EP0370588B1 - Procédé de fabrication de tubes en acier sans soudure ayant une résistance élevée - Google Patents

Procédé de fabrication de tubes en acier sans soudure ayant une résistance élevée Download PDF

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Publication number
EP0370588B1
EP0370588B1 EP89250030A EP89250030A EP0370588B1 EP 0370588 B1 EP0370588 B1 EP 0370588B1 EP 89250030 A EP89250030 A EP 89250030A EP 89250030 A EP89250030 A EP 89250030A EP 0370588 B1 EP0370588 B1 EP 0370588B1
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EP
European Patent Office
Prior art keywords
steel
pipes
temperature
maximum
rolling
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.)
Expired - Lifetime
Application number
EP89250030A
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German (de)
English (en)
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EP0370588A1 (fr
Inventor
Ingo Dr.-Ing. Von Hagen
Gerd Dr.-Ing. Homberg
Christoph Dr.-Ing. Prasser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Publication date
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Application filed by Mannesmann AG filed Critical Mannesmann AG
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Definitions

  • the invention relates to a method for producing high-strength seamless steel tubes by hot rolling and subsequent accelerated cooling from the rolling heat.
  • These pipes should be used as oilfield and line pipes and at least comply with API quality level X70.
  • Seamless tubes are usually manufactured by hot rolling steel blocks that have been heated to around 1200 - 1250 ° C.
  • the main forming of the rolling process takes place just below the block drawing temperature, i.e. at very high temperatures.
  • the recrystallization of the structure caused by the deformation leads to strong grain growth due to these high temperatures and consequently to a corresponding deterioration in the toughness behavior of the materials. It has therefore always been considered necessary to connect a separate heat treatment in the form of a normalization or tempering treatment to the rolling process, in which a finer structure and thereby an improvement in the toughness properties is achieved by re-grain.
  • Such heat treatment requires a significant amount of time and money, so it is desirable to find a way to avoid this additional treatment.
  • a bainitic structure provides good toughness properties.
  • this route has so far not been practical for large-scale use because the temperature control during the accelerated cooling could not take place in such a way that the bainite region was reached safely.
  • the object of the invention is therefore to provide a method of the generic type with which seamless tubes with high yield strengths and high tensile strengths can be produced with good toughness properties (A v + 20 ° C > 60 J) (API quality level X70 or higher), without having to undergo additional heat treatment after rolling.
  • a v + 20 ° C > 60 J API quality level X70 or higher
  • temperature differences in the rolled tube of at least 100-150 K should be permissible without the required properties being called into question, and the material used should be inexpensive to produce, ie it should not require large amounts of expensive alloying elements.
  • the solution according to the invention essentially consists of a targeted selection of materials with narrow limits for the individual alloy elements and predetermined design rules for individual elements with one another, and a quenching treatment tailored to this material. It was possible to find a steel which is not only inexpensive to produce because it does not require large amounts of expensive alloying elements, but which surprisingly ensures the formation of bainite over a wide temperature interval (e.g. 150 K) of the cooling (trapping temperature). The formation of ferrite can easily be limited to uncritical values of less than 10% structure. It was found that the ratio of the elements copper and nickel to one another and the sum of the contents of Cr and Mo are extremely important for the cooling behavior with regard to achieving uniform strength and toughness values. This also applies to the narrowly limited content of carbon.
  • the measured values of the yield strength and the tensile strength are almost at a constant level in an interception temperature range of 350-520 ° C.
  • the yield point ratios R t0.5 / R m are consistently below 80%.
  • the steel with the cooling treatment according to the invention provides good impact energy values (FIG. 2). In the interval of the interception temperature of 350 - 520 ° C, this is always significantly more than 60 J at a test temperature of + 20 ° C.
  • the method according to the invention enables the production of high-strength steel pipes as oilfield and conduit pipes using an inexpensive alloy and in spite of the absence of a (costly) separate heat treatment, and by accelerated cooling from the rolling heat even on pipes that have an uneven temperature distribution, certainly a bainitic Microstructure with good toughness properties is generated over the entire pipe length. Differences in the interception temperature of up to 150 K and, depending on the setting of the alloy, also beyond do not have a critical effect on the strength and toughness properties.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (3)

  1. Procédé pour fabriquer des tubes en acier sans soudure ayant une résistance élevée, par laminage à chaud et, ensuite, refroidissement accéléré,
    caractérisé par la combinaison des mesures suivantes :
    a) utilisation de blocs en acier calmé par de l'aluminium et/ou du silicium, ayant la composition suivante (pourcentages pondéraux) : C 0,08 - 0,13 % Mn 1,40 - 1,90 % Cr 0 - 0,50 % Mo 0 - 0,50 % Ni 0 - 0,70 % Cu 0 - 0,40 % V 0,04 - 0,13 % P max. 0,020 % S max. 0,010 %
    le restant étant du fer et des impuretés usuelles, la somme des teneurs en Cr et Mo étant dans la plage de 0,20 à 0,70 % et le rapport quantitatif Cu/Ni, quand les deux éléments sont présents, étant limité au maximum à 1,
    b) les blocs sont chauffés à une température de 1150 à 1280°C et laminés à chaud en tubes de façon connue,
    c) après avoir quitté la dernière étape de laminage à chaud, les tubes, présentant une température supérieure à Ar3, sont directement trempés, à partir de la chaleur de laminage, en 5-50 secondes en évitant largement la formation de ferrite (max. 10%), jusqu'à une plage de températures de 340-560°C et, ensuite, encore refroidis à l'air.
  2. Procédé selon la revendication 1,
    caractérisé en ce qu'au maximum 0,04 % de Nb est ajouté à l'acier, aux charges de l'élément restant.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce qu'au maximum 0,04 % de Ti est ajouté à l'acier, aux charges de l'élément restant.
EP89250030A 1988-09-16 1989-09-07 Procédé de fabrication de tubes en acier sans soudure ayant une résistance élevée Expired - Lifetime EP0370588B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89250030T ATE89869T1 (de) 1988-09-16 1989-09-07 Verfahren zur herstellung hochfester nahtloser stahlrohre.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3832014A DE3832014C2 (de) 1988-09-16 1988-09-16 Verfahren zur Herstellung hochfester nahtloser Stahlrohre
DE3832014 1988-09-16

Publications (2)

Publication Number Publication Date
EP0370588A1 EP0370588A1 (fr) 1990-05-30
EP0370588B1 true EP0370588B1 (fr) 1993-05-26

Family

ID=6363380

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89250030A Expired - Lifetime EP0370588B1 (fr) 1988-09-16 1989-09-07 Procédé de fabrication de tubes en acier sans soudure ayant une résistance élevée

Country Status (5)

Country Link
US (1) US5019180A (fr)
EP (1) EP0370588B1 (fr)
JP (1) JPH02115318A (fr)
AT (1) ATE89869T1 (fr)
DE (2) DE3832014C2 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2711163B2 (ja) * 1990-01-12 1998-02-10 新日本製鐵株式会社 耐ｃｏ▲下２▼腐食性の優れた高耐食性低合金ラインパイプ用鋼の製造法
FR2679924B1 (fr) * 1991-07-30 1993-12-10 Ascometal Procede de fabrication d'un tube en acier a paroi mince, acier pour la realisation de ce tube et tube pour cadre de cycle obtenu.
AT902U1 (de) * 1995-08-28 1996-07-25 Plansee Ag Verfahren zur herstellung nahtloser rohre
DE59704264D1 (de) * 1997-01-15 2001-09-13 Mannesmann Ag Verfahren zur herstellung nahtloser leitungsrohre mit stabiler streckgrenze bei erhöhten einsatztemperaturen
DE102008011856A1 (de) * 2008-02-28 2009-09-10 V&M Deutschland Gmbh Hochfester niedriglegierter Stahl für nahtlose Rohre mit hervorragender Schweißbarkeit und Korrosionsbeständigkeit
CN101829679B (zh) * 2009-03-09 2013-09-04 鞍钢股份有限公司 一种改善热轧油井管接箍料冲击韧性的生产方法
CN103627887B (zh) * 2013-08-28 2015-06-03 内蒙古北方重工业集团有限公司 消除低碳低合金耐热钢碳化物析出的热处理方法
CN106676391A (zh) * 2016-12-12 2017-05-17 中国长江三峡集团公司 一种大型水轮发电机组主轴锻件
CN106591720A (zh) * 2016-12-12 2017-04-26 中国长江三峡集团公司 大型水轮发电机组主轴锻件
CN109001106B (zh) * 2018-06-05 2022-04-22 长江三峡技术经济发展有限公司 一种水轮发电机高强度热轧磁轭钢板冲击吸收能量有效考核方法
CN113249553B (zh) * 2021-06-25 2021-11-05 宁波威乐新材料科技有限公司 一种钢材的淬火方法、热成型工艺以及钢材工件

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT193914B (de) * 1954-06-02 1957-12-10 Oesterr Alpine Montan Stahl für Bewehrungszwecke im Bauwesen
PL79948B1 (fr) * 1968-01-31 1975-08-30 Mitsubishi Jukogyo Kabushiki Kaisha
FR1566594A (fr) * 1968-03-22 1969-05-09
JPS52152814A (en) * 1976-06-14 1977-12-19 Nippon Steel Corp Thermo-mechanical treatment of seamless steel pipe
JPS5397922A (en) * 1977-02-08 1978-08-26 Nippon Kokan Kk <Nkk> Manufacture of non-refined high tensile steel
FR2525503B1 (fr) * 1982-04-22 1984-07-13 Ugine Aciers
DE3311629C2 (de) * 1983-03-28 1986-08-14 Mannesmann AG, 4000 Düsseldorf Verfahren zum Herstellen von nahtlosen Stahlrohren

Also Published As

Publication number Publication date
ATE89869T1 (de) 1993-06-15
DE3832014A1 (de) 1990-03-22
EP0370588A1 (fr) 1990-05-30
DE3832014C2 (de) 1994-11-24
DE58904493D1 (de) 1993-07-01
US5019180A (en) 1991-05-28
JPH02115318A (ja) 1990-04-27

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