JPH06238488A - Production of coiled steel pipe and pipe stock for coiled steel pipe - Google Patents
Production of coiled steel pipe and pipe stock for coiled steel pipeInfo
- Publication number
- JPH06238488A JPH06238488A JP4991593A JP4991593A JPH06238488A JP H06238488 A JPH06238488 A JP H06238488A JP 4991593 A JP4991593 A JP 4991593A JP 4991593 A JP4991593 A JP 4991593A JP H06238488 A JPH06238488 A JP H06238488A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- coiled steel
- electric resistance
- coiled
- resistance welded
- 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
Landscapes
- Milling, Broaching, Filing, Reaming, And Others (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電縫溶接鋼管からコイ
ル状鋼管の製造方法及びコイル状鋼管に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a coiled steel pipe from an electric resistance welded steel pipe and a coiled steel pipe.
【０００２】[0002]
【従来の技術】コイル状鋼管は、鍛接鋼管、電縫溶接鋼
管、シームレス鋼管等を素管として熱間ストレッチレデ
ューサーにより絞り圧延した後、コイル状に巻き取って
製造されている。従来コイル状鋼管用素管として低価格
の電縫溶接鋼管が使用されている。しかしながら、前記
電縫溶接鋼管は管内面のビードを切削等により除去して
いるが、内面ビード切削部は、その切削条件により該電
縫溶接鋼管の内面表面に対して−３００μｍから＋３０
０μｍの範囲に切削加工を行っていた。該コイル状鋼管
は、引き抜き加工、冷間鍛造、転造加工、ネジ切削加工
等の二次加工し、各種配管及び機械部品等に使用されて
いる。2. Description of the Related Art Coil-shaped steel pipe is manufactured by squeezing a forged welded steel pipe, an electric resistance welded steel pipe, a seamless steel pipe or the like as a raw pipe by a hot stretch reducer and then winding it into a coil. Conventionally, low-priced electric resistance welded steel pipe has been used as a raw pipe for coiled steel pipe. However, the bead on the inner surface of the electric resistance welded steel pipe is removed by cutting or the like, but the bead cutting portion on the inner surface has a cutting condition of −300 μm to +30 with respect to the inner surface of the electric resistance welded steel pipe.
Cutting was performed in the range of 0 μm. The coiled steel pipe is subjected to secondary processing such as drawing, cold forging, rolling, and thread cutting, and is used for various pipes, machine parts and the like.
【０００３】一方、高度の冷間加工性が要求される自動
車用材料、産業機械部品用等は、一般に表面疵深さを厳
しく管理した材料が使用されている。そのため従来のコ
イル状鋼管を使用して冷間鍛造、転造加工する場合、加
工割れが発生するためその生産性に支障をきたしてい
た。On the other hand, for automobile materials, industrial machine parts, etc., which require a high degree of cold workability, materials whose surface flaw depth is strictly controlled are generally used. Therefore, when cold forging or rolling is performed using a conventional coiled steel pipe, work cracks occur, which hinders productivity.
【０００４】[0004]
【発明が解決しようとする課題】電縫溶接鋼管内面の内
面ビードを従来の方法で切削除去されたコイル状鋼管用
素管から製造されたコイル状鋼管を、苛酷な冷間加工し
た場合、加工割れが発生していた。発明者等は、数多く
の実験・評価を行い、該加工割れ原因はコイル状鋼管の
内面溶接部近傍のシワ疵深さに起因し、該シワ疵深さが
＋２０μｍ以下では加工割れが発生しないことを見出し
た。[Problems to be Solved by the Invention] When a coiled steel pipe manufactured from a raw material for coiled steel pipe in which the inner bead of the inner surface of the electric resistance welded steel pipe is removed by a conventional method is subjected to severe cold working, There was a crack. The inventors have conducted numerous experiments and evaluations, and the cause of the work crack is due to the wrinkle flaw depth near the inner surface welded portion of the coiled steel pipe, and the work crack does not occur when the wrinkle flaw depth is +20 μm or less. Found.
【０００５】本発明は、前記のコイル状鋼管の内面ビー
ド部に発生した内面シワ疵による冷間加工時の割れを防
止するために、コイル状鋼管用素管を製造するに際し、
電縫溶接鋼管の内面ビード高さを特定領域に管理して該
コイル状鋼管の内面溶接部近傍のシワ疵を防止し、冷間
加工性を向上させることを目的としている。In order to prevent cracking during cold working due to inner wrinkles formed in the inner bead portion of the coiled steel pipe, the present invention provides a method for producing a coiled steel pipe blank tube,
The purpose is to manage the bead height on the inner surface of the electric resistance welded steel pipe in a specific region to prevent wrinkles and flaws near the inner surface welded portion of the coiled steel pipe, and to improve the cold workability.
【０００６】[0006]
【課題を解決するための手段】本発明は、熱間絞り圧延
して得られたコイル状鋼管の内面溶接部近傍のシワ疵の
生成を防止するために、電縫溶接鋼管の内面ビード高さ
を特定の領域にしたことを特徴とする冷間加工性の優れ
たコイル状鋼管の製造方法及びそのコイル状鋼管を提供
するものである。その要旨とするところは、電縫溶接鋼
管を用いて、熱間絞り圧延してコイル状鋼管を製造する
際に、該電縫溶接鋼管の内面ビード部を切削又は／及び
研削してビード高さを−２００μｍ〜＋２０μｍとし、
続いて熱間絞り圧延し、コイル状に巻き取りコイル状鋼
管を製造する方法である。DISCLOSURE OF THE INVENTION In order to prevent the formation of wrinkles in the vicinity of the inner surface welded portion of a coiled steel pipe obtained by hot drawing and rolling, the present invention provides an inner surface bead height of an electric resistance welded steel pipe. The present invention provides a method for producing a coiled steel pipe having excellent cold workability, which is characterized in that a specific region is provided, and the coiled steel pipe. The gist of the point is that, when a coil-shaped steel pipe is manufactured by hot drawing and rolling using an electric resistance welded steel pipe, the bead height is obtained by cutting or / and grinding the inner bead portion of the electric resistance welded steel pipe. Is -200 μm to +20 μm,
Then, it is a method of producing a coiled steel tube by winding it into a coil by hot drawing and rolling.
【０００７】また、電縫溶接鋼管の内面ビード高さが−
２００μｍ〜＋２０μｍであるコイル状鋼管用素管であ
る。The height of the bead on the inner surface of the electric resistance welded steel pipe is-
It is a coil-shaped steel pipe base pipe having a diameter of 200 μm to +20 μm.
【０００８】[0008]
【作用】以下に本発明のコイル状鋼管の製造方法及びコ
イル状鋼管について述べる。本発明のコイル状鋼管の製
造方法及びコイル状鋼管は、図２に示すように電縫溶接
ミル１で造管された電縫溶接鋼管１１の内面ビードを内
面切削装置４で−２００μｍから＋２０μｍ高さに切削
し、続いて内面ビードを切削した電縫溶接鋼管１２を加
熱炉５で加熱し、電縫溶接鋼管を熱間絞り圧延する。続
いて該圧延管１３を巻取機８でコイル状に巻き取ること
によりコイル状鋼管１４を製造する。The following will describe the method for manufacturing a coiled steel pipe and the coiled steel pipe of the present invention. The method for manufacturing a coiled steel pipe and the coiled steel pipe of the present invention are, as shown in FIG. Then, the electric resistance welded steel pipe 12 whose inner surface beads have been cut is heated in the heating furnace 5, and the electric resistance welded steel pipe is hot-squeeze rolled. Subsequently, the rolled pipe 13 is wound into a coil by the winder 8 to manufacture the coiled steel pipe 14.
【０００９】電縫溶接鋼管１１は、電縫溶接ミルで製造
された炭素鋼、低合金鋼、ステンレス鋼からなる鋼管を
用いることができる。電縫溶接鋼管を加熱する加熱炉５
は、バレル炉、ウォーキングビーム炉、誘導加熱炉等を
用いることができる。As the electric resistance welded steel pipe 11, a steel pipe manufactured by an electric resistance welded mill and made of carbon steel, low alloy steel or stainless steel can be used. Heating furnace for heating ERW welded steel pipe 5
Can use a barrel furnace, a walking beam furnace, an induction heating furnace, or the like.
【００１０】ストレッチレデューサー６は、２ロール又
は３ロールのロールハウジングを連続的に１０〜３０ス
タンド配列した圧延機であり、鋼管１２は外径が順次圧
延されながら相隣するスタンド間の周速の差によって軸
方向に延伸されて、所望の外径、肉厚となった圧延管１
３は、ピンチローラ７で誘導され、巻取機８で巻き取ら
れてコイル状鋼管１４となる。The stretch reducer 6 is a rolling mill in which roll housings of 2 rolls or 3 rolls are continuously arranged in an array of 10 to 30 stands, and the steel pipe 12 has an outer diameter sequentially rolled and a peripheral speed between adjacent stands. Rolled tube 1 stretched in the axial direction due to the difference to have a desired outer diameter and wall thickness
3 is guided by a pinch roller 7 and wound by a winder 8 to form a coiled steel pipe 14.
【００１１】電縫溶接鋼管を用いて、熱間絞り圧延して
コイル状鋼管を製造する際に、該電縫溶接鋼管の内面ビ
ード高さを−２００μｍ以上、＋２０μｍ以下に限定し
た理由は以下の通りである。供試鋼をＳ３０Ｃとし、外
径が８９．１ｍｍ，肉厚が４．８ｍｍの電縫溶接鋼管を
造管し、その造管直後、内面ビード除去方法は二段バイ
ト切削及び二段バイト切削＋回転砥石削により内面ビー
ド高さを＋１２０μｍから−２４０μｍの範囲に調整
し、加熱温度を１０００℃から１０４０℃，噛込温度を
９８０℃から１０２０℃，熱間絞り圧延終了温度を７３
５℃から７５５℃の範囲で外径が２５．４ｍｍ，肉厚が
４．８ｍｍのコイル状鋼管を製造した後、前記コイル状
鋼管の内面シワ疵を光学顕微鏡で測定した。The reason why the inner bead height of the electric resistance welded steel pipe is limited to -200 μm or more and +20 μm or less when the coil-shaped steel pipe is manufactured by hot drawing rolling using the electric resistance welded steel pipe is as follows. On the street. The steel to be tested is S30C, and an electric resistance welded steel pipe with an outer diameter of 89.1 mm and a wall thickness of 4.8 mm is made. Immediately after the pipe making, the inner bead removal method is two-step cutting and two-step cutting + The inner surface bead height was adjusted in the range of +120 μm to −240 μm by rotary grinding, the heating temperature was 1000 ° C. to 1040 ° C., the biting temperature was 980 ° C. to 1020 ° C., and the hot drawing rolling end temperature was 73.
After producing a coiled steel pipe having an outer diameter of 25.4 mm and a wall thickness of 4.8 mm in the range of 5 ° C to 755 ° C, the inner surface wrinkles of the coiled steel pipe were measured with an optical microscope.
【００１２】その結果を図１に示すように内面ビード高
さが−２００μｍ未満になると熱間絞り圧延過程で内面
溶接部近傍に内面シワ疵が発生する。また、内面ビード
高さが＋２０μｍを越えると熱間絞り圧延過程で鋼管内
表面と内面ビード部との境界部に内面シワ疵が発生す
る。該内面シワ疵は冷間鍛造加工，転造加工時の加工割
れ起点となる。前記理由により電縫溶接鋼管の内面ビー
ド高さを−２００μｍ以上，２０μｍ以下に限定した。As a result, as shown in FIG. 1, when the inner surface bead height is less than -200 μm, inner surface wrinkles are generated in the vicinity of the inner surface welded portion in the hot drawing rolling process. Further, if the inner bead height exceeds +20 μm, inner wrinkles are generated at the boundary between the inner surface of the steel pipe and the inner bead during the hot-drawing process. The inner surface wrinkles are the starting points of work cracks during cold forging and rolling. For the above reason, the inner bead height of the electric resistance welded steel pipe is limited to -200 μm or more and 20 μm or less.
【００１３】該電縫溶接鋼管の内面ビード高さを−２０
０μｍから２０μｍ以下に制御する方法として、例え
ば、多段バイト（二から四段）切削、回転砥石研削等で
行えばよい。即ち、一段もしくは二段バイトで粗切削し
た後、三段もしくは四段バイトで仕上げ切削する。又は
一段もしくは二段バイトで粗切削した後、回転砥石研削
により仕上げ研削する。切削面又は研削面は、常に該電
縫溶接鋼管の内表面に追従するように切削バイト及び回
転砥石研削装置の反対側及び両側面にスピリングシャフ
トの先端に制御ロールを取付けて該電縫溶接鋼管の内表
面からの切削量を制御した。The inner bead height of the electric resistance welded steel pipe is set to -20.
As a method of controlling from 0 μm to 20 μm or less, for example, multi-step cutting (two to four steps) cutting, rotary grindstone grinding or the like may be performed. That is, after roughly cutting with a one- or two-step cutting tool, finish cutting with a three-step or four-step cutting tool. Alternatively, after roughly cutting with a single-stage or double-stage cutting tool, finish grinding is performed with a rotary grindstone. The cutting surface or the grinding surface should always follow the inner surface of the electric resistance welded steel pipe by attaching a control roll to the tip of the spilling shaft on the opposite side and both sides of the cutting bite and the rotary grindstone grinding device. The cutting amount from the inner surface of the steel pipe was controlled.
【００１４】[0014]
【実施例】以下に、本発明の実施例についてその効果を
述べる。炭素鋼及びステンレス鋼を用いて、電縫溶接鋼
管の溶接部の内面ビート高さをかえて熱間絞り圧延によ
り製造したコイル状鋼管の品質特性、即ち内面溶接部近
傍の内面シワ疵深さ，冷間加工性を評価した結果を表１
に示す。The effects of the embodiments of the present invention will be described below. Using carbon steel and stainless steel, quality characteristics of the coiled steel pipe manufactured by hot drawing rolling by changing the inner surface beat height of the welded portion of the electric resistance welded steel pipe, that is, inner surface wrinkle depth near the inner surface welded portion, Table 1 shows the results of evaluation of cold workability.
Shown in.
【表１】 本発明の製造方法により製造されたコイル状鋼管は、冷
間加工性に有害な内面シワ疵がないため、該コイル状鋼
管の限界圧縮率は高く、従来の該コイル状鋼管に比して
冷間加工性が大幅に向上する。[Table 1] Since the coiled steel pipe manufactured by the manufacturing method of the present invention has no internal wrinkles that are harmful to cold workability, the critical compression rate of the coiled steel pipe is high and the coiled steel pipe is colder than the conventional coiled steel pipe. The inter-workability is greatly improved.
【００１５】[0015]
【発明の効果】本発明のコイル状鋼管の製造方法は、熱
間絞り圧延してコイル状鋼管を製造する際、内面ビード
高さを特定領域に制御した電縫溶接鋼管を用いることに
より熱間絞り圧延過程で内面溶接部近傍の内面シワ疵発
生が防止できる。更に本発明により製造されたコイル状
鋼管は、内面溶接部近傍の内面シワ疵発生防止を図った
っものであり、従来のコイル状鋼管に比べて冷間加工性
を飛躍的に向上させたものであり、工業的価値は絶大で
ある。The method for producing a coiled steel pipe according to the present invention is such that, when a coiled steel pipe is produced by hot drawing and rolling, by using an electric resistance welded steel pipe whose inner bead height is controlled in a specific region, It is possible to prevent the generation of wrinkles on the inner surface in the vicinity of the inner surface welded portion during the drawing and rolling process. Furthermore, the coiled steel pipe manufactured according to the present invention is intended to prevent the generation of inner surface wrinkles in the vicinity of the inner surface welded portion, and has dramatically improved cold workability as compared with the conventional coiled steel pipe. Yes, the industrial value is enormous.
【図１】コイル状鋼管用素管の内面ビート高さとコイル
状鋼管の内面シワ疵深さとの関係を示す図である。FIG. 1 is a diagram showing the relationship between the inner surface beat height of a coiled steel pipe and the inner surface wrinkle depth of the coiled steel pipe.
【図２】本発明のコイル状鋼管の製造方法の一例を示す
図である。FIG. 2 is a diagram showing an example of a method for manufacturing a coiled steel pipe of the present invention.
１ 電縫溶接ミル ２ 誘導コイル ３ スクイズロール ４ 内面切削装置 ５ 加熱炉 ６ ストレッチレデューサー ７ ピンチロール ８ 巻取機 １１ 電縫溶接管 １２ 内面ビード高さを制御した電縫溶接管 １３ 圧延管 １４ コイル状鋼管 1 ERW Welding Mill 2 Induction Coil 3 Squeeze Roll 4 Inner Cutting Device 5 Heating Furnace 6 Stretch Reducer 7 Pinch Roll 8 Winder 11 ERW Welded Pipe 12 ERW Welded Pipe with Inner Bead Height Control 13 Rolled Pipe 14 Coil Steel pipe
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２３Ｋ 31/00 7920−4Ｅ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location B23K 31/00 7920-4E
Claims (2)
コイル状鋼管を製造する際に、該電縫溶接鋼管の内面ビ
ード部を切削又は／及び研削してビード高さを−２００
μｍ〜＋２０μｍとし、続いて熱間絞り圧延し、コイル
状に巻き取りコイル状鋼管を製造することを特徴とする
コイル状鋼管の製造方法。1. When producing a coiled steel pipe by hot drawing and rolling using an electric resistance welded steel pipe, an inner surface bead portion of the electric resistance welded steel pipe is cut or / and ground to reduce a bead height. 200
A method for producing a coiled steel pipe, which comprises producing a coiled steel pipe having a thickness of μm to +20 μm, followed by hot drawing and rolling into a coil.
μｍ〜＋２０μｍであることを特徴とするコイル状鋼管
用素管。2. The inner bead height of the electric resistance welded steel pipe is -200.
A coiled steel pipe blank for a steel pipe, characterized in that the diameter is from μm to +20 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4991593A JPH06238488A (en) | 1993-02-17 | 1993-02-17 | Production of coiled steel pipe and pipe stock for coiled steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4991593A JPH06238488A (en) | 1993-02-17 | 1993-02-17 | Production of coiled steel pipe and pipe stock for coiled steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06238488A true JPH06238488A (en) | 1994-08-30 |
Family
ID=12844313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4991593A Pending JPH06238488A (en) | 1993-02-17 | 1993-02-17 | Production of coiled steel pipe and pipe stock for coiled steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06238488A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11440125B2 (en) * | 2018-03-29 | 2022-09-13 | Jfe Steel Corporation | Electric resistance welded steel pipe for producing hollow stabilizer, hollow stabilizer, and production methods for same |
-
1993
- 1993-02-17 JP JP4991593A patent/JPH06238488A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11440125B2 (en) * | 2018-03-29 | 2022-09-13 | Jfe Steel Corporation | Electric resistance welded steel pipe for producing hollow stabilizer, hollow stabilizer, and production methods for same |
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|---|---|---|---|
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