JPH05305A - Manufacture of seamless tube of high chromium steel excellent in quality of outer surface of tube - Google Patents
Manufacture of seamless tube of high chromium steel excellent in quality of outer surface of tubeInfo
- Publication number
- JPH05305A JPH05305A JP1226591A JP1226591A JPH05305A JP H05305 A JPH05305 A JP H05305A JP 1226591 A JP1226591 A JP 1226591A JP 1226591 A JP1226591 A JP 1226591A JP H05305 A JPH05305 A JP H05305A
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- pipe
- rolled
- steel
- tube
- 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.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 title abstract 2
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 239000000463 material Substances 0.000 abstract description 20
- 230000007547 defect Effects 0.000 abstract description 8
- 239000010410 layer Substances 0.000 abstract description 8
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 8
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000002344 surface layer Substances 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000005261 decarburization Methods 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007751 thermal spraying Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000000573 anti-seizure effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
- Coating With Molten Metal (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
(57)【要約】
【目的】 本発明は、マンネスマン圧延法によって高ク
ロム鋼継目無管を製造するにあたって、コスト、生産性
の問題を招く管外面圧延疵を防止する手段を提供する。
【構成】 圧延素材（丸ビレットもしくは角ブルーム）
の表面にアルミニウム被膜を予め形成させておくと、素
材加熱時にアルミニウムの素材表層への拡散によって被
圧延材表層に熱間加工性に優れた合金層が形成される。
また、この合金層の存在により工具と被圧延材の焼付が
軽減される。さらにアルミニウムは素材加熱時の脱炭に
よるδフェライト析出を防止する。これらの複合作用に
より、管外面圧延疵が防止できる。(57) [Summary] [Object] The present invention provides a means for preventing a pipe outer surface rolling defect which causes problems of cost and productivity in producing a high chromium steel seamless pipe by the Mannesmann rolling method. [Composition] Rolled material (round billet or square bloom)
If an aluminum coating is formed on the surface of the material in advance, an alloy layer having excellent hot workability is formed on the surface layer of the material to be rolled by diffusion of aluminum into the surface layer of the material during heating of the material.
Further, the existence of this alloy layer reduces seizure between the tool and the material to be rolled. Furthermore, aluminum prevents precipitation of δ-ferrite due to decarburization during heating of the material. Due to the combined action of these, rolling defects on the outer surface of the pipe can be prevented.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、圧延疵のない管外面品
質に優れた高Ｃｒ鋼継目無管の製造法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a high Cr steel seamless pipe which is free from rolling defects and has an excellent outer surface quality.
【０００２】[0002]
【従来の技術】石油、ガスなどのエネルギー開発産業に
おいて、近年その開発対象となる油、ガス田の環境が過
酷化してきている。すなわち、深井戸化すると共に腐食
性の強いガスの含有量が多くなってきている。このよう
な環境変化に対応し得る継目無油井管材料として１３％
Ｃｒ鋼（主にＳＵＳ４２０）に代表される高Ｃｒ鋼が使
用されるようになってきている。また、火力発電用ボイ
ラーにおいても高温高圧操業のニーズから９％Ｃｒをベ
ースとした各種フェライト系耐熱鋼管の適用が増えてき
ている。2. Description of the Related Art In the energy development industries such as oil and gas, the environment of oil and gas fields to be developed has become severe in recent years. That is, the deeper the well is, the more the content of highly corrosive gas is increasing. 13% as a seamless oil well pipe material that can respond to such environmental changes
High Cr steel represented by Cr steel (mainly SUS420) has come to be used. Further, in the boiler for thermal power generation, the application of various ferritic heat resistant steel pipes based on 9% Cr is increasing due to the needs of high temperature and high pressure operation.
【０００３】１３Ｃｒ鋼（ＳＵＳ４２０）、９Ｃｒ鋼継
目無管は、一般的には、圧延法によって製造される。し
かしながら、圧延法による場合、管内もさることながら
管外面に圧延疵や割れが生じるという問題がある。従
来、この鋼のマンネスマン圧延における疵対策として、
ガイドシューとの焼付によって生じるシューマーク疵を
対象とした次の技術が提唱されてきている。すなわち
特開平１−３０３１１号公報には、被圧延材と当接する
ガイドシュー表面に焼付防止剤を供給しながら圧延する
ことによりシューマーク発生を防止する技術が提示さ
れ、また特開昭６０−１８４４１０号公報に見られる
如く、被圧延材の外面に予め潤滑剤を塗布した後、圧延
しシューマーク発生を防止する技術が提案されている。13Cr steel (SUS420) and 9Cr steel seamless pipes are generally manufactured by a rolling method. However, the rolling method has a problem that rolling flaws and cracks occur on the outer surface of the pipe as well as inside the pipe. Conventionally, as a flaw countermeasure in the Mannesmann rolling of this steel,
The following techniques have been proposed for targeting shoe mark defects caused by burning with a guide shoe. That is, Japanese Unexamined Patent Publication No. 1-30311 discloses a technique for preventing the generation of shoe marks by rolling while supplying an anti-seizure agent to the surface of the guide shoe that comes into contact with the material to be rolled, and Japanese Patent Laid-Open No. 60-184410. As can be seen in the publication, a technique has been proposed in which a lubricant is applied to the outer surface of a material to be rolled in advance and then rolled to prevent the generation of shoe marks.
【０００４】しかしながら、シューマークのみが圧延疵
の全てではない。スケール噛み込み疵も圧延疵として無
視できない。さらに、同じ１３％Ｃｒ鋼でもＣ量がＳＵ
Ｓ４２０より少ないため熱間加工時にδフェライトが析
出し割れに至るＳＵＳ４１０鋼の場合には、製品管とな
し得ない場合もある。However, only the shoe marks are not all of the rolling flaws. Scale biting flaws cannot be ignored as rolling flaws. Furthermore, even with the same 13% Cr steel, the C content is SU
In the case of SUS410 steel, which is less than S420 and causes δ ferrite to precipitate during hot working and cracking, there are cases where it cannot be used as a product pipe.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、このような
問題から、マンネスマン圧延法によって高Ｃｒ鋼継目無
管を製造するに当たって、コスト、生産性の問題を招く
圧延疵を防止する手段を提供することを目的とする。SUMMARY OF THE INVENTION The present invention provides a means for preventing rolling defects that cause cost and productivity problems in producing a high Cr steel seamless pipe by the Mannesmann rolling method from the above problems. The purpose is to do.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、かかる目
的を達成すべく圧延疵の発生機構まで遡って研究開発を
行った結果、圧延疵の原因は素材加熱中に表面に形成さ
れるδフェライトにあることを知見した。すなわち、加
熱中に素材の表層が脱炭されるために形成されるδフェ
ライトは工具に焼付易いため焼付疵の原因となる。ま
た、一度、工具に付いた被圧延材の小片が再度、被圧延
材に転写されることによって疵となる。さらに、マトリ
ックスであるオーステナイトとの変形能、変形抵抗の違
いからδフェライト／オーステナイト境界が割れの起点
となる。特に、ＳＵＳ４１０鋼では、表層の脱炭層のみ
ならず内部にもδフェライトが存在するため割れの深さ
は数mmにも及ぶ。したがって、圧延疵や割れを防止する
にはδフェライトの形成を防止することが重要である。
このような問題を克服する技術を種々探索した結果、素
材表面に予めＡｌ層を形成させておくことが有効である
との知見を得た。すなわち、本発明の要旨とするところ
は、アルミニウム被膜を表面に形成させた高Ｃｒ鋼の丸
ビレットもしくは角ブルームを用いて、マンネスマン圧
延法により製管することを特徴とする高Ｃｒ鋼継目無管
の製造方法である。Means for Solving the Problems The inventors of the present invention have conducted research and development back to the mechanism of occurrence of rolling flaws in order to achieve such an object. As a result, the cause of rolling flaws is formed on the surface during heating of the material. It was found that it was in δ ferrite. That is, the δ-ferrite formed by decarburizing the surface layer of the material during heating easily causes seizure on the tool, which causes seizure flaws. Moreover, once the small piece of the material to be rolled attached to the tool is transferred to the material to be rolled again, it becomes a flaw. Furthermore, the δ ferrite / austenite boundary becomes the starting point of cracking due to the difference in deformability and deformation resistance with respect to the matrix austenite. In particular, in SUS410 steel, since δ ferrite exists not only in the surface decarburized layer but also inside, the crack depth reaches several mm. Therefore, in order to prevent rolling flaws and cracks, it is important to prevent the formation of δ ferrite.
As a result of searching various techniques for overcoming such a problem, it was found that it is effective to previously form an Al layer on the surface of the material. That is, the gist of the present invention is that a high Cr steel seamless pipe characterized by being manufactured by the Mannesmann rolling method using a round billet or square bloom of high Cr steel having an aluminum coating formed on the surface thereof. Is a manufacturing method.
【０００７】以下、本発明について詳細に説明する。電
気炉、転炉など通常の溶解炉で溶製された高Ｃｒ鋼の湯
を連続鋳造法または分解圧延法により一般的に使用され
る形状の丸ビレットまた角ビレットに成形した後、その
表面にアルミニウム被膜をメッキ法、溶射法など任意な
方法で被覆する。しかる後、前記ビレットは高温度に加
熱し、マンネスマン穿孔機で厚肉中空素管に加工し、圧
延、磨管機、定型機、必要によってはさらに再加熱して
絞り圧延機仕上げるマンネスマン圧延法を経て管製品に
する。The present invention will be described in detail below. After the molten high-Cr steel melted in a normal melting furnace such as an electric furnace or a converter is formed into a round billet or a square billet having a shape generally used by the continuous casting method or the decomposition rolling method, the surface of the billet is formed. The aluminum coating is coated by an arbitrary method such as a plating method or a thermal spraying method. After that, the billet is heated to a high temperature, processed into a thick hollow shell with a Mannesmann perforator, and rolled, a tube polisher, a standard machine, and a Mannesmann rolling method of further reheating to finish the drawing rolling machine. After that, it becomes a tube product.
【０００８】このようなマンネスマン圧延法の製管工程
において、丸ビレットまた角ビレットの表面に被覆され
たアルミニウム被膜は、次のような作用を奏する。すな
わち 加熱時に、アルミニウム被膜が高Ｃｒ鋼の脱炭を防
止しδフェライトの析出を防ぐ。 加熱時にアルミニウムの素材表層への拡散によっ
て、被圧延材表層に熱間変形能に優れた合金層が形成さ
れるため、圧延における付加剪断歪みに対して表層が良
く追従して変形され、結果として割れやキズなどの欠陥
を引き起こさない。 さらにアルミニウム拡散層の最表層に形成されるス
ケールは、工具と被圧延材の金属対金属接触を有効に防
ぎ、焼付を防止するため、シューマークが激減するほか
飛び込みキズなども減少する。In the pipe manufacturing process of the Mannesmann rolling method, the aluminum coating film coated on the surface of the round billet or the square billet has the following effects. That is, during heating, the aluminum coating prevents decarburization of high Cr steel and prevents precipitation of δ ferrite. The diffusion of aluminum into the surface layer of the material during heating forms an alloy layer with excellent hot deformability on the surface layer of the material to be rolled, so the surface layer deforms well following the additional shear strain in rolling, resulting in Does not cause defects such as cracks and scratches. Further, the scale formed on the outermost layer of the aluminum diffusion layer effectively prevents metal-to-metal contact between the tool and the material to be rolled and prevents seizure, so that the shoe marks are drastically reduced and diving scratches are also reduced.
【０００９】上記のような本発明によって製造された高
Ｃｒ鋼の継目無鋼管は、工具の焼付損傷を起こさせるこ
ともなく、圧延疵のない管外面質の優れたものが得られ
る。The high Cr steel seamless steel pipe produced according to the present invention as described above can obtain a pipe outer surface quality free from rolling flaws without causing seizure damage of tools.
【００１０】[0010]
【実施例】次に、本発明を実施例に基づいてさらに説明
する。マンネスマン圧延法によって試験圧延を行った。
供試材として、その成分を表１に示すように、Ａ〜Ｃの
３種の高Ｃｒ鋼を用いた。鋼ＡはＳＵＳ４１０相当鋼、
鋼ＢはＳＵＳ４２０相当鋼である。転炉で出鋼されたこ
れらの合金を２１５×２１５mm断面のブルームに成形
し、アルミニウム溶射を施して圧延用素材とした。本実
施例では溶射によってアルミニウム被膜を形成したが、
メッキなどの方法によっても良い。圧延材を酸洗した
後、管外表面を目視観察して評価した試験結果を表２に
示す。EXAMPLES Next, the present invention will be further described based on examples. Test rolling was performed by the Mannesmann rolling method.
As the test materials, as shown in Table 1, three kinds of high Cr steels A to C were used. Steel A is SUS410 equivalent steel,
Steel B is SUS420 equivalent steel. These alloys, which were tapped in the converter, were formed into blooms having a cross section of 215 x 215 mm, and aluminum was sprayed to obtain raw materials for rolling. In this example, the aluminum coating was formed by thermal spraying,
It may be plated. Table 2 shows the test results evaluated by visually observing the outer surface of the pipe after pickling the rolled material.
【００１１】表２より明らかな如くNo．１〜３の本発明
によれば、良好な管外面品質を得ることができる。一
方、比較例No．４〜６では疵や割れが多発した。As is clear from Table 2, No. According to the present invention of 1 to 3, good tube outer surface quality can be obtained. On the other hand, Comparative Example No. Nos. 4 to 6 had many defects and cracks.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】[0014]
【発明の効果】以上のような本発明によれば、圧延疵を
発生させることなく管外面品質の良好な高Ｃｒ鋼継目無
管をマンネスマン圧延法によって製造することができ
る。また、このような効果は、よりＣｒ量が少なく加工
の容易な鋼にも及ぶものである。さらに、本発明によれ
ば、アルミニウム合金層およびアルミナ主体のスケール
によって地金と工具の直接接触が防止できることから、
副次的に工具の焼付損傷も防止できる。According to the present invention as described above, it is possible to manufacture a high Cr steel seamless pipe having a good pipe outer surface quality by the Mannesmann rolling method without causing rolling defects. Further, such an effect extends to steel having a smaller amount of Cr and easy to work. Furthermore, according to the present invention, since the direct contact between the metal and the tool can be prevented by the scale mainly composed of the aluminum alloy layer and the alumina,
It is also possible to prevent seizure damage to the tool as a side effect.
Claims (1)
Ｃｒ鋼の丸ビレットもしくは角ブルームを用いて、マン
ネスマン圧延法により製管することを特徴とする管外面
品質に優れた高Ｃｒ鋼継目無管の製造方法。Claims: 1. A pipe made by the Mannesmann rolling method using a round billet or a square bloom of high Cr steel having an aluminum coating formed on the surface, which is excellent in outer surface quality of the pipe. High Cr steel seamless pipe manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1226591A JPH05305A (en) | 1991-02-01 | 1991-02-01 | Manufacture of seamless tube of high chromium steel excellent in quality of outer surface of tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1226591A JPH05305A (en) | 1991-02-01 | 1991-02-01 | Manufacture of seamless tube of high chromium steel excellent in quality of outer surface of tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05305A true JPH05305A (en) | 1993-01-08 |
Family
ID=11800539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1226591A Withdrawn JPH05305A (en) | 1991-02-01 | 1991-02-01 | Manufacture of seamless tube of high chromium steel excellent in quality of outer surface of tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05305A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003027203A (en) * | 2001-07-11 | 2003-01-29 | Nippon Steel Corp | Heating method of steel sheet for thermoforming |
| CN103924273A (en) * | 2014-03-18 | 2014-07-16 | 泰州双羊精密无缝钢管有限公司 | Corrosion resistance seamless steel pipe treatment process |
| CN103924273B (en) * | 2014-03-18 | 2016-11-30 | 泰州双羊精密无缝钢管有限公司 | A kind of process technique of corrosion resistance seamless steel pipe |
-
1991
- 1991-02-01 JP JP1226591A patent/JPH05305A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003027203A (en) * | 2001-07-11 | 2003-01-29 | Nippon Steel Corp | Heating method of steel sheet for thermoforming |
| CN103924273A (en) * | 2014-03-18 | 2014-07-16 | 泰州双羊精密无缝钢管有限公司 | Corrosion resistance seamless steel pipe treatment process |
| CN103924273B (en) * | 2014-03-18 | 2016-11-30 | 泰州双羊精密无缝钢管有限公司 | A kind of process technique of corrosion resistance seamless steel pipe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19980514 |