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EP0779375B1 - Stahl für die Herstellung von teilbaren Maschinenteilen und Maschinenteile, hergestellt aus diesen Stahl - Google Patents

Stahl für die Herstellung von teilbaren Maschinenteilen und Maschinenteile, hergestellt aus diesen Stahl Download PDF

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Publication number
EP0779375B1
EP0779375B1 EP96402534A EP96402534A EP0779375B1 EP 0779375 B1 EP0779375 B1 EP 0779375B1 EP 96402534 A EP96402534 A EP 96402534A EP 96402534 A EP96402534 A EP 96402534A EP 0779375 B1 EP0779375 B1 EP 0779375B1
Authority
EP
European Patent Office
Prior art keywords
steel
chemical composition
mpa
steel according
less
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
EP96402534A
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English (en)
French (fr)
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EP0779375A1 (de
Inventor
Marc Robelet
Jacques Bellus
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 France Holding SAS
Original Assignee
Ascometal SA
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Filing date
Publication date
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Application filed by Ascometal SA filed Critical Ascometal SA
Publication of EP0779375A1 publication Critical patent/EP0779375A1/de
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Publication of EP0779375B1 publication Critical patent/EP0779375B1/de
Anticipated expiration legal-status Critical
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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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 present invention relates to a steel for manufacturing a part of breakable mechanics, and in particular for the manufacture of a connecting rod for internal combustion engine.
  • connection rods internal combustion engine consist of at least two elements separable assembled by fixing means such as screws.
  • These parts can be cast iron, sintered and forged metal powder, or forged steel.
  • the invention relates to parts, and in particular connecting rods, in forged steel.
  • the steel constituting the forged steel connecting rods must be forgeable, easily machinable and have mechanical characteristics allowing to ensure good service life of the connecting rods. Characteristics mechanical properties generally required are a hardness of between 210 HB and 360 HB and a breaking strength of between 650 MPa and 1200 MPa. to obtain sufficient resistance to fatigue, and an elastic limit included between 300 MPa and 800 MPa in order to avoid deformation by exceeding the elastic limit.
  • the precise choice of characteristics required for a particular connecting rod intended for a particular engine depends on the design of the rod and the nature of the engine in which it is incorporated.
  • the steel which constitutes it is chosen in function of these mechanical characteristics and the manufacturing process which includes, after forging, a controlled cooling intended to obtain a ferrito-pearlitic structure which has mechanical characteristics required and satisfactory machinability.
  • the steels used are, in general carbon steels like XC42 or low alloy steels like 45M5, 30MSV6, 38MVS5 (according to French standard).
  • the carbon content is chosen mainly according to the level of hardness required, and the elements of alloy are added either to increase the hardenability of the steel so increase the proportion of perlite, which is favorable for machinability, i.e. to harden ferrite and improve the yield strength to strength ratio rupture.
  • the separation of the different parts of the connecting rod does not can only be done by machining which requires a complex machining range and expensive.
  • Impurities taken among P, Si, Ni, V, Cu, Cr and Mo having individual contents preferably such as: Ni ⁇ 0.2%, Mo ⁇ 0.02%, Cr ⁇ 0.1%, Cu ⁇ 0.15% V ⁇ 0.035% 0.15% ⁇ If ⁇ 0.35%, and P ⁇ 0.03%.
  • this steel which is of the XC70 type (according to the French standard), has the disadvantage of having an irregular behavior during the fragile rupture operation, in particular because, it is practically impossible to control industrially the proportion of proeutectoid phase, this can vary from 0% to 15% depending on the exact chemical analysis of the steel and the means of manufacture used, which makes it difficult to use industrially, moreover, it only makes it possible to obtain the characteristics specific to the XC70 which limits its use to parts for which these characteristics are suitable.
  • the object of the present invention is to remedy these drawbacks by offering a steel which makes it possible to obtain the mechanical characteristics required for a wide range of applications, particularly in the field connecting rods, and good machinability, while allowing the operation to be carried out brittle failure under satisfactory industrial conditions.
  • the invention relates to a steel for the manufacture of a breakable mechanical part whose chemical composition comprises, by weight: 0.25% ⁇ C ⁇ 0.75%, 0.2% ⁇ If ⁇ 1.5%, 0.1% ⁇ Mn ⁇ 2%, 0% ⁇ Ni ⁇ 1%, 0% ⁇ Cr ⁇ 1%, 0% ⁇ Mo ⁇ 1%, 0% ⁇ Cu ⁇ 1%, 0% ⁇ V ⁇ 0.2%, 0.02% ⁇ S ⁇ 0.35%, 0.04% ⁇ P ⁇ 0.2%, 0% ⁇ Al ⁇ 0.005%, 0.005% ⁇ N ⁇ 0.02%, possibly at minus one element taken from lead, tellurium and selenium in contents less than 0.1%, the remainder being iron and impurities resulting from elaboration, the steel possibly being treated with calcium.
  • the chemical composition of the steel satisfies at least one of the following relationships: 0.06% ⁇ P ⁇ 0.12%, 0.8% ⁇ If ⁇ 1.2%, 0.05% ⁇ V ⁇ 0.15%.
  • the chemical composition of the steel can be such that: 0.65% ⁇ C ⁇ 0.75%, 0.25% ⁇ Mn ⁇ 1%, Ni ⁇ 0.15%, Cr ⁇ 0.15%, Mo ⁇ 0.05%, Cu ⁇ 0.35%
  • the chemical composition of the steel can also be such that: 0.25% ⁇ C ⁇ 0.5%, Ni ⁇ 0.15%, Cr ⁇ 0.15%, Mo ⁇ 0.05%, Cu ⁇ 0.35%, preferably with 0.25% ⁇ Mn ⁇ 1.3%.
  • the invention also relates to the use of a steel according to the invention for the manufacture of a mechanical part comprising at least two elements obtained by fragile rupture of a blank of said part, as well as said piece.
  • This part can be, in particular, a connecting rod for a motor internal combustion consisting for example of a steel whose hardness is between 210 HB and 360 HB, the breaking strength is between 650 MPa and 1200 MPa, with a majority of relatively large grains, of which the ASTM size index of the austenitic grains is less than 5, having, preferably, a structure comprising at least 70% perlite.
  • a steel close to the eutectoid comprising from 0.65% to 0.75% of carbon, less than 1% silicon, 0.25% to 1% manganese, less than 0.15% nickel, less than 0.15% chromium, less than 0.05% molybdenum, less than 0.35% copper and less than 0.005% aluminum.
  • This steel can be carbon steel, at which case it contains less than 0.5% manganese. But it can be also a steel weakly alloyed with manganese, silicon, or possibly with vanadium. It can then contain between 1% and 2% of manganese, and / or between 0.5% and 1.5% of silicon, and / or between 0.5% and 0.2% of vanadium.
  • the blanks were then machined and then separated in half elements by fragile rupture. This separation by fragile rupture was made without difficulty whatever the ferrite content.
  • the blanks were then machined and then separated in half elements by fragile rupture. This separation by fragile rupture was made without difficulty whatever the ferrite content.
  • the blanks were then machined and then separated in half elements by fragile rupture. This separation by fragile rupture was made without difficulty whatever the ferrite content.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Powder Metallurgy (AREA)

Claims (12)

  1. Stahl zur Herstellung eines teilbaren Maschinenteils, dadurch gekennzeichnet, dass seine chemische Zusammensetzung in Gewichtsprozenten aufweist:
    0,25 % ≤ C ≤ 0,75 %
    0,2 % ≤ Si ≤ 1,5 %
    0,1 % ≤ Mn ≤ 2 %
    0 % ≤ Ni ≤ 1 %
    0 % ≤ Cr ≤ 1 %
    0 % ≤ Mo ≤ 1 %
    0 % ≤ Cu ≤ 1 %
    0 % ≤ V ≤ 0,2 %
    0,02 % ≤ S ≤ 0,35 %
    0,04 % ≤ P ≤ 0,2 %
    0 % ≤ Al ≤ 0,005 %
    0,005 % ≤ N ≤ 0,02 %
    gegebenenfalls wenigstens ein Element, das ausgewählt ist aus Blei, Tellur und Selen mit Gehalten von weniger als 0,1 %,
    Rest Eisen und aus der Verarbeitung stammende Verunreinigungen, wobei der Stahl gegebenenfalls mit Kalzium behandelt ist.
  2. Stahl nach Anspruch 1, dadurch gekennzeichnet, dass seine chemische Zusammensetzung derart ist, dass gilt:
       0,06 % ≤ P ≤ 0,12 %.
  3. Stahl nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass seine chemische Zusammensetzung derart ist, dass gilt:
       0,8 % ≤ Si ≤ 1,2 %.
  4. Stahl nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass seine chemische Zusammensetzung derart ist, dass gilt:
       0,05 % ≤ V ≤ 0,15 %
  5. Stahl nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass seine chemische Zusammensetzung derart ist, dass gilt:
    0,65 % ≤ C ≤ 0,75 %
    0,25 % ≤ Mn ≤ 1 %
    Ni ≤ 0,15 %
    Cr ≤ 0,15 %
    Mo ≤ 0,05 %
    Cu ≤ 0,35 %
    Al ≤ 0,005 %
  6. Stahl nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass seine chemische Zusammensetzung derart ist, dass gilt:
    0,25 % ≤ C ≤ 0,5 %
    Ni ≤ 0,15 %
    Cr ≤ 0,15 %
    Mo ≤ 0,05 %
    Cu ≤ 0,35 %
  7. Stahl nach Anspruch 6, dadurch gekennzeichnet, dass seine chemische Zusammensetzung derart ist, dass gilt:
       0,25 % ≤ Mn ≤ 1,3 %.
  8. Verwendung eines Stahls nach einem der Ansprüche 1 bis 7 zur Herstellung eines Maschinenteils, das wenigstens zwei Bauteile enthält, die durch einen Trennbruch eines Rohlings erhalten worden sind.
  9. Verwendung eines Stahls nach Anspruch 8, dadurch gekennzeichnet, dass das Teil eine ferrito-perlitische Struktur aufweist.
  10. Maschinenteil, das wenigstens zwei Bauteile enthält, die durch einen Trennbruch eines Rohlings erhalten worden sind, insbesondere Pleuelstange, beispielsweise für einen Verbrennungsmotor, dadurch gekennzeichnet, dass es aus einem Stahl gemäß einem der Ansprüche 1 bis 7 besteht.
  11. Teil nach Anspruch 10, dadurch gekennzeichnet, dass der Stahl, aus dem es besteht, eine Härte aufweist, die zwischen 210 HB und 360 HB liegt, eine Bruchfestigkeit aufweist, die zwischen 650 MPa und 1200 MPa liegt und eine Mehrheit an Körnern aufweist, deren Größenindex ASTM für das austenitische Korn kleiner als 5 ist.
  12. Teil nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass der es bildende Stahl eine Struktur aufweist, die wenigstens 70 % Perlit enthält.
EP96402534A 1995-12-14 1996-11-26 Stahl für die Herstellung von teilbaren Maschinenteilen und Maschinenteile, hergestellt aus diesen Stahl Expired - Lifetime EP0779375B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9514833A FR2742448B1 (fr) 1995-12-14 1995-12-14 Acier pour la fabrication de pieces de mecanique secables et piece obtenue
FR9514833 1995-12-14

Publications (2)

Publication Number Publication Date
EP0779375A1 EP0779375A1 (de) 1997-06-18
EP0779375B1 true EP0779375B1 (de) 2000-06-07

Family

ID=9485504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96402534A Expired - Lifetime EP0779375B1 (de) 1995-12-14 1996-11-26 Stahl für die Herstellung von teilbaren Maschinenteilen und Maschinenteile, hergestellt aus diesen Stahl

Country Status (17)

Country Link
US (1) US5769970A (de)
EP (1) EP0779375B1 (de)
JP (1) JPH09176796A (de)
KR (1) KR970043238A (de)
CN (1) CN1158908A (de)
AR (1) AR004375A1 (de)
AT (1) ATE193733T1 (de)
BR (1) BR9606002A (de)
CA (1) CA2192509A1 (de)
DE (1) DE69608773T2 (de)
DK (1) DK0779375T3 (de)
ES (1) ES2148705T3 (de)
FR (1) FR2742448B1 (de)
GR (1) GR3034003T3 (de)
NO (1) NO965318L (de)
PL (1) PL192823B1 (de)
PT (1) PT779375E (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008028447A1 (de) 2006-09-01 2008-03-13 Georgsmarienhütte Gmbh Stahl und verarbeitungsverfahren für die herstellung von höherfesten bruchtrennbaren maschinenbauteilen

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EP0856590B2 (de) * 1997-02-04 2005-12-28 Daido Tokushuko Kabushiki Kaisha Hochfester nicht-thermischer Frischstahl für Warmschmieden
JP3445478B2 (ja) * 1997-11-18 2003-09-08 いすゞ自動車株式会社 機械構造用鋼及びそれを用いた破断分割機械部品
FR2774098B1 (fr) * 1998-01-28 2001-08-03 Ascometal Sa Acier et procede pour la fabrication de pieces de mecanique secables
GB2335200A (en) * 1998-03-10 1999-09-15 British Steel Plc Steel composition
JP3671688B2 (ja) * 1998-08-28 2005-07-13 株式会社神戸製鋼所 破断分断性に優れた破断分割型コンロッド用熱間鍛造用非調質鋼
FR2800670B1 (fr) * 1999-11-05 2003-04-18 Fag Oem & Handel Ag Bandage de roues ou roue monobloc pour des jeux de roues de vehicules ferroviaires
US6395109B1 (en) * 2000-02-15 2002-05-28 Cargill, Incorporated Bar product, cylinder rods, hydraulic cylinders, and method for manufacturing
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
US7819794B2 (en) * 2002-10-21 2010-10-26 Becker Paul F Method and apparatus for the treatment of physical and mental disorders with low frequency, low flux density magnetic fields
US6899667B2 (en) * 2002-10-21 2005-05-31 Paul F. Becker Method and apparatus for the treatment of physical and mental disorders with low frequency, low flux density magnetic fields
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
JP2005308189A (ja) * 2004-04-26 2005-11-04 Honda Motor Co Ltd コネクティングロッド及びその製造方法
JP4763551B2 (ja) * 2006-08-24 2011-08-31 住友金属工業株式会社 破断分離性と加工性に優れた機械構造用鋼およびその製造方法
EP2236594B1 (de) * 2007-11-28 2013-10-16 Kao Corporation Verfahren zur ablösung von biofilmem
JP4264460B1 (ja) * 2007-12-03 2009-05-20 株式会社神戸製鋼所 破断分割性および被削性に優れた破断分割型コネクティングロッド用鋼
RU2433200C2 (ru) * 2008-12-05 2011-11-10 Федеральное Государственное Унитарное Предприятие "Научно-исследовательский и экспериментальный институт автомобильной электроники и электрооборудования" (ФГУП НИИАЭ) Автоматная сталь и изделие, выполненное из нее
CN102061995A (zh) * 2010-11-26 2011-05-18 杭州汽轮铸锻有限公司 一种燃气轮机进气缸及制作工艺
FR3064282B1 (fr) * 2017-03-23 2021-12-31 Asco Ind Acier, procede pour la fabrication de pieces mecaniques en cet acier, et pieces ainsi fabriquees
CN109234626B (zh) * 2018-07-18 2020-11-24 石家庄钢铁有限责任公司 一种易切削重载汽车轮毂轴承用钢及制造方法
CN114645208B (zh) * 2022-03-23 2023-04-25 青海西钢特殊钢科技开发有限公司 一种采用碲处理的非调质胀断连杆用钢及其生产方法
CN115029640B (zh) * 2022-06-29 2023-04-07 马鞍山钢铁股份有限公司 一种Te微合金化中碳胀断连杆用钢及制造方法和应用
CN114959501B (zh) * 2022-06-29 2023-04-07 马鞍山钢铁股份有限公司 一种Te微合金化高碳胀断连杆用钢及制造方法和应用

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008028447A1 (de) 2006-09-01 2008-03-13 Georgsmarienhütte Gmbh Stahl und verarbeitungsverfahren für die herstellung von höherfesten bruchtrennbaren maschinenbauteilen
EP2057298A1 (de) 2006-09-01 2009-05-13 Georgsmarienhütte GmbH Stahl und verarbeitungsverfahren für die herstellung von höherfesten bruchtrennbaren maschinenbauteilen

Also Published As

Publication number Publication date
DK0779375T3 (da) 2000-10-16
DE69608773T2 (de) 2001-02-01
US5769970A (en) 1998-06-23
NO965318L (no) 1997-06-16
FR2742448B1 (fr) 1998-01-16
DE69608773D1 (de) 2000-07-13
JPH09176796A (ja) 1997-07-08
AR004375A1 (es) 1998-11-04
KR970043238A (ko) 1997-07-26
PL317455A1 (en) 1997-06-23
MX9606392A (es) 1997-10-31
NO965318D0 (no) 1996-12-12
CA2192509A1 (fr) 1997-06-15
CN1158908A (zh) 1997-09-10
ES2148705T3 (es) 2000-10-16
PL192823B1 (pl) 2006-12-29
EP0779375A1 (de) 1997-06-18
PT779375E (pt) 2000-10-31
FR2742448A1 (fr) 1997-06-20
ATE193733T1 (de) 2000-06-15
BR9606002A (pt) 1998-09-01
GR3034003T3 (en) 2000-11-30

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