JPS5881979A - Method for descaling cr containing stainless steel - Google Patents
Method for descaling cr containing stainless steelInfo
- Publication number
- JPS5881979A JPS5881979A JP17651781A JP17651781A JPS5881979A JP S5881979 A JPS5881979 A JP S5881979A JP 17651781 A JP17651781 A JP 17651781A JP 17651781 A JP17651781 A JP 17651781A JP S5881979 A JPS5881979 A JP S5881979A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- descaling
- sulfuric acid
- pickling
- steel
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はcr系ステンレス鋼の脱スケール方法に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for descaling CR stainless steel.
ステンレス鋼の化学的な脱スケールは、一般に硫酸など
の強酸中で粗酸洗し、続いて硝酸と弗酸の混合溶液中で
仕上げ酸洗して行なわれている。Chemical descaling of stainless steel is generally carried out by rough pickling in a strong acid such as sulfuric acid, followed by final pickling in a mixed solution of nitric acid and hydrofluoric acid.
しかし、硝酸と弗酸の混合溶液は高価であるばかりでな
く処理中にN08や肝などの有害ガスが発生して作業環
境を著しく劣化させるなどの問題があったO
一方ステンレス鋼は、その優れた耐食性とともに表面の
美麗さが大きな商品価値を与える。従っゼ脱スケール工
程においてもスケール残りは言うまでもなく、酸洗によ
シ生じたスマットの残留などには極力注意を払い、美麗
な脱スケール表面を得るように努力している。However, the mixed solution of nitric acid and hydrofluoric acid is not only expensive, but also has the problem of generating harmful gases such as N08 and liver gas during processing, which significantly deteriorates the working environment. Its high corrosion resistance and beautiful surface give it great commercial value. Therefore, in the descaling process, we pay close attention not only to residual scale, but also to the residual smut generated by pickling, and strive to obtain a beautiful descaled surface.
ステンレス鋼などの表面の美麗さを比較する一方法とし
て弐面拡散反射率を測定する方法がある。One way to compare the beauty of surfaces such as stainless steel is to measure the diffuse reflectance of the two surfaces.
即ち表面に汚れ等の付着がなく微少な凹凸も小さい場合
(肉眼的には白く見える)には!!面拡散反射率は大き
な値を示すが、表面に汚れが付着した夛、微少な凹凸が
激しくなる(肉眼的には黒っぽく見える)と表面拡散反
射率は低下する。従って!!面拡散反射率の値が大きい
程表面が美麗であるとして評価されている。In other words, if the surface is free of dirt and has small irregularities (it looks white to the naked eye)! ! The surface diffuse reflectance shows a large value, but if the surface is contaminated with dirt or minute irregularities become severe (it looks black to the naked eye), the surface diffuse reflectance decreases. Therefore! ! It is evaluated that the larger the value of the surface diffuse reflectance, the more beautiful the surface.
本発明者らは、ステンレス鋼の化学的な脱スケール工程
のそれぞれの酸の働きについて詳細に検討し九ところ、
フェライト系ステンレス鋼およびマルテンサイト系ステ
ンレス鋼(以下Cr系ステンレス鋼と総称する)の場合
、スケールの除去は硫酸による酸洗工程で終了している
こと、硝酸と弗酸の混合溶液による酸洗工程は硫酸酸洗
工程で除去できない(むしろ硫酸酸洗工程で逆に付着し
たと言う方が正しい)スマットの除去を行ない表面を美
麗に仕上げる働きを有していることを見出した。即ちC
r系ステンレス鋼の場合、脱スケールは硫酸酸洗で充分
であり、硝酸と弗酸の混合溶液による処理工程は表面を
美麗に仕上げる工程であるということができる。The present inventors have studied in detail the function of each acid in the chemical descaling process of stainless steel, and found that
In the case of ferritic stainless steel and martensitic stainless steel (hereinafter collectively referred to as Cr stainless steel), scale removal must be completed with a pickling process using sulfuric acid, or a pickling process using a mixed solution of nitric acid and hydrofluoric acid. It has been found that the smut that cannot be removed by the sulfuric acid pickling process (it would be more correct to say that it is deposited during the sulfuric acid pickling process) has the function of finishing the surface beautifully. That is, C
In the case of r-series stainless steel, sulfuric acid pickling is sufficient for descaling, and the treatment process with a mixed solution of nitric acid and hydrofluoric acid can be said to be a process for finishing the surface beautifully.
そこで、本発明者らは高価で有害ガス発生の危険のある
硝酸と弗−の混合溶液に代わって表面を美麗に仕上げる
安価で危険の少ない方法を検討した結果、硫酸酸洗を高
温で実施し、続いて乾燥させることなく高温水で洗浄す
ることによりスケール残りもなく表面も美麗になること
を見出し、本発明をなしとげた。Therefore, the present inventors investigated an inexpensive and less dangerous method of finishing the surface beautifully instead of using a mixed solution of nitric acid and fluoride, which is expensive and has the risk of generating harmful gases. They discovered that by washing with high-temperature water without drying, the surface becomes beautiful without any scale remaining, and the present invention was completed.
以下に本発明の数値的根拠を示す。The numerical basis of the present invention is shown below.
第1図はシ冒ットを投射したSUB 430鋼熱延焼鈍
板を種々の濃度、温度で1分酸洗し水洗後スケール残り
の有無などを調査した結果を示す図である。FIG. 1 is a diagram showing the results of acid pickling of SUB 430 steel hot rolled annealed plates onto which a pickling shot was projected for 1 minute at various concentrations and temperatures, and the presence or absence of scale remaining after washing with water was investigated.
図中で○印は脱スケール完了を、x印はスケール残シを
示している。以上の結果、50?/j以上、50℃以上
の硫酸で脱スケールが完了することがわかる。In the figure, the ○ mark indicates completion of descaling, and the x mark indicates scale remaining. The above result is 50? It can be seen that descaling is completed with sulfuric acid at a temperature of /j or higher and 50°C or higher.
第2図は脱スケールの完了した41仕上げの80843
0鋼を80℃−2001/Jの硫酸溶液中にて再酸洗し
、直ちに水洗し九場合の洗浄水温度と表面拡散反射率の
関係を示す図である。洗浄水の温度が45℃以上になる
とスマットが除去されて表面拡散反射率が上がり表面が
美麗になることがわかる。Figure 2 shows 80843 with 41 finish after descaling.
FIG. 3 is a diagram showing the relationship between the cleaning water temperature and the surface diffused reflectance when 0 steel was pickled again in a sulfuric acid solution at 80° C.-2001/J and immediately washed with water. It can be seen that when the temperature of the cleaning water is 45° C. or higher, smut is removed, the surface diffuse reflectance increases, and the surface becomes beautiful.
同じく第3図はム1仕上げで表面拡散反射率46優の5
O8430鋼を種々の温度の200P/j硫酸水溶液中
にて酸洗し、直ちに70℃の水にて洗浄した場合の酸温
度と表面拡散反射率の関係を示す図である。酸温度が6
5℃未満になると表面拡散反射率の上昇は小さくなり効
果が小さくなることがわかる。Similarly, Figure 3 shows a surface diffused reflectance of 46 excellent with a Mu1 finish.
It is a figure showing the relationship between acid temperature and surface diffused reflectance when O8430 steel is pickled in 200P/j sulfuric acid aqueous solution at various temperatures and immediately washed with 70°C water. acid temperature is 6
It can be seen that when the temperature is lower than 5° C., the increase in surface diffuse reflectance becomes smaller and the effect becomes smaller.
以上水したとおり、Cr系ステンレス鋼では、高温の硫
酸で酸洗した後高温の水で洗浄することによって脱スケ
ールが完了し、かつ表面拡散反射率も高い処理を行なう
ことができる。なお、脱スケール後!!!面を白く仕上
げるだけの処理であれば101−74以上の硫酸でよい
ことが確認された。As mentioned above, with Cr stainless steel, descaling is completed by pickling with high-temperature sulfuric acid and then washing with high-temperature water, and a treatment with high surface diffuse reflectance can be performed. In addition, after descaling! ! ! It was confirmed that sulfuric acid of 101-74 or higher is sufficient if the treatment is to simply finish the surface white.
次に本発明における温度、濃度などの限定理由を述べる
。Next, the reasons for limiting the temperature, concentration, etc. in the present invention will be described.
硫酸濃度は第1図に従い脱スケールの完了する501−
/!、以上としえ。また、500 P/Jを超えて本効
果がそれ程変わらないうえ、より高温高濃度では粒界腐
食の危険が発生するので50(1/)を上限としな。The sulfuric acid concentration is adjusted according to Figure 1 when descaling is completed.
/! , that's all. In addition, the effect does not change much when the amount exceeds 500 P/J, and there is a risk of intergranular corrosion at higher temperatures and concentrations, so 50 (1/) is not the upper limit.
硫酸の温度は、第3図に示したとおシロ5℃未満ではス
マットの除去が不完全となシ表面拡散反射率の値が小さ
くなるので下限とした。The temperature of the sulfuric acid was set at the lower limit as shown in FIG. 3, because if it was less than 5°C, smut removal would be incomplete and the value of the surface diffuse reflectance would be small.
洗浄水の水温はII!2図に示したとおシロ5℃未満で
はスマットの除去が困難となりi面拡散反射率の値が小
さくなる丸め、45℃を下限とした。The temperature of the washing water is II! As shown in Fig. 2, it is difficult to remove smut and the value of the i-plane diffuse reflectance becomes small at temperatures below 5°C.The lower limit was set at 45°C.
ま九酸洗後水洗までに乾燥させるとスマットが強固に付
着して除去が不可能となるので酸洗から水洗までは乾燥
させないことを必要条件とした。Furthermore, if the material is dried after pickling and before water washing, smut will adhere firmly and become impossible to remove, so it was necessary to avoid drying between pickling and water washing.
次に実施例および比較例を示してさらに説明する。Next, further explanation will be given by showing examples and comparative examples.
実施例1
通常に熱延焼鈍した5US43G鋼板にシ冒ットを投射
した後、種々の条件の硫酸酸洗を行なり九。Example 1 After jetting a hot-rolled and annealed 5US43G steel plate, the steel sheets were subjected to sulfuric acid pickling under various conditions.
その結果を第1表に示したが、本発明方法では、硝酸と
弗酸の混合溶液を用いることなく脱スケールが完了しか
つ表面拡散反射率も高いことがわかる。これに対して比
較方法では硝酸と弗酸の溶合溶液でさらに酸洗する以外
はスケールが残ったシ、表面にスマットが残って表面の
美麗さを損っている。The results are shown in Table 1, and it can be seen that in the method of the present invention, descaling is completed without using a mixed solution of nitric acid and hydrofluoric acid, and the surface diffused reflectance is also high. On the other hand, in the comparative method, scale remained and smut remained on the surface, impairing the beauty of the surface, except for further pickling with a mixed solution of nitric acid and hydrofluoric acid.
焼鈍したBUS 410鋼板を3嘔以上圧下々の条件の
硫酸酸洗を行な2九、+
表に示し九が、本発明方法では脱ス
しかつ表面にスマットの付着がない
反射率も高いことがわかる。Annealed BUS 410 steel plates were subjected to sulfuric acid pickling under conditions of pressure of 300 or more.29+ As shown in the table, the method of the present invention removes sludge and has a high reflectance with no smut adhering to the surface. I understand.
な説明
ショットを投射したSUB 43 G調熱々の濃度で1
分酸洗し水洗後スケ−
々どを調査した結果を示す図、第2
ルの完了した41仕上げの8U843020011/l
の硫酸溶液中で酸洗し、た場合の洗浄水温度と表面拡散
反射
示す図、第3図はA1仕上げで表面
6チのSUS 430鋼を11にの温度の酸水溶液中に
て酸洗し、直ちに70
浄した場合の酸温度と表面拡散反射
示す図である・
1出願人 新日本製鐵株式會社
第7回
礒献泌度E′C〕
第2回
水/f温度〔°C〕・SUB 43 with a hot explanatory shot of G tone 1
Diagram showing the results of investigating the scale after pickling and water washing, 8U843020011/l of completed 41 finish in the second round.
Figure 3 shows the cleaning water temperature and surface diffused reflection when pickling in a sulfuric acid solution at a temperature of , is a diagram showing the acid temperature and surface diffused reflection when immediately cleaned at 70°C. 1 Applicant: Nippon Steel Corporation 7th acid secretion E'C] 2nd water/f temperature [°C]
Claims (1)
下の濃度で65℃以上の温度の硫酸中にて酸洗後、乾燥
させることなく45℃以上の水中にて洗浄することを特
徴とするCr系ステンレス鋼の脱スケール方法。Is Cr stainless steel more than Sol/j soO? A method for descaling Cr-based stainless steel, which comprises pickling in sulfuric acid at a concentration of /7 or less and a temperature of 65°C or higher, followed by washing in water at 45°C or higher without drying.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17651781A JPS5881979A (en) | 1981-11-05 | 1981-11-05 | Method for descaling cr containing stainless steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17651781A JPS5881979A (en) | 1981-11-05 | 1981-11-05 | Method for descaling cr containing stainless steel |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5881979A true JPS5881979A (en) | 1983-05-17 |
JPS639023B2 JPS639023B2 (en) | 1988-02-25 |
Family
ID=16015003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17651781A Granted JPS5881979A (en) | 1981-11-05 | 1981-11-05 | Method for descaling cr containing stainless steel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5881979A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS624891A (en) * | 1985-07-02 | 1987-01-10 | Nippon Steel Corp | Smut processing device for stainless steel strip |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54112730A (en) * | 1978-02-24 | 1979-09-03 | Sumitomo Metal Ind Ltd | Smut removing method |
-
1981
- 1981-11-05 JP JP17651781A patent/JPS5881979A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54112730A (en) * | 1978-02-24 | 1979-09-03 | Sumitomo Metal Ind Ltd | Smut removing method |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS624891A (en) * | 1985-07-02 | 1987-01-10 | Nippon Steel Corp | Smut processing device for stainless steel strip |
JPH0440433B2 (en) * | 1985-07-02 | 1992-07-02 | Nippon Steel Corp |
Also Published As
Publication number | Publication date |
---|---|
JPS639023B2 (en) | 1988-02-25 |
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