JP2002273505A - Method for manufacturing seamless steel tube - Google Patents
Method for manufacturing seamless steel tubeInfo
- Publication number
- JP2002273505A JP2002273505A JP2001078075A JP2001078075A JP2002273505A JP 2002273505 A JP2002273505 A JP 2002273505A JP 2001078075 A JP2001078075 A JP 2001078075A JP 2001078075 A JP2001078075 A JP 2001078075A JP 2002273505 A JP2002273505 A JP 2002273505A
- Authority
- JP
- Japan
- Prior art keywords
- plug
- scale
- seamless steel
- outer layer
- steel pipe
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、継目無鋼管の製造
方法、詳しくは、傾斜ロールを用いた穿孔機による熱間
継目無鋼管の穿孔圧延方法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 of manufacturing a seamless steel pipe, and more particularly to a method of piercing and rolling a hot seamless steel pipe by a punch using an inclined roll.
【０００２】[0002]
【従来の技術】継目無鋼管は、マンネスマン方式の場
合、中実の丸ビレット鋼片を穿孔圧延して中空素管とな
し、この中空素管を所定寸法に延伸圧延することにより
製造される。2. Description of the Related Art In the case of the Mannesmann system, a seamless steel pipe is manufactured by piercing and rolling a solid round billet steel slab to form a hollow shell, and elongating and rolling the hollow shell to a predetermined size.
【０００３】例えば、前記中実丸ビレット鋼片の穿孔圧
延工程では、パスラインの周りに配設された複数の傾斜
ロールの間に被加工材としての中実丸ビレットを噛み込
ませてこの中実丸ビレットをその軸心線方向に移動させ
ると共に、この移動中の中実丸ビレットに対し、その軸
心線方向に沿ってプラグを貫入させることで、前記中実
丸ビレットを穿孔して中空素管となしている。For example, in the piercing and rolling step of the solid round billet billet, a solid round billet as a workpiece is bitten between a plurality of inclined rolls disposed around a pass line. The solid round billet is pierced by moving the solid round billet in the axial direction thereof, and by inserting a plug into the moving solid round billet along the axial direction, thereby piercing the solid round billet. It is a base tube.
【０００４】また、延伸圧延工程では、前記中空素管に
対し、その軸心線方向に沿ってプラグ若しくはマンドレ
ルバー等の内面拘束工具を貫入させて延伸圧延し、所望
の外径、肉厚を有する継目無鋼管を製造する。[0004] In the elongation rolling step, an inner surface restraining tool such as a plug or a mandrel bar is penetrated into the hollow shell along the axial direction thereof and elongation rolling is performed to obtain a desired outer diameter and wall thickness. To manufacture seamless steel pipes.
【０００５】ところで、前記傾斜ロールを用いた穿孔圧
延工程においては、プラグは加熱されたビレット及び中
空素管との絶え間ない接触によって、常時、高温・高負
荷にさらされ、摩耗、溶損しやすい状態となっている。
従って、一般にプラグには９００〜１１００℃の高温で
スケール処理を施し、プラグ表面に数１００μｍのスケ
ール被膜を形成させて、損耗防止を図っている。In the piercing and rolling process using the inclined rolls, the plug is constantly exposed to a high temperature and a high load due to constant contact with the heated billet and the hollow shell, and is liable to wear and melt. It has become.
Therefore, the plug is generally subjected to a scale treatment at a high temperature of 900 to 1100 ° C., and a scale coating of several hundred μm is formed on the plug surface to prevent wear.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、損耗防
止のためにプラグ表面に数１００μｍのスケール被膜を
形成させた場合であっても、穿孔圧延過程において、プ
ラグ表面のスケールが溶融或いは剥離した場合には、ス
ケールの断熱効果が減少してプラグが溶損することにな
る。プラグが溶損すると、穿孔機で穿孔された母管の内
面に疵を転写してしまい、製品として不良となってしま
う。However, even if a scale coating of several hundred μm is formed on the plug surface for the purpose of preventing wear, even if the scale on the plug surface melts or separates in the piercing and rolling process. In this case, the heat insulating effect of the scale is reduced and the plug is eroded. If the plug is melted, flaws are transferred to the inner surface of the mother pipe drilled by the drilling machine, resulting in a defective product.
【０００７】なお、特開平５−１３８２１３号や特開平
８−１９７１１３号等にプラグに黒鉛系や水ガラス系の
潤滑剤を塗布する方法が開示されているが、これらの方
法は何れもプラグ寿命の向上を目的としており、本発明
とは目的が異なるのみならず、内面疵の発生を防止する
のに十分な性能を有していない。JP-A-5-138213 and JP-A-8-197113 disclose a method of applying a graphite-based or water-glass-based lubricant to a plug. The purpose of the present invention is not only different from that of the present invention, but also does not have sufficient performance to prevent the occurrence of internal flaws.
【０００８】本発明は、上記した従来の問題点に鑑みて
なされたものであり、傾斜ロールを用いた穿孔機での穿
孔圧延において、内面品質の良好な継目無鋼管を製造す
る方法を提供することを目的としている。The present invention has been made in view of the above-mentioned conventional problems, and provides a method for producing a seamless steel pipe having good inner surface quality in piercing and rolling by a piercing machine using an inclined roll. It is intended to be.
【０００９】[0009]
【課題を解決するための手段】上記した目的を達成する
ために、本発明に係る継目無鋼管の製造方法は、表面に
形成させたスケール被膜構造の内で、プラグの地金表面
外方に形成されるＦｅ 2 Ｏ3 、Ｆｅ3 Ｏ4 層を主体とす
る外層スケールを生成させないプラグ、或いは、Ｆｅ2
Ｏ3 、Ｆｅ3 Ｏ4 層を主体とする外層スケールを除去し
たプラグを使用して穿孔圧延することとしている。そし
て、このようにすることで、内面品質の良好な継目無鋼
管を製造できるようになる。Means for Solving the Problems To achieve the above object
Therefore, the method for manufacturing a seamless steel pipe according to the present invention
In the formed scale coating structure, the plug metal surface
Fe formed outward Two OThree , FeThree OFour Layer-based
Or a plug that does not generate an outer layer scaleTwo
OThree , FeThree OFour Remove the outer layer scale mainly composed of layers
The piercing and rolling are performed using the plug. Soshi
In this way, seamless steel with good inner surface quality
Be able to manufacture tubes.
【００１０】[0010]
【発明の実施の形態】本発明者は上記した目的を達成す
べく、鋭意研究した結果、以下のような知見を得た。 継目無鋼管の製造において内面疵が発生するのは、
プラグの熱処理後１パス目に集中しており、２パス目以
降は激減すること。BEST MODE FOR CARRYING OUT THE INVENTION The inventor of the present invention has conducted intensive studies in order to achieve the above object, and has obtained the following findings. Internal flaws occur in the production of seamless steel pipes,
After the heat treatment of the plug, it is concentrated on the first pass, and it will decrease drastically after the second pass.
【００１１】 熱処理後１パス目のプラグを使用した
場合と、２パス目以降のプラグを使用した場合を比較す
ると、１パス目のプラグを使用した場合の方が穿孔速度
が遅いすなわち穿孔効率が悪いこと。A comparison between the case of using the plug of the first pass after the heat treatment and the case of using the plug of the second and subsequent passes shows that the use of the plug of the first pass has a lower drilling speed, ie, the drilling efficiency is lower. Bad thing.
【００１２】 プラグ表面のスケール構造は、大別す
るとＦｅ2 Ｏ3 、Ｆｅ3 Ｏ4 からなるポーラスな構造を
有する外層、ＦｅＯからなる緻密な構造を有する層、プ
ラグ母材とＦｅ−Ｃｒ系（母材材質によりＦｅ−Ｎｉ
系、Ｆｅ−Ｗ系も存在する）酸化物とが入り混じったス
ピネル層の３層構造であり、このスケール構造の内で、
外層のＦｅ2 Ｏ3 、Ｆｅ3 Ｏ4 からなるポーラスな層を
除去すると、１パス目でも内面疵の発生が減少し、穿孔
効率もスケールを除去しない場合と比べて良くなるこ
と。The scale structure of the plug surface can be roughly classified into an outer layer having a porous structure made of Fe 2 O 3 and Fe 3 O 4 , a layer having a dense structure made of FeO, a plug base material and an Fe—Cr type ( Fe-Ni depending on base material
System, and Fe-W system), which is a three-layer structure of a spinel layer mixed with an oxide.
When the porous layer made of Fe 2 O 3 and Fe 3 O 4 as the outer layer is removed, the occurrence of inner surface flaws is reduced even in the first pass, and the perforation efficiency is improved as compared with the case where the scale is not removed.
【００１３】 通常、マンネスマン製管でのビレット
加熱温度は１１００〜１３００℃であるため、少なくと
も穿孔初期には、融点が１３００℃を超えるＦｅ2 Ｏ
3 、Ｆｅ 3 Ｏ4 の層は溶融しない。従って、プラグから
脱落したものについてはプラグと被穿孔材の間に入り込
み、被穿孔材の内面に疵をつけると推測できる。また、
脱落せずにプラグに密着しているＦｅ2 Ｏ3 、Ｆｅ3 Ｏ
4 の層については被穿孔材の内面で抵抗となり、穿孔効
率を悪くさせる原因になると共に、被穿孔材の内面に疵
をつけると推測できること。Usually, billets in Mannesmann pipes
Since the heating temperature is 1100-1300 ° C, at least
In the early stage of drilling, the melting point exceeds 1300 ° C.Two O
Three , Fe Three OFour Layers do not melt. Therefore, from the plug
If it falls off, it will enter between the plug and the material to be pierced.
Therefore, it can be estimated that the inner surface of the material to be perforated is flawed. Also,
Fe adhered to the plug without falling offTwo OThree , FeThree O
Four For the layer of
This may cause the rate to worsen, and the inner surface of
Can be guessed to be attached.
【００１４】本発明に係る継目無鋼管の製造方法は、上
記した知見に基づいてなされたものであり、表面にスケ
ール被膜を形成させたプラグを用いてビレットを穿孔
し、継目無鋼管を製造する方法において、前記スケール
被膜構造の内で、プラグの地金表面外方に形成されるＦ
ｅ2 Ｏ3 、Ｆｅ3 Ｏ4 層を主体とする外層スケールを生
成させないプラグ、或いは、Ｆｅ2 Ｏ3 、Ｆｅ3 Ｏ4 層
を主体とする外層スケールを除去したプラグを使用する
ものである。The method for manufacturing a seamless steel pipe according to the present invention is based on the above-mentioned findings, and a billet is pierced using a plug having a scale coating formed on the surface to manufacture a seamless steel pipe. In the method, F formed outside the metal surface of the plug within the scale coating structure
A plug that does not generate an outer layer scale mainly composed of an e 2 O 3 or Fe 3 O 4 layer or a plug that is formed by removing an outer layer scale mainly composed of an Fe 2 O 3 or Fe 3 O 4 layer is used.
【００１５】本発明に係る継目無鋼管の製造方法では、
プラグ表面スケールの少なくともＦｅ2 Ｏ3 、Ｆｅ3 Ｏ
4 を主体とする外層を生成させない、或いは、除去した
プラグを使用するので、穿孔途中にＦｅ2 Ｏ3 、Ｆｅ3
Ｏ4 を主体とする外層が脱落することがなくなる。従っ
て、脱落したスケールが穿孔機で穿孔された母管の内面
に穿孔中に押し込まれることにより発生する内面疵や、
プラグ表面粗度が粗いことにより前記穿孔機で穿孔され
た母管の内面にプラグより転写される内面疵や、少なく
とも穿孔初期に溶融せずに被圧延材に対する抵抗とな
り、穿孔効率が悪くなってしまうことによるビレット中
心でのマンネスマン破壊を抑制できるようになる。In the method for manufacturing a seamless steel pipe according to the present invention,
At least Fe 2 O 3 , Fe 3 O on the plug surface scale
Since the outer layer mainly composed of No. 4 is not generated or the plug which has been removed is used, Fe 2 O 3 , Fe 3
The outer layer mainly composed of O 4 does not fall off. Therefore, the inner surface flaws caused by the fallen scale being pushed into the inner surface of the mother pipe drilled by the drilling machine during drilling,
Internal surface flaws transferred from the plug to the inner surface of the mother pipe drilled by the drilling machine due to the rough surface roughness of the plug, and resistance to the material to be rolled without melting at least at the initial stage of drilling, resulting in poor drilling efficiency. It is possible to suppress the destruction of the Mannesmann at the center of the billet due to this.
【００１６】本発明に係る継目無鋼管の製造方法におい
て、Ｆｅ2 Ｏ3 、Ｆｅ3 Ｏ4 を主体とする外層スケール
を生成させない方法としては、例えばプラグ熱処理条
件、熱処理雰囲気の調整、或いは、プラグ熱処理前にプ
ラグ表面に酸化防止剤等を塗布してＦｅ2 Ｏ3 、Ｆｅ3
Ｏ4 からなる層をもともと発生させない方法等がある。In the method for manufacturing a seamless steel pipe according to the present invention, as a method for preventing the formation of the outer layer scale mainly composed of Fe 2 O 3 and Fe 3 O 4 , for example, adjusting the plug heat treatment conditions, adjusting the heat treatment atmosphere, or Before heat treatment, an antioxidant or the like is applied to the plug surface so that Fe 2 O 3 , Fe 3
There is a method of not generating a layer composed of O 4 originally.
【００１７】また、本発明に係る継目無鋼管の製造方法
において、前記外層スケールを除去する方法としては、
ベルター、ハンマーやショットによる機械的な方法、酸
を使用して除去したい層を溶融させる化学的な方法等が
ある。Further, in the method for manufacturing a seamless steel pipe according to the present invention, the method for removing the outer layer scale includes the following.
There are a mechanical method using a belter, a hammer and a shot, and a chemical method using an acid to melt a layer to be removed.
【００１８】上記した何れの方法を採用してもかまわな
いが、Ｆｅ2 Ｏ3 、Ｆｅ3 Ｏ4 からなるポーラスな層を
除去した後のプラグ表面は滑らかであることが好ましい
ことは言うまでもない。従って、外層スケールを除去し
た後等に研磨を施してもよい。Although any of the above methods may be adopted, it is needless to say that the plug surface after removing the porous layer made of Fe 2 O 3 and Fe 3 O 4 is preferably smooth. Therefore, polishing may be performed after the outer layer scale is removed.
【００１９】上記した本発明に係る継目無鋼管の製造方
法のうち、Ｆｅ2 Ｏ3 、Ｆｅ3 Ｏ4層を主体とする外層
スケールを除去したプラグを使用する場合において、プ
ラグ表面を急速に加熱することにより熱衝撃を加えて外
層スケールを除去したプラグを使用すると、可及的にプ
ラグ母材表面に疵をつけることなく、外層スケールの除
去が容易にしかも短時間で行えるようになる。In the method of manufacturing a seamless steel pipe according to the present invention, when a plug whose outer layer scale mainly composed of Fe 2 O 3 and Fe 3 O 4 layers is removed is used, the plug surface is rapidly heated. By using a plug from which the outer layer scale has been removed by applying a thermal shock, the outer layer scale can be removed easily and in a short time without flawing the surface of the plug base material as much as possible.
【００２０】[0020]
【実施例】以下、本発明に係る継目無鋼管の製造方法の
効果を確認するために行った実施例について説明する。
実験に使用した下記表１に示すプラグは、０．１５％Ｃ
−０．５％Ｃｒ−１．０％Ｎｉ−３．０％Ｗ−１．５％
Ｍｏ系のプラグを使用した。実験にはプラグ母材とＦｅ
−Ｃｒ系（母材材質によりＦｅ−Ｎｉ系、Ｆｅ−Ｗ系も
存在する）酸化物とが入り混じったスピネル層が５０〜
２５０μｍのものを使用した。この場合、スピネル層の
厚みは熱処理条件によって変化させた。なお、このスピ
ネル層の厚みは、プラグ寿命の観点から２０μｍ以上で
あることが望ましい。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of embodiments performed to confirm the effects of the method for manufacturing a seamless steel pipe according to the present invention.
The plug shown in Table 1 below used in the experiment was 0.15% C
-0.5% Cr-1.0% Ni-3.0% W-1.5%
A Mo-based plug was used. In the experiment, the plug base metal and Fe
A spinel layer mixed with a Cr-based oxide (Fe-Ni-based or Fe-W-based depending on the material of the base material);
The thing of 250 micrometers was used. In this case, the thickness of the spinel layer was changed according to the heat treatment conditions. Note that the thickness of the spinel layer is desirably 20 μm or more from the viewpoint of plug life.
【００２１】また、プラグ表面のＦｅ2 Ｏ3 、Ｆｅ3 Ｏ
4 からなるポーラスな構造を有する層を除去する際は、
実験ではプラグを熱処理した後、プラグ表面をバーナに
よって急速加熱する方法を採用した。Further, Fe 2 O 3 , Fe 3 O
Removing the layer having a porous structure consisting of 4,
In the experiment, a method was used in which the plug surface was rapidly heated by a burner after heat treatment of the plug.
【００２２】圧延試験では、外径が１８７ｍｍ、長さが
９２０ｍｍの、１２３０℃に加熱されたＳＵＳ３０４相
当鋼（１８％Ｃｒ−８％Ｎｉ鋼）の丸ビレットを、穿孔
機にて外径が１９２ｍｍ、肉厚が１２．１９ｍｍ、長さ
が３５２０ｍｍに穿孔圧延し、続いてマンドレルミルに
て外径が１１０ｍｍ、肉厚が３．５０ｍｍ、長さが２１
１８０ｍｍに延伸圧延し、最後にストレッチレデューサ
ミルにて外径が３４．０ｍｍ、長さが８３６５７ｍｍに
定径圧延し、長手方向に３分割した。そして、各々各１
５本の製品内面を検査し、内面疵の発生本数を調査し
た。その結果を下記表１に示す。In the rolling test, a round billet of SUS304 equivalent steel (18% Cr-8% Ni steel) having an outer diameter of 187 mm and a length of 920 mm and heated to 1230 ° C. was pierced with a 192 mm outer diameter. And piercing-rolling to a thickness of 12.19 mm and a length of 3520 mm, followed by a mandrel mill having an outer diameter of 110 mm, a thickness of 3.50 mm, and a length of 21.
It was stretched and rolled to 180 mm, and finally rolled to a constant diameter of 34.0 mm and a length of 83657 mm by a stretch reducer mill, and divided into three in the longitudinal direction. And each one
The inner surfaces of five products were inspected, and the number of occurrences of inner surface flaws was investigated. The results are shown in Table 1 below.
【００２３】[0023]
【表１】 [Table 1]
【００２４】表１に示すように、プラグ表面スケールの
外層スケールを除去した実施例Ｎｏ．１〜３は、何れの
場合にも、１パス目から内面疵の発生率は少なく、良好
な結果を示した。一方、熱処理したままでプラグ表面ス
ケールの外層スケールを除去しない比較例Ｎｏ．１１〜
１３の場合には、何れの場合も特に１パス目の内面疵の
発生本数が多く、製品としての歩留りが悪かった。As shown in Table 1, in Example No. 1 in which the outer layer scale of the plug surface scale was removed. In each of the samples Nos. 1 to 3, the rate of occurrence of inner surface flaws was small from the first pass and good results were shown. On the other hand, in Comparative Example No. in which the outer layer scale of the plug surface scale was not removed while the heat treatment was performed. 11-
In the case of No. 13, the number of occurrences of inner surface flaws in the first pass was particularly large in each case, and the yield as a product was poor.
【００２５】[0025]
【発明の効果】以上説明したように、本発明によれば、
プラグ表面スケールの少なくともＦｅ 2 Ｏ3 、Ｆｅ3 Ｏ
4 を主体とする外層を生成させない、或いは、除去した
プラグを使用するので、穿孔途中にＦｅ2 Ｏ3 、Ｆｅ3
Ｏ4 を主体とする外層が脱落することがなくなり、内面
疵やビレット中心でのマンネスマン破壊を効果的に抑制
することができる。As described above, according to the present invention,
At least Fe on the plug surface scale Two OThree , FeThree O
Four Did not produce or removed the outer layer mainly composed of
Since a plug is used, FeTwo OThree , FeThree
OFour The outer layer mainly consisting of
Effectively suppresses Mannesmann fracture at the center of flaws and billets
can do.
Claims (3)
を用いてビレットを穿孔し、継目無鋼管を製造する方法
において、前記スケール被膜構造の内で、プラグの地金
表面外方に形成されるＦｅ2 Ｏ3 、Ｆｅ3 Ｏ4 層を主体
とする外層スケールを生成させないプラグを使用するこ
とを特徴とする継目無鋼管の製造方法。1. A method of manufacturing a seamless steel pipe by piercing a billet using a plug having a scale coating formed on a surface thereof, wherein the scale coating structure is formed outside a metal surface of a plug in the scale coating structure. A method for producing a seamless steel pipe, characterized by using a plug mainly composed of Fe 2 O 3 and Fe 3 O 4 and not generating an outer layer scale.
を用いてビレットを穿孔し、継目無鋼管を製造する方法
において、前記スケール被膜構造の内で、プラグの地金
表面外方に形成されるＦｅ2 Ｏ3 、Ｆｅ3 Ｏ4 層を主体
とする外層スケールを除去したプラグを使用することを
特徴とする継目無鋼管の製造方法。2. A method of manufacturing a seamless steel pipe by piercing a billet using a plug having a scale coating formed on a surface thereof, wherein the scale coating is formed on a surface of the plug metal outside of the plug in the scale coating structure. Fe 2 O 3, Fe 3 seamless steel pipe production method, which comprises O 4 layer using a plug to remove the outer layer scale composed mainly of.
加熱することにより熱衝撃を加えて外層スケールを除去
したものであることを特徴とする請求項２記載の継目無
鋼管の製造方法。3. The method for producing a seamless steel pipe according to claim 2, wherein the plug used is one in which the outer surface scale is removed by applying thermal shock by rapidly heating the plug surface.
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| JP2001078075A JP3777997B2 (en) | 2001-03-19 | 2001-03-19 | Seamless steel pipe manufacturing method |
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| JP2001078075A JP3777997B2 (en) | 2001-03-19 | 2001-03-19 | Seamless steel pipe manufacturing method |
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| JP2002273505A true JP2002273505A (en) | 2002-09-25 |
| JP3777997B2 JP3777997B2 (en) | 2006-05-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004052569A1 (en) * | 2002-12-12 | 2004-06-24 | Sumitomo Metal Industries, Ltd. | Seamless metal tube producing method |
| WO2008096708A1 (en) * | 2007-02-05 | 2008-08-14 | Sumitomo Metal Industries, Ltd. | Process for producing plug for use in piercing/rolling raw metallic material, process for producing metallic tube, and plug for use in piercing/rolling raw metallic material |
| JP2016182622A (en) * | 2015-03-26 | 2016-10-20 | Ｊｆｅスチール株式会社 | Method and apparatus for removing excess scale on plug for piercing seamless steel tube material and method of using the plug |
-
2001
- 2001-03-19 JP JP2001078075A patent/JP3777997B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004052569A1 (en) * | 2002-12-12 | 2004-06-24 | Sumitomo Metal Industries, Ltd. | Seamless metal tube producing method |
| US6988387B2 (en) | 2002-12-12 | 2006-01-24 | Sumitomo Metal Industries, Ltd. | Making method for seamless metallic tube |
| CN100404151C (en) * | 2002-12-12 | 2008-07-23 | 住友金属工业株式会社 | Seamless metal tube producing method |
| WO2008096708A1 (en) * | 2007-02-05 | 2008-08-14 | Sumitomo Metal Industries, Ltd. | Process for producing plug for use in piercing/rolling raw metallic material, process for producing metallic tube, and plug for use in piercing/rolling raw metallic material |
| EP2111933A1 (en) * | 2007-02-05 | 2009-10-28 | Sumitomo Metal Industries Limited | Process for producing plug for use in piercing/rolling raw metallic material, process for producing metallic tube, and plug for use in piercing/rolling raw metallic material |
| US8065900B2 (en) | 2007-02-05 | 2011-11-29 | Sumitomo Metal Industries, Ltd. | Method of manufacturing plug used to pierce and roll metal material, method of manufacturing metal pipe and plug used to pierce and roll metal material |
| JP5131702B2 (en) * | 2007-02-05 | 2013-01-30 | 新日鐵住金株式会社 | Manufacturing method of plug used for piercing and rolling of metal material, manufacturing method of metal tube, and plug used for piercing and rolling of metal material |
| EP2111933A4 (en) * | 2007-02-05 | 2013-04-10 | Nippon Steel & Sumitomo Metal Corp | Process for producing plug for use in piercing/rolling raw metallic material, process for producing metallic tube, and plug for use in piercing/rolling raw metallic material |
| EP2111933B1 (en) | 2007-02-05 | 2015-04-08 | Nippon Steel & Sumitomo Metal Corporation | Process for producing plug for use in piercing/rolling raw metallic material, process for producing metallic tube, and plug for use in piercing/rolling raw metallic material |
| JP2016182622A (en) * | 2015-03-26 | 2016-10-20 | Ｊｆｅスチール株式会社 | Method and apparatus for removing excess scale on plug for piercing seamless steel tube material and method of using the plug |
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| JP3777997B2 (en) | 2006-05-24 |
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