EP1984527A2 - Procede de production de conduites en acier faiblement allie a haute resistance - Google Patents

Procede de production de conduites en acier faiblement allie a haute resistance

Info

Publication number
EP1984527A2
EP1984527A2 EP06818001A EP06818001A EP1984527A2 EP 1984527 A2 EP1984527 A2 EP 1984527A2 EP 06818001 A EP06818001 A EP 06818001A EP 06818001 A EP06818001 A EP 06818001A EP 1984527 A2 EP1984527 A2 EP 1984527A2
Authority
EP
European Patent Office
Prior art keywords
delay
sec
temperature range
temperature
production
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
EP06818001A
Other languages
German (de)
English (en)
Other versions
EP1984527B1 (fr
Inventor
Zbysek Novy
Libor Kraus
Jozef Zrnik
Stanislav Nemecek
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.)
Comtes FHT AS
Original Assignee
Comtes Fht Sro
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 Comtes Fht Sro filed Critical Comtes Fht Sro
Publication of EP1984527A2 publication Critical patent/EP1984527A2/fr
Application granted granted Critical
Publication of EP1984527B1 publication Critical patent/EP1984527B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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 invention concerns a method of production of high-strength low-alloyed steel pipes by drawing, extrusion, rolling or by combination of these steps from steels with controlled multi-phase microstructures.
  • the object of the invention as described in the document no. US 2003116238 concerns high strength steel tubes with excellent material formability produced for hydroforming and similar forming processes.
  • Chemical composition of the tube material is listed in weight per cent: 0.0005 - 0.30 % C, 0.001 - 2.0 % Si, 0.01 - 3.0 % Mn and appropriate amounts of alloying elements if needed.
  • the balance consists of iron and unavoidable amount of additional elements.
  • the steel tube composition is as follows: 0.05 - 0.3 % C, 1.8 - 4 % Mn.
  • the material with silicon and aluminium is rolled to reduce its diameter, where the overall diameter reduction is no less than 20% and the finish rolling temperature in diameter-reduction rolling is no higher than 800°C.
  • the microstructure obtained in this fashion consisting of martensite and/or bainite or even ferrite was achieved as a product of deformed austenite transformation.
  • the solution consists in a material for tubes with tensile strength above 1,000 MPa and excellent three-point bending properties.
  • the chemical composition of the steel tubes as described in this document may additionally contain at least one of the following group of elements: Cu, Ni, Cr and Mo or at least one of the following group of elements: Nb, V, Ti and B or at least one element of the group of rare earth metals and Ca.
  • the pipes are produced by drawing, extrusion, rolling or combination of these processes from steels with multi-phase microstructure.
  • the essence of the solution consists in the fact that the pipes are produced by a
  • thermomechanical treatment and/or intercritical heat treatment are thermomechanical treatment and/or intercritical heat treatment
  • thermomechanical treatment consisting in hot rolling or hot extrusion, where the finishing temperature is between 600 and I 5 OOO 0 C.
  • Controlled cooling is the next process where the delay in the temperature range of 700 to 45O 0 C is no more than 50 seconds and the delay in the range of 450 to 350 0 C is at least 120 sec.
  • Another alternative solution consists in the following sequence: hot rolling or hot extrusion, cooling, intercritical heat treatment with the maxium temperature between 770 and 850°C. Upon soaking at this temperature, controlled cooling is applied with delay in the temperature range of 700 to 450°C of no more than 50 sec and the delay in the temperature range of 450 to 35O 0 C is at least 120 sec.
  • Another alternative solution consists in the following sequence: hot rolling or hot extrusion, cooling, drawing and intercritical heat treatment with the maximum temperature in the range of 770 to 850 0 C.
  • controlled cooling is applied with delay in the temperature range of 700 to 450 0 C of no more than 50 sec and the delay in the temperature range of 450 to 350 0 C is at least 120 sec.
  • the pipes were made from steels with multiphase microstrucrures by means of rolling, controlled cooling and subsequent drawing.
  • thermomechanical treatment has been used for production of pipes. This process involved hot rolling with finishing temperature between 800 and 900 0 C.
  • the processing is concluded with a single-pass drawing, i.e. without interstage annealing.
  • the pipes were made from steels with multiphase microstructures by means of rolling, drawing and intercritical heat treatment.
  • the procedure used for the tube production consisted in the procedure involving the sequence of hot rolling or hot extrusion, cooling, drawing and intercritical heat treatment with heating to 800°C.
  • controlled cooling is applied with delay in the temperature range of 700 to 450°C of 15 sec and the delay in the temperature range of 450 to 350°C is
  • a pipe produced in this fashion can be used for forming by internal pressure, which requires that the material shows high plasticity.
  • the required amount of plasticity has been obtained by the intercritical heat treatment, which produced the multiphase microstructure.
  • the proposed solution is practically usable in production of transport vehicles, in particular cars, buses and rail vehicles.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

La présente invention concerne un procédé de production de conduites en acier faiblement allié à haute résistance comprenant un traitement thermomécanique et/ou un traitement thermique inter-critique, les conduites étant produites en premier lieu par un laminage à chaud ou une extrusion à chaud, puis par un processus de refroidissement et, enfin, par un emboutissage et/ou un formage sous une pression interne et/ou un cintrage des conduites. Le procédé de traitement thermomécanique comprend un laminage à chaud ou une extrusion à chaud à une température de formage de finition comprise entre 600 et 1000 °C et un refroidissement régulé ultérieur avec un retard maximum de 50 secondes dans une plage de température de 700 à 4500 °C et un retard d'au moins 120 secondes dans la plage de température de 450 à 350 °C. Le procédé de laminage à chaud ou d'extrusion à chaud est suivi de la séquence suivante : un processus de refroidissement, un traitement thermique intercritique à une température maximale située entre 770 et 850 °C ; après un trempage à cette température, un refroidissement régulé avec un retard maximum de 50 secondes dans la plage de température de 700 à 450 °C et un retard d'au moins 120 secondes dans la plage de température de 450 à 350 °C.
EP06818001.7A 2005-12-06 2006-12-06 Procede de production de conduites en acier faiblement allie a haute resistance Not-in-force EP1984527B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ20050756A CZ299495B6 (cs) 2005-12-06 2005-12-06 Zpusob výroby vysokopevných nízkolegovaných ocelových trubek
PCT/CZ2006/000086 WO2007065380A2 (fr) 2005-12-06 2006-12-06 Procede de production de conduites en acier faiblement allie a haute resistance

Publications (2)

Publication Number Publication Date
EP1984527A2 true EP1984527A2 (fr) 2008-10-29
EP1984527B1 EP1984527B1 (fr) 2013-11-06

Family

ID=37964880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06818001.7A Not-in-force EP1984527B1 (fr) 2005-12-06 2006-12-06 Procede de production de conduites en acier faiblement allie a haute resistance

Country Status (3)

Country Link
EP (1) EP1984527B1 (fr)
CZ (1) CZ299495B6 (fr)
WO (1) WO2007065380A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103243275B (zh) * 2013-04-03 2015-06-03 北京交通大学 一种贝氏体/马氏体/奥氏体复相高强钢的制备方法
CN110508625B (zh) * 2019-10-17 2024-07-26 东北大学 用于中小口径热轧无缝钢管的在线控制冷却装置及方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6156233A (ja) * 1984-08-23 1986-03-20 Nippon Steel Corp 超細粒低合金熱延高張力鋼の製造方法
JPH0660346B2 (ja) * 1987-03-02 1994-08-10 日本鋼管株式会社 高強度鋼管継手の製造方法
CZ281082B6 (cs) * 1990-03-14 1996-06-12 Nová Huť, A.S. Olejářská bezešvá trubka
JPH04276018A (ja) * 1991-03-01 1992-10-01 Kobe Steel Ltd 圧壊特性に優れたドアガードバーの製造方法
JPH0596323A (ja) * 1991-10-07 1993-04-20 Nippon Steel Corp 圧潰特性に優れた複層型電縫油井管の製造方法
SK278094B6 (en) * 1992-05-27 1995-12-06 Jaroslav Sedlarik Device for continual measuring of mass ununiform of bundle of fibers
JPH07246481A (ja) * 1994-03-10 1995-09-26 Nippon Steel Corp 高強度クラッド鋼板の製造方法
ES2128736T3 (es) * 1994-06-16 1999-05-16 Mannesmann Ag Procedimiento para la produccion de un tubo sin costura acabado en caliente.
FR2761699B1 (fr) * 1997-04-04 1999-05-14 Ascometal Sa Acier et procede pour la fabrication d'une piece pour roulement
EP1264910B1 (fr) * 2000-02-28 2008-05-21 Nippon Steel Corporation Tube d'acier facile a former et procede de production de ce dernier
JP4608739B2 (ja) * 2000-06-14 2011-01-12 Ｊｆｅスチール株式会社 自動車ドア補強用鋼管の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007065380A2 *

Also Published As

Publication number Publication date
WO2007065380A3 (fr) 2008-08-21
CZ299495B6 (cs) 2008-08-13
CZ2005756A3 (cs) 2007-06-13
WO2007065380A2 (fr) 2007-06-14
EP1984527B1 (fr) 2013-11-06

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