JPH01247583A - Method for descaling internal surface of clad steel pipe - Google Patents
Method for descaling internal surface of clad steel pipeInfo
- Publication number
- JPH01247583A JPH01247583A JP7728088A JP7728088A JPH01247583A JP H01247583 A JPH01247583 A JP H01247583A JP 7728088 A JP7728088 A JP 7728088A JP 7728088 A JP7728088 A JP 7728088A JP H01247583 A JPH01247583 A JP H01247583A
- Authority
- JP
- Japan
- Prior art keywords
- internal surface
- steel pipe
- clad steel
- alloy
- scales
- 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
- 238000000034 method Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 23
- 239000010959 steel Substances 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910003271 Ni-Fe Inorganic materials 0.000 claims abstract description 6
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 238000005422 blasting Methods 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 5
- OBMBUODDCOAJQP-UHFFFAOYSA-N 2-chloro-4-phenylquinoline Chemical compound C=12C=CC=CC2=NC(Cl)=CC=1C1=CC=CC=C1 OBMBUODDCOAJQP-UHFFFAOYSA-N 0.000 claims description 26
- 238000005406 washing Methods 0.000 claims description 6
- 238000005554 pickling Methods 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 229910000975 Carbon steel Inorganic materials 0.000 abstract description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 3
- 239000010962 carbon steel Substances 0.000 abstract description 3
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 238000005253 cladding Methods 0.000 abstract 2
- 238000007605 air drying Methods 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 9
- 230000007797 corrosion Effects 0.000 description 9
- 239000007921 spray Substances 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000003389 potentiating effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【発明の詳細な説明】
（イ） 産業上の利用分野
本発明は、内面に高Ｎｉ−Ｆｅ合金を張り合せたクラッ
ド鋼管の内面脱スケール方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for descaling the inner surface of a clad steel pipe whose inner surface is laminated with a high Ni--Fe alloy.
く口） 従来技術
鋼管が熱処理や溶接をされたとき、その内面にスケール
が発生する。従来、内面クラッド鋼管の内面脱スケール
方法としては、第２図（Ａ）（Ｂ）に示すように２通り
の方法がある。その１つは、機械的にスケールを除去す
る方法である（（Ａ）図）。(Explanation) When conventional steel pipes are heat treated or welded, scale forms on their inner surfaces. Conventionally, there are two methods for descaling the inner surface of an inner clad steel pipe, as shown in FIGS. 2(A) and 2(B). One method is to mechanically remove scale (Figure (A)).
他の１つは、管内面側に酸洗液を封入し、所定時間鋼管
を回転させ、その間酸洗液とスケールとの間の化学的反
応を利用する方法である（（Ｂ）図）。Another method is to fill the inner surface of the pipe with a pickling solution, rotate the steel pipe for a predetermined period of time, and utilize a chemical reaction between the pickling solution and the scale during this time (Figure (B)).
ところが、機械的スケール除去方法の場合、管外径に制
約（最小直径１００＋ｗａ）があり、能率、コスト面に
おいても採算性が低いという難点があった。また化学的
スケール除去方法は、酸洗液（劇薬）の取扱い上非常に
問題があり、また、コストも高いため、採算性が低いと
いう難点があった。However, in the case of the mechanical scale removal method, there is a restriction on the outer diameter of the tube (minimum diameter of 100+ wa), and there is a drawback that profitability is low in terms of efficiency and cost. In addition, the chemical scale removal method has the disadvantage that it is very difficult to handle the pickling solution (potent chemical) and is also expensive, making it unprofitable.
（ハ） 発明が解決しようとする課題
本発明が解決しようとする課題は、内面クラッド鋼管の
内面脱スケール方法において、常に良好な耐食性が得ら
れ、コスト、能率面において採算性のとれる方法を得る
ことにある。(c) Problems to be Solved by the Invention The problems to be solved by the present invention are to provide a method for descaling the inner surface of internally clad steel pipes that consistently provides good corrosion resistance and is profitable in terms of cost and efficiency. There is a particular thing.
（ニ） 課題を解決するための手段
本発明の方法は、内面に高Ｎｉ−Ｆｅ合金を張り合せた
クラッド鋼管内面をＨＦ、ＨＮＯ３による酸洗剤を用い
て脱スケールする方法において、前記内面にショツトブ
ラストによる前処理を施すこと、該内面に下記の条件下
にある酸洗剤を塗布すること、該内面を水洗すること、
該鋼管を自然乾燥ごとからなる手段によって、上記課題
を解決している。(d) Means for Solving the Problems The method of the present invention is a method of descaling the inner surface of a clad steel pipe, the inner surface of which is laminated with a high Ni-Fe alloy, using an acid detergent of HF and HNO3. pre-treatment by blasting, applying an acid detergent under the following conditions to the inner surface, washing the inner surface with water,
The above-mentioned problem is solved by means of drying the steel pipe naturally.
前記酸洗剤の条件は、次記の範囲が好ましい。The conditions for the acid detergent are preferably in the following range.
ＨＦ・３．５〜５．０％
ＨＮＯ，＋１２〜１５％
粘性係数： ０．１０〜０．１５μｋｇｓ／ｍ適用温度
；５〜３５°Ｃ
（ホ）作用
内面クラッド鋼管の製造、熱処理、または溶接中に鋼管
内面に発生した金属酸化物（スケール）と除去する場合
に、常温で酸洗剤を脱スケール面に塗布し、完全に説ス
ケールをし、炭素鋼側に酸洗剤による影響を全く与えず
、さらに、内面側の耐食性能の確保ができる。HF・3.5~5.0% HNO, +12~15% Viscosity coefficient: 0.10~0.15 μkgs/m Applicable temperature: 5~35°C (e) Production, heat treatment, or welding of working inner clad steel pipes When removing metal oxides (scale) that occur on the inner surface of steel pipes, apply an acid detergent to the descaling surface at room temperature to completely remove scale, and the acid detergent does not affect the carbon steel side at all. Furthermore, corrosion resistance on the inner surface side can be ensured.
本発明法では、ある程度粘性を持たせた酸洗剤を使用し
、管の一端より酸洗剤をスプレ方式により管内面に塗布
し、一定の速度でスプレ・ヘッドを管の他端方向へ移動
させ、管内面全面に酸洗剤を塗布し、短時間処理にて良
好な耐食性を得る。In the method of the present invention, an acid detergent with a certain degree of viscosity is used, and the acid detergent is applied to the inner surface of the tube by a spray method from one end of the tube, and the spray head is moved toward the other end of the tube at a constant speed. Acid detergent is applied to the entire inner surface of the pipe to achieve good corrosion resistance in a short period of time.
（へ） 実施例
第４図は本発明法が対象とする内面クラッド鋼管の一部
縦断面図である。クラッド鋼管１は炭素鋼を母材１１と
し、母材１１の内面に高Ｎｉ−Ｆｅ３金からなる合ぜ材
１２を張り合せたものである。(f) Example FIG. 4 is a partial longitudinal sectional view of an inner clad steel pipe to which the method of the present invention is applied. The clad steel pipe 1 has a base material 11 made of carbon steel, and a bonding material 12 made of high Ni-Fe3 gold is laminated on the inner surface of the base material 11.
合せ材１２の上面にスケール１３が発生する。A scale 13 is generated on the upper surface of the laminated material 12.
第１図は本発明法の工程図を示す。まず、前処理工程２
１として、ショツトブラストによってスケールを完全に
除去する。次に、脱スケール面と酸洗剤との濡れ性を良
くするため、水洗工程２２で脱スケール面を水で十分に
濡らしておく。この水洗工程２２は必須ではない。続い
て、酸洗剤塗布工程２３で酸洗剤を脱スケール面全面に
塗布し、所定時間保持しておく。その後水洗工程２４で
水にて酸洗剤を除去し、自然乾燥工程２５で乾燥する。FIG. 1 shows a process diagram of the method of the present invention. First, pretreatment step 2
Step 1: Completely remove scale by shot blasting. Next, in order to improve the wettability between the descaled surface and the acid detergent, the descaled surface is sufficiently wetted with water in a washing step 22. This water washing step 22 is not essential. Subsequently, in an acid detergent application step 23, an acid detergent is applied to the entire surface of the descaled surface and maintained for a predetermined period of time. Thereafter, the acid detergent is removed with water in a washing step 24, and the product is dried in a natural drying step 25.
使用する酸洗剤の条件は、下記のとおりである。The conditions of the acid detergent used are as follows.
ＨＦ：３．５〜５．０％
ＨＮＯ３，１２〜１５％
粘性係数： ０．１０〜０．１５μｋｇｓ／ｍ適用温度
・５〜３５°Ｃ
粘性係数を０．１０〜０，１５μｋｇｓ／ｎ？にした理
由を第６Ｉ２Ｉを参照して説明する。粘性係数が０．１
０μｋｇｓ／ｍ以上あれば、耐食性能は確保できる。ま
た、粘性係数が０，２０μｋｇｓ／ｍになると本発明法
において作業性が著しく低下する。よって、粘性係数は
０．１０〜０．１５μｋｇｓ／ｍ２の範囲が望ましい。HF: 3.5-5.0% HNO3, 12-15% Viscosity coefficient: 0.10-0.15μkgs/m Applicable temperature: 5-35°C Viscosity coefficient 0.10-0.15μkgs/n? The reason for this will be explained with reference to No. 6I2I. Viscosity coefficient is 0.1
If it is 0 μkgs/m or more, corrosion resistance performance can be ensured. Further, when the viscosity coefficient is 0.20 μkgs/m, the workability in the method of the present invention is significantly reduced. Therefore, the viscosity coefficient is preferably in the range of 0.10 to 0.15 μkgs/m 2 .
適用温度を５〜３５℃にした理由を第７図を参照して説
明する。適用温度５〜３５℃の範囲が耐食性能の良好な
成績となっている。適用温度が低すぎると酸洗剤の反応
速度が著しく遅くなり、また、適用温度が高くなってい
くと、反応速度は速くなる。しかし、あまり高すぎると
、酸洗剤の反応時間より酸洗剤の乾燥時間が速いため、
十分な脱スケールができない。The reason why the applied temperature was set at 5 to 35°C will be explained with reference to FIG. Good corrosion resistance performance was obtained when the applied temperature was in the range of 5 to 35°C. If the application temperature is too low, the reaction rate of the acid detergent will be significantly slow, and as the application temperature becomes higher, the reaction rate will become faster. However, if the temperature is too high, the drying time of the acid detergent will be faster than the reaction time of the acid detergent.
Sufficient descaling is not possible.
第３図は、本発明法を実施する装置の一例を示す。クラ
ッド鋼管１を受台２の上に配置し、クラッド鋼管１の一
端をキャップ３で蓋をする。FIG. 3 shows an example of an apparatus for carrying out the method of the invention. A clad steel pipe 1 is placed on a pedestal 2, and one end of the clad steel pipe 1 is covered with a cap 3.
支持バイブ４に酸洗剤スプレ・ノズル５および水スプレ
ノズル６を取り付け、クラッド鋼管１内を走行できる
ようにキャスタ付き脚４１を取り付ける。ノズル５と６
との間に仕切板７を設け、支持バイブ４と一体に移動で
きるようにする。An acid detergent spray nozzle 5 and a water spray nozzle 6 are attached to the support vibrator 4, and legs 41 with casters are attached so that it can run inside the clad steel pipe 1. Nozzles 5 and 6
A partition plate 7 is provided between the support vibrator 4 and the support vibrator 4 so that the support vibrator 4 can move together with the support vibrator 4.
ホース５１およびポンプ５２をかいしてノズル５に酸洗
剤を供給する。同様に、ホース６１およびポンプ６２を
かいしてノズル６に水を供給する。Acid detergent is supplied to the nozzle 5 through a hose 51 and a pump 52. Similarly, water is supplied to the nozzle 6 using a hose 61 and a pump 62.
クラッド鋼管１内に滞留する酸洗剤はタンク８に適当に
回収される。The acid detergent remaining in the clad steel pipe 1 is appropriately collected in the tank 8.
（ト） 効果
本発明によれば、ポンプ、ホース、スプレ ノズル等よ
りなる装置で、ある程度粘性を持った酸洗剤を脱スケー
ル面に塗布することにより、従来採算性が低いという問
題点を解消した。下記の第１表に従来法（第２図（Ａ）
、（Ｂ））と本発明法との比較を示す。安全面を除くと
本発明法はいずれをとっても従来法と比して優れている
。(g) Effects According to the present invention, by applying an acid detergent with a certain degree of viscosity to the descaling surface using a device consisting of a pump, a hose, a spray nozzle, etc., the conventional problem of low profitability has been solved. . Table 1 below shows the conventional method (Figure 2 (A)
, (B)) and the method of the present invention. Except for safety, the method of the present invention is superior to conventional methods in all respects.
従来法（第２図（Ａ））と本発明法とを比較するとコス
Ｉ・面においては約１７４の費用ですみ、能率面におい
ては、約１７５の時間ですむ。また、耐食性能を第５図
に示す、酸洗剤塗布後水洗までの時間は２０分以上あれ
ば十分な耐食性能が得られることがわかる。Comparing the conventional method (FIG. 2(A)) and the method of the present invention, the cost is about 174 in terms of cost I and the time is about 175 in terms of efficiency. Further, the corrosion resistance performance is shown in FIG. 5, and it can be seen that sufficient corrosion resistance performance can be obtained if the time from application of the acid detergent to washing with water is 20 minutes or more.
本発明は、上記問題を全面的に解消し、採算性が高く、
耐食性能も十分に確保できる。The present invention completely solves the above problems, is highly profitable, and
Sufficient corrosion resistance performance can also be ensured.
本発明は本来大径ＵＯＥを対象としているが、コスト能
率面において優れており、小径管（ＥＲＷ）にも適用で
きる。Although the present invention is originally intended for large-diameter UOE, it is excellent in terms of cost efficiency and can also be applied to small-diameter pipes (ERW).
第１図は本発明の方法の工程説明図。第２図は従来の方
法の説明図。第３図は本発明の方法を実施する装置の説
明図。第４図はクラッド鋼管の一部の縦断面図。第５図
は耐食性能を示すグラフ。
第６図は酸洗剤の粘性係数の！＆適値を示すグラフ。
第７図は酸洗剤の適用温度の最適値を示すグラフ。
１：クラッド鋼管 ２二叉台
３：キャップ ４．支持パイプ
５：酸洗剤スプレ・ノズル
６：水スプレ・ノズル
７：仕切板 ８・タンク
（外４名）
第５図
６ ０Ｍ ａｈａ ａ１５ Ｉ２Ｉ
Ｊ２ｊ６Ｊｌ）も）を碑Ｊ欠弘にｔヅーリ
０ ＩＩ ２０ ３０ ＃ ５１）
Ｊθ７Ｊｉ潰り−丁目うｕ（’ＣンFIG. 1 is a process explanatory diagram of the method of the present invention. FIG. 2 is an explanatory diagram of the conventional method. FIG. 3 is an explanatory diagram of an apparatus for carrying out the method of the present invention. FIG. 4 is a longitudinal cross-sectional view of a portion of a clad steel pipe. Figure 5 is a graph showing corrosion resistance performance. Figure 6 shows the viscosity coefficient of acid detergent! & A graph showing the appropriate value. FIG. 7 is a graph showing the optimum temperature for applying acid detergent. 1: Clad steel pipe 2 Fork 3: Cap 4. Support pipe 5: Acid detergent spray nozzle 6: Water spray nozzle 7: Partition plate 8/Tank (4 people outside) Fig. 5 6 0M aha a15 I2I
J2j6Jl) also monument J Kakuhiro tzuri 0 II 20 30 # 51)
Jθ7Ji crush-chomeuu('Cn
Claims (1)
をＨＦ、ＨＮＯ＿３による酸洗剤を用いて脱スケールす
る方法において、前記内面にショットブラストによる前
処理を施すこと、該内面に下記の条件下にある酸洗剤を
塗布すること、該内面を水洗すること、該鋼管を自然乾
燥することからなるクラッド鋼管内面の脱スケール方法
。 粘性係数：０．１０〜０．１５μｋｇｓ／ｍ＾２適用温
度：５〜３５℃[Claims] A method for descaling the inner surface of a clad steel pipe having a high Ni-Fe alloy laminated on the inner surface using an acid detergent of HF and HNO_3, comprising: pre-treating the inner surface by shot blasting; A method for descaling the inner surface of a clad steel pipe, which comprises applying an acid detergent under the following conditions to the inner surface of the pipe, washing the inner surface with water, and naturally drying the steel pipe. Viscosity coefficient: 0.10~0.15μkgs/m^2 Applicable temperature: 5~35℃
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7728088A JPH01247583A (en) | 1988-03-30 | 1988-03-30 | Method for descaling internal surface of clad steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7728088A JPH01247583A (en) | 1988-03-30 | 1988-03-30 | Method for descaling internal surface of clad steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01247583A true JPH01247583A (en) | 1989-10-03 |
Family
ID=13629454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7728088A Pending JPH01247583A (en) | 1988-03-30 | 1988-03-30 | Method for descaling internal surface of clad steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01247583A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020041236A (en) * | 2000-11-27 | 2002-06-01 | 이구택 | A method for flushing tin plating line |
| US7066188B2 (en) * | 2002-05-14 | 2006-06-27 | Mac & Mac Hydrodemolition Inc. | Interior sewer pipeline scarifying apparatus |
| US7128074B2 (en) * | 1998-07-30 | 2006-10-31 | Mac & Mac Hydrodemolition, Inc. | Scarifier for the interior surface of a pipeline |
| CN103361664A (en) * | 2013-07-31 | 2013-10-23 | 中国化学工程第三建设有限公司 | Cleaning method of carbon steel pipeline and cleaning agents |
| CN108085706A (en) * | 2016-11-19 | 2018-05-29 | 天津欧津汇溢市场调查有限公司 | A kind of Building technology service rust removing device for steel tube |
-
1988
- 1988-03-30 JP JP7728088A patent/JPH01247583A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7128074B2 (en) * | 1998-07-30 | 2006-10-31 | Mac & Mac Hydrodemolition, Inc. | Scarifier for the interior surface of a pipeline |
| KR20020041236A (en) * | 2000-11-27 | 2002-06-01 | 이구택 | A method for flushing tin plating line |
| US7066188B2 (en) * | 2002-05-14 | 2006-06-27 | Mac & Mac Hydrodemolition Inc. | Interior sewer pipeline scarifying apparatus |
| CN103361664A (en) * | 2013-07-31 | 2013-10-23 | 中国化学工程第三建设有限公司 | Cleaning method of carbon steel pipeline and cleaning agents |
| CN103361664B (en) * | 2013-07-31 | 2016-06-22 | 中国化学工程第三建设有限公司 | Carbon steel piping cleaning method |
| CN108085706A (en) * | 2016-11-19 | 2018-05-29 | 天津欧津汇溢市场调查有限公司 | A kind of Building technology service rust removing device for steel tube |
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