JPH10121276A - Production of ferritic stainless steel sheet free from unevenness in color tone - Google Patents
Production of ferritic stainless steel sheet free from unevenness in color toneInfo
- Publication number
- JPH10121276A JPH10121276A JP27786696A JP27786696A JPH10121276A JP H10121276 A JPH10121276 A JP H10121276A JP 27786696 A JP27786696 A JP 27786696A JP 27786696 A JP27786696 A JP 27786696A JP H10121276 A JPH10121276 A JP H10121276A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- stainless steel
- ferritic stainless
- color tone
- pickling
- 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
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、屋根材等の建材と
しての使用に適した耐食性、防眩性を有し、色調むらが
ないフェライト系ステンレス鋼板の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a ferritic stainless steel sheet having corrosion resistance and anti-glare properties suitable for use as a building material such as a roofing material and having no uneven color tone.
【０００２】[0002]
【従来の技術】屋根材や外壁材等の建材として使用され
るフェライト系ステンレス鋼板には、ステンレス鋼とし
て当然有する耐食性のみならず、防眩性および表面の色
調むらがないことが求められる。防眩性を向上させる手
段としては、特開平１−１６２７７９号公報に化学発色
硬化法により発色膜を形成する方法が開示されている。
また、防眩性と耐食性に優れたステンレス鋼板を製造す
る方法として、特開平６−４９５３９号公報には、鋼板
にダルロールによる冷間圧延を施した後、特殊な光輝焼
鈍を行い、その後、硝酸溶液に浸漬する方法が開示され
ている。2. Description of the Related Art A ferritic stainless steel sheet used as a building material such as a roof material or an outer wall material is required to have not only the corrosion resistance inherently possessed by stainless steel, but also the antiglare property and the absence of uneven color tone of the surface. As a means for improving the antiglare property, Japanese Patent Application Laid-Open No. 1-162779 discloses a method of forming a color-forming film by a chemical color-curing method.
Japanese Patent Application Laid-Open No. 6-49539 discloses a method of manufacturing a stainless steel sheet having excellent anti-glare properties and corrosion resistance. A method of immersing in a solution is disclosed.
【０００３】色調むらを防止する方法としては、特開平
６−１８４７７４号公報に、酸洗直後のステンレス鋼板
の光沢度を測定し、その結果を基に酸洗条件を変更する
方法が開示されている。この方法は、酸洗による金属溶
解によって生じる表面の微視的な荒れの度合いを一定に
することで、色調むらを防止するものである。しかし、
酸洗条件を制御するこの方法では、テストラインと実際
のラインとで酸洗溶液等の条件が微妙に相違するために
最適な制御条件を決定することが困難である。As a method for preventing color tone unevenness, Japanese Patent Application Laid-Open No. 6-184774 discloses a method of measuring the glossiness of a stainless steel plate immediately after pickling and changing the pickling conditions based on the result. I have. This method is to prevent the unevenness of the color tone by making the degree of microscopic roughness of the surface caused by melting of the metal by pickling constant. But,
In this method of controlling the pickling conditions, it is difficult to determine the optimal control conditions because the conditions of the pickling solution and the like are slightly different between the test line and the actual line.
【０００４】防眩性を得るためにダルロールによる冷間
圧延が施された後のフェライト系ステンレス鋼板には、
通常、中性塩電解や必要に応じて硝酸電解が施された
後、高耐食性が求められる鋼種に対しては、硝酸と弗酸
の混合溶液（以下、硝弗酸液という）に浸漬する酸洗が
施される。その際の硝弗酸液は、撹拌が全くされていな
いか、撹拌されていたとしても酸洗浴槽に鋼板が入る付
近で横壁からジェット流が一部で起こされている程度で
ある。[0004] Ferritic stainless steel sheets that have been subjected to cold rolling with dull rolls to obtain antiglare properties include:
Normally, for steel types requiring high corrosion resistance after neutral salt electrolysis and if necessary nitric acid electrolysis, the acid immersed in a mixed solution of nitric acid and hydrofluoric acid (hereinafter referred to as nitric hydrofluoric acid solution) Washing is performed. At this time, the nitric hydrofluoric acid solution is not agitated at all, or even if it is agitated, a jet stream is partially generated from the side wall near the steel plate entering the pickling bath.
【０００５】図２は、従来の硝弗酸液の撹拌状況を示す
図である。フェライト系ステンレス鋼板２は、溶液中を
数１０ｍ／ｍｉｎの速度で移動している。硝弗酸液３
は、酸洗浴槽１の入り口付近でフェライト系ステンレス
鋼板２の幅方向から水平角度４５度のジェット噴射によ
って撹拌されている。しかし、この方法では、硝弗酸液
全体を均一に撹拌することはできない。この方法は、フ
ェライト系ステンレス鋼板２の幅方向端部付近には均一
に溶液を噴射しているので均一な酸洗が行われるが、フ
ェライト系ステンレス鋼板２の幅方向中央部付近は、溶
液の撹拌が行われていないので均一な酸洗ができない。
したがって、鋼板の幅方向端部と幅方向中央部とで微妙
な酸洗の違いが起こるために色調むらが発生していた。[0005] FIG. 2 is a diagram showing a conventional stirring state of a nitric hydrofluoric acid solution. The ferritic stainless steel plate 2 moves in the solution at a speed of several tens m / min. Nitric hydrofluoric acid solution 3
Is stirred near the entrance of the pickling bath 1 by jet spraying at a horizontal angle of 45 degrees from the width direction of the ferritic stainless steel plate 2. However, this method cannot uniformly stir the entire nitric hydrofluoric acid solution. In this method, the solution is uniformly sprayed near the widthwise end of the ferritic stainless steel sheet 2, so that uniform pickling is performed. Since the stirring is not performed, uniform pickling cannot be performed.
Therefore, a slight difference in pickling occurs between the width direction end portion and the width direction center portion of the steel sheet, and color tone unevenness has occurred.
【０００６】ここでいう色調むらとは、フェライト系ス
テンレス鋼板表面の酸洗による溶解が不均一に起こった
結果、ステンレス鋼板の表面が均一な光沢色をもってい
ない状態のことである。[0006] The term "uneven color tone" as used herein refers to a state in which the surface of a ferritic stainless steel sheet does not have a uniform glossy color as a result of uneven dissolution of the surface by pickling.
【０００７】[0007]
【発明が解決しようとする課題】本発明の目的は、表面
に色調むらがなく、かつ耐食性と防眩性を有するフェラ
イト系ステンレス鋼板の製造方法を提供することであ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a ferritic stainless steel sheet having no unevenness in color on the surface and having corrosion resistance and anti-glare properties.
【０００８】[0008]
【課題を解決するための手段】本発明の要旨は、下記の
フェライト系ステンレス鋼板の製造方法にある。The gist of the present invention resides in the following method for producing a ferritic stainless steel sheet.
【０００９】『表面平均粗さＲａを１〜１０μｍとした
フェライト系ステンレス鋼板の表面処理に際し、鋼板を
挟んで上側と下側を渦状に撹拌させた硝酸と弗酸の混合
溶液中で酸洗処理を施した後、大気中において、３５０
〜４５０℃で、３０〜１２０秒間保持する熱処理を施
す』。In the surface treatment of a ferritic stainless steel sheet having a surface average roughness Ra of 1 to 10 μm, an acid pickling treatment is performed in a mixed solution of nitric acid and hydrofluoric acid in which the upper and lower sides of the steel sheet are vortexed. And then 350 in air
Perform heat treatment at ~ 450 ° C for 30 to 120 seconds. "
【００１０】本発明では、色調むらがなく、耐食性と防
眩性に優れたフェライト系ステンレス鋼板（以下、単に
鋼板とも記す）を製造するという課題を下記のような手
段で解決している。The present invention solves the problem of producing a ferritic stainless steel sheet (hereinafter, also simply referred to as a steel sheet) having no uneven color tone and excellent in corrosion resistance and anti-glare properties by the following means.
【００１１】本発明の製造方法に用いる素材は、ダルロ
ールによる冷間圧延等を施して、表面平均粗さＲａを１
〜１０μｍとした鋼板である。ここでいう表面平均粗さ
Ｒａとは、ＪＩＳ Ｂ０６０１で規定されるものであ
る。ダルロールによる冷間圧延等によって表面平均粗さ
Ｒａを１〜１０μｍに加工しておけば、熱処理後の鋼板
の表面は、金属光沢が低下し、防眩性を持つ鋼板とな
る。The raw material used in the manufacturing method of the present invention is subjected to cold rolling by a dull roll or the like to have a surface average roughness Ra of 1
It is a steel plate having a thickness of 10 to 10 μm. The surface average roughness Ra here is defined by JIS B0601. If the surface average roughness Ra is processed to 1 to 10 μm by cold rolling using a dull roll or the like, the surface of the steel sheet after the heat treatment has a reduced metallic luster and becomes a steel sheet having antiglare properties.
【００１２】表面平均粗さＲａが１〜１０μｍである鋼
板に対して酸洗処理を施す。酸洗浴槽の硝弗酸液は、撹
拌子やプロペラ等によって撹拌しているので、酸洗浴槽
中の溶液の位置による酸洗能力、すなわち酸による金属
原子のイオン化力に違いが少ないので、鋼板の幅方向端
部と幅方向中央部前端部とで酸洗による表面の溶解状態
が同じであり、色調むらが発生しないのである。A steel sheet having a surface average roughness Ra of 1 to 10 μm is subjected to pickling treatment. Since the nitric hydrofluoric acid solution in the pickling bath is agitated by a stirrer or a propeller, there is little difference in the pickling ability depending on the position of the solution in the pickling bath, that is, the ionization power of metal atoms by acid. In the width direction end and the width direction center front end, the dissolution state of the surface due to pickling is the same, and color tone unevenness does not occur.
【００１３】本発明では、酸洗後にさらに熱処理を行
う。この熱処理は、鋼板の防眩性をより向上させるため
のものである。ただし、熱処理を行うと、鋼板の耐食性
が悪化しやすい。そこで本発明では、耐食性の悪化を最
小限に抑えつつ、防眩性を向上させるために、低温で短
時間の熱処理を施すことにした。In the present invention, heat treatment is further performed after pickling. This heat treatment is for further improving the antiglare property of the steel sheet. However, when heat treatment is performed, the corrosion resistance of the steel sheet tends to deteriorate. Therefore, in the present invention, in order to improve the antiglare property while minimizing the deterioration of the corrosion resistance, the heat treatment is performed at a low temperature for a short time.
【００１４】すなわち、本発明では、大気中において、
３５０〜４５０℃という通常の熱処理温度に比べて約５
００℃程低い温度で、３０〜１２０秒という短時間で保
持する熱処理を行う。大気中において熱処理を行うの
は、鋼表面を意図的に軽微に酸化させるためである。こ
の熱処理により、鋼板の表面に均一にＣｒ系酸化物が生
成し、鋼板の表面を覆うので、金属光沢が落ち、防眩性
が向上する。通常の熱処理を行うと、鋼板内部のＣｒが
表面に移動し酸化物を生成して、鋼中にＣｒ欠乏層が生
じ、鋼板は、いわゆる鋭敏化現象を起こしやすくなり、
耐食性が落ちる。しかし、本発明では、Ｃｒ欠乏層が生
じない程度で、かつ防眩性が得られる熱処理条件を選択
することによってこの問題を解決した。That is, in the present invention, in the atmosphere,
It is about 5 times compared to the normal heat treatment temperature of 350-450 ° C.
Heat treatment is performed at a temperature as low as about 00C for a short time of 30 to 120 seconds. The reason for performing the heat treatment in the atmosphere is to intentionally slightly oxidize the steel surface. By this heat treatment, a Cr-based oxide is uniformly generated on the surface of the steel sheet and covers the surface of the steel sheet, so that the metallic luster is reduced and the antiglare property is improved. When ordinary heat treatment is performed, Cr inside the steel sheet moves to the surface to generate an oxide, a Cr-deficient layer is generated in the steel, and the steel sheet is susceptible to a so-called sensitization phenomenon,
Corrosion resistance decreases. However, in the present invention, this problem has been solved by selecting a heat treatment condition that does not generate a Cr-deficient layer and that provides an antiglare property.
【００１５】[0015]
【発明の実施の形態】本発明のフェライト系ステンレス
鋼板の製造方法を具体的に説明する。BEST MODE FOR CARRYING OUT THE INVENTION A method for producing a ferritic stainless steel sheet according to the present invention will be specifically described.
【００１６】本発明の製造方法に用いる素材は、ダルロ
ールによる冷間圧延等を施して、表面平均粗さＲａを１
〜１０μｍとしたフェライト系ステンレス鋼板である。
ダルロールによる冷間圧延は、通常の方法でよく、例え
ば粗圧延として冷間圧延を施して、仕上げ圧延としてダ
ルロールによって圧延する方法がある。ダルロールによ
る冷間圧延前の工程としては、例えば、通常の溶製、連
続鋳造、熱間圧延を施す工程が適当である。本発明で使
用するフェライト系ステンレス鋼板の化学組成は一般的
なものであって、例えば、ＪＩＳ Ｇ４３０５で規定さ
れているフェライト系ステンレス鋼等の組成である。The raw material used in the production method of the present invention is subjected to cold rolling by a dull roll or the like to have a surface average roughness Ra of 1
A ferritic stainless steel sheet having a thickness of 10 to 10 μm.
The cold rolling by a dull roll may be an ordinary method, for example, a method of performing cold rolling as rough rolling and rolling with a dull roll as finish rolling. As a process before the cold rolling by the dull roll, for example, a process of performing ordinary melting, continuous casting, and hot rolling is appropriate. The chemical composition of the ferritic stainless steel sheet used in the present invention is a general one, for example, a composition of a ferritic stainless steel or the like specified in JIS G4305.
【００１７】表面平均粗さＲａを１〜１０μｍとした鋼
板を、鋼板を挟んで上側と下側を渦状に撹拌させた硝弗
酸液の酸洗浴槽中に浸漬する。硝弗酸液については、特
に規定はなく、例えば、硝酸濃度が４．６重量％で弗酸
濃度が０．７重量％の溶液を使用できる。鋼板の形状
は、コイル状や板状のどちらでも構わない。浸漬する酸
洗浴の大きさは、実機では、横長２ｍ、縦長８ｍ、深さ
０．５ｍ程度のものである。硝弗酸液を渦状に撹拌する
ために、例えば電動モータに直結したプロペラ等を酸洗
浴の底に複数箇所設置するとともに、酸洗浴の上蓋に
も、溶液中を撹拌できる長さのプロペラシャフト持った
プロペラを複数箇所設置する。A steel sheet having a surface average roughness Ra of 1 to 10 μm is immersed in a pickling bath of a nitric hydrofluoric acid solution in which the upper and lower sides of the steel sheet are vortexed. The nitric hydrofluoric acid solution is not particularly limited. For example, a solution having a nitric acid concentration of 4.6% by weight and a hydrofluoric acid concentration of 0.7% by weight can be used. The shape of the steel plate may be either a coil shape or a plate shape. The size of the pickling bath to be immersed is about 2 m in width, 8 m in length and 0.5 m in depth in an actual machine. In order to stir the nitric hydrofluoric acid solution, for example, a plurality of propellers directly connected to the electric motor are installed at the bottom of the pickling bath, and the upper lid of the pickling bath also has a propeller shaft long enough to stir the solution. Installed multiple propellers.
【００１８】図１は、本発明の製造方法に好適な酸洗工
程の１例を示したものである。フェライト系ステンレス
鋼板２を挟んで上側と下側に設置してあるプロペラ５を
回転させることにより、酸洗浴槽１の硝弗酸液３全体が
均一になるように渦状に撹拌する。撹拌は、フェライト
系ステンレス鋼板２を挟んで上側と下側で回転方向を逆
にし、溶液を最大流速部で５ｍ／ｓ程度に撹拌させるの
が好ましい。上側と下側で回転方向を反転させるのが望
ましいのは、ランダムな溶液の流れを作り出しやすいか
らである。この撹拌により、鋼板の幅方向端部と幅方向
中央部とで均一に酸洗が行われるので、鋼板の表面に色
調むらをが発生しにくい。FIG. 1 shows an example of a pickling process suitable for the production method of the present invention. By rotating the propellers 5 installed on the upper and lower sides of the ferritic stainless steel plate 2, the nitric hydrofluoric acid solution 3 in the pickling bath 1 is vortexed so as to be uniform. The stirring is preferably performed with the rotation direction reversed between the upper side and the lower side with the ferritic stainless steel plate 2 interposed therebetween, and the solution is stirred at a maximum flow rate of about 5 m / s. It is desirable to reverse the direction of rotation on the upper and lower sides because it is easier to create a random solution flow. By this agitation, pickling is performed uniformly at the widthwise end and the widthwise center of the steel sheet, so that unevenness of color tone is hardly generated on the surface of the steel sheet.
【００１９】プロペラ等の撹拌は、上側と下側の複数箇
所で行った方がよいが、上側と下側の一カ所ずつで撹拌
を行う場合は、フェライト系ステンレス鋼板が酸洗浴槽
へ入る近辺で撹拌を行うのが、反応初期に新鮮な混合溶
液に鋼板を曝すことができるので望ましい。また、上側
と下側でそれぞれ複数箇所で撹拌する場合は、それぞれ
隣り合ったプロペラ等が起こす渦状の流れが打ち消し合
わないように、隣り合ったプロペラ等をそれぞれ逆回転
させるのが望ましい。The stirring of the propeller and the like is preferably performed at a plurality of locations on the upper and lower sides. However, when the agitation is performed on each of the upper and lower locations, the vicinity of where the ferritic stainless steel sheet enters the pickling bath. It is desirable to carry out agitation because the steel sheet can be exposed to a fresh mixed solution at the beginning of the reaction. In addition, in the case where stirring is performed at a plurality of locations on the upper side and the lower side, it is desirable to rotate the adjacent propellers and the like in reverse so that the spiral flows generated by the adjacent propellers and the like do not cancel each other.
【００２０】酸洗前の工程としては、鋼板の歪みを取り
除き、耐力を低減するために、９８０℃程度で熱処理を
行ったり、さらに酸洗効果を高めるために中性塩電解や
硝酸電解を行ってもよい。As a step before pickling, heat treatment is performed at about 980 ° C. in order to remove distortion of the steel sheet and reduce proof stress, and neutral salt electrolysis or nitric acid electrolysis is performed in order to further enhance the pickling effect. You may.
【００２１】酸洗後の鋼板に、大気中において、３５０
〜４５０℃で、３０〜１２０秒間保持する熱処理を行
う。生産性を上げるため、熱処理を行う炉としては、連
続焼鈍炉を用いるのが好ましい。また、大気中で熱処理
を行うことが、緻密な酸化膜を微少に生成させるために
必要である。熱処理後の冷却については、特に制限はな
く、空冷や炉冷を行えばよい。The steel plate after pickling is added to the
A heat treatment is performed at a temperature of 450 ° C. for 30 to 120 seconds. In order to increase the productivity, it is preferable to use a continuous annealing furnace as the furnace for performing the heat treatment. Further, it is necessary to perform heat treatment in the air in order to minutely form a dense oxide film. The cooling after the heat treatment is not particularly limited, and may be air cooling or furnace cooling.
【００２２】熱処理温度を３５０℃未満にした場合に
は、防眩性を付与するためのＣｒ系酸化物が鋼板の表面
に発生しにくくなり、熱処理温度を４５０℃を超えるよ
うにする場合には、鋼板内部のＣｒが表面に移動して、
鋼中にＣｒ欠乏層が生じ、鋭敏化現象が起きやすくなる
ので耐食性が悪化する。また３０秒より短時間の保持で
は十分な防眩性を付加することができない。しかし１２
０秒を超える保持では、上記の理由で耐食性が悪化す
る。したがって、防眩性の付与と耐食性の悪化の両者を
考慮し、３５０〜４５０℃で３０〜１２０秒保持するこ
ととした。When the heat treatment temperature is lower than 350 ° C., a Cr-based oxide for imparting antiglare properties is less likely to be generated on the surface of the steel sheet, and when the heat treatment temperature is higher than 450 ° C. , Cr inside the steel plate moves to the surface,
A Cr-deficient layer is formed in the steel, and the sensitization phenomenon is likely to occur. Further, if the holding time is shorter than 30 seconds, sufficient antiglare property cannot be added. But 12
Holding for longer than 0 seconds results in poor corrosion resistance for the above reasons. Therefore, in consideration of both the provision of antiglare properties and the deterioration of corrosion resistance, the temperature is maintained at 350 to 450 ° C. for 30 to 120 seconds.
【００２３】前記の酸洗によって、色調むらを防止でき
るが、その後の熱処理によって色調むらが出る恐れは、
均一な雰囲気中で熱処理を行うのでない。Although the above-mentioned pickling can prevent uneven color tone, there is a possibility that uneven color tone will be caused by the subsequent heat treatment.
The heat treatment is not performed in a uniform atmosphere.
【００２４】[0024]
【実施例】本発明方法や他の方法を用いてフェライト系
ステンレス鋼板を製造し、色調むらの発生状況、防眩性
および耐食性を調査した。EXAMPLES Ferritic stainless steel sheets were manufactured by the method of the present invention and other methods, and the occurrence of uneven color tone, antiglare properties and corrosion resistance were investigated.
【００２５】表１に示す化学組成の鋼を真空溶解炉５０
ｋｇ溶製し、直径１２０ｍｍ、長さ３００ｍｍの鋳片に
凝固させて、熱間圧延を施し、２ｍｍの板厚の熱延板と
した。A steel having a chemical composition shown in Table 1 was melted in a vacuum melting furnace 50.
kg, and solidified into a slab having a diameter of 120 mm and a length of 300 mm, and hot-rolled to obtain a hot-rolled sheet having a thickness of 2 mm.
【００２６】[0026]
【表１】 [Table 1]
【００２７】熱延板に対して、仕上げ工程でダルロール
を使用した冷間圧延を行って厚さ０．４ｍｍ幅１ｍで表
面平均粗さＲａが５μｍの冷延板を製造した。その後、
大気中において、９８０℃で２０ｍ／分の通板速度で連
続焼鈍炉を用いて熱処理した。次に、硫酸ソーダ溶液中
で、１〜２０Ａ／ｄｍ2の通電条件で中性塩電解を行っ
た。さらに硝酸濃度が４．６重量％で弗酸濃度が０．７
％の硝弗酸液中に１２秒間、フェライト系ステンレス鋼
板を浸漬した。酸洗浴槽の大きさは、縦２ｍ、横８ｍ、
深さ０．５ｍであった。The hot-rolled sheet was subjected to cold rolling using dull rolls in a finishing step to produce a cold-rolled sheet having a thickness of 0.4 mm, a width of 1 m, and a surface average roughness Ra of 5 μm. afterwards,
In air, heat treatment was performed at 980 ° C. using a continuous annealing furnace at a passing speed of 20 m / min. Next, neutral salt electrolysis was performed in a sodium sulfate solution under a current supply condition of 1 to 20 A / dm 2 . Further, the nitric acid concentration was 4.6% by weight and the hydrofluoric acid concentration was 0.7%.
A ferritic stainless steel sheet was immersed in a 2% nitric hydrofluoric acid solution for 12 seconds. The size of the pickling bath is 2m long, 8m wide,
The depth was 0.5 m.
【００２８】その際、硝弗酸液をプロペラを用いて表２
に示した様々な撹拌条件で撹拌した。At this time, the nitric hydrofluoric acid solution was sprayed with a propeller as shown in Table 2.
Under the various stirring conditions shown in the above.
【００２９】[0029]
【表２】 [Table 2]
【００３０】種々の条件で酸洗したフェライト系ステン
レス鋼板の光沢度を調べることにより、色調むらの発生
状況を調査した。光沢度は、光沢度計を用いて入射角２
０゜の条件で測定した。色調むらは、鋼板表面の各位置
で光沢度に差がないほど軽微なことになる。表２には、
最低光沢度に対する最大光沢度の比が１以上、１．２未
満のものを色調むらがほとんどなく良好（表２では○で
表示）、１．２以上、１．５未満のものを色調むらが少
なく良好（表２では△で表示）、１．５以上のもの（表
２では×で表示）を色調むらが大きく不良と表示した。
本発明で規定する、溶液の上側と下側から渦状に撹拌し
た溶液中で酸洗したフェライト系ステンレス鋼板は、色
調むらが少ないことがわかる。一方、混合溶液の撹拌を
行わなかったＮｏ．１の試験による鋼板、上面と下面の
いずれか一方しか撹拌を行わなかったＮｏ．２〜５の試
験による鋼板および従来の４５度方向のジェット噴射を
行ったＮｏ．１３の試験による鋼板は、色調むらが大き
く発生した。The occurrence of uneven color tone was investigated by examining the glossiness of the ferritic stainless steel sheet pickled under various conditions. The gloss was measured using a gloss meter at an incident angle of 2
It was measured under the condition of 0 °. The color tone unevenness is so small that there is no difference in gloss at each position on the steel sheet surface. In Table 2,
Those having a ratio of the maximum gloss to the minimum gloss of 1 or more and less than 1.2 have almost no color unevenness (good in Table 2) and those having a ratio of 1.2 or more and less than 1.5 have poor color tone. Samples with little or no good (indicated by Δ in Table 2) and those with 1.5 or more (indicated by X in Table 2) were marked as poor in color tone unevenness and poor.
It can be seen that the ferrite stainless steel sheet pickled in the solution vortexed from above and below the solution, as defined in the present invention, has less color tone unevenness. On the other hand, in the case of No. No. 1 in which only one of the steel plate and the upper surface and the lower surface was stirred in the test of No. 1. No. 2 to No. 5 in which the steel plate was subjected to the test and the conventional 45 ° direction jet injection was performed. In the steel sheet according to the test of No. 13, the color tone unevenness was large.
【００３１】次に、表２に示した色調むらがほとんど発
生していないＮｏ．８、１０、１１の鋼板について孔食
電位を測定した。測定は、液温が６０℃で０．５モルの
ＮａＣｌ溶液中で行った。測定したすべての鋼板の孔食
電位は、フェライト系ステンレス鋼板として必要な孔食
電位である０．１５Ｖ（v.s. SCE）以上であり、良好な
耐食性を有していることが分かった。Next, No. 3 shown in Table 2 where color tone unevenness hardly occurred. Pitting corrosion potential was measured for 8, 10, and 11 steel plates. The measurement was performed at a liquid temperature of 60 ° C. in a 0.5 mol NaCl solution. The measured pitting potential of all the steel sheets was 0.15 V (vs SCE), which is the pitting potential required for ferritic stainless steel sheets, and it was found that the steel sheets had good corrosion resistance.
【００３２】その後、Ｎｏ．８、１０、１１のフェライ
ト系ステンレス鋼板の防眩性をさらに向上させるため
に、大気中において、３００〜５００℃のさまざま温度
で一定時間保持し、空冷する熱処理を施した。防眩性
は、光沢度を測定することにより評価した。光沢度が熱
処理の前後で２０％以上減少した鋼板を防眩性に優れた
鋼板（表３中は○で表示）、２０％未満の鋼板を防眩性
が低い鋼板（表３中では×で表示）と評価した。一方、
熱処理による耐食性の劣化を上記の条件での孔食電位を
測定することにより調査した。孔食電位が０．１５Ｖ
（v.s. SCE）以上の鋼板を耐食性が良好な鋼板（表３中
は○で表示）、０．１５Ｖ（v.s. SCE）未満の鋼板を耐
食性が不良な鋼板（表３中では×で表示）と評価した。
表３より、大気中において、３５０〜４５０℃で３０〜
１２０秒間熱処理を施した鋼板が防眩性および耐食性に
優れていることが分かる。Thereafter, No. In order to further improve the antiglare properties of the 8, 10, and 11 ferritic stainless steel sheets, heat treatment was performed in air at a temperature of 300 to 500 ° C. for a certain period of time and air cooling. The antiglare property was evaluated by measuring the glossiness. A steel sheet whose glossiness is reduced by 20% or more before and after heat treatment is a steel sheet excellent in anti-glare properties (shown by ○ in Table 3), and a steel sheet less than 20% is a steel sheet having low anti-glare properties (shown by × in Table 3). Display). on the other hand,
The deterioration of corrosion resistance due to the heat treatment was investigated by measuring the pitting potential under the above conditions. Pitting corrosion potential is 0.15V
(Vs SCE) or higher is evaluated as a steel plate with good corrosion resistance (indicated by ○ in Table 3), and a steel plate with less than 0.15V (vs SCE) is evaluated as a steel plate with poor corrosion resistance (indicated by × in Table 3) did.
From Table 3, in the atmosphere, at 350 to 450 ° C., 30 to
It can be seen that the steel sheet subjected to the heat treatment for 120 seconds has excellent anti-glare properties and corrosion resistance.
【００３３】[0033]
【表３】 [Table 3]
【００３４】[0034]
【発明の効果】本発明の製造方法により、色調むらを生
じることなく防眩性と耐食性に優れたフェライト系ステ
ンレス鋼板を得ることができる。According to the production method of the present invention, a ferritic stainless steel sheet having excellent antiglare properties and corrosion resistance can be obtained without uneven color tone.
【図１】本発明方法の酸洗工程の一例を示したものであ
る。FIG. 1 shows an example of the pickling step of the method of the present invention.
【図２】従来の硝弗酸液の撹拌状況を示す図である。FIG. 2 is a diagram showing a conventional nitric hydrofluoric acid solution stirring state.
１・・・酸洗浴槽 ２・・・フェライト系ステンレス鋼板 ３・・・硝弗酸液 ４・・・噴射ノズル ５・・・プロペラ ６・・・プロペラシャフト DESCRIPTION OF SYMBOLS 1 ... Pickling bath 2 ... Ferritic stainless steel plate 3 ... Nitric hydrofluoric acid liquid 4 ... Injection nozzle 5 ... Propeller 6 ... Propeller shaft
Claims (1)
ェライト系ステンレス鋼板の表面処理に際し、鋼板を挟
んで上側と下側を渦状に撹拌させた硝酸と弗酸の混合溶
液中で酸洗処理を施した後、大気中において、３５０〜
４５０℃で、３０〜１２０秒間保持する熱処理を施す工
程を含むことを特徴とする色調むらのないフェライト系
ステンレス鋼板の製造方法。In a surface treatment of a ferritic stainless steel sheet having a surface average roughness Ra of 1 to 10 μm, pickling is performed in a mixed solution of nitric acid and hydrofluoric acid in which the upper and lower sides of the steel sheet are vortexed. After the treatment, in the air, 350 ~
A method for producing a ferritic stainless steel sheet without uneven color tone, comprising a step of performing a heat treatment at 450 ° C. for 30 to 120 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27786696A JPH10121276A (en) | 1996-10-21 | 1996-10-21 | Production of ferritic stainless steel sheet free from unevenness in color tone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27786696A JPH10121276A (en) | 1996-10-21 | 1996-10-21 | Production of ferritic stainless steel sheet free from unevenness in color tone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10121276A true JPH10121276A (en) | 1998-05-12 |
Family
ID=17589382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27786696A Pending JPH10121276A (en) | 1996-10-21 | 1996-10-21 | Production of ferritic stainless steel sheet free from unevenness in color tone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10121276A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110249462A (en) * | 2017-02-09 | 2019-09-17 | 杰富意钢铁株式会社 | The substrate stainless steel plate and its manufacturing method of the partition steel plate of fuel cell |
-
1996
- 1996-10-21 JP JP27786696A patent/JPH10121276A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110249462A (en) * | 2017-02-09 | 2019-09-17 | 杰富意钢铁株式会社 | The substrate stainless steel plate and its manufacturing method of the partition steel plate of fuel cell |
| CN110249462B (en) * | 2017-02-09 | 2023-05-12 | 杰富意钢铁株式会社 | Base stainless steel sheet of steel sheet for separator of fuel cell and method for producing same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6498219B2 (en) | Manufacturing method of products obtained by hot rolling, direct cold rolling without pickling, reduction annealing, and hot dipping | |
| JP3219898B2 (en) | Method for producing a lithographic printing plate support | |
| KR100392123B1 (en) | Manufacturing method of austenitic stainless steel with excellent surface properties | |
| JPH10121276A (en) | Production of ferritic stainless steel sheet free from unevenness in color tone | |
| JPH07216524A (en) | Hot dipping method of high tensile strength hot rolled steel plate | |
| JP3915235B2 (en) | Method for producing austenitic stainless steel sheet without surface pattern | |
| JPH05201166A (en) | Manufacture of supporter for lithographic plate | |
| KR20140001557A (en) | Method for manufacturing alloy plated steel sheet having excellent surface appearance | |
| JPH11200000A (en) | Hot dip galvannealed steel sheet excellent in low temperature chipping resistance and workability and its production | |
| JP4316029B2 (en) | Stainless steel pickling method and pickling solution | |
| JPH10219500A (en) | Finish electrolytic pickling method for descaling of stainless steel strip | |
| JP4221984B2 (en) | Martensitic stainless steel cold rolled-annealed-pickled steel strip with extremely good surface gloss | |
| JP3219010B2 (en) | Hot-rolled steel sheet hot dip coating equipment and hot-dip coated steel sheet manufacturing method | |
| JP3550996B2 (en) | Method for producing austenitic stainless steel sheet with excellent surface properties | |
| WO2005071125A1 (en) | Austenitic stainless steel sheet excellent in surface color tone and method for production thereof | |
| JP2501220B2 (en) | Heat-scratch-free stainless cold-rolled steel sheet manufacturing method | |
| SU1482961A1 (en) | Method of producing high-strength zinc-plated steel strip | |
| JP3059376B2 (en) | Austenitic stainless steel sheet excellent in gloss and corrosion resistance and method for producing the same | |
| JP2000212768A (en) | Production of hot dip metal coated steel sheet | |
| JP3277158B2 (en) | Hot-dip galvanized steel sheet and alloyed hot-dip galvanized steel sheet with excellent appearance | |
| JPH0525666A (en) | Manufacture of austenitic stainless steel strip | |
| JP3415924B2 (en) | Manufacturing method of high gloss stainless steel sheet | |
| JPS6354781B2 (en) | ||
| JPS62146300A (en) | Method for degreasing cold rolled stainless steel strip | |
| CN114657348A (en) | Production method of low-carbon cold-rolled enamel steel with high fishscale resistance |