EP0750686B1 - Corrosion and wear-resistant chill casting - Google Patents

Corrosion and wear-resistant chill casting Download PDF

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EP0750686B1
EP0750686B1 EP95912186A EP95912186A EP0750686B1 EP 0750686 B1 EP0750686 B1 EP 0750686B1 EP 95912186 A EP95912186 A EP 95912186A EP 95912186 A EP95912186 A EP 95912186A EP 0750686 B1 EP0750686 B1 EP 0750686B1
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percent
corrosion
wear
carbides
weight
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French (fr)
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EP0750686A1 (en
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Anja Dwars
Wolfgang Prechtl
Jörg SCHRÖPFER
Hermann Tischner
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KSB AG
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    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/06—Cast-iron alloys containing chromium
    • C22C37/08—Cast-iron alloys containing chromium with nickel

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  • a typical representative of this group is the material G-X 170 CrMo 25 2.
  • a decisive disadvantage this group of materials is that the corrosion resistance in chemically aggressive media, for example in acidic (pH 3), chloride-containing (50 g / l Cl) water from flue gas desulfurization plants, only at very high Cr contents is achieved.
  • the invention has for its object a metallic To create cast material that stands out through a high Excellent corrosion resistance in aggressive media and the wear resistance of the commercially available Chilled cast iron comes close.
  • Vanadium is an element of the fifth subgroup, his Associated carbides are characterized by good wetting properties and less solubility than chromium carbide in Fe-based alloys. At the same time, the solubility in Liquidus state higher than that of niobium carbide, so that vanadium-rich carbides predominantly only in a late stage the solidification or form only in the solid state, whereby a spatially uniform distribution of the carbides without Gravity increases are achieved. This is one for Achieving good wear resistance is necessary Requirement.
  • vanadium-rich carbides as carriers of wear resistance are on a par with other special carbides.
  • the vanadium-rich Mixed carbides are also due to their shape and the resulting resulting lower notch effect from fracture mechanics Visibility favorable. Vanadium remaining in the matrix has an effect does not adversely affect the mechanical properties.
  • the molybdenum content is within the specified content limits essential for corrosion resistance, especially in acidic media containing chloride.
  • the Cu content is limited to 3% by mass to avoid the risk of cracking to reduce when casting thick-walled parts.
  • Low Copper contents result in better corrosion resistance in oxidizing media and are therefore part of commercially available high-alloy duplex steels.
  • Another Advantage of the permissible in the material according to the invention Cu content is the possibility when melting Recycled material from commercially available, high-alloy cast steel to use.
  • niobium content will limited to a maximum of 4% by weight in order to eliminate to avoid primary niobium carbides in the melt as this strong due to their different density to the matrix seize.
  • the material according to the invention due to the lower Cr content of the carbides, less susceptibility to corrosion, especially against selective corrosion.
  • Another advantage of this material is that for a given Wear resistance the corrosion resistance through Variation of the alloy elements relevant to corrosion chemistry can be set according to the requirement profile, it should be noted that with increasing alloy content the Manufacturability (castability, machinability) is difficult.
  • the material of the invention shows in relation to the Combination of corrosion and wear resistance clear superiority compared to the previously known, chilled cast iron grades used for hydroabrasive wear.
  • Model wear apparatus used, in which as Aggressive quartz sand-water in a mixture ratio of 1: 1 with a grain size of 0.9-1.2 mm was used. The test duration was two hours each. there has been a Speed of 3000 rpm. Every material sample had a diameter of 55 mm and a thickness of 5 mm.
  • the ordinates of the diagrams shown in FIGS. 1 and 2 each show the removal in mm / a.
  • the letters A to D are used to document known materials, which are described in more detail in a subsequent first table, while the identifications E (1) to E (3) relate to three variants of the material according to the invention, the composition of which is set out in a second table is.
  • Known materials used for the tests Labelling Nickname A GX 250 CrMo 15 3 B GX 170 CrMo 25 2 C.
  • GX 40 CrNiMo 27 5 Alloy composition of the materials according to the invention used for the tests Labelling C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Ceramic Products (AREA)
  • Fuel Cell (AREA)
  • Powder Metallurgy (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PCT No. PCT/EP95/00759 Sec. 371 Date Sep. 17, 1996 Sec. 102(e) Date Sep. 17, 1996 PCT Filed Mar. 2, 1995 PCT Pub. No. WO95/25826 PCT Pub. Date Sep. 28, 1995A corrosion and wear-resistant chill cast part is formed from an iron composition comprising from 26 to 36 percent Cr; 0 to 10 percent Ni; 2 to 6 percent Mo; 0 to 3 percent Cu; 0 to 0.2 percent N; 0 to 1.5 percent Si; 0 to 1.5 percent Mn; 4 to 9 percent V; and 1.4 to 1.9 percent C. All percents are by weight of the total composition. The remainder of the composition is Fe and impurities.

Description

Bei hydroabrasiver Verschleißbeanspruchung ist der Einsatz von C-haltigem Cr-Hartguß auf Fe-Basis Stand der Technik. Ein Guß dieser Sorte zeichnet sich durch einen C-Gehalt von über 2,0 Gewichts-% aus. Als Beispiel hierfür seien die Werkstoffe Nr. 0.9630, Nr. 0.9635, Nr. 0.9645 und Nr. 0.9655 genannt. Bedingt durch den hohen Verbrauch an Cr zur Carbidbildung weisen diese Werkstoffe allerdings keine über das Maß von unlegiertem Gußeisen hinausgehende Korrosionsbeständigkeit auf.In the case of hydroabrasive wear, the use of State-of-the-art, C-containing Cr hard cast iron based on Fe. A cast This variety is characterized by a C content of over 2.0% by weight. The materials are an example of this No. 0.9630, No. 0.9635, No. 0.9645 and No. 0.9655. Due to the high consumption of Cr for carbide formation however, these materials do not exceed the dimension of unalloyed cast iron on corrosion resistance.

Durch Absenkung des C-Gehaltes und Erhöhung des Cr-Gehaltes ist es möglich, die Korrosionsbeständigkeit leicht zu erhöhen, wobei jedoch eine verringerte Verschleißbeständigkeit in Kauf genommen werden muß. Ein typischer Vertreter dieser Gruppe ist der Werkstoff G-X 170 CrMo 25 2. Ein entscheidender Nachteil dieser Werkstoffgruppe ist, daß die Korrosionsbeständigkeit in chemisch aggressiven Medien, beispielsweise in sauren (pH 3), chloridhaltigen (50 g/l Cl) Wässern von Rauchgas-Entschwefelungsanlagen, erst bei sehr hohen Cr-Gehalten erreicht wird. Hohe Cr-Gehalte in Fe-Basis-Legierungen, wie z. B. bei den bekannten Werkstoffen G-X 160 CrNiMoCu 42 2 2 2 bzw. G-X 140 CrMnNiMoCu 41 4 2 2 1, haben aber den Nachteil, daß sie die mechanischen Eigenschaften entscheidend verschlechtern und die Gießbarkeit erheblich beeinträchtigen. By lowering the C content and increasing the Cr content it is possible to slightly increase the corrosion resistance, however, a reduced wear resistance in purchase must be taken. A typical representative of this group is the material G-X 170 CrMo 25 2. A decisive disadvantage this group of materials is that the corrosion resistance in chemically aggressive media, for example in acidic (pH 3), chloride-containing (50 g / l Cl) water from flue gas desulfurization plants, only at very high Cr contents is achieved. High Cr contents in Fe-based alloys, e.g. B. with the known materials G-X 160 CrNiMoCu 42 2 2 2 or G-X 140 CrMnNiMoCu 41 4 2 2 1, but have the disadvantage that they the mechanical properties deteriorate significantly and significantly affect the castability.

Aus diesem Grund werden für die genannten aggressiven Medien korrosionsbeständige Edelstähle verwendet, deren Verschleißbeständigkeit durch die Zugabe geringer Kohlenstoffgehalte (< 0,5 %) und den sich dadurch ergebenden geringen Volumenanteil an Carbiden leicht verbessert werden kann. Ein typisches Beispiel hierfür ist der Werkstoff 1.4464. Durch die Bildung der Chromcarbide sinkt der Chromgehalt des Grundgefüges und die Korrosionsbeständigkeit verringert sich entsprechend. Daher ist eine weitere Erhöhung des Kohlenstoffgehaltes nicht zweckmäßig.For this reason, aggressive media are mentioned for corrosion-resistant stainless steels are used, their wear resistance by adding low levels of carbon (<0.5%) and the resulting low volume fraction of carbides can be easily improved. A typical one An example of this is material 1.4464. Through education the chromium carbide reduces the chromium content of the basic structure and the Corrosion resistance is reduced accordingly. thats why a further increase in the carbon content is not appropriate.

Eine Möglichkeit zur Vermeidung einer Chromverarmung der Matrix bei höheren Kohlenstoffgehalten ist die Zugabe anderer carbidbildender Elemente. Dies wird bei Stählen mit niedrigen Chromgehalten (< 20 %) praktiziert, die bei schwach korrosiven Medien eingesetzt werden können. Beispiel hierfür ist die DE-A-42 02 339. Als besonders vorteilhaft wurde der Zusatz von Niob angesehen, da dieses Legierungselement reine MC-Carbide bildet. Das Element Vanadium wurde hierfür als nicht günstig betrachtet, da es mit Chrom und Eisen Mischcarbide bildet, die als weniger verschleißbeständig gelten.One way to avoid chromium depletion of the matrix at higher carbon levels, the addition of others carbide-forming elements. This is the case with steels with low Chromium contents (<20%) practiced in the case of weakly corrosive Media can be used. An example of this is the DE-A-42 02 339. The addition of was particularly advantageous Considered niobium because this alloying element is pure MC carbide forms. The element vanadium was not considered favorable for this considered, since it forms mixed carbides with chromium and iron, which are considered less wear-resistant.

Weiterhin sind Versuche bekannt, die chemisch-tribologische Beständigkeit des hoch chromhaltigen Werkstoffes 1.4464 durch die Zugabe geringer Mengen Niob, Vanadium oder Titan zu erhöhen (M. Pohl, A. Ibach, A. Oldewurtel: Neue Guß- und Schmiedestähle mit verbesserter chemisch/tribologischer Beständigkeit. Tagungsband zur 5. Präsentation TRIBOLOGIE 1991, Koblenz, Seite 368 bis 376). Bedingt durch den beibehaltenen geringen Kohlenstoffgehalt konnte die Verschleißbeständigkeit aber nur teilweise gering verbessert werden.Experiments are also known, the chemical-tribological Resistance of the high chrome material 1.4464 through increase the addition of small amounts of niobium, vanadium or titanium (M. Pohl, A. Ibach, A. Oldewurtel: New cast and forged steels with improved chemical / tribological resistance. Conference proceedings for the 5th presentation TRIBOLOGIE 1991, Koblenz, Pages 368 to 376). Due to the retained low However, the wear resistance was only able to contain carbon partially improved slightly.

Der Erfindung liegt die Aufgabe zugrunde, einen metallischen Gußwerkstoff zu schaffen, der sich durch eine hohe Korrosionsbeständigkeit in aggressiven Medien auszeichnet und der in seiner Verschleißbeständigkeit den handelsüblichen Hartgußsorten nahekommt.The invention has for its object a metallic To create cast material that stands out through a high Excellent corrosion resistance in aggressive media and the wear resistance of the commercially available Chilled cast iron comes close.

Erreicht wird dies durch einen Hartguß mit der im kennzeichnenden Teil des Anspruches 1 genannten Zusammensetzung. Neben einer hohen Korrosions- und Verschleißbeständigkeit besitzt dieser Gußwerkstoff auch eine gute Gießbarkeit, was dessen Herstellung in konventionellen Edelstahlgießerein ermöglicht. Außerdem ist dieser Hartguß gut bearbeitbar.This is achieved by a chill cast with the in characterizing part of claim 1 mentioned Composition. In addition to high corrosion and wear resistance this cast material also has a good one Pourability, what its manufacture in conventional Stainless steel foundry enables. This cast iron is also good editable.

Erreicht wird dies vor allem durch den Chromgehalt von 26 bis 36 Gewichts-%, einen Kohlenstoffgehalt von 1,4 bis 1,9 Gewichts-%, der einen ausreichend hohen Volumenanteil an Carbiden bewirkt, und einen Vanadiumgehalt von mehr als 4 Gewichts-%, der durch die Bildung von vanadiumreichen Carbiden die Chromverarmung der Matrix verringert. Dadurch kann die sonst notwendige überproportionale Erhöhung des Chromgehaltes vermieden werden.This is achieved primarily through the chromium content of 26 to 36% by weight, a carbon content of 1.4 to 1.9 % By weight of a sufficiently high volume fraction Carbides and a vanadium content of more than 4 % By weight resulting from the formation of vanadium-rich carbides the chromium depletion of the matrix is reduced. This allows the otherwise necessary disproportionate increase in the chromium content be avoided.

Aus der Zugabe von Vanadium ergeben sich noch weitere Vorteile. Vanadium ist ein Element der fünften Nebengruppe, seine zugehörigen Carbide zeichnen sich durch gute Benetzungseigenschaften und eine geringere Löslichkeit als Chromcarbid in Fe-Basis-Legierungen aus. Gleichzeitig ist die Löslichkeit im Liquiduszustand höher als die des Niobcarbides, so daß sich vanadiumreiche Carbide vorwiegend erst in einem späten Stadium der Erstarrung bzw. erst im festen Zustand bilden, wodurch eine räumlich gleichmäßige Verteilung der Carbide ohne Schwerkraftseigerungen erreicht wird. Dies ist eine zur Erzielung guter Verschleißbeständigkeit notwendige Voraussetzung. There are other advantages to adding vanadium. Vanadium is an element of the fifth subgroup, his Associated carbides are characterized by good wetting properties and less solubility than chromium carbide in Fe-based alloys. At the same time, the solubility in Liquidus state higher than that of niobium carbide, so that vanadium-rich carbides predominantly only in a late stage the solidification or form only in the solid state, whereby a spatially uniform distribution of the carbides without Gravity increases are achieved. This is one for Achieving good wear resistance is necessary Requirement.

Weiterhin hat sich entgegen bisherigen Annahmen gezeigt, daß vanadiumreiche Carbide als Träger der Verschleißbeständigkeit anderen Sondercarbiden ebenbürtig sind. Die vanadiumreichen Mischcarbide sind zudem aufgrund ihrer Form und der daraus resultierenden geringeren Kerbwirkung aus bruchmechanischer Sicht günstig. In der Matrix verbleibendes Vanadium wirkt sich nicht nachteilig auf die mechanischen Eigenschaften aus.Furthermore, contrary to previous assumptions, it has been shown that vanadium-rich carbides as carriers of wear resistance are on a par with other special carbides. The vanadium-rich Mixed carbides are also due to their shape and the resulting resulting lower notch effect from fracture mechanics Visibility favorable. Vanadium remaining in the matrix has an effect does not adversely affect the mechanical properties.

Der Molybdän-Gehalt in den vorgegebenen Gehaltsgrenzen ist wesentlich für die Korrosionsbeständigkeit, vor allem in chloridhaltigen sauren Medien.The molybdenum content is within the specified content limits essential for corrosion resistance, especially in acidic media containing chloride.

Der Cu-Gehalt wird auf 3 MA-% beschränkt, um die Rißgefahr beim Abguß von dickwandigen Teilen zu verringern. Geringe Kupfergehalte bewirken eine bessere Korrosionsbeständigkeit in oxidierenden Medien und sind deshalb Bestandteil von handelsüblichen hochlegierten Duplex-Stählen. Ein weiterer Vorteil des im erfindungsgemäßen Werkstoff zulässigen Cu-Gehaltes ist die Möglichkeit, beim Erschmelzen Recyclingmaterial von handelsüblichem, hochlegiertem Stahlguß zu verwenden.The Cu content is limited to 3% by mass to avoid the risk of cracking to reduce when casting thick-walled parts. Low Copper contents result in better corrosion resistance in oxidizing media and are therefore part of commercially available high-alloy duplex steels. Another Advantage of the permissible in the material according to the invention Cu content is the possibility when melting Recycled material from commercially available, high-alloy cast steel to use.

Durch die gezielte Zugabe des Austenitbildners Nickel im Konzentrationsbereich von 6 bis 10 MA-% nach Patentanspruch 2 kann das Verhältnis der Phasenanteile Ferrit und Austenit in der Matrix definiert eingestellt werden. Die positiven Eigenschaften eines Duplex-Gefüges in rostfreien Stählen sind bekannt. Die extrem hohe Sprödigkeit der Hartgußsorten mit hohen C-Gehalten und einem Carbid-Netz in ferritischer Matrix wird durch die überwiegende Einlagerung der vanadiumreichen Carbide in der austenitischen Phase vermieden. Da diese im Gegensatz zur Ferritphase nicht durch Ausscheidung intermetallischer Phasen oder durch Entmischungsvorgänge versprödet, ist die Rißgefahr bei Spannungen zwischen Carbiden und Matrix nicht so groß wie bei rein ferritischer Matrix. Through the targeted addition of the austenite former nickel in the Concentration range from 6 to 10 MA% according to claim 2 can the ratio of the phase fractions ferrite and austenite in defined in the matrix. The positive ones Properties of a duplex structure in stainless steels are known. The extremely high brittleness of the chilled cast iron grades high C contents and a carbide network in a ferritic matrix is due to the predominant storage of the vanadium-rich Carbides avoided in the austenitic phase. Since this in In contrast to the ferrite phase, not by precipitation intermetallic phases or by segregation processes embrittled, there is a risk of tearing between carbides and matrix is not as large as with a purely ferritic matrix.

Um einen Gefügeaufbau, bestehend aus einer ferritischaustenitischen Matrix mit eingelagerten Carbiden zu erreichen, ist eine Wärmebehandlung bei üblichen Lösungsglühtemperaturen notwendig, gleichzeitig wird hierdurch eine bessere Bearbeitbarkeit erreicht.To a structure consisting of a ferritic-austenitic To achieve a matrix with embedded carbides, is a heat treatment at usual solution annealing temperatures necessary, at the same time this will make a better one Machinability achieved.

Zusätzlich bietet sich die Möglichkeit, durch weitere gezielte Wärmebehandlungen entsprechend den ZTU-Schaubildern von hochlegierten Stählen die bekannte Neigung des Ferrits zur Bildung von Ausscheidungen zur Härtesteigerung zu nutzen und somit die Verschleißbeständigkeit zusätzlich zu erhöhen.In addition, there is the possibility of further targeted Heat treatments according to the ZTU diagrams from high-alloy steels the known tendency of the ferrite to Use excretions to increase hardness and thus additionally increasing the wear resistance.

Gemäß Patentanspruch 3 wird ein auf maximal 4 Gewichts-% begrenzter Niobanteil dem Hartguß beigefügt, um so die Möglichkeit einer sekundären Ausscheidung von eutektoiden Niobcarbiden zu ermöglichen, welche zu einer Erhöhung der Verschleißbeständigkeit beitragen können. Der Niobgehalt wird auf maximal 4 Gewichts-% begrenzt, um die Ausscheidung von primären Niobcarbiden in der Schmelze zu vermeiden, da diese aufgrund ihrer unterschiedlichen Dichte zur Matrix stark seigern.According to claim 3, a maximum of 4% by weight limited amount of niobium added to the chilled cast iron, so that Possibility of secondary excretion of eutectoids To enable niobium carbides, which lead to an increase in Wear resistance can contribute. The niobium content will limited to a maximum of 4% by weight in order to eliminate to avoid primary niobium carbides in the melt as this strong due to their different density to the matrix seize.

Im Vergleich zu den Chromhartgußsorten zeigt der erfindungsgemäße Werkstoff, bedingt durch den niedrigeren Cr-Gehalt der Carbide, eine geringere Korrosionsanfälligkeit, insbesondere gegen selektive Korrosion.In comparison to the types of chrome cast iron, the material according to the invention, due to the lower Cr content of the carbides, less susceptibility to corrosion, especially against selective corrosion.

Ein weiterer Vorteil dieses Werkstoffes ist, daß bei gegebener Verschleißbeständigkeit die Korrosionsbeständigkeit durch Variation der korrosionschemisch relevanten Legierungselemente entsprechend dem Anforderungsprofil eingestellt werden kann, wobei zu beachten ist, daß mit zunehmendem Legierungsgehalt die Herstellbarkeit (Gießbarkeit, spanende Bearbeitbarkeit) erschwert wird. Another advantage of this material is that for a given Wear resistance the corrosion resistance through Variation of the alloy elements relevant to corrosion chemistry can be set according to the requirement profile, it should be noted that with increasing alloy content the Manufacturability (castability, machinability) is difficult.

Der erfindungsgemäße Werkstoff zeigt in bezug auf die Kombination von Korrosions- und Verschleißbeständigkeit eine deutliche Überlegenheit im Vergleich zu den bisher bekannten, für hydroabrasiven Verschleiß eingesetzten Hartgußsorten.The material of the invention shows in relation to the Combination of corrosion and wear resistance clear superiority compared to the previously known, chilled cast iron grades used for hydroabrasive wear.

Dies läßt sich anhand eines als Beispiel dienenden Vergleichs verdeutlichen, in welchem drei Varianten des erfindungsgemäßen Werkstoffs vier bekannter Hartgußsorten gegenübergestellt werden. Es zeigt die

Fig. 1
ein Diagramm der Abtragsraten der Werkstoffe bei hydroabrasivem Verschleiß, und die
Fig. 2
ein Diagramm der Korrosionsraten in starksaurem Medium (pH 0,5; 10 g/l Cl - ; 60 °C).
This can be illustrated on the basis of an example comparison in which three variants of the material according to the invention are compared with four known types of chilled cast iron. It shows the
Fig. 1
a diagram of the removal rates of the materials in the case of hydroabrasive wear, and the
Fig. 2
a diagram of the corrosion rates in strongly acidic medium (pH 0.5; 10 g / l Cl -; 60 ° C).

Für die Ermittlung der Abtragsraten gemäß Fig. 1 wurde eine Modellverschleiß-Apparatur eingesetzt, in welcher als Angriffsmittel Quarzsand-Wasser in einem Mischungsverhältnis von 1:1 mit einer Korngröße von 0,9 - 1,2 mm verwendet wurde. Die Versuchsdauer betrug jeweils zwei Stunden. Es wurde eine Drehzahl von 3000 1/min gefahren. Jede Werkstoffprobe hatte einen Durchmesser von 55 mm und eine Dicke von 5 mm.1 was used to determine the removal rates Model wear apparatus used, in which as Aggressive quartz sand-water in a mixture ratio of 1: 1 with a grain size of 0.9-1.2 mm was used. The test duration was two hours each. there has been a Speed of 3000 rpm. Every material sample had a diameter of 55 mm and a thickness of 5 mm.

Die Ordinaten der in dem Fig. 1 und 2 dargestellten Diagramme zeigen jeweils den Abtrag in mm/a. Auf den Abszissen sind mit den Buchstaben A bis D bekannte, in einer nachfolgenden ersten Tafel näher bezeichnete Werkstoffe belegt, während sich die Kennzeichnungen E (1) bis E (3) auf drei Varianten des erfindungsgemäßen Werkstoffes beziehen, deren Zusammensetzung in einer zweiten Tafel dargelegt ist. Für die Versuche herangezogene bekannte Werkstoffe Kennzeichnung Kurzname A G-X 250 CrMo 15 3 B G-X 170 CrMo 25 2 C G-X 3 CrNiMoCu 24 6 D G-X 40 CrNiMo 27 5 Legierungszusammensetzung der für die Versuche benutzten erfindungsgemäßen Werkstoffe Kennzeichnung C Si Mn Cr Ni Mo Cu V Fe E (1) 1,5 0,8 0,6 26,6 7,9 2,6 1,8 5,2 Rest E (2) 1,5 1,2 0,8 30,1 8,2 2,4 1,7 5,0 Rest E (3) 1,8 0,8 0,9 31,8 8,7 2,8 1,8 8,9 Rest The ordinates of the diagrams shown in FIGS. 1 and 2 each show the removal in mm / a. On the abscissa, the letters A to D are used to document known materials, which are described in more detail in a subsequent first table, while the identifications E (1) to E (3) relate to three variants of the material according to the invention, the composition of which is set out in a second table is. Known materials used for the tests Labelling Nickname A GX 250 CrMo 15 3 B GX 170 CrMo 25 2 C. GX 3 CrNiMoCu 24 6 D GX 40 CrNiMo 27 5 Alloy composition of the materials according to the invention used for the tests Labelling C. Si Mn Cr Ni Mon Cu V Fe E (1) 1.5 0.8 0.6 26.6 7.9 2.6 1.8 5.2 rest E (2) 1.5 1.2 0.8 30.1 8.2 2.4 1.7 5.0 rest E (3) 1.8 0.8 0.9 31.8 8.7 2.8 1.8 8.9 rest

Claims (5)

  1. Corrosion-resistant and wear-resistant cast alloy characterized by the following composition in per cent by weight:
    Cr = 26 to 36
    Ni ≤ 10
    Mo = 2 to 6
    Cu ≤ 3
    N ≤ 0.2
    Si ≤ 1.5
    Mn ≤ 1.5
    V = 4 to 9
    C = 1.4 to 1.9
    remainder Fe and impurities resulting from the melting process.
  2. Cast alloy according to Claim 1, characterized by a nickel content of from 6 to 10 per cent by weight.
  3. Cast alloy according to Claim 1 or 2, characterized by up to 4 per cent by weight Nb as a further constituent at the expense of the Fe remainder.
  4. Use of a cast alloy according to any of Claims 1 to 3 for components which come into contact with flowing solids-containing, corrosive media.
  5. Use of a cast alloy according to any of Claims 1 to 3 for pumps and valves which come into contact with solids-containing, corrosive media.
EP95912186A 1994-03-18 1995-03-02 Corrosion and wear-resistant chill casting Expired - Lifetime EP0750686B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4409278 1994-03-18
DE4409278A DE4409278A1 (en) 1994-03-18 1994-03-18 Corrosion and wear resistant chilled cast iron
PCT/EP1995/000759 WO1995025826A1 (en) 1994-03-18 1995-03-02 Corrosion and wear-resistant chill casting

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EP0750686A1 EP0750686A1 (en) 1997-01-02
EP0750686B1 true EP0750686B1 (en) 1998-06-10

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US (1) US5795540A (en)
EP (1) EP0750686B1 (en)
JP (1) JPH10500449A (en)
CN (1) CN1044494C (en)
AT (1) ATE167238T1 (en)
AU (1) AU678107B2 (en)
BR (1) BR9506610A (en)
DE (2) DE4409278A1 (en)
ES (1) ES2120187T3 (en)
WO (1) WO1995025826A1 (en)

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DE4409278A1 (en) 1995-09-21
JPH10500449A (en) 1998-01-13
ES2120187T3 (en) 1998-10-16
BR9506610A (en) 1997-09-09
CN1143982A (en) 1997-02-26
CN1044494C (en) 1999-08-04
US5795540A (en) 1998-08-18
EP0750686A1 (en) 1997-01-02
ATE167238T1 (en) 1998-06-15
AU1947795A (en) 1995-10-09
WO1995025826A1 (en) 1995-09-28
DE59502510D1 (en) 1998-07-16
AU678107B2 (en) 1997-05-15

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