JPS63278688A - Production of austenitic stainless steel welded pipe - Google Patents
Production of austenitic stainless steel welded pipeInfo
- Publication number
- JPS63278688A JPS63278688A JP62111181A JP11118187A JPS63278688A JP S63278688 A JPS63278688 A JP S63278688A JP 62111181 A JP62111181 A JP 62111181A JP 11118187 A JP11118187 A JP 11118187A JP S63278688 A JPS63278688 A JP S63278688A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- stainless steel
- austenitic stainless
- equation
- speed
- 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
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 238000003466 welding Methods 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 150000001247 metal acetylides Chemical class 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 241000272534 Struthio camelus Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
Landscapes
- Laser Beam Processing (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は配管、熱交換器、化学プラントなどに使用する
オーステナイト系ステンレス鋼溶接管の製造に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the manufacture of welded austenitic stainless steel pipes for use in piping, heat exchangers, chemical plants, etc.
（従来の技術）
上記用途に使用されるオーステナイト系ステンレス鋼溶
接管は、管鋼を管状に成形し、突合せ部ｔ−ＴＩＧ溶接
にて造管溶接を行い、その後１０００℃以上の温度で溶
体化処理を行って、製造していた。(Prior art) Welded austenitic stainless steel pipes used for the above applications are made by forming pipe steel into a tubular shape, welding the butt portions by T-TIG welding, and then solution-melting at a temperature of 1000°C or higher. processed and manufactured.
（発明が解決しようとする問題点）
ＴＩＧ溶接による造管溶接の場合溶接熱影響部の冷却速
度が遅いため、オーステナイト系ステンレス鋼において
は、熱影響部の粒界に炭化物が析出し、粒界腐食の原因
になる。したがりて上述のように溶接後浴体化処理が必
須となる。溶体化熱処理は高温でろシ、そのエネルギー
コストばかシでなく、酸化を防止するための設ｇＭ耐設
置づ゛るか、あるいは酸化したものを酸洗する必要が生
じるので製造コストのかなシの部分を占める。(Problems to be Solved by the Invention) In the case of pipe making welding by TIG welding, the cooling rate of the weld heat affected zone is slow, so in austenitic stainless steel, carbides precipitate at the grain boundaries of the heat affected zone, and the grain boundaries It may cause corrosion. Therefore, as mentioned above, post-welding bath treatment is essential. Solution heat treatment requires high-temperature filtering, which is not only expensive in terms of energy costs, but also requires installation to prevent oxidation or pickling of oxidized products, which increases production costs. occupies
本発明はかかるコストのかかる造管浴接後の溶体化処理
を簡略化することを目的とする。The object of the present invention is to simplify the costly solution treatment after welding to the tube manufacturing bath.
（問題点を解決するための手段及び作用）本発明は、レ
ーザーを用いたオーステナイト系ステンレス鋼造管溶接
にあたり、（１）式で計算される速度以上の溶接速度で
溶接した後、温度３００〜６００℃で時間２分以内保持
し、その後空冷の熱処理を行うことを特徴とするオース
テナイト系ステンレス鋼溶接管の製造方法である。(Means and effects for solving the problems) The present invention involves welding austenitic stainless steel pipes using a laser, and after welding at a welding speed higher than the speed calculated by equation (1), welding at a temperature of 300 to This is a method for producing an austenitic stainless steel welded pipe, which is characterized by holding the pipe at 600° C. for 2 minutes or less, and then performing a heat treatment of air cooling.
Ｖ＝６０Ｐ／３００ｔ −（１）但し Ｖ：溶接
速度（信／ｍ１ｎ）
Ｐ：レーザー出力（ｗａｔｔ ）
ｔ：材料肉厚（−）
である。V = 60P/300t - (1) where V: welding speed (in/m1n) P: laser output (watt) t: material thickness (-).
本発明の構成要件の限定理由はつぎのとおりである。The reasons for limiting the constituent elements of the present invention are as follows.
エネルギー密度の高いレーザー溶接を用いれば、溶接熱
影響部の冷却速度は速くなることは公知である。しかし
オーステナイト系ステンレス鋼においては、レーデ−溶
接した場合でも、溶接熱影響部に炭化物が析出して粒界
腐食が生じることがあり、溶接熱影響部に炭化物を析出
させないための条件は知られていない０本発明者は研究
の結果、単位肉厚当りの入熱量が３００ＫＪ以下であれ
ば、溶接熱影響部に炭化物が析出しないことを見いだし
た。それを、溶接条件に換算する。単位肉厚当りの入熱
Ｑは
Ｑ＝６０Ｐ／Ｖｔ（ＫＪ／ｍ） −（２）であり、（
２）式にＱ＝３００ＫＪを代入し、溶接速度Ｖを求める
と次の（１）式を得る。It is known that if laser welding with high energy density is used, the cooling rate of the weld heat affected zone becomes faster. However, in austenitic stainless steel, even when radar welding is performed, carbides may precipitate in the weld heat-affected zone and intergranular corrosion may occur, and the conditions for preventing carbide precipitation in the weld heat-affected zone are not known. As a result of research, the present inventor found that carbides do not precipitate in the weld heat affected zone if the heat input per unit wall thickness is 300 KJ or less. Convert it into welding conditions. The heat input Q per unit wall thickness is Q = 60P/Vt (KJ/m) - (2), and (
By substituting Q=300KJ into equation 2) and finding the welding speed V, the following equation (1) is obtained.
Ｖ ＝ ６０ｐ／３００ｔ ・（ｔ）すなわち
、溶接熱影響部に炭化物を析出させない条件として、溶
接速度を（１）式で計算される速度以上とした。V = 60p/300t (t) That is, as a condition for preventing carbide from precipitating in the weld heat affected zone, the welding speed was set to be equal to or higher than the speed calculated by equation (1).
次に、造管溶接後の熱処理条件を限定した理由であるが
、かかる極小入熱では冷却速度が非常に速いため、溶着
金属に歪が集中し、溶着金属の延性が劣化する。この劣
化を回復させるために、溶接後の熱処理を３００〜６０
０℃で２分以内保持しその後空冷の条件とした。Next, the reason for limiting the heat treatment conditions after pipe making and welding is that with such a minimal heat input, the cooling rate is extremely fast, so strain concentrates on the weld metal and the ductility of the weld metal deteriorates. In order to recover from this deterioration, heat treatment after welding is performed at 300~600°C.
The temperature was kept at 0° C. for less than 2 minutes and then air-cooled.
３００℃未満では歪除去が不十分であるため、冷間加工
した際に溶接部に割れが生じ、６００℃を越え、あるい
は６００℃、２分を越えると炭化物が析出して粒界腐食
を生じる恐れがある。If the temperature is below 300℃, strain removal is insufficient, so cracks will occur in the weld during cold working, and if the temperature exceeds 600℃ or exceeds 2 minutes at 600℃, carbides will precipitate and intergranular corrosion will occur. There is a fear.
（実施例）
表１に示すように番号に「町を付したものが本発明によ
るものであシ、その他は比較例である。本発明による製
造法によれば、高温の溶体化を施さなくともストラウス
試験結果が示すように耐食性が良好でかつ曲げ試験結果
で示すように溶着金属の延性が優れたオーステナイト系
ステンレス鋼管が得られる。(Example) As shown in Table 1, those with "machi" attached to the numbers are those according to the present invention, and the others are comparative examples. According to the manufacturing method according to the present invention, high temperature solution treatment is not required. In both cases, an austenitic stainless steel pipe with good corrosion resistance as shown by the Strauss test results and excellent ductility of the weld metal as shown by the bending test results can be obtained.
（発明の効果）
本発明は今後ますます需要の増加が予想されるオーステ
ナイト系ステンレス鋼管を有効に且つ安価に製造できる
方法を提供するものであり、工業的価値は絶大である。(Effects of the Invention) The present invention provides a method for effectively and inexpensively manufacturing austenitic stainless steel pipes, the demand of which is expected to increase further in the future, and has tremendous industrial value.
０ −ン〜0 -n~
Claims (1)
接にあたり、（１）式で計算される速度以上の溶接速度
で溶接した後、温度３００〜６００℃で時間２分以内保
持し、その後空冷の熱処理を行うことを特徴とするオー
ステナイト系ステンレス鋼溶接管の製造方法 Ｖ＝６０Ｐ／３００ｔ・・・（１） 但しＶ：溶接速度（ｃｍ／ｍｉｎ） ｐ：レーザー出力（ｗａｔｔ） ｔ：材料肉厚（ｍｍ）。[Scope of Claims] When welding austenitic stainless steel pipes using a laser, after welding at a welding speed higher than the speed calculated by formula (1), the welding is held at a temperature of 300 to 600°C for less than 2 minutes, A manufacturing method for austenitic stainless steel welded pipes characterized by performing air-cooling heat treatment thereafter V = 60P/300t... (1) where V: welding speed (cm/min) p: laser output (watts) t: Material wall thickness (mm).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62111181A JPS63278688A (en) | 1987-05-07 | 1987-05-07 | Production of austenitic stainless steel welded pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62111181A JPS63278688A (en) | 1987-05-07 | 1987-05-07 | Production of austenitic stainless steel welded pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63278688A true JPS63278688A (en) | 1988-11-16 |
| JPH0356151B2 JPH0356151B2 (en) | 1991-08-27 |
Family
ID=14554546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62111181A Granted JPS63278688A (en) | 1987-05-07 | 1987-05-07 | Production of austenitic stainless steel welded pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63278688A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6220306B1 (en) | 1998-11-30 | 2001-04-24 | Sumitomo Metal Ind | Low carbon martensite stainless steel plate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59101293A (en) * | 1982-11-30 | 1984-06-11 | Sumitomo Metal Ind Ltd | Production of welded pipe |
-
1987
- 1987-05-07 JP JP62111181A patent/JPS63278688A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59101293A (en) * | 1982-11-30 | 1984-06-11 | Sumitomo Metal Ind Ltd | Production of welded pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6220306B1 (en) | 1998-11-30 | 2001-04-24 | Sumitomo Metal Ind | Low carbon martensite stainless steel plate |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0356151B2 (en) | 1991-08-27 |
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