EP0092629B1 - 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
EP0092629B1
EP0092629B1 EP82420154A EP82420154A EP0092629B1 EP 0092629 B1 EP0092629 B1 EP 0092629B1 EP 82420154 A EP82420154 A EP 82420154A EP 82420154 A EP82420154 A EP 82420154A EP 0092629 B1 EP0092629 B1 EP 0092629B1
Authority
EP
European Patent Office
Prior art keywords
bars
tubes
weight
steel
hot
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
Application number
EP82420154A
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English (en)
French (fr)
Other versions
EP0092629A1 (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 in% by 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 of 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 / cm 2 , measured on KCU test pieces.
  • V up to 0.12% preferably between 0.060 and 0.12%
  • S up to a content of approximately 0.040 to 0.070% to improve the machinability.
  • alkaline earth metals such as Ca and / or Mg, and / or of rare earth metals to improve the isotropy of the mechanical characteristics.
  • said ingots or said bars are transformed under controlled conditions.
  • the roughing of the ingots, during blooming, is carried out in a conventional manner at a temperature of approximately 1,200 to 1,050 ° C.
  • the bars thus obtained, or else the continuous casting bars undergo a controlled rolling at a temperature of between 1000 and 700 ° C. in a single hot operation until bars of the desired section are obtained, circular or not, with a reduction rate of the initial section of at least 50%.
  • the raw hot rolling bar is pierced 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 temperature 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 in order to obtain these very specific mechanical characteristics.
  • This steel is cast in 5.8-ton ingots. These ingots are preheated to 1,230 ° C, then roughed out in blooming in 182 x 182 mm bars at a temperature between 1,200 and 1,050 ° 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 50% 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)

Claims (10)

1. Verfahren zum Herstellen von Stäben oder Rohren aus Stahl, die im rohen Warmwalzzustand ein vorwiegend feinbainitisches Gefüge, eine Elastizitätsgrenze über 550 MPa und eine Schlagzähigkeit über 80 J/cm2 aufweisen, dadurch gekennzeichnet, daß es die folgenden Stufen umfaßt :
- man erzeugt, in Block- oder Stabform, einen Stahl, der in Gew.% : 0,060 bis 0,120 C : 0,30 bis 0,70 Si; 1,30 bis 2,00 Mn ; 0,050 bis 0,120 Nb ; 0,0025 bis 0,0060 B ; 0,040 bis 0,080 AI ; ≤ 0,010 N ; ≤ 0,120 V ; gegebenenfalls 0,040 bis 0,070 S ; übliche Verunreinigungen, unter denen die Gesamtheit der metallischen Verunreinigungen, wie z. B. Ni, Cr, Cu, Mo, 1,0 nicht übersteigt; Rest Fe enthält ;
- man warmverformt diesen Block oder diesen Stab zu Stäben oder Rohren mit einem gesteuerten Endwalzen bei einer Temperatur im Bereich von 1 000 bis 700 °C in einer einzigen Hitze mit einem Reduktionsgrad des Anfangsquerschnitts von wenigstens 50 %.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Stahl in Gew.% : 0,080 bis 0,110 C und 1,50 bis 1,80 Mn enthält.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Stahl in Gew.% : 0,060 bis 0,120 V enthält.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Stahl einen Zusatz von in Gew.% : 0,040 bis 0.070 S enthält.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die durch Warmwalzen erhaltenen Stäbe anschließend auf einem Dorn in Form von Rohren warmgelocht werden.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die warmgewalzten Stäbe oder Rohre einem Anlassen bei einer Temperatur im Bereich von 550 bis 700 °C unterworfen werden.
7. Stäbe oder Rohre aus Stahl, die im rohen Warmwalzzustand ein vorwiegend bainitisches Gefüge mit feinen.Körnern, eine Elastizitätzgrenze, in 25 mm unter der Oberfläche, über 550 MPa und eine Schlagzähigkeit über 80 J/cm2 aufweisen, dadurch gekennzeichnet, daß sie in Gew.% : 0,060 bis 0,120 C ; 0,30 bis 0,70 Si ; 1,30 bis 2,00 Mn ; 0,050 bis 0,120 Nb ; 0,040 bis 0,080 Al ; 0,0025 bis 0,0060 B ; - 0,010 N ; ≤ 0,120 V ; gegebenenfalls 0,040 bis 0,070 S ; übliche Verunreinigungen, unter denen die Gesamtheit der metallischen Verunreinigungen, wie z. B. Ni, Cr, Cu, Mo, 1,0 nicht übersteigt; Rest Fe enthalten.
8. Stäbe oder Rohre nach Anspruch 6, dadurch gekennzeichnet, daß sie in Gew.% : 0,080 bis 0,110 C und 1,50 bis 1,80 Mn enthalten.
9. Stäbe oder Rohre nach Anspruch 8, dadurch gekennzeichnet, daß sie in Gew.% : 0,060 bis 0,120 V enthalten.
10. Stäbe oder Rohre nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß sie einen Zusatz von in Gew.% : 0,040 bis 0,070 S enthalten.
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 EP0092629A1 (de) 1983-11-02
EP0092629B1 true 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)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3832014C2 (de) * 1988-09-16 1994-11-24 Mannesmann Ag Verfahren zur Herstellung hochfester nahtloser Stahlrohre
CA2135255C (en) * 1994-05-26 2000-05-16 William E. Heitmann Cold deformable, high strength, hot rolled bar and method for producing same
FR2727981B1 (fr) * 1994-12-13 1997-01-10 Ascometal Sa Procede de fabrication d'une piece en acier de construction mecanique et piece ainsi fabriquee
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
GB1128527A (en) * 1965-10-26 1968-09-25 Fuji Iron & Steel Company Ltd Steel
FR2231758A1 (de) * 1973-06-04 1974-12-27 Hoogovens Ijmuiden Bv
DE2620449A1 (de) * 1975-05-14 1976-11-25 Centre Rech Metallurgique Stahlbolzen von hoher streckfestigkeit und verfahren zu seiner herstellung
DE2635188A1 (de) * 1976-08-05 1978-02-09 Bosch Gmbh Robert Verfahren zur herstellung von hochfesten formteilen und dergleichen formteile

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
US3830669A (en) * 1972-06-13 1974-08-20 Sumitomo Metal Ind Process for manufacturing a cold-rolled high strength steel sheet
JPS5420931B2 (de) * 1973-09-10 1979-07-26
SU522261A1 (ru) * 1975-03-25 1976-07-25 Центральный научно-исследовательский институт черной металлургии им.И.П.Бардина Низколегированна сталь
JPS52152814A (en) * 1976-06-14 1977-12-19 Nippon Steel Corp Thermo-mechanical treatment of seamless steel pipe
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
JPS5431019A (en) * 1977-08-12 1979-03-07 Kawasaki Steel Co Steel material having good resistance to hydrogenninduceddcracking
JPS54132421A (en) * 1978-04-05 1979-10-15 Nippon Steel Corp Manufacture of high toughness bainite high tensile steel plate with superior weldability
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
GB1128527A (en) * 1965-10-26 1968-09-25 Fuji Iron & Steel Company Ltd Steel
FR2231758A1 (de) * 1973-06-04 1974-12-27 Hoogovens Ijmuiden Bv
DE2620449A1 (de) * 1975-05-14 1976-11-25 Centre Rech Metallurgique Stahlbolzen von hoher streckfestigkeit und verfahren zu seiner herstellung
DE2635188A1 (de) * 1976-08-05 1978-02-09 Bosch Gmbh Robert Verfahren zur herstellung von hochfesten formteilen und dergleichen formteile

Also Published As

Publication number Publication date
DE3271793D1 (en) 1986-07-24
JPS591656A (ja) 1984-01-07
ATE20479T1 (de) 1986-07-15
FR2525503A1 (de) 1983-10-28
CA1198614A (fr) 1985-12-31
FR2525503B1 (de) 1984-07-13
EP0092629A1 (de) 1983-11-02
US4474627A (en) 1984-10-02

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