EP1884573A1 - Steel manufacturing process and steel obtained using this process - Google Patents

Steel manufacturing process and steel obtained using this process Download PDF

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Publication number
EP1884573A1
EP1884573A1 EP07380044A EP07380044A EP1884573A1 EP 1884573 A1 EP1884573 A1 EP 1884573A1 EP 07380044 A EP07380044 A EP 07380044A EP 07380044 A EP07380044 A EP 07380044A EP 1884573 A1 EP1884573 A1 EP 1884573A1
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EP
European Patent Office
Prior art keywords
steel
weight
manufacturing process
mechanical characteristics
toughness
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.)
Withdrawn
Application number
EP07380044A
Other languages
German (de)
French (fr)
Inventor
Kristina Urkola Etxetxipia
Beatriz Lopez Soria
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.)
Sidenor Industrial SL
Original Assignee
Gsb Acero S A
GSB Acero SA
Sidenor Industrial SL
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 Gsb Acero S A, GSB Acero SA, Sidenor Industrial SL filed Critical Gsb Acero S A
Publication of EP1884573A1 publication Critical patent/EP1884573A1/en
Withdrawn legal-status Critical Current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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
    • 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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length

Definitions

  • the object of the invention is a process for manufacturing a steel and the steel obtained during this process.
  • the present invention is related to the novel steel compositions having average carbon and low alloy contents, for applications in which high strength and very good toughness at low temperatures are required at the same time.
  • the essential object of the present invention is to achieve high strength and improved toughness in an economical manner.
  • the advantages of the object of this invention reside in obtaining a steel having mechanical characteristics which were previously obtained with more alloy steels, by means of a concrete manufacturing process, which is also the subject of the invention and with small additions of Cr, Ni, Mo and B.
  • the steel obtained according to this invention succeeds in preserving the mechanical characteristics and improves the toughness between 20-40%, throughout the curve, of the ambient temperature at -100 ° C.
  • the steel obtained according to this invention has an average C content (0.25% -0.35% by weight), with small amounts of Cr (0.30% -0.70% by weight), Ni (0.30% -1% by weight) , and B (0'0010% -0'0050% by weight).
  • the rolling is carried out hot, between 1000 ° C and 1100 ° C and the cooling is, as usual, air.
  • the quenching (850 ° C.-900 ° C.) and the quenching (440 ° C.-500 ° C.) are then carried out in order to obtain the desired mechanical characteristics.
  • a casting having the following composition was made in% by weight: C: 0.31 If: 0.24 Mn: 1.46 Cr: 0.44 Ni: 0.44 Mo: 0.05 Ti: 0.040 B: 0.030 P: 0.008 S: 0.008

Abstract

Steel with high-strength and good tenacity, comprises (wt.%) carbon (0.25-0.35), chromium (0.3-0.7), nickel (0.3-1), boron (0.001-0.005) and titanium (0.02-0.05). An independent claim is included for preparation of the steel comprising hot roll at 1000-1100[deg] C, cooling with air, hardening at 850-900[deg] C, retempering at 440-500[deg] C.

Description

L'objet de l'invention est un processus de fabrication d'un acier et l'acier obtenu lors de ce processus.The object of the invention is a process for manufacturing a steel and the steel obtained during this process.

La présente invention est en rapport avec les nouvelles compositions d'aciers ayant des teneurs moyennes en carbone et faible alliage, pour des applications dans lesquelles sont exigées, en même temps, une résistance élevée et une très bonne ténacité à basses températures.The present invention is related to the novel steel compositions having average carbon and low alloy contents, for applications in which high strength and very good toughness at low temperatures are required at the same time.

Il existe de plus en plus d'applications de l'acier dans lesquelles il est demandé, en même temps, une résistance élevée et une très bonne ténacité à basses températures et dans de plus grandes sections.There are more and more steel applications in which, at the same time, high strength and toughness are required at low temperatures and in larger sections.

L'objectif essentiel de la présente invention est d'arriver à une résistance élevée et à une amélioration de cette ténacité d'une façon économique.The essential object of the present invention is to achieve high strength and improved toughness in an economical manner.

Dans l'état actuel de la technique, la combinaison d'une résistance élevée avec une bonne ténacité à basses températures est obtenue avec des aciers alliés au Cr, Ni, Mo (aciers F1252, F1272). Plus la section sera grande, plus l'alliage demandé sera grand. Les fourchettes des aciers F1252 et F1272 en % de poids sont les suivantes : F1252 F1272 C: 0.37-0.43 0.37-0.43 Si: 0.15-0.40 0.15-0.40 Mn: 0.60-0.90 0.55-0.85 Cr: 0.85-1.15 0.65-0.95 Ni: - 1.60-2.00 Mo: 0.15-0.25 0.15-0.30 P: <0.035 <0.035 S: <0.035 <0.035 In the current state of the art, the combination of high strength with good toughness at low temperatures is achieved with Cr, Ni, Mo alloy steels (F1252, F1272 steels). The larger the section, the larger the alloy required. The ranges of F1252 and F1272 steels in% by weight are as follows: F1252 F1272 VS: 0.37-0.43 0.37-0.43 Yes: 0.15-0.40 0.15-0.40 mn: 0.60-0.90 0.55-0.85 Cr: 0.85-1.15 0.65-0.95 Or: - 1.60-2.00 MB: 0.15-0.25 0.15-0.30 P: <0.035 <0.035 S: <0.035 <0.035

Avec l'acier F1252, on arrive à obtenir certaines caractéristiques mécaniques, à partir desquelles il faut passer à l'acier F1272, qui, compte tenu des niveaux de Ni employés, est un acier très cher.With F1252 steel, certain mechanical characteristics are achieved, from which it is necessary to switch to steel F1272, which, considering the levels of Ni employed, is a very expensive steel.

Les avantages que représente l'objet de cette invention résident dans l'obtention d'un acier ayant des caractéristiques mécaniques qui étaient obtenues auparavant avec des aciers plus alliés, au moyen d'un processus de fabrication concret, qui fait également l'objet de l'invention et avec de petites additions de Cr, Ni, Mo et B.The advantages of the object of this invention reside in obtaining a steel having mechanical characteristics which were previously obtained with more alloy steels, by means of a concrete manufacturing process, which is also the subject of the invention and with small additions of Cr, Ni, Mo and B.

L'acier obtenu conformément à cette invention, en ce qui concerne l'acier F1252, réussit à conserver les caractéristiques mécaniques et améliore la tenacité entre 20-40%, sur toute la courbe, de la température ambiante à -100°C.The steel obtained according to this invention, with respect to F1252 steel, succeeds in preserving the mechanical characteristics and improves the toughness between 20-40%, throughout the curve, of the ambient temperature at -100 ° C.

L'acier obtenu conformément à cette invention présente une teneur moyenne en C (0.25%-0.35% en poids), avec de petites quantités de Cr (0.30%-0.70% en poids), Ni (0.30%-1% en poids), et B (0'0010%-0'0050% en poids).The steel obtained according to this invention has an average C content (0.25% -0.35% by weight), with small amounts of Cr (0.30% -0.70% by weight), Ni (0.30% -1% by weight) , and B (0'0010% -0'0050% by weight).

En l'employant, on obtient une amélioration importante de la ténacité (entre 20-40% en ce qui concerne l'acier 1252) et une bonne trempabilité, ce qui suppose l'obtention des caractéristiques mécaniques requises, même dans le cas de sections importantes.By using it, we obtain a significant improvement in toughness (between 20-40% with regard to 1252 steel) and good quenchability, which implies obtaining the required mechanical characteristics, even in the case of sections important.

On part d'un acier ayant la composition chimique suivante, en % de poids :

  • de 0'25% à 0'35% de C
  • de 0'30% à 0'70% de Cr
  • de 0'30% à 1% de Ni
  • de 0'0010% à 0'0050% de B
  • de 0'020% à 0'050% de Ti
auquel on ajoute également :
  • de 0'15% à 0'40% de Si
  • de 1'30% à 1'65% de Mn
  • jusqu'à 0'25% de Mo
  • moins de 0'035% de P
  • moins de 0'035% de S
Starting from a steel having the following chemical composition, in% by weight:
  • from 0'25% to 0'35% of C
  • from 0'30% to 0'70% of Cr
  • from 0'30% to 1% of Ni
  • from 0'0010% to 0'0050% of B
  • from 0'020% to 0'050% of Ti
to which we also add:
  • from 0'15% to 0'40% of Si
  • from 1'30% to 1'65% of Mn
  • up to 0'25% of MB
  • less than 0'035% of P
  • less than 0'035% of S

Le laminage s'effectue à chaud, entre 1000° C et 1100° C et le refroidissement se fait, comme d'habitude, à l'air. On fait ensuite la trempe (850° C -900° C) et la retrempe (440° C-500° C), afin d'obtenir les caractéristiques mécaniques voulues.The rolling is carried out hot, between 1000 ° C and 1100 ° C and the cooling is, as usual, air. The quenching (850 ° C.-900 ° C.) and the quenching (440 ° C.-500 ° C.) are then carried out in order to obtain the desired mechanical characteristics.

EXEMPLE DE RÉALISATION PRATIQUEEXAMPLE OF PRACTICAL REALIZATION

On a fabriqué une coulée ayant la composition suivante, en % de poids : C:0.31 Si: 0.24 Mn: 1.46 Cr: 0.44 Ni: 0.44 Mo: 0.05 Ti: 0.040 B: 0.030 P: 0.008 S: 0.008 A casting having the following composition was made in% by weight: C: 0.31 If: 0.24 Mn: 1.46 Cr: 0.44 Ni: 0.44 Mo: 0.05 Ti: 0.040 B: 0.030 P: 0.008 S: 0.008

Avec cette coulée, on a laminé des lots en ronds de 37-43-49 mm. de diamètre et, après la trempe et la retrempe, on a obtenu pour la barre, des caractéristiques mécaniques de 10.9 (norme EN20898 / ISO898) et des résiliences KCV à -40° C de 27J minimum.With this casting, round batches of 37-43-49 mm were rolled. in diameter and, after quenching and tempering, mechanical characteristics of 10.9 (EN20898 / ISO898 standard) and KCV resilience at -40 ° C of 27J minimum were obtained for the bar.

Application : Sur des vis forgées et après trempe et retrempe, ces caractéristiques ont été obtenues jusqu'à une métrique de 48.Application: On forged and tempered and tempered screws, these characteristics were obtained up to a metric of 48.

Claims (3)

Acier à haute résistance et à bonne ténacité, se caractérisant par le fait qu'il possède, au moins, la composition chimique suivante dans les pourcentages (% en poids) indiqués : - de 0'25% à 0'35% de C - de 0'30% à 0'70% de Cr - de 0'30% à 1 % de Ni - de 0'0010% à 0'0050% de B - de 0'020% à 0'050% de Ti High-strength, high-tenacity steel, characterized by having at least the following chemical composition in the percentages (% by weight) indicated: from 0'25% to 0'35% of C from 0'30% to 0'70% of Cr from 0'30% to 1% of Ni - from 0'0010% to 0'0050% of B from 0'020% to 0'050% of Ti Acier, selon la revendication antérieure, se caractérisant par le fait qu'en outre, il a, au moins, la composition chimique suivante dans les pourcentages (% en poids) indiqués : - de 0'15 % à 0'40% de Si - de 1'30% à 1'65% de Mn - jusqu'à 0'25% de Mo - moins de 0'035% de P - moins de 0'035% de S Steel, according to the preceding claim, characterized in that in addition, it has, at least, the following chemical composition in the percentages (% by weight) indicated: from 0'15% to 0'40% of Si from 1'30% to 1'65% of Mn - up to 0'25% of MB - less than 0'035% of P - less than 0'035% of S Processus de fabrication de l'acier des revendications 1 et 2, se caractérisant par le fait que, selon celui-ci : a) il est laminé à chaud, entre 1000° C et 1100° C, b) le refroidissement se fait à l'air. c) la trempe se fait entre 850° C y 900° C d) la retrempe se fait entre 440° C et 500° C. The steel manufacturing process of claims 1 and 2 characterized by the fact that according to this: a) it is hot rolled, between 1000 ° C and 1100 ° C, b) cooling is done in the air. c) the quenching is between 850 ° C and 900 ° C d) the tempering is between 440 ° C and 500 ° C.
EP07380044A 2006-07-31 2007-02-20 Steel manufacturing process and steel obtained using this process Withdrawn EP1884573A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES200602069A ES2293837B1 (en) 2006-07-31 2006-07-31 MANUFACTURING PROCESS OF A STEEL, AND STEEL OBTAINED IN THIS PROCESS.

Publications (1)

Publication Number Publication Date
EP1884573A1 true EP1884573A1 (en) 2008-02-06

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Family Applications (1)

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EP07380044A Withdrawn EP1884573A1 (en) 2006-07-31 2007-02-20 Steel manufacturing process and steel obtained using this process

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ES (1) ES2293837B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105177427A (en) * 2015-10-21 2015-12-23 攀钢集团西昌钢钒有限公司 Steel for 30CrMo gas cylinders and production method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2625227A1 (en) * 1987-12-23 1989-06-30 Intraviss Sn Alloy steel for nuts and bolts with checking of tightening using ultrasound
JPH0570890A (en) * 1991-09-11 1993-03-23 Nippon Steel Corp Steel for high strength bolt excellent in delayed fracture resistance
EP0550294A1 (en) * 1991-12-30 1993-07-07 Ascometal Elongated product for cold forming manufacturing process, more particularly for cold coining of shaped products such as bolts, and process for manufacturing this cold formed product
JPH05255811A (en) * 1992-03-09 1993-10-05 Sumitomo Metal Ind Ltd Steel for bolt and nut excellent in fire resistance
JPH08302445A (en) * 1995-05-02 1996-11-19 Kobe Steel Ltd Boron-containing steel excellent in workability and strength, and production of forged parts made of the same
JPH09111399A (en) * 1995-10-17 1997-04-28 Kawasaki Steel Corp Steel for high strength bolt

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940002139B1 (en) * 1991-11-30 1994-03-18 삼성중공업 주식회사 Carburized boron steels for gears
FR2838137A1 (en) * 2002-04-03 2003-10-10 Usinor STEEL FOR THE MANUFACTURE OF MOLDS FOR INJECTION MOLDING OF PLASTIC MATERIALS OR FOR THE MANUFACTURE OF TOOLS FOR THE WORKING OF METALS
JP4812220B2 (en) * 2002-05-10 2011-11-09 株式会社小松製作所 High hardness and toughness steel
AT8065U1 (en) * 2005-01-14 2006-01-15 Magna Drivetrain Ag & Co Kg STEEL FOR HARDWARE-WORKABLE MACHINE PARTS

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2625227A1 (en) * 1987-12-23 1989-06-30 Intraviss Sn Alloy steel for nuts and bolts with checking of tightening using ultrasound
JPH0570890A (en) * 1991-09-11 1993-03-23 Nippon Steel Corp Steel for high strength bolt excellent in delayed fracture resistance
EP0550294A1 (en) * 1991-12-30 1993-07-07 Ascometal Elongated product for cold forming manufacturing process, more particularly for cold coining of shaped products such as bolts, and process for manufacturing this cold formed product
JPH05255811A (en) * 1992-03-09 1993-10-05 Sumitomo Metal Ind Ltd Steel for bolt and nut excellent in fire resistance
JPH08302445A (en) * 1995-05-02 1996-11-19 Kobe Steel Ltd Boron-containing steel excellent in workability and strength, and production of forged parts made of the same
JPH09111399A (en) * 1995-10-17 1997-04-28 Kawasaki Steel Corp Steel for high strength bolt

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105177427A (en) * 2015-10-21 2015-12-23 攀钢集团西昌钢钒有限公司 Steel for 30CrMo gas cylinders and production method thereof

Also Published As

Publication number Publication date
ES2293837B1 (en) 2009-04-01
ES2293837A1 (en) 2008-03-16

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