JPH04182020A - Method for descaling stainless steel sheet - Google Patents
Method for descaling stainless steel sheetInfo
- Publication number
- JPH04182020A JPH04182020A JP30620390A JP30620390A JPH04182020A JP H04182020 A JPH04182020 A JP H04182020A JP 30620390 A JP30620390 A JP 30620390A JP 30620390 A JP30620390 A JP 30620390A JP H04182020 A JPH04182020 A JP H04182020A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- scale
- descaling
- steel plate
- nitric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 50
- 239000010935 stainless steel Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 19
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 17
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 15
- 230000007935 neutral effect Effects 0.000 claims abstract description 10
- 239000012266 salt solution Substances 0.000 claims abstract description 3
- 238000007654 immersion Methods 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 abstract description 11
- 230000001678 irradiating effect Effects 0.000 abstract description 8
- 238000011282 treatment Methods 0.000 abstract description 8
- 239000000243 solution Substances 0.000 abstract description 7
- 238000005096 rolling process Methods 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 abstract 2
- 238000001704 evaporation Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 description 18
- 238000005406 washing Methods 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 230000010355 oscillation Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 238000002161 passivation Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910004077 HF-HNO3 Inorganic materials 0.000 description 2
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 229910000423 chromium oxide Inorganic materials 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 210000003323 beak Anatomy 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Inorganic materials [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- ing And Chemical Polishing (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分舒〉
本発明は、焼鈍時に発生したステンレス鋼板表面のスケ
ール層を効率良く除去するステンレス鋼板の脱スケール
方法に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to a method for descaling a stainless steel plate, which efficiently removes a scale layer on the surface of a stainless steel plate generated during annealing.
〈従来の技術〉
ステンレス鋼を冷却圧延して、圧延硬化を除去するため
に焼鈍を行う際に、該ステンレス鋼の表面には酸化物ス
ケール（例えばクロム酸化物）の層が生成する。ここで
生成した酸化物スケール層は硬度が高く、機械加工時に
問題を生じるため、除去する必要がある。<Prior Art> When stainless steel is cold rolled and annealed to remove roll hardening, a layer of oxide scale (for example, chromium oxide) is formed on the surface of the stainless steel. The oxide scale layer produced here has high hardness and causes problems during machining, so it must be removed.
従来におけろこのスケール層を除去する方法としては、
例えば塩浴法、中性塩電解法等が挙げられる。Conventionally, the method for removing this scale layer is as follows:
Examples include a salt bath method, a neutral salt electrolysis method, and the like.
この従来の塩浴法の一例を第５図に示す。An example of this conventional salt bath method is shown in FIG.
同図に示すように、ステンレス鋼板１００の搬送方向上
流鍔間から塩浴槽１０１．硫酸又（よ硝酸の電解１１１
１０２ 、硝フッ酸浸漬槽１０３とが、各々水洗層１０
４ａ、１０４ｂ、１０４ｃを介して順に配設されてし）
る。そして、搬送すした表面ニスケールを有するステン
レス鋼板Ｚｏｏば、先ず、４００〜５００℃に加熱され
溶融塩となったアルカリ （ＮａＯＨ，ＮａＮ０３）が
保持されている塩浴槽１０１に入り、ここで表面のスケ
ールにアルカリが付着し、スケール中の硬く除去し無い
クロム酸化物ζよ４００〜５００℃の温度のアルカリと
反応して、除去し易い可溶性の塩になる。As shown in the figure, a salt bath 101. Electrolysis of sulfuric acid or nitric acid 111
102 and nitric-hydrofluoric acid immersion tank 103, respectively, the water washing layer 10
4a, 104b, and 104c)
Ru. Then, the transported stainless steel plate Zoo having surface scales first enters a salt bath 101 in which alkali (NaOH, NaN03) heated to 400 to 500°C and turned into molten salt is held, where the surface scales are removed. The alkali adheres to the scale, and the hard, unremovable chromium oxide ζ in the scale reacts with the alkali at a temperature of 400 to 500°C to become a soluble salt that is easy to remove.
次に、ステンレス鋼板１００を水洗槽１０４ａて水洗し
た後、硫酸又は硝酸の電解槽１０２中で電気分解し、ス
ケール除去を行う。この酸液中で電解することは、スケ
ールを溶解することと、電解による発生気泡による機械
的剥離により１スケールをステンレス鋼板１００の表面
より脱離させる作用をもたらすものである。Next, the stainless steel plate 100 is washed with water in a washing tank 104a, and then electrolyzed in a sulfuric acid or nitric acid electrolytic tank 102 to remove scale. Electrolysis in this acid solution has the effect of dissolving the scale and detaching one scale from the surface of the stainless steel plate 100 by mechanical peeling by bubbles generated by electrolysis.
その後、水洗層１０４ｂで水洗し、硝フッｍ液（ＨＦ・
ＨＮへ水溶液）の浸漬嘴１０３１こ浸漬し、仕上げのス
ケール溶解と鋼板１００の表面の不動態化処理を行った
後、水洗槽１０４ｃで水洗し、一連の脱スケール処理を
終了する。After that, it is washed with water in the water washing layer 104b, and the
After the dipping beak 1031 is immersed in HN (aqueous solution) to perform finishing scale dissolution and passivation treatment on the surface of the steel plate 100, the steel plate 100 is rinsed with water in a water washing tank 104c to complete a series of descaling treatments.
次に、一方の中性塩電解法の一例を第６図に示す。同図
に示すように、ステンレス鋼板１００の搬送方向上流鍔
間から下流側但）へ向って、中性塩電解槽１１０．水洗
槽１１１ ａ。Next, one example of the neutral salt electrolysis method is shown in FIG. As shown in the figure, a neutral salt electrolytic cell 110. Washing tank 111a.
硝フッ酸の浸漬槽１１２及び水洗槽１１１ｂが順に配設
されており、該ステンレス鋼板１００は先ず中性塩電解
槽１１０に入り、硫酸ナトリウムの水溶液中で電解され
、表面のスケールが溶解、除去される。次に、水洗槽１
１１ａで水洗後、硝’７ツ酸液（ＨＦ −ＨＮＯ３水溶
液）の浸漬槽１１２に浸漬し、仕上げの溶解と表面の不
動態化処理を行った後水洗槽１１１ｂで水洗し、一連の
脱スケール処理を終了する。A dipping tank 112 for nitric-hydrofluoric acid and a washing tank 111b are arranged in this order, and the stainless steel plate 100 first enters a neutral salt electrolysis tank 110 and is electrolyzed in an aqueous solution of sodium sulfate to dissolve and remove scale on the surface. be done. Next, wash tank 1
After washing with water in step 11a, it is immersed in a dipping tank 112 of a nitric acid solution (HF-HNO3 aqueous solution) to dissolve the finish and passivate the surface, and then rinsed with water in a water washing tank 111b, followed by a series of descaling steps. Finish the process.
以上説明した処理法は、主としてオーステナイＰ系（ｓ
ｔｙｓ ３０４材など）に関する処理であるが、他の
ＳＵＳ ４３０．ＳＵＳ ４１０材などに対しても、酸
の種類を他のものを用いることで、はぼ同様の処理が行
なわれろ。The treatment method explained above is mainly based on austenite P system (s
tys 304), but other SUS 430. Similar treatment can be applied to SUS 410 materials by using other types of acids.
〈発明が解決しようとする課題〉
しかしながら、前述した従来技術に係る塩浴法を用いた
脱スケール法には息下に示すような問題点がある。<Problems to be Solved by the Invention> However, the descaling method using the salt bath method according to the prior art described above has the following problems.
■ 第５図に示すように、塩浴法では、塩浴槽１０１に
おいて、鋼板１００が金属又はセラミックス製の硬いロ
ール１０１ａと接するため、鋼板１００とロール１０１
ａとが接触すると、鋼板１００の表面にキズが発生する
。■ As shown in FIG. 5, in the salt bath method, the steel plate 100 comes into contact with a hard roll 101a made of metal or ceramics in the salt bath 101.
When the steel plate 100 comes into contact with the steel plate 100, scratches occur on the surface of the steel plate 100.
■ このキズ発生はライン速度が早くなるほど起り易く
なるため、ラインの速度が制限される。■ This occurrence of scratches becomes more likely as the line speed increases, so the line speed is limited.
■ また、一方ライン速度が早くなると鋼板１００が持
ち出す塩の量も増え、塩の消費量が増大する。(2) On the other hand, as the line speed increases, the amount of salt taken out by the steel plate 100 also increases, resulting in an increase in the amount of salt consumed.
■ この結果、塩浴法ではライン速度を上げろことがで
きず、生産量を増大することができないという問題があ
る。■ As a result, the salt bath method has the problem that it is not possible to increase the line speed and therefore the production volume cannot be increased.
また一方の中性塩電解法を用いた脱スケール法に【よ、
以下に示すような問題がある。In addition, one method for descaling using neutral salt electrolysis is
There are problems as shown below.
■ 第６図に示すように、中性塩電解槽１１０において
電解に要する時間が長いため、進光方向に互って長い電
解槽が必要となり、しかも内部で使用する電解に必要な
多数の電源設備と多量の電力が必要となり、設備費及び
運転費が大きくなるという問題がある。■ As shown in Figure 6, since the time required for electrolysis in the neutral salt electrolytic cell 110 is long, electrolytic cells that are long in the direction of light propagation are required, and many power supplies are required for electrolysis to be used internally. There is a problem that equipment and a large amount of electric power are required, which increases equipment costs and operating costs.
本発明は以上述べた事情に鑑み、ライン速度の向上を図
り、しかも設備費及び運転費を低減化させ得ろステンレ
ス鋼板の脱スケール方法を提供することを目的とする。In view of the above-mentioned circumstances, it is an object of the present invention to provide a method for descaling stainless steel sheets that can improve line speed and reduce equipment costs and operating costs.
く課題を解決するための手段〉
前記目的を達成する本発明に係る第１のステンレス鋼板
の脱スケール方法は、圧延後ノステンレス鋼板を焼鈍し
た際に該鋼板の表面に生成したスケール層に、レーザー
光を照射して該スケール層を溶融、蒸発させて除去する
ことを特徴とする。Means for Solving the Problems> A first method for descaling a stainless steel plate according to the present invention that achieves the above object includes a scale layer formed on the surface of the steel plate when the stainless steel plate is annealed after rolling. The method is characterized in that the scale layer is removed by irradiating laser light to melt and evaporate it.
本発明に係る第２のステンレス鋼板の脱スケール方法は
、圧延後のステンレス鋼板を焼鈍した際に該鋼板の表面
に生成したスケール層に、レーザー光を照射して該スケ
ール層を溶融、蒸発させて除去した後、硝酸あるいは硝
フッ酸に浸漬することを特徴とする。The second method for descaling a stainless steel sheet according to the present invention is to irradiate a scale layer generated on the surface of a rolled stainless steel sheet when the steel sheet is annealed with laser light to melt and evaporate the scale layer. It is characterized in that it is removed by immersion in nitric acid or nitric-hydrofluoric acid.
本発明に係る第３のステンレスｍ板の脱スケール方法は
、圧延後のステンレス鋼板を焼鈍した際に該鋼板の表面
に生成したスケール層に、レーザー光を照射して該スケ
ール層を溶融、蒸発させて除去した後、硫酸、硝酸又は
中性塩溶液中で電解し、さらに硝酸あるいは硝フッ酸に
浸漬することを特徴とする。The third method for descaling a stainless steel plate according to the present invention is to irradiate a scale layer generated on the surface of a rolled stainless steel plate when the steel plate is annealed with laser light to melt and evaporate the scale layer. After removal, electrolysis is performed in sulfuric acid, nitric acid, or a neutral salt solution, and further immersion in nitric acid or nitric-hydrofluoric acid.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
ここで、本発明でステンレス鋼板表面のスケール層を脱
スケール化するレーザー光とは、同一の波長を持つエネ
ルギーの高い光であり、例えば炭酸ガスレーザー、エキ
ンマレーザーなど公知のレーザー光が挙げられろ。Here, in the present invention, the laser light for descaling the scale layer on the surface of the stainless steel plate is a high-energy light having the same wavelength, and includes known laser lights such as carbon dioxide laser and exhaust laser. reactor.
コルレーザー光を照射してステンレス鋼板の表面に付着
したスケールを溶融、蒸発して除去する概略を第４図に
示す。同図に示すように、レーザー光４１はステンレス
鋼板４２の表面４３に付着した酸化物スケール層４４（
厚さ０．２μｍ）の部分にエネルギーを与え、該酸化物
スケール層４４を瞬間的に溶融、蒸発し除去することと
なる。FIG. 4 shows a schematic diagram of how scale adhering to the surface of a stainless steel plate is melted, evaporated, and removed by irradiation with a laser beam. As shown in the figure, the laser beam 41 emits an oxide scale layer 44 (
Energy is applied to a portion with a thickness of 0.2 μm), and the oxide scale layer 44 is instantaneously melted, evaporated, and removed.
このように、レーザー光の照射は、固体表面のみに作用
する特性が優れており、ステンレス鋼板の脱スケールに
最も適したもので、極めて効率的なスケール除去を可能
とする。As described above, laser light irradiation has the excellent property of acting only on the solid surface, and is most suitable for descaling stainless steel sheets, making it possible to remove scale extremely efficiently.
レーザー光の照射によ゛ろ説スケール試験の結果、０．
５〜ＩＪ／ｄのエネルギーを与えることにより、スケー
ルを除去することが可能である。As a result of a theory scale test using laser light irradiation, 0.
It is possible to remove scale by applying energy of 5 to IJ/d.
このようにレーザー光の照射をステンレス鋼板の脱スケ
ールに適用することにより、短時間の脱スケール化が可
能となり、またエネルギー効率の良好な脱スケールプロ
セスが実現できる。By applying laser light irradiation to descaling a stainless steel plate in this way, descaling can be achieved in a short time, and a descaling process with good energy efficiency can be realized.
また、レーザー光の照射後の脱スケールされたステンレ
ス鋼板は、短時間の酸化浸漬により、脱スケールをさら
に完全に完了させることができ、従来の方法と比べ、設
備の簡略化また短縮化を可能とする。In addition, descaling of stainless steel sheets that have been descaled after irradiation with laser light can be more completely descaled by immersion in oxidation for a short time, making it possible to simplify and shorten the equipment compared to conventional methods. shall be.
次に本発明に係る脱スケール法を説明する。Next, the descaling method according to the present invention will be explained.
本発明の第１の脱スケール方法としては、スケールが付
着しているステンレス鋼板にレーザー光を照射して脱ス
ケール化を図るものである。The first descaling method of the present invention is to irradiate a stainless steel plate with scale on it with laser light to descale it.
本方法では、スケールが付着しているステンレス鋼板に
レーザー光を照射することにより、表面のスケールにレ
ーザー光のエネルギーが集中し、その結果、スケール層
部分のみが溶融し、蒸発する。これにより、鋼板表面の
スケール層はほぼレーザー照射のみで除去可能となる。In this method, by irradiating a stainless steel plate with scale attached with a laser beam, the energy of the laser beam is concentrated on the scale on the surface, and as a result, only the scale layer portion is melted and evaporated. As a result, the scale layer on the surface of the steel plate can be removed almost exclusively by laser irradiation.
尚、レーザー光の照射面積（よ鋼板表面の面積に比べて
広いので鋼板を全幅面に亙って照射するためには、レー
ザー光照射位置を走査して行う必要があるが、照射によ
るスケール除去は、時間的に行なわれるので、脱スケー
ル操作は従来の方法に比べ、極めて短時間で行なわれる
。Note that the irradiation area of the laser beam (as it is larger than the surface area of the steel plate, so in order to irradiate the entire width of the steel plate, it is necessary to scan the laser beam irradiation position, but the scale removal by irradiation Since this is carried out in a timely manner, the descaling operation is carried out in an extremely short time compared to conventional methods.
本発明の第２の脱スケール方法としては、スケールが付
着しているステンレス鋼板にレーザー光を照射した後、
硝酸あるいζま硝フッ酸の水溶液に浸漬することにより
、完全な脱スケール化を図るものである。As the second descaling method of the present invention, after irradiating a stainless steel plate with scale attached with a laser beam,
Complete descaling is achieved by immersing the material in an aqueous solution of nitric acid or ζ-nitric-hydrofluoric acid.
本方法では、上述した第１の脱スケール化を図った後の
鋼板表面のより完全な脱スケール化を図るため、硝酸あ
るいは硝フッ酸水容液の浸漬槽に浸漬させ、スケール除
去の仕上げと不動態化処理とを行うものである。In this method, in order to achieve more complete descaling of the surface of the steel sheet after the first descaling described above, the steel sheet is immersed in a nitric acid or nitric-hydrofluoric acid aqueous solution bath for finishing and descaling. Passivation treatment is performed.
本発明の第３の脱スケール方法としては、スケールが付
着しているステンレス鋼板にレーザー光を照射した後、
硫酸、硝酸または中性基溶液中で電解し、さらに、硝酸
あるいは硝フッ酸の水溶液に浸漬することにより、脱ス
ケール後の表面の仕上り状態をさらに良好とするもので
ある。As the third descaling method of the present invention, after irradiating a stainless steel plate with scale on it with a laser beam,
By electrolyzing in sulfuric acid, nitric acid, or a neutral group solution, and further immersing in an aqueous solution of nitric acid or nitric-hydrofluoric acid, the surface finish after descaling can be further improved.
尚、レーザー光の照射を鋼材のスケール除去に適用した
例として例えば特開昭６１−９５７１８号公報を挙げる
ことができるが、この先行技術では、レーザー照射はス
ケールとその母材とを加熱するためにのみ用いており、
この加熱の結果両者を熱膨張させてスケールの剥離を生
じさせ、その後、例えばショツトブラスト法により、剥
離したスケールを除去することが開示されているのみで
、本発明のように直接レーザー光を照射して溶融。Incidentally, as an example of applying laser light irradiation to scale removal from steel materials, for example, Japanese Patent Application Laid-Open No. 61-95718 can be mentioned, but in this prior art, laser irradiation heats the scale and its base material. It is used only for
As a result of this heating, both are thermally expanded to cause scale exfoliation, and the exfoliated scale is then removed by, for example, shot blasting. and melt.
蒸発させ脱スケール化を図るものではない。It is not intended to evaporate and descale.
すなわち、従来技術の方法を本発明の対象である焼鈍に
より発生したステンレス表面のスケール層の脱スケール
化に適用することは次の点で困難がある。That is, it is difficult to apply the method of the prior art to the descaling of the scale layer on the stainless steel surface generated by annealing, which is the subject of the present invention, due to the following points.
■ ステンレス鋼板の焼鈍時に生成するスケール層ば厚
さが薄く緻密でしかも母材との密着性が強いため、レー
ザーによる加熱による熱膨張で剥離することはない。■ The scale layer formed during annealing of stainless steel sheets is thin and dense, and has strong adhesion to the base material, so it will not peel off due to thermal expansion caused by laser heating.
＠ また、製品として表面の平滑さが要求されるため、
加熱後に施されろショツトブラスト等を使用することも
適切ではない。@ Also, since the product requires a smooth surface,
It is also not appropriate to use shot blasting or the like after heating.
く実 施 例〉
以下、本発明の好適な実施例について図面を参照して説
明する。Embodiments Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
第１図に、本発明に係る第１の脱スケール方法の一実施
例の概略を示す。同方法は、ステンレス鋼板にレーザー
光の照射のみを行って脱スケール化を図るようにしたも
のであり、図面中、１１はステンレス鋼板、１２はレー
ザー光、１３はレーザー発振装置、１４ａは水洗槽を各
々図示する。同図において、表面にスケールの付着した
ステンレス鋼板１１は、上流側（５）より設備に入り、
レーザー発振装置１３からのレーザー光１２の照射を両
面に受け、表面のスケールが溶融、蒸発する結果、スケ
ール除去がなされろ。FIG. 1 schematically shows an embodiment of the first descaling method according to the present invention. This method aims at descaling by only irradiating a stainless steel plate with laser light. In the drawing, 11 is a stainless steel plate, 12 is a laser beam, 13 is a laser oscillation device, and 14a is a washing tank. are each illustrated. In the figure, the stainless steel plate 11 with scale attached to its surface enters the equipment from the upstream side (5).
Both surfaces are irradiated with the laser beam 12 from the laser oscillation device 13, and the scale on the surface is melted and evaporated, thereby removing the scale.
上記レーザー照射において、レーザー光１２の照射範囲
はステンレス鋼板１１の表面積に較べて狭いので、必要
に応じレーザー発振装置を１台あるいは複数台用い、レ
ーザー光１２を操走査してステンレス鋼板１１の全面に
亙ってレーザー光の照射が行なわれろようにしている。In the above laser irradiation, since the irradiation range of the laser beam 12 is narrower than the surface area of the stainless steel plate 11, one or more laser oscillation devices are used as necessary to scan the laser beam 12 over the entire surface of the stainless steel plate 11. Laser light irradiation is made to continue over this period.
上記レーザー光の照射後の脱スケール化が図られたステ
ンレス鋼板１１は、水洗槽１４ａが水洗後、下流６！１
８より設備を出る。The stainless steel plate 11, which has been descaled after being irradiated with the laser beam, is washed in the washing tank 14a, downstream 6!1.
Exit the facility from 8.
第２図に、本発明に係る第２の脱スケール方法の一実施
例の概略を示す。同方法は、ステンレス鋼板にレーザー
光を照射して脱スケール化を図った後、硝フッ酸浸漬槽
に浸漬して脱スケールの仕上げと不動態化処理とを行う
ものである。図面中、１１はステンレス鋼板、１２はレ
ーザー光、１３はレーザー発振装置、１４ａ、１４ｂは
水洗槽、１５は硝フッ酸（ＨＦ−ＨＮＯ３）水溶液１６
を入れた浸漬槽を各々図示する。同図において、表面に
スケールの付着したステンレス鋼板１１は、上流測置よ
り設備に入り、レーザー発振装置１３からのレーザー光
１２の照射を両面に受け、表面のスケールが溶融、蒸発
される結果、スケール除去がなされる。その後、スケー
ル除去された鋼板１１は水洗槽１４ａで水洗し、硝フッ
酸水溶液を入れた浸漬槽１５中に浸漬し、脱スケール化
の仕上げと、不動態化処理とを行い、次いで水洗槽１４
ｂで水洗後、下流側向より設備を出る。FIG. 2 schematically shows an embodiment of the second descaling method according to the present invention. In this method, a stainless steel plate is irradiated with a laser beam to descale it, and then immersed in a nitric-hydrofluoric acid immersion tank to finish descaling and passivate it. In the drawing, 11 is a stainless steel plate, 12 is a laser beam, 13 is a laser oscillation device, 14a, 14b are a washing tank, 15 is a nitric-hydrofluoric acid (HF-HNO3) aqueous solution 16
Each of the immersion baths containing . In the figure, a stainless steel plate 11 with scale attached to its surface enters the equipment from an upstream station, and is irradiated with laser light 12 from a laser oscillation device 13 on both sides, and as a result, the scale on the surface is melted and evaporated. Descaling is done. Thereafter, the steel plate 11 from which the scale has been removed is washed in the washing tank 14a, immersed in the immersion tank 15 containing a nitric-hydrofluoric acid aqueous solution, and subjected to descaling and passivation treatment.
After washing with water in b, exit the equipment from the downstream direction.
第３図に、本発明に係る第３の脱スケール方法の一実施
例の概略を示す。同方法は、ステンレス鋼板にレーザー
光を照射して脱スケール化を図った後、硫酸又は硝酸の
電解槽で電解し、さらに脱スケール化の向上を図った後
、硝フッ酸の浸漬槽に浸漬して脱スケールの仕上げと不
動態化処理を行うものである。FIG. 3 schematically shows an embodiment of the third descaling method according to the present invention. This method involves irradiating a stainless steel plate with laser light to descale it, electrolyzing it in a sulfuric acid or nitric acid electrolytic bath, further improving descaling, and then immersing it in a nitric-hydrofluoric acid dipping bath. This process involves finishing descaling and passivation.
同図中、１１はステンレス鋼板、１２はレーザー光、１
３はレーザー発振装置、１４ａ。In the figure, 11 is a stainless steel plate, 12 is a laser beam, 1
3 is a laser oscillation device, 14a.
１４ｂ、１４ｃば水洗槽、１５（ま硝７ツ酸（ＨＦ −
ＨＮＯ，）水溶液１６を入れた。浸漬槽１７（よＨ２Ｓ
Ｏ４又はＨＮＯ７溶液１８を入れた電解槽を各々図示す
る。同図において、表面にスケールの付着したステンレ
ス鋼板１１は上流側より設備に入り、レーザー発振装置
１３からのレーザー光１２の照射を両面に受け、表面の
スケールが溶融、蒸発されろ結果、スケール除去がなさ
れろ。その後、脱スケール化された鋼板１１は水洗槽１
４ａで水洗し、Ｈ２ＳＯ。14b, 14c are water washing tanks, 15 (or nitric acid (HF -
HNO,) aqueous solution 16 was added. Immersion tank 17 (yoH2S
An electrolytic cell containing an O4 or HNO7 solution 18 is shown, respectively. In the figure, a stainless steel plate 11 with scale attached to its surface enters the equipment from the upstream side, and both sides are irradiated with laser light 12 from a laser oscillation device 13, and the scale on the surface is melted and evaporated, resulting in scale removal. Let it be done. After that, the descaled steel plate 11 is transferred to the washing tank 1.
Wash with water and H2SO.
又はＨＮＯ３水溶？！！１８を入れた電解槽１７中で電
気分解し、さらなるスケール除去を行い、スケールを完
全に除去し、次いで水洗槽１４ｂで水洗した後、ＨＦ−
ＨＮ０体溶液１６を入れた浸漬槽１５で前述した実施例
と同様に処理して、脱スケール化の仕上げと不動態化処
理とを行い、水洗槽１４ｃで水洗後、下流側向より設備
を出ろ。Or HNO3 water soluble? ! ! HF-18 is electrolyzed in the electrolytic bath 17 containing HF-
In the immersion tank 15 containing the HN0 body solution 16, it is treated in the same manner as in the above-mentioned embodiment to perform descaling and passivation treatment, and after washing in the water washing tank 14c, it exits the equipment from the downstream direction. .
〈発明の効果〉
以上、実施例と共に詳しく述べたように、本発明に係る
ステンレス鋼板の脱スケール方法によれば以下の効果を
奏する。<Effects of the Invention> As described above in detail with Examples, the method for descaling a stainless steel plate according to the present invention provides the following effects.
■ レーザー光照射を行って脱スケール化を図るため、
鋼板表面のスケール層を瞬間的に溶融、蒸発して除去す
ることができ、処理時間が短くなると共に、必要とする
ライン長も数ｍ程度で済む。■ In order to descale by irradiating laser light,
The scale layer on the surface of the steel plate can be instantly melted and evaporated to remove it, reducing the processing time and requiring only a few meters of line length.
■ レーザー光照射に係る電力は少ないので、従来に比
べ脱スケール化の省コスト化が図れる。■ Since the power required for laser light irradiation is small, descaling costs can be reduced compared to conventional methods.
■ レーザー光の照射後に、電解を行う場合も、従来法
に比べ大幅に時間が短縮化され、場合によっては電解を
省略することも可能である。■ Even when electrolysis is performed after irradiation with laser light, the time is significantly shortened compared to conventional methods, and in some cases, it is possible to omit electrolysis.
■ 電解に必要な設備が大幅に縮少され、またこれに伴
う電気量の低減化も図ることができる。■ The equipment required for electrolysis is significantly reduced, and the amount of electricity used can also be reduced accordingly.
■ よって、脱スケール設備のライン長が大幅に短縮さ
れ、設備が簡略化されることで、設備費の縮少が大とな
る。■ Therefore, the line length of the descaling equipment is significantly shortened and the equipment is simplified, resulting in a significant reduction in equipment costs.
■ また、運転に必要な電力も低減され、運転コストも
従来と比べて縮少化される。■ Also, the power required for operation is reduced, and operating costs are also reduced compared to conventional systems.
■ ライン速度においても、従来のような制限はなく生
産量を増加するために、ライン速度を上げることに特に
制限はない。■ There are no restrictions on line speed as in the past, and there are no particular restrictions on increasing the line speed in order to increase production.
以上■〜■に述べたように、本発明がもたらす設備的、
経済的効果は非常に大きいものとなる。As stated above in ■ to ■, the equipment and
The economic effects will be huge.
第１図〜第３図は各々本発明の一実施例に係る脱スケー
ル工程図、第４図は脱スケール処理の概念図、第５図、
第６図は各々従来技術に係る脱スケール工程図である。
図 面 中、
１１はステンレス鋼板、
１２はレーザー光、
１３はレーザー発振装置、
１４ａ〜１４ｃは水洗槽、
１５は浸漬槽、
１６はＨＦ −ＨＮＯ体溶液、
１７は電解槽、
１８はＨ２ＳＯ４又！：ｆＨＮ Ｏ３水溶液である。
特 許 出 願 人
三菱重工業株式会社
代 理 人1 to 3 are descaling process diagrams according to an embodiment of the present invention, FIG. 4 is a conceptual diagram of the descaling process, and FIG.
FIG. 6 is a descaling process diagram according to the prior art. In the drawing, 11 is a stainless steel plate, 12 is a laser beam, 13 is a laser oscillation device, 14a to 14c are washing tanks, 15 is an immersion tank, 16 is an HF-HNO body solution, 17 is an electrolytic tank, and 18 is a H2SO4 or! :fHN O3 aqueous solution. Patent applicant Mitsubishi Heavy Industries, Ltd. Agent
Claims (1)
面に生成したスケール層に、レーザー光を照射して該ス
ケール層を溶融，蒸発させて除去することを特徴とする
ステンレス鋼板の脱スケール方法。 ２）圧延後のステンレス鋼板を焼鈍した際に該鋼板の表
面に生成したスケール層に、レーザー光を照射して該ス
ケール層を溶融，蒸発させて除去した後、硝酸あるいは
硝フッ酸に浸漬することを特徴とするステンレス鋼板の
脱スケール方法。 ３）圧延後のステンレス鋼板を焼鈍した際に該鋼板の表
面に生成したスケール層に、レーザー光を照射して該ス
ケール層を溶融，蒸発させて除去した後、硫酸，硝酸又
は中性塩溶液中で電解し、さらに硝酸あるいは硝フッ酸
に浸漬することを特徴とするステンレス鋼板の脱スケー
ル方法。[Claims] 1) A scale layer formed on the surface of a rolled stainless steel plate when the steel plate is annealed is irradiated with laser light to melt and evaporate the scale layer and remove it. A method for descaling stainless steel plates. 2) The scale layer generated on the surface of the steel plate when the rolled stainless steel plate is annealed is irradiated with laser light to melt and evaporate the scale layer, and then immersed in nitric acid or nitric-hydrofluoric acid. A method for descaling stainless steel sheets, characterized by: 3) The scale layer generated on the surface of the steel plate when the rolled stainless steel plate is annealed is irradiated with laser light to melt and evaporate the scale layer, and then removed using sulfuric acid, nitric acid or a neutral salt solution. A method for descaling stainless steel sheets, which is characterized by electrolysis in a stainless steel plate, followed by immersion in nitric acid or nitric-hydrofluoric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30620390A JPH04182020A (en) | 1990-11-14 | 1990-11-14 | Method for descaling stainless steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30620390A JPH04182020A (en) | 1990-11-14 | 1990-11-14 | Method for descaling stainless steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04182020A true JPH04182020A (en) | 1992-06-29 |
Family
ID=17954238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30620390A Pending JPH04182020A (en) | 1990-11-14 | 1990-11-14 | Method for descaling stainless steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04182020A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5736709A (en) * | 1996-08-12 | 1998-04-07 | Armco Inc. | Descaling metal with a laser having a very short pulse width and high average power |
| WO2007148655A1 (en) * | 2006-06-20 | 2007-12-27 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Texture material measuring device and texture material measuring method |
| US20100258982A1 (en) * | 2008-01-18 | 2010-10-14 | Miasole | Laser polishing of a solar cell substrate |
| KR20180110085A (en) * | 2016-03-18 | 2018-10-08 | 에스엠에스 그룹 게엠베하 | Apparatus for manufacturing processed materials of predetermined type and method thereof |
| KR20180117139A (en) * | 2016-03-18 | 2018-10-26 | 에스엠에스 그룹 게엠베하 | Scale removal apparatus and method thereof |
| WO2020108897A1 (en) * | 2018-11-27 | 2020-06-04 | Sms Group Gmbh | Method and device for inspecting a metal cast product |
| CN111389941A (en) * | 2020-03-04 | 2020-07-10 | 北京航空航天大学合肥创新研究院 | Laser cleaning method for oxide layer on surface of hot-rolled stainless steel |
| JP2021065922A (en) * | 2019-10-25 | 2021-04-30 | 日鉄ステンレス株式会社 | Oxidized scale removal method and stainless steel strip production method |
-
1990
- 1990-11-14 JP JP30620390A patent/JPH04182020A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5736709A (en) * | 1996-08-12 | 1998-04-07 | Armco Inc. | Descaling metal with a laser having a very short pulse width and high average power |
| WO2007148655A1 (en) * | 2006-06-20 | 2007-12-27 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Texture material measuring device and texture material measuring method |
| JPWO2007148655A1 (en) * | 2006-06-20 | 2009-11-19 | 東芝三菱電機産業システム株式会社 | Tissue material measuring apparatus and tissue material measuring method |
| US20100258982A1 (en) * | 2008-01-18 | 2010-10-14 | Miasole | Laser polishing of a solar cell substrate |
| US8536054B2 (en) * | 2008-01-18 | 2013-09-17 | Miasole | Laser polishing of a solar cell substrate |
| KR20180110085A (en) * | 2016-03-18 | 2018-10-08 | 에스엠에스 그룹 게엠베하 | Apparatus for manufacturing processed materials of predetermined type and method thereof |
| KR20180117139A (en) * | 2016-03-18 | 2018-10-26 | 에스엠에스 그룹 게엠베하 | Scale removal apparatus and method thereof |
| WO2020108897A1 (en) * | 2018-11-27 | 2020-06-04 | Sms Group Gmbh | Method and device for inspecting a metal cast product |
| JP2021065922A (en) * | 2019-10-25 | 2021-04-30 | 日鉄ステンレス株式会社 | Oxidized scale removal method and stainless steel strip production method |
| CN111389941A (en) * | 2020-03-04 | 2020-07-10 | 北京航空航天大学合肥创新研究院 | Laser cleaning method for oxide layer on surface of hot-rolled stainless steel |
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