JPS58126993A - Molten salt bath for continuous annealing and pickling device - Google Patents
Molten salt bath for continuous annealing and pickling deviceInfo
- Publication number
- JPS58126993A JPS58126993A JP921082A JP921082A JPS58126993A JP S58126993 A JPS58126993 A JP S58126993A JP 921082 A JP921082 A JP 921082A JP 921082 A JP921082 A JP 921082A JP S58126993 A JPS58126993 A JP S58126993A
- Authority
- JP
- Japan
- Prior art keywords
- salt bath
- molten salt
- taken out
- amount
- 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.)
- 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
- C23G1/28—Cleaning or pickling metallic material with solutions or molten salts with molten salts
- C23G1/32—Heavy metals
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】
本発明はステンレス鋼帯などの連続式焼鈍酸洗工程にお
いて使用される溶融塩浴に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to molten salt baths used in continuous annealing and pickling processes for stainless steel strip and the like.
ステンレス鋼やチタンなどの薄板を所謂ストリップ方式
で製造する場合には、通常帯状の中間製品を連続的に焼
鈍、酸洗する工程が行なわれるが、この場合、焼鈍工程
で生じた緻密な酸化スクールを直接酸洗によって除去し
ようとすると、酸化スケールを充分に除去するOK長時
間t−要し、かつ表面が肌荒れした製品ができることが
多い。このため酸洗の前に、水酸化ナトリウムを主成分
とする溶融塩浴中に通板する工程が通常行なわれ、これ
によって酸化度の不均一なスケールはさらに酸化されて
、酸に溶けやすい形に変わル、短時間の酸洗によって除
去されて表面状態の良い製品ができるのである。When manufacturing thin sheets of stainless steel, titanium, etc. using the so-called strip method, a strip-shaped intermediate product is usually continuously annealed and pickled. If an attempt is made to directly remove the oxidized scale by pickling, it takes a long time to sufficiently remove the oxide scale, and often results in a product with a rough surface. For this reason, before pickling, a process is usually carried out in which the plate is passed through a molten salt bath containing sodium hydroxide as its main component, and as a result, scales with uneven degrees of oxidation are further oxidized to forms that are easily soluble in acids. Instead, they can be removed by a short pickling process, resulting in a product with a good surface condition.
このような脱スクール能のすぐれた溶融塩浴剤としては
、従来よjj) DG8ンルトと謂われるNaN019
〜15 % 、Na0j 5〜15 % 、 iOH8
〜20 %、 NaOH50〜78−よシ成る溶融塩浴
などが知られ、ステンレス鋼などの脱スケールに用いら
れている。Conventionally, as a molten salt bath agent with excellent decooling ability, there is NaN019, which is called DG8.
~15%, Na0j 5~15%, iOH8
A molten salt bath consisting of NaOH 50-20% and NaOH 50-78% is known, and is used for descaling stainless steel and the like.
本発明者らはステンレス銅帯を連続的に溶融塩浴で処理
する場合に、銅帯に付着して浴外に持ち出されて失われ
る量(持ち出し量)が多く、これがコストアップの原因
となっていることに注目し、持ち出し量に関する詳細な
研究を行なった結果、従来の溶融塩浴に比べて、持ち出
し量が大幅に少ない溶融塩浴を発明することに成功した
ものである。The present inventors found that when stainless steel copper strips are continuously treated in a molten salt bath, a large amount of copper is attached to the copper strips and is carried out of the bath and is lost (amount carried out), which causes an increase in costs. After paying attention to this fact and conducting detailed research on the amount of outflow, they succeeded in inventing a molten salt bath that has a much smaller amount of outflow than conventional molten salt baths.
即ち、本発明はNaOHt−主成分とし、これに10〜
40%のNaNO3及び5〜20%のKOHを加えた本
のを基本組成とした上、不純物として混入するN a2
003 を2−以下に制限すれば450℃以下の温度
で使用した場合に持ち出し量が従来の塩浴に比べて大幅
に少ないこと倉知見し九結果に基くものである。That is, in the present invention, NaOHt is the main component, and 10 to
The basic composition is a book containing 40% NaNO3 and 5-20% KOH, and Na2 mixed as an impurity.
This is based on our findings that if 003 is limited to 2- or less, the amount carried out will be significantly smaller than in conventional salt baths when used at temperatures below 450°C.
前記のDG8ンルトは通常480〜500℃で使用され
ているが、熱経済上、浴の温度は出来る丈は下げること
が試みられている。しかし温度を下けると浴の粘性が増
し持ち出し量が増すことは避けられない。本発明の溶融
塩浴は450℃以下のような比較的低温で使用された場
合でも、従来の浴に比べて持ち出し量が少ないものであ
る。The above-mentioned DG8 bath is usually used at a temperature of 480 to 500°C, but attempts have been made to lower the temperature of the bath for thermoeconomic reasons. However, lowering the temperature inevitably increases the viscosity of the bath and increases the amount carried out. Even when the molten salt bath of the present invention is used at a relatively low temperature such as 450° C. or lower, the amount carried out is smaller than that of conventional baths.
次に本発明にか\る溶融塩浴の成分を限定した理由を述
べ、併せて本発明の特徴について説明する。Next, the reason for limiting the components of the molten salt bath according to the present invention will be described, and the characteristics of the present invention will also be explained.
N a N Osは酸化剤として働き、酸化度の不充分
なスケールを酸化するために必要であシ、その添加′I
IkFi処理しようとする材料の種類によって異なるが
、一般に10−以下では浴の酸化能力解しやすくなる。N a N Os acts as an oxidizing agent and is necessary to oxidize scales with insufficient oxidation degree.
Although it varies depending on the type of material to be treated with IkFi, in general, when it is less than 10, the oxidizing ability of the bath becomes easier to understand.
一方、持ち出し量に関しては第1図に示すように10〜
40%の範囲で、殆んど持ち出し量に差がないのでNa
NO3の量は10〜40%とする。On the other hand, as for the amount taken out, as shown in Figure 1, 10~
Within the range of 40%, there is almost no difference in the amount taken out, so Na
The amount of NO3 is 10-40%.
KOHはNaOHと同じく酸化スケール中のクロムをク
ロム酸塩として溶融するのに必要なアルカリであるが、
第2図に示すように添加量5〜20嘩の範囲で持ち出し
量を減らす効果を有し、またこの範囲より多くても少く
ても持ち出し量は増える。従ってその添加範囲を5〜2
0嘩と塩として溶融するのに必要なアルカリであシ、K
OHとの合計量が50−以上であれば充分である。KOH, like NaOH, is an alkali necessary to melt chromium in oxide scale as chromate, but
As shown in FIG. 2, an amount added in the range of 5 to 20% has the effect of reducing the amount taken out, and an amount greater or less than this range increases the amount taken out. Therefore, the addition range is 5 to 2
The alkali necessary to melt the salt as
It is sufficient if the total amount with OH is 50 or more.
ネ
なお、 N ai O03は添加されるものではなく、
不純物として混入するか塩浴が空気中のCOtガスを吸
収することによシ生成するもOであるがその量が増加す
るにつれて第5図に示すように持ち出し量が増加する。Note that N ai O03 is not added,
O is mixed as an impurity or is generated when the salt bath absorbs COt gas in the air, but as its amount increases, the amount taken out increases as shown in FIG.
%に2−を超えると急激に持ち出し量が増加するのでそ
の量を2−以下に制限する。If the percentage exceeds 2-, the amount taken out increases rapidly, so the amount is limited to 2- or less.
前記のDG8ンルトでは溶融塩浴O粘度を下げるために
10Is前後のNaC4が添加されているが、第4図に
示すように塩浴の温度が480℃の場合にriMao#
o〜10%の範囲で僅かに持ち出し量が減少するか、4
50℃の場合には逆効果となり、添加量が増すにつれて
持ち出し量が増加し、特にMa(!1104以上では急
激に持ち出し量が多くなるのでMaCA Fi添加しな
い方がよいことを知見した。第5図はMaCA O%、
5チ% 10チの塩浴の持ち出し量が温度によってどう
変るかを示したものであシ、この図よシ明らかなように
浴温か450℃以下ではMaCjO−の浴が最も持ち出
し量か少ない。In the DG8 solution mentioned above, around 10 Is of NaC4 is added to lower the viscosity of the molten salt bath, but as shown in Figure 4, when the temperature of the salt bath is 480°C, riMao#
The amount taken out will decrease slightly in the range of o to 10%, or 4
In the case of 50°C, the opposite effect occurs, and as the amount added increases, the amount carried out increases, and in particular, it was found that it is better not to add MaCA Fi because the amount carried out increases rapidly at Ma (! The figure shows MaCA O%,
This figure shows how the amount taken out of a 5% to 10% salt bath changes depending on the temperature. As is clear from this figure, when the bath temperature is below 450°C, the MaCjO- bath has the smallest amount taken out.
本発明は前述の知見に基いてNa0jを含有しないで、
NaOH、KOH、NaN0gを所定の範囲とするもの
である。Based on the above-mentioned findings, the present invention does not contain Na0j,
The predetermined ranges are 0 g of NaOH, KOH, and NaN.
以下に本発明の効果を実施例によって説明する。The effects of the present invention will be explained below using examples.
第1表に示すような組成を有する溶融塩浴につき450
℃及び450℃での持ち出し1iiIk測定した結果を
第2表及び第6図に示す。450 for a molten salt bath having a composition as shown in Table 1
Table 2 and FIG. 6 show the results of the carry-out 1iiik measurements at 450°C and 450°C.
第1表
第 2 表
上記溶融塩浴の持ち出し量O測定方法O概略は次の通υ
である。Table 1 Table 2 The amount taken out of the above molten salt bath O measurement method O outline is as follows υ
It is.
ステンレス鋼板の試験片(8U8 s O4、酸化溶融
塩浴中に10秒間浸漬した後引き上げ、デシケータ−中
で冷却後重量測定し、浸漬前後の重量差から持ち出し量
を求めたものである。本測定においては、測定精[を上
けるため、1回の重量測定には10枚の試験片をまとめ
て測定し、塩浴の温度は電源を自動的にコントロールす
る方式を採用してPt−Rh熱電対を用いて測定した。A stainless steel plate test piece (8U8s O4) was immersed in an oxidizing molten salt bath for 10 seconds, then pulled out, cooled in a desiccator, weighed, and the amount taken out was determined from the difference in weight before and after immersion.Main measurement In order to improve measurement accuracy, 10 test pieces were measured at once for one weight measurement, and the temperature of the salt bath was controlled using a Pt-Rh thermoelectric system that automatically controlled the power supply. It was measured using a pair.
また持ち出し量は板の引上は速度に大きく影響されるの
で試験片の引上げ速度を正確にコントロールするために
電動モータを用いて定速([189m/m1n)で引き
上げた。In addition, since the lifting amount of the plate is greatly affected by the speed, an electric motor was used to accurately control the pulling speed of the test piece, and the test piece was pulled at a constant speed (189 m/m1n).
第2表及び第6図よシ明らかなように本発明塩浴の持ち
出し量は何れの比較塩浴の持ち出し量よシ少ない。特に
450℃又は450℃においては比較塩浴の持ち出し量
は本発明塩浴のそれよシも5〜20チ多く、本発明塩浴
が450℃以下の比較的低温で使われる場合に有利であ
ることを示している。As is clear from Table 2 and FIG. 6, the amount taken out of the salt bath of the present invention is smaller than the amount taken out of any of the comparative salt baths. In particular, at 450°C or 450°C, the amount of take-out of the comparative salt bath is 5 to 20 more than that of the salt bath of the present invention, which is advantageous when the salt bath of the present invention is used at a relatively low temperature of 450°C or lower. It is shown that.
なお、本発明塩浴の脱スケール能力を確認するため、S
U85Ω4ステンレス鋼板試験片(α6 (e)X 5
0 Qf)X 50 (Avm )を電気炉中で110
0℃、80秒間焼鈍したものを430.450及び48
0℃の本発明塩浴中に10秒間 を浸漬した後水中
に投入し、60℃O15% HNO3−1−HP 酸洗
液で1分間酸洗後水洗、乾燥し光学顕微鏡でスケールの
有無を調べた。その結果を第3表に示す。In addition, in order to confirm the descaling ability of the salt bath of the present invention, S
U85Ω4 stainless steel plate test piece (α6 (e)
0 Qf)X 50 (Avm) in an electric furnace at 110
430.450 and 48 annealed at 0°C for 80 seconds
After immersing it in a salt bath of the present invention at 0°C for 10 seconds, it was put into water, and after pickling for 1 minute in a 60°C O 15% HNO3-1-HP pickling solution, it was washed with water, dried, and examined for the presence of scale using an optical microscope. Ta. The results are shown in Table 3.
第 5 表
第3表よシ明らかなように、何れの温度においてもスケ
ールは認められず、本発明塩浴が430〜480℃にお
いて充分な脱スケール能力を持つことを確認した。Table 5 As is clear from Table 3, no scale was observed at any temperature, confirming that the salt bath of the present invention had sufficient descaling ability at 430 to 480°C.
以上のように本発明塩浴は430〜480℃、特に45
0℃以下の比較的低温で使用される場合に持ち出し量が
少ないという特徴をもち、エネルギー削減の目的で産業
上非常に有益なものである。As mentioned above, the salt bath of the present invention can be heated at 430 to 480°C, especially at 45°C.
It has the characteristic that when used at a relatively low temperature of 0° C. or lower, the amount taken out is small, and is very useful industrially for the purpose of energy reduction.
添付図面において第1〜6図は本発明塩浴と待ち出し量
とO関係を示す図表である。In the accompanying drawings, FIGS. 1 to 6 are charts showing the relationship between the salt bath of the present invention, the amount of discharge, and O.
Claims (1)
0−5残部Na0E及び不純物よル成シ、不純物として
混入するMa*OO1含有量t2−以下とするととt特
徴とする連続式焼鈍酸洗装置用溶融塩浴。Weight - Mallollo ~4011, KOH5~2
A molten salt bath for continuous annealing and pickling equipment, characterized in that the content of Ma*OO1 mixed as impurities is t2- or less.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP921082A JPS6053755B2 (en) | 1982-01-23 | 1982-01-23 | Molten salt bath for continuous annealing pickling equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP921082A JPS6053755B2 (en) | 1982-01-23 | 1982-01-23 | Molten salt bath for continuous annealing pickling equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS58126993A true JPS58126993A (en) | 1983-07-28 |
JPS6053755B2 JPS6053755B2 (en) | 1985-11-27 |
Family
ID=11714098
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP921082A Expired JPS6053755B2 (en) | 1982-01-23 | 1982-01-23 | Molten salt bath for continuous annealing pickling equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6053755B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100576044B1 (en) * | 2001-12-22 | 2006-05-03 | 주식회사 포스코 | electrolytic pickling method in nitric acid to pickle the stainless steel |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0362059U (en) * | 1989-10-18 | 1991-06-18 |
-
1982
- 1982-01-23 JP JP921082A patent/JPS6053755B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100576044B1 (en) * | 2001-12-22 | 2006-05-03 | 주식회사 포스코 | electrolytic pickling method in nitric acid to pickle the stainless steel |
Also Published As
Publication number | Publication date |
---|---|
JPS6053755B2 (en) | 1985-11-27 |
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