JPH02217423A - Heat treatment for seam weld zone in resistance welded tube - Google Patents
Heat treatment for seam weld zone in resistance welded tubeInfo
- Publication number
- JPH02217423A JPH02217423A JP3977589A JP3977589A JPH02217423A JP H02217423 A JPH02217423 A JP H02217423A JP 3977589 A JP3977589 A JP 3977589A JP 3977589 A JP3977589 A JP 3977589A JP H02217423 A JPH02217423 A JP H02217423A
- Authority
- JP
- Japan
- Prior art keywords
- seam weld
- weld zone
- resistance welded
- welded tube
- heat treatment
- 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
- 238000010438 heat treatment Methods 0.000 title claims abstract description 5
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 abstract description 11
- 230000035882 stress Effects 0.000 abstract description 7
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract description 4
- 230000008646 thermal stress Effects 0.000 abstract description 4
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 238000009941 weaving Methods 0.000 abstract 1
- 238000005452 bending Methods 0.000 description 6
- 238000005498 polishing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 239000010953 base metal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
Landscapes
- 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、例えば織機用ロール等に好適な電縫鋼管を得
るための継目溶接部の熱処理方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION "Industrial Field of Application" The present invention relates to a method of heat treating a seam weld to obtain an electric resistance welded steel pipe suitable for, for example, a roll for a loom.
「従来の技術」
従来、例えばｎ＆機用ロール等に好適な鋼管としては、
継Ｌ１無鋼管が使用されてきた。"Conventional technology" Conventionally, steel pipes suitable for, for example, rolls for n&machines, etc.
Joint L1 steel pipes have been used.
その理由としては、継目がなく、製品品質の信頼性が高
いこと、熱間加工であるため、全長にわたって、組織、
硬度、残留応力がほぼ均一であり、外周面の切削、研摩
等の加工性が良好であると共に、加工後の曲がり発生も
少ないことによる。The reasons for this are that there are no seams, the product quality is highly reliable, and because it is hot-processed, the structure and
This is because the hardness and residual stress are almost uniform, the outer peripheral surface has good machinability in cutting, polishing, etc., and there is little occurrence of bending after machining.
しかしながら、近年、電縫鋼管の製造技術の進歩と、製
品品質保証体制の充実およびコストダウン意識から、電
機用ロール等に電縫鋼管が使用されつつある。However, in recent years, due to advances in manufacturing technology for ERW steel pipes, enhancement of product quality assurance systems, and awareness of cost reduction, ERW steel pipes are being used for rolls for electrical machinery and the like.
［発明が解決しようとする課題」
さて、電縫鋼管の継目７８接部は、急熱、急冷のために
硬度が母材部に比較して著しく高く、外周面の切削時に
バイトが継目溶接部の個所において逃げたり、バイトが
欠ｔＮ したりして、切削、ｇｆ摩等の加工性に劣り、
しかも継目溶接部は、残留応力が大きいため、外周面を
切削すると、再び曲がりが発生する。[Problem to be Solved by the Invention] Now, the hardness of the joint 78 of an ERW steel pipe is significantly higher than that of the base material due to rapid heating and cooling, and the cutting tool may damage the joint weld when cutting the outer peripheral surface. The workability of cutting, gf machining, etc. is poor due to escape or missing bits at these points.
Moreover, since residual stress is large in the seam weld, if the outer circumferential surface is cut, bending will occur again.
そこで、本発明打は、継目溶接部の硬度および残留応力
を母材部とほぼ同し程度にするために、継目／Ｓ接部を
、その外面から内面まで焼鈍することを試みたが、継目
溶接部を、その外面から内面まで焼鈍すると、継目溶接
部がピーキングを呈し、直円度が悪くなり、外周面の切
削、研摩等の加工上に問題があった。Therefore, in order to make the hardness and residual stress of the seam weld almost the same as that of the base metal, the present invention attempted to anneal the seam/S contact from its outer surface to its inner surface. When a welded part is annealed from its outer surface to its inner surface, the seam welded part exhibits peaking, the roundness deteriorates, and there are problems in machining such as cutting and polishing the outer peripheral surface.
本発明は、かくの如き従来の問題点を解決すべくなした
電縫鋼管における継目溶接部の熱処理方法を開発したも
のである。The present invention has been developed to solve the above-mentioned conventional problems and to develop a method for heat treating seam welds in electric resistance welded steel pipes.
「ｇ！Ｉ題を解決するための手段」
本発明に係る１！縫鋼管における継目溶接部の熱処理方
法の要旨とするところは、電縫鋼管の継目溶接部を、そ
の外面から肉厚のＡ程度まで焼鈍することにある。"Means for solving g!I problem" 1! according to the present invention! The gist of the heat treatment method for a seam weld in an electric resistance welded steel pipe is to anneal the seam weld of an electric resistance welded steel pipe from its outer surface to a wall thickness of about A.
「作用」
前記の如く、電縫鋼管の継目溶接部を、その外面から肉
厚の２程度まで焼鈍することにより、継１１ ／８Ｂ部
の外面側硬度を母材部とほぼ同し程度にすることができ
るので、外周面の切削、研摩等の加工性を良好にするこ
とができると共に、継目溶接部近傍の熱応力を低（する
ことができるので、直円度を損うことがなく、シかも継
目溶接部の残留応力を低減することができるので、外周
面切削後の曲がりを抑制することができる。"Function" As mentioned above, by annealing the welded joint of the ERW steel pipe from its outer surface to about 2 times the wall thickness, the hardness of the outer surface of the joint 11/8B section is made to be approximately the same as that of the base material. This makes it possible to improve the machinability of the outer circumferential surface in cutting, polishing, etc., and also to reduce the thermal stress near the seam weld, without impairing the roundness. Since residual stress in the seam weld can be reduced, bending of the outer peripheral surface after cutting can be suppressed.
「実施例」
舊径１６５．２ ｍ、肉厚９．３ｆｌの電縫鋼管の継目
溶接部を、ンームアニーラーによりその外面から肉厚の
２程度まで焼鈍したところ、継目溶接部の外面（ｊｌＩ
硬度を母材部とほぼ同し程度にすることができるので、
り（周面の切削、研摩等の加工性を良好にすることがで
きると共に、継目溶接部近傍の熱応力を低くすることが
できるので、直円度を（ｎうことがなく、しかも継目溶
接部の残留応力を低減することができるので、外周面切
削後の曲がりを抑制することができた。``Example'' When a seam weld of an ERW steel pipe with a diameter of 165.2 m and a wall thickness of 9.3 fl was annealed from the outer surface to about 2 of the wall thickness using a beam annealer, the outer surface of the seam weld (jlI
Since the hardness can be made almost the same as the base material,
(It is possible to improve workability such as cutting and polishing the circumferential surface, and it is also possible to lower the thermal stress near the seam weld. Since the residual stress in the part can be reduced, bending of the outer circumferential surface after cutting can be suppressed.
下記第１表に、造管のままと、継目溶接部の肉厚のＡ焼
鈍（本発明方法）と、継目溶接部の肉厚の全焼鈍とにお
ける直円度および曲がりの比較を示す。Table 1 below shows a comparison of the roundness and bending of the as-made pipe, A annealing of the seam weld wall thickness (method of the present invention), and full annealing of the seam weld wall thickness.
第１表
上記第１表にて明らかな如く、本発明方法の継目溶接部
のη焼鈍が、例えば織機用ロール等に灯通な電縫鋼管を
得るために、総合的に優れていることがわかる。Table 1 As is clear from Table 1 above, the η annealing of seam welds by the method of the present invention is comprehensively superior for obtaining electrical resistance welded steel pipes that are suitable for use in, for example, rolls for looms. Recognize.
なお、第１表における直円度は、最大外径と最小外ｉ￥
との差によって評価した値である。In addition, the roundness in Table 1 is the maximum outer diameter and the minimum outer diameter i￥
This value is evaluated based on the difference between
「発明の効果」
本発明は、上述の如く、電縫鋼管の継目／８接部を、そ
の外面から肉厚の２程度まで焼鈍することにより、継目
／８接部の外面１１＋１硬度を母材部とほぼ同し程度に
することができるので、外周面の切削、（Ａ ＦＪ等の
加工性を良好にず・ることができると共に、継目溶接部
近傍の熱応力を低くすることができるので、直円度を損
うことがなり、シかも継目溶接部の残留応力を低減する
ことができるので、外周面切削１＆の曲がりを抑制する
ことができ、従って、例えば織機用ロール等に好適な電
縫鋼管を、コストアップなしに得ることができる。``Effects of the Invention'' As described above, the present invention has an effect of annealing the joints/8 joints of ERW steel pipes from the outer surface to about 2 times the wall thickness, so that the outer surface of the joints/8 joints has a hardness of 11+1 of the base material. Since it is possible to make the outer circumferential surface approximately the same as the area, it is possible to improve the machinability of the outer circumferential surface (A FJ, etc.), and it is also possible to reduce the thermal stress near the seam weld. This will reduce the residual stress in the seam weld, which may damage the roundness, and can suppress the bending of the outer circumferential surface cutting. Electric resistance welded steel pipes can be obtained without increasing costs.
Claims (1)
／２程度まで焼鈍することを特徴とする電縫鋼管におけ
る継目溶接部の熱処理方法。(1) The seam weld of the ERW steel pipe is
1. A method for heat treatment of a seam weld in an electric resistance welded steel pipe, characterized by annealing to about 1/2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3977589A JPH02217423A (en) | 1989-02-20 | 1989-02-20 | Heat treatment for seam weld zone in resistance welded tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3977589A JPH02217423A (en) | 1989-02-20 | 1989-02-20 | Heat treatment for seam weld zone in resistance welded tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02217423A true JPH02217423A (en) | 1990-08-30 |
Family
ID=12562308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3977589A Pending JPH02217423A (en) | 1989-02-20 | 1989-02-20 | Heat treatment for seam weld zone in resistance welded tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02217423A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005106050A1 (en) * | 2004-05-04 | 2005-11-10 | Norsk Hydro Asa | Method for improving the fatigue properties in a structure and structure made by such method |
-
1989
- 1989-02-20 JP JP3977589A patent/JPH02217423A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005106050A1 (en) * | 2004-05-04 | 2005-11-10 | Norsk Hydro Asa | Method for improving the fatigue properties in a structure and structure made by such method |
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