EP0277931B2 - Verschleissfestes Gusseisen mit hohem Phosphorgehalt - Google Patents

Verschleissfestes Gusseisen mit hohem Phosphorgehalt Download PDF

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Publication number
EP0277931B2
EP0277931B2 EP88870003A EP88870003A EP0277931B2 EP 0277931 B2 EP0277931 B2 EP 0277931B2 EP 88870003 A EP88870003 A EP 88870003A EP 88870003 A EP88870003 A EP 88870003A EP 0277931 B2 EP0277931 B2 EP 0277931B2
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EP
European Patent Office
Prior art keywords
cast iron
phosphorus
weight
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
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English (en)
French (fr)
Other versions
EP0277931A2 (de
EP0277931A3 (en
EP0277931B1 (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
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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(B2) "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
Application granted granted Critical
Publication of EP0277931B1 publication Critical patent/EP0277931B1/de
Publication of EP0277931B2 publication Critical patent/EP0277931B2/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
    • C22C37/00—Cast-iron alloys

Definitions

  • This phosphorus is generally added to cast iron in the form of ferro-phosphorus.
  • the incorporation is carried out during a second fusion in a cupola in which alternating charges of coke and a mixture of iron and ferro-phosphorus are previously put in place.
  • cast iron thus obtained has a Brinell hardness 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, the steadite, which has a Brinell hardness of approximately 440 HB. Its melting point is around 950 ° C. The steadite has a hardness much higher than that of ferrite or even perlite.
  • ferrite has a Brinell hardness of around 125 HB and perlite a Brinell hardness of approximately 220 HB.
  • the resulting ferrous alloy should contain at least 20% by weight of ferrite to present a Brinell hardness lower than 225 HB, as mentioned in Belgian Patent n ° 717.428.
  • the maximum hardness value of the cast iron was fixed to take into account the usual hardness of the tires rolling stock wheels.
  • cast iron alloys with characteristic microstructure comprising phosphorus present in the form of a network substantially continuous from a degenerate phosphorus eutectic between voluminous primary dendrite crystals.
  • Degenerate eutectic includes a matrix substantially continuous iron predominantly in the form ferrite or perlite.
  • This process provides a hardness ferritic cast iron relatively small. To make the pieces harder, it is therefore necessary to perform an annealing that this is obtained by prolonged heating for 1 to 6 hours of castings at a temperature included between 850 and 1,500 ° C, preferably 910 to 920 ° C.
  • the limitation of the ferrite content is linked to a phenomenon of micro-welding between the ferritic structure brake shoe and that of the tire, which has the effect of causing premature wear said wheel tire.
  • US-A-3767386 describes a high-grade cast iron phosphorus content for brake shoes, containing graphite having a mixed structure very fine nodular and vermicular. Cast iron has a sparse steadite structure, one of which only part is pearlitic so as to leave free field at any percentage of ferrite.
  • the invention proposes a method according to claim. Direct incorporation of ferro-phosphorus in the ladle, not in the fusion plant, also allows to obtain a better analysis accuracy of phosphorus content.
  • the invention also relates to cast irons according to claim 3.
  • 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 resistant ferrous alloy to wear.
  • the present invention suggests subjecting cast iron to a different treatment.
  • Undissolved iron therefore does not participate in the dilution carbon, so the carbon content goes down to a lesser extent than we could have predict theoretically and that it remains greater than 3%.
  • ferro-phosphorus is regulated so as to bring the phosphorus content to a value understood between 2.25 and 4.00% by weight.
  • the alloy has a composition corresponding typically gray cast iron, except for the content high in phosphorus, more than 2% by weight and a ferrite content of less than 5% by volume.
  • the iron according to the invention is perfectly suitable the manufacture of brake shoes for equipment railroads. It has excellent resistance to wear, as described in Belgian patent no. 717.428 and considerably reduces the formation of sparks. It also reduces the emission noise, since the graphite slats contribute to dampen the propagation of vibrations in hooves brakes.
  • the cast iron according to the invention has good flowability, due to the presence of phosphorus. She permits therefore to produce parts relatively accurately complicated.

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. Verfahren zum Herstellen eines Gusses hohen Phosphorgehalts, der einen hohen Widerstand gegen Abnutzung bietet und eine Brinellhärte niedriger als 270 HB hat, besonders zur Herstellung von Reibbremsvorrichtungen bestimmt und aus folgenden Bestandteilen zusammengesetzt ist:
    85 - 95 Gew.-% Eisen,
    2 - 10 Gew.-% Phosphor,
    < 6 % des Gesamtgewichts Kohlenstoff und Silizium,
    < 5 % des Gesamtgewichts aus folgenden Metallen:
    Mangan, Kobalt, Nickel, Vanadium, Chrom, Wolfram und Molybdän,
    dadurch gekennzeichnet, daß der Guß einen Mangangehalt hat, der wenigstens gleich dem durch die Formel Mn = 1,72S + 0,30 gefundenen ist, wobei S der Schwefelgehalt aufgrund der von dem Mangan gebundenen Sulfide ist, und daß Ferrophosphor einem in einer Gießpfanne oder einem Mischapparat enthaltenen flüssigen Guß zugesetzt wird, um den Phosphorgehalt darin derart zu steuern, daß ein Guß mit einem Gehalt von wenigstens 2,3 % Kohlenstoff in Form von blätterförmigem Graphit und die Bildung einer perlitischen Struktur zu erreichen, wobei der Guß weniger als 5 Vol.-% Ferrit enthält.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die zugesetzte Menge an Ferrophosphor etwa 10 Gew.-% des flüssigen Gusses beträgt.
  3. Guß hohen Phosphorgehalts, der zur Herstellung von Reibbremsvorrichtungen bestimmt ist, einen hohen Widerstand gegen Abnutzung bietet und aus folgenden Bestandteilen zusammengesetzt ist:
    85 - 95 Gew-% Eisen,
    2 - 10 Gew.-% Phosphor,
    < 6 % des Gesamtgewichts Kohlenstoff und Silizium,
    < 5 % des Gesamtgewichts aus folgenden Metallen: Mangan, Kobalt, Nickel, Vanadium, Chrom, Wolfram und Molybdän,
    und eine Brinellhärte niedriger als 270 HB hat,
    dadurch gekennzeichnet, daß er einen Gehalt an Mangan hat, der wenigstens gleich dem durch die Formel Mn 0 1,72 S + 0,30 gefundenen ist wobei S der Schwefelgehalt aufgrund der von dem Mangan gebunden Sulfide ist, einen Kohlenstoffgehalt von mehr als 3 %, wenigsten 2,3 Gew.-% Kohlenstoff in Form von blätterförmigem Graphit und eine perlitische Struktur hat, wobei der Guß weniger als 5 Vol.-% Ferrit enthält.
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
BE8700085A BE1000292A3 (fr) 1987-02-05 1987-02-05 Fonte a haute teneur en phosphore resistant a l'usure.
BE8700085 1987-02-05

Publications (4)

Publication Number Publication Date
EP0277931A2 EP0277931A2 (de) 1988-08-10
EP0277931A3 EP0277931A3 (en) 1988-09-07
EP0277931B1 EP0277931B1 (de) 1992-06-24
EP0277931B2 true 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
ES2321664T3 (es) * 2007-03-07 2009-06-09 Eisenwerk Arnstadt Gmbh Hierro colado para la produccion de piezas componentes para dispositivos de frenos de friccion y procedimiento para la produccion del hierro colado.
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
ATE77658T1 (de) 1992-07-15
ES2032602T5 (es) 2000-12-16
GR3034788T3 (en) 2001-02-28
DE3872262D1 (de) 1992-07-30
GR3005698T3 (de) 1993-06-07
NO170989C (no) 1993-01-06
DK173189B1 (da) 2000-03-13
EP0277931A2 (de) 1988-08-10
NO170989B (no) 1992-09-28
NO880496D0 (no) 1988-02-04
DK56488D0 (da) 1988-02-04
BE1000292A3 (fr) 1988-10-11
DE3872262T2 (de) 1992-12-03
EP0277931A3 (en) 1988-09-07
DK56488A (da) 1988-08-06
EP0277931B1 (de) 1992-06-24
ES2032602T3 (es) 1993-02-16
NO880496L (no) 1988-08-08

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