EP0845544B1 - 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
EP0845544B1
EP0845544B1 EP97402787A EP97402787A EP0845544B1 EP 0845544 B1 EP0845544 B1 EP 0845544B1 EP 97402787 A EP97402787 A EP 97402787A EP 97402787 A EP97402787 A EP 97402787A EP 0845544 B1 EP0845544 B1 EP 0845544B1
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EP
European Patent Office
Prior art keywords
steel
steel product
temperature
product
chemical composition
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 - Lifetime
Application number
EP97402787A
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English (en)
French (fr)
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EP0845544A1 (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
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Ascometal SA
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Publication of EP0845544A1 publication Critical patent/EP0845544A1/de
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Publication of EP0845544B1 publication Critical patent/EP0845544B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C21D8/02—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 having 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 obtained without the need for treatment thermal income.
  • the subject of the invention is a steel product such as, for example, a round or square bar, a seamless tube, a plate or a sheet, having a bainitic structure, and, at 20 ° C., a resistance tensile Rm ⁇ 1000 MPa, a yield strength to tensile strength ratio Rp0,2 / Rm ⁇ 0.78, a necking Z ⁇ 55% and a resilience Mesnager Km ⁇ 45 J / cm 2 , said steel product consisting of a steel whose chemical composition comprises, by weight: 0.06% ⁇ C ⁇ 0.11% 1% ⁇ Mn ⁇ 1.7% 0.15% ⁇ If ⁇ 0.40% 0.025% ⁇ S ⁇ 0.10% P ⁇ 0.025% 0% ⁇ Ni ⁇ 0.25% 0.5% ⁇ Cr ⁇ 1.20% 0.08% ⁇ Mo ⁇ 0.13% 0% ⁇ Cu ⁇ 0.25% 0.003% ⁇ Al ⁇ 0.035% 0% ⁇ Ti ⁇ 0.035%
  • the characteristic dimension of the steel product is between 10 mm and 50 mm.
  • the invention relates to a method of manufacturing a mechanical mechanical part of steel whose mechanical characteristics 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.
  • the chemical composition must satisfy the relationship: Mn + Cr + Mo ⁇ 2.1%
  • 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 a steel product such as a round or square section 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 first embodiment has the advantage of not comprising any reheating after rolling.
  • the second embodiment includes reheating additional but it has the advantage of leading to a greater refinement of the grain, which is particularly favorable to impact resistance and ductility.
  • the characteristic dimension of the steel product i.e. the dimension that determines the distribution of cooling rates in the mass, between 10 mm and 50 mm.
  • This characteristic dimension is, for example, for a round bar, the diameter; for a section bar square, the length of one side of the square; for a plate or a dish, the thickness.
  • 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 in accordance with the invention.
  • the steel was rolled in the form a 49 mm diameter round bar, after having heated it to 1180 ° C.
  • the end of rolling temperature was 1020 ° C.
  • machining was carried out by removing chips using a tool comprising a carbide plate coated with Ti (C, N) + Al 2 O 3 , up to 48 mm for the part main and 46 mm for the remaining part, did not present any particular difficulties.
  • the steel was hot rolled to obtain a dish and the end of rolling temperature was 1010 ° C., then it was cooled from 980 ° C. to 58 ° C., ie Ms - 405 ° C., at the average cooling rate of 0.75 ° C / s, before being reheated to the temperature of 940 ° C, i.e. Ac 3 + 72 ° C, then cooled to 28 ° C, i.e. Bs - 601 ° C, at the average cooling rate of 39 ° C / s.
  • the dish was machined without difficulty by cutting to length, then machined, also without difficulty, to drill fixing holes for 10 mm diameter with a 10 mm diameter drill with inserts made of HSCO 6-5-2-5 high-alloy steel coated with TiN.
  • This steel was hot rolled and then subjected to heat treatment oil quenching followed by tempering.
  • the austenitization and income had to be adjusted, the first to 875 ° C and the second to 590 ° C, to obtain the same hardness as with the steel according to the invention, namely 330 HB.

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  • 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)

Claims (5)

  1. Walzstahlprodukt, gekennzeichnet durch eine bainitische Struktur und dadurch, dass seine mechanischen Eigenschaften bei 20°C sind: Rm ≥ 1000 MPa Rp0,2/Rm ≥ 0,78 Z ≥ 55% Km ≥ 45 J/cm2 sowie dadurch, dass es aus einem Stahl besteht, dessen chemische Zusammensetzung in Gew% umfasst: 0,06% ≤ C ≤ 0,11% 1% ≤ Mn ≤ 1,7% 0,15% ≤ Si ≤ 0,40% 0,025% ≤ S ≤ 0,10% P ≤ 0,025% 0% ≤ Ni ≤ 0,25% 0,5% ≤ Cr ≤ 1,20% 0,08% ≤ Mo ≤ 0,13% 0% ≤ Cu ≤ 0,25% 0,003% ≤ Al ≤ 0,035% 0% ≤ Ti ≤ 0,035% 0% ≤ V ≤ 0,10% 0% ≤ Nb ≤ 0,06% 0,0008% ≤ B ≤ 0,0040% 0,0060% ≤ N ≤ 0,011% und gegebenenfalls ein oder mehrere Elemente, ausgewählt aus bis zu 0,010% Te, bis zu 0,025% Se, bis zu 0,13% Bi, bis zu 0,090% Pb, bis zu 0,0040% Ca, wobei der Rest aus Eisen und aus der Verarbeitung stammenden Verunreinigungen stammt, wobei die chemische Zusammensetzung zudem die Beziehungen erfüllt: Mn + Cr + Mo ≥ 2,1% 0,015% ≤ V + Nb + Ti ≤ 0,13% Al + Ti ≥ 0,020% Mn/S ≥ 12
  2. Stahlprodukt nach Anspruch 1, dadurch gekennzeichnet, dass seine charakteristischen Abmessungen von 10 mm bis 50 mm reichen.
  3. Verfahren zur Herstellung eines Stahlproduktes nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass:
    ein Zwischenerzeugnis aus Stahl erhalten wird, dessen chemische Zusammensetzung in Gew% umfasst: 0,06% ≤ C ≤ 0,11% 1% ≤ Mn ≤ 1,7% 0,15% ≤ Si ≤ 0,40% 0,025% ≤ S ≤ 0,10% P ≤ 0,025% 0% ≤ Ni ≤ 0,25% 0,5% ≤ Cr ≤ 1,20% 0,08% ≤ Mo ≤ 0,13% 0% ≤ Cu ≤ 0,25% 0,003% ≤ Al ≤ 0,035% 0% ≤ Ti ≤ 0,035% 0% ≤ V ≤ 0,10% 0% ≤ Nb ≤ 0,06% 0,0008% ≤ B ≤ 0,0040% 0,0060% ≤ N ≤ 0,011% und gegebenenfalls ein oder mehrere Elemente, ausgewählt aus bis zu 0,010% Te, bis zu 0,025% Se, bis zu 0,13% Bi, bis zu 0,090% Pb, bis zu 0,0040% Ca, wobei der Rest aus Eisen und aus der Verarbeitung stammenden Verunreinigungen stammt, wobei die chemische Zusammensetzung zudem die Beziehungen erfüllt: Mn + Cr + Mo ≥ 2,1% 0,015% ≤ V + Nb + Ti ≤ 0,13% Al + Ti ≥ 0,020% Mn/S ≥ 12,
    das Zwischenerzeugnis bis auf eine Temperatur über 1000°C erhitzt und gewalzt wird, um ein Stahlprodukt herzustellen,
    das Stahlprodukt direkt nach dem Walzen mit einer mittleren Abkühlgeschwindigkeit über oder gleich 0,5°C/s bis auf eine Temperatur unter oder gleich Ms - 350° gekühlt wird, wobei Ms die Maximaltemperatur ist, bei der die martensitische Umwandlung des Stahls beginnt,
    das Stahlprodukt erneut bis auf eine Temperatur über Ac3 und zwischen 910°C und 980°C erhitzt wird
    und es mit einer mittleren Abkühlgeschwindigkeit zwischen 17°C/s und 150°C/s bis auf eine Temperatur unter oder gleich Bs - 450° gekühlt wird und man es dann bis auf Umgebungstemperatur abkühlen lässt.
  4. Verfahren zur Herstellung eines Stahlproduktes nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, dass:
    ein Zwischenerzeugnis aus Stahl erhalten wird, dessen chemische Zusammensetzung in Gew% umfasst: 0,06% ≤ C ≤ 0,11% 1% ≤ Mn ≤ 1,7% 0,15% ≤ Si ≤ 0,40% 0,025% ≤ S ≤ 0,10% P ≤ 0,025% 0% ≤ Ni ≤ 0,25% 0,5% ≤ Cr ≤ 1,20% 0,08% ≤ Mo ≤ 0,13% 0% ≤ Cu ≤ 0,25% 0,003% ≤ Al ≤ 0,035% 0% ≤ Ti ≤ 0,035% 0% ≤ V ≤ 0,10% 0% ≤ Nb ≤ 0,06% 0,0008% ≤ B ≤ 0,0040% 0,0060% ≤ N ≤ 0,011% und gegebenenfalls ein oder mehrere Elemente, ausgewählt aus bis zu 0,010% Te, bis zu 0,025% Se, bis zu 0,13% Bi, bis zu 0,090% Pb, bis zu 0,0040% Ca, wobei der Rest aus Eisen und aus der Verarbeitung stammenden Verunreinigungen stammt, wobei die chemische Zusammensetzung zudem die Beziehungen erfüllt : Mn + Cr + Mo ≥ 2,1% 0,015% ≤ V + Nb + Ti ≤ 0,13% Al + Ti ≥ 0,020% Mn/S ≥ 12,
    das Zwischenerzeugnis bis auf eine Temperatur über 1000°C erhitzt und gewalzt wird, um ein Stahlprodukt herzustellen, das man auf natürliche Weise bis auf eine Temperatur zwischen 920°C und 980°C abkühlen lässt,
    und das Stahlprodukt mit einer mittleren Abkühlgeschwindigkeit zwischen 17°C/s und 150°C/s bis auf eine Temperatur unter oder gleich Bs - 400° gekühlt wird, wobei Bs die Temperatur bei Beginn der bainitischen Umwandlung des Stahls bei der wirksamen Abkühlgeschwindigkeit ist, und man es dann bis auf Umgebungstemperatur abkühlen lässt.
  5. Verfahren zur Herstellung eines Maschinenteils aus Stahl, dessen mechanische Eigenschaften bei 20°C sind: Rm ≥ 1000 MPa Rp0,2/Rm ≥ 0,78 Z ≥ 55% Km ≥ 45 J/cm2, dadurch gekennzeichnet, dass ein Stahlprodukt nach Anspruch 1 erhalten wird und dadurch, dass eine Bearbeitung durchgeführt wird.
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
FR9614434 1996-11-26
FR9614434A FR2756298B1 (fr) 1996-11-26 1996-11-26 Acier et procede pour la fabrication d'une piece de mecanique ayant une structure bainitique

Publications (2)

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

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2802607B1 (fr) 1999-12-15 2002-02-01 Inst Francais Du Petrole Conduite flexible comportant des armures en acier bas carbone
FR2807068B1 (fr) * 2000-03-29 2002-10-11 Usinor Acier lamine a chaud a tres haute limite d'elasticite et resistance mecanique utilisable notamment pour la realisation de piece de vehicules automobiles
JP2003096534A (ja) * 2001-07-19 2003-04-03 Mitsubishi Heavy Ind Ltd 高強度耐熱鋼、高強度耐熱鋼の製造方法、及び高強度耐熱管部材の製造方法
ES2391164T3 (es) * 2003-09-30 2012-11-22 Nippon Steel Corporation Chapa delgada de acero laminado en frío, de alta resistencia, con alto límite de elasticidad, y superior ductilidad y soldabilidad, chapa delgada de acero galvanizado por inmersión en caliente, de alta resistencia, con alto límite de elasticidad, chapa delgada de acero galvanizado y recocido por inmersión en caliente, de alta resistencia, con alto límite de eleasticidad, y métodos para la producción de las mismas
ES2391312T3 (es) 2008-03-10 2012-11-23 Swiss Steel Ag Producto longitudinal laminado en caliente y procedimiento para su fabricación
FR2958660B1 (fr) * 2010-04-07 2013-07-19 Ascometal Sa Acier pour pieces mecaniques a hautes caracteristiques et son procede de fabrication.
EP2453026A1 (de) 2010-11-10 2012-05-16 Swiss Steel AG Warmumgeformtes Stahlprodukt 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
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

Family Cites Families (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
ATE44290T1 (de) * 1985-02-16 1989-07-15 Ovako Oy Verfahren und legierter stahl zum herstellen hochfester schmiedestuecke.
GB8603500D0 (en) * 1986-02-13 1986-03-19 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
FR2685708B1 (fr) * 1991-12-30 1994-07-22 Ascometal Sa Produit long pour la fabrication par formage a froid, notamment par frappe a froid, de produits elabores tels que des boulons et procede de fabrication d'un produit a froid.
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
FR2741632B1 (fr) * 1995-11-27 1997-12-26 Ascometal Sa Acier pour la fabrication d'une piece forgee ayant une structure bainitique et procede de fabrication d'une piece

Also Published As

Publication number Publication date
EP0845544A1 (de) 1998-06-03
ES2190514T3 (es) 2003-08-01
FR2756298B1 (fr) 1998-12-24
ATE230443T1 (de) 2003-01-15
NO975392L (no) 1998-05-27
DE69718132D1 (de) 2003-02-06
NO975392D0 (no) 1997-11-24
FR2756298A1 (fr) 1998-05-29
DE69718132T2 (de) 2003-10-09

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