JPS6125783B2 - - Google Patents
Info
- Publication number
- JPS6125783B2 JPS6125783B2 JP4906880A JP4906880A JPS6125783B2 JP S6125783 B2 JPS6125783 B2 JP S6125783B2 JP 4906880 A JP4906880 A JP 4906880A JP 4906880 A JP4906880 A JP 4906880A JP S6125783 B2 JPS6125783 B2 JP S6125783B2
- Authority
- JP
- Japan
- Prior art keywords
- pickling
- sulfuric acid
- hot
- rolled
- acid solution
- 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
- 238000005554 pickling Methods 0.000 claims description 51
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 46
- 239000000243 solution Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 22
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 14
- 229910017604 nitric acid Inorganic materials 0.000 claims description 14
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 12
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 claims description 7
- 229910000360 iron(III) sulfate Inorganic materials 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 229910001566 austenite Inorganic materials 0.000 claims 1
- CBXWGGFGZDVPNV-UHFFFAOYSA-N so4-so4 Chemical compound OS(O)(=O)=O.OS(O)(=O)=O CBXWGGFGZDVPNV-UHFFFAOYSA-N 0.000 description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000010306 acid treatment Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 235000003891 ferrous sulphate Nutrition 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 2
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XWROUVVQGRRRMF-UHFFFAOYSA-N F.O[N+]([O-])=O Chemical compound F.O[N+]([O-])=O XWROUVVQGRRRMF-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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)
Description
本発明はオーステナイト系ステンレス鋼熱延板
の酸洗方法に係り、特に硫酸第二鉄―硫酸浴によ
る酸洗を効果的に行なわしめるとともに、酸洗後
の表面性状を良好ならしめたオーステナイト系ス
テンレス鋼熱延板の酸洗方法に関する。
熱間圧延および溶体化熱処理などの熱履歴を受
けたオーステナイト系ステンレス鋼熱延板の表面
に生成したスケールを連続酸洗ラインで除去する
方法としては、一般にシヨツトプラストにより機
械的に予備脱スケールを施したのち、硝酸―弗酸
溶液中で酸洗する方法が広く採用されている。こ
の硝酸―弗酸の混酸による酸洗法は表面仕上がり
状態がとりわけ良好であるが、NOxガスを多量
に発生するため公害上重大な問題となつている。
このためNOxガスを浄化処理する高価な設備を
必要とするばかりでなく、その運転コストは公害
規制の強化とともにますます増大しているのが実
情である。また、この混酸は液の老化がはやいた
め、頻繁に液の更新が必要となり、廃酸処理や浴
の管理が面倒であるという欠点を有する。
このような実情にかんがみ、NOxガスを発生
しない酸洗性能の優れた酸洗方法が切望され、い
くつかの提案がなされている。その一方法として
硫酸第二鉄―硫酸溶液による酸洗方法が知られて
いる。
しかしながら、この酸洗液においても銅帯の連
続酸洗法では酸洗に長時間を要するため、長大な
浴槽を必要とし実用的でないだけでなく、硫酸第
二鉄および硫酸の濃度範囲が極めてせまく、硫酸
第二鉄濃度の管理が困難であつて実用分野は限定
され、さらには被酸洗材の表面状況によつては仕
上がり面の色調不良や耐銹性の劣化を招くほか、
時として酸洗が全く不能な状態となることがあ
り、信頼性に重大な問題を残していた。
本発明者らはオーステナイト系ステンレス鋼熱
延板を硫酸第二鉄―硫酸溶液で酸洗した場合に認
められる上記諸欠点を解消するため、種々研究を
重ねた結果、既に前処理として硫酸処理を施すこ
とによつて速やかにかつ安定して酸洗を行ないう
ることを発見し、この前処理としての硫酸処理を
含む酸洗方法を特願昭54−157396号として提案し
た。本発明は前記提案を更に研究した結果なされ
たものであつて、前記提案に従う酸洗の後、後処
理として硝酸中で酸洗するかあるいは塩酸後硝酸
中で酸洗することにより更に良好な酸洗仕上りの
面の得られることを知見し、完成されたものであ
る。
すなわち本発明の要旨は、オーステナイト系ス
テンレス鋼熱延板の酸洗に際し、該熱延板を下記
(a)および(b)式を満足する条件下の硫酸溶液に浸漬
して表面を活性化した後、硫酸第二鉄と硫酸の混
合溶液に浸漬してスケールおよび表層の地金を溶
解除去し、ついで５〜20wt％、液温20〜70℃の
硝酸溶液に10〜120秒浸漬して仕上げることを特
徴とするオーステナイト系ステンレス鋼熱延板の
酸洗方法にある。
Ｃ×Ｔ≧200……(a)
Ｃ≧５ ……(b)
ここにＣ：硫酸をH2SO4としての重量百分率
（％）
Ｔ：液温（℃）
また本発明の他の要旨は、オーステナイト系ス
テンレス鋼熱延板の酸洗に際し、該熱延板を上記
(a)および(b)式を満足する条件下の硫酸溶液に浸漬
して表面を活性化した後、硫酸第二鉄と硫酸の混
合溶液に浸漬してスケールおよび表層の地金を溶
解除去し、ついで10〜25wt％，液温50〜90℃の
塩酸溶液に30〜120秒浸漬した後、５〜20wt％，
液温20〜70℃の硝酸溶液に10〜120秒浸漬して仕
上げることを特徴とするオーステナイト系ステン
レス鋼の酸洗方法にある。
以下、本発明を更に詳説する。既に特願昭54−
157396号明細書に詳述した如く、本発明者らは、
シヨツトプラスト処理されたオーステナイト系ス
テンレス鋼の熱延鋼板を用いて、該熱延鋼板を単
に硫酸第二鉄―硫酸浴に浸漬した場合および前処
理として硫酸浴に浸漬した後、硫酸第二鉄―硫酸
浴に浸漬した場合について酸洗性を試験し、前処
理としての硫酸浸漬の効果を調べた結果、硫酸第
二鉄―硫酸溶液で酸洗するに先立ち、硫酸溶液で
前処理するに際し、硫酸の濃度ｃ（重量％）と液
温Ｔ（℃）が上記(a)および(b)式を満足する場合に
速やかで、かつ安定した酸洗が行ないうることを
確認している。
本発明者らは、更に研究の結果、硫酸で前処理
し、次いで硫酸第二鉄―硫酸浴で酸洗ののち、さ
らに硝酸溶液中に浸漬すると、酸洗後の表面仕上
がり白色度および耐銹性が向上し、極めて良好な
表面性状となることを見出した。
第１表は、シヨツトプラストされたSUS304熱
延溶体化処理板を、硫酸（10wt％H2SO4，60
℃，5sec）で前処理後、硫酸第二鉄―硫酸溶
（10wt％Fe2（SO4）3―15wt％H2SO4，80℃，
60sec）で実質的に酸洗し、その後同表に示す各
種硝酸酸洗条件で後処理を施した時の表面性状試
験結果を示すものであり、後処理としてて硝酸溶
液に浸漬すると、表面白色度が向上するとともに
キヤス試験での耐銹性が改善されることがわか
る。
硝酸酸洗条件は、５〜20wt％，液温20〜70℃
の硝酸溶液に10〜120秒浸漬する必要があり、
各々下限未満では白色度および耐銹性の改善効果
がなく、上限を超えてはNOxガスが多発して環
境上好ましくなく、かつ、白色度も低下する。
The present invention relates to a pickling method for hot-rolled austenitic stainless steel sheets, and particularly to a method for pickling hot-rolled austenitic stainless steel sheets, which effectively performs pickling in a ferric sulfate-sulfuric acid bath and improves the surface quality after pickling. This invention relates to a pickling method for hot rolled steel sheets. A method for removing scale formed on the surface of hot-rolled austenitic stainless steel sheets that has undergone thermal history such as hot rolling and solution heat treatment using a continuous pickling line is generally to perform preliminary descaling mechanically using shotplast. After that, a method of pickling in a nitric acid-hydrofluoric acid solution is widely adopted. This pickling method using a mixed acid of nitric acid and hydrofluoric acid produces a particularly good surface finish, but it generates a large amount of NOx gas, which poses a serious problem in terms of pollution.
For this reason, not only is expensive equipment required to purify NOx gas, but the operating cost is increasing as pollution regulations become stricter. In addition, this mixed acid has the disadvantage that the liquid ages quickly, requiring frequent replacement of the liquid, and that waste acid treatment and bath management are troublesome. In view of these circumstances, there is a strong need for a pickling method with excellent pickling performance that does not generate NOx gas, and several proposals have been made. As one method, a pickling method using a ferric sulfate-sulfuric acid solution is known. However, even with this pickling solution, continuous pickling of copper strips takes a long time, requires a long bathtub, and is not only impractical, but also has an extremely narrow concentration range of ferric sulfate and sulfuric acid. However, it is difficult to control the concentration of ferric sulfate, which limits its practical use.Furthermore, depending on the surface condition of the material to be pickled, it may lead to poor color tone on the finished surface and deterioration of rust resistance.
In some cases, pickling was not possible at all, leaving serious problems with reliability. The present inventors have conducted various studies in order to eliminate the above-mentioned drawbacks observed when hot-rolled austenitic stainless steel sheets are pickled with a ferric sulfate-sulfuric acid solution. They discovered that pickling could be carried out quickly and stably by applying this method, and proposed a pickling method including sulfuric acid treatment as a pretreatment in Japanese Patent Application No. 157396/1982. The present invention was made as a result of further research on the above-mentioned proposal. After pickling according to the above-mentioned proposal, pickling in nitric acid as a post-treatment or pickling in nitric acid after hydrochloric acid improves the acidity. It was completed after discovering that a surface with a washed finish can be obtained. That is, the gist of the present invention is that when pickling an austenitic stainless steel hot-rolled sheet, the hot-rolled sheet is treated as follows.
After activating the surface by immersing it in a sulfuric acid solution under conditions that satisfy formulas (a) and (b), it is immersed in a mixed solution of ferric sulfate and sulfuric acid to dissolve and remove scale and surface metal. A pickling method for a hot rolled austenitic stainless steel sheet is then completed by immersing it in a nitric acid solution containing 5 to 20 wt% and a liquid temperature of 20 to 70°C for 10 to 120 seconds. C×T≧200……(a) C≧5……(b) where C: Weight percentage of sulfuric acid as H 2 SO 4 (%) T: Liquid temperature (°C) Other gist of the present invention is , When pickling an austenitic stainless steel hot-rolled sheet, the hot-rolled sheet is treated as described above.
After activating the surface by immersing it in a sulfuric acid solution under conditions that satisfy formulas (a) and (b), it is immersed in a mixed solution of ferric sulfate and sulfuric acid to dissolve and remove scale and surface metal. , then immersed in a hydrochloric acid solution with a liquid temperature of 50 to 90°C for 30 to 120 seconds, and then 5 to 20 wt%,
A pickling method for austenitic stainless steel is characterized by finishing the process by immersing it in a nitric acid solution at a temperature of 20 to 70°C for 10 to 120 seconds. The present invention will be explained in more detail below. Patent application already filed in 1978
As detailed in the specification of No. 157396, the present inventors
Using a shotplast-treated austenitic stainless steel hot-rolled steel sheet, when the hot-rolled steel sheet is simply immersed in a ferric sulfate-sulfuric acid bath, and after being immersed in a sulfuric acid bath as a pretreatment, As a result of testing the pickling property when immersed in a bath and investigating the effect of immersion in sulfuric acid as a pretreatment, it was found that prior to pickling with a ferric sulfate-sulfuric acid solution, It has been confirmed that rapid and stable pickling can be performed when the concentration c (wt%) and liquid temperature T (°C) satisfy the above equations (a) and (b). As a result of further research, the present inventors found that pretreatment with sulfuric acid, then pickling in a ferric sulfate-sulfuric acid bath, and further immersion in a nitric acid solution improved the whiteness of the surface finish after pickling and the rust resistance. It has been found that the surface properties are improved and the surface quality is extremely good. Table 1 shows that shot-blasted SUS304 hot-rolled solution-treated plates were treated with sulfuric acid (10wt% H 2 SO 4 , 60
After pretreatment at 80℃, 5 seconds), ferric sulfate-sulfuric acid solution (10wt%Fe 2 (SO 4 ) 3 -15wt%H 2 SO 4 , 80℃,
This table shows the surface property test results obtained when the surface was pickled (60 sec) and then post-treated under various nitric acid pickling conditions shown in the same table. It can be seen that as the corrosion resistance improves, the rust resistance in the cast test also improves. Nitric acid pickling conditions are 5-20wt%, liquid temperature 20-70℃
need to be immersed in nitric acid solution for 10-120 seconds,
If each is below the lower limit, there is no effect of improving whiteness and rust resistance, and if it exceeds the upper limit, NOx gas will be produced frequently, which is environmentally unfavorable, and the whiteness will also decrease.
【表】【table】
【表】
更にこの硝酸処理に先立つて塩酸酸洗すること
により表面仕上がり白色度および耐銹性が一層向
上することが判明した。塩酸酸洗条件は、10〜
25wt％，液温50〜90℃の塩酸に30〜120秒浸漬す
る必要があり、各々下限未満では白色度および耐
銹性の改善効果がなく、上限を超えては酸洗ロス
が大きくなり、過酸洗となる。
第２表は、シヨツトブラストされたSUS304熱
延溶体処理板を、硫酸（10wt％H2SO4，60℃，
5sec）で前処理後、硫酸第二鉄―硫酸浴（10wt
％Fe2（SO4）3―15wt％H2SO4，80℃，60sec）で
実質的に酸洗し、その後同表に示す塩酸→硝酸酸
洗条件で後処理を施した時の表面性状試験結果を
示すものであり、後処理として塩酸溶液に浸漬後
硝酸溶液に浸漬すると、表面の色調が極めて良好
となり、同時にキヤス試験における耐銹性も著し
く改善されることが確認された。[Table] Furthermore, it was found that the whiteness of the surface finish and the rust resistance were further improved by pickling with hydrochloric acid prior to the nitric acid treatment. Hydrochloric acid pickling conditions are 10~
It is necessary to immerse the product in hydrochloric acid containing 25 wt% and a liquid temperature of 50 to 90℃ for 30 to 120 seconds. Below the lower limits, there is no improvement in whiteness and rust resistance, and above the upper limits, pickling loss increases. This will result in over-pickling. Table 2 shows that shot-blasted SUS304 hot-rolled solution-treated sheets were treated with sulfuric acid (10wt% H 2 SO 4 , 60℃,
After pretreatment in ferric sulfate-sulfuric acid bath (10wt)
%Fe 2 (SO 4 ) 3 -15wt%H 2 SO 4 , 80°C, 60 sec), and then post-treated under the hydrochloric acid → nitric acid pickling conditions shown in the same table. The test results show that it was confirmed that when the material is immersed in a hydrochloric acid solution and then in a nitric acid solution as a post-treatment, the surface color tone becomes extremely good, and at the same time, the rust resistance in the cast test is also significantly improved.
【表】【table】
【表】
本発明を実施するにあたつては、前処理として
の硫酸浴処理と硫酸第二鉄―硫酸浴処理との間で
被酸洗材表面が極度に乾燥しないように注意する
必要があるが、硫酸前処理後の水スプレーの使用
については特に限定するものではない。実質的な
酸洗が行われる硫酸第二鉄―硫酸浴では被酸洗材
の鋼種およびスケールの状態などにより、予めそ
れらの濃度および液温を適宜決めて酸洗を行う。
また、硫酸第二鉄―硫酸浴では酸洗処理量ととも
に硫酸第二鉄および硫酸が消費され、一方硫酸第
一鉄、硫酸クロム、硫酸ニツケなどが蓄積濃化し
てくるので、適宜硫酸の添加と硫酸第一鉄を硫酸
第二鉄に酸化復元するための酸化剤として過酸化
水素、酸素、空気などを浴中に導入するほか、前
記硫酸第一鉄、硫酸クロム、硫酸ニツケルを適当
に除去することによつて安定した酸洗性能を保持
できる。
以下、本発明を実施例によつてさらに説明す
る。
実施例 １
通常の条件で熱延および溶体化熱処理を施した
SUS304ホツトコイルを連続酸洗ラインで第３表
に示すＡ，Ｂ，Ｃ，Ｄ，Ｅ，Ｆの各酸洗法により
酸洗を行なつた。ホツトコイルを酸洗したあとの
白色度およびキヤス試験による耐銹性は第３表に
示すごとくであり、本発明法に従うＡ，Ｂの酸洗
方法のホツトコイルは、従来酸洗方法のものに比
べ白色度および耐銹性が著しく改善された。また
酸洗方法がＡのホツトコイルはJIS Ｇ 4305に規
定されるNo.2BおよびBAの各仕上げに、Ｂのホ
ツトコイルは同じくNo.2BおよびNo.2D仕上げに
それぞれ支障なく適用することができた。[Table] When carrying out the present invention, care must be taken to prevent the surface of the pickled material from becoming extremely dry between the sulfuric acid bath treatment as pretreatment and the ferric sulfate-sulfuric acid bath treatment. However, the use of water spray after sulfuric acid pretreatment is not particularly limited. In the ferric sulfate-sulfuric acid bath where substantial pickling is performed, the concentration and liquid temperature are determined in advance depending on the steel type and scale condition of the material to be pickled.
In addition, in a ferric sulfate-sulfuric acid bath, ferric sulfate and sulfuric acid are consumed along with the amount of pickling treatment, while ferrous sulfate, chromium sulfate, nickel sulfate, etc. accumulate and concentrate, so it is necessary to add sulfuric acid as appropriate. In addition to introducing hydrogen peroxide, oxygen, air, etc. into the bath as an oxidizing agent to oxidize and restore ferrous sulfate to ferric sulfate, the ferrous sulfate, chromium sulfate, and nickel sulfate are appropriately removed. This allows stable pickling performance to be maintained. The present invention will be further explained below with reference to Examples. Example 1 Hot rolled and solution heat treated under normal conditions
SUS304 hot coils were pickled in a continuous pickling line using pickling methods A, B, C, D, E, and F shown in Table 3. The whiteness and rust resistance of the hot coils after pickling are as shown in Table 3, and the hot coils obtained by the pickling methods A and B according to the method of the present invention are whiter than those obtained by the conventional pickling method. The corrosion resistance and rust resistance were significantly improved. In addition, the hot coils using pickling method A could be applied to No. 2B and BA finishes specified in JIS G 4305, and the hot coils of B could be applied to No. 2B and No. 2D finishes without any problems.
【表】【table】
【表】
実施例 ２
通常の条件で熱延および溶体化熱処理を施した
４mm厚みのSUS316ホツトコイルを連続酸洗ライ
ンで第３表に示すＡ，Ｂの酸洗方法により酸洗
し、いずれも1.0mm厚みに冷延したのちNo.2Dお
よびNo.2Bに仕上げた。その結果は表面光沢むら
のない良好な表面性状をもつ鋼板が得られた。
本発明によれば、オーステナイト系ステンレス
鋼熱延板の酸洗に際して、NOxガスによる環境
汚染の心配がなく、排ガスおよび廃酸処理が極め
て有利となり、ひいてはステンレス鋼製造コスト
を低減できる利点がある。さらに得られる製品の
表面性状は耐銹性に富み同時に光沢むらがなく優
れている。
なお、この発明は帯、板状はもちろんのこと、
管や加工部品などあらゆる形状のオーステナイト
系ステンレス熱延鋼に広く適用し得るものであ
る。[Table] Example 2 A 4 mm thick SUS316 hot coil that had been hot-rolled and solution heat treated under normal conditions was pickled in a continuous pickling line using the pickling methods A and B shown in Table 3. After cold rolling to a thickness of mm, it was finished into No.2D and No.2B. As a result, a steel plate with good surface properties without uneven surface gloss was obtained. According to the present invention, when pickling hot-rolled austenitic stainless steel sheets, there is no concern about environmental pollution due to NOx gas, and exhaust gas and waste acid treatment are extremely advantageous, which has the advantage of reducing stainless steel manufacturing costs. Furthermore, the surface properties of the obtained product are excellent, with high rust resistance and no uneven gloss. In addition, this invention can be applied not only to belts and plates, but also to
It can be widely applied to all shapes of austenitic stainless hot rolled steel such as pipes and processed parts.
Claims (1)
いに際し、該熱延板を下記ａおよびｂ式を満足す
る条件下の硫酸溶液に浸漬して表面を活性化した
後、硫酸第二鉄と硫酸の混合溶液に浸漬してスケ
ールおよび表層の地金を溶解除去し、ついで５〜
20wt％，液温20〜70℃の硝酸溶液に10〜120秒浸
漬して仕上げることを特徴とするオーステナイト
系ステンレス鋼熱延板の酸洗方法。 Ｃ×Ｔ≧200……(a) Ｃ≧５ ……(b) ここにＣ：硫酸をH2SO4としての重量百分率
（％） Ｔ：液温（℃） ２ オーステナイト系ステンレス鋼熱延板の酸洗
いに際し、該熱延板を下記(a)および(b)式を満足す
る条件下の硫酸溶液に浸漬して表面を活性化した
後、硫酸第二鉄と硫酸の混合溶液に浸漬してスケ
ールおよび表層の地金を溶解除去し、ついで10〜
25wt％，液温50〜90℃の塩酸溶液に30〜120秒浸
漬した後、５〜20wt％，液温20〜70℃の硝酸溶
液に10〜120秒浸漬して仕上げることを特徴とす
るオーステナイト系ステンレス鋼熱延板の酸洗方
法。 Ｃ×Ｔ≧200……(a) Ｃ≧５ ……(b) ここにＣ：硫酸をH2SO4としての重量百分率
（％） Ｔ：液温（℃）[Claims] 1. When pickling an austenitic stainless steel hot-rolled plate, the hot-rolled plate is immersed in a sulfuric acid solution under conditions that satisfy formulas a and b below to activate the surface, and then the hot-rolled plate is immersed in a sulfuric acid solution under conditions that satisfy the following formulas a and b. The scale and surface metal are dissolved and removed by immersion in a mixed solution of diiron and sulfuric acid, and then
A pickling method for hot-rolled austenitic stainless steel sheets, characterized by finishing by immersing them in a nitric acid solution containing 20 wt% and a liquid temperature of 20 to 70°C for 10 to 120 seconds. C×T≧200……(a) C≧5……(b) where C: Weight percentage of sulfuric acid as H 2 SO 4 (%) T: Liquid temperature (°C) 2 Austenitic stainless steel hot rolled sheet When pickling, the hot rolled sheet is immersed in a sulfuric acid solution under conditions that satisfy formulas (a) and (b) below to activate the surface, and then immersed in a mixed solution of ferric sulfate and sulfuric acid. The scale and surface metal are dissolved and removed, and then 10~
Austenite that is finished by immersing it in a 25 wt% hydrochloric acid solution at a temperature of 50 to 90°C for 30 to 120 seconds, and then immersing it in a 5 to 20 wt% nitric acid solution at a temperature of 20 to 70°C for 10 to 120 seconds. Pickling method for hot-rolled stainless steel sheets. C×T≧200……(a) C≧5……(b) where C: Weight percentage of sulfuric acid as H 2 SO 4 (%) T: Liquid temperature (℃)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4906880A JPS56146882A (en) | 1980-04-14 | 1980-04-14 | Pickling method for hot rolled sheet of austenitic stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4906880A JPS56146882A (en) | 1980-04-14 | 1980-04-14 | Pickling method for hot rolled sheet of austenitic stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56146882A JPS56146882A (en) | 1981-11-14 |
| JPS6125783B2 true JPS6125783B2 (en) | 1986-06-17 |
Family
ID=12820755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4906880A Granted JPS56146882A (en) | 1980-04-14 | 1980-04-14 | Pickling method for hot rolled sheet of austenitic stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56146882A (en) |
-
1980
- 1980-04-14 JP JP4906880A patent/JPS56146882A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56146882A (en) | 1981-11-14 |
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