from thin gauges of 1.2 mm to high-strength steels up to 25.4 mm thick, including stainless steel.
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Work rolls in the hot strip mill withstand extreme service conditions, especially when electrical steels are rolled, resulting in severe roll wear and fatigue. High-speed steel (HSS) work rolls and rolling lubrication are applied to the mill to improve roll wear and fatigue. Tests show that HSS work rolls manifest good performance in wear, …
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A 1400 mm wide × 4 mm thick strip is hot rolled down to 3 mm thickness (this corresponds to the last stand of a Hot Strip Mill). The rolls (600 mm diameter, 1600 mm barrel length) are assumed rigid in the simulation; to mimic roll bending effects on stress patterns and profile defects, they have been given a negative (concave) parabolic crown ...
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Rolls form one of the most important component categories in the last stages of the entire process route. It is very important to have the right quality of rolls for desirable rolling to produce flat products [1]. The thin strip mill produces strips of thickness in the range of 1.0–12.7 mm. The annual production of the mill is approximately 1 ...
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Strip steering, especially at the end of rolling and tail-out rips, is a main source of unscheduled downtimes in a hot strip mill (HSM). The main focus of this paper is the …
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Sault Ste. Marie, ON Dominion : Engineering . Works 1982 (3) WB (1) 2-hi : reversing with edger, (1) 4-hi plate reversing mill with edger; HAGC (6) Pneumatic
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Jet Cui. Fei Wang. PDF | The state-of-the-art of both technology and operational practice of a hot rolling mill are discussed. The focus is first on the control of entry... | Find, read and...
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On the 1+4 hot rolling line strips of all kinds of aluminum and aluminum alloys with best surface quality, excellent thickness profile and flatness tolerances and perfect final rolling temperature. Layout of semi-continuous aluminum mill. Let's get in touch! Use our contact form for questions, inquiries or personal contact.
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And then, the effects of strip) width, rolling rhythm and work roll shifting on roll thermal crown were analyzed. It is found that work roll shifting can disperse the thermal expansion of the roll body especially the edge to make roll thermal contour uniform. The effect of work roll shifting on roll thermal crown is mainly concentrated in ...
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V. Goryany, O. Myronova Modern materials for cast rolls of hot strip mills ZASTITA MATERIJALA 63 (2022) broj 3 301 forces and a low rolling speed, which leads to a
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Zhang, D., Zhou, F.: TDC-based wrapping roll automatic jump control system for a 1500mm hot strip mill coiler. Journal of University of Science and Technology Beijin. (6) (2007) Google Scholar Li, Y-l., Liu, X.: Design and Research on AJC Hydraulic Servo Controlling System of Hot-rolling Coiler.
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The thickness range varies from 1.2 mm to 25.4 mm and the width range is from 700 mm to 2100 mm. The process layout of some of the mills allows production of more than 5 …
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Hot strip rolling is a rolling technology of hot rolling billets to obtain strip or thin (medium) plate, also known as hot strip rolling. There are two main ways of hot …
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The Hot Strip Mill is where CSI's rolling operations begin, as steel slab is reheated and rolled to hot rolled coil. With an annual capacity of more than two million tons, the rolling mill is more than a half-mile long and …
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60 in. Hot Strip Mill with Coil Box Making, Shaping and Treating of Steel: 101 HEATING: Slab is heated to temperature required for rolling (2400ºF) via combustion of natural gas. …
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Normally, the rolling program of a hot-strip mill is influenced by roll wear. Since the heaviest roll wear takes place at the colder edges of the strip, it is common to roll wide strips first and narrow strips later. ... Many highly mechanized hot-strip mills have a capacity of three million to five million tons per year, and as much as 60 ...
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