EP0845544A1 - Stahlprodukt aus bainitischem Stahl sowie Verfahren zur Herstellung des Stahlproduktes - Google Patents

Stahlprodukt aus bainitischem Stahl sowie Verfahren zur Herstellung des Stahlproduktes Download PDF

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Publication number
EP0845544A1
EP0845544A1 EP97402787A EP97402787A EP0845544A1 EP 0845544 A1 EP0845544 A1 EP 0845544A1 EP 97402787 A EP97402787 A EP 97402787A EP 97402787 A EP97402787 A EP 97402787A EP 0845544 A1 EP0845544 A1 EP 0845544A1
Authority
EP
European Patent Office
Prior art keywords
steel
steel product
temperature
chemical composition
product
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
EP97402787A
Other languages
English (en)
French (fr)
Other versions
EP0845544B1 (de
Inventor
Jacques Bellus
Gilles Pierson
Claude Pichard
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.)
Ascometal SA
Original Assignee
Ascometal 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 Ascometal SA filed Critical Ascometal SA
Publication of EP0845544A1 publication Critical patent/EP0845544A1/de
Application granted granted Critical
Publication of EP0845544B1 publication Critical patent/EP0845544B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite

Definitions

  • the present invention relates to a steel product having high mechanical properties, good impact resistance and good machinability, the steel product can be used to manufacture directly by machining mechanical steel parts with high mechanical characteristics and good impact resistance.
  • Step product means a steel product obtained by rolling with hot of a semi-finished product such as an ingot, a bloom, a billet or a slab, possibly having undergone a heat treatment after the hot rolling, and being, for example, in the form of a bar round or square section, of a profile, a wire, a sheet, a plate, or even in the form of a seamless tube.
  • the tempering generates risks of spotting which makes the manufacture of the steel product delicate, this manufacture being all the more delicate as the mechanical characteristics sought are high.
  • the need for income after quenching lengthens the manufacturing process, which increases costs.
  • the relatively high carbon content, necessary to obtain such characteristics mechanical makes machining difficult, in particular because, during tempering, very hard carbides can form.
  • the object of the present invention is to remedy these drawbacks by proposing a means for manufacturing a mechanical mechanical part of which one at least part has both a tensile strength greater than 1000 MPa, very good ductility, good machinability, these properties being obtained without the need for treatment thermal income.
  • the invention relates to a method for manufacturing a steel mechanical part, the mechanical characteristics of which at 20 ° C. are: Rm ⁇ 1000 MPa Rp0.2 / Rm ⁇ 0.78 Z ⁇ 55% Km ⁇ 45 J / cm 2 according to which a steel product according to the invention is supplied and a machining is carried out.
  • This steel is cast in the form of a semi-finished product such as an ingot, a bloom, a billet or a slab which is hot rolled after reheating at a temperature above 1000 ° C and below or equal to 1250 ° C to form an iron and steel product such as a round or square bar, a profile, a plate, a wire, a seamless tube or a sheet metal.
  • the steel product is subjected to a heat treatment to give it a bainitic structure having the desired mechanical characteristics, namely: Rm ⁇ 1000 MPa Rp0.2 / Rm ⁇ 0.78 Z ⁇ 55% Km ⁇ 45 J / cm 2 Km being Mesnager resilience.
  • the mechanical part is then machined in the steel product, and there is no need for additional heat treatment.
  • the second embodiment includes reheating additional but it has the advantage of leading to a greater refinement of the grain, which is favorable in particular to the impact resistance and to the ductility.
  • a mechanical part was made consisting of a solid axis comprising two cylindrical parts of diameter 48 mm and 46 mm, from a steel steel product according to the invention.
  • This steel was hot rolled and then subjected to heat treatment oil quenching followed by tempering.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Coating With Molten Metal (AREA)
EP97402787A 1996-11-26 1997-11-20 Stahlprodukt aus bainitischem Stahl sowie Verfahren zur Herstellung des Stahlproduktes Expired - Lifetime EP0845544B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9614434A FR2756298B1 (fr) 1996-11-26 1996-11-26 Acier et procede pour la fabrication d'une piece de mecanique ayant une structure bainitique
FR9614434 1996-11-26

Publications (2)

Publication Number Publication Date
EP0845544A1 true EP0845544A1 (de) 1998-06-03
EP0845544B1 EP0845544B1 (de) 2003-01-02

Family

ID=9498012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97402787A Expired - Lifetime EP0845544B1 (de) 1996-11-26 1997-11-20 Stahlprodukt aus bainitischem Stahl sowie Verfahren zur Herstellung des Stahlproduktes

Country Status (6)

Country Link
EP (1) EP0845544B1 (de)
AT (1) ATE230443T1 (de)
DE (1) DE69718132T2 (de)
ES (1) ES2190514T3 (de)
FR (1) FR2756298B1 (de)
NO (1) NO975392L (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2802607A1 (fr) 1999-12-15 2001-06-22 Inst Francais Du Petrole Conduite flexible comportant des armures en acier bas carbone
EP1138796A1 (de) * 2000-03-29 2001-10-04 Usinor Hochfester warmgewalzter Stahl mit hoher Streckgrenze zur Verwendung in Kraftfahrzeugen
US6818072B2 (en) * 2001-07-19 2004-11-16 Mitsubishi Heavy Industries, Ltd. High-strength heat-resistant steel, process for producing the same, and process for producing high-strength heat-resistant pipe
EP2103704A1 (de) 2008-03-10 2009-09-23 Swiss Steel AG Warmgewalztes Langprodukt und Verfahren zu dessen Herstellung
FR2958660A1 (fr) * 2010-04-07 2011-10-14 Ascometal Sa Acier pour pieces mecaniques a hautes caracteristiques et son procede de fabrication.
EP2453027A1 (de) 2010-11-10 2012-05-16 Swiss Steel AG Warmumgeformtes Produkt und Verfahren zu dessen Herstellung
CN1860249B (zh) * 2003-09-30 2012-09-19 新日本制铁株式会社 焊接性和延展性优良的高屈服比高强度薄钢板及高屈服比高强度热浸镀锌薄钢板、以及高屈服比高强度合金化热浸镀锌薄钢板及其制造方法
WO2013117953A1 (en) * 2012-02-10 2013-08-15 Ascometal Process for making a steel part, and steel part so obtained

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160138142A1 (en) 2014-11-18 2016-05-19 Air Liquide Large Industries U.S. Lp Materials of construction for use in high pressure hydrogen storage in a salt cavern

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5524932A (en) * 1978-08-08 1980-02-22 Nippon Steel Corp Manufacture of bainite tough hardening steel
JPS59110721A (ja) * 1982-12-14 1984-06-26 Nippon Steel Corp 硫化物応力腐食割れ抵抗性に優れた低合金高張力鋼の製造方法
EP0191873A1 (de) * 1985-02-16 1986-08-27 Ovako Steel Oy Ab Verfahren und legierter Stahl zum Herstellen hochfester Schmiedestücke
GB2186594A (en) * 1986-02-13 1987-08-19 Hunting Oilfield Services Ltd Steel alloys
JPH0565540A (ja) * 1991-09-10 1993-03-19 Nissan Motor Co Ltd 高強度ボルトの製造方法
EP0550294A1 (de) * 1991-12-30 1993-07-07 Ascometal Rohfabrikate grosser Länge für Herstellungsverfahren durch Kaltumformen, insbesondere für Kaltstauchen von formgebend bearbeitete Erzeugnisse wie Bolzen, und Verfahren zur Herstellung dieser kaltgeformten Gegenstände
JPH06248341A (ja) * 1993-02-23 1994-09-06 Sumitomo Metal Ind Ltd 非調質鋼からの高強度高靱性鋼の製造方法
EP0775756A1 (de) * 1995-11-27 1997-05-28 ASCOMETAL (Société anonyme) Stahl für die Herstellung von Schmiedestücken mit bainitischer Struktur, und Herstellungsverfahren dieser Erzeugnisse

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5524932A (en) * 1978-08-08 1980-02-22 Nippon Steel Corp Manufacture of bainite tough hardening steel
JPS59110721A (ja) * 1982-12-14 1984-06-26 Nippon Steel Corp 硫化物応力腐食割れ抵抗性に優れた低合金高張力鋼の製造方法
EP0191873A1 (de) * 1985-02-16 1986-08-27 Ovako Steel Oy Ab Verfahren und legierter Stahl zum Herstellen hochfester Schmiedestücke
GB2186594A (en) * 1986-02-13 1987-08-19 Hunting Oilfield Services Ltd Steel alloys
JPH0565540A (ja) * 1991-09-10 1993-03-19 Nissan Motor Co Ltd 高強度ボルトの製造方法
EP0550294A1 (de) * 1991-12-30 1993-07-07 Ascometal Rohfabrikate grosser Länge für Herstellungsverfahren durch Kaltumformen, insbesondere für Kaltstauchen von formgebend bearbeitete Erzeugnisse wie Bolzen, und Verfahren zur Herstellung dieser kaltgeformten Gegenstände
JPH06248341A (ja) * 1993-02-23 1994-09-06 Sumitomo Metal Ind Ltd 非調質鋼からの高強度高靱性鋼の製造方法
EP0775756A1 (de) * 1995-11-27 1997-05-28 ASCOMETAL (Société anonyme) Stahl für die Herstellung von Schmiedestücken mit bainitischer Struktur, und Herstellungsverfahren dieser Erzeugnisse

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 8431, Derwent World Patents Index; Class M27, AN 84-192885, XP002057351 *
PATENT ABSTRACTS OF JAPAN vol. 004, no. 054 (C - 008) 23 April 1980 (1980-04-23) *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 382 (C - 1085) 19 July 1993 (1993-07-19) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 647 (C - 1283) 8 December 1994 (1994-12-08) *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2802607A1 (fr) 1999-12-15 2001-06-22 Inst Francais Du Petrole Conduite flexible comportant des armures en acier bas carbone
EP1138796A1 (de) * 2000-03-29 2001-10-04 Usinor Hochfester warmgewalzter Stahl mit hoher Streckgrenze zur Verwendung in Kraftfahrzeugen
FR2807068A1 (fr) * 2000-03-29 2001-10-05 Usinor Acier lamine a chaud a tres haute limite d'elasticite et resistance mecanique utilisable notamment pour la realisation de piece de vehicules automobiles
US6818072B2 (en) * 2001-07-19 2004-11-16 Mitsubishi Heavy Industries, Ltd. High-strength heat-resistant steel, process for producing the same, and process for producing high-strength heat-resistant pipe
CN1860249B (zh) * 2003-09-30 2012-09-19 新日本制铁株式会社 焊接性和延展性优良的高屈服比高强度薄钢板及高屈服比高强度热浸镀锌薄钢板、以及高屈服比高强度合金化热浸镀锌薄钢板及其制造方法
EP2103704A1 (de) 2008-03-10 2009-09-23 Swiss Steel AG Warmgewalztes Langprodukt und Verfahren zu dessen Herstellung
CN102985569A (zh) * 2010-04-07 2013-03-20 阿斯科麦托有限公司 由高特性的钢制成的机械部件及其制备方法
FR2958660A1 (fr) * 2010-04-07 2011-10-14 Ascometal Sa Acier pour pieces mecaniques a hautes caracteristiques et son procede de fabrication.
WO2011124851A3 (fr) * 2010-04-07 2015-06-25 Ascometal Pièce mécanique en acier à hautes caractéristiques et son procédé de fabrication
CN102985569B (zh) * 2010-04-07 2015-08-05 阿斯科麦托有限公司 由高特性的钢制成的机械部件及其制备方法
EP2453026A1 (de) 2010-11-10 2012-05-16 Swiss Steel AG Warmumgeformtes Stahlprodukt und Verfahren zu dessen Herstellung
EP2453027A1 (de) 2010-11-10 2012-05-16 Swiss Steel AG Warmumgeformtes Produkt und Verfahren zu dessen Herstellung
WO2013117953A1 (en) * 2012-02-10 2013-08-15 Ascometal Process for making a steel part, and steel part so obtained

Also Published As

Publication number Publication date
FR2756298B1 (fr) 1998-12-24
NO975392D0 (no) 1997-11-24
ES2190514T3 (es) 2003-08-01
FR2756298A1 (fr) 1998-05-29
DE69718132T2 (de) 2003-10-09
ATE230443T1 (de) 2003-01-15
NO975392L (no) 1998-05-27
DE69718132D1 (de) 2003-02-06
EP0845544B1 (de) 2003-01-02

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