TW527235B - Method for manufacturing cold rolled metal strip having improved surface roughness - Google Patents

Abstract

19990234816

Description

527235 A7 V. Description of the invention (1 Invention back i: Ming · A method for manufacturing cold rolled metal sheets, which does not need to be used for thickness reduction and cold forging = such as-heat-treated metal sheets for hot strip annealing and / or pickling. The following steps are included: tensioning and flattening a heat-treated metal sheet to break the hard crust and flattening it; sandblasting the metal sheet to ablate its hard crust; positioning = and two pairs of cymbals on the surface of the metal sheet Nearby and waiting in the opposite direction to remove any remaining crust and provide a light

And to reduce the thickness of the cleaned metal sheet to make the surface L. In the conventional practice, flatten the hot-dried metal sheet machine before doing the thickness reduction and dry. Wu Guo Patent No. 4,872,245 discloses a processing line for rolling steel sheet from gas 3 to rolling. The patent reveals that the cold sheet manufacturing station B and the D4 tension leveler extend the uncle's metal sheet by no more than 7%. The tension leveler has a clock to level the metal sheet and make the hard surface of the metal sheet horizontal. rupture,. Long metal pieces are removed in the form of a tandem rolling mill for the reduction of ethyl acetate and-pickling tanks. Passing-the know-how of brushing fire has no need to let hot dry and / Or pickling can be used to reduce the thickness of cold-extinguished metal sheet No. 5,197,179-a kind of continuous processing line made from hot-dried metal sheet / Wu Guo. The patent discloses that-hot-dried metal sheets are passed through :: fire :::-thickness cold rolling tandem rolling mill or reversible rolling & washing. It is also known that there is no need to perform annealing for thinning and cold-drying knitting. And / or pickling to remove the crust of the hot-dried metal sheet. ^ _ _4- This paper is printed on the scale of the paper cap (CNS) A4 Secretary 527235 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (2) The leather method includes one or more of the following steps: The tension is flattened to rupture the crust and flatten the metal sheet; the metal sheet is sandblasted to remove the crust and mechanically brushed through the hot-rolled metal sheet prior to thickness reduction and cold rolling. U.S. Patent No. 5,606,787 discloses a continuous processing line for manufacturing cold-rolled stainless steel from hot-rolled metal sheets. The patent discloses-hot rolled metal sheet pass-a tandem cold milking machine, a continuous annealing furnace, an optional molten salt tank, an acid scrubber and an optional tempering mill. It is not necessary to sand blast and anneal the metal sheet before reducing the thickness of cold rolling to produce a surface roughness of less than 80 microinches after the early cold rolling t. U.S. Patent No. 5,554,235 discloses a continuous processing line for manufacturing cold-rolled stainless steel, which typically requires annealing or pickling before a hot-rolled metal sheet is subjected to cold rolling in an in-line mill. The patent discloses that a hot-rolled metal sheet is optionally stretched in a flattener to flatten the metal sheet and rupture the crust, and then use a sand blasting machine or brush mill to remove the crust before performing cold rolling. . After cold rolling, the metal sheet may optionally be passed through a conventional annealing furnace, another sand blasting machine, a brush mill, an acid cleaner and a tension leveler. Japanese Patent Application No. 55_1338002 discloses a processing line for manufacturing cold-rolled steel from hot-rolled metal sheets, which does not require annealing or pickling of hot-rolled steel before cold rolling. The hot-rolled metal sheet ruptures the crust using a force leveler, passes through a high-pressure water curtain, and finally passes through a brush roll before passing through a cold-rolling mill. However, the requirements for the flatness and roughness of the surface of the cold-rolled steel to be thickened are increasingly severe in applications such as non-fronted steel sheets and pipes used in sinks, home appliances, and automotive decoration. These applications often require that the flatness across the width of the metal sheet of the thickened cold rolled metal sheet does not exceed 20 I-units and the surface roughness is less than 0.4 micron Ra. It is not necessary to perform hot strip annealing and / or acid paper size before thickness reduction and cold rolling in accordance with the Chinese National Standard (CNS) A4 specification (210 ^ ---------- clothing ------). --Order --------- (Please read the notes on the back before filling this page) -5- 527235 A7 B7 V. Invention description (3 (Please read the notes on the back before filling this page) Washing and rolling metal; t Μ manufacturing method can not be manufactured after reducing the thickness of cold rolling to meet the above consumer needs (necessary flatness and surface smoothness. Therefore, it is currently necessary to produce cold rolled metal sheet (especially stainless steel) An improved method, which does not require hot strip annealing and / or pickling before a heat-treated metal sheet is subjected to thickness reduction and cold rolling to have a beautiful surface. At present, a kind of heat-treated iron f-type sheet is also required before thickness reduction and cold rolling. A method for peeling without requiring hydrochloric acid or sulfuric acid for pickling. At present, a method for peeling heat-treated stainless steel sheets without requiring nitric acid, hydrofluoric acid, or fluoride is also required. SUMMARY OF THE INVENTION The present invention relates to— Method for manufacturing cold-rolled metal sheet without heat-treating a heat-treated metal sheet before cold-thickening Annealing and / or pickling even if the cold-rolled metal sheet has a glossy surface. The main object of the present invention is to propose a metal sheet that is reduced in thickness and cold-rolled to the final gauge size without having to reduce the thickness before cold-rolling. The metal sheet is annealed or pickled. Another object of the present invention is to make the reduced thickness cold-rolled metal sheet have a glossy surface with a surface roughness of less than 0.4 microns Ra and at the same time meet standard tolerances. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Another object of the present invention is to make the flatness across the width of the thinned cold-rolled metal sheet not more than 20 I-units. An additional object of the present invention includes proposing a peeling method that causes environmental disposal Problematic by-product pickling solutions (especially nitric acid or hydrogen acid or fluoride) are no longer formed or minimized, and provide a cost advantage over steel sheets made by annealing and pickling before thinning and cold rolling Products. -6-

527235 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, and a description of the invention (4): The invention includes the following steps: tension flattening a heat-treated metal sheet to rupture and flatten the metal sheet; The surface is sandblasted ^ to ablate its hard skin; at least two products are arranged near the surface of each metal sheet: the cleaning brushes are rotated in opposite directions to each other to remove any residue:, and the mother-metal sheet surface is provided with _ predetermined roughness With-brush polishing: After the mother cleans the surface of the metal sheet to further reduce the roughness, and later the metal sheet is thickened and cold rolled to make the surface have a glossy surface layer. The present invention < Another feature is that the metal sheet is stretched by a tension of at least 1%. % Another feature of this month is that the surface roughness of these polished surfaces before thickness reduction and cold rolling is less than 1.5 micrometers Ra. What is the special desire of 3? The surface density of 6 scoops of Hai and other cleaning brushes is greater than 12% per square surface area. Another feature of Fayue is that the cleaning brushes have bristles with a diameter of 〇3 to 005 mm. ° Another feature of the present invention is that the surface of the reduced thickness cold rolled metal sheet has a crude sugar yield of less than 0.4 micrometers Ra. Still another feature of the present invention is that the metal sheet is reduced in thickness and cold rolled by at least the thickness. Another feature of the present invention is to include at least three of the aforementioned cleaning brushes near the surface of each metal sheet. Another feature of the present invention is that at least the particle size of the blasted particles is 0.10 to 0.50 mm. The core advantages of the present invention include: reducing manufacturing costs; causing environmental disposal of this paper-sized wiper. Home Standard (CNS) A4 specification (210 X 297 public compound f · clothing -------- order · --- ----- (Please read the notes on the back before filling this page) 527235

V. Description of the invention (5) The by-product pickling solution (especially tritium or hydrofluoric acid or fluoride) printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs is reduced to a minimum; and hard skin " dust ( dust) " Recycled to a melting refining furnace. The method of the present invention eliminates the need for expensive pollution control and waste treatment facilities. The foregoing and other objects, features, and advantages of the present invention will become clearer after reading the following detailed description and drawings. Schematic illustration

Figure 1 is a sketch of the invention's continuous processing line made of-heat-treated metal sheet-cold rolled metal sheet, which includes the following steps: tensioning the heat-treated metal sheet 4 'sandblast cleaning the metal sheet; brush the Gold metal sheet and thickness M of the metal sheet. W Preferred Embodiment Detailed description The metal sheet of the present invention can be made of a metal melt (especially a chromium-containing steel melt), and the metal melt can be continuously cast into a metal sheet with a thickness of 210 mm and a thickness of U40 mm. A thin metal plate, a thick metal plate i with a thickness of 100 mm, or a cast metal ingot. The cast metal is then heat treated into a continuous length of soil sheet. The term "hot processed" is understood to mean that the metal sheet is reheated when necessary, and then reduced to a pre-full thickness, for example, by hot rolling. If hot rolling is to be performed, the steel sheet may need to be reheated to 1050 to 1.300. (: Hot rolling uses a minimum of 800 ° C. And a finishing temperature of about 650 ° C / dish. In addition, the hot-rolled metal sheet is peeled and reduced in thickness by at least 30% and reduced by at least 30% of the thickness to achieve the final J gauge thickness. After that, the cold-rolled sheet The metal sheet can be annealed and re-annealed. The present invention has a significant advantage _ that the heat-treated metal sheet does not need to be reduced by -8-this paper is suitable for the country of wealth (CNS) A4 size (Q χ Norwegian) ----- · ------------------ Order --------- (Please read the notes on the back before filling out this page) Employee Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs Printing 527235 Α7 ---------- B7 V. Description of the invention (6) Annealing before thick cold rolling, that is, hot strip annealing. Another aspect of the present invention is also significantly superior. In order to heat treat the metal sheet, it is not necessary to perform chemical treatment before the thickness reduction and cold rolling, that is, pickling to remove the crust. The metal sheet of the present invention can be made of heat treated metal sheet made of different metals and different methods. The metal sheet can Made of sheet metal made of metal ingots' or made of a continuously cast metal sheet that is reheated and then hot rolled to provide an initial heat-treated metal sheet with a thickness of 2 to 6 mm, or the sheet can be made by continuous casting The heat treatment is made of a metal sheet with a thickness of 2 to 10 mm. The present invention can also be applied to a metal sheet made by the following methods: a continuous casting metal plate or a metal plate made of metal bonds directly rhyme · into a hot rolling Machine, whether or not there is obvious heating; reduce the thickness of the metal ingot and hot-roll into a metal plate with sufficient temperature and then hot-roll into a metal sheet, whether or not there is further heating; directly cast molten metal into a metal sheet suitable for further processing. The metals of the present invention may include, but are not limited to, ferrous metals such as low carbon steel, chrome alloy steel, ferrous iron stainless steel, Vostian iron stainless steel, Asada loose iron stainless steel, and non-ferrous metals such as titanium Steel and nickel. An important feature of the present invention is that a heat-treated metal sheet is sufficiently extended by tension (preferably at least about 1%, more preferably 2 to 10%, and most 2 to 2 to 7%) so that The fragile crust on both sides of the metal sheet loosens = ruptures and flattens the metal sheet if necessary. As will be explained below, the cracked crust is ablated by mouth, followed by cleaning and polishing. The metal sheet is applied with tension to eliminate wrinkles to form a " dead at " gold = plus includes-a tempering mill or preferably a multi-turn lighter and tensioner. = Force leveler. Make the metal sheet It is important to extend at least 10 / 〇, because many -9-This paper size applies to the Chinese National Standard (CNS) Xr specification (2Κ) χ 297 ^ 5 ^ ------- · ------- -Order --------- (Please read the notes on the back before filling out this page) 527235 V. Description of the invention (7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs, the use of stainless steel sheets often requires stainless steel sheets The flatness of the span width is less than I-units, preferably about * more than 201 units. The unit of straightness is the relationship between the height of a metal plate and its wavelength, and it is defined by the following M: ton L2) / L2X10 · 5 '· where L1 is the longest length of the metal piece and L2 is the shortest length of the metal piece . A The present invention has a very important feature of using abrasive grains (that is, abrasive grains with sharp corners or beer-like surfaces, preferably spherical blasting grains) to heat-treat the metal sheet by sandblasting to remove cracked crust. In the present invention, a hard metal sheet is used; the surface is sandblasted because in addition to removing the broken pieces caused by stretching, considerable blow cleaning is required to ensure the removal of hot-rolled hard crust, especially the difficult to remove fertilizer particles. Iron stainless steel and Vostian stainless steel crust. The applicable grains of the present invention may be iron-type spherical blasting grains or jagged abrasive grains, wherein at least 95% of the grains are at least 0.1 mm in diameter. Preferably, the particle size of at least 45% of the particles is 疋 30 to 0.50 mm. More preferably, at least 90% of the particles will have a particle size of 0.10 to 0.50 mm. Optimally, the particle size of 45% to 55% particles will be 0.1 to 0.30 mm, and the particle size of 45% to 55% particles will be greater than 0 30 mm and less than 0.50 mm, and not more than 10% particles. The diameter will be greater than 0.50 mm. The key point is that at least 95% of the abrasive particles have a particle size of at least 0 丨 0 mm to provide sufficient impact energy and good particle dispersion for the width of the metal sheet (that is, a certain number of particles per single time) Impact) to provide satisfactory cleaning results. Another important point is that the composition analysis of an abrasive sample has a particle size of no more than 丨 0%. The particle size is greater than 0.50 mm. This is because the impact of excessive energy will cause the flat surface to be rough The degree of chain (Ra) is greater than the degree that can be removed in subsequent processing. Non-particles such as glass, silica, alumina, etc., which cannot be used as abrasives in this invention, will be cents of gold. Order --------- (Please read the precautions on the back before filling this page ) -10- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) Power 235

527235 A7 V. Description of the invention (9 The surface layer printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. Preferably, the diameter of the bristles of the bristles should be 13 to 025 ba. As the bristles of the reverse rotation cleaning brush of the present invention It has a hair tip diameter as small as 0 · ΐ3Γν centimeters, so there is also a book A, heavy ·; it is because the bristles have a sufficient surface thickness (that is, the bristles are sufficiently tightly packed), allowing the bristles to penetrate into the sandblasted metal; Small potholes have decided that the bristles-preferably minimum = areal density is at least 12% per unit squared surface area, and more preferably at least 20%. Early squared surface area is defined as square unit / square unit surface area, such as 0.12 square centimeter / ; 1 cm 2 surface area and 0 20 cm 2 "cm 2 surface area are 12% and 20% respectively. A The wire brush was chosen as the cleaning brush because the cleaning brush using synthetic bristles cannot remove metal from the surface of the metal sheet. The synthetic brush is Woven type and matte type are made of carbide impregnated with different quantities and sizes of abrasive materials: designed like nylon bristles. Use these synthetic bristles Cleaning brushes made by impregnation, such as carbonization, are not suitable for the reverse rotation cleaning brushes of the present invention. Cleaning brushes made of synthetic bristles are not suitable because the metal sheet is more likely to be due to the metal that is ground from the surface. Recycling loss of up to 2%. On the other hand, steel brushes are less likely to grind or erode the surface of metal sheets. One of the preferred wire brushes for use in the present invention is produced by the Maryland Βγ_commpany company in Baltimore, Maryland. This type of wire The structure of the brush is to install wire bristles on a metal coil and wind the coil on a brush rod with a spiral wound wire. Preferably, the brush surface has a bristle density of at least 12% per unit square surface area. If the density is less than 12%, the coverage of the bristle tips on the surface of the metal sheet is not enough to completely remove all the crusts. Unlike conventional techniques, it is of great significance for these cleaning brushes to rotate in opposite directions to each other. Reasons for this requirement Oxygen makes noodles clean. -------- Order --------- CPlease read the phonetic on the back? Matters before filling out this page) -12- 527235 Employees of Intellectual Property Bureau, Ministry of Economic Affairs Printed by Consumer Cooperative A7 The explanation (1〇) is that it is experimentally proven that the tip of the bristles can be removed from the metal cymbals and cymbals; the concave area of the human X drinking Qiaoyi surface such as / Sier Wang removes the crust. Preferably, in each order & Master ^. 'To the soil V near the surface of the sheet, install three such cleaning brushes. If there are three cleaning brushes, the first cleaning brush is preferably rotated in the direction opposite to the direction of travel of the metal sheet. = The cleaning brush rotates clockwise and the metal sheet is from left to right, then the second: the cleaning brush rotates counterclockwise, the third cleaning brush rotates clockwise = turn ... etc. This invention & lt An important feature of decisiveness is that the heat-treated clean metal sheet will be additionally subjected to: polishing brush treatment to reduce the surface roughness to less than 2.0 micron Ra, preferably not more than 5 micron Ra, before thickness reduction and cold rolling. It is optimal not to overshift Ra by 1.0 micron, thereby producing a matte layer. This final polishing brush has synthetic bristles, but a brush with wire bristles is still preferred. For some stainless steel applications, it is necessary to reduce the surface roughness after cold rolling to less than 0.4 micrometer Ra, and preferably less than 0.3 micrometer Ra. In order to ensure that this type of glossy surface is achieved, the surface roughness should not exceed 1 :: 5 microns Ra before thickness reduction and cold rolling. In order to better understand the present invention, a schematic drawing of a continuous processing line for manufacturing a cold-rolled metal sheet from a heat-treated metal sheet is shown in FIG. It should be understood that this processing line can also use solo processing units. This processing line includes the following steps: A heat-treated metal sheet 12 is unrolled from the reel feed roll 10. The end of the metal sheet is cut flat by a male cutting machine 14 and welded by a fusion splicer 16 for continuous processing. The 1¾ continuous metal sheet then passes through a looper 20, which includes a feed-in tension roller 18 and a feed-out tension roller 22. Then, the metal sheet is stretched by a tension leveler 24, which includes tension rollers 28 and 30 and turning rollers 26. These stretching and bending turning effects make the metal -13- this paper-scale stab scarves (CNS) A4 post 1 -------- β --------- (Please read the back first Please pay attention to this page and fill in this page again) 527235 The brush is clean and smooth and the left and right lines reduce its A7. V. Description of the invention (11 pieces are flattened into a "flattened" state and the crust is broken and relaxed. Then stretched The metal sheet 12A passes through a sand blasting machine 34, and most of the hard skin is detached from the metal blasting machine. Then the local cleaning surface of the metal sheet 12B passes through the brush area 3 6, and the cleaning area includes a plurality of pairs of cleaning brushes 3. 8, 4 2, 4 6 Use a bow to remove any remaining hard skin and reduce the surface roughness of the metal sheet. The cleaning brush will include at least two pairs of brushes 3 8 and 4 2 and preferably a second ^ brush 46 Side by side on the opposite side of the metal sheet, that is, each pair of brushes: one pair is above the metal sheet and the other is below. The important point is that the rotation direction of each cleaning is the same as the adjacent cleaning brush, that is, on the same side of the metal sheet Upper: The two brushes are opposite. For example, in the cleaning area 36, the upper cleaning brush 38: the clock rotates in all directions, and the upper cleaning brush 4 2 to reverse The clock direction rotates and the upper cleaning brush 46 rotates in a clockwise direction, as shown by arrows 40 and 0 respectively. The lower cleaning brushes are completely opposite, that is, the lower cleaning brush 38 rotates counterclockwise, and the lower cleaning brush 42 rotates clockwise. Rotate in the opposite direction and rotate it in a counter-clockwise direction. Preferably, the direction of rotation of the "pair of cleaning brushes" is the opposite direction of the metal sheet 12B. The metal sheet shown in the figure is from the right to the right. Then clean the metal. The sheet 12C is passed through a pair of side-by-side polishing brushes 50, one on top and one on the bottom, for reducing the surface roughness of the metal sheet to V5 micrometer Ra, preferably less than about 10 micrometer Ra. Processing shown in Figure There are two pairs of polishing brushes 50. Then the polished metal sheet 1 2D is used to reduce the thickness of the cold milk in a line machine or Z Xing L machine (not shown), and its thickness is preferably at least 30%. The surface of the thick cold-rolled metal sheet 12E will have a glossy surface layer, and the surface roughness is preferably not more than 0.3 micrometers Ra. Then the highly polished gold splash sheet 2E can be re-wound into a bundle by a force roll 58. Figure ^ The method shown can

0 ^ ^ --------- ^ 0 --- (Please read the precautions on the back before filling this page)

527235 A7

1 D. Please read the notes on the back before filling in the pages.

527235 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 V. Description of the invention (13) Z-thickness reduction cold rolling mills for thickness reduction cold rolling, whose thickness is reduced by 40%. The surface roughness of the work roll is less than L3 microns Ra. After the reduced thickness cold rolling, the surface roughness of the finished reduced thickness cold rolled stainless steel sheet was about 0.4 micrometers Ra, that is, the # 1 degree of polishing. A desired surface roughness is less than 0.4 micrometers Ra. _Better 2-D Polishing requires that the surface roughness of the cold-rolled stainless steel sheet to be thickened should not exceed 0.3 microns Ra. Example 2 In an example for implementing the present invention, a _20 cm thick Vostian Tiebu steel plate was used as hot milk in a hot rolling mill to produce a 2.5 mm thick stainless steel sheet. This stainless steel sheet was treated as described in Example 丨 except for the following differences. The drawn stainless steel sheet was passed through a sand blasting machine which used steel particles having a sampling diameter of 029 mm. Then, the sandblasted stainless steel sheet was cleaned with a brush produced by Brush Company, and the cleaning brushes were installed on both sides of the stainless steel sheet 夂 and rotated in opposite directions to each other. These cleaning brushes have wire bristles having a bristle tip diameter of 0.25 mm. The bristles density of the brush is 21 /. No crust was visible to the naked eye on any surface of the stainless steel sheet. The thickness of the stainless steel sheet after cleaning was reduced by 0.001 A centimeter due to the grinding of the wire brush. Then, the stainless steel sheet passed between the _parallel Scotch_brite @ polishing brushes, which are the products of the Minnesota Minerals and Manufacturing Company of Minneapolis, Minnesota. -Install this brush on the opposite side of the non-recording steel sheet. The pair of brushes are rotated at a rotational speed of face to side per minute in a direction opposite to the direction of travel of the stainless steel sheet. The surface roughness of this highly polished stainless steel sheet was 15 micrometers Ra. Then the polished stainless steel sheet is made by a tandem-type four-light-thickness cold-drying machine for thickness reduction and cold-drying, and its thickness is -------- order --------- '(Please read first (Notes on the back, please fill out this page) 16

5. Description of the invention (14) minus 50%. The surface roughness of the work roll is 0. After the thickness reduction and cold rolling, the thickness reduction is completed. The rolling surface roughness of the cold rolled stainless steel sheet is less than 0.30 micrometers Ra and reaches " Construct flat, and shape energy. ^. The surface roughness of the stainless steel sheet with straightening shape is less than 0.26 μm Ra and as low as 0.13 μm Ra. This example proves that the self-decreasing stainless steel sheet of the present invention has an excellent 2-D gloss (e.g., not more than 0.3 micron Ra) gloss surface without being annealed or pickled before being thinned. ≪ Thickened cold rolled stainless steel sheet. In addition, there is no need for recovery loss caused by grinding the surface of the stainless steel sheet by other methods. In this example, less than 0.01 mm, that is, less than 0.5% of the total metal surface thickness was removed. It should be understood that various modifications can be made to the invention without departing from the spirit and scope of the invention. Therefore, the limits of the present invention should be determined by the scope of the attached patent application. —.------------------ Order --------- (Please read the precautions on the back before filling out this page) Staff Consumption of Intellectual Property Bureau, Ministry of Economic Affairs Cooperative printed private-17- This paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Claims (1)

527235 A8 B8 C8 Patent Application No. 891〇5373 Chinese Application for Amendment of Patent Scope (90 years in 1990) Printed by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 6. Scope of Patent Application ~ 1 A method of rolling a metal sheet without the need for pickling the heat-treated metal sheet before cold rolling, comprising: providing a heat-treated metal sheet covered with a hard crust; stretching the metal sheet under tension to rupture and flatten the hard crust The metal sheet; sandblasting each surface of the stretched metal sheet with sandblasted particles to remove crust and provide a surface with a predetermined roughness; by at least two adjacent to each surface of the salty metal sheet, the opposite Rotate the cleaning brush in the direction to remove the residual crust;: polish each cleaned surface by at least one polishing brush to further reduce the roughness by 1.Θ — and reduce the metal sheet by ri $ Thick cold-rolled without the need for pickling before reducing cold-rolling. 2. The method of claim 1 wherein the f step of stretching the metal sheet comprises stretching the metal sheet by at least about 1%. ^ 3. The method according to item 2 of the scope of patent application, wherein the step of stretching the metal sheet includes stretching the metal sheet to 2 to 7%. 4. The method according to item 1 of the scope of patent application, wherein the reduced thickness cold-rolled metal sheet has a roughness of less than 0.4 micrometers Ra. 5. The method according to item 4 of the scope of patent application, wherein the reduced-thickness cold-rolled metal sheet has a roughness of less than 0.3 micrometers ra. 6 · The method according to item 丨 of the scope of patent application, wherein the at least two clean paper sizes are applicable to Chinese national standard specifications (2f〇X 297 public love) * — --------- installation ---- ---- Order --------- (Please read the notes on the back before filling this page) ^ 7235 A8 B8 6. Scope of patent application The printing of the consumer cooperative of employees of the Intellectual Property Bureau of the Ministry of Economic Affairs includes at least three cleaning brushes adjacent to the surface of each metal sheet. 7. The method according to the scope of patent application, wherein the cleaning brushes have a majority of bristles that are tightly packed to a surface density greater than 12%. 8. The method according to claim 7 of the patent scope, wherein the bristles are steel wire bristles having a diameter of 0.13 to 0.25 mm. 9. The method according to item j of the patent application range, wherein the metal sheet has a surface roughness of less than 2.0 micrometers Ra before the thickness reduction and cold rolling. 10. The method according to item 9 of the scope of patent application, wherein the metal sheet has a surface roughness of not more than 10 micrometers & 11. The method according to item i of the patent application range, wherein at least 95% of the sandblasted particles have a particle size of at least 0 mm. 12. The method according to item 1 of the scope of patent application, wherein no more than 5% of the sandblasted particles have a particle size greater than 0.05 mm. 13. The method of claim 1 in the scope of the patent application, wherein at least 45 to 55% of the sandblasted particles have a particle size of 0.2 to 0.3 mm. 14 · If the scope of patent application is the first! The method of item, wherein the surface cleaned by the brushes has a roughness of less than 3.6 microns Ra. 15. The method according to item 4 of the scope of patent application, wherein the surface cleaned by the brushes has a roughness of not more than 3.0 microns Ra. 16. The method according to item 1 of the patent application scope, wherein the metal sheet is subjected to cold rolling with a thickness reduction of at least 30%. 17. For the method of applying for item 1 of the patent scope, in which the thickness is reduced and the metal is dried -2- This paper rule iT is applicable to China National Standard (CNS) A4 (210 X 297 mm) -------- -^ -------- Order --------- (Please read the note on the back? Matters before filling out this page) 527235 A8B8C8D8 The Intellectual Property Bureau of the Ministry of Economic Affairs employee consumer cooperative prints the patent application The range piece has a flatness of not more than 201 units. 18. The method of claim 1 in which the metal sheet is stainless steel. 19. A method for manufacturing a cold-rolled metal sheet from a heat-treated metal sheet without the need for pickling the heat-treated metal sheet before cold rolling, comprising: providing a hard-coated heat-treated metal sheet; stretching the metal under tension At least 1% of the sheet to rupture the crust and flatten the metal sheet; spray blast on each surface of the stretched metal sheet to remove the crust; clean with at least two cleaning brushes that rotate in opposite directions adjacent to the surface Each surface to remove any remaining hard skin; the cleaning brushes have bristles with a diameter of 0. 13 to 0. 5 cm; each cleaning surface is polished with at least one polishing brush so that each surface of the metal sheet has less than 1 · The roughness of 5 micrometers R a; and subjecting the metal sheet to thickness reduction cold rolling without pickling before thickness reduction and cold rolling ', so each surface has a roughness of less than 0.4 micrometers R a. 2〇 · —A method for manufacturing cold-rolled metal sheet by using heat-treated metal sheet without the need of pickling the heat-treated metal sheet before cold rolling, comprising: providing a hard-coated heat-treated metal sheet; stretching with tension The metal sheet should be at least 1% to rupture the crust and flatten the metal sheet;-3- This paper size applies to China National Standard (CNS) A4 (21〇X 297 public love) • Installation (please read the note on the back first) Please fill in this page for more details) Order --------- 527235 A8 B8 C8 D8 Printed by the Consumers' Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 6. Scope of application for patents Remove crusts; clean each surface with at least two cleaning brushes that rotate in opposite directions adjacent to the surface to remove any remaining crusts; the cleaning brush has a surface density greater than 12% and has a straight. Pinch to 0. 1 3 ~ 0 · 5cm wire bristles. Use at least one polishing brush to polish each cleaned surface so that each surface of the metal sheet has a roughness of not greater than 1.5 micrometers Ra; and subject the metal sheet to cold rolling without reducing the thickness before cold rolling Therefore, each surface has a roughness of Ra not greater than 0.3 micrometers. ° 21. The method according to item 丨 of the patent application range, wherein the bristles of the at least two cleaning brushes have a tip diameter, and the size of the tip diameter is within the range of the particle diameter in the particle blasting step. 22 · —A method for removing the hard skin of a heat-treated metal sheet without pickling, comprising: providing a hard-covered heat-treated metal sheet; stretching the metal sheet with tension to break the hard skin and flatten the metal Use sandblasting particles to blast each surface of the stretched metal sheet to remove crusts and provide a surface with a predetermined roughness; and clean the surfaces to remove any remaining crusts without pickling The work is performed by at least two brushes which are adjacent to each surface and rotate in opposite directions, whereby the cleaned surface of the metal sheet has a value less than -4-This paper size applies to China National Standard (CNS) A4 specifications ( 21〇x 297mm)! I t 1! (Please read the notes on the back before filling out this page} 527235 A8 B8 C8 Apply for a roughness of 3.6 micrometers R a; t 23. The method according to item 22 of the patent application range, wherein the surface to be cleaned has a roughness of less than 2.5 micrometers Ra; The method of item 2, wherein the bristles of the at least two cleaning brushes have a tip diameter, and the size of the tip diameter is within the range of the particle diameter in the particle blasting step. 25. The method of claim 22, further comprising polishing each cleaned surface with at least one polishing brush to further reduce the roughness to less than 2 microns Ra. 26. The method of claim 22, further comprising polishing each surface to be cleaned with at least one polishing brush to further reduce the degree of coarseness to less than 1 micrometer Ra. (Please read the precautions on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm 1 ^ '----- ---