EP0277931B1 - Verschleissfestes Gusseisen mit hohem Phosphorgehalt - Google Patents

Verschleissfestes Gusseisen mit hohem Phosphorgehalt Download PDF

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Publication number
EP0277931B1
EP0277931B1 EP88870003A EP88870003A EP0277931B1 EP 0277931 B1 EP0277931 B1 EP 0277931B1 EP 88870003 A EP88870003 A EP 88870003A EP 88870003 A EP88870003 A EP 88870003A EP 0277931 B1 EP0277931 B1 EP 0277931B1
Authority
EP
European Patent Office
Prior art keywords
cast iron
weight
phosphorus
content
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
EP88870003A
Other languages
English (en)
French (fr)
Other versions
EP0277931A3 (en
EP0277931A2 (de
EP0277931B2 (de
Inventor
Herman Dehon
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.)
EURO RAIL AG
Original Assignee
ABEX RAIL SA
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3882504&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0277931(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ABEX RAIL SA filed Critical ABEX RAIL SA
Priority to AT88870003T priority Critical patent/ATE77658T1/de
Publication of EP0277931A2 publication Critical patent/EP0277931A2/de
Publication of EP0277931A3 publication Critical patent/EP0277931A3/fr
Publication of EP0277931B1 publication Critical patent/EP0277931B1/de
Application granted granted Critical
Publication of EP0277931B2 publication Critical patent/EP0277931B2/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys

Definitions

  • Document FR-A-1584012 discloses a cast iron with a high phosphorus content which, thanks to its wear resistance, can be used in friction braking devices.
  • the fact of having provided in this cast iron a content of at least 2% by weight of phosphorus makes it possible to reduce the wear by friction compared to that of the conventional gray cast iron which contains only 1% of phosphorus. It also reduces the emission of sparks during braking.
  • This phosphorus is generally added to cast iron in the form of ferro-phosphorus.
  • the incorporation is carried out during a second melting in a cupola in which alternating charges of coke and of a mixture of iron and ferro-phosphorus are previously put in place.
  • the cast iron thus obtained has a Brinell hardness of between 207 and 255 HB, while the ferrite content of the alloy is not specified.
  • Phosphorus promotes the segregation of graphite and gives rise to the formation of a ternary eutectic, steadite, which has a Brinell hardness of approximately 440 HB. Its melting point is around 950 ° C. Steadite has a much higher hardness than that of ferrite or even perlite.
  • ferrite has a Brinell hardness of approximately 125 HB and perlite a Brinell hardness of approximately 220 HB.
  • the value of the maximum hardness of cast iron has been fixed to take account of the usual hardness of the wheel treads of rolling stock.
  • Document FR-A-2,145,607 describes alloys of cast iron with a characteristic microstructure comprising phosphorus present in the form of a substantially continuous network of a eutectic of phosphorus degenerate between voluminous primary dendrite crystals.
  • the degenerate eutectic comprises a substantially continuous matrix of iron predominantly in the form of ferrite or perlite.
  • These cast iron alloys are obtained by melting together iron and ferro-phosphorus waste in an induction furnace and then annealing in an electrically heated mold.
  • This process provides a relatively low hardness ferritic iron.
  • it is therefore necessary to carry out an annealing which is obtained by prolonged heating for 1 to 6 hours of the parts cast at a temperature between 850 and 1,500 ° C., preferably 910 to 920 °. vs.
  • the limitation of the ferrite content is linked to a phenomenon of micro-welding between the ferritic structure of the brake shoe and that of the wheel tread, which has the effect of causing premature wear of said wheel tread.
  • the production of a pig iron corresponding to the preceding paragraph is carried out by adding ferro-phosphorus to the liquid pig iron collected in a ladle or a mixer and not in the melting installation.
  • the direct incorporation of ferro-phosphorus into the ladle also makes it possible to obtain better accuracy of analysis of the phosphorus content.
  • the cast irons according to the invention with a phosphorus content of between 2 and 10% by weight and a carbon content of at least 3% by weight, meet the hardness and ferrite content requirements.
  • the cast iron contains at least 2.3% by weight of carbon in the form of lamellar graphite.
  • cupola fusion is accompanied by the incorporation of ferro-phosphorus when it comes to obtaining a wear-resistant ferrous alloy.
  • the present invention suggests subjecting the cast iron to a different treatment.
  • Undissolved iron therefore does not participate in the dilution of carbon, so that the carbon content decreases to a lesser extent than what could have been theorized and that it remains greater than 3%.
  • ferro-phosphorus is adjusted so as to bring the phosphorus content to a value between 2.25 and 4.00% by weight.
  • the alloy has a composition typically corresponding to gray cast iron, except as regards the high phosphorus content, greater than 2% by weight and a ferrite content less than 5% by volume.
  • the cast iron according to the invention is perfectly suitable for the manufacture of brake shoes for railway equipment. It has excellent wear resistance, as described in Belgian Patent No. 717,428 and considerably reduces the formation of sparks. It also reduces noise emission, since the graphite slats help to dampen the propagation of vibrations in the brake shoes.
  • the cast iron according to the invention has good flowability, due to the presence of phosphorus. It therefore allows relatively complicated parts to be produced with precision.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Braking Arrangements (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Lubricants (AREA)

Claims (3)

1. Guß mit hohem Phosphorgehalt, der besonders für die Herstellung von Reibungsbremsvorrichtungen bestimmt ist, der hohen Widerstand gegen Abnutzung bietet, und aus folgenden Bestandteilen zusammengesetzt ist:
85 bis 95 Gew.-% Eisen
2 bis 10 Gew.-% Phosphor
weniger als 6% des Gesamtgewichts Kohlenstoff und Silizium
weniger als 5% des Gesamtgewichts der folgenden Metalle:
Mangan, Kobalt, Nickel, Vanadium, Chrom, Wolfram und Molybdän, und eine Brinellhärte niedriger als 270 HB aufweist, dadurch gekennzeichnet, daß er eine perlitische Struktur besitzt und wenigstens 2,3 Gew.-% Kohlenstoff in Form von blätterförmigem Graphit, weniger als 5 Vol.-% Ferrit und eine Manganmenge wenigstens gleich der durch die Formel Mn = 1,72 S + 0,30 gefundenen, in der S der Schwefelgehalt aufgrund der von dem Mangan gebundenen Sulfide ist, enthält.
2. Verfahren zur Herstellung eines Gusses wie in Anspruch 1 beschrieben, dadurch gekennzeichnet, daß man die Bildung einer perlitischen Struktur fördert durch Zufügen von Ferrophosphor zu einem in einer Gießpfanne oder einem Mischapparat enthaltenen, flüssigen Guß.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die zugefügte Menge an Ferrophosphoretwa 10 Gew.-% des flüssigen Gusses beträgt.
EP88870003A 1987-02-05 1988-01-14 Verschleissfestes Gusseisen mit hohem Phosphorgehalt Expired - Lifetime EP0277931B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88870003T ATE77658T1 (de) 1987-02-05 1988-01-14 Verschleissfestes gusseisen mit hohem phosphorgehalt.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8700085 1987-02-05
BE8700085A BE1000292A3 (fr) 1987-02-05 1987-02-05 Fonte a haute teneur en phosphore resistant a l'usure.

Publications (4)

Publication Number Publication Date
EP0277931A2 EP0277931A2 (de) 1988-08-10
EP0277931A3 EP0277931A3 (en) 1988-09-07
EP0277931B1 true EP0277931B1 (de) 1992-06-24
EP0277931B2 EP0277931B2 (de) 2000-08-30

Family

ID=3882504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88870003A Expired - Lifetime EP0277931B2 (de) 1987-02-05 1988-01-14 Verschleissfestes Gusseisen mit hohem Phosphorgehalt

Country Status (8)

Country Link
EP (1) EP0277931B2 (de)
AT (1) ATE77658T1 (de)
BE (1) BE1000292A3 (de)
DE (1) DE3872262T2 (de)
DK (1) DK173189B1 (de)
ES (1) ES2032602T5 (de)
GR (2) GR3005698T3 (de)
NO (1) NO170989C (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0130481B1 (ko) * 1993-02-03 1998-04-10 가나이 쯔도무 엘리베이터용 비상정지장치 및 엘리베이터
ATE421599T1 (de) * 2007-03-07 2009-02-15 Eisenwerk Arnstadt Gmbh Gusseisen zur herstellung von bauteilen für reibungsbremsvorrichtungen und verfahren zur herstellung des gusseisens
DE102015007229A1 (de) 2015-06-03 2016-12-08 Anstatt Schienenfahrzeuge-Kraftwerksanlagenbau Gmbh Metallurgisches Recycling von Rest-, Anfall- und Abfallstoffen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1527165A (en) * 1923-03-28 1925-02-24 Bauer Bros Co Alloy
US1690352A (en) * 1927-06-11 1928-11-06 Harry M Williams Heat-resisting alloy
US3193383A (en) * 1962-11-14 1965-07-06 Union Carbide Corp Iron base alloy
FR1528123A (fr) * 1966-05-09 1968-06-07 Albright & Wilson Mfg Ltd Alliages de fer à haute teneur en phosphore
GB1238646A (de) * 1967-07-07 1971-07-07
JPS516608B1 (de) * 1971-04-05 1976-03-01
GB1411216A (en) * 1971-07-13 1975-10-22 Albright & Wilson Casting iron alloys
US4352416A (en) * 1977-01-18 1982-10-05 Abex Corp. Cast iron railroad brake shoes

Also Published As

Publication number Publication date
ES2032602T3 (es) 1993-02-16
NO170989B (no) 1992-09-28
ES2032602T5 (es) 2000-12-16
EP0277931A3 (en) 1988-09-07
GR3034788T3 (en) 2001-02-28
NO880496D0 (no) 1988-02-04
GR3005698T3 (de) 1993-06-07
DK173189B1 (da) 2000-03-13
DE3872262T2 (de) 1992-12-03
DK56488D0 (da) 1988-02-04
BE1000292A3 (fr) 1988-10-11
NO880496L (no) 1988-08-08
ATE77658T1 (de) 1992-07-15
EP0277931A2 (de) 1988-08-10
DE3872262D1 (de) 1992-07-30
EP0277931B2 (de) 2000-08-30
NO170989C (no) 1993-01-06
DK56488A (da) 1988-08-06

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