The heating process is much faster than in a batch oven. Continuous annealing and pretreatment lines tenova. In recent years various improvements and new technical solutions have been developed, particularly regarding line concepts, furnace technology, galvanizing. The entry accumulator stores the steel sheet to enable welding and maintaining the continuous process operation.
In 1959, the first continuous annealing line in japan was con structed at hirohata works, and this was followed by the construc tion of many others. Continuous annealing lines by primetals technologies. A new strip temperature control method for the heating section of. Major components of a continuous annealing process line. In a continuous process line of a steel strip disposing a pair of out. Tenova continuous annealing and pretreatment lines cover a strip range from 700 to 2,800 mm wide and 0,2 to 6,0 mm thick. Us3307981a continuous bluing and annealing process. Prolonged annealing induces greater ductility at the expense of strength. It is also the different processes for annealing of cold rolled. Progress of continuous annealing technology for coldrolled. Continuous annealing line strip processing line donghe. Pdf continuous annealing lines are used for heat treatment of coldrolled steel strip, which is necessary to get the right mechanical properties.
Us3307981a us323802a us32380263a us3307981a us 3307981 a us3307981 a us 3307981a us 323802 a us323802 a us 323802a us 32380263 a us32380263 a us 32380263a us 3307981 a us3307981 a us 3307981a authority us united states prior art keywords furnace strip heating zone bluing gas prior art date 19631114 legal status the legal status is an assumption and is not a legal. Although continuoussheetannealing facilities have been used in the north american steel industry for several decades, their use has been largely restricted to certain products for which special metallurgical processing is required. Metal process lines and paint coating lines continuous strip annealing lines apl, bal, cal like the walking beam type reheating furnace, chugai ros strip continuous annealing line has been adopted by a large number of major iron works, copper elongation companies, and aluminum manufacturers in japan and overseas. The implementation of this process line symbolized that baosteel. Continuous annealing and processing line customized annealing and pickling lines for aluminum as individual process lines or combination lines especially for automotive and aerospace strip andritz provides customized and full integrated annealing and processing lines, combining heat treatment and surface treatment process or as individual. In section 2, the rigorous model is explained and section 3 describes the model. Development of strip temperature control for the continuous. These new grades will assist automotive manufacturers in reaching the 2025 corporate average fuel economy cafe standards of 54. However, continuous annealing process line capl technology see figure 3. Annealing and galvanizing lines from the sms group are characterized in particular by the excellent quality of the end product, high efficiency and economy, as well as enormous capacities. The galvanizing line is able to process coils ranging from 900 to 1850 mm 35 to 73 inches in width, and 0.
The continuous annealing line for strip steel processing combines several separate operations, including cleaning, bell annealing, cooling, flattening, and finishing, into a single process. Nowadays, continuous annealing is the only process that allows a very fast cooling rate for the steel after recrystallization. Continuous annealing, by the virtue of the shorter annealing times, produces material with a finer grain size than ba. The maximum production rate for galvanized product is 85. United states steel corporation and kobe steel, ltd. In line resistance annealing machine this machine offered comes supported by advanced system that provides for desired wire elongation. The throughput of a continuous annealing line reaches up to 280 th at a strip speed of about 800 mmin. The whole annealing process including heating, soaking, slow and rapid cooling, overaging and final cooling to ambient air needs only a few minutes. Hot dip process simulator, contiunuous annealing, simulation, modelling.
Protec will now process some of the strongest and most formable grades of steel in north america. Additionally the continuous character of the technique is preferable for the industrial implementation. Particular highlights include the furnace and the coater with its drying kiln, the only ones in this formation in the world. Since then several improvements have been made in the process which allows several types of steels to be processed by this method. Continuous annealing line furnaces for all applications andritz provides annealing furnaces cal with a wide range of heating and cooling technologies to satisfy the process requirements for production of all types of steel grades. Therefore the mechanical properties differ for the same temper number. Galvanizing line with continuous anneal capabilities. Transformations during intercritical annealing and their.
Continuous resistance annealer machine manufacturers. Our solution a complete new cold rolling plant, including a coupled pickling line and tandem cold mill pltcm, a continuous annealing line cal and a continuous galvanizing line cgl, to produce high strength automotive plate and advanced steel grades for household appliances. The figure shows a continuous annealing line, which is composed. The money will be used to install equipment to recover waste heat from the continuous annealing process line capl at the works. Evaluation and characterization of inline annealed. Continuous annealing of cold rolled steel was first introduced by the armco steel corporation in the year 1936 as a process step in the production of hot dip galvanized steel. Cfha is a continuous annealing process in which the plastic parts are placed on the conveyor belt moving through a long tube like oven with forced hot air convection. The horizontal furnace is at the heart of the continuous annealing line 2. With the system suitable to be attached with wire drawing machine that allows for achieving uniform, properly synchronized wires, the wires drawn are of superior quality without any tarnishing possibilities. The process of annealing steel strip continuously allows several indisputable quality advantages when compared to the batch process in particular, uniformity of heating and cooling. Commercial ca lines for coldrolled sheet steels were installed at japanese steel. Rather continuous annealing also encompasses processes where only parts of a metal strip are annealed in a continuous process. The cleaner removes mill oils and iron fines before the steel sheet enters the annealing furnace. Tm uses heat processing to change the crystal structure of coldrolled sheets that have been pickled and rolled after the hotrolling process, thus improving properties such as hardness, strength, and elongation.
Highclass continuous annealing and hotdip galvanizing. The primary use of the hdps has been to determine the effects of process variables on the annealing process and on the continuously annealed strips final properties. These furnaces are used in galvanizing lines cgls and continuous annealing lines cals, and can be radiant tube heated or gasfired with a muffle. Continuous hotdip galvanizing line cgl, continuous. Temperature of steel in the continuous annealing line determines the customer desired mechanical properties, making temperature the most critical process. Andritz selas provides annealing furnaces cal with a wide range of heating and cooling technologies to satisfy the process requirements for production of. The continuous annealing line 2 has an innovative, horizontal layout. Continuous annealing is a constant process without variation. Property prediction of continuous annealed steels core.
Well integration of process control and sequence control. Process annealing, also called intermediate annealing, subcritical annealing, or inprocess annealing, is a heat treatment cycle that restores some of the ductility to a product being coldworked so it can be coldworked further without breaking. Continuous annealing lines can be supplied as turnkey solutions or in individual components. Continuous annealing line cal this line facility changes the crystal structure of steel sheet by heat treatment, and improves properties such as hardness, strength, and elongation. Our continuous annealing processing line incorporates a bestinclass automated inspection system for quality assurance. Capl continuous annealing process line acronymfinder. Continuous annealing line cal continuous galvanizing line cgl annealing and coating line acl color coating line ccl tension leveler solution 2 product quality enhancement from the manufacturing of pig iron and steel to casting, rolling and process lines, we offer a coherent lineup of facilities that enables facility. However, continuous annealing is now more commonly used.
Continuous annealing facilities for uncoated and coated steel strip. Catenary type furnaces involve very high levels of strip tension, depending on the. This strip processing line utilizes a floorstanding continuous annealing furnace to replace the previous bell annealing furnace that can only operate. Ca principle characterized by the process including overaging. Products flat continuous annealing lines highspeed. Annealing process an overview sciencedirect topics. Benefits of improvement in the annealing process heat losses from the furnace were reduced by 80%. Throughout the world at least eight continuous lines have linked pickling and cold rolling and more than 20 have continuous annealing.
It is more demanding requirements in steel mechanical properties. In the continuous annealing line, the feed speed conveyor speed, annealing temperature, co gas density must be controlled depending on the work materials and shapes. Worldofsteel continuous annealing and batch annealing. A serious embrittlement problem can arise after prolonged treatment. Our capl products are supplied to the demanding automotive industry where surface quality is a critical factor for exterior panels. At process speeds between 60 and 140 mmin these plants have capacities ranging from 40,000 to 120,000 tons per year. Part two talks about the atmospheres used for annealing and some of the problems that can occur during the annealing process.
Phase transformation during intercritical annealing ia and the relationship between microstructure and mechanical properties of the intercritical annealed 0. We also offer to individually plan and supply separate handling devices to be subsequently integrated into an existing continuous annealing line. Continuous annealing and processing line how is continuous annealing and processing line abbreviated. Continuous annealing line is defined as process which contains all the steps of cleaning,cooling,heating, refining in single line. With severe forming operations, cracks are liable to occur. Abb continuous annealing lines are characterized by accurate control of the annealing process, and by the production of high quality products. Continuous annealing and processing line listed as capl. Capl offers highquality, homogeneous steel and is one of the widest mills in europe.
Pdf improving the performance of continuous annealing furnaces. D18 discloses such a continuous annealing process wherein recrystallisation is performed at the two opposed side edge portions. An overview of continuousannealing technology for steel. Careful control and monitoring of our process ensures the optimum balance between a good surface. Continuous strip annealing lines apl, bal, cal chugai. The flexibility of these lines allows the use of various chemicals by setting the related process parameters and diversifying the application methods and. It brings all electrical and automation activities under common control platform to provide efficient power and maximize productivity. Strand annealing has been used in the tinplate industry for the annealing of thin strip 4 and other similar research programs were evident in the uk in the 1960s. This type of annealing involves uncoiling, and welding strips together, passing the welded strips continuously through a heating furnace, and then dividing and recoiling the strips. In a continuous process line for manufacturing a soft steel strip for drawing, etc. It integrates the 5 processes of cleaning, cooling, heating, temper rolling, and refining, and carries them out in a single line, thus saving space and lowering costs. Accordingly, the achievable annealing output for a given shop space or line length is clearly increased. Pdf improving the performance of continuous annealing. For the best results, continuous lines must be highly.
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