EP0151244B1 - Grey cast iron alloy, process for its manufacture and uses thereof - Google Patents

Grey cast iron alloy, process for its manufacture and uses thereof Download PDF

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Publication number
EP0151244B1
EP0151244B1 EP84113932A EP84113932A EP0151244B1 EP 0151244 B1 EP0151244 B1 EP 0151244B1 EP 84113932 A EP84113932 A EP 84113932A EP 84113932 A EP84113932 A EP 84113932A EP 0151244 B1 EP0151244 B1 EP 0151244B1
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EP
European Patent Office
Prior art keywords
cast iron
content
material according
ncm
hardened
Prior art date
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Expired
Application number
EP84113932A
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German (de)
French (fr)
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EP0151244A1 (en
Inventor
Klaus Hornung
Werner Menk
Horst Gündisch
Kurt Kugler
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Georg Fischer AG
Original Assignee
Georg Fischer AG
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Application filed by Georg Fischer AG filed Critical Georg Fischer AG
Priority to AT84113932T priority Critical patent/ATE36873T1/en
Publication of EP0151244A1 publication Critical patent/EP0151244A1/en
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Publication of EP0151244B1 publication Critical patent/EP0151244B1/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/08—Making cast-iron alloys

Definitions

  • the present invention relates to a cast iron material with lamellar graphite for components whose surfaces are hardened in a remelting process, to a process for its production and its use.
  • Materials that are suitable for remelt hardening must meet certain quality requirements.
  • the primary requirement here is an at least approximately pore-free surface of the solidified melting path.
  • Magnesium is not present in gray cast iron. Because of the high carbon content, strong gas formation is to be expected under the influence of the high temperature of the TIG or plasma jet, which is the reason for porosity in gray cast iron.
  • the object of the invention is to remedy this, which consists in preventing the formation of pores on the surface.
  • a material with the composition The rest of iron and certain trace elements were treated with magnesium.
  • a cast material of comparable composition was not treated with magnesium.
  • the determination of the amount of gas showed a content of nitrogen of 7 Ncm3 / 100 g, for oxygen and hydrogen ⁇ 3 Ncm 3/100 g, so that the total content of the measured standard gases> g was 10 Ncm 3/100.
  • the number of pores per unit area was over 50.
  • the critical limit is about 9 g Ncm 3/100. Samples with values above this are not suitable for use on workpieces that have to be re-hardened.

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)
  • Manufacture And Refinement Of Metals (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Forging (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

1. Cast iron material with lamellar graphite for components whose surfaces are to be hardened in a remelt process, characterized in that in the untreated component the sum of the standard gas contents, such as nitrogen, hydrogen and oxygen is =< 9 Ncm**3/100g.

Description

Die vorliegende Erfindung bezieht sich auf einen Gußeisenwerkstoff mit Lamellengraphit für Bauteile deren Oberflächen in einem Umschmelzverfahren gehärtet werden, auf ein Verfahren zu dessen Herstellung sowie dessen Verwendung.The present invention relates to a cast iron material with lamellar graphite for components whose surfaces are hardened in a remelting process, to a process for its production and its use.

Werkstoffe, die für eine Umschmelzhärtung geeignet sind, müssen gewissen Qualitätsanforderungen genügen. In erster Linie steht hier die Forderung nach einer mindestens annähernd porenfreien Oberfläche der erstarrten Schmelzbahn.Materials that are suitable for remelt hardening must meet certain quality requirements. The primary requirement here is an at least approximately pore-free surface of the solidified melting path.

Es wurde beobachtet, daß das Umschmelzen von Sphäroguß bessere Ergebnisse zeigt als das von Grauguß. Dies ist darauf zurückzuführen, daß der Magnesiumanteil im Sphäroguß entweder eventuell entstehende Gase im Guß bindet oder aber von aus sen eingebrachte Gase bindet.It has been observed that remelting nodular cast iron shows better results than that of gray cast iron. This is due to the fact that the magnesium content in the spheroidal cast iron either binds any gases that may arise in the cast or binds gases introduced from outside.

Im Grauguß ist Magnesium nicht vorhanden. Wegen der hohen Kohlenstoffanteile ist daher unter Einwirkung der hohen Temperatur des WIG oder Plasmastrahles mit starker Gasbildung zu rechnen, worin der Grund für Porositäten beim Grauguß zu sehen ist.Magnesium is not present in gray cast iron. Because of the high carbon content, strong gas formation is to be expected under the influence of the high temperature of the TIG or plasma jet, which is the reason for porosity in gray cast iron.

Aufgabe der Erfindung ist es, hier Abhilfe zu schaffen, die darin besteht, dass die Entstehung von Poren an der Oberfläche verhindert wird.The object of the invention is to remedy this, which consists in preventing the formation of pores on the surface.

Diese Aufgabe wird durch die Lehre der Ansprüche 1 und 5 sowie 6 und 7 gelöst.This object is achieved by the teaching of claims 1 and 5 and 6 and 7.

Weitere vorteilhafte Ausführungen ergeben sich aus den abhängigen Ansprüchen.Further advantageous designs result from the dependent claims.

Anhand der nachfolgenden Beispiele soll die Erfindung näher erläutert werden.The invention will be explained in more detail with the aid of the following examples.

Ein Werkstoff mit der Zusammensetzung:

Figure imgb0001
Rest Eisen und gewisse Spurenelemente wurde mit Magnesium behandelt.A material with the composition:
Figure imgb0001
 The rest of iron and certain trace elements were treated with magnesium.

An einem aus diesem Werkstoff gefertigten Bauteil wurde nach erfolgter Umschmelzhärtung festgestellt, daß die Porenzahl pro Flächeneinheit in der Umschmelzzone < 3 war. Der Gesamtgasgehalt, gemessen im Zentrum der Probe, war kleiner als 9 Ncm3/100 g, wobei der Stickstoffgehalt innerhalb dieses Gesamtbereiches kleiner als 5,5 Ncm3/100 g war. Dabei entspricht die Masseinheit einem Normalkubikzentimeter pro 100 g.On a component made from this material, after remelt hardening, it was found that the number of pores per unit area in the remelting zone was <3. The total gas content measured in the center of the sample was less than 9 Ncm 3/100 g, wherein the nitrogen content within this overall area is smaller than 5.5 Ncm 3 / g was 100th The unit of measurement corresponds to a normal cubic centimeter per 100 g.

Zum Vergleich wurde ein Gußwerkstoff, vergleichbarer Zusammensetzung, nicht mit Magnesium behandelt. Die Ermittlung der Gasmenge ergab einen Gehalt für Stickstoff von 7 Ncm3/100 g, für Sauerstoff und Wasserstoff < 3 Ncm3/100 g, so daß der Gesamtgehalt der gemessenen Standardgase > 10 Ncm3/100 g betrug. Die Porenzahl pro Flächeneinheit lag über 50.For comparison, a cast material of comparable composition was not treated with magnesium. The determination of the amount of gas showed a content of nitrogen of 7 Ncm3 / 100 g, for oxygen and hydrogen <3 Ncm 3/100 g, so that the total content of the measured standard gases> g was 10 Ncm 3/100. The number of pores per unit area was over 50.

Der kritische Grenzwert liegt etwa bei 9 Ncm3/100 g. Proben deren Werte darüber liegen, sind für die Verwendung für Werkstücke, die umschmelzgehärtet werden müssen, nicht geeignet.The critical limit is about 9 g Ncm 3/100. Samples with values above this are not suitable for use on workpieces that have to be re-hardened.

Claims (7)

1. Cast iron material with lamellar graphite for components whose surfaces are to be hardened in a remelt process, characterised in that in the untreated component the sum of the standard gas contents, such as nitrogen, hydrogen and oxygen is < 9 Ncm3/100 g.
2. Material according to claim 1, characterised in that the nitrogen content is at the most 5,5 NCM 3/100 g.
3. Material according to claim 1, characterised in that the hydrogen content is at the most 1,0 Ncm3/100 g.
4. Material according to claim 1, characterised in that the oxygen content is at the most 3 Ncm3/100 g.
5. Process for the production of materials according to one of claims 1 to 4, characterised in that the reduction in the gas content is caused by degasification in which a dosed amount of magnesium is added to the melt.
6. Use of the material according to one of claims 1 to 4, for components whose surfaces are to be hardened in a remelt process.
7. Use of the material according to one of claims 1 to 4 for the production of a remelt- hardened surface with a pore content of approximately zero.
EP84113932A 1983-12-02 1984-11-17 Grey cast iron alloy, process for its manufacture and uses thereof Expired EP0151244B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84113932T ATE36873T1 (en) 1983-12-02 1984-11-17 ALLOY GRAY CAST IRON, PROCESS FOR ITS PRODUCTION AND ITS USE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6460/83 1983-12-02
CH6460/83A CH663036A5 (en) 1983-12-02 1983-12-02 CAST IRON MATERIAL FOR COMPONENTS.

Publications (2)

Publication Number Publication Date
EP0151244A1 EP0151244A1 (en) 1985-08-14
EP0151244B1 true EP0151244B1 (en) 1988-08-31

Family

ID=4309999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84113932A Expired EP0151244B1 (en) 1983-12-02 1984-11-17 Grey cast iron alloy, process for its manufacture and uses thereof

Country Status (4)

Country Link
EP (1) EP0151244B1 (en)
AT (1) ATE36873T1 (en)
CH (1) CH663036A5 (en)
DE (1) DE3473773D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2701717B1 (en) * 1993-02-17 1995-03-31 Peugeot Process for producing gray cast iron for surface reflow treatment.

Also Published As

Publication number Publication date
DE3473773D1 (en) 1988-10-06
CH663036A5 (en) 1987-11-13
EP0151244A1 (en) 1985-08-14
ATE36873T1 (en) 1988-09-15

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