JPH08252629A - Production of forge welded steel tube of high strength, high quality of forge welded part - Google Patents
Production of forge welded steel tube of high strength, high quality of forge welded partInfo
- Publication number
- JPH08252629A JPH08252629A JP7058458A JP5845895A JPH08252629A JP H08252629 A JPH08252629 A JP H08252629A JP 7058458 A JP7058458 A JP 7058458A JP 5845895 A JP5845895 A JP 5845895A JP H08252629 A JPH08252629 A JP H08252629A
- Authority
- JP
- Japan
- Prior art keywords
- forged
- forge
- welding
- tubular
- skelp
- 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.)
- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000005242 forging Methods 0.000 claims description 27
- 238000007664 blowing Methods 0.000 abstract description 7
- 238000005098 hot rolling Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Landscapes
- Cleaning In General (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鍛接部高強度、高品質
の鍛接鋼管の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a high-strength forged welded steel pipe having a high strength at a forged portion.
【０００２】[0002]
【従来の技術】従来の鍛接鋼管の製造法を図３に示す。
鍛接鋼管は、材料となる鋼帯１を連続的に加熱炉２で１
２００℃〜１３００℃に加熱し成形ロール３，４で成形
し鍛接直前のウェルディングホーン５のノズル７からエ
ッジ部に酸素ブローをし鍛接する。その後、絞りロール
で順次絞り、圧延を加えて所定の外径、肉厚の鍛接鋼管
を連続的に造管する。この時、酸素ブロー方向は、管状
スケルプの進行方向と同方向であり、酸素ノズルからエ
ッジ部に酸素をブローする位置は鍛接直前であるため、
除去されなかったエッジ部付近のスケールおよび吹き飛
ばされ鍛接点付近に侵入したスケールが鍛接面に噛み込
み、夾雑物となって鍛接部の強度を低下させるという問
題点がある。鍛接部の強度、品質を向上させるため、特
開昭５３−９０１４８号のように管状スケルプのエッジ
部の鍛接面に管状スケルプの進行方向に対して逆方向に
酸素および空気を吹き付ける方法がある。2. Description of the Related Art A conventional method of manufacturing a forged steel pipe is shown in FIG.
The forged steel pipe is made by continuously heating the steel strip 1 used as the material in the heating furnace 2.
It is heated to 200 ° C. to 1300 ° C., molded by the molding rolls 3 and 4, and oxygen is blown from the nozzle 7 of the welding horn 5 just before forging to the edge portion for forge welding. After that, it is successively drawn by a drawing roll and rolled to continuously produce a forged steel pipe having a predetermined outer diameter and thickness. At this time, the oxygen blowing direction is the same as the traveling direction of the tubular skelp, and the position where oxygen is blown from the oxygen nozzle to the edge portion is immediately before forging welding,
There is a problem in that the scale near the edge portion that has not been removed and the scale that has been blown away and that has entered the vicinity of the forged contact bite into the forged surface and become foreign matter that reduces the strength of the forged portion. In order to improve the strength and quality of the forged portion, there is a method of blowing oxygen and air to the forged surface of the edge portion of the tubular skelp in the direction opposite to the traveling direction of the tubular skelp, as in JP-A-53-90148.
【０００３】[0003]
【発明が解決しようとする課題】図３に示すように従来
法の製造工程で、酸素ブローする位置は鍛接直前のウェ
ルディングホーン５のノズル７からで、しかも酸素ブロ
ー方向は管状スケルプ１の進行方向と同方向である。こ
のため、除去されなかった管状スケルプ１のエッジ部付
近のスケールおよび吹き飛ばされ鍛接付近に侵入したス
ケールが鍛接面に噛み込み夾雑物となって鍛接部の強度
を低下させるという問題点がある。また、従来法の鍛接
直前でのウェルディングホーンからの酸素ブローは、鍛
接面のスケールブローアウトとＦｅＯ生成熱により鍛接
面を瞬時に昇温するという二つの効果を同時に満たされ
なければならない。特開昭５３−９０１４８号のように
酸素ブローの方向を管状スケルプの進行方向に対して逆
方向にし鍛接面でのスケール噛み込みを防止する方法が
あるが、この場合、鍛接直前の酸素ブローでないため、
鍛接点付近では温度が下降し十分な鍛接温度が保持でき
ず鍛接不良になるという問題点がある。図中６は鍛接ロ
ールを示す。本発明は管状スケルプのエッジ部の鍛接面
のスケールを完全に除去し、十分な鍛接温度保持を可能
とし、前記の鍛接不良という問題点を解決することを目
的とする。As shown in FIG. 3, in the conventional manufacturing process, the position where oxygen is blown is from the nozzle 7 of the welding horn 5 immediately before forging, and the tubular skelp 1 advances in the direction of oxygen blow. It is the same direction as the direction. For this reason, there is a problem in that the scale near the edge of the tubular skelp 1 that has not been removed and the scale that has been blown away and that has entered the vicinity of the forge welding are caught in the forged surface and become foreign matter, which reduces the strength of the forged portion. In addition, the oxygen blowing from the welding horn just before the forging welding according to the conventional method must simultaneously satisfy the two effects of the scale blowout of the forging surface and the instantaneous heating of the forging surface by the heat of FeO formation. As in JP-A-53-90148, there is a method in which the direction of oxygen blow is set to the opposite direction with respect to the traveling direction of the tubular skelp to prevent scale biting at the forged joint surface. For,
There is a problem that the temperature decreases near the forging contact, and a sufficient forging temperature cannot be maintained, resulting in poor forging welding. In the figure, 6 indicates a forged roll. It is an object of the present invention to completely remove the scale of the forged surface of the edge portion of the tubular skelp, maintain a sufficient forged temperature, and solve the above problem of forged welding.
【０００４】[0004]
【課題を解決するための手段】本発明は、材料となる鋼
帯を加熱炉で加熱し加熱された鋼帯を管状に熱間成形
後、管状スケルプのエッジ部の鍛接面に鍛接直前のウェ
ルディングホーンのノズルから管状スケルプの進行方向
と同方向に酸素ブローをし鍛接する鍛接鋼管の製造工程
において、加熱炉および熱間成形中に生成されたスケー
ルを管状スケルプのエッジ部の鍛接面から鍛接直前で完
全に除去するために、鍛接直前の酸素ブローに加えて成
形ロールと鍛接ロールの中間にディスク状の回転ブラシ
を設置することを特徴とする鍛接部高強度、高品質の鍛
接鋼管の製造方法である。According to the present invention, a steel strip which is a material is heated in a heating furnace, and the heated steel strip is hot-formed into a tubular shape. In the manufacturing process of a forged steel pipe in which oxygen is blown from the nozzle of the Dinghorn in the same direction as the tubular skelp is advancing, the scale produced during the heating furnace and hot forming is forged from the forged surface of the edge of the tubular skelp. Manufacturing of high-strength, high-quality forged steel pipe at the forged part, characterized by installing a rotary brush in the middle of the forming roll and the forging roll in addition to oxygen blow just before forging in order to completely remove just before forging. Is the way.
【０００５】本発明を図１、図２に基づき詳細に説明す
る。The present invention will be described in detail with reference to FIGS.
【０００６】本発明の特徴は鍛接直前のウェルディング
ホーン５からの酸素ブローに加えて成形ロール３，４と
鍛接ロール６の中間にディスク状の回転ブラシ８を設置
することにある。前述のような従来法の欠点を解消する
ため図１、図２に示すように、鍛接直前のウェルディン
グホーン５からの酸素ブローに加えて成形ロール４と鍛
接ロール６の中間にディスク状の回転ブラシ８を設置
し、管状スケルプ１の両エッジ部の間にはさみ両エッジ
部を押しつけるように装着し管状スケルプの進行方向に
対して逆方向に回転させる。熱間成形安定化のために設
置した成形ロール４はエッジ座屈、ねじれの成形に起因
する品質不良を減少させるが、一般には設置していない
場合もある。設置していない場合のディスク状の回転ブ
ラシ８の取り付け位置は成形ロール３と鍛接ロール６の
中間にする。その結果、管状スケルプ１のエッジ部の鍛
接面のスケールは完全に除去されるためスケールが鍛接
部に噛み込んで夾雑物となることがない。ディスク状の
回転ブラシは管状スケルプのエッジ部の鍛接面に管状ス
ケルプの進行方向に対して平行かつ一定傾斜角度をなし
て接触させ、管状スケルプの進行方向に対して逆向きに
回転させる。ブラシは一箇所での摩耗を防ぐため回転さ
せ、ブラシの回転速度が高速になるに従い管状スケルプ
のエッジ部にブラシが接触する面積が増大しスケールが
除去されやすくなる。その結果、管状スケルプのエッジ
部の鍛接面に付着していたスケールは完全に除去され、
スケールが鍛接点付近に侵入することが無くなる。成形
ロールと鍛接ロールの中間にディスク状の回転ブラシを
設置することによりスケールが鍛接部に噛み込むことが
完全に解消される。ディスク状の回転ブラシを成形ロー
ルと鍛接ロールの中間に設置することにより鍛接直前で
のウェルディングホーンからの酸素ブローは管状スケル
プの進行方向と同方向でまさに鍛接直前で鍛接面を昇温
する効果の目的のみ使用可能となり、その結果十分な鍛
接温度の保持が可能となり鍛接部高強度、高品質な鍛接
鋼管を容易に製造することができる。A feature of the present invention is that, in addition to oxygen blowing from the welding horn 5 immediately before forging, a disk-shaped rotary brush 8 is installed between the forming rolls 3 and 4 and the forging roll 6. In order to eliminate the above-mentioned drawbacks of the conventional method, as shown in FIGS. 1 and 2, in addition to oxygen blowing from the welding horn 5 immediately before forging, a disc-shaped rotation is made between the forming roll 4 and the forging roll 6. The brush 8 is installed, and it is mounted so as to press the both edges of the tubular skelp 1 between the both edges of the tubular skelp 1 by pressing them and rotate them in the direction opposite to the traveling direction of the tubular skelp. The forming roll 4 installed to stabilize hot forming reduces quality defects due to edge buckling and twisting forming, but it may not be installed in general. When not installed, the disk-shaped rotary brush 8 is attached at a position midway between the forming roll 3 and the forging roll 6. As a result, the scale on the forged surface of the edge portion of the tubular skelp 1 is completely removed, so that the scale does not get caught in the forged portion and become a contaminant. The disk-shaped rotating brush is brought into contact with the forged surface of the edge portion of the tubular skelp in parallel with the traveling direction of the tubular skelp at a constant inclination angle, and is rotated in the direction opposite to the traveling direction of the tubular skelp. The brush is rotated in order to prevent abrasion at one place, and as the rotating speed of the brush becomes higher, the area in which the brush comes into contact with the edge portion of the tubular skelp increases and the scale is easily removed. As a result, the scale attached to the forged surface of the edge of the tubular skelp was completely removed,
The scale does not enter near the forged contact. By installing a disc-shaped rotating brush between the forming roll and the forging roll, it is possible to completely eliminate the biting of the scale in the forging part. By installing a disk-shaped rotating brush between the forming roll and the forging roll, the oxygen blow from the welding horn just before forging is in the same direction as the traveling direction of the tubular skelp and just raises the temperature of the forging surface just before forging. Therefore, it is possible to maintain a sufficient forge-welding temperature, and it is possible to easily produce a high-strength forged-welded steel pipe with high strength.
【０００７】[0007]
【実施例】図１、２に示す本発明法の製造工程によるデ
ィスク状の回転ブラシの回転数および実用試験結果を第
１表に示す。図３に示す従来法の製造工程による実用試
験結果を第２表に示す。第１表、第２表に示す偏平率、
押し拡げ率の計算方法をそれぞれ下式に示す。EXAMPLES Table 1 shows the rotational speeds and practical test results of the disk-shaped rotary brushes according to the manufacturing process of the method of the present invention shown in FIGS. Table 2 shows the results of practical tests by the manufacturing process of the conventional method shown in FIG. The flatness ratios shown in Table 1 and Table 2,
The formulas for calculating the expansion ratio are shown below.
【０００８】偏平率＝（１−Ｈ／Ｄ）×１００（％）
Ｄ：素管外径 Ｈ：偏平高さ 押し拡げ率＝Ｄ’／Ｄ Ｄ：素管外径 Ｄ’：拡
管後の外径Flatness == (1-H / D) × 100 (%)
D: Outer diameter of base pipe H: Flat height Push expansion ratio = D '/ D D: Outer diameter of base pipe D': Outer diameter after expansion
【０００９】[0009]
【表１】 [Table 1]
【００１０】[0010]
【表２】 [Table 2]
【００１１】第１表、第２表に示すとおり、本発明法の
製造工程による鍛接鋼管は従来法の製造工程による鍛接
鋼管に比べ、偏平率、押し拡げ率が高く鍛接部の夾雑物
噛み込みも無く、鍛接部高強度、高品質の鍛接鋼管を製
造することができた。As shown in Tables 1 and 2, the forged steel pipe manufactured by the manufacturing process of the present invention has a higher flatness and push-expansion ratio than the forged steel pipe manufactured by the conventional manufacturing process, and the inclusion of impurities in the forged region. It was possible to manufacture a high-strength welded steel pipe with high strength at the forged portion.
【００１２】今回、試験に用いたディスク状の回転ブラ
シの外径、幅、素線径を管サイズごとに第３表に示す。The outer diameter, width, and wire diameter of the disk-shaped rotating brush used in the test are shown in Table 3 for each tube size.
【００１３】[0013]
【表３】 [Table 3]
【００１４】[0014]
【発明の効果】従来法の製造工程による酸素ブローする
位置は鍛接直前で、しかも管状スケルプの進行方向と同
方向であるためスケールが完全に管状スケルプのエッジ
部付近から除去できず、また吹き飛ばされたスケールが
鍛接点付近に侵入してスケールが鍛接面に噛み込み鍛接
部の強度、品質を低下させる問題点があったが、本発明
の方法を適用することにより鍛接部のスケール噛み込み
が解消され鍛接部高強度、高品質の鍛接鋼管の製造が可
能となった。EFFECTS OF THE INVENTION According to the manufacturing process of the conventional method, oxygen is blown immediately before forging, and since the scale is in the same direction as the traveling direction of the tubular skelp, the scale cannot be completely removed from the vicinity of the edge of the tubular skelp and is blown off. There was a problem that the scale entered the vicinity of the forged contact and the scale was caught in the forged contact surface to lower the strength and quality of the forged contact part, but the application of the method of the present invention eliminates the scale entrapment in the forged contact part. It is now possible to manufacture high-strength, high-quality forged steel pipe at the forged portion.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明法の鍛接鋼管の製造方法を示す平面図。FIG. 1 is a plan view showing a method for manufacturing a forged steel pipe according to the method of the present invention.
【図２】本発明法のディスク状の回転ブラシ付近の断面
図。FIG. 2 is a cross-sectional view around a disk-shaped rotating brush according to the method of the present invention.
【図３】従来法の鍛接鋼管の製造工程を示す平面図。FIG. 3 is a plan view showing a manufacturing process of a conventional forged steel pipe.
１…鋼帯 ２…加熱炉 ３…成形ロール ４…成形ロール ５…ウェルディングホーン ６…鍛接ロール ７…ノズル ８…回転ディスク
状のブラシDESCRIPTION OF SYMBOLS 1 ... Steel strip 2 ... Heating furnace 3 ... Forming roll 4 ... Forming roll 5 ... Welding horn 6 ... Forging roll 7 ... Nozzle 8 ... Rotating disc brush
───────────────────────────────────────────────────── フロントページの続き (72)発明者 尾形佳紀 君津市君津１番地 新日本製鐵株式会社君 津製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Ogata 1 Kimitsu, Kimitsu City Nippon Steel Corporation Kimitsu Steel Works
Claims (1)
れた鋼帯を管状に熱間成形後、管状スケルプのエッジ部
の鍛接面に鍛接直前のウェルディングホーンのノズルか
ら管状スケルプの進行方向と同方向に酸素ブローをし鍛
接する鍛接鋼管の製造工程において、加熱炉および熱間
成形中に生成されたスケールを管状スケルプのエッジ部
の鍛接面から鍛接直前で完全に除去するため鍛接直前の
酸素ブローに加えて成形ロールと鍛接ロールの中間にデ
ィスク状の回転ブラシを設置することを特徴とする鍛接
部高強度、高品質の鍛接鋼管の製造方法1. A steel strip as a material is heated in a heating furnace, and the heated steel strip is hot-formed into a tubular shape. Then, the forged surface of the edge portion of the tubular skelp is welded to the tubular skelp from the nozzle of the welding horn immediately before forging. In the manufacturing process of forged steel pipes in which oxygen is blown in the same direction as the advancing direction, the scale produced during the heating furnace and hot forming is completely removed from the forged surface of the tubular skelp edge just before the forged welding. A method for producing a high-strength, high-quality forged steel pipe at the forged portion, characterized by installing a disc-shaped rotating brush between the forming roll and the forging roll in addition to the immediately preceding oxygen blow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7058458A JPH08252629A (en) | 1995-03-17 | 1995-03-17 | Production of forge welded steel tube of high strength, high quality of forge welded part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7058458A JPH08252629A (en) | 1995-03-17 | 1995-03-17 | Production of forge welded steel tube of high strength, high quality of forge welded part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08252629A true JPH08252629A (en) | 1996-10-01 |
Family
ID=13084989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7058458A Withdrawn JPH08252629A (en) | 1995-03-17 | 1995-03-17 | Production of forge welded steel tube of high strength, high quality of forge welded part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08252629A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921766A (en) * | 2012-11-13 | 2013-02-13 | 河北宏润重工股份有限公司 | Scale removing equipment of high temperature preform body in seamless steel tube hot extrusion process |
| CN103286155A (en) * | 2012-05-09 | 2013-09-11 | 深圳市北科航飞生物医学工程有限公司 | Manufacturing method of cobalt/iron composite tube for coronary stent and auxiliary equipment |
-
1995
- 1995-03-17 JP JP7058458A patent/JPH08252629A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103286155A (en) * | 2012-05-09 | 2013-09-11 | 深圳市北科航飞生物医学工程有限公司 | Manufacturing method of cobalt/iron composite tube for coronary stent and auxiliary equipment |
| CN103286155B (en) * | 2012-05-09 | 2016-08-03 | 北京大学深圳研究院 | The manufacture method of cobalt/iron composite tube for coronary stent and auxiliary equipment |
| CN102921766A (en) * | 2012-11-13 | 2013-02-13 | 河北宏润重工股份有限公司 | Scale removing equipment of high temperature preform body in seamless steel tube hot extrusion process |
| CN102921766B (en) * | 2012-11-13 | 2015-11-04 | 河北宏润核装备科技股份有限公司 | The scale removal equipment of high temperature blank in seamless steel pipe hot extrusion technique |
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