JP6015269B2 - Manufacturing method of high Cr seamless steel pipe - Google Patents
Manufacturing method of high Cr seamless steel pipe Download PDFInfo
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Description
本発明は、高Cr継目無鋼管の製造方法に関し、詳しくは、Crを12質量%以上含有する継目無鋼管である高Cr継目無鋼管の製造方法に関する。 The present invention relates to a method for producing a high Cr seamless steel pipe, and more particularly to a method for producing a high Cr seamless steel pipe which is a seamless steel pipe containing 12 mass% or more of Cr.
継目無鋼管は、一般に、連続鋳造機で大断面角形状のブルーム鋳片を鋳造し、加熱後、分塊圧延機、ブルーミングミルおよびビレッティングミル等で熱間圧延して断面丸形状のビレットすなわち丸ビレットとなし、あるいは、連続鋳造機で丸ビレットを鋳造し、これらの丸ビレットを素形態とする被加工材に用い、製管工場にて前記被加工材に、穿孔圧延、およびこれに後続する延伸圧延、さらに定径圧延等を施すことにより製造される。 A seamless steel pipe is generally a billet having a round cross section, which is obtained by casting a bloom slab having a large cross section with a continuous caster, hot rolling with a lump mill, blooming mill, billeting mill, etc. Without or without round billets, or round billets are cast with a continuous casting machine, and these round billets are used as workpieces, and the workpieces are pierced and rolled, followed by this It is manufactured by subjecting it to stretching rolling and constant diameter rolling.
製管工場における継目無鋼管用の一般的な圧延設備列としては、図2に示す従来例が挙げられる。
従来例の圧延設備列は、図2に示される様に、丸ビレット10を高温(1100〜1300℃程度)に加熱する第1加熱を行う回転炉1等の第1加熱炉と、次いで前記加熱後の丸ビレット10を穿孔用バーにて穿孔して管体11となすバー穿孔型のピアサー2と、次いで前記穿孔してなる管体11に、マンドレルバーによる管内面拘束下で全1段階の延伸圧延を施す一群の圧延機からなるマンドレルミル3と、次いで前記延伸圧延後の管体11を再加熱(900〜1100℃程度)する再加熱炉4と、次いで前記再加熱後の管体11を定径圧延する一群の圧延機からなるレデューサーミル5とを有する。
As a general rolling equipment line for seamless steel pipes in a pipe factory, a conventional example shown in FIG.
As shown in FIG. 2, the conventional rolling equipment row includes a first heating furnace such as a rotary furnace 1 that performs the first heating for heating the
尚、前記定径圧延後の管体11は、必要に応じて所定長さに切断後、クーリングベッド6へ搬送され、冷却される。
継目無鋼管の品質向上に関して、特許文献1には、中空素管(前記管体11に該当)の内面をプラグで拘束しつつ延伸圧延する時の材料温度(加工温度)が長手方向に不均一となり、そのため製品の長手方向品質ばらつきが大きくなるのを抑制するために、素形態が丸ビレットである被加工材を、加熱した後、穿孔圧延して中空素管となし、引き続き前記中空素管の内面をプラグで拘束しつつ延伸圧延し、次いで再加熱した後、定径圧延し、次いで冷却して継目無鋼管となす継目無鋼管の製造方法において、前記被加工材の延伸圧延前に、該延伸圧延(エロンゲータ圧延→プラグミル圧延→リーラー圧延の各々)の直前の被加工材の長手方向の先端が後端よりも30〜400℃高い温度となるように、(誘導加熱にて)加熱する旨記載されている。
The
Regarding the quality improvement of the seamless steel pipe, Patent Document 1 discloses that the material temperature (processing temperature) when the inner surface of the hollow shell (corresponding to the tubular body 11) is stretched and rolled while being constrained with a plug is not uniform in the longitudinal direction. Therefore, in order to suppress an increase in the longitudinal quality variation of the product, a workpiece whose raw form is a round billet is heated, then pierced and rolled to form a hollow shell, and then the hollow shell In the method for producing a seamless steel pipe, the inner surface of the workpiece is stretch-rolled while being constrained with a plug, then reheated, then subjected to constant diameter rolling, and then cooled to become a seamless steel pipe. Heat (by induction heating) so that the front end in the longitudinal direction of the workpiece immediately before the stretch rolling (longer rolling → plug mill rolling → reeler rolling) is 30 to 400 ° C. higher than the rear end. Stated That.
然しながら、上述の従来技術では、高Cr鋼(Cr:12質量%以上を含有する鋼)の丸ビレットを出発素材としたとき、回転炉加熱工程の加熱温度が高すぎる(1250℃超である)と、δフェライトが現れて、ピアサー穿孔工程で材料割れやヘゲ、カブレ疵が発生する。そこで、δフェライトを生成させないために前記加熱温度を下げる(1250℃以下とする)と、マンドレルミル圧延工程の圧延温度が下がり過ぎ、管体に圧延ロールや管案内工具(ガイド、シュー等)との焼付き疵が多発する。 However, in the above-described prior art, when a round billet of high Cr steel (Cr: steel containing 12% by mass or more) is used as a starting material, the heating temperature in the rotary furnace heating process is too high (over 1250 ° C.). Then, δ ferrite appears, and material cracks, lashes and fogging occur in the piercer drilling process. Therefore, if the heating temperature is lowered (1250 ° C. or lower) in order to prevent the formation of δ ferrite, the rolling temperature in the mandrel mill rolling process is too low, and a roll and a pipe guide tool (guide, shoe, etc.) There are many seizure potatoes.
即ち、従来技術では、被加工材(穿孔前は丸ビレットであり、穿孔後は管体である)が高Cr鋼である場合、ピアサー穿孔工程における材料割れやヘゲ、カブレ疵発生とマンドレルミル圧延工程における焼付き発生とを両方とも防止する事が困難であるという課題があった。 That is, in the prior art, when the work material (round billet before drilling and tube after drilling) is high Cr steel, material cracks, scabs and burrs are generated in the piercer drilling process and mandrel mill There was a problem that it was difficult to prevent both the occurrence of seizure in the rolling process.
発明者らは前記課題を解決する為に鋭意検討し、その結果、前記マンドレルミルの入側に、該入側を通過中の管体を全長に亘って誘導加熱する誘導加熱装置を設置し、特定の条件で運用すれば前記課題を解決できるという知見を得て、本発明を成した。
即ち本発明は以下の通りである。
(1)丸ビレットを加熱する第1加熱を行う回転炉等の第1加熱炉と、次いで前記加熱後の丸ビレットを穿孔して管体となすピアサーと、次いで前記穿孔してなる管体に延伸圧延を施す一群の圧延機からなるマンドレルミルと、次いで前記延伸圧延後の管体を再加熱する再加熱炉と、次いで前記再加熱後の管体を定径圧延する一群の圧延機からなるレデューサーミルとを有し、さらに前記マンドレルミルの入側に、該入側を通過中の管体を全長に亘って誘導加熱する誘導加熱装置を設置してなる継目無鋼管用の圧延設備列を用いてCrを12質量%以上含有する継目無鋼管である高Cr継目無鋼管を製造する方法であって、
前記第1加熱によって前記丸ビレット全体を1100〜1240℃の範囲に加熱し、次いで前記丸ビレットを穿孔して前記管体とした後、前記誘導加熱装置にて前記管体の温度を30〜180℃上昇させて、前記管体を全長にわたって1030℃以上として前記延伸圧延を開始することを特徴とする高Cr継目無鋼管の製造方法。
The inventors have intensively studied to solve the above problems, and as a result, an induction heating device for induction heating the entire length of the tube passing through the entry side is installed on the entry side of the mandrel mill, The present invention has been made by obtaining the knowledge that the above-mentioned problems can be solved by operating under specific conditions.
That is, the present invention is as follows.
(1) A first heating furnace such as a rotary furnace that performs first heating for heating a round billet, a piercer that drills the round billet after heating to form a tubular body, and then a tubular body that is drilled. It consists of a mandrel mill consisting of a group of rolling mills for drawing and rolling, then a reheating furnace for reheating the tube after the drawing and rolling, and then a group of rolling mills for constant diameter rolling of the tube after the reheating. A rolling mill line for seamless steel pipes, further comprising an induction heating device installed on the inlet side of the mandrel mill for induction heating of the tube passing through the inlet side over the entire length. A method for producing a high Cr seamless steel pipe, which is a seamless steel pipe containing 12% by mass or more of Cr,
Wherein the whole round billet heated to a range of 1,100-12 4 0 ° C. by the first heating, then after said tube by puncturing the round billet, 30 the temperature of the pipe body by the induction heating device to 180 ° C. is raised, high Cr seamless steel pipe production method, which comprises initiating the elongation rolling the tube body as above 1030 ° C. over the entire length.
本発明によれば、被加工材(穿孔前は丸ビレットであり、穿孔後は管体である)が高Cr鋼であっても、ピアサー穿孔工程における材料割れやヘゲ、カブレ疵発生とマンドレルミル圧延工程における焼付き発生とを両方とも防止する事が容易にできるようになる。 According to the present invention, even if the workpiece (round billet before drilling and tube after drilling) is high Cr steel, material cracks and scabs and burrs are generated in the piercer drilling process and mandrels Both seizure generation in the mill rolling process can be easily prevented.
図1は、本発明例に用いた圧延設備列を示す概略図である。図1において、8は誘導加熱装置であり、図2の従来例と同一又は相当部材には同じ符号を付し、説明を省略する。
本発明例における誘導加熱装置8はトンネル式であって、マンドレルミル3の入側に設置され、該入側を通過中の管体11を全長に亘って誘導加熱する。この誘導加熱により、マンドレルミル入側の管体温度を従来よりも高くする事ができる。従って、高Cr鋼の被圧延材に対し、マンドレルミル3において、入側の管体温度を高める事で管体表面のスケール量を増す事ができ、又、圧延荷重を減らす事ができるので、高Cr鋼に特有なロールやガイド等の工具と管体とのメタルタッチによる焼付きを防止でき、以て製品表面疵の発生が減少する。
FIG. 1 is a schematic view showing a rolling equipment line used in the example of the present invention. In FIG. 1, 8 is an induction heating apparatus, and the same code | symbol is attached | subjected to the same or equivalent member as the prior art example of FIG. 2, and description is abbreviate | omitted.
The induction heating device 8 in the example of the present invention is a tunnel type, and is installed on the entry side of the mandrel mill 3 and induction-heats the
又、誘導加熱装置8の設置により、上述の通りマンドレルミル入側で管体温度を高めることができる為、高Cr鋼の被圧延材に対し、回転炉加熱工程での加熱温度を1240℃以下に下げてδフェライトの生成を抑制し、以てピアサー穿孔工程での材料割れやヘゲ、カブレ疵発生を減少させることができる。
従って、ピアサー穿孔工程における材料割れやヘゲ、カブレ疵発生とマンドレルミル圧延工程における焼付き発生とを両方とも防止する事が容易にできるようになる。
In addition, since the tube temperature can be increased on the mandrel mill entry side as described above by installing the induction heating device 8, the heating temperature in the rotary furnace heating process is set to 12 40 for the material to be rolled of high Cr steel. By lowering the temperature to below ℃, the formation of δ-ferrite can be suppressed, thereby reducing the occurrence of material cracking, shave and fogging in the piercer drilling process.
Accordingly, it is possible to easily prevent both material cracks, swells and fogging in the piercer drilling process and seizure in the mandrel mill rolling process.
発明者らの調査によると、回転炉1による高Cr鋼丸ビレットの加熱温度はδフェライト生成抑制のために1100〜1240℃の温度範囲が必要であるが、該温度範囲で加熱すると、従来ではマンドレルミル3入側の管体温度は、前記焼付きが起こらない温度範囲の下限(Tcと記す。Tc≒1030℃)よりも30℃以上低くなる事が多い。よって、かかる温度低下を補償するために、誘導加熱装置8は、該誘導加熱による管体11の温度上昇量(ΔTと記す)が30℃以上となる誘導加熱能力を有するものである事が必要である。但し、前記誘導加熱能力に係るΔTは、これを180℃超としても焼付き防止効果が飽和し、設備費、電力費が嵩むだけとなるから、より好ましくは、30℃以上180℃以下である。
According to the inventors research, the heating temperature of the high Cr steel round billet by rotating furnace 1 is required the temperature range of from 1,100 to 12 4 0 ° C. for δ ferrite suppression, when heated in a temperature range, Conventionally, the tube temperature on the inlet side of the mandrel mill 3 is often 30 ° C. or more lower than the lower limit of the temperature range in which seizure does not occur (denoted as Tc, Tc≈1030 ° C.). Therefore, in order to compensate for such a temperature drop, the induction heating device 8 needs to have an induction heating capability in which the temperature rise amount (denoted as ΔT) of the
図1の圧延設備列を用い、被加工材=Cr:12.0質量%を含有する鋼、回転炉加熱温度=1240℃、誘導加熱装置による管体温度上昇量ΔT=30℃、延伸圧延開始温度=1030℃、再加熱炉温度=1000℃として、継目無鋼管を240本製造し、ケースA(本発明例)とした。
又、図2の圧延設備列を用い、被加工材=同上、回転炉加熱温度=同上、延伸圧延開始温度=1000℃、再加熱炉温度=同上として、継目無鋼管を200本製造し、ケースB(比較例)とした。
Using the rolling equipment row of FIG. 1, work material = Cr: steel containing 12.0% by mass, rotary furnace heating temperature = 1240 ° C., tube temperature increase ΔT = 30 ° C. by induction heating device, start of stretching rolling 240 seamless steel pipes were manufactured at a temperature = 1030 ° C. and a reheating furnace temperature = 1000 ° C. to obtain Case A (Example of the present invention).
In addition, using the rolling equipment row of FIG. 2, 200 pieces of seamless steel pipes were manufactured with the work material = same as above, rotary furnace heating temperature = same as above, stretch rolling start temperature = 1000 ° C., reheating furnace temperature = same as above, B (comparative example).
ケースAとケースBとで、材料割れ、ヘゲ、カブレ疵発生本数率、及び、焼付き発生本数率を比較したところ、ケースAでは、材料割れ、ヘゲ、カブレ疵発生本数率はケースBと同程度に低い値であったが、焼付き発生本数率はケースBを100とした相対値で2.2と、ケースBに比べて格段に低い値であった。 In case A and case B, the rate of occurrence of material cracks, scabs and fogging and the number of seizures were compared. However, the rate of occurrence of seizure was 2.2, which is a relative value with respect to case B as 100, which was much lower than that of case B.
1 回転炉(第1加熱炉)
2 ピアサー(バー穿孔型)
3 マンドレルミル
4 再加熱炉
5 レデューサーミル
8 誘導加熱装置
10 丸ビレット(穿孔前の被加工材)
11 管体(穿孔後の被加工材)
1 Rotary furnace (first heating furnace)
2 Piercer (Bar perforated type)
3 Mandrel mill 4 Reheating
11 Tube (work material after drilling)
Claims (1)
前記第1加熱によって前記丸ビレット全体を1100〜1240℃の範囲に加熱し、次いで前記丸ビレットを穿孔して前記管体とした後、前記誘導加熱装置にて前記管体の温度を30〜180℃上昇させて、前記管体を全長にわたって1030℃以上として前記延伸圧延を開始することを特徴とする高Cr継目無鋼管の製造方法。 Stretch rolling the first heating furnace such as a rotary furnace that performs the first heating for heating the round billet, the piercer that drills the round billet after the heating to form a tubular body, and then the tubular body that is drilled. A mandrel mill comprising a group of rolling mills, a reheating furnace for reheating the tube after the drawing and rolling, and a reducer mill comprising a group of rolling mills for constant-diameter rolling of the tube after the reheating. And using a rolling equipment line for seamless steel pipes, in which an induction heating device is installed on the inlet side of the mandrel mill for induction heating over the entire length of the tube passing through the inlet side. A high Cr seamless steel pipe that is a seamless steel pipe containing 12% by mass or more,
Wherein the whole round billet heated to a range of 1,100-12 4 0 ° C. by the first heating, then after said tube by puncturing the round billet, 30 the temperature of the pipe body by the induction heating device to 180 ° C. is raised, high Cr seamless steel pipe production method, which comprises initiating the elongation rolling the tube body as above 1030 ° C. over the entire length.
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