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Introduction A hot strip mill rolls cast steel slabs into thin sheets. A typical hot strip mill facility consists of, in written order, the fol- lowing units: reheat furnace, roughing mill, transfer table, coilbox, crop shear, finishing mill, runout table and coiler. A layout of the plant is given in Fig. 1.
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Mill pacing, a technique to accurately control the rolling time of a rolled material and that of the following one, was improved to make the endless hot strip rolling practical by minimizing the ...
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Currently, China has about 350 million mt/year of HRC production capacity, according to some market sources. That means if the new mills are commissioned on a timely basis, China's HRC production capacity will increase by around 11.8% in 2022 and 6.8% in 2023. The new hot strip mills width ranges from 1,450 mm to 2,250 mm.
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Sendzimir mill backup roll assemblies ・Adopted roller bearings for 1,680m/min cold-strip mill backup rolls ・Developed sealed cylindrical roller bearings for Sendzimir mills ・First delivery of drive shafts for cold-strip mills ・Received award from the Japan Society of Mechanical Engineers for hot-strip mill drive shaft
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A small change in oil viscosity does ... The classic oils for the finishing hot strip *CRM - Ghent, Technologiepark 903, 9052 Zwijnaarde, Belgium **ArcelorMittal Dunkirk, Grande Synthe 2508, 59381 Dunkerque Cedex, France ... work roll of stand F2 in the hot strip mill at ArcelorMittal Dunkerque (Fig 4). Twelve noz-zles were used to lubricate ...
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The range of HSMs for the rolling of hot rolled coils has undergone significant changes in the last few decades with minimum thickness of the hot rolled strips has been decreased from 1.8 mm to 2 mm to 0.8 mm to 1.2 mm. The strips of such thickness were earlier produced only in the cold rolling mills.
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Based on development work and laboratory studies on oxidation behaviour, these improvements benefit both to Hi-Cr and HSS rolls. The full implementation of HSS in stands F1 to F4 during year 2000 will allow to increase the mill availability by eliminating the intermediate roll change and reduce the work load in the roll shop.
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Endless hot rolling, which was first employed in com-mercial production in 1996 at Chiba No. 3 continuous hot strip mill, is a production process for joining intermittently supplied rough bars and carrying out finish rolling in an endless manner. Endless rolling can prevent bar bending in the width direction at the head end and pinching at the tail
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Transfer bar cooling system installed at the hot strip mill ... is all to more precise if the change is small. Figure 6. Allowable roll gap difference for two widths as function of thickness to ...
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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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The effect of work roll shifting on roll thermal crown is mainly concentrated in regions around twice of roll shifting stroke, and the change range of roll thermal crown is ± 30 μm or so in the same roll body location. ... Thermal Crown Model and Shifting Effect Analysis of Work Roll in Hot Strip Mills. J. Iron Steel Res. Int. 22, 777–784 ...
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hot strip mill, on certain types of schedules, it was observed that the work roll wear model noticeably underpredicted the wear depth. The difference between the actual and …
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Increase mill speed; Quick work roll change systems; Redesigned entry and exit guides; Hydraulic loopers (for hot finishing mills) New material handling schemes; ... The modern hot strip mill is furnished with a tremendous amount of equipment from the reheat furnaces all the way down to the coil processing equipment. Fortunately for both our ...
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rolls. The mill modulus will change as the rolls wear, after each change of the work rolls, backup rolls and less commonly, after changes to the mill housing. The strip exit …
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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. ... and producing the geometric roll gap distribution change effect in the width direction. This is shown in Fig 6. Out of various ...
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Plate Mills. To meet the needs of the aluminum market, our hot mill solutions feature a range of common technological enhancements to increase performance, operability, safety, and surface quality. These include: SmartCrown roll contour, which guarantees enhanced profile and flatness control. Heavy work roll bending for improved profile control.
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Hot Strip Mills Chao-Chao Chen1 Jian Shao1 An-Rui He1 Nan-Feng Zhang2 ... (CSP) hot strip mills. Based on the roll contour, control model, and rolling process, a comprehensive shape control technology is proposed and applied to CSP hot strip mill of Lianyuan steel, which includes optimization
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2 Shape control conditions of strips in CSP hot strip mills. The CSP technology was commissioned at Liansteel at the end of 2003, and its main product structure focuses on the thin strip. The proportions of the hot rolled strips with a thicknesses of less than 2.0 mm and 1.5 mm are over 40% and 15%, respectively.
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Two new types of rolls, VCR (varying contact back-up roll) and ASR (asymmetry self-compensating work roll), have been developed and used on the 1700 mm hot strip mill at Wuhan Iron and Steel Corp.
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The correspondingly change of the roll gap crown. As shown main subjects of VCR are the varying contact backup in Fig.5, the two-dimensional(2D) finite element analysis rolls with special roll contours, corresponding work roll model with varying thickness of the 4-high hot finishing contours, technological parameters setup and control mill ...
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Strip crown were reduced in low carbon steel with 3.8mm*929mm by 12μ, 107μ and 110μ by taper roll and 124μ and 118μ by ordinary sine curve roll respectively. The 2nd experiment; Strip crown was reduced and flatness …
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Abstract. This paper describes how an optimization of the rolling conditions (roll lubrication, strip chilling) and the use of new roll qualities on the 2050 mm hot strip …
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tons of hot rolled steel per millimetre of machined roll diameter (t/mm), whereas typical flat rolls have "lives" about 5 . 10 3 -20 . 10 3 t/mm [1,7,8]. Such a variet y of roll wear criteria ...
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open archive. Abstract. Work roll thermal expansion (crown) plays an important role in controlling strip profile and flatness of the strips. This can be done with a …
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V. Goryany, O. Myronova Modern materials for cast rolls of hot strip mills 300 ZASTITA MATERIJALA 63 (2022) broj 3 ... on the roll surface is a reason to change rolls (Fig. 2).
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2.1 Dynamic Model. The rolling mill drive system mainly consists of the motor, reducer, main shaft, speed divider, arc gear shaft, work roll and bearings at corresponding parts [].The torsional vibration is often closely related to the dynamic energy transformation process of the rolling interface, which causes the relative speed between …
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To eliminate the problem of roll shifting position duplication due to available roll shifting strategy, the optimized work roll shifting strategy is proposed in the hot …
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3.1 Design principle of variable contact back-up roll. Yang et al. [] proposed a variable contact back-up roll (VCR) shape.The VCR curve is a high-order curve (usually a 6-order curve) with designed continuous curvature change. The VCR technology used in finishing mill group has the following advantages: it can automatically adapt to different …
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The new products developed by using No. 3 hot strip mill are as follows: (1) Ultra high r-value cold-rolled sheet steel: Newly developed continuous and warm rolling technique combined with ...
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Seven 4-high mills equipped with individual roll bending and roll shifting actuators are generally included in the hot rolling line. CVC work roll is used in the upstream mill stands (first four stands), and special parabolic work roll that can decrease the edge drop is used in the downstream mill stands (last three stands).
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