EP1984527A2 - Method of production of high-strength low-alloyed steel pipes - Google Patents
Method of production of high-strength low-alloyed steel pipesInfo
- 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
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
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CZ20050756A CZ299495B6 (en) | 2005-12-06 | 2005-12-06 | Process for producing high-strength low-alloy steel pipes |
PCT/CZ2006/000086 WO2007065380A2 (en) | 2005-12-06 | 2006-12-06 | Method of production of high-strength low-alloyed steel pipes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1984527A2 true EP1984527A2 (en) | 2008-10-29 |
EP1984527B1 EP1984527B1 (en) | 2013-11-06 |
Family
ID=37964880
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06818001.7A Not-in-force EP1984527B1 (en) | 2005-12-06 | 2006-12-06 | Method of production of high-strength low-alloyed steel pipes |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1984527B1 (en) |
CZ (1) | CZ299495B6 (en) |
WO (1) | WO2007065380A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103243275B (en) * | 2013-04-03 | 2015-06-03 | 北京交通大学 | Preparation method of bainite/martensite/austenite composite high-strength steel |
CN110508625A (en) * | 2019-10-17 | 2019-11-29 | 东北大学 | On-line Control cooling device and method for middle small-caliber hot rolling seamless steel |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6156233A (en) * | 1984-08-23 | 1986-03-20 | Nippon Steel Corp | Manufacture of ultrafine grain low alloyed hot rolled high tensile steel |
JPH0660346B2 (en) * | 1987-03-02 | 1994-08-10 | 日本鋼管株式会社 | High-strength steel pipe fitting manufacturing method |
CZ281082B6 (en) * | 1990-03-14 | 1996-06-12 | Nová Huť, A.S. | Process for producing seamless oil pipe resistant to brittle fracture in the presence of hydrogen sulfide |
JPH04276018A (en) * | 1991-03-01 | 1992-10-01 | Kobe Steel Ltd | Manufacture of door guard bar excellent in collapse resistant property |
JPH0596323A (en) * | 1991-10-07 | 1993-04-20 | Nippon Steel Corp | Manufacture of clap type resistance welded oil well pipe having excellent squeezing resistant characteristic |
SK278094B6 (en) * | 1992-05-27 | 1995-12-06 | Jaroslav Sedlarik | Device for continual measuring of mass ununiform of bundle of fibers |
JPH07246481A (en) * | 1994-03-10 | 1995-09-26 | Nippon Steel Corp | Production of high strength clad steel sheet |
CZ364496A3 (en) * | 1994-06-16 | 1998-03-18 | Mannesmann Ag | Process for producing seemless hot made tube |
FR2761699B1 (en) * | 1997-04-04 | 1999-05-14 | Ascometal Sa | STEEL AND METHOD FOR MANUFACTURING A BEARING PART |
US6866725B2 (en) * | 2000-02-28 | 2005-03-15 | Nippon Steel Corporation | Steel pipe excellent in formability and method of producing the same |
JP4608739B2 (en) * | 2000-06-14 | 2011-01-12 | Jfeスチール株式会社 | Manufacturing method of steel pipe for automobile door reinforcement |
-
2005
- 2005-12-06 CZ CZ20050756A patent/CZ299495B6/en not_active IP Right Cessation
-
2006
- 2006-12-06 WO PCT/CZ2006/000086 patent/WO2007065380A2/en active Application Filing
- 2006-12-06 EP EP06818001.7A patent/EP1984527B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2007065380A2 * |
Also Published As
Publication number | Publication date |
---|---|
EP1984527B1 (en) | 2013-11-06 |
CZ299495B6 (en) | 2008-08-13 |
WO2007065380A3 (en) | 2008-08-21 |
WO2007065380A2 (en) | 2007-06-14 |
CZ2005756A3 (en) | 2007-06-13 |
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