JP5691937B2 - How to use tools for seamless steel pipe piercing and rolling - Google Patents
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Description
本発明は、継目無鋼管の製造で使用するプラグ等の穿孔圧延用工具の使用方法に係り、とくに穿孔圧延用工具の耐久性向上に関する。 The present invention relates to a method of using a piercing and rolling tool such as a plug used in the production of a seamless steel pipe, and more particularly to improving the durability of the piercing and rolling tool.
従来から、継目無鋼管の製造方法として、マンネスマン式製管法が広く用いられている。この方法は、所定の温度に加熱された圧延素材（丸鋼片あるいは丸鋳片）を、まず、穿孔圧延機による穿孔圧延工程を経て、中空素材としたのち、エロンゲータ、プラグミル、またはマンドレルミル等の延伸圧延機により肉厚を減少し、さらに必要に応じて再加熱したのち、絞り圧延機あるいはその他の成形機により、主として外径を減じて所望の寸法の継目無鋼管を得る方法である。 Conventionally, the Mannesmann type pipe manufacturing method has been widely used as a method for manufacturing a seamless steel pipe. In this method, a rolled material (round steel slab or round slab) heated to a predetermined temperature is first subjected to a piercing and rolling process by a piercing and rolling machine to be a hollow material, and then an elongator, a plug mill, a mandrel mill, or the like This is a method of obtaining a seamless steel pipe having a desired size mainly by reducing the outer diameter with a drawing mill or other forming machine after reducing the wall thickness by using a stretching mill and reheating as necessary.
穿孔圧延機としては、２本の傾斜ロールと穿孔用プラグおよび２個のガイドシュウを組み合わせた、いわゆるマンネスマンピアサ、３本の傾斜ロールと穿孔用プラグを組み合わせた、いわゆる３ロールピアサ、あるいは２本の孔型ロールと穿孔用プラグとを組み合わせた、いわゆるプレスロールピアサが知られている。このような穿孔圧延機による穿孔圧延工程では、穿孔用プラグは、高温の圧延素材や中空素材との絶え間ない接触により、高温、高負荷の環境下に長時間晒され、摩耗、溶損等を生じやすい。このため、従来から、穿孔用プラグに高温でのスケール処理を施し、プラグ表面に数十〜数百μm厚の酸化スケール被膜を形成させて、プラグの損耗を防止していた。 As a piercing and rolling mill, a so-called Mannesmann piercer combining two inclined rolls and a piercing plug and two guide shoes, a so-called three-roll piercer combining three inclined rolls and a piercing plug, or two A so-called press roll piercer is known that combines a perforated roll and a perforated plug. In the piercing and rolling process using such a piercing and rolling machine, the piercing plug is exposed to a high temperature and high load environment for a long time due to constant contact with a high temperature rolling material or hollow material, resulting in wear, erosion, etc. Prone to occur. For this reason, conventionally, a plug for drilling has been subjected to a scale treatment at a high temperature to form an oxide scale film with a thickness of several tens to several hundreds of μm on the plug surface, thereby preventing the plug from being worn.
しかし、最近では、熱間変形抵抗が高く、しかも表面に酸化スケールが形成されにくい、13Cr鋼や、ステンレス鋼等の高合金鋼製継目無鋼管の需要が増加している。このような高合金鋼の素材を穿孔圧延すると、プラグ表面に形成した酸化スケール被膜の損耗が激しくなり、とくにプラグ先端部の変形や焼付きを伴う損傷が早期に多発するため、プラグを早期に交換することが必要となる。このため、プラグコストの高騰を招き、さらに継目無鋼管の生産性の低下をも招くという問題があった。 Recently, however, there has been an increasing demand for seamless steel pipes made of high alloy steel such as 13Cr steel and stainless steel, which have high hot deformation resistance and are difficult to form oxide scale on the surface. When such a high-alloy steel material is pierced and rolled, the oxide scale coating formed on the plug surface is severely worn, and damage to the plug tip, such as deformation and seizure, frequently occurs at an early stage. It is necessary to exchange. For this reason, there has been a problem that the plug cost is increased, and the productivity of the seamless steel pipe is also lowered.
このような問題に対し、例えば、特許文献１、特許文献２、特許文献３には、プラグの組成や、スケール処理条件を適正化して、酸化スケール被膜の密着性、耐摩耗性を向上させ、プラグを長寿命化する方法が提案されている。
しかし、特許文献１、特許文献２、特許文献３に記載された技術では、プラグの長寿命化へのある程度の効果は認められるが、合金元素の多量含有を必要とし、あるいはプラグのスケール処理が複雑となり、プラグの生産性が低下し大量生産ができず、プラグの製造コストが高騰するうえ、プラグ寿命が低下するという問題があった。さらに、最近では、高合金鋼製継目無鋼管の需要増加に伴い、一層のプラグの長寿命化が要求されている。
For such problems, for example, Patent Document 1, Patent Document 2, and Patent Document 3 optimize the plug composition and scale treatment conditions to improve the adhesion and wear resistance of the oxide scale film, A method for extending the life of the plug has been proposed.
However, in the techniques described in Patent Document 1, Patent Document 2, and Patent Document 3, a certain degree of effect for extending the life of the plug is recognized, but a large amount of alloy element is required, or the plug is not scaled. There is a problem that the productivity of the plug is reduced, the mass production of the plug cannot be reduced, the manufacturing cost of the plug is increased, and the life of the plug is reduced. Furthermore, recently, with the increase in demand for seamless steel pipes made of high alloy steel, there has been a demand for longer plug life.
このような要求に対し、たとえば、特許文献４には、穿孔圧延プラグ用潤滑剤が提案されている。特許文献４に記載された潤滑剤は、質量％で、黒鉛、マイカ、ベントナイト、バーミキュライト、二硫化モリブデンおよび窒化硼素のうちから選ばれた１種または２種以上の粒子状の物質：１〜10％、水分散型または水溶性の高分子：１〜10％、酸化硼素、硼酸、アルカリ金属硼酸塩、炭酸ナトリウムおよび炭酸カリウムのうちから選ばれた１種または２種以上の無機結合剤：０〜15％を含み、残部が水からなる。特許文献４に記載された技術では、この潤滑剤を、スケール付けされたプラグの少なくとも先端部の表面に塗布して、表面に所定厚さの潤滑剤塗膜を形成させたプラグを使用して、継目無鋼管の穿孔圧延を行うとしている。これにより、先端部の溶損が防止でき、プラグ寿命が向上するとしている。 In response to such a demand, for example, Patent Document 4 proposes a lubricant for piercing-rolling plugs. The lubricant described in Patent Document 4 is, by mass%, one or more particulate substances selected from graphite, mica, bentonite, vermiculite, molybdenum disulfide and boron nitride: 1 to 10 %, Water-dispersed or water-soluble polymer: 1 to 10%, one or more inorganic binders selected from boron oxide, boric acid, alkali metal borates, sodium carbonate and potassium carbonate: 0 Contains ~ 15%, the balance consists of water. In the technique described in Patent Document 4, the lubricant is applied to at least the surface of the tip of the scaled plug, and a plug in which a lubricant film having a predetermined thickness is formed on the surface is used. , Piercing and rolling of seamless steel pipes. Thereby, melting of the tip can be prevented and the plug life is improved.
また、特許文献５には、穿孔圧延用工具表面保護材が提案されている。特許文献５に記載された表面保護材は、質量％で、10〜80％の酸化鉄、１〜60％の鉄粉、５〜40％のベントナイトまたはモンモリナイトからなる主骨材と、結合材と、繊維質構造材と、或いはさらに改質材とを含み、主骨材と改質材の合計が、20〜90％である、工具表面を覆い、工具表面を保護するハット形状の表面保護材である。 Patent Document 5 proposes a tool surface protective material for piercing and rolling. The surface protective material described in Patent Document 5 is 10% to 80% iron oxide, 1 to 60% iron powder, 5 to 40% bentonite or montmorite main aggregate, and a binder. A hat-shaped surface protective material that covers the tool surface and protects the tool surface, including a fibrous structural material and / or a modifying material, and the total of the main aggregate and the modifying material is 20 to 90% It is.
また、特許文献６には、穿孔圧延時の噛み込み性を悪化させることなく、内面品質の良好な継目無鋼管の製造方法が提案されている。特許文献６に記載された技術では、スケール付け熱処理済みのプラグに、表面スケール中のFeOとの共晶温度が1200℃以下のスケール溶融物質を塗布して、穿孔圧延に供するとしている。 Patent Document 6 proposes a method of manufacturing a seamless steel pipe with good inner surface quality without deteriorating the biting property during piercing and rolling. In the technique described in Patent Document 6, a scale molten material having a eutectic temperature of 1200 ° C. or less with FeO in the surface scale is applied to a plug that has been heat-treated for scale, and subjected to piercing and rolling.
しかしながら、特許文献４に記載された技術によっても、複数本の穿孔圧延を連続して行うと、プラグに焼付きが生じ、所望の連続圧延ができないという問題があった。また、特許文献５に記載された技術では、保護材の成型に多大の時間を要するうえ、穿孔圧延直前あるいは穿孔圧延中に、表面保護材が工具表面から脱落しやすいという問題があった。さらに、特許文献６に記載された技術では、早期にプラグに損傷が発生し、更なるプラグの長寿命化を達成できていないという問題がある。 However, even with the technique described in Patent Document 4, when a plurality of piercing and rolling operations are continuously performed, there is a problem that seizure occurs on the plug and the desired continuous rolling cannot be performed. In addition, the technique described in Patent Document 5 has a problem that it takes a lot of time to mold the protective material, and the surface protective material tends to drop off from the tool surface immediately before or during piercing and rolling. Furthermore, in the technique described in Patent Document 6, there is a problem in that the plug is damaged at an early stage and the life of the plug cannot be further increased.
本発明は、かかる従来技術の問題を有利に解決し、簡便に、プラグ等の穿孔圧延用工具の表面を保護でき、穿孔圧延用工具の寿命を更に長寿命化できる、継目無鋼管穿孔圧延用工具の使用方法を提供することを目的とする。 The present invention advantageously solves the problems of the prior art, can easily protect the surface of a piercing and rolling tool such as a plug, and can further extend the life of the piercing and rolling tool. It aims at providing the usage method of a tool.
本発明者らは、上記した目的を達成するために、穿孔圧延用工具（プラグ）の寿命に影響する各種要因について鋭意研究した。表面に酸化スケール被膜を形成された穿孔圧延用工具（プラグ）では、工具の寿命は、酸化スケール被膜の損耗速度に律速され、残存する酸化スケール被膜の有無に支配され、表面に形成された酸化スケール被膜が消滅した時点で焼付き、溶損が生じ、廃却される。 In order to achieve the above-mentioned object, the present inventors diligently studied various factors that affect the life of a piercing and rolling tool (plug). In piercing and rolling tools (plugs) with an oxide scale coating formed on the surface, the life of the tool is controlled by the wear rate of the oxide scale coating, and is controlled by the presence or absence of the remaining oxide scale coating. When the scale film disappears, it is seized and melted and discarded.
このようなことから、穿孔圧延用工具の長寿命化には、工具表面に予め形成された酸化スケール被膜を、適宜、補充することがよいことに思い至った。そして、酸化スケール被膜の簡便な補充方法として、特定組成の表面保護剤を塗布することが、有効であることに想到した。そして、そのような表面保護剤として、ウスタイト、マグネタイト等の酸化鉄粉と、低融点の化合物粉と、を溶剤に混合し、スラリー状にした溶液（穿孔圧延用工具表面保護剤）とすれば、簡便にしかも確実に、圧延用工具表面の酸化スケール被膜を補充することができることを見出した。 For these reasons, the inventors have come up with the idea that, in order to prolong the life of the piercing and rolling tool, it is preferable to appropriately replenish an oxide scale coating formed in advance on the tool surface. Then, the inventors have conceived that it is effective to apply a surface protective agent having a specific composition as a simple replenishment method of the oxide scale coating. And as such a surface protective agent, if iron oxide powders such as wustite and magnetite and low melting point compound powders are mixed in a solvent to form a slurry (tool surface protective agent for piercing and rolling) It was found that the oxide scale film on the surface of the rolling tool can be replenished simply and reliably.
そして、更なる検討によれば、上記した溶液を圧延用工具表面に塗布することにより、溶液中に含まれる低融点化合物の作用により、溶液中の酸化鉄粉が、工具表面の酸化スケール被膜と融合して酸化スケール被膜が補充され、さらに低融点化合物の潤滑作用により酸化スケール被膜が補強され、あるいはさらに酸化スケール被膜の損耗が抑制されて、工具の潤滑や断熱の低下が防止でき、穿孔圧延用工具の寿命延長が可能となることを知見した。 And according to the further examination, by applying the above-mentioned solution to the rolling tool surface, the iron oxide powder in the solution becomes an oxide scale film on the tool surface by the action of the low melting point compound contained in the solution. The oxide scale film is replenished by fusion, and the oxide scale film is reinforced by the lubricating action of the low melting point compound. Further, the wear of the oxide scale film is suppressed, and the lubrication of the tool and the decrease in heat insulation can be prevented. It was found that the tool life can be extended.
そして、このような溶液は、圧延用工具を直接、浸漬（いわゆるドブ漬け）することができ、圧延用工具を単に浸漬するだけで、表面保護剤を工具表面に塗布することができ、特別な乾燥、成型等の工程を必要とすることなく、圧延用工具を保護することができ、簡便で穿孔圧延の生産性向上に大きく寄与することを知見した。
本発明は、上記した知見に基づき、さらに検討を加えて完成されたものである。すなわち、本発明の要旨は次のとおりである。
（１）継目無鋼管の穿孔圧延に用いる圧延用工具の使用方法であって、未使用の前記圧延用工具にスケール付け熱処理を施したのち、該圧延用工具を、600〜1000℃の融点を有する低融点化合物粉を質量％で4〜40％含み、残部が酸化鉄粉からなる主剤と、硬化剤とを、水性溶剤またはアルコール性溶剤に混合し、スラリー状を呈する溶液とした表面保護剤中に浸漬して前記圧延用工具表面の少なくとも先端部に前記表面保護剤を塗布する塗布処理を施して、前記圧延用工具を穿孔圧延に供することを特徴とする継目無鋼管穿孔圧延用工具の使用方法。
（２）（１）において、前記穿孔圧延に複数回、供されたのちの前記圧延用工具にさらにスケール付けを行う再スケール付け熱処理を施し、ついで、該再スケール付け熱処理を施された前記圧延用工具に、該圧延用工具を前記スラリー状を呈する溶液とした表面保護剤中に浸漬して前記圧延用工具表面の少なくとも先端部に前記表面保護剤を塗布する塗布処理を施して、前記圧延用工具をさらに穿孔圧延に供する工程を１回または複数回繰り返すことを特徴とする継目無鋼管穿孔圧延用工具の使用方法。
（３）（１）または（２）において、前記穿孔圧延に供される間に、前記圧延用工具に、該圧延用工具を前記スラリー状を呈する溶液とした表面保護剤中に浸漬して前記圧延用工具表面の少なくとも先端部に前記表面保護剤を塗布する塗布処理を、前記穿孔圧延の１回ごとまたは複数回ごとに行うことを特徴とする継目無鋼管穿孔圧延用工具の使用方法。
（４）（１）において、前記スケール付け熱処理と前記塗布処理との間に、前記スケール付け熱処理済の前記圧延用工具を少なくとも１回の穿孔圧延に供することを特徴とする継目無鋼管穿孔圧延用工具の使用方法。
（５）（１）ないし（４）のいずれかにおいて、前記酸化鉄粉が、ウスタイト粉またはマグネタイト粉、あるいはそれらの混合粉を重量%で90％以上含有することを特徴とする継目無鋼管穿孔圧延用工具の使用方法。
（６）（１）ないし（５）のいずれかにおいて、前記低融点化合物粉が、Liと、Na、Si、Ba、Al、Ca、Ｋのうちから選ばれた１種以上を含むことを特徴とする継目無鋼管穿孔圧延用工具の使用方法。
（７）（５）において、前記酸化鉄粉が、質量％で10％以下の鉄粉および／またはFe2O3粉を含むことを特徴とする継目無鋼管穿孔圧延用工具の使用方法。
Such a solution can directly immerse the rolling tool (so-called soaking), and can apply a surface protective agent to the tool surface simply by immersing the rolling tool. It has been found that the rolling tool can be protected without requiring steps such as drying and molding, and it is simple and greatly contributes to the improvement of the productivity of piercing and rolling.
The present invention has been completed based on the above findings and further studies. That is, the gist of the present invention is as follows.
(1) A method of using a rolling tool used for piercing and rolling of seamless steel pipes, and after applying heat treatment to scale the unused rolling tool, the rolling tool has a melting point of 600 to 1000 ° C. 4-40% saw including a low melting point compound powder mass% having a main agent and the balance being iron oxide powder, and a curing agent, mixed in an aqueous solvent or an alcoholic solvent, a surface protection a solution exhibiting a slurry A seamless steel pipe piercing and rolling tool characterized in that the rolling tool is subjected to piercing and rolling by applying a coating treatment in which the surface protecting agent is applied to at least a tip portion of the rolling tool surface by being immersed in an agent. How to use.
(2) In (1), the rolling tool that has been subjected to the piercing and rolling a plurality of times and further subjected to rescaling heat treatment for further scaling is performed, and then the rescaled heat treatment is performed. The rolling tool is subjected to a coating treatment by immersing the rolling tool in a surface protective agent in the form of a slurry-like solution and applying the surface protective agent to at least the tip of the rolling tool surface. A method of using a seamless steel pipe piercing and rolling tool, wherein the step of subjecting the tool to further piercing and rolling is repeated once or a plurality of times.
(3) In (1) or (2), while being subjected to the piercing-rolling, the rolling tool is immersed in a surface protective agent in the form of a slurry-like solution. A method for using a seamless steel pipe piercing and rolling tool, wherein the coating treatment for applying the surface protective agent to at least the tip of the rolling tool surface is performed every time or a plurality of times of the piercing and rolling.
(4) The seamless steel pipe piercing and rolling characterized in that, in (1), the scaled and heat-treated rolling tool is subjected to at least one piercing and rolling between the scaling heat treatment and the coating treatment. How to use the tool.
(5) In any one of (1) to (4), the iron oxide powder contains 90% or more by weight percent of wustite powder, magnetite powder, or a mixed powder thereof. How to use rolling tools.
In any one of (6) (1) to (5), wherein the low melting point compound powder, and Li, Na, Si, Ba, Al, Ca, and including that one or more selected from among K A method of using the featured seamless steel pipe piercing and rolling tool.
(7) The method for using a seamless steel pipe piercing and rolling tool according to (5), wherein the iron oxide powder contains 10% or less by mass of iron powder and / or Fe 2 O 3 powder.
本発明によれば、穿孔圧延前に、スケール付け処理に加えてさらに、穿孔圧延用工具を特定な組成を有するスラリー状を呈する表面保護剤中に浸漬し、該圧延用工具表面に表面保護剤を塗布するという簡便な塗布処理だけで、穿孔圧延用工具の寿命が格段に向上し、産業上格段の効果を奏する。また、本発明によれば、ハケ塗り等の特別な塗布作業を行う必要がなく、また乾燥等の付加処理を行う必要がなく、高Cr鋼製継目無鋼管の生産性向上に大きく寄与し、製造コストを低減することができるという効果もある。また、本発明によれば、プラグ表面を滑らかにでき、管内面疵の発生を抑制できるという効果もある。 According to the present invention, prior to piercing and rolling, in addition to the scaling treatment, the piercing and rolling tool is further immersed in a surface protective agent having a specific composition, and the surface protective agent is applied to the surface of the rolling tool. The service life of the piercing and rolling tool is significantly improved by a simple coating process of coating the film, and the industrially significant effect is achieved. Further, according to the present invention, it is not necessary to perform a special coating operation such as brush coating, and it is not necessary to perform additional processing such as drying, which greatly contributes to the productivity improvement of the high Cr steel seamless steel pipe, There is also an effect that the manufacturing cost can be reduced. In addition, according to the present invention, the plug surface can be smoothed, and there is an effect that generation of tube inner surface flaws can be suppressed.
本発明は、継目無鋼管製造における穿孔圧延に用いる圧延用工具の使用方法である。
本発明では、未使用の穿孔圧延用工具に、まず、スケール付け熱処理を施す。なお、使用する穿孔圧延用工具としては、通常、質量％で、Ｃ：0.1〜0.5％、Si：0.1〜1.0％、Mn：0.1〜1.0％、Ni：0.5〜3.0％、Cr：0.1〜1.0％、Mo：0.1〜3.0％、を含み、その他、Co、Nb、Ｖ、Ｗ等を適宜含有し、残部がFeおよび不可避的不純物から組成の鋳造品が使用されている。本発明で使用する穿孔圧延用工具は、上記した組成に限定されないことは言うまでもない。
The present invention is a method of using a rolling tool used for piercing and rolling in the production of seamless steel pipes.
In the present invention, an unused piercing and rolling tool is first subjected to a scaling heat treatment. In addition, as a piercing-rolling tool to be used, normally, in mass%, C: 0.1 to 0.5%, Si: 0.1 to 1.0%, Mn: 0.1 to 1.0%, Ni: 0.5 to 3.0%, Cr: 0.1 to 1.0 %, Mo: 0.1-3.0%, Co, Nb, V, W, etc. are contained as appropriate, and the balance is Fe and inevitable impurities. Needless to say, the piercing and rolling tool used in the present invention is not limited to the above composition.
本発明で用いるスケール付け熱処理は、工具表面に酸化スケール被膜を形成させればよく、とくに限定されるものでないが、未使用の圧延用工具に、酸化雰囲気中で、900℃以上の温度に加熱保持したのち、500℃以下まで30℃/h以下の冷却速度で冷却し、その後、放冷する処理とすることが好ましい。上記した熱処理では、使用する炉を限定する必要はないが、電気炉、あるいはガス燃焼炉等を用いることが温度制御の観点から好ましい。 The scaling heat treatment used in the present invention is not particularly limited as long as an oxide scale film is formed on the tool surface. However, an unused rolling tool is heated to a temperature of 900 ° C. or higher in an oxidizing atmosphere. After the holding, it is preferable that the cooling is performed at a cooling rate of 30 ° C./h or lower to 500 ° C. or lower and then allowed to cool. In the above heat treatment, it is not necessary to limit the furnace to be used, but it is preferable to use an electric furnace or a gas combustion furnace from the viewpoint of temperature control.
上記した熱処理により、圧延用工具表面には、0.5〜2mm厚の酸化鉄層（スケール層）が形成される。
圧延用工具表層にスケール層を形成することにより、スケール層の持つ断熱性、潤滑性により、圧延用工具本体の損傷を多少でも抑制でき、工具寿命の延長が可能となる。しかし、圧延用工具表面のスケール層が損耗すると、図１に示すように、圧延用工具の変形、焼付きあるいはエグレ疵などが発生し、圧延用工具は廃却されることになる。
By the heat treatment described above, an iron oxide layer (scale layer) having a thickness of 0.5 to 2 mm is formed on the surface of the rolling tool.
By forming the scale layer on the surface layer of the rolling tool, damage to the rolling tool body can be suppressed to some extent due to the heat insulation and lubricity of the scale layer, and the tool life can be extended. However, when the scale layer on the surface of the rolling tool is worn out, as shown in FIG. 1, the rolling tool is deformed, seized, or glazed, and the rolling tool is discarded.
このため、本発明では、スケール付け熱処理後に、圧延用工具表面に表面保護剤を塗布して、圧延用工具表面のスケール層を補充、補強する。本発明では、表面保護剤の塗布は、圧延用工具をスラリー状を呈する表面保護剤中に浸漬（いわゆるドブ漬け）し、圧延用工具表面に表面保護剤を塗布する塗布処理とする。これにより、塗布処理後の圧延用工具を、とくに乾燥する必要もなくなり、塗布処理が簡便になり、生産性が向上する。なお、ドブ漬けを行うに際し、工具を回転させながら浸漬することが好ましい。工具を回転させることにより、保護剤の塗布が均一となる。また、浸漬に際しての工具と保護剤との角度はとくに限定されない。ドブ漬けを行うに際しては特別な粘性の調整は必要としない。ハケ塗りやスプレー塗りのような粘性調整が難しい塗布処理を行う必要はない。 For this reason, in the present invention, after the heat treatment for scaling, a surface protective agent is applied to the surface of the rolling tool to supplement and reinforce the scale layer on the surface of the rolling tool. In the present invention, the surface protective agent is applied by dipping the rolling tool in a slurry-like surface protective agent (so-called dipping) and applying the surface protective agent to the surface of the rolling tool. As a result, it is not necessary to dry the rolling tool after the coating process, the coating process is simplified, and the productivity is improved. In addition, it is preferable to immerse while rotating a tool when performing dobbing. By rotating the tool, the protective agent is uniformly applied. The angle between the tool and the protective agent during immersion is not particularly limited. No special viscosity adjustment is required for pickling. There is no need to perform application processing such as brush coating or spray coating, which is difficult to adjust the viscosity.
本発明で使用する表面保護剤では、特別な粘性調整を必要としない。粘度が高くなったと判断した場合には、溶剤を適量添加するだけでよい。溶剤の添加量は精度よく調整する必要はない。なお、表面保護剤は、粘性の低下、均一性を保持するために、撹拌機等で適時撹拌しておくことが好ましい。
なお、表面保護剤の塗布は、少なくとも先端部、すなわち穿孔圧延用工具の先端から工具長さの1/3以上の領域とすることが好ましい。というのは、穿孔圧延用工具の先端部がとくに、厳しい環境に晒されるためである。また、表面保護剤の塗布量は、工具と被圧延材とが接触する領域が覆われていればよく、その量はとくに限定されないが、工具表面を十分に覆うという観点から塗布厚さで0.5〜2mmとすることが好ましい。
The surface protective agent used in the present invention does not require any special viscosity adjustment. When it is determined that the viscosity has increased, it is only necessary to add an appropriate amount of solvent. It is not necessary to adjust the addition amount of the solvent with high accuracy. The surface protective agent is preferably stirred with a stirrer or the like in a timely manner in order to maintain viscosity reduction and uniformity.
The surface protective agent is preferably applied at least at the tip portion, that is, in the region of 1/3 or more of the tool length from the tip of the piercing and rolling tool. This is because the tip of the piercing and rolling tool is exposed to a particularly severe environment. Further, the coating amount of the surface protective agent is not particularly limited as long as the region where the tool and the material to be rolled are in contact with each other is coated, but the coating thickness is 0.5 from the viewpoint of sufficiently covering the tool surface. It is preferable to be set to ~ 2 mm.
このような塗布処理が可能となる表面保護剤として、本発明では、溶剤に主剤と硬化剤とを混合した、スラリー状を呈する表面保護剤を使用する。本発明で使用する好ましい表面保護剤は、主剤が酸化鉄粉を主体とし、主剤全量に対する質量％で４〜40％の低融点化合物粉を含む。
主剤の主体である酸化鉄粉は、ウスタイト（FeO）粉またはマグネタイト（Fe３O４）粉、あるいはそれらの混合粉とすることが好ましい。なお、酸化鉄粉の平均粒径は、15μm以下とすることが、分散性の観点から好ましい。なお、酸化鉄粉全量に対する質量％で10％以下であれば、Fe粉、Fe２O３粉を含有してもよい。
In the present invention, a surface protective agent having a slurry shape in which a main agent and a curing agent are mixed in a solvent is used as a surface protective agent capable of such coating treatment. In the preferred surface protective agent used in the present invention, the main component is mainly composed of iron oxide powder, and contains 4 to 40% of low melting point compound powder in mass% based on the total amount of the main agent.
The iron oxide powder that is the main ingredient is preferably wustite (FeO) powder, magnetite (Fe 3 O 4 ) powder, or a mixed powder thereof. The average particle diameter of the iron oxide powder is preferably 15 μm or less from the viewpoint of dispersibility. Incidentally, if 10% or less by mass% with respect to iron oxide powder total amount, Fe powder may contain Fe 2 O 3 powder.
また、主剤に含まれる「低融点化合物粉」は、600〜1000℃の範囲の融点を有する低融点化合物を主体とする粉末とする。例えば、低融点化合物としては、Liと、さらにNa、Si、Ba、Al、Ca、Ｋのうちの１種以上を含む化合物が例示でき、具体的には、低融点化合物粉は、ガラス類、鋳造用フラックスを粉粒体化したもの、あるいは、Li化合物とNa、Si、Ba、Al、Ca、Ｋのうちの１種以上を含む炭酸塩や自然石等あるいは化合物を１回以上溶融（プリメルト）し、混合あるいは融合させたのち、粉砕したものを用いてもよい。プリメルト品としては、例えば遠心鋳造用フラックスとして利用されているものが好適である。遠心鋳造用フラックスでは、例えば、SiO２、CaO、Na２O、Li２O、Al２O３、あるいはさらにMnO、MgOを含有する。なお、低融点化合物としてＣ，Ｂを含む物質を用いると、鋼管内面の脆化を引き起こすため、注意が必要となる。なお、プリメルト品以外の化合物を用いると、軟化温度の不均一やガス発生量が多くなるという問題が生じる。
なお、主剤に含有する低融点化合物粉は、−180メッシュとすることが好ましい。粒径が180メッシュより大きくなると、工具の表面に予め形成されたスケールとの融合が不十分となる。このため、使用する低融点化合物粉の粒径を、−180メッシュに限定することが好ましい。
The “low melting point compound powder” contained in the main agent is a powder mainly composed of a low melting point compound having a melting point in the range of 600 to 1000 ° C. For example, examples of the low melting point compound include Li and a compound containing at least one of Na, Si, Ba, Al, Ca, and K. Specifically, the low melting point compound powder includes glass, Casting flux or powder, or carbonate or natural stone containing Li compound and one or more of Na, Si, Ba, Al, Ca and K ), Mixed or fused, and then pulverized. As the premelt product, for example, those used as a centrifugal casting flux are suitable. The centrifugal casting flux contains, for example, SiO 2 , CaO, Na 2 O, Li 2 O, Al 2 O 3 , or further MnO and MgO. Note that when a substance containing C or B is used as the low melting point compound, it causes embrittlement of the inner surface of the steel pipe, so care must be taken. When a compound other than the premelt product is used, problems such as uneven softening temperature and increased gas generation occur.
The low melting point compound powder contained in the main agent is preferably -180 mesh. When the particle size is larger than 180 mesh, the fusion with the scale formed in advance on the surface of the tool becomes insufficient. For this reason, it is preferable to limit the particle size of the low melting point compound powder used to -180 mesh.
主剤として、酸化鉄粉に低融点化合物を混合することにより、穿孔圧延用工具の表面に予め形成されたスケールとの融合が助長され、さらに表面保護剤の潤滑効果を増加させることができる。このような効果は、４％以上の低融点化合物の含有で顕著となる。一方、40％を超えて多量に含有しても、効果が飽和し、さらに、酸化スケール、酸化鉄が低融点し、表面保護作用が低下する。このようなことから、主剤中における低融点化合物の含有量は４〜40％の範囲に限定した。 By mixing the low melting point compound in the iron oxide powder as the main agent, the fusion with the scale previously formed on the surface of the piercing and rolling tool is promoted, and the lubricating effect of the surface protective agent can be further increased. Such an effect becomes remarkable when the content of the low melting point compound is 4% or more. On the other hand, even if it is contained in a large amount exceeding 40%, the effect is saturated, and furthermore, the oxide scale and iron oxide have a low melting point, and the surface protecting action is lowered. For this reason, the content of the low melting point compound in the main agent is limited to the range of 4 to 40%.
また、溶剤は、水等の水性溶剤またはアルコール等のアルコール性溶剤とする。主剤と硬化剤とをそれぞれ溶剤に混合し、スラリー状とする。なお、表面保護剤の比重が、60〜95ボーメ度（°B’e）となるように、主剤100質量部に対し、溶剤：20〜90質量部を、配合する。これにより、工具を表面保護剤に浸漬（ドブ漬け）しても、表面保護剤を、穿孔圧延用工具の表面に、容易に塗布することができるようになる。なお、表面保護剤の粘度調整は、溶剤の適当量添加で十分に行える。 The solvent is an aqueous solvent such as water or an alcoholic solvent such as alcohol. The main agent and the curing agent are mixed in a solvent to form a slurry. In addition, solvent: 20-90 mass parts is mix | blended with respect to 100 mass parts of main agents so that the specific gravity of a surface protection agent may be 60-95 Baume degree ((degree B'e)). Thereby, even if a tool is immersed in a surface protective agent (dipping), the surface protective agent can be easily applied to the surface of the piercing and rolling tool. The viscosity of the surface protective agent can be adjusted sufficiently by adding an appropriate amount of solvent.
また、表面保護剤中には硬化剤を含有させるが、硬化剤は、スラリー状の保護剤中の主剤を工具表面に安定に固定させるために、含有させる。その含有量は、主剤100質量部に対する質量部で、2〜20質量部とすることが好ましい。２質量部未満では、表面保護剤の強度が低下する。一方、20質量部を超える多量の含有は、付着した表面保護剤に亀裂が発生しやすくなる。 Moreover, although a hardening | curing agent is contained in a surface protective agent, a hardening | curing agent is contained in order to fix the main ingredient in a slurry-like protective agent to the tool surface stably. The content is preferably 2 to 20 parts by mass with respect to 100 parts by mass of the main agent. If it is less than 2 parts by mass, the strength of the surface protective agent is lowered. On the other hand, when the content exceeds 20 parts by mass, the attached surface protective agent is liable to crack.
硬化剤としては、水溶性のものとしては、アクリル系樹脂、酢酸ビニル樹脂、エチレン酢酸系樹脂、スチレン系樹脂、粘土、水ガラス等が、溶剤系のものとして、ポリエチレン系樹脂、エステル系樹脂、ウレタン系樹脂、エポキシ系樹脂、アルキド系樹脂、ゴム等が、熱硬化性樹脂としては、フェノール樹脂、尿素系樹脂、メラミン系樹脂等が例示される。また、炭素繊維、ガラス繊維で強化された強化型樹脂、含油系樹脂等を用いても何ら問題ない。 As the curing agent, water-soluble acrylic resins, vinyl acetate resins, ethylene acetate resins, styrene resins, clay, water glass, etc., solvent-based ones such as polyethylene resins, ester resins, Examples of the thermosetting resin include a urethane resin, an epoxy resin, an alkyd resin, and rubber, and examples of the thermosetting resin include a phenol resin, a urea resin, and a melamine resin. Further, there is no problem even if a reinforced resin reinforced with carbon fiber or glass fiber, an oil-containing resin, or the like is used.
スラリーを安定的に塗布するために、表面保護剤には、溶剤と、上記した主剤、硬化剤、に加えて、さらに、界面活性剤、消泡剤、防腐剤、増粘剤等を適宜、含有することが好ましい。
なお、上記した表面保護剤を用いれば、塗布処理された圧延用工具を、ぬれたままあるいは生乾きのままとしてもよく、塗布後の乾燥はとくに必要としないため、特別な乾燥をすることなく、穿孔圧延を施してもなんら問題はない。
In order to stably apply the slurry, in addition to the solvent and the main agent and curing agent described above, the surfactant, antifoaming agent, preservative, thickener and the like are appropriately added to the surface protective agent. It is preferable to contain.
If the above-mentioned surface protective agent is used, the coated rolling tool may be left wet or freshly dried, and since there is no particular need for drying after coating, without special drying, There is no problem with piercing and rolling.
また、スケール付け熱処理を施したのち、表面保護剤の塗布処理の前に、少なくとも１回の穿孔圧延を行ってもよい。
上記したスケール付け熱処理を施され、さらに塗布処理により表面に表面保護剤を塗布された圧延用工具は、ついで、複数回の穿孔圧延に供される。本発明では、複数回の穿孔圧延を行ったのち、好ましくは圧延用工具の表面状態を目視で判定して必要に応じ、穿孔圧延に供された圧延用工具にさらに再度、スケール付けを行う再スケール付け熱処理を施す。
In addition, after the heat treatment with scale, at least one piercing and rolling may be performed before the surface protective agent coating treatment.
The rolling tool that has been subjected to the above-described heat treatment for scaling and further coated with a surface protective agent by a coating treatment is then subjected to piercing and rolling a plurality of times. In the present invention, after performing piercing and rolling a plurality of times, preferably the surface condition of the rolling tool is visually determined, and if necessary, the rolling tool subjected to piercing and rolling is further scaled again. Apply heat treatment with scale.
再スケール付け熱処理は、酸化スケール被膜を表面に形成できれば、その条件をとくに限定する必要はない。未使用の圧延用工具に初めてスケールを付与するスケール付け熱処理と同じとしてもよい。
再スケール付け熱処理を施された圧延用工具は、該圧延用工具を表面保護剤中に浸漬（ドブ漬け）して圧延用工具表面の少なくとも先端部に前記表面保護剤を塗布する塗布処理を施されたのち、さらに複数回の穿孔圧延に供される。なお、塗布処理は、上記したスケール付け熱処理後と同様に、上記した組成の表面保護剤中に圧延用工具を浸漬（ドブ漬け）して、圧延用工具表面に表面保護剤を塗布する処理とする。
If the rescaled heat treatment can form an oxide scale film on the surface, it is not necessary to limit the conditions. It may be the same as the heat treatment for scaling that gives scale to an unused rolling tool for the first time.
The rolling tool that has been subjected to the rescaling heat treatment is subjected to a coating process in which the rolling tool is dipped in a surface protective agent (dipped) and the surface protective agent is applied to at least the tip of the rolling tool surface. Then, it is further subjected to piercing and rolling a plurality of times. In addition, the coating process is a process of immersing the rolling tool in the surface protective agent having the above-described composition (dobbing) and applying the surface protective agent to the surface of the rolling tool in the same manner as the above-described heat treatment with scaling. To do.
本発明では、このような再スケール付け熱処理と、表面保護剤の塗布処理と、複数回の穿孔圧延とからなる工程を複数回繰り返すことが好ましい。というのは、穿孔圧延に供された圧延用工具では表面のスケール層が損耗し、スケール層が薄くなるが、スケール層が消失する前に、再スケール付け熱処理と塗布処理とを施すことにより、表面に形成されるスケール層が補充、補強されて圧延用工具の損傷が抑制され、工具寿命を延長することができる。このため、再スケール付け熱処理と塗布処理とを繰り返すことにより、複数回の穿孔圧延を複数回、繰り返すことができることになる。なお、穿孔圧延に供された圧延用工具に再スケール付け熱処理を施す時期は、穿孔圧延に供された圧延用工具の表面状態を目視で判定して決定することが製品品質の確保の観点から、好ましい。 In the present invention, it is preferable to repeat a process consisting of such a rescaling heat treatment, a surface protective agent coating process, and a plurality of piercing-rolling processes a plurality of times. This is because the scale layer on the surface is worn out by the rolling tool used for piercing and rolling, and the scale layer becomes thin, but before the scale layer disappears, by performing re-scaling heat treatment and coating treatment, The scale layer formed on the surface is supplemented and reinforced, so that damage to the rolling tool can be suppressed and the tool life can be extended. For this reason, by repeating the rescaling heat treatment and the coating treatment, a plurality of piercing and rolling can be repeated a plurality of times. In addition, from the viewpoint of ensuring product quality, the timing for performing the rescaling heat treatment on the rolling tool subjected to piercing and rolling is determined by visually determining the surface state of the rolling tool subjected to piercing and rolling. ,preferable.
また、本発明では、圧延用工具が複数回の穿孔圧延に供される間に、圧延用工具に、上記した塗布処理と同様の塗布処理を、穿孔圧延の１回ごとまたは複数回ごとに行うことが好ましい。これにより、工具表面にスケール付け熱処理および／または再スケール付け熱処理で形成されたスケール層の損耗が激しくなる前に、すなわち、穿孔圧延を１回または複数回行った後に、スケール層を更に補充、補強することができ、圧延用工具の損耗が抑制されて、工具寿命をさらに延長できる。 Further, in the present invention, while the rolling tool is subjected to piercing and rolling a plurality of times, the rolling tool is subjected to the same coating treatment as the above-described coating treatment for each piercing and rolling every time or a plurality of times. It is preferable. Thereby, before the wear of the scale layer formed by the scale heat treatment and / or the rescale heat treatment on the tool surface becomes serious, that is, after the piercing and rolling are performed once or a plurality of times, the scale layer is further replenished. It can reinforce, the wear of the rolling tool is suppressed, and the tool life can be further extended.
このような処理を、複数回、繰り返したのち、圧延用工具は、変形、焼付き、えぐれ等が発生する寿命まで使い切る。
これにより、スケール付け処理のみを施して、変形、焼付き、えぐれ等が発生する寿命まで使い切る場合より、圧延用工具の長寿命化を簡便に、達成できる。この状況を図２に示す。
After repeating such a process a plurality of times, the rolling tool is used up to the end of its life in which deformation, seizure, erosion, etc. occur.
Thereby, it is possible to easily achieve a longer life of the rolling tool than when only the scaling process is performed and the life until deformation, seizure, erosion, etc. occurs is used up. This situation is shown in FIG.
表１に示す組成のプラグ（穿孔圧延用工具：未使用）に、まず、図３（ａ）に示すスケール付け熱処理を施し、厚さ：500〜1000μmのスケールをプラグ表面に形成した。そして、スケール付け熱処理を施されたプラグ（大きさ：140mmφ×350mm長さ）を、表２に示す組成のスラリー状を呈する表面保護剤中に、プラグの先端から約2/5〜1/2の領域を浸漬（ドブ漬け）して、プラグ表面に表面保護剤を塗布した。なお、主剤には、表３に示す「低融点化合物粉」を配合した。 A plug having the composition shown in Table 1 (piercing and rolling tool: unused) was first subjected to a heat treatment with a scale shown in FIG. 3A to form a scale having a thickness of 500 to 1000 μm on the plug surface. Then, the scale-treated heat-treated plug (size: 140 mmφ × 350 mm length) is about 2/5 to 1/2 from the tip of the plug in a surface protective agent having a slurry form having the composition shown in Table 2. The surface area was immersed (dobbed) and a surface protective agent was applied to the plug surface. The main agent was blended with “low melting point compound powder” shown in Table 3.
浸漬後、表面保護剤が濡れたままあるいは生乾きのまま、穿孔圧延の１〜３回ごとに塗布プラグを４〜６回（複数回）の穿孔圧延に供した。穿孔圧延は、13Cr系鋼ビレットの穿孔圧延とした。なお、ビレットの温度は1200〜1260℃であった。
穿孔圧延に際して、各穿孔圧延後に、プラグ表面状況を目視し、穿孔圧延の１〜３回ごとに、必要に応じて上記したと同様の塗布処理を施した。そして、４〜６回（複数回）の穿孔圧延を終了した後に、図３（ｂ）に示す再スケール付け熱処理を施し、厚さ：500〜1000μmのスケールをプラグ表面に形成した。
After the immersion, the coated plug was subjected to piercing and rolling 4 to 6 times (multiple times) every 1 to 3 times of piercing and rolling while the surface protective agent was wet or dried. The piercing and rolling was piercing and rolling of 13Cr steel billets. The billet temperature was 1200 to 1260 ° C.
During piercing and rolling, the plug surface condition was visually observed after each piercing and rolling, and the same coating treatment as described above was performed as needed every 1 to 3 times of piercing and rolling. Then, after finishing the piercing and rolling 4 to 6 times (a plurality of times), the rescaled heat treatment shown in FIG. 3B was performed to form a scale having a thickness of 500 to 1000 μm on the plug surface.
再スケール付け熱処理を施されたプラグは、スケール付け熱処理後と同様に、表２に示す組成のスラリー状を呈する表面保護剤中に、プラグの先端から約2/5〜5/6の領域を浸漬（ドブ漬け）して、プラグ表面に表面保護剤を塗布した。浸漬後、表面保護剤が濡れたままあるいは生乾きのままで、さらにプラグを４〜６回（複数回）の穿孔圧延に供するという要領で圧延を繰返した。また、穿孔圧延に際しては同様に、各穿孔圧延後に、プラグ表面状況を目視し、穿孔圧延の１〜３回ごとに、必要に応じて上記したと同様の塗布処理を施した。そして、４〜６回の穿孔圧延を終了した後に、再スケール付け熱処理を施した。再スケール付け熱処理後に、同様にさらに穿孔圧延に供した。 The plug subjected to the rescaling heat treatment has a region of about 2/5 to 5/6 from the tip of the plug in the surface protective agent having a slurry form having the composition shown in Table 2 in the same manner as after the scale heat treatment. The surface protective agent was applied to the plug surface by dipping. After dipping, the rolling was repeated in such a manner that the surface protective agent was wet or freshly dried, and the plug was further subjected to piercing and rolling 4-6 times (multiple times). Similarly, during piercing and rolling, the plug surface condition was visually observed after each piercing and rolling, and the same coating treatment as described above was performed every 1 to 3 times of piercing and rolling. And after finishing the piercing-rolling of 4-6 times, the rescaled heat processing was performed. After the rescaling heat treatment, it was also subjected to further piercing and rolling.
このような工程を、焼付き、溶損や変形、大きなえぐれが発生し、プラグ廃却となるまで繰り返し、それまでの合計穿孔本数（穿孔圧延回数）を求めた。なお、同一条件での繰り返し数を４（N=４）として、その平均を、その条件でのプラグ使用における、プラグ寿命とした。プラグ寿命が８本以下である場合を×、８本超え〜16本未満を△、16本以上を○、として評価した。 Such a process was repeated until seizure, melting damage, deformation, and large erosion occurred, and the plug was discarded, and the total number of piercings (number of piercing and rolling) was determined. The number of repetitions under the same conditions was 4 (N = 4), and the average was taken as the plug life when the plug was used under those conditions. The case where the plug life was 8 or less was evaluated as x, 8 to less than 16 was evaluated as Δ, and 16 or more was evaluated as ○.
なお、従来例として、スケール付け熱処理を施したのち、表面保護剤を塗布することなく、変形、焼付き等の欠陥が発生し、廃却されるまで（寿命まで）、穿孔圧延に供した。
得られた結果を表４に示す。
In addition, as a conventional example, after performing the heat treatment with scaling, it was subjected to piercing and rolling until defects such as deformation and seizure occurred and were discarded (until the lifetime) without applying a surface protective agent.
Table 4 shows the obtained results.
表面保護剤中にドブ漬けして表面に表面保護剤を塗布して穿孔圧延に供されたプラグ（本発明例）は、いずれも、プラグ寿命は15本以上となっており、従来例の3.5本に比べて、約３倍以上の、長寿命化が達成できている。一方、本発明の好ましい範囲を外れた表面保護剤で塗布されたプラグは、従来より若干長いプラグ寿命を確保できているが、15本以上の所望の長寿命を達成できていない。 All plugs (examples of the present invention) that were immersed in the surface protective agent and applied to the surface and subjected to piercing and rolling had a plug life of 15 or more. Compared to the book, it has achieved a lifespan that is about three times or more. On the other hand, a plug coated with a surface protecting agent outside the preferred range of the present invention can ensure a slightly longer plug life than the conventional one, but cannot achieve a desired long life of 15 or more.
Claims (7)
スケール付け熱処理を施し、ついで、該再スケール付け熱処理を施された前記圧延用工具
に、該圧延用工具を前記スラリー状を呈する溶液とした表面保護剤中に浸漬して前記圧延
用工具表面の少なくとも先端部に前記表面保護剤を塗布する塗布処理を施して、前記圧延
用工具をさらに穿孔圧延に供する工程を１回または複数回繰り返すことを特徴とする請求
項１に記載の継目無鋼管穿孔圧延用工具の使用方法。 The rolling tool that has been subjected to the piercing and rolling a plurality of times is subjected to a rescaling heat treatment for further scaling, and then the rolling tool subjected to the rescaling heat treatment is subjected to the rolling tool. Is applied to the rolling tool surface by applying the surface protecting agent to at least the tip portion of the rolling tool surface, and the rolling tool is further subjected to piercing and rolling. The method of using a seamless steel pipe piercing and rolling tool according to claim 1, wherein the process is repeated once or a plurality of times.
する溶液とした表面保護剤中に浸漬して前記圧延用工具表面の少なくとも先端部に前記表
面保護剤を塗布する塗布処理を、前記穿孔圧延の１回ごとまたは複数回ごとに行うことを
特徴とする請求項１または２に記載の継目無鋼管穿孔圧延用工具の使用方法。 While being subjected to the piercing and rolling, the surface of the rolling tool is dipped in a surface protective agent in the form of a slurry to immerse the rolling tool in at least the tip portion of the surface of the rolling tool. The method for using the seamless steel pipe piercing and rolling tool according to claim 1 or 2, wherein the coating treatment for applying the agent is performed once or plural times of the piercing and rolling.
延用工具で少なくとも１回の穿孔圧延を行うことを特徴とする請求項１に記載の継目無鋼
管穿孔圧延用工具の使用方法。 2. The seamless steel pipe piercing and rolling tool according to claim 1, wherein the piercing and rolling is performed at least once with the scaled and heat-treated rolling tool between the scale heat treatment and the coating treatment. How to use.
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