AU2011275945A1 - Method and production line for producing a cold rolled flat steel product from a rustproof steel - Google Patents
Method and production line for producing a cold rolled flat steel product from a rustproof steel Download PDFInfo
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- AU2011275945A1 AU2011275945A1 AU2011275945A AU2011275945A AU2011275945A1 AU 2011275945 A1 AU2011275945 A1 AU 2011275945A1 AU 2011275945 A AU2011275945 A AU 2011275945A AU 2011275945 A AU2011275945 A AU 2011275945A AU 2011275945 A1 AU2011275945 A1 AU 2011275945A1
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- cold
- flat product
- rolled
- steel flat
- rolled steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000137 annealing Methods 0.000 claims abstract description 45
- 238000005097 cold rolling Methods 0.000 claims abstract description 26
- 239000010960 cold rolled steel Substances 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 13
- 238000005422 blasting Methods 0.000 claims description 11
- 230000003746 surface roughness Effects 0.000 claims description 6
- 230000001680 brushing effect Effects 0.000 claims description 5
- 238000007669 thermal treatment Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 description 42
- 229910001220 stainless steel Inorganic materials 0.000 description 42
- 239000000047 product Substances 0.000 description 39
- 238000005554 pickling Methods 0.000 description 12
- 238000005096 rolling process Methods 0.000 description 8
- 238000005452 bending Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000000161 steel melt Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a method and to a correspondingly designed production line (1) for producing a cold rolled flat steel product (E) from a scale coated hot strip (W) made of a rustproof steel. In the course of the method according to the invention, the hot strip (W) coated with scale is cold rolled to form the flat steel product, the cold rolled flat steel product (E) is annealed, and the annealed flat steel product (E) is descaled. According to the invention, the cold rolled flat steel product (E) obtained after cold rolling the hot strip (W) is subjected to a descaling treatment in the hard rolled state prior to annealing, wherein the scale present on the cold rolled flat steel product (E) is mechanically removed. In this manner, methods and production lines can be implemented, by means of which it is possible to produce cold rolled flat steel products from rustproof steel having improved surface finish in a cost-effective manner.
Description
SI/cs 101062WO 30 June 2011 Method and production line for producing a cold-rolled steel flat product from a non-corroding steel The invention relates to a method for producing a cold rolled steel flat product from a hot strip with scale adhering to it and consisting of a non-corroding steel, in which the hot strip with scale adhering to it is cold rolled into the steel flat product, in which the cold rolled steel flat product is annealed, and in which the cold-rolled steel flat product is descaled. In addition, the invention relates to a production line for producing a cold-rolled steel flat product consisting of a non-corroding steel, wherein the production line comprises at least one cold-rolling stand, at least one annealing furnace and at least one unit for mechanically removing scale adhering to the cold-rolled steel flat product. Here, "steel flat products" are understood as steel strips or sheets produced from a non-corroding steel or a so called "stainless steel". In the course of producing cold-rolled stainless steel flat products an appropriately formed steel melt is cast into a semi-finished product, such as slabs, thin slabs or cast strip, from which a hot strip is hot rolled and wound up into a coil. The hot strip obtained, which if required is SI/cs 101062WO 30 June 2011 - 2 subjected to additional heat treatment, is subsequently with the scale adhering to it cold rolled into a cold strip in a single or in multiple stages. In the course of cold rolling, the rolled steel strip hardens, as a result of which the cold strip obtained after cold rolling can at best only be formed to a much reduced extent. In order to eliminate this so-called "cold-work hardening", the cold strip is usually subjected to heat treatment, in which it is annealed at sufficiently high annealing temperatures. The fine scale particles adhering firmly to the surface which are still present afterwards can be eliminated in a pickling unit, through which the cold strip is directed after the scale has been mechanically removed. A typical example for the type of production line mentioned above is known from DE 691 26 699 T2 (EP 0 509 177 B1). To increase the effectiveness with which the scale adhering to the annealed strip is removed, according to this prior art the pickling unit can be combined with a mechanically effective descaling unit. In practice, a scale breaker is used for this purpose, in which coarser pieces of the scale adhering to the annealed strip are removed. In addition, a shot blasting unit or a brushing unit is usually provided which mechanically separates larger scale particles still remaining from the cold strip when it exits the scale breaker. To complete manufacture, the cold strip is, if required, additionally skin-pass rolled after leaving the pickling unit, in order to improve its yield strength and dimensional stability. SI/cs 101062WO 30 June 2011 -3 Practical experience has shown that although large quantities of cold-rolled steel flat products can be produced from non-corroding steel cost-effectively with the above mentioned type of production line, the surface quality of steel flat products produced using such production lines in many cases does not meet present-day requirements. Against this background, the object forming the basis of the invention was to specify a method and a production line which is particularly suitable for carrying out such a method, by means of which cold-rolled steel flat products could be produced cost-effectively from non-corroding steel with an improved surface finish. With regard to the method, this object is achieved according to the invention by the production steps specified in Claim 1 being passed through when producing cold-rolled steel flat products from non-corroding steel. With regard to the production line, the above mentioned object is achieved according to the invention by such a line containing the features specified in Claim 13. Advantageous embodiments of the invention are specified in the dependent claims and are explained, as with the general concept of the invention, in more detail below. As with the prior art explained at the outset, the method for producing a cold-rolled steel flat product according to the invention proceeds on the assumption that hot strip with scale adhering to it and consisting of non-corroding steel, so-called "black sheet", is cold rolled without SI/cs 101062WO 30 June 2011 prior descaling. The method according to the invention additionally comprises an annealing step to soften the cold-rolled material. Descaling also takes place according to the invention to free the cold-rolled steel flat product from the scale adhering to it. According to the invention, the cold-rolled steel flat product obtained after cold rolling the hot strip is now subjected to descaling treatment in the hard-rolled state before annealing, in which the scale present on the cold rolled steel flat product is mechanically removed. Therefore, with the method according to the invention, the hard-rolled cold strip is mechanically descaled before it is annealed. Here, the invention, on the one hand, takes advantage of the fact that a part of the scale is already broken during cold rolling and can accordingly be easily separated from the cold-rolled steel flat product. The advantage of this procedure is that the hard-rolled cold strip is comparably insensitive to the forces acting on its free surfaces during mechanical descaling. Thus, the surface deformations which occur when the hard-rolled material is mechanically descaled are far less than those which arise during conventional descaling of comparably soft steel strips, softened again after annealing. The steel flat product, which is freed to the greatest possible extent from coarser scale according to the invention, then passes through a conventional annealing unit, in which annealing is carried out in a conventional manner, in order to eliminate hardening which occurs in the course of cold rolling and is possibly further increased during mechanical descaling. SI/cs 101062WO 30 June 2011 - 5 On the other hand, unlike when steel flat products susceptible to corrosion are annealed, only small amounts of new scale form on the surface of the respective steel flat product during the subsequent annealing treatment of steel strips or sheets consisting of non-corroding steel. These can subsequently be easily removed in a conventional pickling unit. Further mechanical descaling does not, therefore, according to the invention, expressly take place between exiting the annealing furnace and entering the pickling unit. After annealing, the stainless steel strip can instead optionally pass through a unit for improving surface evenness. In the prior art, stretch-bending units or suchlike are, for example, used for this purpose. Corresponding to the above explained features of the method according to the invention, a production line according to the invention for producing a cold-rolled steel flat product consisting of a non-corroding steel comprises at least one cold-rolling stand, at least one annealing furnace and at least one unit for mechanically removing scale adhering to the cold-rolled steel flat product, wherein the at least one unit for mechanically removing scale, viewed in the conveying direction of the cold-rolled steel flat product, is arranged before entry to the annealing furnace. The steel strips and sheets produced according to the invention and consisting of a non-corroding steel have an optimised surface finish owing to the minor damage which occurs during the descaling carried out according to the invention after cold rolling and before annealing. This SI/cs 101062WO 30 June 2011 -6 optimised surface finish is only achieved by carrying out the mechanical descaling before the annealing. The units required for this purpose are already available in conventional production lines, but are employed at a different place according to the invention. Consequently, the procedure according to the invention incurs no additional costs while distinctly improving the quality of the product obtained. Of course, the mechanical descaling which takes place according to the invention upstream of the annealing furnace can be carried out by a plurality of processes possibly passed through one after another or interacting in combination. The mechanical descaling can, therefore, be carried out by particle blasting, such as sand blasting or shot blasting or by brushing, wherein these descaling means can be particularly effective if they are carried out combined with one another in a corresponding unit or in separate blasting and brushing units one after the other. Especially if descaling is to be carried out by particularly gentle blasting using fine particles, it is advisable to as far as possible fully dry or remove any liquids present on the surface of the steel flat product before the blasting treatment. In this way, the particles striking the surface of the hard-rolled steel flat product are prevented from intermixing with the liquids, such as rolling oil residues or suchlike, which are otherwise present on the surface and originate from the preceding processing stages, to form a substance which is difficult to remove and which impedes the desired removal of scale. The liquid residues can be removed by thermal treatment. Flame drying, for example, is suitable for this purpose, in SI/cs 101062WO 30 June 2011 which the surface to be cleaned is exposed to an open flame, so that the liquids present on the surface rapidly evaporate or burn. Flame drying can be carried out highly efficiently by using a so-called "booster" which produces an enveloping flame which envelops the strip to be freed from liquid. Such a booster is, for example, described in DE 10 2006 005 063 Al. If the scale is to be removed from the cold-rolled, hard rolled steel flat product by blasting treatment, then this treatment can be carried out by liquid jets, for example high-pressure water jets. In order to improve the effectiveness of the scale removal, the liquid blasting agent can carry particles with it, which abrasively remove the scale adhering to the cold-rolled, hard-rolled steel flat product. These particles can be scale particles which are obtained from the scale removed from the cold-rolled steel flat product. A conventional scale breaker can also be used to mechanically descale the cold-rolled, hard-rolled steel flat product, in which the scale adhering to the cold rolled, hard-rolled steel flat product is broken by diverting the steel flat product on at least one roll. In order to optimise the dimensional stability, the surface roughness and the mechanical properties of steel flat products produced according to the invention, the cold rolled steel flat product can be optionally skin-pass rolled or temper rolled after annealing. The method according to the invention can be executed discontinuously or in a continuous pass, depending on the SI/cs 101062WO 30 June 2011 - 8 number of cold-rolling steps to be carried out and the plant technology available. If the method is discontinuously carried out, the cold rolling can, for example, take place in multiple stages in a reversing stand operated independently from the operation of the annealing furnace. The advantage of this is that a high overall level of deformation of the cold strip can be obtained with a correspondingly high level of cold-work hardening and thereby an accompanying particularly hard surface which is not sensitive to mechanical removal of scale. Carrying out the method in a continuous pass is appropriate, for example, if large quantities of steel flat product are to be produced with the aim of saving time and a sufficient reduction in thickness can be obtained via the one or more available cold-rolling stands passed through in the pass. Variations in the conveying speed between the individual work stations of such a continuously passed through production line according to the invention can be compensated by arranging at least one strip accumulator in the conveying path of the steel flat product. A steel flat product produced according to the invention and consisting of a non-corroding steel, has a surface roughness Ra which is consistently in the range of 0.1 - 1 pm, without requiring measures to be taken for this purpose which are outside the procedure according to the invention. Particularly low surface roughnesses are produced if the stainless steel strip is temper rolled after annealing at degrees of deformation of up to 10 %, in particular 1 - 7 %. SI/cs 101062WO 30 June 2011 - 9 The invention is explained in more detail below with the help of a drawing illustrating an exemplary embodiment. The single figure shows a production line 1 for producing a cold-rolled stainless steel strip E which is passed through in a continuous pass in the conveying direction F. The production line 1 comprises in the conveying direction F, standing in line one after another, - an uncoiling unit 2 for sequentially uncoiling hot strips W wound into coils Cl, C2, which consist of a non-corroding steel and to the surface of which scale still adheres, this scale forming when the hot strips are produced, - a welding unit 3 which serves to join the end of the hot strip W wound into the one coil Cl to the beginning of the hot strip W wound into the other coil C2, when the first hot strip is fully fed into the production line 1, - a first strip accumulator 4 to compensate variations in the conveying speed of the hot strip W fed into the production line 1, - three rolling stands 5, 6, 7 which are conventional cold rolling stands, known from the prior art in different configurations, and in which the hot strip W is cold rolled into stainless steel strip E in three consecutive stages, - a second strip accumulator 8 to compensate variations in the conveying speed of the stainless steel strip E leaving the cold-rolling stand 7, SI/cs 101062WO 30 June 2011 - 10 - a first descaling unit 9, in which the scale adhering to the stainless steel strip E and broken as a result of the elongation of the stainless steel strip E which occurred when passing through the cold-rolling stands 5, 6, 7, is mechanically removed from the stainless steel strip E by shot blasting, - a second descaling unit 10, in which the scale still adhering to the stainless steel strip E after leaving the descaling unit 9 is mechanically removed from the stainless steel strip E by brushing, - a continuous annealing furnace 11, in which after leaving the descaling unit 10 in a continuous pass the mechanically descaled stainless steel strip E is heated to a sufficiently high annealing temperature over an annealing time which is long enough for hardening of the stainless steel strip E, which developed in the course of cold rolling and mechanical descaling, to be eliminated and for a sufficiently soft stainless steel strip E to be obtained for further metal forming processes, - a stretch-bending unit 17 for improving the surface evenness of the stainless steel strip E which follows the continuous annealing furnace 11 and is passed through with no stage for mechanically processing the surface of the stainless steel strip E being placed in between, - a pickling unit 12 for chemically removing the scale still present on the stainless steel strip E which follows the unit 17 and is passed through with no stage for mechanically processing the surface of the stainless steel strip E being placed in between, SI/cs 101062WO 30 June 2011 - 11 - a further strip accumulator 13 to compensate variations in the conveying speed of the annealed stainless steel strip E exiting from the continuous annealing furnace 11, - a skin-pass rolling stand 14, arranged at the outlet to the strip accumulator 13, for temper rolling the stainless steel strip E at an overall degree of deformation of up to 10 %, - a last strip accumulator 15 to compensate variations in the conveying speed of the annealed stainless steel strip E exiting from the skin-pass rolling stand 14 and - a coiling unit 16, equipped with two coils to be employed alternately, for coiling the stainless steel strip E exiting from the strip accumulator 15. The hot strip W which is unwound from the respectively in use coils C1 or C2, has scale adhering to it, is where appropriate joined in the welding unit 3 to the end of the previously processed hot strip W and is produced from a non-corroding steel in a conventional way, is fed into the first cold-rolling stand 5 via the strip accumulator 4 and is then cold rolled into the cold-rolled stainless steel E in the subsequently passed through cold-rolling stands 6, 7 in a total of three stages. As a result of the stainless steel strip E being reduced in thickness, which occurs via the cold-rolling stands 5, 6, 7, the stainless steel strip E is elongated, so that the scale adhering to it, owing to the surface tensions which arise, flakes off from the hot strip W in coarse pieces or is loosened. SI/cs 101062WO 30 June 2011 - 12 After exiting the last cold-rolling stand 7, the scale still adhering to the stainless steel strip E now obtained, which has been cold rolled to the desired thickness and hardened as a result of cold rolling, is mechanically descaled in the first descaling unit 9 by directing a particle blast with high kinetic energy at the hardened surfaces of the stainless steel strip E. The particle blast can be a shot blast, for example, as is already used in the prior art for descaling, but at another place in the process. In the second descaling unit 10, the stainless steel strip E, which has been mechanically descaled by blasting in such a way, has the scale still present there brushed off it by means of brushes. Thus, when it leaves the descaling unit 10 and enters the continuous annealing furnace 11 only minor, fine scale residues adhere to the surface of the stainless steel strip E. As an alternative to or in addition to the units 9, 10, a descaling unit, which is not illustrated here, can be provided, in which the scale adhering to the stainless steel strip E is removed by means of a high-pressure liquid jet. The liquid jet, output under high pressure and striking the surface of the strip to be descaled with high kinetic energy, can in the process carry particles with it, in order to increase the effectiveness of the scale removal. These particles can be collected scale particles of a certain grain size which are mixed with the liquid coming out of the jet, for example water. When it passes through the continuous annealing furnace 11, the stainless steel strip E is heated to a temperature, in SI/cs 101062WO 30 June 2011 - 13 which the hardened microstructure of the stainless steel strip E is softened again. The length of the continuous annealing furnace 11, the speed the stainless steel strip passes through it and the annealing temperature are coordinated in such a way that the microstructure is softened as required at the end of the continuous annealing furnace 11. Of course, the continuous annealing furnace 11 can be divided into a plurality of zones for this purpose, in which different temperatures prevail, so that an optimum annealing result can be achieved. Only a small amount of new scale forms on the stainless steel strip E, despite the comparably high annealing temperature, owing to its alloying and, as a consequence, the minimised susceptibility to corrosion. The amount of scale adhering to the stainless steel strip E when it exits from the annealing furnace is so small that it is as far as possible fully removed from the surface of the stainless steel strip E by the effect of the pickling agent acting on the stainless steel strip E in the pickling unit 12. Before entering the pickling unit 12, the stainless steel strip E still, however, passes through the stretch-bending unit 17 arranged in the conveying direction F behind the annealing furnace 11. In this stretch-bending unit 17, the stainless steel strip E is deformed in a known way by multiple changes in direction, such that when it directly afterwards enters the pickling unit 12 which is then passed through it has an overall improved surface evenness. The skin-pass rolling carried out after exiting the pickling unit 12 in particular serves to improve the surface roughness of the stainless steel strip E, wherein additionally the dimensional stability and the mechanical properties are optimised before it is wound into a coil 3 SI/cs 101062WO 30 June 2011 - 14 or 4 in the coiling unit 16. The surface roughness values can be almost halved by temper rolling carried out at degrees of deformation of typically 5 - 7 %, so that after temper rolling an optimally smooth product is available. SI/cs 101062WO 30 June 2011 - 15 REFERENCE SYMBOLS 1 Production line 2 Uncoiling unit 3 Welding unit 4 Strip accumulator 5, 6, 7 Cold-rolling stand 8 Strip accumulator 9 First descaling unit 10 Second descaling unit 11 Continuous annealing furnace 12 Pickling unit 13 Strip accumulator 14 Skin-pass rolling stand 15 Strip accumulator 16 Coiling unit 17 Unit for improving surface evenness C1, C2 Coils from hot strip W E Stainless steel strip F Conveying direction W Hot strip SI/cs 101062WO 30 June 2011
Claims (16)
1. Method for producing a cold-rolled steel flat product (E) from a hot strip (W) with scale adhering to it and consisting of a non-corroding steel, in which the hot strip (W) with scale adhering to it is cold-rolled into the steel flat product (E), in which the cold rolled steel flat product (E) is annealed, and in which the cold-rolled steel flat product (E) is descaled, characterised in that the cold-rolled steel flat product (E) obtained after cold rolling the hot strip (W) is subjected to descaling treatment in the hard-rolled state before annealing, in which the scale present on the cold-rolled steel flat product (E) is mechanically removed.
2. Method according to Claim 1, characterised in that descaling of the cold-rolled, hard-rolled steel flat product (E), which is performed before annealing, is carried out by blasting with solid particles.
3. Method according to either of the preceding claims, characterised in that liquid residues present on the cold-rolled, hard-rolled steel flat product (E) are removed by thermal treatment before descaling.
4. Method according to any one of the preceding claims, characterised in that descaling of the cold-rolled, SI/cs 101062WO 30 June 2011 - 2 hard-rolled steel flat product (E), which is performed before annealing, is carried out by brushing.
5. Method according to any one of the preceding claims, characterised in that descaling of the cold-rolled, hard-rolled steel flat product (E), which is performed before annealing, is carried out by liquid jets.
6. Method according to Claim 5, characterised in that the liquid jets carry particles with them which abrasively remove the scale adhering to the cold-rolled, hard rolled steel flat product (E).
7. Method according to any one of the preceding claims, characterised in that descaling of the cold-rolled, hard-rolled steel flat product (E), which is performed before annealing, is carried out by diverting the steel flat product on at least one roll of a scale breaker.
8. Method according to any one of the preceding claims, characterised in that the cold-rolled steel flat product (E) after annealing optionally passes through a unit for improving its surface evenness and is pickled.
9. Method according to any one of the preceding claims, characterised in that the cold-rolled steel flat product (E) is skin-pass rolled or temper rolled.
10. Method according to any one of the preceding claims, characterised in that its production steps are executed discontinuously. SI/cs 101062WO 30 June 2011 - 3
11. Method according to any one of Claims 1 to 9, characterised in that its production steps are executed in a continuous pass.
12. Method according to any one of the preceding claims, characterised in that the surface roughness Ra of the obtained cold-rolled steel flat product (E) consisting of a non-corroding steel is 0.1 - 1 pm, in particular 0.3 - 0.7 pm.
13. Production line for producing a cold-rolled steel flat product (E) consisting of a non-corroding steel, comprising at least one cold-rolling stand (5, 6, 7), at least one annealing furnace (11) and at least one unit (9, 10, 12) for mechanically removing scale adhering to the cold-rolled steel flat product (E), characterised in that the at least one unit (9, 10) for mechanically removing scale, viewed in the conveying direction (F) of the cold-rolled steel flat product (E), is arranged before entry to the annealing furnace (11).
14. Production line according to Claim 13, characterised in that the cold-rolling stand (5, 6, 7) is a reversing stand operated independently from the operation of the annealing furnace (11).
15. Production line according to Claim 13, characterised in that the cold-rolling stand (5, 6, 7), the unit (9, 10) for removing scale and the annealing furnace (11), viewed in the conveying direction (F) of the steel flat product (E), are arranged one after another on a SI/cs 101062WO 30 June 2011 conveying section in such a way that they are passed through successively in a continuous sequence.
16. Production line according to Claim 15, characterised in that at least one strip accumulator (4, 8, 13, 15) is arranged in the conveying path of the steel flat product (E). SI/cs 101062WO 30 June 2011
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010026757.0 | 2010-07-09 | ||
DE102010026757A DE102010026757B4 (en) | 2010-07-09 | 2010-07-09 | Method and production line for producing a cold-rolled steel flat product from a stainless steel |
PCT/EP2011/061155 WO2012004205A1 (en) | 2010-07-09 | 2011-07-01 | Method and production line for producing a cold rolled flat steel product from a rustproof steel |
Publications (1)
Publication Number | Publication Date |
---|---|
AU2011275945A1 true AU2011275945A1 (en) | 2013-01-24 |
Family
ID=44629443
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU2011275945A Abandoned AU2011275945A1 (en) | 2010-07-09 | 2011-07-01 | Method and production line for producing a cold rolled flat steel product from a rustproof steel |
Country Status (11)
Country | Link |
---|---|
US (1) | US20130205855A1 (en) |
EP (1) | EP2591128A1 (en) |
JP (1) | JP2013536082A (en) |
KR (1) | KR20130027051A (en) |
AU (1) | AU2011275945A1 (en) |
BR (1) | BR112013000536A2 (en) |
DE (1) | DE102010026757B4 (en) |
RU (1) | RU2562599C2 (en) |
TW (1) | TW201211269A (en) |
WO (1) | WO2012004205A1 (en) |
ZA (1) | ZA201300198B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9333625B1 (en) * | 2014-12-05 | 2016-05-10 | The Material Works, Ltd. | Method of descaling stainless steel |
CN106808371B (en) * | 2016-03-31 | 2019-12-03 | 河北领程环保科技有限公司 | A kind of abrasive water-jet sheet metal strip cleaning production line and application method |
CN105922349B (en) * | 2016-05-03 | 2018-12-18 | 上海日成电子有限公司 | Wire casing automatic side hole punching machine |
EP3470145B1 (en) * | 2017-10-10 | 2022-03-16 | Outokumpu Oyj | Method for partial cold deformation of steel with homogeneous thickness |
KR102010059B1 (en) * | 2017-12-13 | 2019-08-12 | 주식회사 포스코 | Wire rod descaler apparatus and descaling method |
FI128282B (en) * | 2019-01-28 | 2020-02-28 | Outokumpu Oy | Method for manufacturing of stainless steel strips |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU899189A1 (en) * | 1980-05-22 | 1982-01-23 | Днепропетровское Отделение Института Механики Ан Усср | Method of hydroabrasive cleaning of cold metal from scale |
JPS56168907A (en) * | 1980-05-31 | 1981-12-25 | Nisshin Steel Co Ltd | Manufacture of stainless steel sheet finished by grinding |
JPH0622728B2 (en) * | 1986-05-16 | 1994-03-30 | 大同特殊鋼株式会社 | Descaling method for shape memory alloy thin plate |
US5197179A (en) | 1991-04-18 | 1993-03-30 | T. Sendzimir, Inc. | Means and a method of improving the quality of cold rolled stainless steel strip |
FI954819A (en) * | 1994-10-14 | 1996-04-15 | Mannesmann Ag | Process and apparatus for producing high-grade cold-rolled strip iron of hot-rolled coarse strip iron |
KR100206504B1 (en) * | 1995-04-14 | 1999-07-01 | 다나카 미노루 | Equipment for manufacturing stainless steel strip |
FR2740061B1 (en) * | 1995-10-19 | 1997-11-28 | Ugine Sa | PROCESS FOR THE CONTINUOUS DEVELOPMENT OF A STRIP OF LAMINATED SHEET OF STAINLESS STEEL HAVING AN IMPROVED SURFACE CONDITION |
DE19749466C1 (en) * | 1997-11-08 | 1998-12-24 | Bwg Bergwerk Walzwerk | Production of rolled or cast metal strip with descaled surface, especially strip consisting of special steel and titanium alloys |
DE10022045C1 (en) * | 2000-02-22 | 2001-07-19 | Sundwig Gmbh | Finishing line for continuously producing cold-rolled metallic strips comprises a device for pickling the strip arranged in region of the start, the conveyor path of the strip and cold roll stands arranged before/after the pickling device |
JP2001293514A (en) * | 2000-04-12 | 2001-10-23 | Nippon Steel Corp | Highly efficient descaling method |
DE102006005063A1 (en) | 2006-02-03 | 2007-08-09 | Linde Ag | Process for the heat treatment of steel strip |
FI20070622L (en) * | 2007-08-17 | 2009-04-15 | Outokumpu Oy | Method and device for checking evenness during cooling of a strip made of stainless steel |
-
2010
- 2010-07-09 DE DE102010026757A patent/DE102010026757B4/en not_active Expired - Fee Related
-
2011
- 2011-07-01 KR KR1020137003486A patent/KR20130027051A/en not_active Application Discontinuation
- 2011-07-01 JP JP2013519019A patent/JP2013536082A/en active Pending
- 2011-07-01 RU RU2013105473/02A patent/RU2562599C2/en not_active IP Right Cessation
- 2011-07-01 EP EP11738649.0A patent/EP2591128A1/en not_active Withdrawn
- 2011-07-01 WO PCT/EP2011/061155 patent/WO2012004205A1/en active Application Filing
- 2011-07-01 BR BR112013000536A patent/BR112013000536A2/en not_active Application Discontinuation
- 2011-07-01 US US13/809,060 patent/US20130205855A1/en not_active Abandoned
- 2011-07-01 AU AU2011275945A patent/AU2011275945A1/en not_active Abandoned
- 2011-07-08 TW TW100124228A patent/TW201211269A/en unknown
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2013
- 2013-01-08 ZA ZA2013/00198A patent/ZA201300198B/en unknown
Also Published As
Publication number | Publication date |
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TW201211269A (en) | 2012-03-16 |
US20130205855A1 (en) | 2013-08-15 |
KR20130027051A (en) | 2013-03-14 |
RU2562599C2 (en) | 2015-09-10 |
WO2012004205A1 (en) | 2012-01-12 |
DE102010026757A1 (en) | 2012-01-12 |
EP2591128A1 (en) | 2013-05-15 |
DE102010026757B4 (en) | 2012-07-05 |
BR112013000536A2 (en) | 2016-05-24 |
RU2013105473A (en) | 2014-08-20 |
JP2013536082A (en) | 2013-09-19 |
ZA201300198B (en) | 2013-09-25 |
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