JPH0679338A - Method and line of devices for processing belt-like metallic body - Google Patents

Abstract

PURPOSE:To obtain a continuous processing line capable of high efficiency by grinding the surface layer part of a belt-like metallic body with abrasive grain contained extra high pressure water and conditioning the ground surface. CONSTITUTION:Extra high pressure water injection devices 9, 10 to heavily grind scales and flaws on the front and rear sides of the belt-like metallic body 2 are provided. The front and rear sides of the belt-like metallic body 2 are ground by nozzles 9a, 10a infecting abrasive grain Nos.40-400 with extra high pressure water. Hereafter, plural stages of stands composed of a pair of an elastic grindstone 12a and a press roll 12b are arranged and both front and rear sides of the belt-like metallic body are conditioned and adjusted. The elastic grindstone roll is a roll-shaped grinding wheel having some elasticity easy to be accustomed to the plate shape to be selected from abrasive grain Nos. 80-600.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a strip-shaped metal body,
When removing surface scales and surface flaws generated in the hot rolling process and thin cast continuous casting process, improve the surface quality of the strip-shaped metal body, pickling treatment, and omit the surface flaw removal process on another line. The present invention relates to a possible method for treating a strip-shaped metal body and a series of treatment devices. In the present specification, the band-shaped metal body means a hot-rolled sheet (band) produced by a usual method from stainless steel, ordinary steel, titanium and its alloys, high alloys, etc.
Alternatively, it refers to a coil, a plate (band) manufactured by continuous casting to a thin wall, or a coil wound up.

[0002]

2. Description of the Related Art In a manufacturing process of a strip-shaped metal body, an oxide scale or a surface flaw is generated on the surface of the strip-shaped metal body due to heating of the slab and subsequent hot rolling or continuous casting of thin slabs. And a process for finishing the surface is required. Conventionally, these methods include shot blasting in which a steel ball having a diameter of 0.2 to 0.6 mm is projected on the surface of a strip-shaped metal body to perform surface layer cleaning to cause cracks and peeling of the scale, and then the nitrofluoride. Descale by pickling with acid, sulfuric acid, hydrochloric acid, etc., and then perform cold rolling to correct the shape of the strip metal body, and then remove the surface flaws of the strip metal body by belt grinding on another line. It was regarded as a typical method.

However, in this conventional process, the pickling process is a continuous line with the annealing process, and the grinding line and the rolling line or the dummy plate (leader) welding line are arranged separately, so that the strip metal body In order to remove the oxide scale and surface defects, it is necessary to pass 2 to 4 lines, and there is a problem that the efficiency is extremely poor. The annealing pickling line is inefficient because descaling is performed by pickling, and there are various problems from the viewpoint of productivity, cost and labor saving such as generation of a large amount of waste liquid accompanying pickling. . On the other hand, in order to uniformly remove surface flaws by belt grinding in the strip width direction, it is necessary to flatten the shape of the coil by cold working.However, this straightening work may be performed using a normal cold rolling mill. For that reason, in addition to the original gauge down (thickness reduction) work, an additional shape correction work has to be performed, so that there is a problem that not only the efficiency is improved but also the cost is increased. Furthermore, in the grinding line, the method of grinding the surface of the strip-shaped metal body with a rotating endless belt is the main method, but this method requires a low belt passing speed and a short belt life, requiring frequent belt replacement. The sex is bad. Moreover, there is a problem that uniform grinding cannot be performed unless the plate shape before grinding is flat.

Therefore, for the purpose of improving the efficiency of descaling and improving the surface quality of the hot-rolled steel strip, a plurality of pickling treatment steps are provided after the pretreatment step of the tension leveler, and the plurality of pickling treatment steps are performed. Japanese Unexamined Patent Publication (Kokai) No. 59-41482 discloses a descaling line in which a grinding process for removing mainly metal residue and smut is combined. However, although the surface quality of the steel strip is improved to some extent in the descaling line, its effect is limited, and since a large amount of descaling is performed by pickling treatment, a considerably large-scale pickling treatment facility is required. Therefore, the initial investment is large, and it is necessary to treat a large amount of waste liquid accompanying the large-scale pickling. Further, since the grinding process provided between each pickling treatment process is not for actively removing the surface flaws of the steel strip, the steel strip passed through the descaling line is used for removing the surface flaws. The problem arises that the plate has to be passed to another grinding line.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and improves the surface quality of the strip-shaped metal body when removing the surface scale and surface flaws of the strip-shaped metal body. Mechanical descaling and surface conditioning, which can simplify the pickling process and surface flaw removal process, improve the efficiency of the processing work and reduce the manufacturing cost and pollution control by simplifying the acid and waste liquid processing. It is an object of the present invention to provide a method for treating a strip-shaped metal body and a row of treatment devices that can reduce the investment of the metal and improve the working environment, and further, by performing continuous treatment, can eliminate the scratching work in another line.

[0006]

The present invention has been completed as a result of various studies on mechanical descaling and surface conditioning methods and combinations of the methods in order to achieve this object. And in the treatment line for removing flaws, the surface layer portion of the belt-shaped metal body having a scale on the surface is ground with ultra-high pressure water containing abrasive grains, and then the grinding surface is conditioned by mechanical means, The main point is to apply subsequent conditioning accordingly. In the present invention, the size of the abrasive grains contained in the ultrahigh pressure water is # 40 to #.
The range of 400 is preferable, and the conditioning is preferably performed by arranging a stand in which an elastic grindstone roll and a pressing roll facing each other are paired. At this time, the abrasive grain count of the elastic grindstone can be selected from the range of # 80 to # 600. The grinding treatment with ultra-high pressure water containing abrasive grains may be performed in multiple stages.

The conditioning performed after the conditioning by mechanical means is blasting with high-pressure water, and the projection pressure used for this is 100 kgf / cm ^2.
It is preferable to carry out the following, and it is preferable to perform the fusing treatment by light pickling, and in this case, the fusing amount is preferably 0.1 to 30 μm.

In the present invention, as a pretreatment, trimming or grinding treatment of the edge of the metal strip is performed, and then, if necessary, heating and cooling treatments for modifying the surface scale to cause cracks or peeling are performed. Good. Further, depending on the band-shaped metal body, connecting a leader and continuously threading is also included.

[0009]

The method for treating a strip-shaped metal body according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic explanatory view showing one embodiment of a process line for carrying out the method of the present invention. In the figure, 1 is a pay-off reel for rewinding and feeding a strip-shaped metal body, 2 is a strip-shaped metal body that is hot-rolled or is continuously cast into a thin cast piece, and 3 is a dummy plate for the strip-shaped metal body (hereinafter referred to as a leader) ) Welding or welding between leaders, for example, a submerged arc welding machine, a TIG welding machine, a plasma welding machine, a spot welding machine, etc. are used. 4 is a trimmer that cuts and removes edge flaws and hot cracks that occur in the strip-shaped metal body during hot rolling or continuous casting of thin slabs, and 5 is a grinder that removes relatively small of these flaws and cracks. It is an edge grinder for doing. Reference numeral 6 denotes a heating furnace which is installed if necessary to heat the strip-shaped metal body, and a heating furnace for burning heavy oil or gas is usually used, but an electric heating furnace such as induction heating or direct current heating can also be used. Good. Reference numeral 7 is a cooling zone for cooling the strip-shaped metal body after heating, such as gas cooling, spray cooling, water spray cooling, roll cooling and the like. Each of the above devices is a preprocessing unit in the present invention, and may be arranged as necessary.

Reference numeral 8 is a leveler for bending or pulling the strip-shaped metal body. Reference numerals 9 and 10 are ultra-high pressure water jetting devices which grind away the scale of the strip-shaped metal body 1 and perform heavy grinding to remove surface flaws, 9 is the front side of the metal body, and 10 is the back side. , And nozzles 9a and 10a for injecting abrasive grains together with ultra-high pressure water. Reference numeral 11 is a bridle roll for applying a tension necessary for grinding the strip-shaped metal body.

Reference numeral 12 denotes an in-line grinding device for conditioning the front and back surfaces of the strip metal body. For example, the elastic grindstone roll 12a and the press roll 12b are provided with a plurality of pairs of stands, and the strip metal is heavily ground. Adjust the front and back sides of your body so that they are smooth. The elastic whetstone roll referred to here is a roll-shaped whetstone having a certain degree of elasticity in order to easily fit to the shape of the plate, for example, a roll formed by laminating discs coated with abrasive grains ( There are a laminated type), a type in which flap wheels are laminated and formed into a roll shape (flap type), and a nylon resin containing abrasive grains integrally formed in a roll shape (integrated type), and the like, and any of these can be adopted. The arrangement of the stand is not particularly limited, but a laminated elastic grindstone roll is placed in the front stage, and the abrasive grain count is large on the final stand side, for example, # 2.
It is preferable to use an elastic whetstone roll of 40 or more.

A cleaning device 13 is installed after the grinding device and performs degreasing, dust removal, and the like. For example, a brush roll 13
a and the press roll 13b are arranged in a plurality of stands, respectively, or a pair of brush rolls are provided so that the front and back surfaces of the strip-shaped metal body face each other. This brush roll includes, for example, a roll made of a brush made of nylon fiber containing abrasive grains. Further hot water spray 13c
Is placed after the degreasing device.

Reference numeral 14 denotes a light pickling apparatus, which performs pickling treatment for adjusting the amount of surface ablation to 0.1 to 30 μm in order to remove burrs and the like generated during the heavy grinding. Reference numeral 15 is a cleaning device, for example, a brush roll 15a
The pressing roll 15b and the pressing roll 15b form a pair of stands, or brush rolls are provided so that the front and back surfaces of the strip-shaped metal body face each other. Further, the hot water sprayer 15c is arranged after the degreasing device. Reference numeral 16 is a tension reel for winding the strip-shaped metal body.

In the processing line having such a structure, the band-shaped metal body, which has been appropriately pretreated, is subjected to heavy grinding while passing through an ultra-high pressure water jet device. Generally, it is hot-rolled or annealed in the subsequent steps. Since the thickness of the scale and the depth of surface flaws that occur in continuous casting of thin cast slabs and thin slabs are at least about 5 to 10 μm, it is necessary to grind at least 10 μm in order to remove the scale and surface flaws. It is desirable to exceed 20 μm for grinding. The projection pressure for that is 1000 kgf / cm ² or more, and the grain size of the abrasive particles jetted with the ultra-high pressure water is # 40.
It is preferably in the range of to # 400. That is, if the abrasive grain count is less than # 40, the load of smoothing in the post-process is increased, and if it exceeds # 400, the grinding efficiency is deteriorated. By mixing such abrasive grains in the ultra-high pressure jet water, the grinding efficiency is extremely improved. The polishing treatment with ultra-high pressure water containing abrasive grains enables uniform descaling and flaw removal regardless of the shape and crown of the plate. On the other hand, in this grinding process, it is preferable to provide a plurality of nozzles to improve the life and efficiency of the nozzles, and to carry out a plurality of steps of cleaning.
Further, in this case, in order to reduce the load of mechanical conditioning, the abrasive grain count may be sequentially increased. The surface roughness after heavy grinding has a deep grinding mark such as a scratch when Rmax exceeds 50 μm, and in order to sufficiently remove this, the load of the surface conditioning in the subsequent step increases. Therefore, it is desirable to set Rmax ≦ 50 μm.

The strip-shaped metal body is passed through the leveler 8 to correct the shape of the plate for facilitating uniform grinding and polishing, and to correct the bending and burrs of the ears. Conditioning device 1
In 2, the front and back surfaces of the heavily ground strip-shaped metal body are polished by the elastic whetstone roll 12a to smooth the surface. The abrasive grain count of the elastic grindstone roll may be selected from the range of # 80 to # 600. That is, if it is less than # 80, the grain is too coarse as a smoothing agent, and even if it is cold-rolled later, the surface of the product has grinds and irregularities, and good surface quality cannot be obtained, and if it exceeds # 600, descaling and flaw removal are performed. This is because it is not possible to sufficiently smooth the grain and remove the caught abrasive grains. With this conditioning, it is preferable to arrange a stand having elastic grindstone rolls on each surface of the strip-shaped metal body in a plurality of stages, thereby reducing the roll load per pass, extending the roll life, and further improving the grinding efficiency. It is possible to improve. At this time, it is preferable to set the whetstone count of the last roll of the elastic whetstone roll to # 240 or more,
This makes it easy to build the surface by cold rolling. In addition, the abrasive grain count of the final pass roll is 3 or more passes #
By setting it to 400 or more, it is possible to suppress the occurrence of burrs during grinding, so that even if direct cold rolling annealing is performed thereafter, good surface quality can be obtained.

Thereafter, the strip-shaped metal body is passed through a degreasing / cleaning device to remove oil, metal residue, scale powder, etc. adhering to the surface, and if necessary, conditioning with only high-pressure water, and / Or condition by light pickling treatment. Conditioning with only high-pressure water can be carried out to remove burrs formed during grinding, and a projection pressure for that purpose is less than 100 kgf / cm ² and no effect is expected, so it is preferable to make it more than that. . Lightly ablated on a strip of metal by light pickling,
Burrs formed during grinding are removed and smoothing and blurring are performed. The reason why the amount of fusing is within the range of 0.1 to 30 μm is that burrs cannot be sufficiently removed if the amount is less than 0.1 μm, and if it exceeds 30 μm, the surface pit-like irregularities in the etch pit become severe, and the cold rolling thereafter is performed. This is because it becomes difficult to build in. By such pickling treatment,
The sharp ground lines are not rounded, the surface profile is improved, and the surface quality after cold rolling is further improved. For pickling, it is desirable to use sulfuric acid, nitric acid, and nitric hydrofluoric acid individually or in a plurality of treatments depending on the target material. You may perform electrolytic pickling using these liquids as needed. After pickling, the pickling solution is washed. Which of high-pressure water and light pickling is to be performed may be appropriately selected depending on the material of the material to be treated and the treatment conditions. After the above processing, it is wound on a tension reel.

As described above, in the present invention, the treatment is not performed in a separate line like the conventional heavy grinding, but is performed in-line, and the equipment is made compact along with the pickling treatment and the initial investment is reduced, and the cost is low. You can now perform descaling and flaw removal. Examples of the present invention will be described below.

[0018]

[Example] In accordance with a continuous process by the processing device row shown in FIG. 1, a heavy metal grinding process in which a belt-shaped metal body is sprayed with ultra-high pressure water and abrasive grains under the conditions shown in Table 1, conditioning using an elastic whetstone roll and necessary The surface quality after treatment and the quality of the cold rolled annealed product were investigated and evaluated, and the results are also shown in Table 1. The conditions and methods for heat treatment and pretreatment before in-line grinding are also described. In this table, the amount of polishing and the amount of grinding were measured before and after the treatment, and the removed thickness was calculated from the specific gravity. The evaluation of descaling and flaw removal was as follows. ◯: No scale remains and no surface flaws. Δ: No scale remains, but surface flaws remain. X: Scale and surface flaws remain. In addition, the surface quality of cold-rolled and annealed products depends on the degree of gloss.
And 5 ranks A to D were evaluated, and B rank or higher was regarded as the first grade. The conditions for cold rolling annealing were normal conditions. As is clear from this table, the evaluation results of the strip-shaped metal bodies according to the method of the present invention are all good, no scale residue and surface flaws are observed, and the product after cold rolling annealing also has good surface properties. At the same time, the average life of the elastic grindstone roll is improved by making the roll into multiple passes.

[0019]

[Table 1]

[0020]

[Table 2]

[0021]

[Table 3]

[0022]

As is apparent from the above, in the present invention, when removing the surface scale and surface flaws, the in-line grinding and conditioning treatments are performed in-line, and the pickling treatment is continuously performed to treat the strip-shaped metal body. To improve the surface quality of the strip-shaped metal body and to simplify the descaling and surface flaw removal process and pickling process to further improve efficiency, and reduce the production cost and pollution control by simplifying the acid and waste liquid treatment. Cost can be reduced and working environment can be improved. Also, it became possible to omit the flaw removal on another line by continuous processing.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment for carrying out the present invention.

[Explanation of symbols]

 1 Payoff reel 2 Band metal 3 Welding machine 4 Trimmer 5 Edge grinder 6 Heating furnace 7 Cooling zone 8 Leveler 9 Ultra high pressure water injection device (front side) 9a Injection nozzle 10 Ultra high pressure water injection device (back side) 10a Injection nozzle 11 Bridle roll 12 Conditioning (In-line Grinding) Device 12a Elastic Whetstone Roll 12b Pressing Roll 13 Degreasing Cleaning Device 13a Brush Roll 13b Pressing Roll 13c Spray 14 Light Pickling Device 15 Cleaning Device 15a Brush Roll 15b Pressing Roll 15c Spray 16 Tension Reel

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[Procedure amendment]

[Submission date] June 29, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 11

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

The conditioning performed after the conditioning by mechanical means is blasting with high-pressure water, and the projection pressure used for this is 100 kgf / cm ^2.
It is preferable to carry out the above, and it is preferable to carry out the fusing treatment by light pickling, and in this case, the fusing amount is preferably 0.1 to 30 μm.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

In the present invention, as a pretreatment, trimming or grinding treatment of the edge of the strip-shaped metal body is performed, and then the surface scale is modified and cracked if necessary.
Alternatively, heat treatment or cooling treatment that causes peeling may be performed.
Yes . Further, depending on the band-shaped metal body, connecting a leader and continuously threading is also included.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

The method for treating a strip-shaped metal body according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic explanatory view showing one embodiment of a process line for carrying out the method of the present invention. In the figure, 1 is the rewinding of the strip metal body.
Payoff reels to be supplied as 2 are for hot-rolling or continuously casting thin-walled slabs for strip-shaped metal bodies, 3 for welding dummy plates (hereinafter referred to as leaders) to the strip-shaped metal bodies and welding between leaders. , A submerged arc welder, a TIG welder, a plasma welder, a spot welder, or the like. 4 is a trimmer that cuts and removes edge flaws and hot cracks that occur in the strip-shaped metal body during hot rolling or continuous casting of thin slabs, and 5 is a grinder that removes relatively small of these flaws and cracks. It is an edge grinder for doing. Reference numeral 6 denotes a heating furnace which is installed if necessary to heat the strip-shaped metal body, and a heating furnace for burning heavy oil or gas is usually used, but an electric heating furnace such as induction heating or direct current heating can also be used. Good. Reference numeral 7 is a cooling zone for cooling the strip-shaped metal body after heating, such as gas cooling, spray cooling, water spray cooling, roll cooling and the like. Each of the above devices is a preprocessing unit in the present invention, and may be arranged as necessary.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Reference numeral 12 denotes an in-line grinding apparatus for conditioning the front and back surfaces of the strip-shaped metal body . For example, the elastic grindstone roll 12a and the pressing roll 12b each have a plurality of stands arranged in pairs, and the heavy-grinded strip-shaped metal body is arranged. Adjust both the front and back sides of the so that they are smooth. The elastic whetstone roll referred to here is a roll-shaped whetstone having a certain degree of elasticity in order to easily fit to the shape of the plate, for example, a roll formed by laminating discs coated with abrasive grains ( There are a laminated type), a type in which flap wheels are laminated and formed into a roll shape (flap type), and a nylon resin containing abrasive grains integrally formed in a roll shape (integrated type), and the like, and any of these can be adopted. The arrangement of the stand is not particularly limited, but a laminated elastic grindstone roll is placed in the front stage, and the abrasive grain count is large on the final stand side, for example, # 2.
It is preferable to use an elastic whetstone roll of 40 or more.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Thereafter, the strip-shaped metal body is passed through a degreasing / cleaning device to remove oil, metal residue, scale powder, etc. adhering to the surface, and if necessary, conditioning with only high-pressure water, and / Or condition by light pickling treatment. Conditioning with only high-pressure water can be carried out to remove burrs formed during grinding, and a projection pressure for that is not sufficient if less than 100 kgf / cm ² and no effect is expected. . The metal strip is lightly ablated by a light pickling process to remove burrs formed during grinding and smooth the surface.
Blurring is applied. The reason why the amount of fusing is within the range of 0.1 to 30 μm is that burrs cannot be sufficiently removed if the amount is less than 0.1 μm, and if it exceeds 30 μm, the surface pit-like irregularities in the etch pit become severe, and the cold rolling thereafter is performed. This is because it becomes difficult to build in. By such pickling treatment, sharp grinds are not rounded, the surface profile is improved, and the surface quality after cold rolling is further improved. For pickling, it is desirable to use sulfuric acid, nitric acid, and nitric hydrofluoric acid individually or in plural treatments, depending on the target material. You may perform electrolytic pickling using these liquids as needed.
After pickling, the pickling solution is washed. Which of high-pressure water and light pickling is to be performed may be appropriately selected depending on the material of the material to be treated and the treatment conditions. After the above processing, it is wound on a tension reel.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Yoshio Uzuki 1618 Ida, Nakahara-ku, Kawasaki-shi, Kanagawa Inside Advanced Technology Research Laboratories, Nippon Steel Corporation (72) Yoshifumi Takai, 3434 Shimada, Hikari City, Yamaguchi Prefecture Nippon Steel Co., Ltd.Hikari Steel Works (72) Inventor Toshihiko Uchida 3434 Shimada, Hikari City, Yamaguchi Prefecture Nippon Steel Co., Ltd. Hikari Steel Works (72) Inventor Kazumi Totoku Tobata-ku, Tobata-ku, Kitakyushu, Fukuoka Prefecture No. 1-1 Machi Nippon Steel Co., Ltd. Yawata Works (72) Inventor Hiroyuki Matsumura 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory (72) Inventor Kei Tsujida History 3-1-1 Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries Ltd. Kobe factory (72) Inventor Yoshikazu Ikemoto Higashi-kawasaki, Chuo-ku, Kobe-shi, Hyogo 3-1-1, Kawasaki Heavy Industries, Ltd. Kobe factory (72) Inventor Yoshio Arai 2-4-1, Hamamatsucho, Minato-ku, Tokyo Kawasaki Heavy Industries, Ltd. Tokyo Head Office

Claims (13)

[Claims] 1. In the treatment of a strip-shaped metal body, the surface layer portion of the strip-shaped metal body having a scale on the surface is ground with ultra-high pressure water containing abrasive grains, and then the ground surface is conditioned by mechanical means. A method for treating a strip-shaped metal body. 2. In the treatment of a strip-shaped metal body, the surface layer portion of the strip-shaped metal body having a scale on its surface is ground with ultrahigh pressure water containing abrasive grains, and then the ground surface is conditioned by mechanical means. A method for treating a strip-shaped metal body, which further comprises conditioning. 3. The size of abrasive grains contained in ultra high pressure water is # 40 to #.
The method for treating a strip-shaped metal body according to claim 1 or 2, which is in the range of 400. 4. The method for treating a strip-shaped metal body according to claim 1, wherein a stand in which a pressing roll opposed to the elastic grindstone roll is paired is arranged to perform mechanical conditioning. 5. The method for treating a strip-shaped metal body according to claim 2, wherein the conditioning performed after the conditioning by the mechanical means is polishing with high-pressure water. 6. The method for treating a strip-shaped metal body according to claim 2, wherein the projection pressure in conditioning with high-pressure water is 100 kgf / cm ² or more. 7. The method for treating a strip-shaped metal body according to claim 2, wherein the conditioning performed after the conditioning by mechanical means is a fusing treatment by light pickling. 8. The method for treating a strip-shaped metal body according to claim 2, wherein the amount of ablation in the light pickling conditioning is 0.1 μm or more. 9. The method for treating a strip-shaped metal body according to claim 2, wherein the conditioning performed after the conditioning by mechanical means is a scouring treatment with high-pressure water, followed by a fusing treatment by light pickling. 10. The strip-shaped metal body according to claim 1, wherein the surface layer portion of the strip-shaped metal body having a scale on its surface is ground in ultrahigh pressure water containing abrasive grains in a plurality of steps. Processing method. 11. A band-shaped metal body processing device array comprising a high-pressure water spraying device, a bridle roll, an in-line grinding device, and a degreasing device, which are continuously arranged in the band-shaped metal body processing device array. 12. As a pretreatment device for an apparatus row according to claim 11, at least one of a welding device, a trimmer device, an edge grinding device, a heat treatment device, and a shape correction device is provided. A strip of metal processing equipment. 13. A strip-shaped metal body treating apparatus row, comprising a light pickling apparatus and a washing apparatus as the post-processing apparatus according to claim 11 and claim 12.