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 PDFInfo
- 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- cast iron
- content
- material according
- ncm
- hardened
- 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
Links
- 238000000034 method Methods 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 229910001060 Gray iron Inorganic materials 0.000 title description 4
- 229910045601 alloy Inorganic materials 0.000 title 1
- 239000000956 alloy Substances 0.000 title 1
- 239000000463 material Substances 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000001257 hydrogen Substances 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 239000001301 oxygen Substances 0.000 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 3
- 239000010439 graphite Substances 0.000 claims abstract description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 4
- 238000007872 degassing Methods 0.000 claims 1
- 239000000155 melt Substances 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
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)
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Forging (AREA)
Abstract
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:
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)
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)
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. |
-
1983
- 1983-12-02 CH CH6460/83A patent/CH663036A5/en not_active IP Right Cessation
-
1984
- 1984-11-17 AT AT84113932T patent/ATE36873T1/en not_active IP Right Cessation
- 1984-11-17 EP EP84113932A patent/EP0151244B1/en not_active Expired
- 1984-11-17 DE DE8484113932T patent/DE3473773D1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ATE36873T1 (en) | 1988-09-15 |
DE3473773D1 (en) | 1988-10-06 |
CH663036A5 (en) | 1987-11-13 |
EP0151244A1 (en) | 1985-08-14 |
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