EP0779375A1 - Stahl für die Herstellung von teilbare Maschinenteile und Maschinenteile, hergestellt aus diesen Stahl - Google Patents

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

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Publication number
EP0779375A1
EP0779375A1 EP96402534A EP96402534A EP0779375A1 EP 0779375 A1 EP0779375 A1 EP 0779375A1 EP 96402534 A EP96402534 A EP 96402534A EP 96402534 A EP96402534 A EP 96402534A EP 0779375 A1 EP0779375 A1 EP 0779375A1
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.)
Granted
Application number
EP96402534A
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English (en)
French (fr)
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EP0779375B1 (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 SA
Original Assignee
Ascometal SA
USINOR Sacilor SA
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9485504&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0779375(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ascometal SA, USINOR Sacilor SA filed Critical Ascometal SA
Publication of EP0779375A1 publication Critical patent/EP0779375A1/de
Application granted granted Critical
Publication of EP0779375B1 publication Critical patent/EP0779375B1/de
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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 the manufacture of a breakable mechanical part, and in particular for the manufacture of a connecting rod for an internal combustion engine.
  • Certain mechanical parts such as, for example, the connecting rods of an internal combustion engine consist of at least two separable elements assembled by fixing means such as screws. These parts can be made of 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 that ensure good service life of the connecting rods.
  • the mechanical characteristics generally required are a hardness between 210 HB and 360 HB and a breaking strength between 650 MPa and 1200 MPa. to obtain sufficient resistance to fatigue, and an elastic limit between 300 MPa and 800 MPa in order to avoid deformation by exceeding the elastic limit.
  • the precise choice of the characteristics required for a particular connecting rod intended for a particular engine depends on the design of the connecting rod and on the nature of the engine in which it is incorporated.
  • the steel which constitutes it is chosen as a function of these mechanical characteristics and of the manufacturing process which comprises, after forging, controlled cooling intended to obtain a ferritic-pearlitic structure which has the required mechanical characteristics and satisfactory machinability.
  • the steels used are, in general, carbon steels of the XC42 type or low alloy steels of the 45M5, 30MSV6, 38MVS5 type (according to French standard).
  • the carbon content is chosen mainly according to the level of hardness required, and the alloying elements are added either to increase the hardenability of the steel in order to increase the proportion of perlite, which is favorable for machinability, either to harden the ferrite and improve the yield strength to breaking strength ratio.
  • the separation of the different parts of the connecting rod can only be done by machining which requires a complex and costly range of machining.
  • the impurities taken from 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 drawback of having an irregular behavior during the fragile rupture operation, in particular because, it is practically impossible to control industrially the proportion of phase proeutectoid, this can vary from 0% to 15% depending on the exact chemical analysis of the steel and the manufacturing means used., which makes it difficult to use industrially, moreover, it does not make it possible to obtain that the characteristics specific to the XC70 which limits its use to the parts for which these characteristics are adapted.
  • the object of the present invention is to remedy these drawbacks by proposing a steel which makes it possible to obtain the mechanical characteristics required for a wide range of applications, in particular in the field of connecting rods, and good machinability, while making it possible to produce the fragile rupture operation under satisfactory industrial conditions.
  • the subject of the invention is a steel for the manufacture of a breakable mechanical part, the chemical composition of which comprises, by weight: 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%, possibly at least one element taken from lead, tellurium and selenium in contents of less than 0.1%, the rest being iron and impurities resulting from the production, 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% ⁇ Si ⁇ 1.2%, 0.05% ⁇ V ⁇ 0 , 15%.
  • the chemical composition of the steel can be such that: 0.65% ⁇ C ⁇ 0.75%, 0.2% ⁇ Si, 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%, 0.2% ⁇ Si, Ni ⁇ 0.15%, Cr ⁇ 0.15%, Mo ⁇ 0, 05%, Cu ⁇ 0.35%, with, preferably, 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 part.
  • This part can be, in particular, a connecting rod for an internal combustion engine 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 relatively large grains, whose ASTM size index of austenitic grains is less than 5, preferably having 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% of silicon, from 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% of aluminum.
  • This steel may be carbon steel, in which case it contains less than 0.5% of manganese. But it can also be 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.
  • a piece of steel according to the invention is supplied, it is heated to a temperature between 1100 ° C. and 1300 ° C. so. on the one hand to austenitize it. on the other hand to make the arain fat and, finally, to give it the ductility necessary for forging, then it is forged to give it the desired shape; forging ending at a temperature above 850 ° C.
  • it is cooled in a controlled manner to ambient temperature, for example in a cooling tunnel, at an average cooling rate between the end of forging temperature and 200 ° C. being between 0.5 ° C. / s and 15 ° C / s.
  • a ferrito-pearlitic structure is obtained with a majority of relatively large grains, the ASTM size index of the austenitic grain of which is less than 5, containing less than 30% ferrite, having the characteristics of hardness and traction. required, and a resilience of less than 7 Joules at room temperature.
  • the blank of the part thus obtained is then machined, then divided into two elements by fragile rupture caused by an impact.

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)
  • Treatment Of Steel In Its Molten State (AREA)
  • Powder Metallurgy (AREA)
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 true EP0779375A1 (de) 1997-06-18
EP0779375B1 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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0856590A2 (de) * 1997-02-04 1998-08-05 Daido Tokushuko Kabushiki Kaisha Hochfester nicht-thermischer Frischstahl für Warmschmieden und Verfahren zur Teilung von einem Schmiedestück aus dem nicht-thermischen Frischstahl
WO1999046420A1 (en) * 1998-03-10 1999-09-16 Corus Uk Limited Steel composition
EP1243665A1 (de) * 2001-03-21 2002-09-25 Daido Steel Company Limited Bruchtrennbarer wärmeunbehandelter Stahl zum Warmschmieden
EP1261748A1 (de) * 2000-02-15 2002-12-04 Cargill, Incorporated Stab, kolbenstangen, hydraulische zylinderund herstellungsverfahren dafür
DE19853259B4 (de) * 1997-11-18 2005-03-17 Isuzu Motors Ltd. Stahl für die Verwendung in Maschinenstrukturen und aus derartigem Stahl hergestellte Maschinenteile
EP3378957A1 (de) * 2017-03-23 2018-09-26 Ascometal France Holding SAS Stahl, herstellungsverfahren von mechanischen teilen aus diesem stahl, und so hergestellte teile

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2774098B1 (fr) * 1998-01-28 2001-08-03 Ascometal Sa Acier et procede pour la fabrication de pieces de mecanique secables
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
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
DE102006041146A1 (de) 2006-09-01 2008-03-06 Georgsmarienhütte Gmbh Stahl und Verarbeitungsverfahren für die Herstellung von höherfesten bruchtrennbaren Maschinenbauteilen
US8382912B2 (en) * 2007-11-28 2013-02-26 Kao Corporation Biofilm-removing agent
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
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
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
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
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2182758A (en) * 1938-05-14 1939-12-05 Inland Steel Co Steel
US2182759A (en) * 1938-08-15 1939-12-05 Inland Steel Co Steel
US4786466A (en) * 1987-02-19 1988-11-22 Frema, Inc. Low-sulfur, lead-free free machining steel alloy
US5055253A (en) * 1990-07-17 1991-10-08 Nelson & Associates Research, Inc. Metallic composition
US5135587A (en) 1991-04-01 1992-08-04 Ford Motor Company Machinable, strong, but crackable low ductility steel forging

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2402862A (en) * 1943-03-25 1946-06-25 Nat Tube Co Well casing
US4168159A (en) * 1978-02-28 1979-09-18 Latrobe Steel Company High speed steels with phosphorus for improved cutting performance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2182758A (en) * 1938-05-14 1939-12-05 Inland Steel Co Steel
US2182759A (en) * 1938-08-15 1939-12-05 Inland Steel Co Steel
US4786466A (en) * 1987-02-19 1988-11-22 Frema, Inc. Low-sulfur, lead-free free machining steel alloy
US5055253A (en) * 1990-07-17 1991-10-08 Nelson & Associates Research, Inc. Metallic composition
US5135587A (en) 1991-04-01 1992-08-04 Ford Motor Company Machinable, strong, but crackable low ductility steel forging

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0856590A2 (de) * 1997-02-04 1998-08-05 Daido Tokushuko Kabushiki Kaisha Hochfester nicht-thermischer Frischstahl für Warmschmieden und Verfahren zur Teilung von einem Schmiedestück aus dem nicht-thermischen Frischstahl
EP0856590A3 (de) * 1997-02-04 1998-10-21 Daido Tokushuko Kabushiki Kaisha Hochfester nicht-thermischer Frischstahl für Warmschmieden und Verfahren zur Teilung von einem Schmiedestück aus dem nicht-thermischen Frischstahl
DE19853259B4 (de) * 1997-11-18 2005-03-17 Isuzu Motors Ltd. Stahl für die Verwendung in Maschinenstrukturen und aus derartigem Stahl hergestellte Maschinenteile
WO1999046420A1 (en) * 1998-03-10 1999-09-16 Corus Uk Limited Steel composition
EP1261748A1 (de) * 2000-02-15 2002-12-04 Cargill, Incorporated Stab, kolbenstangen, hydraulische zylinderund herstellungsverfahren dafür
EP1261748A4 (de) * 2000-02-15 2004-12-15 Cargill Inc Stab, kolbenstangen, hydraulische zylinderund herstellungsverfahren dafür
EP1243665A1 (de) * 2001-03-21 2002-09-25 Daido Steel Company Limited Bruchtrennbarer wärmeunbehandelter Stahl zum Warmschmieden
EP3378957A1 (de) * 2017-03-23 2018-09-26 Ascometal France Holding SAS Stahl, herstellungsverfahren von mechanischen teilen aus diesem stahl, und so hergestellte teile
FR3064282A1 (fr) * 2017-03-23 2018-09-28 Asco Industries Acier, procede pour la fabrication de pieces mecaniques en cet acier, et pieces ainsi fabriquees

Also Published As

Publication number Publication date
PL192823B1 (pl) 2006-12-29
PT779375E (pt) 2000-10-31
CA2192509A1 (fr) 1997-06-15
NO965318D0 (no) 1996-12-12
DK0779375T3 (da) 2000-10-16
JPH09176796A (ja) 1997-07-08
CN1158908A (zh) 1997-09-10
DE69608773T2 (de) 2001-02-01
US5769970A (en) 1998-06-23
FR2742448A1 (fr) 1997-06-20
GR3034003T3 (en) 2000-11-30
KR970043238A (ko) 1997-07-26
AR004375A1 (es) 1998-11-04
MX9606392A (es) 1997-10-31
FR2742448B1 (fr) 1998-01-16
EP0779375B1 (de) 2000-06-07
ATE193733T1 (de) 2000-06-15
ES2148705T3 (es) 2000-10-16
PL317455A1 (en) 1997-06-23
DE69608773D1 (de) 2000-07-13
BR9606002A (pt) 1998-09-01
NO965318L (no) 1997-06-16

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