Get Started
Get Started
FOB Reference Price:
Get Latest Price
Description:A hot mill customer was experiencing problems with its current operations and was looking for improvement in the following areas 187 187Electrical power 187 Productivity 187 Work roll wear 187 Strip quality To help improve their operations, Quaker proposed introducing a rollbite lubrication system including a product from its QUAKER
SourceAccess Heavy Industries Co., Ltd. China(Mainland)
A hot mill customer was experiencing problems with its current operations and was looking for improvement in the following areas 187 187Electrical power 187 Productivity 187 Work roll wear 187 Strip quality To help improve their operations, Quaker proposed introducing a rollbite lubrication system including a product from its QUAKER
A steel strip emerges from the hot roll section of a steel mill at a speed of 20 ms and a temperature of 1200 K. Its length and thickness are L 100 m and delta 0.003 m, respectively, and its density and specific heat are 7900 kgm2 and 640 JkgK, respectively.
controlling strip temperature and applying high pressure water jets. Suitable roll cooling system which washes scales from rolling surface is helpful in minimizing Secondary scale pickup from work rolls to rolled strip. Mechanism of scale removal from hot surface by high pressure water jet is quite complex.
Youll appreciate XRoll 174 hot strip mills from SMS group as allround plants for highquality hot strip. They are designed to produce flat steel from thin strip with a minimum final gauge of 1.2 millimeters to highstrength pipe steels up to 25.4 millimeters thick, including stainless steel grades.
Rolling is done both hot and cold. It is accomplishes in rolling mills. A rolling mill is a complex machine having two or more working rollers, supporting rollers, roll stands, drive motor, reducing gear, flywheel, coupling gear etc. Rollers may be plain or grooved depends upon the shape of rolled product.
Then, as the cold mill gap is adjusted to reduce the crown, the coil also will come out flatif the hot mill got the relationship between crown and flatness right to begin with. If the cold mill rolls or hot mill coils have too much crown, the mills will roll out the center, creating center buckle in the process see Figure 8.
addition to the hot strip mill, the project also included a hot skinpass mill and a shear line for hotrolled strip. The first strip was rolled on August 31, 2002. Right from the start of production, the hot strip mill exceeded the contractually agreed capacity. Until that time, Companhia Sider250rgica de Tubar227o had operated a fully inte
Nov 27, 2015018332If a mill rolls 80 of the calendar year, that is 365 x 24 x 0.80 7008 hours. If the mill rolls 800,000 tons per year, it runs at an average production rate of 114.16 tonshour. If the utilization can be improved by 1 , the available rolling hours is 365 x …
Jun 26, 2015018332How Hot Rolled Steel is Made. Hot rolled steel is the most basic carbon steel product mills produce. It is used to manufacture products in which the surface finish is not critical, including automotive, truck frames, water heaters, agriculture equipment, compressor shells, guard rails and the list goes on. The Heating Process. The process in ...
The stateoftheart rolling mill was developed in such a way that it will meet the future quality requirements for our products. Features of the new rolling mill Maximum rolling force of 8,000 t Work rolls shift for optimized flatness control Drivetrain with a rolling torque of 7,200 kNm Roll changing device for faster roll change
Hotrolled metal is generally free of residual stresses, and its properties are isotropic. ... A 300mmwide strip 25mm thick is fed through a rolling mill with two powered rolls each of radius 250 mm. The work thickness is to be reduced to 22 mm ... 5.12 indicates that force andor power to roll a strip of a given width and work material ...
Question A Steel Strip Emerges From The Hot Roll Section Of A Steel Mill At Speed Of V 20 Ms And A Temperature Of T 1200 K. The Atmospheric Air Pressure And Temperature Are P 1 Atm And Tinfinity 300 K, Respectively. The Steel Strip Length And Thickness Are L 100 M And 8 0.003 M, Respectively, And Its Density And Specific Heat Are P 7900 Kgm3 ...
The Hot Strip Mill is capable of producing 2 Million tons of hot rolled coil annually in a width range of 35 in. 53 in. and a gauge range of 0.059 in. through 0.650 in. Our 4tank Pickle Line can process 1 million tons of Hot Rolled Coils annually between 29 in. and 56 …
The Stereoscopic Width Gauge DigiScan XD4000, designed for installation above the mill roll tables in hot strip and plate mills and cold rolling mills, is stateoftheart technology for measuring the width of strip plate products.For use at the roughing mill or finishing mill exit, the selfemitted optical radiation of the hot strip provides sufficient contrast for width determination.
The sheet can whiphit into the roll surface and mark it. As a result, the following coil produced through the hot strip mill will have these bruises on the head end. If the marks on the work rolls are light, the defect only bruises the next coils surface and eventually wears off the rolls …
A coupled vibration model of hot rolling mill rolls under multiple nonlinear effects is established by considering the nonlinear spring force produced by the hydraulic cylinder, the nonlinear friction between the work rolls, the dynamic variation of rolling force, and the effect of external excitation as well as according to the structural constraints of a fourhigh hot rolling mill in the ...
Jul 01, 1993018332In cold strip mills, gauge change control systems use a mathematical model to select and change the settings as the thickness change point spetial point moves through the mill.ln hot strip finishing mills, however, there are many factors that make gauge control more difficult, and the process used in cold mills is not sufficient.
Severe vibrations, known as chatter, occur often in both hot and cold rolling of steel. A recent chatter outbreak at the second stand of hot strip mill in Hastings, Australia, prompted an ...
If there are some specified ordered material with small crown tolerance, special roll crown lineup and rolling method can be adopted. Crown Reduction Technology in Hot Strip Mill 1. Why the reduction technology of strip crown is important Background 1 Reduced cost by decreased loss andor Increased quality competitiveness ...
The demand for hot rolled strip is growing in multiple ways. To remain competitive, new and existing mills must meet this challenge in the best possible way. The production of hot strip is a key element of steel production. Since close to half of all steel produced is hotrolled to strip, mills require maximum throughput and availability ...
These rolls can either be flat or grooved contoured for the hot rolling of rods or shapes. Under these conditions, the rolls grip the piece of metal and deliver it, reduced in crosssectional area and therefore, increased in length. x The initial hotworking operation for most steel products is done on the primary roughing mill
Thickness measurement is one of the most important measurement tasks in hot rolling mills. With the Oframe and Cframe thicknessCONTROL MTS 820x and MTS 920x series, MicroEpsilon offers high precision measurement systems. Based on laser triangulati
Slabs are the feed material for hot strip mills or plate mills and blooms are rolled to billets in a billet mill or large sections in a structural mill. The output from a strip mill is coiled and, subsequently, used as the feed for a cold rolling mill or used directly by fabricators.
Roll Strip. i Roll i1. Flying Gage Change. The diagram top of next page shows three products continuously rolled from one slab without dethreading strip from the stands. In the case of a hot mill, the mill cannot be slowed down to make changes, so FGC is a highly coordinated control procedure involving the actuator regulators. The first
The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semifinished 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.
The modern hot strip mill is furnished with a tremendous amount of equipment from the reheat furnaces all the way down to the coiling equipment. Fortunately for both our ferrous and nonferrous customers alike Butech Bliss can provide equipment and technical services for nearly every element of the hot strip mill.
Farwest is proud to carry an A57250 flatroll inventory ranging from 316″ to 12″ thick in widths of 48″ to 96″ wide. Standard lengths of 96″, 120″, 144″, and 240″ are inventoried for many stocking sizes, and can also be sourced or processed to any desired length.
The Hot Rolling Process The primary function of the Hot Strip Mill is to reheat semifinished 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.
Hot rolling. This process stretches a slab into a strip. The slab is reheated to approximately 1250176C and rolled in hot conditions. The resultant strip steel is wound into a roll like toilet paper hot coil. Chains for lifting Toughrollers Conveyor chains for conveying semifinished products
Jan 01, 2011018332Table 1 Basic parameters of strip shape control item value F5 entry crown 50206188m Target crown 30 206188m Target flatness 10I Change of roll bending force 207204š950kN Chage of CVC roll location 150mm204š150mm Change of CVC roll corwn 0.34mm 204š0.27mm Strip width change in 1100 1500mm, thickness change in 1.21.4mm.
In this paper, the spalling causes of backup rolls in a roughing mill of a hot strip rolling mill were investigated. The roughing mill withstood extreme service conditions with long service cycles for backup and work rolls, a large variety of the same width rolling campaigns, severe and non‐uniform wear contours of backup and work rolls.
S. S. Voronin, D. U. Usatiy, Work roll bending as a parameter that affects the lateral variation in thickness of the sheet and work roll bending control system of the hot rolling mill, Russian ...
Work rolls in hot strip mills wear due to friction between the roll surface and hot strip. Backup rolls wear as well, but under pressure with elastic deformation, the friction is much less, except for the high work roll roughness in the last stand of a sheet rolling tandem cold mill. The wear is uneven from one end of the barrel to the other.
