EP0914485A1 - Austenitic nickel-chromium steel alloys - Google Patents

Austenitic nickel-chromium steel alloys

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Publication number
EP0914485A1
EP0914485A1 EP97937513A EP97937513A EP0914485A1 EP 0914485 A1 EP0914485 A1 EP 0914485A1 EP 97937513 A EP97937513 A EP 97937513A EP 97937513 A EP97937513 A EP 97937513A EP 0914485 A1 EP0914485 A1 EP 0914485A1
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Prior art keywords
hafnium
tantalum
nickel
zirconium
chromium
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EP97937513A
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German (de)
French (fr)
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EP0914485B1 (en
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Willi Kleemann
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Schmidt and Clemens GmbH and Co KG
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Schmidt and Clemens GmbH and Co
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent

Definitions

  • the invention relates to a heat-resistant, creep-resistant austenitic nickel-chromium steel alloy, as used in the petrochemical industry.
  • Such alloys require high strength, in particular creep rupture strength and sufficient toughness at the usual operating temperatures, as well as adequate corrosion resistance.
  • From US Pat. No. 4,077,801 is a molybdenum and cobalt-free austenitic nickel-chromium cast steel alloy with 0.25 to 0.8% carbon, up to 3.5% silicon, up to 3.0% manganese, 8 to 62% nickel , 12 to 32% chromium, up to 2% niobium, 0.05 to under 1.0% titanium, 0.05 to 2% tungsten and up to 0.3% nitrogen, the rest iron with a high creep rupture strength and ductility at high temperatures .
  • This cast alloy has good weldability and is suitable as a material for devices for hydrogen reforming.
  • the invention is therefore based on the problem of proposing a nickel-chromium steel alloy which can also withstand higher operating temperatures and at the same time has sufficient creep resistance and resistance to carburization and oxidation.
  • the solution to this problem is based on the idea of significantly improving the heat resistance of an austenitic nickel-chromium steel alloy with the aid of cobalt and molybdenum as well as certain intermetallic compounds.
  • Cobalt improves the stability of the austenitic iron-nickel-chromium structure. This applies in particular if the alloy for solid solution strengthening contains ferrite-stabilizing elements such as molybdenum.
  • the invention consists of an austenitic steel alloy with 0.3 to 1.0% carbon, 0.2 to 2.5% silicon, up to 0.8% manganese, 30.0 to 48.0% nickel, 16.0 up to 22.0% chromium, 0.5 to 18.0% cobalt, 1.5 to 4% molybdenum, 0.2 to 0.6% niobium, 0.1 to 0.5% titanium, 0.1 to 0 , 6% zirconium, 0.1 to 1.5% tantalum and 0.1 to 1.5% hafnium, with a ratio of the tantalum and hafnium content to the zirconium content of over 2.4%, their total tantalum, hafnium and Zirconium is 1.2 to 3%.
  • the steel alloy contains with cobalt contents of at least 10% over 20% iron and with cobalt contents under 10% over 30% iron.
  • the alloy has an austenitic iron-nickel-chromium or an austenitic iron-nickel-chromium-cobalt basic structure as well as a high creep resistance and creep resistance and is resistant to carburization and oxidation. Nevertheless, a further improvement in the fatigue strength at high temperatures is possible if the alloy contains 1.5 to 2.5% aluminum at the expense of its mandatory components and / or the tantalum, hafnium and zirconium contents satisfy the following condition:
  • An alloy with 0.42% carbon, 1.3% silicon, 0.40% manganese, 34.0% nickel, 19.0% chromium, 3.5% molybdenum, 0.40% niobium, 0 has proven particularly useful , 25% titanium, 0.30% zirconium, 0.15% tantalum and 0.80% hafnium, rest iron or also with 0.44% carbon, 1.2% silicon, 0.40% manganese, 33.0% Nickel, 19.0% chromium, 3.0% molybdenum, 0.40% niobium, 0.20% titanium, 0.15% zirconium, 1.0% tantalum and 0.10% hafnium, the rest iron.
  • Molybdenum improves the creep rupture strength at medium temperatures, while intermetallic carbide phases give the weak iron-nickel-chromium structure a high strength at temperatures above 0.9 of its absolute melting point.
  • Hafnium, zirconium, titanium, tantalum and niobium form primary carbides of the MC type, while chromium forms below Inclusion of molybdenum in the intra- and interdentritic areas forms carbides of the type M7C3 and M 23 6.
  • Fig. 2 a graphical representation of the influence of the total tantalum and hafnium content in relation to the zirconium content on the service life at a temperature of 1100 ° C. and an initial load of 9.4 MPA,
  • Fig. 3 the temporal weight gain in a hydrogen / propylene atmosphere at 1000 ° C and
  • compositions of the test alloys are shown in Table I below, which shows three conventional alloys 1, 2 and 3, comparative alloys 4 and 6 to 12 and alloys 5 and 13 to 17 according to the invention.
  • the rest of the alloy consisted of all Iron cases.
  • the alloys were melted in the medium frequency furnace and cast in investment casting molds or by centrifugal casting.
  • the samples for the creep rupture test were either produced from the near-final investment casting samples or by processing from the centrifugal cast pipes. Using these samples, the creep rupture behavior was determined according to ASTM E 139 in the as-cast state; the results of tests at 1100 ° C and two different loads are summarized in Table II below.
  • the diagram of FIG. 3 shows the measurement results and shows a parabolic reaction kinetics with the diffusion of carbon as the rate-determining step and a relatively narrow range of weight gain with the exception of alloy 17 with a weight gain that is almost a factor of 4 less than that conventional alloy 2 and the comparative alloy 7.
  • the results of the tests with alloys 4 and 6-12 demonstrate the ineffectiveness of adding primary carbide-forming elements on the creep behavior.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

A steel alloy contains 0.3 to 1.0 % carbon, 0.2 to 2.5 % silicium, up to 0.8 % manganese, 30.0 to 48.0 % nickel, 16.0 to 22.0 % chromium, 0.5 to 18.0 % cobalt, 1.5 to 4 % molybdenum, 0.2 to 0.6 %niobium, 0.1 to 0.5 % titanium, 0.1 to 0.6 % zirconium, 0.1 to 1.5 % tantalum and 0.1 to 1.5 % hafnium, the remaining percentage being made up of over 20 % iron when the cobalt content equals or exceeds 10 % and of over 30 % iron when the cobalt content is lower than 10 %. The steel alloy is particularly useful as heat-resistant and heating resistant materials for parts, in particular pipes of petrochemical cracking furnaces for producing ethylene or synthesis gas.

Description

"Austenitische Nickel -Chrom-Stahlleαi erung" "Austenitic nickel-chromium steel alloy"
Die Erfindung bezieht sich auf eine hitzebeständige, kriechfeste austenitische Nickel-Chrom-Stahllegierung, wie sie in der petrochemischen Industrie zur Verwendung kommt .The invention relates to a heat-resistant, creep-resistant austenitic nickel-chromium steel alloy, as used in the petrochemical industry.
Derartige Legierungen bedürfen einer hohen Festigkeit, insbesondere Zeitstandfestigkeit und einer ausreichenden Zähigkeit bei den üblichen Betriebstemperaturen sowie einer hinreichenden Korrosionsbeständigkeit.Such alloys require high strength, in particular creep rupture strength and sufficient toughness at the usual operating temperatures, as well as adequate corrosion resistance.
Aus der US-Patentschrift 4 077 801 ist eine molybdän- und kobaltfreie austenitische Nickel -Chrom-Gußstahllegierung mit 0,25 bis 0,8% Kohlenstoff, bis 3,5% Silizium, bis 3,0% Mangan, 8 bis 62% Nickel, 12 bis 32% Chrom, bis 2% Niob, 0,05 bis unter 1,0% Titan, 0,05 bis 2% Wolfram und bis 0,3% Stickstoff, Rest Eisen mit einer hohen Zeitstandfestigkeit und Duktilitat bei hohen Temperaturen bekannt. Diese Gußlegierung besitzt eine gute Schweißbarkeit und eignet sich als Werkstoff für Vorrichtungen zum Wasserstoff-Reformieren.From US Pat. No. 4,077,801 is a molybdenum and cobalt-free austenitic nickel-chromium cast steel alloy with 0.25 to 0.8% carbon, up to 3.5% silicon, up to 3.0% manganese, 8 to 62% nickel , 12 to 32% chromium, up to 2% niobium, 0.05 to under 1.0% titanium, 0.05 to 2% tungsten and up to 0.3% nitrogen, the rest iron with a high creep rupture strength and ductility at high temperatures . This cast alloy has good weldability and is suitable as a material for devices for hydrogen reforming.
Probleme ergeben sich jedoch angesichts der ansteigenden Verfahrenstemperaturen und der daraus resultierenden Verringerung der Lebensdauer in Folge der sich mit zunehmender Temperatur verringernden Kriechfestigkeit und der abnehmenden Aufkohlungs- und Oxidationsbestän- digkeit .However, problems arise in view of the rising process temperatures and the resulting ones Reduction of the service life as a result of the creep resistance, which decreases with increasing temperature, and the decreasing carburization and oxidation resistance.
Der Erfindung liegt daher das Problem zugrunde, eine Nickel -Chrom-Stahllegierung vorzuschlagen, die auch höheren Betriebstemperaturen gewachsen ist und dabei eine ausreichende Kriechfestigkeit sowie Aufkohlungs- und Oxidationsbeständigkeit besitzt.The invention is therefore based on the problem of proposing a nickel-chromium steel alloy which can also withstand higher operating temperatures and at the same time has sufficient creep resistance and resistance to carburization and oxidation.
Die Lösung dieser Aufgabe basiert auf dem Gedanken, die Hitzebeständigkeit einer austenitischen Nickel -Chrom- Stahllegierung mit Hilfe von Kobalt und Molybdän sowie bestimmter intermetallischer Verbindungen wesentlich zu verbessern. Kobalt verbessert dabei die Stabilität des austenitischen Eisen-Nickel -Chrom-Grundgefüges . Dies gilt insbesondere, wenn die Legierung zur Mischkristallverfestigung ferritstabilisierende Elemente wie Molybdän enthält.The solution to this problem is based on the idea of significantly improving the heat resistance of an austenitic nickel-chromium steel alloy with the aid of cobalt and molybdenum as well as certain intermetallic compounds. Cobalt improves the stability of the austenitic iron-nickel-chromium structure. This applies in particular if the alloy for solid solution strengthening contains ferrite-stabilizing elements such as molybdenum.
Im einzelnen besteht die Erfindung in einer austenitischen Stahllegierung mit 0,3 bis 1,0% Kohlenstoff, 0,2 bis 2,5% Silizium, bis 0,8% Mangan, 30,0 bis 48,0% Nickel, 16,0 bis 22,0% Chrom, 0,5 bis 18,0% Kobalt, 1,5 bis 4% Molybdän, 0,2 bis 0,6% Niob, 0,1 bis 0,5% Titan, 0,1 bis 0,6% Zirkonium, 0,1 bis 1,5% Tantal und 0,1 bis 1,5% Hafnium, mit einem Verhältnis der Gehalte an Tantal und Hafnium zum Zirkoniumgehalt von über 2,4%, deren Gesamtgehalt an Tantal, Hafnium und Zirkonium 1,2 bis 3% beträgt. Die Stahllegierung enthält bei Kobaltgehalten von mindestens 10% über 20% Eisen und bei Kobaltgehalten unter 10% über 30% Eisen.In particular, the invention consists of an austenitic steel alloy with 0.3 to 1.0% carbon, 0.2 to 2.5% silicon, up to 0.8% manganese, 30.0 to 48.0% nickel, 16.0 up to 22.0% chromium, 0.5 to 18.0% cobalt, 1.5 to 4% molybdenum, 0.2 to 0.6% niobium, 0.1 to 0.5% titanium, 0.1 to 0 , 6% zirconium, 0.1 to 1.5% tantalum and 0.1 to 1.5% hafnium, with a ratio of the tantalum and hafnium content to the zirconium content of over 2.4%, their total tantalum, hafnium and Zirconium is 1.2 to 3%. The steel alloy contains with cobalt contents of at least 10% over 20% iron and with cobalt contents under 10% over 30% iron.
Die Legierung besitzt ein austenitisches Eisen-Nickel - Chrom- oder ein austenitisches Eisen-Nickel -Chrom- Kobalt-Grundgefüge sowie eine hohe Zeitstand- bzw. Kriechfestigkeit und ist sowohl aufkohlungs- als auch oxidationsbeständig. Dennoch ist eine weitere Verbesserung der ZeitStandfestigkeit bei hohen Temperaturen möglich, wenn die Legierung auf Kosten ihrer zwingenden Bestandteile 1,5 bis 2,5% Aluminium enthält und/oder die Gehalte an Tantal, Hafnium und Zirkonium der folgenden Bedingung genügen:The alloy has an austenitic iron-nickel-chromium or an austenitic iron-nickel-chromium-cobalt basic structure as well as a high creep resistance and creep resistance and is resistant to carburization and oxidation. Nevertheless, a further improvement in the fatigue strength at high temperatures is possible if the alloy contains 1.5 to 2.5% aluminum at the expense of its mandatory components and / or the tantalum, hafnium and zirconium contents satisfy the following condition:
[(% Ta) + (% Hf)] / (% Zr) = 1,2 bis 14[(% Ta) + (% Hf)] / (% Zr) = 1.2 to 14
Besonders bewährt hat sich eine Legierung mit 0,42% Kohlenstoff, 1,3% Silizium, 0,40% Mangan, 34,0% Nickel, 19,0% Chrom, 3,5% Molybdän, 0,40% Niob, 0,25% Titan, 0,30% Zirkonium, 0,15% Tantal und 0,80% Hafnium, Rest Eisen oder auch mit 0,44% Kohlenstoff, 1,2% Silizium, 0,40% Mangan, 33,0% Nickel, 19,0% Chrom, 3,0% Molybdän, 0,40% Niob, 0,20% Titan, 0,15% Zirkonium, 1,0% Tantal und 0,10% Hafnium, Rest Eisen.An alloy with 0.42% carbon, 1.3% silicon, 0.40% manganese, 34.0% nickel, 19.0% chromium, 3.5% molybdenum, 0.40% niobium, 0 has proven particularly useful , 25% titanium, 0.30% zirconium, 0.15% tantalum and 0.80% hafnium, rest iron or also with 0.44% carbon, 1.2% silicon, 0.40% manganese, 33.0% Nickel, 19.0% chromium, 3.0% molybdenum, 0.40% niobium, 0.20% titanium, 0.15% zirconium, 1.0% tantalum and 0.10% hafnium, the rest iron.
Molybdän verbessert die Zeitstandfestigkeit bei mittleren Temperaturen, während intermetallische Karbidphasen dem an sich schwachen Eisen-Nickel -Chrom- Grundgefüge eine hohe Festigkeit bei Temperaturen bis über 0,9 ihres absoluten Schmelzpunkts verleihen. Hafnium, Zirkonium, Titan, Tantal und Niob bilden primäre Karbide des Typs MC, während Chrom unter Einschluß des Molybdäns in den intra- und interdentritischen Bereichen Karbide des Typs M7C3 und M23 6 bildet.Molybdenum improves the creep rupture strength at medium temperatures, while intermetallic carbide phases give the weak iron-nickel-chromium structure a high strength at temperatures above 0.9 of its absolute melting point. Hafnium, zirconium, titanium, tantalum and niobium form primary carbides of the MC type, while chromium forms below Inclusion of molybdenum in the intra- and interdentritic areas forms carbides of the type M7C3 and M 23 6.
Die Erfindung wird nachfolgend anhand von Ausführungs- beispielen des näheren erläutert. In der Zeichnung zeigen:The invention is explained below with reference to exemplary embodiments. The drawing shows:
Fig. 1: eine graphische Darstellung der Bruchzeit beim Zeitstandversuch in Abhängigkeit vom Gesamtgehalt an Hafnium und Tantal im Verhältnis zum Zirkoniumgehalt bei einer Temperatur von 1100° C und hoher Belastung,1: a graphical representation of the breaking time in the creep test as a function of the total content of hafnium and tantalum in relation to the zirconium content at a temperature of 1100 ° C. and high load,
Fig . 2 : eine graphische Darstellung des vom Gesamtgehalt an Tantal und Hafnium im Verhältnis zum Zirkoniumgehalt ausgehenden Einflusses auf die Standzeit bei einer Temperatur von 1100° C und einer Anfangsbelastung von 9,4 MPA,Fig. 2: a graphical representation of the influence of the total tantalum and hafnium content in relation to the zirconium content on the service life at a temperature of 1100 ° C. and an initial load of 9.4 MPA,
Fig. 3: die zeitliche Gewichtszunahme in einer Wasserstoff/Propylen-Atmosphäre bei 1000° C undFig. 3: the temporal weight gain in a hydrogen / propylene atmosphere at 1000 ° C and
Fig. 4: die Oxidationsbeständigkeit der Stahllegierung als zeitliche Gewichtszunahme bei einem Glühen an Luft bei einer Temperatur von 1050° C.4: the oxidation resistance of the steel alloy as a temporal increase in weight when annealed in air at a temperature of 1050 ° C.
Die Zusammensetzungen der Versuchslegierungen ergeben sich aus der nachfolgenden Tabelle I, die drei herkömm- liehen Legierungen 1, 2 und 3, Vergleichslegierungen 4 und 6 bis 12 sowie erfindungsgemäße Legierungen 5 und 13 bis 17 wiedergibt. Der Legierungsrest bestand in allen Fällen aus Eisen. Die Legierungen wurden im Mittel - frequenzofen erschmolzen und in Feingußformen oder im Schleudergießverfahren vergossen .The compositions of the test alloys are shown in Table I below, which shows three conventional alloys 1, 2 and 3, comparative alloys 4 and 6 to 12 and alloys 5 and 13 to 17 according to the invention. The rest of the alloy consisted of all Iron cases. The alloys were melted in the medium frequency furnace and cast in investment casting molds or by centrifugal casting.
Die Proben für den Zeitstandversuch wurden entweder aus den endmaßnahen Feingußproben oder durch Bearbeiten aus den Schleudergußrohren hergestellt. Unter Verwendung dieser Proben wurde das Zeitstandverhalten nach ASTM E 139 im Gußzustand ermittelt; die Ergebnisse von Versuchen bei 1100° C und zwei verschiedenen Belastungen sind in der nachfolgenden Tabelle II zusammengestellt.The samples for the creep rupture test were either produced from the near-final investment casting samples or by processing from the centrifugal cast pipes. Using these samples, the creep rupture behavior was determined according to ASTM E 139 in the as-cast state; the results of tests at 1100 ° C and two different loads are summarized in Table II below.
Die Daten der Zeitstandversuche, die minimale Kriechgeschwindigkeit und der Zeitpunkt für den Beginn des ter- tiären Kriechens machen deutlich, daß die erfindungsgemäßen Legierungen angesichts ihrer Gehalte an starken Karbidbildnern den Vergleichslegierungen merklich überlegen sind. So veranschaulichen die Diagramme der Fig. 1 und 2 die deutliche Überlegenheit der erfin- dungsgemäßen Legierungen hinsichtlich ihrer Zeitstandfestigkeit bei erhöhten Temperaturen in Abhängigkeit vom Gesamtgehalt an intermetallische Phasen bildenden Legierungen oberhalb eines bestimmten Gehaltsniveaus auf dem Hintergrund eines bestimmten Chromgehaltes, eines bestimmten Mindestgehalts an Nickel, Nickel und Kobalt sowie Molybdän. Dabei zeigt sich, daß die Verbesserung der Zeitstandfestigkeit und des Kriechverhalten einerseits auf dem erfindungsgemäßen Gewichtsverhältnis des Gesamtgehalts an Tantal und Hafnium zum Zirkonium- Gehalt und andererseits auf der Beeinflussung desThe data from the creep tests, the minimum creep speed and the time for the start of tertiary creep make it clear that the alloys according to the invention are markedly superior to the comparative alloys in view of their contents of strong carbide formers. 1 and 2 illustrate the clear superiority of the alloys according to the invention with regard to their creep rupture strength at elevated temperatures as a function of the total content of alloys forming intermetallic phases above a specific content level against the background of a specific chromium content, a specific minimum content of nickel, Nickel and cobalt as well as molybdenum. It shows that the improvement in creep rupture strength and creep behavior is based on the weight ratio according to the invention of the total tantalum and hafnium content to the zirconium content and on the other hand on influencing the
Grundgefüges durch Chrom und/oder Nickel plus Kobalt basiert . Zur Ermittlung der Aufkohlungsbeständigkeit wurden Proben bei 900° C und bei 1000° C in einer Atmosphäre aus Wasserstoff und Propylen mit einem Volumenverhältnis von 89 : 11 bei einem Volumendurchsatz von 601 ml/min untersucht. Dabei wurde die Menge der Kohlenstoffauf - nähme unter Verwendung einer Mikrowaage kontinuierlich gemessen.Basic structure based on chrome and / or nickel plus cobalt. To determine the carburization resistance, samples were examined at 900 ° C. and at 1000 ° C. in an atmosphere of hydrogen and propylene with a volume ratio of 89:11 at a volume throughput of 601 ml / min. The amount of carbon absorption was continuously measured using a microbalance.
Das Diagramm der Fig. 3 gibt die Meßergebnisse wieder und zeigt eine parabolische Reaktionskinetik mit der Diffusion von Kohlenstoff als geschwindigkeitsbestimmendem Schritt sowie einen verhältnismäßig engen Bereich der Gewichtszunahme mit Ausnahme der Legierung 17 mit einer Gewichtszunahme, die beinahe um einen Faktor 4 geringer ist als bei der herkömmlichen Legierung 2 und der Vergleichslegierung 7. Die Ergebnisse der Versuche mit den Legierungen 4 und 6-12 belegen die Wirkungslosigkeit der Zugabe primärkarbidbildender Ele- mente auf das Zeitstandverhalten.The diagram of FIG. 3 shows the measurement results and shows a parabolic reaction kinetics with the diffusion of carbon as the rate-determining step and a relatively narrow range of weight gain with the exception of alloy 17 with a weight gain that is almost a factor of 4 less than that conventional alloy 2 and the comparative alloy 7. The results of the tests with alloys 4 and 6-12 demonstrate the ineffectiveness of adding primary carbide-forming elements on the creep behavior.
Die Ergebnisse gravimetrischer Oxidationsversuche an Luft bei 1050° C und einer Versuchsdauer von 25 Stunden veranschaulicht das Diagramm der Fig. 4 mit seiner ebenfalls parabolischen Abhängigkeit, die das überlegene Oxidationsverhalten der erfindungsgemäßen Versuchslegierung 16 im Vergleich zu der herkömmlichen Versuchslegierung 2 deutlich macht. O 98/04757The results of gravimetric oxidation tests in air at 1050 ° C. and a test duration of 25 hours are illustrated by the diagram in FIG. 4 with its also parabolic dependency, which makes the superior oxidation behavior of the test alloy 16 according to the invention clear in comparison to the conventional test alloy 2. O 98/04757
- 7 -- 7 -
Tabelle 1Table 1
9 10 1 1 12 13 14 16 1 6 1 79 10 1 1 12 13 14 16 1 6 1 7
84006/4.3 84006/4.31 64006/806 84006/806 84006/907 84006/808 84006/808 84006/8.1 84006/8.384006 / 4.3 84006 / 4.31 64006/806 84006/806 84006/907 84006/808 84006/808 84006 / 8.1 84006 / 8.3
368 366 361 363 367 368 377 379 383368 366 361 363 367 368 377 379 383
31.60 32.16 36.76 37.24 33.27 33.24 33.01 32.31 31.2931.60 32.16 36.76 37.24 33.27 33.24 33.01 32.31 31.29
22.40 23.64 23.21 • 34.417 19.14 19.14 19.17 18.61 17.6622.40 23.64 23.21 • 34.417 19.14 19.14 19.17 18.61 17.66
3.00 3.160 3.100 3.060 3.200 3.040 3.260 3.160 3.0803.00 3.160 3.100 3.060 3.200 3.040 3.260 3.160 3.080
1.420 1.840 1.380 1.300 1.360 1.210 1.380 1.240 .681,420 1,840 1,380 1,300 1,360 1,210 1,380 1,240 .68
.43 .46 .446 .466 .46 .44 .400 .436 .420.43 .46 .446 .466 .46 .44 .400 .436 .420
.40 .37 .37 .37 .38 .37 .41 .40 .41.40 .37 .37 .37 .38 .37 .41 .40 .41
.37 .40 .38 AO .36 .40 • .37 .38 .38.37 .40 .38 AO .36 .40 • .37 .38 .38
.36 - .18 .17 - .18 .21 .17 .21 .21 .26.36 - .18 .17 - .18 .21 .17 .21 .21 .26
14.61 16.32 .61 .06 .32 .03 <.01 16.70 14.2614.61 16.32 .61 .06 .32 .03 <.01 16.70 14.26
.048 .028 .029"" .021 .024 .021 .026 .028 1.660.048 .028 .029 " " .021 .024 .021 .026 .028 1,660
.71 * 1.030 .84 .22 .97 1.010 .79 .097 1.230.71 * 1,030 .84 .22 .97 1,010 .79 .097 1,230
1.200 .67 .68 .13 . .82 .12 .84 .86 1.2801,200 .67 .68 .13. .82 .12 .84 .86 1,280
.386 .263 .166 .134 .128 .164 .343 .392 .464.386 .263 .166 .134 .128 .164 .343 .392 .464
.018 .017 .019 .019 .017 .016 .019 .017 .018.018 .017 .019 .019 .017 .016 .019 .017 .018
<.006 <.006 <.006 <.006 <.006 <.006 <.006 <.006 < .006<.006 <.006 <.006 <.006 <.006 <.006 <.006 <.006 <.006
R R R R . R R R R R Tabelle 2RRRR. RRRRR Table 2

Claims

"Austenitische Nickel -Chrom-Stahlleαierunσ"Patentansprüche : "Austenitic nickel-chromium steel alloy" Claims:
1. Hitzebeständige und hoch armfeste austenitische Nickel -Chrom-Stahllegierung mit hoher Zeitstandfestigkeit und Aufkohlungsbeständigkeit aus1. Heat-resistant and highly arm-resistant austenitic nickel-chromium steel alloy with high creep rupture strength and carburization resistance
0,3 bis 1,0% Kohlenstoff0.3 to 1.0% carbon
0,2 bis 2,5% Silizium bis 0,8% Mangan 30,0 bis 48,0% Nickel 16,0 bis 22 % Chrom 0,5 bis 18,0% Kobalt0.2 to 2.5% silicon to 0.8% manganese 30.0 to 48.0% nickel 16.0 to 22% chromium 0.5 to 18.0% cobalt
1,5 bis 4 % Molybdän 0,2 bis 0,6% Niob 0, 1 bis 0, 5% Titan 0,1 bis 0,6% Zirkonium 0,1 bis 1,5% Tantal1.5 to 4% molybdenum 0.2 to 0.6% niobium 0.1 to 0.5% titanium 0.1 to 0.6% zirconium 0.1 to 1.5% tantalum
0,1 bis 1,5% Hafnium0.1 to 1.5% hafnium
Rest über 20% Eisen bei einem Kobaltgehalt von mindestens 10% oder über 30% Eisen bei einem Kobaltgehalt unter 10%, mit einem Verhältnis des Gesamtgehalts an Tantal und Hafnium zum Zirkoniumgehalt von über 2,4, bei einem Gesamtgehalt an Tantal, Hafnium und Zirkonium von 1,2 bis 3,0%.Remainder over 20% iron with a cobalt content of at least 10% or over 30% iron with one Cobalt content below 10%, with a ratio of the total content of tantalum and hafnium to the zirconium content of more than 2.4, with a total content of tantalum, hafnium and zirconium of 1.2 to 3.0%.
2. Legierung nach Anspruch 1 mit 1,5 bis 2,5% Aluminium.2. Alloy according to claim 1 with 1.5 to 2.5% aluminum.
3. Legierung nach Anspruch 1 oder 2 mit 0,42% Kohlen- stoff, 1,3% Silizium, 0,40% Mangan, 34,0% Nickel,3. Alloy according to claim 1 or 2 with 0.42% carbon, 1.3% silicon, 0.40% manganese, 34.0% nickel,
19,0% Chrom, 3,5% Molybdän, 0,40% Niob, 0,25% Titan, 0,30% Zirkonium, 0,15% Tantal und 0,80% Hafnium, Rest Eisen.19.0% chromium, 3.5% molybdenum, 0.40% niobium, 0.25% titanium, 0.30% zirconium, 0.15% tantalum and 0.80% hafnium, the rest iron.
4. Legierung nach einem der Ansprüche 1 bis 3 mit 0,44% Kohlenstoff, 1,2% Silizium, 0,40% Mangan, 33,0% Nickel, 19,0% Chrom, 3,0% Molybdän, 0,40% Niob, 0,20% Titan, 0,15% Zirkonium, 1,00% Tantal und 0,15% Hafnium, Rest Eisen.4. Alloy according to one of claims 1 to 3 with 0.44% carbon, 1.2% silicon, 0.40% manganese, 33.0% nickel, 19.0% chromium, 3.0% molybdenum, 0.40 % Niobium, 0.20% titanium, 0.15% zirconium, 1.00% tantalum and 0.15% hafnium, balance iron.
5. Legierung nach einem der Ansprüche 1 bis 4, bei der das Gewichtsverhältnis des Gesamtgehalts an Tantal und Hafnium zum Zirkoniumgehalt 2,5 bis 14 beträgt.5. Alloy according to one of claims 1 to 4, wherein the weight ratio of the total tantalum and hafnium to zirconium content is 2.5 to 14.
6. Verwendung einer Legierung nach einem der Ansprüche 1 bis 5 als Werkstoff zum Herstellen von Gegenständen mit hoher Zeitstandfestigkeit bei hohen Temperaturen sowie hoher Aufkohlungs- und Oxidationsbe- ständigkeit .6. Use of an alloy according to one of claims 1 to 5 as a material for the production of objects with high creep rupture strength at high temperatures and high carburization and oxidation resistance.
Verwendung einer Legierung nach einem der Ansprüche 1 bis 5 als Werkstoff zum Herstellen von Rohren und Fittings von Crackanlagen zum Herstellen von Äthylen oder Synthesegas. Use of an alloy according to one of claims 1 to 5 as a material for producing pipes and Cracking system fittings for the production of ethylene or syngas.
EP97937513A 1996-07-25 1997-07-23 Austenitic nickel-chromium steel alloys Expired - Lifetime EP0914485B1 (en)

Applications Claiming Priority (3)

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DE19629977 1996-07-25
DE19629977A DE19629977C2 (en) 1996-07-25 1996-07-25 Austenitic nickel-chrome steel alloy workpiece
PCT/EP1997/003975 WO1998004757A1 (en) 1996-07-25 1997-07-23 Austenitic nickel-chromium steel alloys

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DE19629977A1 (en) 1998-01-29
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DE19629977C2 (en) 2002-09-19
JP3710097B2 (en) 2005-10-26
DE59707227D1 (en) 2002-06-13
WO1998004757A1 (en) 1998-02-05
EP0914485B1 (en) 2002-05-08
JP2000513767A (en) 2000-10-17
US20010001399A1 (en) 2001-05-24
CA2261736A1 (en) 1998-02-05

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