JPS638198B2 - - Google Patents
Info
- Publication number
- JPS638198B2 JPS638198B2 JP24754284A JP24754284A JPS638198B2 JP S638198 B2 JPS638198 B2 JP S638198B2 JP 24754284 A JP24754284 A JP 24754284A JP 24754284 A JP24754284 A JP 24754284A JP S638198 B2 JPS638198 B2 JP S638198B2
- Authority
- JP
- Japan
- Prior art keywords
- electrolysis
- stainless steel
- coloring
- current density
- colored
- 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.)
- Expired
Links
- 238000005868 electrolysis reaction Methods 0.000 claims description 40
- 229910001220 stainless steel Inorganic materials 0.000 claims description 28
- 239000010935 stainless steel Substances 0.000 claims description 28
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 11
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 description 26
- 238000004040 coloring Methods 0.000 description 19
- 239000000243 solution Substances 0.000 description 11
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 8
- 238000005299 abrasion Methods 0.000 description 8
- 238000007796 conventional method Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000012733 comparative method Methods 0.000 description 3
- NPURPEXKKDAKIH-UHFFFAOYSA-N iodoimino(oxo)methane Chemical compound IN=C=O NPURPEXKKDAKIH-UHFFFAOYSA-N 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- 229910000423 chromium oxide Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 210000001951 dura mater Anatomy 0.000 description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Chemical Treatment Of Metals (AREA)
- Electrochemical Coating By Surface Reaction (AREA)
Description
＜産業上の利用分野＞
本発明は耐摩耗性に優れた着色ステンレス鋼材
の製造方法に関するものである。
＜従来の技術とその問題点＞
ステンレス鋼板の化学的着色法として、従来よ
り（硫酸＋クロム酸）混合液を用いたいわゆる
INCO法が多く用いられている。
化学着色ステンレス鋼板の主要な用途は建材用
であることから、ステンレス鋼の基本的性質とし
ての耐食性の他に耐摩耗性が求められる。
この点においてステンレス鋼の表面に生成した
着色酸化皮膜を硫酸とクロム酸からなる電解液中
で陰極電解し、皮膜中にクロムを析出させて耐食
性と耐摩耗性を向上させる方法がINCO社より開
示されている（特公昭53―31817号参照）。
このINCO法は、「着色」工程と「硬膜」工程
の２工程から成るもので、各々独立の溶液組成・
温度・処理条件で、当該工程を行うものであり、
主としてバツチ方式で単板の着色ステンレス鋼板
の製造に用いられている。
化学着色ステンレス鋼板を安価に提供するに
は、工程の省略化と単板処理に依らない連続ライ
ン化が必要となる。即ち、「着色」、「硬膜」とい
う２工程では、この間に水洗・乾燥という操作を
しないと連続ライン化できない。さらに、「硬膜」
工程において着色時の色調が変化するためその前
の「着色」工程において最終的な決まつた色調を
得るためには予めこの色調変化を見込んだ処理を
行うという煩雑な操作を要する。また単板処理の
場合でも「着色液」、「硬膜液」の２液を必要とす
る。ここから、「着色」・「硬膜」を１液１工程で
行い得れば、工程が簡略化でき、連続ラインでの
着色ステンレス鋼板の製造が工業上可能となる。
＜発明の目的＞
本発明は、上述した従来技術の問題点を解決し
ようとしてなされたものであり、その目的とする
ところは、着色ステンレス鋼材の耐摩耗性を著し
く向上させるとともに、このような着色ステンレ
ス鋼材を１液１工程で製造することができる着色
ステンレス鋼材の製造方法を提供しようとするに
ある。
＜発明の構成＞
すなわち、本発明は、２モル以上の６価クロム
と2.5モル以上の硫酸を含む混合溶液中において、
陽極電流密度0.01〜3.0A／ｄm2、陰極電流密度
0.03〜5.0A／ｄm2、繰返し数100Hz以下の交番電
流電解を行うことを特徴とする着色ステンレス鋼
材の製造方法を提供するものである。
以下に本発明の着色ステンレス鋼材の製造方法
を詳細に説明する。
ここでいうステンレス鋼材とは、線材、管材、
板材、塊、異形断面材、粉粒体など任意の形状で
よいが、以下の説明は代表的に鋼板について行
う。
化学着色法による酸化皮膜は、Cr2O3主体のも
ので、電気化学的には陽極電解を行うことにより
得られる。また、硬膜処理は、着色とは逆に陰極
電解を施すことにより、多孔質なCr2O3皮膜を強
固にしている。本発明は、「着色」；陽極電解、
「硬膜」；陰極電解という基本的認識を基にして、
鋭意研究を重ねた結果、交互に電流方向を変え
て、電解を行う方法において、陽極電気量と陰極
電気量を最適に組合せることにより１液１工程で
耐摩耗性に優れた着色ステンレス鋼板が製造でき
ることを見い出した。
ここで用いる溶液は、硫酸濃度が高く、従来は
着色用にのみ用いられてきたものであり、硬膜処
理ができるとは知られていなかつた。
このような着色用溶液でも、硬膜処理が上述の
方法に依れば可能であるということは、全く新し
い発見である。
本発明に係る交番電流電解による着色ステンレ
ス鋼板の製造方法は、第１図に例示するように交
番電流を印加するものである。陽・陰極電解の電
流密度と電解時間を適宜に組み合せ所定の回数
〔６価クロム（２モル以上）＋H2SO4（2.5モル以
上）〕溶液中で交番電解を行わせることを特徴と
するものである。以下に良好な耐摩耗性を有する
着色皮膜の得られる電解条件およびその理由を記
す。
(1) 陽極電解電流密度：0.01〜3.0A／ｄm2，
(2) 陰極電解電流密度：0.03〜5.0A／ｄm2，
(3) 電解繰り返し数 ：100Hz以下
陽極電解電流密度が0.01A／ｄm2未満では全く
着色しない。また、3.0A／ｄm2超では干渉色を
有する均一な皮膜が得られないので、陽極電解電
流密度は0.01〜3.0A／ｄm2の範囲とする。
陰極電解電流密度が0.03A／ｄm2未満では皮膜
は後述の耐摩耗性試験で容易に剥離する。また、
5.0A／ｄm2以上では鋼板表面は、全面金属光沢
になり着色した鋼板とは言い難いので、陰極電解
電流密度は0.03〜5.0A／ｄm2の範囲とする。
電解繰り返し数が100Hzをこえると着色しない
ので、100Hz以下が適する。色調調製法としては、
上述の(1)〜(3)の条件を満たすある特定条件で電解
くり返し数を陽極電流密度、電解時間を選択する
ことで任意の干渉色が得られる。
以上に述べた電解条件で、無水クロム酸、重ク
ロム酸ナトリウム、重クロム酸カリウム等の形で
添加した２モル以上の６価クロムと2.5モル以上
の硫酸を含む混合溶液中において交番電流電解を
行うことにより簡便に、良好な耐摩耗性を有する
着色ステンレス鋼板が得られる。
この方法に依れば、従来は「着色」・「硬膜」と
いう２工程を要していたものが、僅か１工程です
むこと、更に単板のみならず連続着色にも適用で
きる。このように本発明は、従来は高価であつた
化学着色ステンレス鋼板を工業的に安価に提供す
る方法であり、建材分野における着色ステンレス
鋼の需要の増大に対して、大きな寄与をなすもの
である。
＜実施例＞
本発明に係る交番電流電解による着色ステンレ
ス鋼板の製造方法を実施例つき具体的に説明す
る。
SUS 304 BA（光輝焼鈍処理）板（大きさ100
×100mm）を、（硫酸500g／＋無水クロス酸
250g／）溶液中に浸漬し、種々の条件で交番
電解を計20分行つた。
その後荷重500gの条件で耐摩耗試験機を用い
て、着色皮膜表面を酸化クロム研磨紙で擦ること
により耐摩耗性試験を行つた。耐摩耗性の評価
は、着色皮膜が完全に除去されるまでの酸化クロ
ム研磨紙による摩耗回数で行い、この回数が多く
なる程耐摩耗性が優れていると判定した。
比較として従来法によるもの、即ち(1)自然浸漬
にて着色→硬膜処理と(2)直流電解にて着色→硬膜
処理の２方法を用いた。この際、着色用溶液は、
（硫酸490g／＋無水クロム酸250g／）溶液
で、硬膜処理は（無水クロム酸250g／＋硫酸
2.5g／）溶液で、これらは、（特公昭53―
31817）に記載されている。
第１表に、詳細な電解条件と耐摩耗試験結果を
本発明法と比較としての比較法および従来法とと
もにまとめて示す。
従来法および比較法での摩耗回数は、高々300
回程度であるのに比べて、本発明に係る交番電流
電解法の場合、その摩耗回数は、650〜720回とい
う約2.5倍の値であつた。これらのデータより、
本発明による交番電流電解法で製造した着色ステ
ンレス鋼板の耐摩耗性は、従来法および比較法に
よるものより著しく優れていることは明白であ
る。
第２表に詳細な電解くり返し条件と色調の関係
の例を示す。
これは、第１表と同様の条件において、陰極電
解電流密度を一定の0.10A／ｄm2とし、陽極電解
電流密度は0.03，0.10，0.50及び2.0A／ｄm2また
は電解くり返し数は100Hz以下としたとき得られ
たデータをまとめたものである。
この表のデータから明らかなように、一定の電
解条件の下で単に電解くり返し数を選択すること
で任意の干渉色を有する皮膜が得られる。即ち、
色調調製法として従来法とは全く異なる新しいも
のである。
<Industrial Field of Application> The present invention relates to a method for manufacturing colored stainless steel material with excellent wear resistance. <Conventional technology and its problems> As a chemical coloring method for stainless steel sheets, a so-called so-called method using a mixed solution (sulfuric acid + chromic acid) has traditionally been used.
The INCO method is often used. Since the main use of chemically colored stainless steel sheets is for building materials, wear resistance is required in addition to corrosion resistance, which is a basic property of stainless steel. In this regard, INCO has disclosed a method in which the colored oxide film formed on the surface of stainless steel is electrolyzed cathodically in an electrolyte consisting of sulfuric acid and chromic acid to precipitate chromium in the film to improve corrosion resistance and wear resistance. (See Special Publication No. 53-31817). This INCO method consists of two steps: a "coloring" step and a "hardening" step, each of which has an independent solution composition and
The process is carried out under certain temperature and processing conditions,
It is mainly used in the production of veneer colored stainless steel sheets using the batch method. In order to provide chemically colored stainless steel sheets at low cost, it is necessary to simplify the process and create a continuous line that does not rely on veneer processing. That is, the two steps of "coloring" and "hardening" cannot be made into a continuous line unless washing with water and drying are performed in between. In addition, the “dura mater”
Since the color tone during coloring changes during the coloring process, in order to obtain the final fixed color tone in the preceding "coloring" step, it is necessary to carry out a process that takes into account this color tone change in advance, which is a complicated operation. Furthermore, even in the case of veneer processing, two liquids are required: a "coloring solution" and a "hardening solution." From this, if "coloring" and "hardening" can be performed in one step with one liquid, the process can be simplified and it becomes possible to manufacture colored stainless steel sheets on a continuous line industrially. <Object of the Invention> The present invention has been made to solve the problems of the prior art described above, and its purpose is to significantly improve the wear resistance of colored stainless steel materials, and to improve the wear resistance of colored stainless steel materials. The purpose of the present invention is to provide a method for producing colored stainless steel material, which can produce stainless steel material in one step using one liquid. <Structure of the Invention> That is, the present invention provides a solution in which a mixed solution containing 2 moles or more of hexavalent chromium and 2.5 moles or more of sulfuric acid,
Anode current density 0.01~3.0A/dm 2 , cathode current density
The present invention provides a method for producing a colored stainless steel material, which is characterized by carrying out alternating current electrolysis at 0.03 to 5.0 A/dm 2 and a repetition rate of 100 Hz or less. The method for producing a colored stainless steel material of the present invention will be explained in detail below. Stainless steel materials here include wire rods, pipe materials,
Although any shape may be used, such as a plate, a lump, a modified cross-section material, or a powder, the following description will be made with reference to a steel plate as a representative example. The oxide film formed by the chemical coloring method is mainly composed of Cr 2 O 3 and can be obtained electrochemically by performing anodic electrolysis. Also, in hardening treatment, the porous Cr 2 O 3 coating is strengthened by applying cathode electrolysis, which is the opposite of coloring. The present invention relates to "coloring"; anodic electrolysis;
“Dura mater”: Based on the basic understanding of cathodic electrolysis,
As a result of extensive research, we have succeeded in producing colored stainless steel sheets with excellent wear resistance in a single liquid and one step process by optimally combining the amount of electricity at the anode and cathode using a method in which electrolysis is carried out by alternating the current direction. We discovered that it can be manufactured. The solution used here has a high sulfuric acid concentration and has conventionally been used only for coloring, and was not known to be capable of hardening. It is a completely new discovery that even with such a coloring solution, film hardening is possible by the above-mentioned method. The method of manufacturing a colored stainless steel sheet by alternating current electrolysis according to the present invention involves applying an alternating current as illustrated in FIG. It is characterized by performing alternating electrolysis in a solution of [hexavalent chromium (2 moles or more) + H 2 SO 4 (2.5 moles or more)] by suitably combining the current density and electrolysis time of anode and cathode electrolysis for a predetermined number of times. It is. The electrolytic conditions for obtaining a colored film having good abrasion resistance and the reasons thereof are described below. (1) Anodic electrolysis current density: 0.01-3.0A/dm 2 , (2) Cathode electrolysis current density: 0.03-5.0A/dm 2 , (3) Electrolysis repetition rate: 100Hz or less Anodic electrolysis current density 0.01A/dm If it is less than 2 , it will not be colored at all. Further, since a uniform film having interference color cannot be obtained at a current density exceeding 3.0 A/dm 2 , the anodic electrolytic current density is set in a range of 0.01 to 3.0 A/dm 2 . When the cathode electrolytic current density is less than 0.03 A/dm 2 , the film easily peels off in the wear resistance test described below. Also,
At 5.0 A/dm 2 or more, the surface of the steel sheet becomes metallic luster over the entire surface and cannot be called a colored steel sheet, so the cathode electrolytic current density is set in the range of 0.03 to 5.0 A/dm 2 . If the electrolytic repetition rate exceeds 100Hz, coloring will not occur, so a frequency of 100Hz or less is suitable. As a color tone adjustment method,
Any interference color can be obtained by selecting the number of electrolysis cycles, anode current density, and electrolysis time under certain specific conditions that satisfy the conditions (1) to (3) above. Under the electrolysis conditions described above, alternating current electrolysis was carried out in a mixed solution containing 2 moles or more of hexavalent chromium added in the form of chromic anhydride, sodium dichromate, potassium dichromate, etc. and 2.5 moles or more of sulfuric acid. By carrying out this process, a colored stainless steel sheet having good wear resistance can be easily obtained. According to this method, what conventionally required two steps of "coloring" and "during" can now be completed in just one step, and can be applied not only to veneers but also to continuous coloring. As described above, the present invention is a method for industrially providing chemically colored stainless steel sheets, which were conventionally expensive, at low cost, and makes a significant contribution to the increasing demand for colored stainless steel in the field of building materials. . <Example> The method for manufacturing a colored stainless steel sheet by alternating current electrolysis according to the present invention will be specifically explained with examples. SUS 304 BA (bright annealing treatment) plate (size 100
x 100mm), (sulfuric acid 500g/+ anhydrous cross acid
250g/) solution, and alternating electrolysis was performed under various conditions for a total of 20 minutes. Thereafter, an abrasion resistance test was carried out by rubbing the surface of the colored film with chromium oxide abrasive paper using an abrasion resistance tester under the condition of a load of 500 g. Abrasion resistance was evaluated based on the number of times of abrasion with chromium oxide abrasive paper until the colored film was completely removed, and it was determined that the greater the number of abrasions, the better the abrasion resistance. For comparison, two conventional methods were used: (1) coloring by natural immersion followed by hardening and (2) coloring by direct current electrolysis followed by hardening. At this time, the coloring solution is
(490g of sulfuric acid/+250g of chromic anhydride/) solution, hardening treatment with (250g of chromic anhydride/+250g of sulfuric acid
2.5g/) solution, these are
31817). Table 1 shows detailed electrolytic conditions and abrasion test results together with the method of the present invention, a comparative method for comparison, and a conventional method. The number of wears using the conventional method and comparative method is at most 300.
In contrast, in the case of the alternating current electrolysis method according to the present invention, the number of wears was approximately 2.5 times, 650 to 720 times. From these data,
It is clear that the wear resistance of the colored stainless steel sheets produced by the alternating current electrolysis method according to the invention is significantly superior to that produced by the conventional and comparative methods. Table 2 shows detailed examples of the relationship between electrolysis repetition conditions and color tone. This means that under the same conditions as in Table 1, the cathode electrolysis current density is a constant 0.10A/ dm2 , the anodic electrolysis current density is 0.03, 0.10, 0.50, and 2.0A/ dm2 , or the electrolysis repetition rate is 100Hz or less. This is a summary of the data obtained. As is clear from the data in this table, a film having any interference color can be obtained by simply selecting the number of electrolysis cycles under certain electrolysis conditions. That is,
This is a new color tone adjustment method that is completely different from conventional methods.
【表】
アンダーラインは本発明の範囲からはずれるもの
を示す。
[Table] Underlined items indicate items outside the scope of the present invention.
【表】【table】
【表】【table】
【表】
＜発明の効果＞
本発明の交番電流電解による着色ステンレスの
製造方法は、１工程で耐摩耗性に優れた着色ステ
ンレス鋼材を製造するものであり、連続的に着色
ステンレス鋼材を生産する方法に適用できる。
本発明の方法により製造された着色ステンレス
鋼材の耐摩耗性は従来のものに比べて著しく向上
している。[Table] <Effects of the Invention> The method for producing colored stainless steel by alternating current electrolysis of the present invention produces colored stainless steel materials with excellent wear resistance in one step, and continuously produces colored stainless steel materials. Applicable to methods. The wear resistance of the colored stainless steel material produced by the method of the present invention is significantly improved compared to the conventional material.
第１図は本発明の交番電流電解による着色ステ
ンレス鋼材の製造方法の概念を示すもので、陽極
電解と陰極電解を交互に行わしむるものである。
たて軸は、電解電流密度、横軸は、電解時間であ
る。
符号の説明、１……陽極電解時間、２……陽極
電解電流密度、３……陰極電解時間、４……陰極
電解電流密度。
FIG. 1 shows the concept of the method for manufacturing colored stainless steel materials by alternating current electrolysis according to the present invention, in which anodic electrolysis and cathodic electrolysis are performed alternately.
The vertical axis is the electrolysis current density, and the horizontal axis is the electrolysis time. Explanation of symbols: 1...Anodic electrolysis time, 2...Anodic electrolysis current density, 3...Cathode electrolysis time, 4...Cathode electrolysis current density.
Claims (1)
酸を含む混合溶液中において、陽極電流密度0.01
〜3.0A／ｄm2、陰極電流密度0.03〜5.0A／ｄm2、
繰返し数100Hz以下の交番電流電解を行うことを
特徴とする着色ステンレス鋼材の製造方法。1 In a mixed solution containing 2 moles or more of hexavalent chromium and 2.5 moles or more of sulfuric acid, an anode current density of 0.01
~3.0A/ dm2 , cathode current density 0.03~5.0A/ dm2 ,
A method for producing colored stainless steel material, characterized by performing alternating current electrolysis at a repetition rate of 100 Hz or less.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24754284A JPS61127899A (en) | 1984-11-22 | 1984-11-22 | Production of colored stainless steel sheet |
| US06/887,020 US4859287A (en) | 1984-11-22 | 1985-11-22 | Method for producing colored stainless steel stock |
| EP85905888A EP0204846B1 (en) | 1984-11-22 | 1985-11-22 | Method of manufacturing colored stainless steel materials and apparatus for continuously manufacturing same |
| DE8585905888T DE3583142D1 (en) | 1984-11-22 | 1985-11-22 | METHOD FOR PRODUCING COLORED STAINLESS STEEL MATERIALS AND DEVICE FOR THEIR CONTINUOUS PRODUCTION. |
| PCT/JP1985/000647 WO1986003229A1 (en) | 1984-11-22 | 1985-11-22 | Method of manufacturing colored stainless steel materials and apparatus for continuously manufacturing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24754284A JPS61127899A (en) | 1984-11-22 | 1984-11-22 | Production of colored stainless steel sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61127899A JPS61127899A (en) | 1986-06-16 |
| JPS638198B2 true JPS638198B2 (en) | 1988-02-22 |
Family
ID=17165041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24754284A Granted JPS61127899A (en) | 1984-11-22 | 1984-11-22 | Production of colored stainless steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61127899A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63247395A (en) * | 1986-11-28 | 1988-10-14 | Kawasaki Steel Corp | Apparatus for continuously coloring metallic sheet and metallic strip |
-
1984
- 1984-11-22 JP JP24754284A patent/JPS61127899A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61127899A (en) | 1986-06-16 |
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