Buying the correct type of steel will save you both time and money, and ensure you are offering the best quality products to your customers. Steel can be processed using a variety of machinery and at a variety of temperatures. One of these processes involves sending the steel through a pair of rollers that shapes the metal to a specific thickness. When comparing cold rolled steel to hot rolled steel, the difference begins with the temperature at which the metal is processed. Cold rolling is done when the metal is below its recrystallization temperature, which is the temperature at which the steel grain structure can be altered.
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- Hot-rolled steel coils
- Cold-rolled wide steel tape production volume in Japan 2012-2018
- Main Production Lines
- Cold-rolled narrow steel tape production volume in Japan 2012-2018
- Wide electrical steel tape and sheet production volume in Japan 2012-2018
- Cold rolled coil, strip and sheet
- Rolling (metalworking)
Hot-rolled steel coils
Our present invention relates to a method of producing cold-rolled steel strip of stainless-steel and metal strip, especially of titanium alloys. The invention also relates to a processing line for producing the cold-rolled steel or titanium-alloy strip. Hot-rolled steel strip, hot strip of stainless steel or titanium alloy and the like notoriously have relatively difficult to remove scale layers adherent to them and of varying hardness.
As a result, the strip surface is generally nonhomogeneous. To facilitate working of the steel strip by cold rolling, such steel strip is generally initially annealed. The annealed steel strip can then be subjected to a preliminary descaling operation to facilitate removal of the scale before the strip is pickled. The shot-blast descaling operation results in a roughening and homogenization of the strip surface. The annealing, shot-blast descaling and pickling are carried out in a common processing line.
As a consequence, the thus treated steel strip is wound up into a coil and supplied to a separate processing line containing the cold-rolling frames or mills. The cold-rolling operation results in a reduction of the strip thickness to the desired final thickness and amounts to a size calibration of the strip concurrently with a smoothing of the strip surfaces and a compacting of the strip.
The strength of the steel strip increases sharply with the cold-rolling operation so that its deformability is correspondingly reduced. As a result, cold-rolled steel strip must be subjected to a further annealing operation in which the strength of the steel strip is lowered by a recrystallization phenomenon and the deformability of the strip is increased. If the annealing is not carried out under a protective gas blank annealing , annealing scale develops on the strip surface and must be again removed by a pickling operation.
The annealing and pickling are again carried out in another treatment line, i. The fabrication process just described is relatively time-consuming, energy-intensive and expensive because of the personnel costs. In another known process, the hot strip is cold-rolled without pretreatment and after the cold-rolling is subjected to annealing and pickling. In this case, the increased surface roughness must be acceptable since without it, the difficult to remove scale would remain to be rolled into the strip surface if the pretreated hot strip is to be subjected to cold-rolling in a continuous processing line compare U.
It is, therefore, the principal object of the present invention to provide a method of producing a cold-rolled stainless-steel or titanium-alloy strip which provides a saving as to time, energy and personnel by comparison with other methods, produces a strip with an exceptionally smooth surface and which, depending upon the composition of the strip, can have a bright or matte finish, and which otherwise is free from drawbacks of earlier fabrication techniques.
Another object of the invention is to provide an improved process line, i. It is another object of the invention to provide a highly economical method of producing cold-rolled stainless-steel or titanium-alloy strip which is more economical than earlier systems and nevertheless produces an improved product.
Hot strip as this term is used in this application is intended to describe hot-rolled steel or metal strip which has been cooled to room temperature. The hot strip according to the invention can be brush-polished subsequent to the shot-blast descaler and optionally subjected again to shot-blast descaling.
It is also possible to brush-polish the hot strip prior to the shot-blast descaling. During the shot-blast descaling, a homogeneous descaled strip surface is obtained which, as a consequence of the brush polishing, is found to be especially deep cleaned, an operation that does not exclude the formation of longitudinally-extending grooves, furrows or channels in the surface.
As a consequence, any inhomogeneities resulting from the presence of scale on the hot-rolled strip surfaces are eliminated prior to cold-rolling. The steel strip has a cold-rolled lattice structure as a result and the strength thereof is greatly increased. The strip surfaces are compacted and smooth. After cold-rolling to the final strip thickness, the steel strip is annealed and the strength and shaping properties can be established in accordance with the usual industrial and marketing standards.
While annealing does result in the formation of some annealing scale on the strip surfaces, the annealing scale can be removed by pickling the annealed strip utilizing conventional pickling operations. After pickling the strip is practically free from scale and has the desired surface characteristics. It is a finished rolled steel or metal strip with the desired properties of the material selected from the strip and a high quality surface structure.
The cold-rolled strip of the invention is highly suitable when fabricated in stainless-steel or as metal strip from titanium alloys. The energy and personnel costs of the method of the invention are greatly reduced by comparison with earlier techniques. The scrap losses are greatly reduced and hence the productivity is high. The time for producing the finished steel strip is significantly reduced.
These advantages are optimal when, in accordance with the invention, the steps described are carried out in a single processing line and continuously with the steps being sequential. The brush-polishing allows possible surface peaks to be removed. Such surface peaks are usually composed of ferritic steels which can break off in the cold-rolling mill to form particles which deposit on the rolls and reduce the lives thereof. In the brush-polishing, the use of washing brushes is conceivable.
After pickling, the steel strip is scale-free and has an unusually smooth surface, and depending upon the properties of the material, can be bright or matte in finish. By the use of dressing rollers or an after-rolling mill following pickling, the strip surfaces can be further compacted and smoothed.
These dressing rolls or after-rolling rolls are intended to modify only the surface finish for the cold-rolled strip which is already at its final thickness. With a subsequent stretch-bend leveling or tension-leveling tensioning , the planarity of the strip can be improved in the same processing line. For the purposes of the invention, it is important that all of the operations which have been described thus far be carried out in a single continuous line. According to the invention, therefore, a method of producing cold-rolled stainless-steel or titanium-alloy strip is carried in a single continuous line and comprises:.
Advantageously, between the annealing oven and the pickling bath, a cooling device is provided for air cooling and water cooling or quenching of the strip from the annealing oven. Downstream of the pickling unit, a dressing roll frame or an after-rolling frame can be provided for the purposes described.
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:. Turning to FIG. An optional stretch-bend leveler 3 can be provided at an upstream end of this line and can be constructed as described at page of The Making, Shaping and Treating of Steel, United States Steel Co.
The stretch-bend leveler 3 functions in part as a scale-breaker, the strip leaving the stretch-bend leveler is supplied to a descaling section represented at 21 and which can include a shot-blast descaler 4 which can be followed by a polishing-brush unit 5.
The shot-blast descaler may have the construction described at pages of The Making, Shaping and Treating of Steel, op. Immediately following the polishing-brush unit 5, cold-rolling is effected on one or more cold-rolling mills 6 see pages ff.
The annealing stage 7 is followed by a additional cooling which can employ air coolers and water quenchers and may, if desired, be followed by a stretch-bend leveler 8a, a polishing-brush unit 8b and if desired, another stretch-bend leveler 8c upstream of a shot-blast descaler 9 which can be of the construction previously described. The single processing line continues with another polishing-brush unit 10 or a washing-brush unit.
The strip then enters the pickling unit 11 which can be of the type described at pages ff of The Making, Shaping and Treating of Steel. Following the pickling baths, the strip, while continuously displaced along the line, can pass through a dressing-roll frame 12 in which the mill rolls improve the surface character of the strip without further reducing its thickness.
The strip may be then passed through a stretch-bend leveler or a tension leveler 13, the principles of a tension leveler being represented at page of The Making, Shaping and Treating of Steel. The strip, at the end of this line, is collected in a coil on a coil-winder In particular, the unwinding unit 30, receiving a coil from the coil car can pay out the hot-rolled strip 32 through an entry deflector 34 having a pinch-roll unit 35 which is provided upstream of a stretch-bend leveler 36 from which the strip passes a shear 37 at which defective strip can be removed as scrap into the scrap car Passing between another pair of pinch rollers 39, the strip can feed through a welder 40 which welds successive pieces of the strip together into a continuous band and welds the trailing end of a strip from a preceding coil onto the leading edge of the strip of a succeeding coil.
From the welder via pinch rollers 41, the strip passes through a conventional notcher 42 to a steering roll unit The strip 32, which is centered between centering units 45, 46 and 47, is then fed via bridles 50 and 51 FIG.
Downstream of the stretch-bend leveler 52 are two other bridles 53 and 54 from which the strip 32 passes through a side trimmer 55 associated with a scrap chopper 56 for cutting up the side trim scrap. Via rolls 57 and 58, the strip 32 is fed to a lower level of the line at which a looper car 59 is provided, the strip returning from the looper car in a pass 32' over a steering roll 60 to form a lower pass 32" which, at the looper car passes at 32'" to the double-steering roll 61 and 62 to return at 32 to the upper level FIG.
In FIG. Returning to FIG. The shot-peened strip at 32a is then passed over a steering roller 71 through a brush polisher 72 and then via a steering bridle 73 to a tension-measuring unit 74 and an X-ray gauge 75, both known in the art. The strip passes through a two-roll wiper 76 into the first of two cold-rolling mills 77 and 78, each of which is preceded and followed by such wipers as are represented at 79, 80 and Other tension-measuring devices are provided at 82 and 83 while additional X-ray gauges are provided at 84 and The cold-rolled strip 32b FIG.
After passing another tension-measuring unit 96, the strip 32c enters the annealing oven represented generally at 97 and comprising a convection zone 98, a radiation zone 99 and three heating zones of which only the first zone and the last heating zone can be seen. The gases which emerge from the oven are carried away by the ducts The annealed strip emerging at 32d FIGS. Also visible in FIG. The dried and cooled annealed strip 32e passes over the double-steering rolls and to a bridle which is followed immediately by a shot-blast chamber in which the strip is again subjected to shot-blast descaling before passing at 32f over a tension-measuring roll to a brush polisher From the brush polisher, the strip 32g passes into the pickling unit which can include a plurality of pickling tanks , and only the first, second and last of which have been illustrated.
Between these pickling tanks additional brush polishers and intermediate rinsing stages can be provided and it is preferred to have at least four pickling tanks with brush polishers between the second and third pickling tanks and an intermediate rinse between the third and fourth pickling tank. The pickled strip 32h FIGS. The completely descaled strip is fed at 32i through the steering bridle to levelers and and then via a bridle to a roller guiding the strip 32i onto an exit-looper car which can be drawn to the right by the exit-looper car drive connected via the cable with the exit-looper car FIG.
The units and can function as dressing rolls for treating the surfaces of the strip without modifying the thickness. The strip 32i passes from the exit-loop car at 32i over the steering roll back to the car and then from the car with the pass 32i" to the bridle The strip then passes through a notcher , a side trimmer with its scrap chopper and an inspection station where the strip 32j is inspected.
The strip passes over another bridle between pinch rolls to an exit shear severing the continuous strip between the wound-up coils and then through an exit deflector and pinch-roll unit to the coil winder The apparatus shown in greater detail in FIGS. All rights reserved. A SumoBrain Solutions Company. Login Sign up. Search Expert Search Quick Search. Method of and process for cold-rolling of stainless-steel and titanium-alloy strip. United States Patent The cold-rolled strip, at its final thickness, is annealed and then pickled, all in a single continuous line.
Click for automatic bibliography generation. KARL F. We claim: 1. The method defined in claim 1 wherein in step a the hot-rolled stainless-steel or titanium-alloy strip is shot blasted and then brush polished for descaling in said single continuous line to produce said descaled hot-rolled stainless-steel or titanium-alloy strip. The method defined in claim 2 wherein the hot-rolled stainless-steel or titanium-alloy strip is shot blasted after the brush polishing for descaling in step a.
The method defined in claim 1 wherein for descaling in step a , the hot-rolled stainless-steel or titanium-alloy strip is brush polished and then shot blasted. The method defined in claim 1 wherein prior to descaling in step a , the hot-rolled stainless-steel or titanium-alloy strip is subjected to stretch-bend leveling.
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Cold-rolled wide steel tape production volume in Japan 2012-2018
Antimony by John A Rathjen. Asbestos by Robert A Clifton. Barite by David E Morse. Bromine by Phyllis A Lyday. Cement by James T Dikeou. Cesium by Robert J Bascle.
Main Production Lines
Our present invention relates to a method of producing cold-rolled steel strip of stainless-steel and metal strip, especially of titanium alloys. The invention also relates to a processing line for producing the cold-rolled steel or titanium-alloy strip. Hot-rolled steel strip, hot strip of stainless steel or titanium alloy and the like notoriously have relatively difficult to remove scale layers adherent to them and of varying hardness. As a result, the strip surface is generally nonhomogeneous. To facilitate working of the steel strip by cold rolling, such steel strip is generally initially annealed. The annealed steel strip can then be subjected to a preliminary descaling operation to facilitate removal of the scale before the strip is pickled. The shot-blast descaling operation results in a roughening and homogenization of the strip surface.SEE VIDEO BY TOPIC: SMS group - Cold rolling - Pickling Line Tandem Cold Mill of JSW Steel Ltd
Ferrous materials have made a major contribution to the development of modern technology; they span a tremendous range of properties and applications. Reflecting the industrial practices, the information provided here offers easy access to reliable processes involved in the manufacturing of Steel products like Steel Bars, Wires, Tubes, Pipes, Sheets etc that proves to be the backbone of construction and automobile industries booming worldwide. The work closes the gap in the treatment of steel and cast iron. Each chapter takes into account the gradual transitions between the two types of ferrous materials. It demonstrates that ferrous metal and steel are versatile and customizable materials which will continue to play a key role in the future and also covers the operations performed on ferrous metals for converting them into a commodity. The book provides a full characterization of steel, including structure, chemical composition, classifications, physical properties, production practices of different steel products, processing of ferrous metals and so on. It will prove to be a layman s guide for the entrepreneurs who are willing to invest in the ventures related to Iron and Steel Industries, as it contains information related to processing of ferrous metals and production practices followed in Steel products manufacturing units. The text discusses the importance and objectives of processes and material used for the production of disposable products. Many examples have been provided to illustrate the concepts discussed.
Cold-rolled narrow steel tape production volume in Japan 2012-2018
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Wide electrical steel tape and sheet production volume in Japan 2012-2018
Cold rolled coil, strip and sheet
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In metalworking , rolling is a metal forming process in which metal stock is passed through one or more pairs of rolls to reduce the thickness and to make the thickness uniform. The concept is similar to the rolling of dough. Rolling is classified according to the temperature of the metal rolled. If the temperature of the metal is above its recrystallization temperature, then the process is known as hot rolling.
The present invention relates to a method and an apparatus for manufacturing a hot rolled steel strip. More particularly, the present invention relates to a method for manufacturing a hot rolled steel strip, the method capable of effectively removing iron oxide films from surfaces of a hot high temperature coil and having an improved total process rate, and an apparatus for carrying out the method.
This is a byproduct from the acid regeneration plant, where in the spent acid from the pickling line is processed to recover and reuse the acid. Iron oxide is used in the soft-magnet, paint, and cement manufacturing industries. The typical specifications of this product are as follows: This composition may vary depending on the processing conditions.
Mineral Facts and Problems. Antimony by John A Rathjen. Asbestos by Robert A Clifton. Bromine by Phyllis A Lyday.