EP0092629A1 - Verfahren zur Herstellung von Stäben und Röhren aus Stählen mit hohen mechanischen Eigenschaften - Google Patents

Verfahren zur Herstellung von Stäben und Röhren aus Stählen mit hohen mechanischen Eigenschaften Download PDF

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Publication number
EP0092629A1
EP0092629A1 EP82420154A EP82420154A EP0092629A1 EP 0092629 A1 EP0092629 A1 EP 0092629A1 EP 82420154 A EP82420154 A EP 82420154A EP 82420154 A EP82420154 A EP 82420154A EP 0092629 A1 EP0092629 A1 EP 0092629A1
Authority
EP
European Patent Office
Prior art keywords
bars
tubes
mass
hot
steel
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
Application number
EP82420154A
Other languages
English (en)
French (fr)
Other versions
EP0092629B1 (de
Inventor
Bernard Heritier
Philippe Maitrepierre
Jaime Rofes-Vernis
Alain Wyckaert
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.)
Ugine Aciers
Original Assignee
Ugine Aciers
Ugine Savoie SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ugine Aciers, Ugine Savoie SA filed Critical Ugine Aciers
Priority to AT82420154T priority Critical patent/ATE20479T1/de
Publication of EP0092629A1 publication Critical patent/EP0092629A1/de
Application granted granted Critical
Publication of EP0092629B1 publication Critical patent/EP0092629B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese

Definitions

  • the process which is the subject of the invention relates to a new method of manufacturing bars and tubes of low alloy steel, having in the raw state of hot transformation high mechanical characteristics, the elastic limit, the load. and the resilience being particularly high.
  • the method also relates to a method which makes it possible to significantly reduce the costs of transforming steel in the form of bars or tubes with high mechanical characteristics.
  • the invention also relates to bars and tubes having high mechanical characteristics in the raw state of hot rolling by virtue of the combination of a composition defined within precise ranges and a predominantly bainitic structure.
  • the invention relates to bars or tubes having mechanical characteristics at least equal to the minimum characteristics of grade N80 of the American Petroleum Institute, obtained by a production and transformation method much more economical than the usual methods. used.
  • the usual methods of manufacturing bars or tubes having mechanical characteristics corresponding to grade N80 of the American Petroleum Institute consist in developing a low-alloy steel such as steel according to standard AFNOR 40MD7.
  • This steel contains Z en mass; C 0.25 to 0.50; Mn 1.20 to 1.70; Mo 0.20 and the usual impurities.
  • this steel is transformed by hot rolling into bars of the desired section, for example round bars from 100 to 200 mm in diameter. In the raw hot rolling state, these bars generally have an elastic limit of around 750 MPa but a low resilience of less than 30 Joules / cm2, measured on KCU test pieces.
  • the steel After casting in the form of ingots or continuous casting bars, the steel is transformed under controlled conditions.
  • the roughing of the ingots, during blooming, is carried out in a conventional manner at a temperature of approximately 1200 to 1050 ° C.
  • the bars thus obtained, or else the continuous casting bars undergo a controlled rolling at a temperature between 1000 and 700 ° C. in a single hot operation until bars of the desired section are obtained, circular or not.
  • the raw hot rolling bar is drilled by hot drilling and then the tube blank obtained is hot rolled on a mandrel to the desired dimension.
  • This tempering is preferably carried out at a temperature between 550 and 700 ° C.
  • the high mechanical properties of the products obtained by the process according to the invention essentially result from the action of the hot rolling operation carried out, within defined temperature limits and with a well-defined wrought rate, on a steel whose composition is within the limits specified above. Thanks to its low carbon content, associated with a well-defined manganese content and a combination of additions of niobium, boron and aluminum, in critical proportions, it is possible to eliminate the conventional treatments which were considered compulsory to obtain these very specific mechanical characteristics.
  • a steel is produced containing in% by mass: C 0.085; If 0.452; Mn 1.520; Nb 0.060; Al 0.071; B 0.0049; N 0.007; Ni 0.136; Cr 0.167; Cu 0.228; S 0.028; P 0.017; remains Fe and usual impurities.
  • This steel is cast in 5.8-ton ingots. These ingots are preheated to 1230 ° C, then roughed out in blooming in 182 x 182 mm bars at a temperature between 1200 and 1050 ° C and then continuously rolled into 140 mm diameter round bars.
  • the inlet temperature is approximately 950 ° C and the temperature at the outlet of the last stand of the rolling mill is approximately 710 ° C.
  • 10 mm diameter test pieces for tensile tests as well as test pieces for resilience measurements of the long KCU type are taken from these bars, rough hot-rolled. These samples are taken 25 mm from the surface (axis of the test piece 0 10 mm located 25 mm below this surface).
  • the elastic limit is greater than 550 MPa and that the resilience is greater than 80 J / cm 2 .
  • micrographic examinations show that the structure of the bar is homogeneous and predominantly bainitic in all points. It is also possible to apply the method according to the invention to the production of bars of section other than circular, such as square or rectangular bars or of any section. In all cases, the rolling operation which makes it possible to obtain these bars must be carried out at a temperature of between 1000 and 700 ° C. and the rate of working must preferably reach at least 50X without intermediate reheating.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Articles (AREA)
  • Metal Extraction Processes (AREA)
EP82420154A 1982-04-22 1982-11-15 Verfahren zur Herstellung von Stäben und Röhren aus Stählen mit hohen mechanischen Eigenschaften Expired EP0092629B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82420154T ATE20479T1 (de) 1982-04-22 1982-11-15 Verfahren zur herstellung von staeben und roehren aus staehlen mit hohen mechanischen eigenschaften.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8207281 1982-04-22
FR8207281A FR2525503B1 (de) 1982-04-22 1982-04-22

Publications (2)

Publication Number Publication Date
EP0092629A1 true EP0092629A1 (de) 1983-11-02
EP0092629B1 EP0092629B1 (de) 1986-06-18

Family

ID=9273468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82420154A Expired EP0092629B1 (de) 1982-04-22 1982-11-15 Verfahren zur Herstellung von Stäben und Röhren aus Stählen mit hohen mechanischen Eigenschaften

Country Status (7)

Country Link
US (1) US4474627A (de)
EP (1) EP0092629B1 (de)
JP (1) JPS591656A (de)
AT (1) ATE20479T1 (de)
CA (1) CA1198614A (de)
DE (1) DE3271793D1 (de)
FR (1) FR2525503B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0370588A1 (de) * 1988-09-16 1990-05-30 MANNESMANN Aktiengesellschaft Verfahren zur Herstellung hochfester nahtloser Stahlrohre
FR2727981A1 (fr) * 1994-12-13 1996-06-14 Ascometal Sa Procede de fabrication d'une piece en acier de construction mecanique et piece ainsi fabriquee

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2135255C (en) * 1994-05-26 2000-05-16 William E. Heitmann Cold deformable, high strength, hot rolled bar and method for producing same
JP5229823B2 (ja) * 2009-09-25 2013-07-03 株式会社日本製鋼所 高強度高靭性鋳鋼材およびその製造方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2187922A1 (de) * 1972-06-13 1974-01-18 Sumitomo Metal Ind
SU522261A1 (ru) * 1975-03-25 1976-07-25 Центральный научно-исследовательский институт черной металлургии им.И.П.Бардина Низколегированна сталь
FR2400067A1 (fr) * 1977-08-12 1979-03-09 Kawasaki Steel Co Acier possedant une resistance elevee a la fissuration provoquee par l'hydrogene
GB2019439A (en) * 1978-04-05 1979-10-31 Nippon Steel Corp Process for producing high-tension bainitic steel having high toughness and excellent weldability

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513240A (en) * 1949-01-10 1950-06-27 Wheeling Steel Corp Welded steel pipe
FR1515961A (fr) * 1965-10-26 1968-03-08 Fuji Iron & Steel Co Ltd Procédés de fabrication d'acier à résistance élevée à l'effet d'entailles pour des structures soudées et nouveaux produits ainsi obtenus
NL170159C (nl) * 1973-06-04 1982-10-01 Estel Hoogovens Bv Werkwijze voor het vervaardigen van lasbaar staafmateriaal uit laag koolstofstaal door gecontroleerde koeling.
JPS5420931B2 (de) * 1973-09-10 1979-07-26
BE829089A (fr) * 1975-05-14 1975-11-14 Boulon en acier, a haute limite elastique
JPS52152814A (en) * 1976-06-14 1977-12-19 Nippon Steel Corp Thermo-mechanical treatment of seamless steel pipe
DE2635188A1 (de) * 1976-08-05 1978-02-09 Bosch Gmbh Robert Verfahren zur herstellung von hochfesten formteilen und dergleichen formteile
JPS5375114A (en) * 1976-12-17 1978-07-04 Nippon Steel Corp Manufacture of structural steel
JPS5397922A (en) * 1977-02-08 1978-08-26 Nippon Kokan Kk <Nkk> Manufacture of non-refined high tensile steel
JPS55107726A (en) * 1979-02-07 1980-08-19 Nippon Steel Corp Production of steel material of superior rupture characteristic
JPS5853708B2 (ja) * 1979-03-15 1983-11-30 住友金属工業株式会社 衝合部靭性の優れた溶接鋼管
JPS56166324A (en) * 1980-05-23 1981-12-21 Kawasaki Steel Corp Production of high-strength seamless steel pipe of good weldability for middle temperature region
JPS5945749B2 (ja) * 1980-07-17 1984-11-08 住友金属工業株式会社 パイプ用鋼材
US4354882A (en) * 1981-05-08 1982-10-19 Lone Star Steel Company High performance tubulars for critical oil country applications and process for their preparation
US4370178A (en) * 1981-06-30 1983-01-25 Republic Steel Corporation Method of making as-pierced tubular products

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2187922A1 (de) * 1972-06-13 1974-01-18 Sumitomo Metal Ind
SU522261A1 (ru) * 1975-03-25 1976-07-25 Центральный научно-исследовательский институт черной металлургии им.И.П.Бардина Низколегированна сталь
FR2400067A1 (fr) * 1977-08-12 1979-03-09 Kawasaki Steel Co Acier possedant une resistance elevee a la fissuration provoquee par l'hydrogene
GB2019439A (en) * 1978-04-05 1979-10-31 Nippon Steel Corp Process for producing high-tension bainitic steel having high toughness and excellent weldability

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0370588A1 (de) * 1988-09-16 1990-05-30 MANNESMANN Aktiengesellschaft Verfahren zur Herstellung hochfester nahtloser Stahlrohre
FR2727981A1 (fr) * 1994-12-13 1996-06-14 Ascometal Sa Procede de fabrication d'une piece en acier de construction mecanique et piece ainsi fabriquee
EP0717116A1 (de) * 1994-12-13 1996-06-19 ASCOMETAL (Société anonyme) Verfahren zum Herstellen eines Werkstückes aus Maschinenbaustahl und nach diesem Verfahren hergestelltes Werkstück

Also Published As

Publication number Publication date
ATE20479T1 (de) 1986-07-15
FR2525503A1 (de) 1983-10-28
JPS591656A (ja) 1984-01-07
CA1198614A (fr) 1985-12-31
EP0092629B1 (de) 1986-06-18
DE3271793D1 (en) 1986-07-24
US4474627A (en) 1984-10-02
FR2525503B1 (de) 1984-07-13

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