JPH08225887A - Plug for producing seamless pipe - Google Patents
Plug for producing seamless pipeInfo
- Publication number
- JPH08225887A JPH08225887A JP3046495A JP3046495A JPH08225887A JP H08225887 A JPH08225887 A JP H08225887A JP 3046495 A JP3046495 A JP 3046495A JP 3046495 A JP3046495 A JP 3046495A JP H08225887 A JPH08225887 A JP H08225887A
- Authority
- JP
- Japan
- Prior art keywords
- plug
- scale
- seamless pipe
- rolling
- oxide
- 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
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- Heat Treatment Of Steel (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、継目無管製造用プラグ
に関する。FIELD OF THE INVENTION The present invention relates to a plug for producing a seamless pipe.
【０００２】[0002]
【従来の技術】継目無管の製造法の代表的なものとして
マンネスマン方式があるが、その穿孔圧延に用いられる
プラグには、 3％Cr-1％Niベースのものが一般に用いら
れている。しかし、13％以上のCrを含有するステンレス
鋼、Ni基合金や高合金鋼等の継目無管をマンネスマン方
式で製管する場合には、穿孔温度の上昇や被圧延材とプ
ラグの面圧の上昇が起こり、プラグの寿命が著しく短く
なる。例えば、従来の 3％Cr-1％Niをベースとしたプラ
グを用いてSUS420J1（ 0.2％Ｃ−13％Cr）材を圧延した
場合には、高々３パス程度、SUS304（19％Cr-9％Ni）材
では１パスでプラグに変形が生じて、プラグを頻繁に交
換して製造せざるを得ず生産性の低下を招いていた。2. Description of the Related Art The Mannesmann method is a typical method for producing a seamless pipe, and a plug used for piercing and rolling is generally based on 3% Cr-1% Ni. However, when producing seamless pipes such as stainless steel containing 13% or more of Cr, Ni-based alloys, and high alloy steels by the Mannesmann method, it is necessary to increase the piercing temperature and increase the surface pressure of the rolled material and plug. As a result, the life of the plug is shortened significantly. For example, when rolling a SUS420J1 (0.2% C-13% Cr) material using a conventional 3% Cr-1% Ni-based plug, it takes about 3 passes at most and SUS304 (19% Cr-9% Cr). For Ni) material, the plug was deformed in one pass, and the plug had to be replaced frequently, and the productivity was reduced.
【０００３】そこで、特開平4-147706号公報には、プラ
グの形状を変更すると共に、Moを0.50〜5.00％、Ｗを0.
50〜5.00％およびNbを0.10〜5.00％含有した鍛造合金の
表面に酸化スケール皮膜を形成することで、高温強度と
スケールの密着性を高めてプラグ寿命を改善する技術が
開示されている。さらに、特開平4 −26739 号公報に
は、Ｃを0.65〜 1.0％、Siを 0.1〜 2.0％、Niを 0.5〜
7.0％およびMoとＷの１種以上を合計量で 1.5〜 8.0％
含有した工具鋼の表面に50〜 250μｍの酸化スケール潤
滑皮膜を形成させることで、ステンレス鋼やNi基合金等
の変形抵抗の高い材料の熱間製管に適したプラグが提案
されている。Therefore, in Japanese Patent Laid-Open No. 4-147706, the shape of the plug is changed, and Mo is 0.50 to 5.00% and W is 0.5%.
A technique for improving the plug life by forming an oxide scale film on the surface of a forged alloy containing 50 to 5.00% and 0.10 to 5.00% Nb to improve high temperature strength and scale adhesion is disclosed. Further, in JP-A-4-26739, C is 0.65 to 1.0%, Si is 0.1 to 2.0%, and Ni is 0.5 to 0.5%.
7.0% and one or more of Mo and W in the total amount of 1.5 to 8.0%
A plug suitable for hot pipe production of materials with high deformation resistance such as stainless steel and Ni-based alloys has been proposed by forming an oxide scale lubricating film of 50 to 250 μm on the surface of the contained tool steel.
【０００４】しかし、上記プラグを用いた穿孔圧延で
も、特にCrを13％以上含有するステンレス鋼やNi基合金
を圧延した場合、最も面圧が高く温度が上昇するプラグ
先端部では表面のスケールが溶融してしまい、酸化スケ
ール膜による断熱効果や潤滑効果が消失し、プラグ先端
が溶損するという問題があった。また、Ｃ量が高いと低
靱性となり、穿孔圧延時のプラグの割れ発生や圧延後の
水冷でプラグに焼き割れが発生する可能性もある。However, even when piercing and rolling using the above-mentioned plug, especially when stainless steel or Ni-based alloy containing 13% or more of Cr is rolled, the surface scale becomes large at the tip of the plug where the surface pressure is highest and the temperature rises. There is a problem in that the plug is melted, the heat insulating effect and the lubricating effect of the oxide scale film disappear, and the plug tip is melted. Further, if the C content is high, the toughness becomes low, and there is a possibility that cracks may occur in the plug during piercing and rolling or quench cracking may occur in the plug due to water cooling after rolling.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、13％
以上のCrを含有する高Crステンレス鋼、Ni基合金や高合
金鋼等の変形抵抗が高く、焼付等が発生し易い材料の穿
孔圧延においても、焼付や割れおよび変形等が生じな
い、優れた耐久性を有する継目無管製造用プラグを提供
することにある。The object of the present invention is 13%.
High-Cr stainless steel containing the above Cr, Ni-based alloy and high alloy steel, etc. have high deformation resistance and do not cause seizure, cracking or deformation even in piercing and rolling of materials that are prone to seizure, etc. An object of the present invention is to provide a plug for producing a seamless pipe having durability.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、高Crステ
ンレス鋼、Ni基合金や高合金鋼等の変形抵抗の高い材料
を穿孔圧延した時の熱履歴とプラグ表面に形成される酸
化スケールに着目し、プラグの組成による機械的性質と
酸化スケールの形成挙動と合わせて検討し、下記の知見
を得た。[Means for Solving the Problems] The inventors of the present invention have found that the thermal history and the oxidation formed on the plug surface when piercing-rolling a material having high deformation resistance such as high Cr stainless steel, Ni-base alloy or high alloy steel. Focusing on the scale, the mechanical properties due to the composition of the plug and the formation behavior of the oxide scale were examined, and the following findings were obtained.
【０００７】Cr含有量が13％以上の高Crステンレス鋼
などの変形抵抗の高い材料を穿孔圧延する際、圧延中の
プラグ先端部の温度は1150℃以上になる。しかし、高温
強度確保のためにＷを含有させたり、表面酸化スケール
の密着性改善のためにSiを含有させたプラグでは、表面
に形成される酸化スケールの融点は1100℃程度と低いた
め、穿孔圧延中にスケールが完全に溶融し、スケールに
よる断熱効果が消失しプラグ先端の溶損が発生する。さ
らに、スケールによる潤滑効果がなくなるため焼付も発
生する。When piercing-rolling a material having high deformation resistance such as high Cr stainless steel having a Cr content of 13% or more, the temperature of the plug tip portion during rolling is 1150 ° C. or more. However, in the case of a plug containing W for securing high temperature strength or Si for improving adhesion of the surface oxide scale, the melting point of the oxide scale formed on the surface is as low as about 1100 ° C, so During rolling, the scale melts completely, the heat insulating effect of the scale disappears, and the plug tip melts. Further, since the lubricating effect of the scale disappears, seizure also occurs.
【０００８】これは、プラグ表面に形成されるスケール
中のＷ酸化物とFe酸化物が1100℃付近で共晶反応を起こ
すこと、および融点が1100℃付近のFe−Si複合酸化物が
形成されるためである。This is because W oxide and Fe oxide in the scale formed on the surface of the plug cause a eutectic reaction at around 1100 ° C., and a Fe--Si composite oxide having a melting point near 1100 ° C. is formed. This is because
【０００９】したがって、プラグの組成のＷ量やSi量を
規制し、プラグ表面の酸化スケール皮膜中のＷ酸化物や
Fe−Si複合酸化物の生成を抑制することでスケールの融
点を上昇させ、スケールの融点を穿孔圧延温度以上とす
ることにより、断熱効果を保持し潤滑効果を得ることが
できるため、変形抵抗の大きい材料の穿孔圧延中のプラ
グ先端の溶損や焼付を防止することができる。Therefore, the W amount and the Si amount of the composition of the plug are regulated, and the W oxide and the oxide in the oxide scale film on the plug surface are controlled.
By increasing the melting point of the scale by suppressing the formation of Fe-Si composite oxide, and by setting the melting point of the scale to the piercing rolling temperature or higher, it is possible to maintain the heat insulating effect and obtain the lubricating effect, so that the deformation resistance It is possible to prevent melting damage and seizure of the plug tip during piercing and rolling of a large material.
【００１０】一方、Cr含有量が13％以上の高Crステン
レス鋼やNi基合金等の材料を穿孔圧延する際のプラグの
高温変形抵抗を確保するにはＣ、Ｗ、Moの添加が効果的
である。しかし、上記の耐高温スケールの確保のための
Ｗの低減およびプラグの靱性や耐焼き割れ性の改善のた
めに低Ｃ量とした場合、高温変形抵抗の確保が困難とな
る。On the other hand, addition of C, W and Mo is effective for securing the high temperature deformation resistance of the plug when piercing and rolling a material such as high Cr stainless steel having a Cr content of 13% or more or Ni-based alloy. Is. However, if a low C content is used in order to reduce W to secure the high temperature resistance scale and to improve the toughness and the quench crack resistance of the plug, it becomes difficult to secure the high temperature deformation resistance.
【００１１】したがって、ＣおよびＷ量の低減による高
温変形抵抗の低下を補償するために、Mn、Moを所定量含
有させることが必要である。Therefore, in order to compensate for the reduction in the high temperature deformation resistance due to the reduction of the amounts of C and W, it is necessary to contain Mn and Mo in predetermined amounts.
【００１２】さらに、断熱および潤滑効果を得るため
にプラグ表面に所定厚さの酸化スケール皮膜を形成させ
るが、スケール生成を抑制するNi、Mo、Cr等の元素の含
有量を靱性や高温強度の確保と合わせて所定量に規制す
る必要がある。Further, an oxide scale film having a predetermined thickness is formed on the surface of the plug in order to obtain a heat insulation and lubrication effect, but the content of elements such as Ni, Mo, Cr, etc., which suppress scale formation, is adjusted to obtain toughness and high temperature strength. It is necessary to regulate it to a predetermined amount together with securing it.
【００１３】本発明は、上記知見に基づいてなされたも
のであって、重量％で、Ｃ：0.01〜0.5％、Si： 0〜 0.
5％、Mn： 0.2〜 3.0％、Ni： 0.5〜 7.0％、Ｗ： 0〜
0.5％未満、Mo： 0.5〜 8.0％、Cr： 0〜0.95％、Co：
0〜 5.0％を含有し、さらに、必要によりNb： 0.1〜 2.
0％、Ti：0.05〜 2.0％、およびZr：0.01〜 0.5％の内
の１種または２種以上を含むと共に、残部がFeおよび不
可避不純物からなる鍛造合金であって、その表面に50〜
500μｍの酸化スケール皮膜を有する継目無管製造用プ
ラグである。The present invention has been made on the basis of the above-mentioned findings, and in% by weight, C: 0.01 to 0.5%, Si: 0 to 0.
5%, Mn: 0.2 to 3.0%, Ni: 0.5 to 7.0%, W: 0 to
Less than 0.5%, Mo: 0.5 to 8.0%, Cr: 0 to 0.95%, Co:
0 to 5.0%, and if necessary Nb: 0.1 to 2.
A forged alloy containing 0%, Ti: 0.05 to 2.0%, and Zr: 0.01 to 0.5%, one or more of which is the balance of Fe and unavoidable impurities.
This is a plug for producing seamless pipes having a 500 μm oxide scale film.
【００１４】[0014]
（Ａ）プラグの成分 Ｃ：0.01〜 0.5％ Ｃは高温強度の向上に有効な成分であり、Ｃ含有量が0.
01％未満では十分な高温強度を確保することができな
い。一方、Ｃ含有量が多くなると、穿孔圧延後の高温か
らの冷却によりプラグ表面の硬度が高くなりすぎて靱性
が低下し、割れが発生する危険があるため上限を 0.5％
とした。(A) Plug component C: 0.01 to 0.5% C is a component effective for improving high temperature strength, and the C content is 0.
If it is less than 01%, sufficient high temperature strength cannot be secured. On the other hand, if the C content increases, the hardness of the plug surface becomes too high due to cooling from high temperature after piercing and rolling, the toughness decreases, and there is a risk of cracking, so the upper limit is 0.5%.
And
【００１５】Si： 0〜 0.5％ Siは脱酸およびプラグ表面のスケールの緻密化に有効な
成分であるが、Si含有量が 0.5％を超えると融点が1100
℃付近のFe−Siの複合酸化物を形成しプラグ表面の酸化
スケールの融点を低下させる。また、靱性も低下するた
め、Si含有量は0.5％以下とした。より好ましくは 0.1
％未満、さらには含有させずに不純物レベルである0.05
％以下とするのがよい。Si: 0 to 0.5% Si is an effective component for deoxidation and densification of the scale on the surface of the plug, but when the Si content exceeds 0.5%, the melting point is 1100.
It forms a Fe-Si composite oxide near ℃ and lowers the melting point of oxide scale on the plug surface. Further, since the toughness also decreases, the Si content is set to 0.5% or less. More preferably 0.1
%, The impurity level is 0.05 without further inclusion.
% Or less.
【００１６】Mn： 0.2〜 3.0％ Mnは高温強度の向上に有効な成分であり、 0.2％以上含
有させる必要がある。Mn: 0.2-3.0% Mn is a component effective in improving high temperature strength, and it is necessary to contain 0.2% or more.
【００１７】一方、Mn含有量が 3.0％を超えると穿孔圧
延中の熱疲労により割れが発生し易くなり、プラグ寿命
を低下させる。さらなる高温強度を確保するためには、
0.75％以上とするのが好ましい。On the other hand, if the Mn content exceeds 3.0%, cracks are likely to occur due to thermal fatigue during piercing and rolling, which shortens the plug life. To ensure further high temperature strength,
It is preferably 0.75% or more.
【００１８】Ni： 0.5〜 7.0％ Niはプラグ表面の焼き入れ層の靱性改善およびスケール
の耐剥離性向上に有効な成分であり、 0.5％以上の含有
でその効果が発揮される。しかし、Ni含有量が7.0％を
超えるとスケールの成長が抑制され、潤滑性が劣化す
る。したがい、Ni含有量は 0.5〜 7.0％とする。Ni: 0.5 to 7.0% Ni is an effective component for improving the toughness of the hardened layer on the surface of the plug and improving the peeling resistance of the scale, and its effect is exhibited when it is contained at 0.5% or more. However, when the Ni content exceeds 7.0%, the growth of scale is suppressed and the lubricity deteriorates. Therefore, the Ni content should be 0.5-7.0%.
【００１９】Ｗ： 0〜 0.5％未満 Ｗは高温強度の上昇に有効な成分である。しかし、プラ
グ表面に形成されるスケール中のＷ酸化物とFe酸化物が
1100℃付近で共晶反応を起こしスケールの融点が低下さ
せる。したがい、本発明ではＷ含有量は 0.5％未満と極
力少なくしており、Ｗを含有させない場合も本発明範囲
である。W: 0 to less than 0.5% W is an effective component for increasing the high temperature strength. However, the W oxide and Fe oxide in the scale formed on the plug surface
A eutectic reaction occurs at around 1100 ° C and the melting point of the scale decreases. Therefore, in the present invention, the W content is as low as less than 0.5%, and the case where W is not contained is within the scope of the present invention.
【００２０】Mo： 0.5〜 8.0％ Ｗ含有量を低減した本発明では、Moは高温強度を確保す
るために重要な元素であり、その含有量が 0.5％以上で
効果がある。一方、Mo含有量が 8.0％を超えるとスケー
ルの成長を抑制するため、プラグ寿命が低下する。ま
た、本発明鋼ではＣやＷ含有量を低減しているため、高
温強度を確保するためにMo含有量を 2.0％以上とするの
が好ましい。Mo: 0.5 to 8.0% In the present invention in which the W content is reduced, Mo is an important element for ensuring high temperature strength, and is effective when the content is 0.5% or more. On the other hand, when the Mo content exceeds 8.0%, the growth of the scale is suppressed, and the plug life is shortened. Further, since the C and W contents are reduced in the steel of the present invention, it is preferable that the Mo content is 2.0% or more in order to secure high temperature strength.
【００２１】Cr： 0〜0.95％ Crはスケール皮膜を緻密化して地金との密着力を改善す
るのに有効な成分であり、必要に応じて含有させる。含
有させる場合は 0.2％以上の含有でその効果が発揮され
る。しかし、含有量が0.95％を超えるとスケールの成長
が抑制されプラグ寿命が低下する。Cr: 0 to 0.95% Cr is a component effective for densifying the scale film and improving the adhesion with the base metal, and is contained as necessary. When it is contained, its effect will be exhibited when the content is 0.2% or more. However, if the content exceeds 0.95%, the growth of scale is suppressed and the plug life is shortened.
【００２２】Co： 0〜 5.0％ Coは靱性の改善に有効な元素であり、必要に応じて 0.1
％以上を含有させる。Co: 0 to 5.0% Co is an element effective in improving toughness, and if necessary, 0.1
% Or more.
【００２３】しかし、Co含有量が 5.0％を超えても効果
が飽和すると共に、逆に靱性を劣化させる。However, even if the Co content exceeds 5.0%, the effect is saturated and, conversely, the toughness is deteriorated.
【００２４】Nb： 0.1〜 2.0％、Ti：0.05〜 2.0％、お
よびZr：0.01〜 0.5％の内の１種または２種以上 Nb、Ti、Zrは鋼材の細粒化による靱性の向上およびスケ
ールの緻密化に有効な成分であり、必要に応じて１種ま
たは２種以上を上記下限値以上含有させる。しかし、そ
れぞれの含有量がNb、Tiでは 2.0％、Zrでは 0.5％を超
えると脆化層が析出し靱性を劣化させる。したがって、
Nb： 0.1〜 2.0％、Ti：0.05〜 2.0％、およびZr：0.01
〜 0.5％の内の１種または２種以上を必要に応じて含有
させることとした。One or more of Nb: 0.1 to 2.0%, Ti: 0.05 to 2.0%, and Zr: 0.01 to 0.5% Nb, Ti, and Zr are toughness improvement and scale due to fine graining of steel material. Is an ingredient effective for densification, and if necessary, one kind or two or more kinds are contained in the above lower limit value or more. However, if the respective contents exceed 2.0% for Nb and Ti and 0.5% for Zr, an embrittlement layer precipitates and the toughness deteriorates. Therefore,
Nb: 0.1-2.0%, Ti: 0.05-2.0%, and Zr: 0.01
It was decided to contain one or more of 0.5% to 0.5% as required.
【００２５】本発明では、上記成分以外にMg、Ca、La、
CeおよびＹの１種または２種以上を鋼材の細粒化による
靱性改善やスケールの密着力改善のために、合計量で
0.001〜 0.2％含有させてもよい。なお、下限の 0.001
％はその効果が得られる量であり、上限の 0.2％を超え
ると脆化層ができてプラグの強度が低下する。In the present invention, in addition to the above components, Mg, Ca, La,
One or more of Ce and Y are added in a total amount in order to improve the toughness and scale adhesion by refining the steel material.
You may contain 0.001 to 0.2%. The lower limit of 0.001
% Is the amount by which the effect can be obtained. If the upper limit of 0.2% is exceeded, an embrittlement layer is formed and the strength of the plug decreases.
【００２６】さらに、プラグ表面層の粒界の脆化を防止
し、高温での変形抵抗を改善するためにＢを 0.001〜
0.2％の範囲で含有させてもよい。Further, in order to prevent the grain boundary of the plug surface layer from becoming brittle and improve the deformation resistance at high temperatures, B is 0.001 to
You may contain in the range of 0.2%.
【００２７】（Ｂ）プラグ表面の酸化スケール皮膜の厚
さ 酸化スケール皮膜は断熱皮膜としてプラグの温度上昇を
抑制し、被圧延材との潤滑性能を付与するのに有効であ
る。酸化スケール皮膜の厚さが50μｍ未満では断熱効果
が不十分でありプラグの温度上昇によるプラグ先端の溶
損や、潤滑効果も不十分なため焼付が発生してしまう。
一方、酸化スケール皮膜の厚さが 500μｍを超えるとス
ケール皮膜内に空隙が多数発生し密着力が低下しスケー
ル皮膜が剥離し易くなる。したがって、プラグ表面の酸
化スケール皮膜の厚さは50〜 500μｍとした。(B) Thickness of oxide scale film on the surface of the plug The oxide scale film is effective as a heat insulating film for suppressing the temperature rise of the plug and imparting lubrication performance with the material to be rolled. If the thickness of the oxide scale film is less than 50 μm, the heat insulation effect is insufficient and the plug tip melts due to the temperature rise of the plug, and the lubrication effect is also insufficient, causing seizure.
On the other hand, when the thickness of the oxide scale film exceeds 500 μm, a large number of voids are generated in the scale film, the adhesion is reduced, and the scale film is easily peeled off. Therefore, the thickness of the oxide scale film on the plug surface is set to 50 to 500 μm.
【００２８】なお、プラグ表面の酸化スケール皮膜は、
上記組成の鋼を鍛造後必要により研削してプラグの形状
とし、大気中または水蒸気添加雰囲気中で 900〜1200℃
に 1〜10時間程度加熱保持した後冷却することで形成す
ることができる。The oxide scale film on the plug surface is
After forging the steel of the above composition, if necessary, grind it into the shape of a plug, and 900 to 1200 ° C in the atmosphere or in an atmosphere with steam added.
It can be formed by heating and holding for about 1 to 10 hours and then cooling.
【００２９】[0029]
【実施例】表１に示す化学成分の鋼を、大気溶解、真空
溶解、ＡＯＤまたはＶＯＤプロセスにより溶製し、その
後鍛造、外削にて穿孔圧延による継目無管製造用プラグ
の形状に仕上げた。その後上記プラグをブタン燃焼雰囲
気（ CO2、O2、H2O 、CO）で 900〜1200℃に加熱しプラ
グ表面へのスケール皮膜の形成を行った。なお、加熱保
持時間を変更することでスケール皮膜の厚さを調整し
た。得られたスケール皮膜の厚さおよびその融点を表２
に示す。EXAMPLE Steels having the chemical composition shown in Table 1 were melted by air melting, vacuum melting, AOD or VOD process, and then forged and trimmed to finish the shape of a plug for seamless pipe manufacturing by piercing and rolling. . Then, the plug was heated to 900 to 1200 ° C. in a butane combustion atmosphere (CO 2 , O 2 , H 2 O, CO) to form a scale film on the plug surface. The thickness of the scale film was adjusted by changing the heating and holding time. The thickness of the obtained scale film and its melting point are shown in Table 2.
Shown in
【００３０】また、得られた各プラグから試験片を採取
し、シャルピー衝撃値（試験片サイズ：10mm×10mm、 2
mmＵノッチ、試験温度：常温）および1000℃での圧縮変
形抵抗を求めた結果も表２に示す。A test piece was sampled from each of the obtained plugs, and the Charpy impact value (test piece size: 10 mm × 10 mm, 2
Table 2 also shows the results of determining the compression deformation resistance at mmU notch, test temperature: normal temperature) and 1000 ° C.
【００３１】次に、鋼種および酸化スケール皮膜厚さを
変更したプラグを用いて、SUS420J1（ 0.2％Ｃ−13％C
r）とSUS304（19％Cr-9％Ni）のステンレス鋼の穿孔圧
延を行い、プラグに焼付や割れが発生するまでの穿孔回
数を調査した。その結果も表２に合わせて示す。Next, SUS420J1 (0.2% C-13% C was used by using a plug having a different steel type and oxide scale film thickness.
r) and SUS304 (19% Cr-9% Ni) stainless steel was perforated and rolled, and the number of perforations before seizure or cracking of the plug occurred was investigated. The results are also shown in Table 2.
【００３２】[0032]
【表１】 [Table 1]
【００３３】[0033]
【表２】 [Table 2]
【００３４】表１および表２から、本発明鋼からなるプ
ラグはシャルピー衝撃値および圧縮変形抵抗も高く、ス
ケール皮膜の厚さが本発明範囲内のものでは、SUS420J1
材では穿孔回数が10回以上、SUS304材でも穿孔回数が 7
回以上と高温でも良好なスケールの安定性を示した。From Tables 1 and 2, the plugs made of the steel of the present invention have a high Charpy impact value and high compression deformation resistance, and if the thickness of the scale film is within the scope of the present invention, SUS420J1 is used.
The number of perforations is 10 or more for the material, and 7 for the SUS304 material
It showed good scale stability even at high temperatures and over.
【００３５】一方、Si含有量およびＷ含有量が本発明範
囲より多い鋼種Ｏ、Ｑ、Ｔ、ＶおよびＷではプラグ表面
に所定の厚さのスケール皮膜を形成しても、スケールの
融点が低いため穿孔圧延時の溶融によりスケールが消失
してしまいSUS420J1材では数回の圧延で、SUS304では１
回の圧延後にプラグ先端部の溶損や焼付が発生してしま
った。On the other hand, in the case of steel types O, Q, T, V and W having Si contents and W contents exceeding the range of the present invention, the melting point of the scale is low even if a scale film having a predetermined thickness is formed on the plug surface. Therefore, the scale disappears due to melting during piercing and rolling, and SUS420J1 material can be rolled several times, while SUS304 has 1
After rolling twice, melting and seizure of the plug tip occurred.
【００３６】また、Ｃ含有量が高くMn含有量が低い鋼種
Ｐでは、靱性および変形抵抗が低下しており、穿孔圧延
でプラグが変形した。さらに、Ni、MoおよびCr含有量が
高い鋼種Ｒ、Ｓ、Ｕでは、プラグ表面に形成されるスケ
ールの融点は高いが、スケール皮膜形成のための加熱保
持時間を長くしてもスケール皮膜の厚さを厚くできず、
断熱および潤滑性能が不十分となりプラグ先端の溶損や
焼付が発生した。Further, in steel type P having a high C content and a low Mn content, the toughness and the deformation resistance were lowered, and the plug was deformed by piercing and rolling. Further, in the steel types R, S, and U with high Ni, Mo, and Cr contents, the melting point of the scale formed on the plug surface is high, but the scale coating thickness is increased even if the heating and holding time for forming the scale coating is extended. Can not be thick,
The heat insulation and lubrication performance became insufficient, and the plug tip melted and seized.
【００３７】さらに、本発明鋼の内の数鋼種について、
酸化スケール皮膜形成のための加熱保持時間を変更して
スケール皮膜の厚さを本発明範囲より薄くまたは厚くし
たプラグでは、プラグ先端の溶損やプラグの焼き付きが
発生した。Further, regarding some of the steels of the present invention,
In a plug in which the heating and holding time for forming the oxide scale film was changed to make the thickness of the scale film thinner or thicker than the range of the present invention, melting damage at the plug tip and seizure of the plug occurred.
【００３８】[0038]
【発明の効果】本発明により、高Crステンレス鋼、Ni基
合金や高合金鋼等の変形抵抗が高く、焼付等が発生し易
い材料の穿孔圧延においても、優れた耐久性を有するプ
ラグを提供することができ、内面品質に優れた継目無管
を工業的に安定して製造することが可能となり、産業上
極めて有用である。According to the present invention, a plug having excellent durability is provided even in piercing and rolling of materials such as high Cr stainless steel, Ni-based alloys and high alloy steels that have high deformation resistance and are prone to seizure. This makes it possible to industrially stably manufacture a seamless pipe having an excellent inner surface quality, which is extremely useful industrially.
【００３９】[0039]
Claims (2)
0.5％、Mn： 0.2〜 3.0％、Ni： 0.5〜 7.0％、Ｗ： 0
〜 0.5％未満、Mo： 0.5〜 8.0％、Cr： 0〜0.95％、C
o： 0〜5.0％を含有し、残部がFeおよび不可避不純物か
らなる鍛造合金であって、その表面に50〜 500μｍの酸
化スケール皮膜を有することを特徴とする継目無管製造
用プラグ。1. By weight%, C: 0.01 to 0.5%, Si: 0 to
0.5%, Mn: 0.2 to 3.0%, Ni: 0.5 to 7.0%, W: 0
~ Less than 0.5%, Mo: 0.5 ~ 8.0%, Cr: 0 ~ 0.95%, C
o: A forged alloy containing 0 to 5.0%, the balance being Fe and unavoidable impurities, and having an oxide scale film of 50 to 500 μm on the surface thereof, a plug for producing a seamless pipe.
0.5％、Mn： 0.2〜 3.0％、Ni： 0.5〜 7.0％、Ｗ： 0
〜 0.5％未満、Mo： 0.5〜 8.0％、Cr： 0〜0.95％、C
o： 0〜5.0％を含有し、さらに、Nb： 0.1〜 2.0％、T
i：0.05〜 2.0％、およびZr：0.01〜 0.5％の内の１種
または２種以上を含むと共に、残部がFeおよび不可避不
純物からなる鍛造合金であって、その表面に50〜 500μ
ｍの酸化スケール皮膜を有することを特徴とする継目無
管製造用プラグ。2. By weight%, C: 0.01 to 0.5%, Si: 0 to
0.5%, Mn: 0.2 to 3.0%, Ni: 0.5 to 7.0%, W: 0
~ Less than 0.5%, Mo: 0.5 ~ 8.0%, Cr: 0 ~ 0.95%, C
o: 0-5.0%, Nb: 0.1-2.0%, T
i: 0.05 to 2.0%, and Zr: 0.01 to 0.5%, a forged alloy containing 1 or 2 or more types and the balance being Fe and unavoidable impurities, and 50 to 500 μ on the surface.
A plug for producing a seamless pipe, which has an oxide scale film of m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3046495A JPH08225887A (en) | 1995-02-20 | 1995-02-20 | Plug for producing seamless pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3046495A JPH08225887A (en) | 1995-02-20 | 1995-02-20 | Plug for producing seamless pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08225887A true JPH08225887A (en) | 1996-09-03 |
Family
ID=12304614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3046495A Pending JPH08225887A (en) | 1995-02-20 | 1995-02-20 | Plug for producing seamless pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08225887A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627956A (en) * | 2013-11-27 | 2014-03-12 | 江苏科技大学 | Wear-resistant intake valve and preparation method thereof |
| JP2014508218A (en) * | 2011-01-13 | 2014-04-03 | ロヴァルマ エス．アー． | Tool steel with high thermal diffusivity and high wear resistance |
| JP2017095802A (en) * | 2009-04-01 | 2017-06-01 | ロバルマ, ソシエダッド アノニマRovalma, S.A. | Hot work tool steel having excellent toughness and thermal conductivity |
| CN110616364A (en) * | 2018-06-20 | 2019-12-27 | 宝山钢铁股份有限公司 | Economical seamless steel pipe top with long piercing life and manufacturing method thereof |
-
1995
- 1995-02-20 JP JP3046495A patent/JPH08225887A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017095802A (en) * | 2009-04-01 | 2017-06-01 | ロバルマ, ソシエダッド アノニマRovalma, S.A. | Hot work tool steel having excellent toughness and thermal conductivity |
| JP2014508218A (en) * | 2011-01-13 | 2014-04-03 | ロヴァルマ エス．アー． | Tool steel with high thermal diffusivity and high wear resistance |
| CN103627956A (en) * | 2013-11-27 | 2014-03-12 | 江苏科技大学 | Wear-resistant intake valve and preparation method thereof |
| CN110616364A (en) * | 2018-06-20 | 2019-12-27 | 宝山钢铁股份有限公司 | Economical seamless steel pipe top with long piercing life and manufacturing method thereof |
| CN110616364B (en) * | 2018-06-20 | 2021-08-13 | 宝山钢铁股份有限公司 | Economical seamless steel pipe top with long piercing life and manufacturing method thereof |
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