JPH0734927B2 - Method for manufacturing seamless steel pipe - Google Patents
Method for manufacturing seamless steel pipeInfo
- Publication number
- JPH0734927B2 JPH0734927B2 JP29666886A JP29666886A JPH0734927B2 JP H0734927 B2 JPH0734927 B2 JP H0734927B2 JP 29666886 A JP29666886 A JP 29666886A JP 29666886 A JP29666886 A JP 29666886A JP H0734927 B2 JPH0734927 B2 JP H0734927B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- seamless steel
- outer diameter
- pipe
- rolled
- 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.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- 229910000831 Steel Inorganic materials 0.000 title claims description 18
- 239000010959 steel Substances 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 14
- 238000005096 rolling process Methods 0.000 claims description 24
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 description 5
- 238000005553 drilling Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Control Of Metal Rolling (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は継目無鋼管の製造方法、特に肉厚／管外径が
0.2以上である厚肉継目無鋼管をマンネスマン穿孔方式
により製造する方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is directed to a method for producing a seamless steel pipe, particularly in terms of wall thickness / pipe outside diameter.
The present invention relates to a method for producing a thick seamless steel pipe having a thickness of 0.2 or more by a Mannesmann drilling method.
（従来の技術） マンネスマン穿孔方式による継目無鋼管の製造工程は、
第３図に示すように穿孔圧延工程、延伸圧延工程および
成形圧延工程よりなっている。(Prior art) The manufacturing process of seamless steel pipe by the Mannesmann drilling method is
As shown in FIG. 3, it comprises a piercing rolling process, a stretching rolling process and a forming rolling process.
穿孔圧延工程は、マンネスマン式ピアサーにより丸ビレ
ットを穿孔して素管を得る。延伸圧延工程は得られた素
管をプラグミルにより長尺に延伸することにより肉厚お
よび外径を圧下するとともに内外面の性状を良好にす
る。また、成形圧延工程は長尺の素管をリーラー、サイ
ザー、レデューサー、ストレッチレデューサーなどによ
り所定の寸法に仕上げる。In the piercing and rolling process, a round billet is pierced by a Mannesmann piercer to obtain a raw pipe. In the stretching / rolling step, the obtained tube is elongated by a plug mill to reduce the wall thickness and outer diameter and to improve the properties of the inner and outer surfaces. In the forming and rolling step, a long raw tube is finished to a predetermined size by a reeler, sizer, reducer, stretch reducer, or the like.
（発明が解決しようとする問題点） 肉厚／管外径が0.2以上の厚肉管は同一外径の薄肉管よ
りも管断面積がかなり大きくなるので、厚肉管を製造す
る場合、同一長さ、同一外径の薄肉管に比較して、より
大きな体積の素材を必要とする。たとえば、外径165mm
（6 1/2″）、肉厚50.8mm（２″）、および長さ9.8mm
（32′）の素管を通常の穿孔機で穿孔圧延するために
は、外径165mm、長さ9.0mmの丸ビレットを必要とする。
一方、国内の一般的な継目無鋼管製造設備では、既存の
素材加熱炉で加熱できるビレットの最大長さは今のとこ
ろ約5mである。したがって、上記のような長尺の厚肉管
を製造しようとすると、丸ビレットを加熱することがで
きなかった。もちろん、誘導加熱により丸ビレットを加
熱することができるが、設備費が膨大なものとなる。(Problems to be solved by the invention) A thick-walled pipe having a wall thickness / outer diameter of 0.2 or more has a significantly larger cross-sectional area than a thin-walled pipe having the same outer diameter. It requires a larger volume of material than a thin-walled tube of the same length and outer diameter. For example, outer diameter 165mm
(6 1/2 "), wall thickness 50.8mm (2"), and length 9.8mm
A round billet with an outer diameter of 165 mm and a length of 9.0 mm is required in order to pierce and roll a (32 ') blank tube with a normal piercing machine.
On the other hand, the maximum length of billet that can be heated by the existing material heating furnace is about 5 m so far in general domestic seamless steel pipe manufacturing equipment. Therefore, it was not possible to heat the round billet when attempting to manufacture the above-described long thick-walled tube. Of course, the round billet can be heated by induction heating, but the equipment cost becomes enormous.
そこで、既存の素材加熱炉が利用できるようにビレット
の長さを短くし（5m以下）、外径を大きくすることが考
えられる。たとえば、製品外径134.5mm（5 1/4″）、内
径56.7mm、長さ9.8mm（32′）の長尺厚肉管を製造する
の場合、必要とするビレットサイズは直径173mm、長さ5
mとなりこのビレットを用いるとする。この場合、製品
サイズから積み上げた圧延スケジュールによれば、マン
ネスマン式ピアサーで穿孔した外径173mmの素管をプラ
グミルにより外径156mmまで延伸圧延し、これをサイザ
ーまたはストレッチレデューサーにより外径134.5mmま
で絞り圧延する。しかし、この方法ではプラグミルにお
いて素管を延伸圧延することができないという問題があ
る。すなわち、素管の内径が小さいため、素管内にプラ
グを挿入することが困難であり、挿入されたとしてもプ
ラグを支持するマンドレルバーが細いため座屈したり、
振動したりするという問題があった。Therefore, it is possible to shorten the billet length (5 m or less) and increase the outer diameter so that the existing material heating furnace can be used. For example, when manufacturing a long-walled tube with an outer diameter of 134.5 mm (5 1/4 ″), an inner diameter of 56.7 mm, and a length of 9.8 mm (32 ′), the required billet size is 173 mm in diameter and length. Five
m and use this billet. In this case, according to the rolling schedule piled up from the product size, a blank tube with an outer diameter of 173 mm perforated with a Mannesmann piercer is stretch-rolled to an outer diameter of 156 mm by a plug mill, and this is drawn down to an outer diameter of 134.5 mm by a sizer or stretch reducer. To roll. However, this method has a problem that it is impossible to stretch-roll the raw pipe in the plug mill. That is, since the inner diameter of the raw pipe is small, it is difficult to insert the plug into the raw pipe, and even if it is inserted, the mandrel bar supporting the plug is thin and buckles,
There was a problem of vibration.
この発明の目的は、従来の方法では製造困難であった長
尺厚肉継目無鋼管をマンネスマン穿孔方式により製造す
ることができる方法を提供しようとするものである。An object of the present invention is to provide a method capable of manufacturing a long thick seamless steel pipe by a Mannesmann piercing method, which was difficult to manufacture by a conventional method.
（問題点を解決するための手段） この発明の継目無鋼管の製造方法では、第１図に示すよ
うに、まずビレットを素管に通常のマンネスマン式ピア
サーにより穿孔圧延する。この際、ピアサーのロール開
き量は91〜96％と従来のもよりも大きく設定することが
好ましい。ピアサーのロール開き量は、第２図に示すビ
レット１の直径DBに対するゴージ６におけるロール開き
DGの比DG/DBで表わされる。なお、第２図において参照
符号４は素管、５は穿孔ロール、７はプラグ、８はマン
ドレルバーをそれぞれ表わしている。(Means for Solving Problems) In the method for manufacturing a seamless steel pipe of the present invention, as shown in FIG. 1, a billet is first pierced and rolled by a normal Mannesmann piercer into a blank pipe. At this time, it is preferable that the roll opening amount of the piercer is set to 91 to 96%, which is larger than that in the conventional case. The roll opening amount of the piercer is the roll opening at the gorge 6 with respect to the diameter D B of the billet 1 shown in FIG.
Represented by the ratio D G / D B of the D G. In FIG. 2, reference numeral 4 is a blank tube, 5 is a piercing roll, 7 is a plug, and 8 is a mandrel bar.
ついで、半円形孔型をもつロール対により、かつ圧下方
向を90度変えて少なくとも２パスで前記素管を延伸圧延
する。この延伸圧延における外径圧下率は５％以上であ
る。外径圧下率の上限は延伸圧延機の圧延能力および肉
厚／管外径に依存する。延伸圧延機として、たとえば通
常のプラグミル（プラグは使用しない）、通常のマンド
レルミル（マンドレルバーは使用しない）、従来の連続
丸棒圧延機、または延伸圧延のために特別に設計した圧
延機を用いる。２パスで所要の寸法に圧延できない場合
には、３パス以上のパスで圧延する。なお、プラグミル
を用いる場合、素管をロール孔型に案内するために小径
のプラグを用いてもよい。もちろん、この場合にはプラ
グは素管の肉厚圧下には寄与しない。Then, the element pipe is stretch-rolled in at least two passes by using a pair of rolls having a semicircular hole shape and changing the rolling direction by 90 degrees. The outside diameter reduction ratio in this stretch rolling is 5% or more. The upper limit of the outer diameter reduction depends on the rolling ability of the drawing mill and the wall thickness / tube outer diameter. As a drawing and rolling mill, for example, a normal plug mill (without a plug), a normal mandrel mill (without a mandrel bar), a conventional continuous round bar rolling machine, or a rolling machine specially designed for drawing and rolling is used. . If it is not possible to roll to the required dimensions in two passes, roll in three or more passes. When a plug mill is used, a small diameter plug may be used to guide the blank tube into the roll hole type. Of course, in this case, the plug does not contribute to the wall thickness reduction of the blank tube.
さらに引き続いて、延伸圧延した素管を通常のようにサ
イザー、レデューサーまたはストレッチレデューサーに
より成形圧延する。これらサイザー等による外径圧下率
は１パス当り２％程度である。Further, subsequently, the stretch-rolled blank tube is shaped and rolled by a sizer, reducer or stretch reducer as usual. The outer diameter reduction rate by these sizers or the like is about 2% per pass.
（作用） マンネスマン式ピアサーにより穿孔された素管は、半円
形孔型をもつロール対により圧延することにより内、外
径が縮小されるとともに、管軸方向に延伸される。ま
た、圧下方向を90度変えて少なくとも２パスで圧延する
ことにより真円に近く圧延される。延伸圧延された素管
は、サイザー、レデューサー、またはストレッチレデュ
ーサーにより外面の性状が良好となるとともに所望の寸
法に仕上げられる。(Operation) The inner diameter of the raw pipe perforated by the Mannesmann piercer is reduced by rolling with a pair of rolls having a semicircular hole shape, and the pipe is stretched in the pipe axial direction. Further, the rolling direction is changed by 90 degrees and rolling is performed in at least two passes, so that rolling is performed close to a perfect circle. The stretch-rolled raw tube is finished to a desired size by the sizer, reducer, or stretch reducer having a good outer surface.
なお、上記のようにピアサーのロール開き量を大きくす
ることによって、穿孔時の回転鍛造効果は小さくなる。
そのことによって、もみわれ現象がなくなり、さらにプ
ラグの先端から圧延部に至る過程での材料とプラグの接
触面積が多くなるため内面が均一化され、良好な内面性
状となる。By increasing the roll opening amount of the piercer as described above, the rotary forging effect at the time of punching becomes small.
As a result, the cracking phenomenon disappears, and the contact area between the material and the plug in the process from the tip of the plug to the rolling portion increases, so that the inner surface is made uniform and good inner surface properties are obtained.
（実施例） ここで、この発明による極厚肉鋼管製造の実験例につい
て説明する。なお、寸法はmm単位であり、Ｄは外径、iD
は内径、ｌは長さをそれぞれ表わしている。(Example) Here, an experimental example of manufacturing an extremely thick steel pipe according to the present invention will be described. The dimensions are in mm, D is the outer diameter, iD
Represents the inner diameter and l represents the length.
ビレット寸法;D 173×l 5000 ビレット材質；低合金鋼 製品寸法;D 134.5×iD 56.7×l 9800 穿孔圧延工程 設備；マンネスマン式ピアサーロール開度 91％ 穿孔圧延された素管寸法;D 173×iD 97×l 7250 延伸圧延工程 設備；プラグミル（ただし、プラグ使用せず） 第１パスにおける外径圧下率 8.7％ 第２パスにおける外径圧下率 1.3％ 延伸圧延された素管の寸法;D 156×iD 79×l 8220 成形圧延工程 設備；サイザー＋絞り外径圧下率 14％ 成形圧延された管の寸法;D 134.5×iD 56.7×l 10000 上記圧延により得られた鋼管の偏肉率は６％、表面粗さ
は40Hmaxであり、高品質の極厚肉鋼管を得ることができ
た。Billet size; D 173 × l 5000 Billet material; Low alloy steel Product size; D 134.5 × iD 56.7 × l 9800 Perforating / rolling process equipment; Mannesmann type piercer roll opening 91% Perforated and rolled pipe size; D 173 × iD 97 × l 7250 Drawing and rolling process equipment; Plug mill (but without using plug) Outer diameter reduction in the first pass 8.7% Outer diameter reduction in the second pass 1.3% Dimensions of drawn and rolled tube; D 156 × iD 79 × l 8220 Forming and rolling process equipment; Sizer + drawing outer diameter reduction rate 14% Dimension of formed and rolled pipe; D 134.5 × iD 56.7 × l 10000 The thickness deviation of the steel pipe obtained by the above rolling is 6%, The surface roughness was 40H max , and it was possible to obtain a high quality extremely thick steel pipe.
（発明の効果） 本発明によれば、従来のマンネスマン穿孔方式では製造
することができなかった長尺厚肉の、かつ表面性状の良
好な継目無鋼管を製造することができる。(Effects of the Invention) According to the present invention, it is possible to manufacture a long and thick seamless steel pipe having a good surface quality, which could not be manufactured by the conventional Mannesmann drilling method.
また、既設のマンネスマン方式の継目無鋼管製造設備を
そのまま使用することができる。したがって、継目無鋼
管の製造範囲を飛躍的に拡大することができるととも
に、新たに設備を設置する必要はないので極めて容易に
本発明を実施することができる。Further, the existing Mannesmann method seamless steel pipe manufacturing equipment can be used as it is. Therefore, the manufacturing range of the seamless steel pipe can be dramatically expanded, and it is not necessary to newly install equipment, so that the present invention can be implemented very easily.
第１図はこの発明による継目無鋼管製造の工程図、第２
図はピアサー主要部の縦断面図、および第３図は従来の
マンネスマン方式による継目無鋼管製造の工程図であ
る。 １……ビレット、４……素管、５……穿孔ロール、７…
…プラグ、８……マンドレルバー。FIG. 1 is a process diagram of manufacturing a seamless steel pipe according to the present invention, and FIG.
The figure is a longitudinal sectional view of the main part of the piercer, and FIG. 3 is a process drawing of the conventional seamless steel pipe manufacturing by the Mannesmann method. 1 ... Billet, 4 ... Element tube, 5 ... Perforating roll, 7 ...
… Plug, 8 …… Mandrel bar.
Claims (2)
の製造において、マンネスマン式ピアサーによりビレッ
トを穿孔して素管とし、半円形孔型をもつロール対によ
り、かつ圧下方向を90度変えて少なくとも２パスで、１
パス当り５％以上の外径圧下率により前記素管を延伸圧
延し、延伸圧延した素管をサイザー、レデューサーまた
はストレッチレデューサーにより成形圧延することを特
徴とする継目無鋼管の製造方法。1. In the production of a seamless steel pipe having a wall thickness / outer diameter of 0.2 or more, a billet is punched by a Mannesmann type piercer to form a raw pipe, and a roll pair having a semicircular hole shape is used, and a rolling direction is applied. 90 degree change, at least 2 passes, 1
A method for producing a seamless steel pipe, characterized in that the raw pipe is stretch-rolled at an outer diameter reduction of 5% or more per pass, and the stretch-rolled raw pipe is shape-rolled by a sizer, reducer or stretch reducer.
量を91〜96％に設定して穿孔することを特徴とする特許
請求の範囲第１項記載の継目無鋼管の製造方法。2. The method for manufacturing a seamless steel pipe according to claim 1, wherein the Mannesmann piercer is perforated with a roll opening amount set to 91 to 96%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29666886A JPH0734927B2 (en) | 1986-12-15 | 1986-12-15 | Method for manufacturing seamless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29666886A JPH0734927B2 (en) | 1986-12-15 | 1986-12-15 | Method for manufacturing seamless steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63149004A JPS63149004A (en) | 1988-06-21 |
| JPH0734927B2 true JPH0734927B2 (en) | 1995-04-19 |
Family
ID=17836530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29666886A Expired - Lifetime JPH0734927B2 (en) | 1986-12-15 | 1986-12-15 | Method for manufacturing seamless steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0734927B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9426985B2 (en) | 2012-12-31 | 2016-08-30 | Dow Agrosciences Llc | Compositions and methods to modulate the rate of EBIS production from dithiocarbamate fungicides |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4213276C2 (en) * | 1992-04-16 | 1996-05-23 | Mannesmann Ag | Process for producing seamless pipes using the plug rolling process |
| JP4407844B2 (en) * | 2008-03-25 | 2010-02-03 | 住友金属工業株式会社 | Seamless pipe manufacturing method and seamless pipe manufacturing billet length determination method |
-
1986
- 1986-12-15 JP JP29666886A patent/JPH0734927B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9426985B2 (en) | 2012-12-31 | 2016-08-30 | Dow Agrosciences Llc | Compositions and methods to modulate the rate of EBIS production from dithiocarbamate fungicides |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63149004A (en) | 1988-06-21 |
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