JPH04147706A - Plug for producing seamless steel pipe - Google Patents
Plug for producing seamless steel pipeInfo
- Publication number
- JPH04147706A JPH04147706A JP2272339A JP27233990A JPH04147706A JP H04147706 A JPH04147706 A JP H04147706A JP 2272339 A JP2272339 A JP 2272339A JP 27233990 A JP27233990 A JP 27233990A JP H04147706 A JPH04147706 A JP H04147706A
- Authority
- JP
- Japan
- Prior art keywords
- plug
- life
- seamless steel
- steel pipe
- less
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract 3
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 24
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 1
- 238000005553 drilling Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010953 base metal Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、継目無鋼管製造用プラグに係り、特に５％以
上のＣｒを含有する高Ｃｒ含有鋼の継目無鋼管を製造す
るに好適な継目無鋼管製造用プラグに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a plug for producing seamless steel pipes, and is particularly suitable for producing seamless steel pipes of high Cr content steel containing 5% or more of Cr. Concerning plugs for seamless steel pipe manufacturing.
［従来の技術］
５％以上のＣｒを含有する高Ｃｒ含有鋼の継目無鋼管を
製造する場合には、穿孔機であるとアサのプラグ寿命が
著しく短い。[Prior Art] When manufacturing seamless steel pipes made of high Cr-containing steel containing 5% or more of Cr, the life of the plug is extremely short if a drilling machine is used.
そこで従来、プラグ寿命向上のため、プラグ材質の改善
が提案されてきた０例えば、特開昭６０−１５９１５６
号公報や特開昭６０−２０８４５８号公報では、３Ｃｒ
−ＩＮ ｉ鋼をベースにＭｏやＷを添加したプラグ材
質が提案され、或いは、特開昭６３−２０３２０５号公
報では、プラグ先端部にＭｏ基合金を接合することが提
案されている。Therefore, improvements to the plug material have been proposed in the past in order to extend the life of the plug.
No. 60-208458, 3Cr
-IN A plug material based on i steel to which Mo or W is added has been proposed, or Japanese Patent Laid-Open No. 63-203205 proposes joining a Mo-based alloy to the tip of the plug.
［発明が解決しようとする課題］
然しながら、穿孔用プラグの寿命をプラグ材質の変更た
けで改善することには限界があり、例えば、５ＵＳ３０
４の直径１１０１φビレツトを穿孔する場合、プラグ寿
命は３本／個（１個のプラグにて穿孔できるビレット数
が３本のみ）に過ぎない。[Problems to be Solved by the Invention] However, there is a limit to improving the life of the piercing plug simply by changing the plug material.
When drilling a 1101φ billet with a diameter of 4, the plug life is only 3 pieces/piece (the number of billets that can be drilled with one plug is only 3).
本発明は、継目無鋼管製造のための穿孔用プラグの寿命
を向上することを目的とする。An object of the present invention is to improve the life of a drilling plug for producing seamless steel pipes.
［課題を解決するための手段］
請求項１に記載の継目無鋼管製造用プラグは、プラグ径
をＤｐ、プラグ有効長をＬｐとするとき、
Ｄｐ
とするようにしだものである。[Means for Solving the Problems] The plug for seamless steel pipe manufacturing according to claim 1 is designed such that Dp is the plug diameter and Lp is the plug effective length.
請求項２に記載の本発明は、請求項１に記載の継目無鋼
管製造用プラグにおいて更に、プラグ先端半径ｒを１０
ｍｍ以上３０曹膳以下とするようにしたものである。The present invention as set forth in claim 2 further provides the plug for producing seamless steel pipes as set forth in claim 1, wherein the radius r of the plug tip is set to 10.
The length is set to be at least 30 mm and at most 30 mm.
請求項３に記載の本発明は、請求項１又は２記載の継目
無鋼管製造用プラグにおいて更に、重量比にて、
Ｃ：０．１０〜０．４０％、 Ｓ ｉ ： ０．１０
〜１．００％。The present invention according to claim 3 is the plug for seamless steel pipe production according to claim 1 or 2, further comprising: C: 0.10 to 0.40%, Si: 0.10 in terms of weight ratio.
~1.00%.
Ｍ ｎ ： ０．２０〜２．００％、 Ｃｒ：０．９
５％以下。Mn: 0.20-2.00%, Cr: 0.9
Less than 5%.
Ｍ ｏ ： ０．５０〜５．００％、 Ｗ ： ０
．５０〜５．００％。Mo: 0.50-5.00%, W: 0
．． 50-5.00%.
Ｎ ｂ ： ０．１０〜５．００％。Nb: 0.10-5.00%.
を含有し、残部はＦｅと不可避的不純物からなる鋳造合
金より成形され、その表面に酸化スケール付着処理を施
されたプラグを用いるようにしだものである。The plug is molded from a cast alloy containing Fe and unavoidable impurities, and the surface of the plug is subjected to oxide scale adhesion treatment.
請求項４に記載の本発明は、請求項１又は２記載の継目
無銅管製造用プラグにおいて更に、重量比にて、
Ｃ：０．１０〜０．４０％、 Ｓ ｉ ： ０．１０
〜１．００％。The present invention according to claim 4 provides the seamless copper pipe manufacturing plug according to claim 1 or 2, further comprising: C: 0.10 to 0.40%, Si: 0.10 in terms of weight ratio.
~1.00%.
Ｍ ｎ ： ０．２０〜２．００％、 Ｃｒ：０．９
５％以下。Mn: 0.20-2.00%, Cr: 0.9
Less than 5%.
Ｍ ｏ ： ０．５０〜５．００％、 Ｗ ： ０
．５０〜５．００％。Mo: 0.50-5.00%, W: 0
．． 50-5.00%.
Ｎ ｂ ： ０．１０〜５．００％。Nb: 0.10-5.00%.
を含有し、更に
Ｎ ｉ ： ０．５０〜５．００％、 Ｃｏ ： ０
．５０〜３．５０％。and further contains Ni: 0.50 to 5.00%, Co: 0
．． 50-3.50%.
Ｖ □： ０．０５〜５．００％、 Ｎ ： ０
．０１〜０．３０％のうちから選ばれた１種又は２種以
上を含有し、残部はＦｅと不可避的不純物からなる鋳造
合金より成形され、その表面に酸化スケール付着処理を
施されたプラグを用いるようにしたものである。V□: 0.05-5.00%, N: 0
．． The plug is made of a cast alloy containing one or more selected from 01 to 0.30%, with the remainder consisting of Fe and unavoidable impurities, and the surface of which is treated with oxide scale adhesion. It was designed to be used.
［作用］
本発明者は、鋭意研究の結果、プラグ形状の改善により
プラグ寿命を向上でき、更に、プラグ材質を加味するこ
とによりプラグ寿命を更に向上できることを認めた。[Function] As a result of intensive research, the inventor of the present invention has found that the life of the plug can be improved by improving the shape of the plug, and that the life of the plug can be further improved by considering the plug material.
第１図は本発明のプラグ形状を示す、ここで、第１図の
プラグは、長さＬｌのワーク部、長さＬ２のリーリング
部、長さＬ３の平行部とからなっているが、本発明の実
施において、リーリング部と平行部を備えることは必須
でない、尚、ワーク部は、縦断側面において所定曲率半
径の曲面状をなし、傾斜圧延ロールによって回転及び軸
方向に移動せしめられる素材の中心部に押し当てられて
素材を穿孔する。また、リーリング部は、縦断側面にお
いて所定角度のテーバ面状をなし、ワーク部によって穿
孔された素材の内面を平滑化する。従って、穿孔、圧延
、平滑化に寄与するプラグの有効長をＬｐとすると、Ｌ
ｐ＝Ｌ １ ＋Ｌ２である。また、平行部は、円筒面状
をなし、素管の内面に略遊装可能となっている。FIG. 1 shows the plug shape of the present invention. Here, the plug in FIG. 1 consists of a work part with a length Ll, a reeling part with a length L2, and a parallel part with a length L3. In carrying out the present invention, it is not essential to have a reeling part and a parallel part.The work part has a curved surface shape with a predetermined radius of curvature on the longitudinal side surface, and is a material that is rotated and moved in the axial direction by an inclined rolling roll. is pressed against the center of the material to perforate the material. Further, the reeling portion has a tapered surface shape with a predetermined angle on the longitudinal side surface, and smoothes the inner surface of the material drilled by the work portion. Therefore, if the effective length of the plug that contributes to drilling, rolling, and smoothing is Lp, then L
p=L 1 +L2. Moreover, the parallel part has a cylindrical surface shape and can be loosely mounted on the inner surface of the raw pipe.
本発明のプラグ形状は、請求項１．２にそれぞれ記載の
如く、下記（１） 、（２）を特徴とする。The plug shape of the present invention is characterized by the following (1) and (2) as described in claims 1 and 2, respectively.
（１）プラグ径をＤｐ、プラグ有効長をＬｐとするとき
、
Ｌｐ−６０
とすること。(1) When the plug diameter is Dp and the plug effective length is Lp, it should be Lp-60.
（２）プラグ先端半径ｒを１０ｍｍ以上３０■■以下と
すること。(2) The plug tip radius r should be 10 mm or more and 30 mm or less.
第２図は、（Ｌｐ−５０）／Ｄｐとプラグ寿命との関係
を示す、（Ｌｐ −５０）／Ｄｐが １．５以上になる
と、著しくプラグ寿命が長期化する。これは、■プラグ
有効長Ｌｐが長いのでプラグの熱容量が大であること、
■プラグ有効長Ｌｐが長いので同−減肉厚を達成するた
めの圧延長さが長くなり、結果として、穿孔がスムーズ
となり、平均歪速度が遅くなるため、プラグの負荷が軽
減されること、等に起因するものと推察される。FIG. 2 shows the relationship between (Lp-50)/Dp and plug life. When (Lp-50)/Dp becomes 1.5 or more, the plug life becomes significantly longer. This is because ■The effective length Lp of the plug is long, so the heat capacity of the plug is large;
■Since the plug effective length Lp is long, the rolling length to achieve the same thickness reduction becomes longer, resulting in smoother drilling and slower average strain rate, which reduces the load on the plug. It is presumed that this is due to the following.
尚、（Ｌｐ −５０） ／Ｄｐは長い程良いが、３．５
以下が望ましい、これは、■（Ｌｐ−５０）／Ｄｐを３
，５超としてもプラグ寿命はそれ程延びないのに重くな
るので原単位が悪化すること、■素材はロールとプラグ
の間で圧延されるのであって、プラグのみが長くなって
もロール胴長が短ければ圧延されず、ロール胴長より長
いプラグは考えられない、等による。The longer (Lp -50) /Dp is, the better, but 3.5
The following is desirable, which means that ■(Lp-50)/Dp is 3
, Even if it exceeds 5, the life of the plug will not be extended that much, but it will become heavier, which will worsen the unit consumption. ■The material is rolled between the roll and the plug, so even if only the plug becomes longer, the length of the roll body will increase. If it is short, it will not be rolled, and a plug longer than the roll body length is unthinkable.
また、プラグ先端半径ｒが１０１未満の場合、先端半径
ｒが小さ過ぎてプラグ先端部の熱容量が過小となって溶
損し易くなる。他方、プラグ先端半径ｒが３０■■より
大であると、プラグ先端部にて被圧延材が強圧下され過
ぎるので、プラグ先端部への負荷が過大となり、この場
合にも溶損し易くなる。また、プラグ先端半径ｒが３０
ｍｍより大であると、穿孔速度も遅くなり、プラグへの
受熱量が大となるため、これによってもプラグ寿命は低
下する。In addition, if the plug tip radius r is less than 101, the tip radius r is too small and the heat capacity of the plug tip becomes too small, making it easy to melt. On the other hand, if the plug tip radius r is larger than 30■■, the material to be rolled will be rolled down too strongly at the plug tip, resulting in an excessive load on the plug tip, and in this case as well, melting and damage will occur. Also, the plug tip radius r is 30
If it is larger than mm, the drilling speed will be slow and the amount of heat received by the plug will be large, which also shortens the life of the plug.
プラグ寿命は、上記形状によりて著しく改善されるが、
請求項３．４のそれぞれに記載のプラグ材質をあわせ採
用することにより更に向上する。Although the plug life is significantly improved by the above shape,
Further improvement can be achieved by employing the plug materials described in each of claims 3 and 4.
即ち、本発明者は、本発明のプラグ形状を持つプラグに
おいて、１％以上のＣｒを含有するものについて、高Ｃ
ｒ含有鋼を穿孔した場合、Ｃｒの酸化物を含む酸化スケ
ールが穿孔中に高Ｃｒ被穿孔材と密着する傾向にあり、
プラグ側の酸化スケールが被穿孔材によってこすり取ら
れて、断熱効果、潤滑効果が消失し、プラグのえぐれ又
は被穿孔材の焼付が生じて寿命が著しく低下することを
見い出した。That is, the present inventor has found that, in plugs having the plug shape of the present invention, those containing 1% or more of Cr have a high carbon content.
When drilling r-containing steel, oxide scale containing Cr oxides tends to adhere to the high-Cr drilled material during drilling,
It has been found that the oxidized scale on the plug side is scraped off by the material to be drilled, the insulation effect and lubricating effect are lost, and the plug is gouged or the material to be drilled is sequestered, resulting in a significant reduction in service life.
そして、本発明者は、本発明のプラグ形状を持つプラグ
においてそのＣｒ含有量を低減し、適切なプラグ表面の
高温酸化スケール付着処理によって地鉄との界面近傍の
スケールを穿孔中に高Ｃｒを含有する被穿孔材にこすり
取られることなく、むしろプラグ表面に強固に溶着され
るようなＦｅＯ主体の組成とし、更に適当量のＭｏ、Ｗ
、Ｎｂ、Ｎｉ、Ｃｏ、Ｖ、Ｎを添加して高温強度と表面
酸化スケールの地鉄への密着性を高めることにより、高
Ｃｒを含有するステンレス鋼の穿孔及び伸延加工用の高
寿命プラグ材料を得ることがてきた。Then, the present inventor reduced the Cr content in the plug having the plug shape of the present invention, and removed high Cr during drilling to remove the scale near the interface with the base iron by an appropriate high-temperature oxide scale adhesion treatment on the plug surface. The FeO-based composition is such that it is not scraped off by the contained material to be drilled, but is rather firmly welded to the plug surface, and further contains appropriate amounts of Mo and W.
, Nb, Ni, Co, V, and N are added to improve high-temperature strength and adhesion of surface oxide scale to the base steel, resulting in a long-life plug material for drilling and drawing of stainless steel containing high Cr. I've been able to get this.
次に、本発明における化学成分の限定理由について述べ
る。ここで、成分組成は全て重量％である。Next, the reasons for limiting the chemical components in the present invention will be described. Here, all component compositions are in percent by weight.
Ｃ：
Ｃは高温強度を高めるために添加されるが、０．１０％
未満ではその効果がなく、０．４０％を越えると使用中
に割れが発生し易くなり、プラグの寿命を著しく低下さ
せる。C: C is added to increase high temperature strength, but 0.10%
If it is less than 0.40%, it will not be effective, and if it exceeds 0.40%, cracks will easily occur during use, significantly shortening the life of the plug.
Ｓｉ：
Ｓｉは脱酸のために添加されるが、０．１０％未満では
その効果が小さく、１．００％を越えると酸化スケール
付着量が少なくなり寿命を低下させる。Si: Si is added for deoxidation, but if it is less than 0.10%, its effect is small, and if it exceeds 1.00%, the amount of oxide scale deposited will decrease and the life will be shortened.
Ｍｎ：
Ｍｎは高温強度を高めるために添加されるが、０．２０
％未満ではその効果が小さく、２．００％を越えると穿
孔中の熱履歴により、熱疲労割れが発生し易くなり寿命
を低下させる。Mn: Mn is added to increase high temperature strength, but 0.20
If it is less than 2.00%, the effect is small, and if it exceeds 2.00%, thermal fatigue cracking is likely to occur due to the thermal history during drilling, reducing the life.
Ｃｒ：
Ｃｒは表面に地鉄合金との密着性が良く、且つ断熱性の
良いスケールを生成させ、またＣｒの炭化物生成による
高温強度の増加のために添加されるが、０．９５％を越
えると地鉄界面近傍のスケール組成が全てＦ ｅ Ｃｒ
ｓｏ ４となり、９％以上の如くの高Ｃｒを含有する材
料を穿孔する場合、プラグ側のスケールが被圧延材にこ
すり取られるため寿命が低下する。Cr: Cr is added to form a scale on the surface that has good adhesion to the base metal alloy and has good heat insulation properties, and to increase high temperature strength by forming carbides of Cr, but it is added in an amount exceeding 0.95%. The scale composition near the interface with the base metal is all F e Cr
So 4, when drilling a material containing high Cr such as 9% or more, the scale on the plug side is scraped off by the rolled material, resulting in a shortened service life.
ＭＯ：
Ｍｏは高温強度を高めるために添加されるが、０．５０
％未満ではその効果が小さく、５．０％を越えると酸化
スケール生成量が低下し寿命が著しく低下する。MO: Mo is added to increase high temperature strength, but 0.50
If it is less than 5.0%, the effect will be small, and if it exceeds 5.0%, the amount of oxide scale produced will decrease and the life will be significantly shortened.
Ｗ ：
Ｗは高温強度を高めるために添加されるが、０．５０％
未満ではその効果が小さく、５．０％を越えると酸化ス
ケール生成量が低下し寿命が著しく悪化する。W: W is added to increase high temperature strength, but 0.50%
If it is less than 5.0%, the effect will be small, and if it exceeds 5.0%, the amount of oxide scale produced will decrease and the life will be significantly shortened.
Ｎｂ：
Ｎｂは高温強度を高めるために添加されるが、０．０５
％未満ではその効果が小さく、５．０％を越えると穿孔
中に割れが発生し易くなり、寿命を低下させる。Nb: Nb is added to increase high temperature strength, but 0.05
If it is less than 5.0%, the effect is small, and if it exceeds 5.0%, cracks are likely to occur during drilling, reducing the lifespan.
上記Ｃ，Ｓｔ、Ｍｎ、ＣｒｌＭｏ； Ｗ％Ｎｂの各限定
量を本発明の穿孔又は伸延加工用プラグ材の必須成分と
するが、更にＮｉ、Ｃｏ、Ｖ、Ｎを下記限定量内におい
て１種又は２種以上含有させることにより、本発明の目
的を達成することがてきる。Each of the above limited amounts of C, St, Mn, CrlMo; W%Nb are essential components of the plug material for drilling or stretching of the present invention, and one type of Ni, Co, V, and N within the following limited amounts are also included. Alternatively, the object of the present invention can be achieved by containing two or more kinds.
Ｎ ｉ ：
Ｎｉは酸化雰囲気中における加熱中に選択４酸化を促進
し界面のスケールを根か生えたような形状にして、密着
性を高めプラグ寿命を向上させるが、０．５０％未満で
はその効果が小さく、５．０％を越えるとスケール生成
量か低下し、寿命が著しく悪化する。Ni: Ni promotes selective 4-oxidation during heating in an oxidizing atmosphere and makes the scale at the interface look like a root, increasing adhesion and extending the life of the plug, but if it is less than 0.50%, the The effect is small, and if it exceeds 5.0%, the amount of scale formed will decrease and the life will be significantly shortened.
ＣＯ：
Ｃｏは高温強度を高めると共に、酸化雰囲気中における
加熱中に選択酸化を促進し、また地鉄界面近傍のスケー
ル中に金属粒を多数生成させてスケールと地鉄の密着性
を著しく高めて、プラグ寿命を延長させるが、０．５０
％未満ではその効果が小さく、３．５％を越えるとスケ
ール生成量か低下し寿命が悪化する。CO: Co increases high-temperature strength, promotes selective oxidation during heating in an oxidizing atmosphere, and generates many metal grains in the scale near the interface of the base metal, significantly increasing the adhesion between the scale and the base metal. , prolongs plug life, but 0.50
If it is less than 3.5%, the effect will be small, and if it exceeds 3.5%, the amount of scale formed will decrease and the life will be shortened.
Ｖ ：
■は高温強度を高めるために添加されるが、０．０５％
未満ではその効果が小さく、５．０％を越えると穿孔中
にプラグ割れが発生し易くなり、寿命を著しく低下させ
る。V: ■ is added to increase high temperature strength, but 0.05%
If it is less than 5.0%, the effect is small, and if it exceeds 5.0%, plug cracking is likely to occur during drilling, significantly shortening the life.
Ｎ：
Ｎは高温強度を高めるために添加されるが、０．０１％
未満ではその効果がなく 、０．３０％を越えると窒化
物が多量に析出するため、使゛用中に割れが発生し易く
なり、プラグ寿命は逆に低下する。N: N is added to increase high temperature strength, but 0.01%
If it is less than 0.30%, it will not be effective, and if it exceeds 0.30%, a large amount of nitrides will precipitate, making it easier for cracks to occur during use, and conversely shortening the life of the plug.
また、酸化雰囲気中におけるスケール付着処理時の温度
を９００〜１０５０℃の範囲としたのは９００℃以下の
ときにはスケールの生産量が少なく、また１０５０℃を
越えるときにはスケール中に空隙が多くなり密着性が低
下して、いずれの場合もプラグの寿命の低下が著しい。In addition, the temperature during scale adhesion treatment in an oxidizing atmosphere was set in the range of 900 to 1050°C.When the temperature is below 900°C, the amount of scale produced is small, and when the temperature exceeds 1050°C, there are many voids in the scale, resulting in poor adhesion. In either case, the life of the plug is significantly reduced.
上記温度範囲における保持時間が１時間未満のときには
スケール生成量が少なくプラグの寿命が低下するが２４
時間で生成量−は飽和し、これ以上保持するのは生産性
を低下させ、加熱原単位を上昇させるだけであるので無
意味である。If the holding time in the above temperature range is less than 1 hour, the amount of scale generated will be small and the life of the plug will be shortened.
The production amount reaches saturation over time, and it is meaningless to hold it any longer because it only reduces productivity and increases heating consumption.
［実施例１］
プラグ径Ｄｐが７８■■φ、プラグ有効長Ｌｐが１２２
ｍｍ 、先端半径ｒが５１の比較例としての■型と、同
一プラグ径でプラグ有効長Ｌｐが２３０■、先端半径ｒ
が１５■■の本発明例の■型の、２種類のプラグ形状を
用意した。そして、それら■型、■型の両プラグ形状の
プラグの材質として、表１に示す如く、比較例としての
Ａ材質と、本発明例としてのＢ、Ｃ材質とを適用した。[Example 1] Plug diameter Dp is 78■■φ, plug effective length Lp is 122
mm, a type ■ as a comparative example with a tip radius r of 51, and a type with the same plug diameter, a plug effective length Lp of 230■, and a tip radius r
Two types of plug shapes were prepared, including the ■ type of the present invention example with a diameter of 15■■. As shown in Table 1, material A as a comparative example and materials B and C as examples of the present invention were used as the materials for the plugs of both the ■-type and ■-type plug shapes.
上記の如くによって用意した６種類のプラグ（ＩＡ、Ｉ
Ｂ、ＩＣ１ＩｒＡ、ＩＩＢ、■Ｃの６種類）を用いて、
５ＵＳ３０４の直径１１０ｓｍＯビレットを穿孔した。Six types of plugs (IA, I
B, IC1IrA, IIB, ■C),
A 5US304 diameter 110smO billet was perforated.
表２は、各プラグの寿命を示す０本発明品であるｍＡ、
ＩＩＢ、ＩＩＣのプラグは、比較例としてのＩＡのプラ
グに比して著しく寿命向上できることが認められる。Table 2 shows the lifespan of each plug, mA, which is the product of the present invention,
It is recognized that the life of the IIB and IIC plugs can be significantly improved compared to the IA plug as a comparative example.
［実施例２］
プラグ径Ｄｐが１４６■■φ、プラグ有効長ｔ、ｐが２
５０ａｍ 、先端半径ｒが２０鳳■の■型（比較材）と
、プラグ有効長Ｌｐが３５０１■、先端半径ｒが２０ｍ
■の■型（本発明材）の２種類のプラグ形状に、表１の
Ａ材質とＤ材質を適用した４種類のプラグ（ＩＩＩＡ、
ｌｌＩＤ、ｒＶＡ、ＩＶＤの４種類）を用いて、１３
％Ｃｒ＠の直径１７５ｍｍφビレットを傾斜圧延機にて
穿孔した。[Example 2] Plug diameter Dp is 146■■φ, plug effective length t, p is 2
50 am, the tip radius r is 20 mm (comparative material), the plug effective length Lp is 3501 ■, and the tip radius r is 20 m.
Four types of plugs (IIIA,
llID, rVA, IVD), 13
%Cr@ diameter 175 mmφ billet was perforated using an inclined rolling mill.
表３は、各プラグの寿命を示す０本発明品である■Ａ、
ＩＶＤのプラグは、比較例としてのＷＩＡのプラグに比
して著しく寿命向上できることが認められる。Table 3 shows the lifespan of each plug.
It is recognized that the life of the IVD plug can be significantly improved compared to the WIA plug as a comparative example.
［発明の効果］
以上のように本発明によれば、継目無鋼管製造のための
穿孔用プラグの寿命を向上することができる。[Effects of the Invention] As described above, according to the present invention, the life of a drilling plug for manufacturing seamless steel pipes can be improved.
第１図はプラグ形状を示す模式図、第２図はプラグ形状
とプラグ寿命との関係を示す線図である。
代理人 弁理士 塩 川 修 治FIG. 1 is a schematic diagram showing the plug shape, and FIG. 2 is a diagram showing the relationship between the plug shape and the plug life. Agent Patent Attorney Osamu Shiokawa
Claims (4)
、 １．５≦（Ｌｐ−５０）／（Ｄｐ） とする継目無鋼管製造用プラグ。(1) A plug for seamless steel pipe manufacturing, where 1.5≦(Lp-50)/(Dp), where the plug diameter is Dp and the plug effective length is Lp.
する請求項１記載の継目無鋼管製造用プラグ。(2) The plug for producing seamless steel pipes according to claim 1, wherein the plug tip radius r is 10 mm or more and 30 mm or less.
％，Ｍｎ：０．２０〜２．００％，Ｃｒ：０．９５％以
下，Ｍｏ：０．５０〜５．００％，Ｗ：０．５０〜５．
００％，Ｎｂ：０．１０〜５．００％， を含有し、残部はＦｅと不可避的不純物からなる鋳造合
金より成形され、その表面に酸化スケール付着処理を施
された請求項１又は２記載の継目無鋼管製造用プラグ。(3) In weight ratio, C: 0.10-0.40%, Si: 0.10-1.00
%, Mn: 0.20-2.00%, Cr: 0.95% or less, Mo: 0.50-5.00%, W: 0.50-5.
00%, Nb: 0.10 to 5.00%, and the remainder is Fe and unavoidable impurities. The alloy is molded from a cast alloy, and the surface thereof is subjected to oxide scale adhesion treatment. Plug for seamless steel pipe manufacturing.
％，Ｍｎ：０．２０〜２．００％，Ｃｒ：０．９５％以
下，Ｍｏ：０．５０〜５．００％，Ｗ：０．５０〜５．
００％，Ｎｂ：０．１０〜５．００％， を含有し、更に Ｎｉ：０．５０〜５．００％，Ｃｏ：０．５０〜３．５
０％，Ｖ：０．０５〜５．００％，Ｎ：０．０１〜０．
３０％のうちから選ばれた１種又は２種以上を含有し、
残部はＦｅと不可避的不純物からなる鋳造合金より成形
され、その表面に酸化スケール付着処理を施された請求
項１又は２記載の継目無鋼管製造用プラグ。(4) In weight ratio, C: 0.10-0.40%, Si: 0.10-1.00
%, Mn: 0.20-2.00%, Cr: 0.95% or less, Mo: 0.50-5.00%, W: 0.50-5.
00%, Nb: 0.10-5.00%, further contains Ni: 0.50-5.00%, Co: 0.50-3.5
0%, V: 0.05-5.00%, N: 0.01-0.
Contains one or more selected from 30%,
3. The plug for manufacturing a seamless steel pipe according to claim 1, wherein the remaining part is formed from a cast alloy consisting of Fe and inevitable impurities, and the surface of the plug is subjected to an oxide scale adhesion treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2272339A JPH0787930B2 (en) | 1990-10-12 | 1990-10-12 | Seamless steel pipe manufacturing plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2272339A JPH0787930B2 (en) | 1990-10-12 | 1990-10-12 | Seamless steel pipe manufacturing plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04147706A true JPH04147706A (en) | 1992-05-21 |
| JPH0787930B2 JPH0787930B2 (en) | 1995-09-27 |
Family
ID=17512515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2272339A Expired - Fee Related JPH0787930B2 (en) | 1990-10-12 | 1990-10-12 | Seamless steel pipe manufacturing plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0787930B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6988387B2 (en) * | 2002-12-12 | 2006-01-24 | Sumitomo Metal Industries, Ltd. | Making method for seamless metallic tube |
| EP1887096A1 (en) * | 2006-08-09 | 2008-02-13 | Rovalma, S.A. | Hot working steel |
| EP2236639A1 (en) * | 2009-04-01 | 2010-10-06 | Rovalma, S.A. | Hot work tool steel with outstanding toughness and thermal conductivity |
| EP2476772A1 (en) * | 2011-01-13 | 2012-07-18 | Rovalma, S.A. | High thermal diffusivity and high wear resistance tool steel |
| US9764366B2 (en) | 2012-04-11 | 2017-09-19 | Nippon Steel & Sumitomo Metal Corporation | Method for regenerating a plug for use in a piercing machine |
| CN110918842A (en) * | 2019-11-28 | 2020-03-27 | 衡阳鸿宇机械制造有限公司 | Process for preparing common seamless steel grade steel pipe by adopting 35CrMo as plug material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61137612A (en) * | 1984-12-07 | 1986-06-25 | Sumitomo Metal Ind Ltd | Skew rolling method of metallic pipe and plug used for rolling |
| JPS63282241A (en) * | 1987-05-12 | 1988-11-18 | Kawasaki Steel Corp | Tool material for borine on high cr seamless steel pipe |
-
1990
- 1990-10-12 JP JP2272339A patent/JPH0787930B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61137612A (en) * | 1984-12-07 | 1986-06-25 | Sumitomo Metal Ind Ltd | Skew rolling method of metallic pipe and plug used for rolling |
| JPS63282241A (en) * | 1987-05-12 | 1988-11-18 | Kawasaki Steel Corp | Tool material for borine on high cr seamless steel pipe |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPH0787930B2 (en) | 1995-09-27 |
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