JPH01166896A - Manufacture of stripe taking type resistance welded steel tube excellent in low temperature toughness - Google Patents
Manufacture of stripe taking type resistance welded steel tube excellent in low temperature toughnessInfo
- Publication number
- JPH01166896A JPH01166896A JP32427587A JP32427587A JPH01166896A JP H01166896 A JPH01166896 A JP H01166896A JP 32427587 A JP32427587 A JP 32427587A JP 32427587 A JP32427587 A JP 32427587A JP H01166896 A JPH01166896 A JP H01166896A
- Authority
- JP
- Japan
- Prior art keywords
- resistance welded
- edges
- welded steel
- steel tube
- toughness
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 38
- 239000010959 steel Substances 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000005204 segregation Methods 0.000 abstract description 8
- 238000010008 shearing Methods 0.000 abstract description 5
- 239000011159 matrix material Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000010953 base metal Substances 0.000 abstract 1
- 238000007665 sagging Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は低温靭性に優れた条取型電縫鋼管の製造方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a striated electric resistance welded steel pipe having excellent low-temperature toughness.
石油危機以来、北海、カナダ、アラスカ等のような極寒
地での原油の採油及びパイプラインの施設が活発に行わ
れるようになった。Since the oil crisis, crude oil extraction and pipeline facilities have been actively constructed in frigid regions such as the North Sea, Canada, and Alaska.
そこで、低温靭性に優れた電縫鋼管を要求する需要家が
多くなっている。電縫鋼管の場合、パイプサイズ（外径
）が一定板下になると、圧延コイルを剪断によって、多
条に長手方向に分割した鋼帯を使用するが、この剪断を
行うと、第１図に示す如く、剪断された鋼帯１のエツジ
部２にダレ３が生じ、圧延コイルの肉厚中央部の偏析部
４も、剪断応力方向にダレ３ることになる。これを、こ
のまま成形、溶接するのが一般的であり、この場合、第
２図に示す如く、肉厚中央部の偏析部４が電縫溶接部５
に平行に圧着されることＫなり、客先要求の溶接部低温
靭性を充分満足できない問題があった。Therefore, an increasing number of customers are demanding electric resistance welded steel pipes with excellent low-temperature toughness. In the case of electric resistance welded steel pipes, when the pipe size (outside diameter) falls below a certain level, a rolled coil is sheared into a steel strip divided into multiple strips in the longitudinal direction. As shown, sag 3 occurs at the edge portion 2 of the sheared steel strip 1, and the segregated portion 4 at the center of the wall thickness of the rolled coil also sag 3 in the direction of the shear stress. This is generally formed and welded as is, and in this case, as shown in FIG.
There was a problem in that the low temperature toughness of the welded part required by the customer could not be fully satisfied because the weld was crimped parallel to the .
本発明は、この条取型電縫鋼管の偏析部のダレによる問
題を解決しようとするもので、ホットコイル肉厚中央部
の偏析部が、電縫溶接部に平行に近く、圧着されるのを
、回避する事により安定した溶接部靭性を得ようとする
ものである。The present invention aims to solve the problem caused by the sagging of the segregated part of the striped electric resistance welded steel pipe.The present invention aims to solve the problem caused by the sagging of the segregated part of the striped electric resistance welded steel pipe. The aim is to obtain stable weld toughness by avoiding this.
本発明の要旨は、長手方向に条取りした鋼帯を用いて電
縫鋼管を製造するに際し、条鷹りした鋼帯のエツジをエ
ツジミラーでスカーフィングすることを特徴とする低温
靭性に優れた条取型電縫鋼管の製造方法である。The gist of the present invention is to provide a strip with excellent low-temperature toughness characterized by scarfing the edges of the striped steel strip with an edge mirror when manufacturing an electric resistance welded steel pipe using a longitudinally striped steel strip. This is a method for manufacturing a molded ERW steel pipe.
即ち、本発明は条取型の母材を用いて、電縫鋼管を製造
する際、剪断方式により、長手方向に分割された鋼帯に
対して、エツジミラーによるスカーフインクを施すこと
で、エツジのダレを除去し、溶接部靭性を安定的に得よ
うとするものである。That is, when manufacturing an ERW steel pipe using a striped base material, the present invention applies scarf ink using an edge mirror to a steel strip that is divided in the longitudinal direction by a shearing method. The purpose is to remove sagging and stably obtain weld toughness.
次に偏析について述べると、化学成分がＣ。Next, talking about segregation, the chemical component is C.
Ｍｎ、 Ｐ、 Ｓ等を含有する鋼の連続鋳造鋳片は
第３図に示す如く、鋳片６の肉厚中央部の位置にＣ，Ｍ
ｎ、 Ｐ、 Ｓ等の偏析部４が生じる。この成分の偏
析によって、鋳片から圧延されたホットコイルの肉厚中
央部には、マトリックス九対して硬度が高いパーライト
、ベーナイトや島条マルテンサイト組織が生じると共に
、ＭＪ′ＩＳが存在することとなる。このようなホット
コイルを剪断方式によって、長手方向に多条分割すると
、−第１図に示す如く、エツジ２のダレ３が生じ、これ
をこのまま電縫溶接すると、第２図の如く、マトリック
スに対して硬度の高い組織部や、ＭｎＳが電縫溶接部５
に、はぼ平行に圧潰され、それらが脆性破壊発生起点や
破壊伝播経路となり、靭性が劣化する。As shown in Fig. 3, a continuously cast slab of steel containing Mn, P, S, etc. has C, M at the center of the wall thickness of the slab 6.
Segregation parts 4 such as n, P, and S are generated. Due to the segregation of these components, pearlite, bainite, and island martensite structures, which have higher hardness than the matrix, are formed in the thick center of the hot coil rolled from the slab, and MJ'IS is also present. Become. When such a hot coil is divided into multiple strips in the longitudinal direction by shearing, a sag 3 at the edge 2 occurs as shown in Figure 1. If this is welded by electric resistance welding as it is, it will form a matrix as shown in Figure 2. On the other hand, tissue parts with high hardness and MnS are ERW welded parts 5
, they are crushed almost parallel to each other, and they become brittle fracture initiation points and fracture propagation paths, deteriorating toughness.
本発明は剪断によって生じたダレをエツジミラーにより
取り除くものである。この事により、コイルの肉厚中央
部の偏析に起因するマトリックスに対して硬度の高い組
織や、Ｍｎｇの電縫溶接部への圧看は最小限に抑えられ
、溶接部靭性が改善される。The present invention uses an edge mirror to remove sagging caused by shearing. As a result, the microstructure with high hardness against the matrix due to segregation in the central part of the wall thickness of the coil, and the stress on the electric resistance welded part of Mng are suppressed to a minimum, and the toughness of the welded part is improved.
尚、エツジミラーによりエツジをスカーフィングするの
は、約１晴〜５鵡程度のスカーフインクを行えば、ダレ
が除去でき、充分なものである。Incidentally, when scarfing the edges with an edge mirror, it is sufficient to remove sag by scarfing about 1 to 5 times.
次にエツジミラー設備について、第４図を用いて述べる
と、複数の刃７を具備するエツジミラー８を鋼帯１０両
側に設け、該エツジミラーを回転させて鋼帯１０両側を
スカーフィングし、条取りした時に発生するダレを除去
するものである。Next, the edge mirror equipment will be described using FIG. 4. Edge mirrors 8 equipped with a plurality of blades 7 are provided on both sides of the steel strip 10, and the edge mirrors are rotated to scarf and strip both sides of the steel strip 10. This removes the sag that sometimes occurs.
次に本発明の実施例について述べる。Next, embodiments of the present invention will be described.
電縫鋼管の母材となるホットコイルのサイズが、厚み９
． Ｏｍ ＋ 巾１１２３調のものを長手方向に巾５５
０■に条取りを行った。その条取りした鋼帯をエツジミ
ラーによりエツジを２１１ｗ１＋程度、スカーフインク
を行い、エツジ部のダレを除去した。The size of the hot coil, which is the base material of the ERW steel pipe, is 9 mm thick.
．． Om + width 1123 width in the longitudinal direction
Stripping was performed at 0■. The edges of the striped steel strip were scarfed to about 211w1+ using an edge mirror to remove sagging at the edges.
ダレを除去した鋼帯で、第１表に示す電縫鋼管を製造し
、電縫溶接部の試験片を採取して低温靭性の試験を行い
、ダレを除去しない比較例と共にその結果を第２図に示
す。ERW steel pipes shown in Table 1 were manufactured using the steel strip from which sagging was removed, and test pieces of the ERW welded parts were taken and tested for low-temperature toughness. As shown in the figure.
尚、試験方法は通常の２ ｍ Ｖ ）ッテシャルピーを
用いて、試験を行った。Incidentally, the test was conducted using a normal 2 mV) Charpy.
第１表に示す如く、本発明によれば、電縫鋼管の溶接部
が低温靭性に優れていることが明らかである。As shown in Table 1, it is clear that according to the present invention, the welded portion of the electric resistance welded steel pipe has excellent low-temperature toughness.
本発明によれば、溶接部靭性を著しく向上させる条取型
電縫鋼管の製造が可能となり、その効果は極めて大きい
ものである。According to the present invention, it is possible to manufacture a striated electric resistance welded steel pipe that significantly improves the toughness of the weld zone, and the effect is extremely large.
第１図は本発明の鋼帯のダレを除去するエツジミラーの
装置例を示す説明図、第２図は本発明実施例及び比較例
の結果を示す図、第３図は条取りした時Ｋ、鋼帯のエツ
ジに発生するダレを示す説明図、第４図（ａ）、 （ｂ
）は条取りした鋼帯で電縫鋼管を製造した時、溶接部の
偏析の状態を示す説明図、第５図は連続鋳造鋳片のＣ断
面における偏析の状態を示す説明図である。
１・・・鋼帯 ２・・・エツジ部３・・・ダ
レ ４・・・偏析部５・・・電縫溶接部
６・・・鋳片７・・・刃 ８・・・エ
ツジミラ−０第１図
１：鋼帯
７：刃
８：エッジミラー
第３図
第５図
手続補正書
昭和２３年ｌ １３０日
特許庁長官小川邦夫 殿 ５Ｌ。
事件との関係 出 願 人
４、代理 人
補 正 書
本願明細書中下記事項を補正いたします。
記
１、第２頁４行目Ｋ
「第１図」とあるを
「第３図」と訂正する。
２第２頁８行目に
「第２図」とあるを
「第４図」と訂正する。
３、第３頁１２〜１３行目Ｋ
「第３図」とあるを
「第５図」と訂正する。
４、第４頁１行目に
「第１図」とあるな
「第３図」と訂正する。
５６第４頁２行目に
「第２図」とあるを
「第４図」と訂正する。
６、第４頁下から４行目に
「第４図」とあるを
「第１図」と訂正する１、
７、第５頁１０〜１１行目に
「第１表に示す電縫鋼管を製造し、」とあるを「第１表
に示す成分の素材を用いて電縫鋼管を製造し、」と訂正
する。
８、第７頁１行目に
「第１表」とあるを
「第２図」と訂正する。
Ｍ７．ｑ＋
代理人 谷 山 輝 雄、 、ｉ、ｊＪｉｉ゛：−ニ
ニーシFIG. 1 is an explanatory diagram showing an example of an edge mirror device for removing sag from a steel strip according to the present invention, FIG. 2 is a diagram showing the results of an example of the present invention and a comparative example, and FIG. 3 is a diagram showing K when stripping, Explanatory drawings showing the sagging that occurs at the edges of the steel strip, Figures 4 (a) and (b)
) is an explanatory diagram showing the state of segregation in a welded part when an electric resistance welded steel pipe is manufactured from a striped steel strip, and FIG. 5 is an explanatory diagram showing the state of segregation in the C section of a continuously cast slab. 1... Steel strip 2... Edge portion 3... Sagging 4... Segregation portion 5... Electric resistance welding part
6... Slab 7... Blade 8... Edge mirror 0 Figure 1 1: Steel strip 7: Blade 8: Edge mirror Figure 3 Figure 5 Procedural amendment 1945 l 130th Commissioner of the Patent Office Kunio Ogawa 5L. Relationship to the Case: Applicant 4, Agent's Amendment The following matters in the specification of the application are amended. Note 1, page 2, line 4, K. Correct "Figure 1" to "Figure 3." 2 On page 2, line 8, "Figure 2" is corrected to "Figure 4." 3. Page 3, lines 12-13 K Correct "Figure 3" to "Figure 5." 4. In the first line of page 4, the text "Figure 1" should be corrected to "Figure 3." 56, page 4, line 2, the text "Figure 2" is corrected to "Figure 4." 6. On the 4th line from the bottom of page 4, "Fig. 4" is corrected to "Fig. 1." 1. 7. On the 5th page, lines 10-11, "ERW steel pipes shown in Table 1. The phrase "manufactured," should be corrected to "manufactured ERW steel pipes using materials with the ingredients shown in Table 1." 8. In the first line of page 7, the text "Table 1" is corrected to "Figure 2." M7. q+ Agent Teruo Taniyama, ,i,jJii゛:-Ninishi
Claims (1)
に際し、条取りした鋼帯のエッジをエッジミラーでスカ
ーフィングすることを特徴とする低温靭性に優れた条取
型電縫鋼管の製造方法。When producing an ERW steel pipe using a longitudinally striated steel strip, the edge of the striated steel strip is scarfed with an edge mirror. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32427587A JPH01166896A (en) | 1987-12-22 | 1987-12-22 | Manufacture of stripe taking type resistance welded steel tube excellent in low temperature toughness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32427587A JPH01166896A (en) | 1987-12-22 | 1987-12-22 | Manufacture of stripe taking type resistance welded steel tube excellent in low temperature toughness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01166896A true JPH01166896A (en) | 1989-06-30 |
Family
ID=18163987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32427587A Pending JPH01166896A (en) | 1987-12-22 | 1987-12-22 | Manufacture of stripe taking type resistance welded steel tube excellent in low temperature toughness |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01166896A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0475604U (en) * | 1990-11-13 | 1992-07-02 | ||
| JPH0557340A (en) * | 1991-01-30 | 1993-03-09 | Nkk Corp | Manufacture of ultrahigh strength electric resistance welded steel tube |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5939248A (en) * | 1982-08-25 | 1984-03-03 | Kowa Kogyo:Kk | Preparation of rolled cake |
| JPS613841A (en) * | 1984-06-18 | 1986-01-09 | Nippon Steel Corp | Manufacture of projected bead removing type electric welded steel pipe with superior toughness at low temperature |
-
1987
- 1987-12-22 JP JP32427587A patent/JPH01166896A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5939248A (en) * | 1982-08-25 | 1984-03-03 | Kowa Kogyo:Kk | Preparation of rolled cake |
| JPS613841A (en) * | 1984-06-18 | 1986-01-09 | Nippon Steel Corp | Manufacture of projected bead removing type electric welded steel pipe with superior toughness at low temperature |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0475604U (en) * | 1990-11-13 | 1992-07-02 | ||
| JPH0557340A (en) * | 1991-01-30 | 1993-03-09 | Nkk Corp | Manufacture of ultrahigh strength electric resistance welded steel tube |
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