EP2057298B1 - Acier et procédé de transformation pour produire des pièces mécaniques pouvant être séparées par rupture présentant une résistance accrue - Google Patents

Acier et procédé de transformation pour produire des pièces mécaniques pouvant être séparées par rupture présentant une résistance accrue Download PDF

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Publication number
EP2057298B1
EP2057298B1 EP07801178A EP07801178A EP2057298B1 EP 2057298 B1 EP2057298 B1 EP 2057298B1 EP 07801178 A EP07801178 A EP 07801178A EP 07801178 A EP07801178 A EP 07801178A EP 2057298 B1 EP2057298 B1 EP 2057298B1
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EP
European Patent Office
Prior art keywords
steel
following
cooling down
component according
controlled cooling
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.)
Active
Application number
EP07801178A
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German (de)
English (en)
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EP2057298A1 (fr
Inventor
Roman Diederichs
Axel Stüber Dr.
Robert Lange
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.)
Georgsmarienhuette GmbH
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Georgsmarienhuette GmbH
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Publication of EP2057298A1 publication Critical patent/EP2057298A1/fr
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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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

Definitions

  • the present invention relates to a steel and the processing method for the manufacture of higher-strength machine components, which consist of at least two fracture-separated parts. This material was developed, for example, for the production of cracking pipes.
  • the steel must be suitable for forging or other hot forming.
  • Forged heat with controlled cooling requires the setting of a largely pearlitic structure with a yield strength of more than 750 N / mm 2 , a tensile strength of 1000 to 1200 N / mm 2 , an elongation at break of more than 10% and a fracture rate of more than 25% , Particularly important is the suitability for fracture separation.
  • the desired properties can be achieved by the targeted adjustment of a pearlitic structure with precipitates of special carbides (niobium and vanadium carbides) and of manganese sulfides by a correspondingly adjusted chemical composition, a targeted temperature control during hot forming during the production of the starting material and in the final forging of the components (thermomechanical treatment) and a matched heat treatment after forging or hot forging.
  • steels of almost eutectoid composition having about 0.7% C, 0.5 to 0.9% Mn, 0.06 to 0.07% S and optionally 0.1 to 0.2 are used % V (C70S6, 70MnVS4) or with average carbon content of about 0.4% C, about 1% Mn, 0.06 to 0.07% S and about 0.3% V (36MnVS4) according to technical customer specifications.
  • the object of the present invention is to avoid the mentioned disadvantages by proposing a new steel which has the required mechanical properties in terms of strength (and fatigue strength) and in addition combines good toughness properties in the tensile test with simultaneously good crackability.
  • the steel should be readily pourable and forgeable.
  • the new steel should be able to be produced in a way that saves resources compared to the known steels by a partial substitution of the vanadium content by niobium with a correspondingly adapted forming and cooling strategy.
  • a crackable steel is also from the EP 0779 375 B1 known. However, the addition of niobium is not provided here.
  • the high value for the yield strength is achieved in accordance with the invention in addition to the basic chemical composition by precipitation of carbides of the carbide blanks, niobium and vanadium, which are dispersed as finely as possible.
  • a resolution of the existing carbides before the last hot forming step is required as well as a controlled temperature control during hot forming and the subsequent cooling.
  • Finely divided precipitates can be achieved in particular with a low final forming temperature followed by slightly accelerated cooling. As a result, in particular the yield strength is increased and thus the yield ratio significantly improved.
  • the tensile strength can be improved from the base value given by the base composition with 0.5% C, 0.6% Si, 1.0% Mn, 0.23% Cr, 0.2% Ni and 0.14% V by a slightly accelerated Cooling after hot forming can also be set in the desired range.
  • the toughness characteristics are limited in particular by the targeted addition of 0.06 to 0.07% sulfur. Also positive in this sense are the carbon content and the relatively high nitrogen content.
  • the invention relates to a steel for producing fracture-separable components for the vehicle industry according to claim 1.

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)
  • Heat Treatment Of Articles (AREA)
  • Forging (AREA)
  • Processing Of Solid Wastes (AREA)

Claims (11)

  1. Acier pour composants mécaniques à résistance accrue, qui sont constitués d'au moins deux pièces séparées par cassure, caractérisé en ce que sa composition chimique comprend les teneurs suivantes, en pourcents en poids : 0,45 % ≤ C ≤ 0,55 % 0,50 % ≤ Si ≤ 0,70 % 0,90 % ≤ Mn ≤ 1,10 % 0,10 % ≤ Cr ≤ 0,40 % 0,10 % ≤ Ni ≤ 0,30 % 0 % ≤ Mo ≤ 0,20 % 0,10 % ≤ V ≤ 0,20 % 0,010 % ≤ Al ≤ 0,020 % 0,020 % ≤ Nb ≤ 0,030 % 0,010 % ≤ N ≤ 0,020 % en option 0,02 % ≤ Ti ≤ 0,030 %
    le reste étant constitué de fer et des impuretés dues à l'élaboration.
  2. Acier selon la revendication 1, caractérisé en ce que sa composition chimique est telle que : 0,45 % ≤ C ≤ 0,55 % 0,50 % ≤ Si ≤ 0,70 % 0,90 % ≤ Mn ≤ 1,10 % 0,10 % ≤ Cr ≤ 0,40 % 0,10 % ≤ Ni ≤ 0,30 % 0,10 % ≤ V ≤ 0,20 % 0,010 % ≤ Al ≤ 0,020 % 0,020 % ≤ Nb ≤ 0,030 % 0,010 % ≤ N ≤ 0,020 % 0,020 % ≤ Ti ≤ 0,030 %
  3. Acier selon la revendication 1 ou 2, caractérisé en ce que sa composition chimique est telle que : 0,45 % ≤ C ≤ 0,55 % 0,50 % ≤ Si ≤ 0,70 % 0,90% ≤ Mn ≤ 1,10 % 0, 30 % ≤ Cr ≤ 0,40 % 0,10 % ≤ Ni ≤ 0,20 % 0,10 % ≤ V ≤ 0,20 % 0,010 % ≤ Al ≤ 0,020 % 0,020 % ≤ Nb ≤ 0,030 % 0,015 % ≤ N ≤ 0,020 %
  4. Utilisation d'un acier selon l'une des revendications 1 à 3 pour la fabrication de composants, pouvant être séparés par cassure, pour la construction automobile, qui présente, après le forgeage et un refroidissement contrôlé, une structure essentiellement perlitique, avec des précipitations de carbures spéciaux.
  5. Composant fabriqué selon la revendication 4, caractérisé en ce que la limite apparente d'élasticité, après un refroidissement contrôlé à partir de la chaleur de déformation, est supérieure à 750 N/mm2.
  6. Composant selon la revendication 5, caractérisé en ce que la résistance à la traction, après un refroidissement contrôlé à partir de la chaleur de déformation, est supérieure à 950 N/mm2 et inférieure à 1200 N/mm2.
  7. Composant selon la revendication 6, caractérisé en ce que l'allongement à la rupture, après un refroidissement contrôlé à partir de la chaleur de déformation, est supérieur à 10 %.
  8. Composant selon la revendication 7, caractérisé en ce que le coefficient de striction, après un refroidissement contrôlé à partir de la chaleur de déformation, est supérieure à 25 %.
  9. Composant selon la revendication 8, caractérisé en ce qu'il est séparable par cassure.
  10. Composant selon la revendication 9, caractérisé en ce qu'il convient à une trempe inductive.
  11. Composant selon la revendication 10, caractérisé en ce que les propriétés mécaniques peuvent être ajustées par un traitement thermomécanique tant dans le matériau primaire de forgeage que dans le composant.
EP07801178A 2006-09-01 2007-07-27 Acier et procédé de transformation pour produire des pièces mécaniques pouvant être séparées par rupture présentant une résistance accrue Active EP2057298B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006041146A DE102006041146A1 (de) 2006-09-01 2006-09-01 Stahl und Verarbeitungsverfahren für die Herstellung von höherfesten bruchtrennbaren Maschinenbauteilen
PCT/DE2007/001337 WO2008028447A1 (fr) 2006-09-01 2007-07-27 Acier et procédé de transformation pour produire des pièces mécaniques pouvant être séparées par rupture présentant une résistance accrue

Publications (2)

Publication Number Publication Date
EP2057298A1 EP2057298A1 (fr) 2009-05-13
EP2057298B1 true EP2057298B1 (fr) 2012-11-14

Family

ID=38989625

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Application Number Title Priority Date Filing Date
EP07801178A Active EP2057298B1 (fr) 2006-09-01 2007-07-27 Acier et procédé de transformation pour produire des pièces mécaniques pouvant être séparées par rupture présentant une résistance accrue

Country Status (15)

Country Link
US (1) US20100186855A1 (fr)
EP (1) EP2057298B1 (fr)
JP (1) JP2010501733A (fr)
KR (1) KR20090049591A (fr)
CN (1) CN101542007A (fr)
AR (1) AR062184A1 (fr)
AU (1) AU2007294317B2 (fr)
BR (1) BRPI0716206A2 (fr)
CA (1) CA2666677A1 (fr)
DE (1) DE102006041146A1 (fr)
MX (1) MX2009001971A (fr)
RU (1) RU2441093C2 (fr)
TW (1) TW200825188A (fr)
WO (1) WO2008028447A1 (fr)
ZA (1) ZA200900848B (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3168319B1 (fr) * 2014-07-08 2020-12-16 Sidenor Investigación y Desarrollo, S.A. Acier haute résistance faiblement allié pour formage à chaud de pièces de haute résistance et de limite élastique élevée
CN105543651B (zh) * 2015-12-21 2017-11-17 武钢集团昆明钢铁股份有限公司 一种用于制造水电站发电机转轴、铰轴的锻件钢钢水及其冶炼方法
CN107619995A (zh) * 2017-08-11 2018-01-23 江阴兴澄特种钢铁有限公司 一种大直径工程机械液压油缸活塞杆用圆钢及其制造方法
EP3453777A1 (fr) 2017-09-08 2019-03-13 Cemtas Celk Makina Sanayi Ve Ticaret Anonim Sirketi Acier micro allié fractionnable et à résistance élevée
CN108546879A (zh) * 2018-05-11 2018-09-18 攀钢集团攀枝花钢铁研究院有限公司 含V、Nb非调质预硬型塑料模具钢及其制备方法
CN108486472A (zh) * 2018-05-11 2018-09-04 攀钢集团攀枝花钢铁研究院有限公司 含V、Ti、N非调质预硬型塑料模具钢及其制备方法
CN108624815A (zh) * 2018-05-11 2018-10-09 攀钢集团攀枝花钢铁研究院有限公司 含V、Nb、Ti非调质预硬型塑料模具钢及其制备方法
CN108504934A (zh) * 2018-05-11 2018-09-07 攀钢集团攀枝花钢铁研究院有限公司 含V、Nb、N非调质预硬型塑料模具钢及其制备方法
CN108504935A (zh) * 2018-05-11 2018-09-07 攀钢集团攀枝花钢铁研究院有限公司 含v、n非调质预硬型塑料模具钢及其制备方法
CN110284055A (zh) * 2019-06-17 2019-09-27 威海津恒科技有限公司 一种耐磨汽车冲压件模具及其制备方法
BR112022006127A2 (pt) 2019-11-18 2022-06-21 Arcelormittal Aço para forjamento de peça mecânica, método de produção de peça mecânica de aço forjada, uso de um aço e veículo
TR201921217A2 (tr) 2019-12-24 2021-07-26 Tirsan Kardan Sanayi Ve Ticaret Anonim Sirketi Yüksek mukavemetli, düşük alaşımlı çelik kompozisyonu
CN111235487B (zh) * 2020-03-23 2021-08-31 马鞍山钢铁股份有限公司 一种长寿命钎杆用钢及其生产方法
CN114058943A (zh) * 2021-09-14 2022-02-18 武汉钢铁有限公司 一种微合金钢及其制作方法

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JPH01176055A (ja) * 1987-12-28 1989-07-12 Kawasaki Steel Corp 被削性に優れた熱間鍛造用非調質鋼
JPH04191348A (ja) * 1990-11-24 1992-07-09 Daido Steel Co Ltd 高靭性非調質鋼
FR2742448B1 (fr) 1995-12-14 1998-01-16 Ascometal Sa Acier pour la fabrication de pieces de mecanique secables et piece obtenue
DE69813920T3 (de) * 1997-02-04 2006-08-03 Daido Tokushuko K.K., Nagoya Hochfester nicht-thermischer Frischstahl für Warmschmieden
FR2774098B1 (fr) 1998-01-28 2001-08-03 Ascometal Sa Acier et procede pour la fabrication de pieces de mecanique secables
JP5023410B2 (ja) * 2001-03-02 2012-09-12 大同特殊鋼株式会社 破断分離が容易な熱間鍛造用非調質鋼
JP3893889B2 (ja) * 2001-03-21 2007-03-14 大同特殊鋼株式会社 破断による分離が容易な熱間鍛造用非調質鋼
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JP4346404B2 (ja) * 2002-11-20 2009-10-21 本田技研工業株式会社 低温での破断分離用非調質鋼及びこの非調質鋼からなる勘合部材

Also Published As

Publication number Publication date
KR20090049591A (ko) 2009-05-18
WO2008028447A1 (fr) 2008-03-13
AR062184A1 (es) 2008-10-22
MX2009001971A (es) 2009-03-09
DE102006041146A1 (de) 2008-03-06
ZA200900848B (en) 2009-12-30
EP2057298A1 (fr) 2009-05-13
RU2009111860A (ru) 2010-10-10
JP2010501733A (ja) 2010-01-21
CN101542007A (zh) 2009-09-23
CA2666677A1 (fr) 2008-03-13
AU2007294317A1 (en) 2008-03-13
TW200825188A (en) 2008-06-16
RU2441093C2 (ru) 2012-01-27
US20100186855A1 (en) 2010-07-29
AU2007294317B2 (en) 2011-10-13
BRPI0716206A2 (pt) 2013-11-12

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