EP0010755A1 - Use of manganese and nickel-containing fine-grained structural steel - Google Patents

Use of manganese and nickel-containing fine-grained structural steel Download PDF

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EP0010755A1
EP0010755A1 EP79104222A EP79104222A EP0010755A1 EP 0010755 A1 EP0010755 A1 EP 0010755A1 EP 79104222 A EP79104222 A EP 79104222A EP 79104222 A EP79104222 A EP 79104222A EP 0010755 A1 EP0010755 A1 EP 0010755A1
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Prior art keywords
nickel
manganese
steel
structural steel
steel according
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German (de)
French (fr)
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EP0010755B2 (en
EP0010755B1 (en
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Constantin M. Dr. Ing. Vlad
Klaus Dipl.-Ing. Hulka
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Stahlwerke Pein Salzgitter AG
Preussag Stahl AG
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Stahlwerke Pein Salzgitter AG
Preussag Stahl 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

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  • the invention relates to a manganese-nickel fine-grained structural steel with 0.04 to 0.09% carbon, 1.2 to 1.8% manganese, 0.1 to 0.4% silicon, 0.03 to 0.08% Niobium, up to 0.025% aluminum, up to 0.015% sulfur, 0.5 to 1.5% nickel and optionally 0.2 to 0.4% copper, balance iron including melting-related impurities.
  • An alloy steel of the aforementioned type is known from German Offenlegungsschrift 24 07 338; it contains 0.01 to 0.10% carbon, 0.5 to 2% manganese, 0.1 to 0.9% silicon, 0.001 to 0.10% niobium, 0.01 to 0.3% aluminum and 1, 4 to 3.5% nickel.
  • This steel has a certain cold strength if it has been hot rolled in a controlled manner depending on the nickel content.
  • hot rolling controlled as a function of the respective nickel content proves to be difficult and, in particular, complex in practice.
  • the cold toughness of this steel is not sufficient to use the steel at temperatures such as that of liquid methane and, in particular, liquid ethylene.
  • the invention is based on the object of proposing an alloy steel that can be welded, a high yield strength at room temperature and cold toughness, and resistance to hydrogen cracks sits and is therefore particularly suitable as a material for welded parts that, like pipes and containers, serve for the transport and storage of liquid gases even in the presence of hydrogen sulfide and water.
  • the steel is to liquid ethylene bestatiiund temperatures to -120 0 C grown in.
  • the steel Even in the hard-rolled and tempered condition, the steel has a high notched impact strength and a transition temperature that allows use at temperatures down to -70 ° C despite its very low nickel content.
  • the full material properties only develop when the proposed steel has been normalized and, if necessary, also tempered.
  • the steel After such a heat treatment, the steel has a room temperature yield point of at least 420 N / mm 2 and a transition temperature of the impact strength of 51 J / cm 2 transverse to the rolling direction of at least -120 0 C and a notched impact strength of at least 280 J / cm 2 at room temperature .
  • the steel contains 0.2 to 0.4% copper, its crack resistance is particularly high in the presence of traces of hydrogen sulfide. This is of considerable importance insofar as liquefied gases often contain traces of hydrogen sulfide, which has a corrosive effect when water is present and leads in particular to hydrogen-induced cracks.
  • the low carbon content of the steel on the one hand requires good welding behavior and promotes on the other hand the notched impact strength. Overall, the excellent properties of the proposed steel are explained in the synergistic interaction of nickel, niobium and manganese.
  • the steel is preferably annealed until the core temperature is 30 to 50 ° C above the AC 3 point and then annealed for 2 to 4 minutes at 550 to 650 ° C, in particular at 630 0 C, for 2 millimeters of material thickness in order to adjust the cold toughness .
  • the steels examined also each had a yield strength of at least 420 N / mm 2 and a notched impact strength of at least 280 J / cm 2 at room temperature .
  • FIG. 5 and 6 show that the crack sensitivity in the presence of hydrogen sulfide is particularly low at copper contents above about 0.02%, so that the proposed steel is particularly suitable for the transport and storage of contaminated liquid gas.
  • the high crack resistance can be explained by the fact that in operation under the influence of hydrogen sulfide and water a weak acid develops.
  • the resulting hydrogen ions migrate into the material and are molecularly separated at the grain boundaries. In conventional steels, this results in pressures which lead to cracking.
  • part of the copper dissolves in the acid.
  • the resulting ions migrate to the material surface through ion exchange and form a molecular protective layer made of copper. This copper layer acts as a barrier against further penetration of the hydrogen and explains the high hydrogen resistance of the steel to be used according to the invention, as can be seen in FIG. 4.

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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)
  • Laminated Bodies (AREA)
  • Catalysts (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

1. Use of a manganese-nickel fine-grain structural steel, containing 0.04 to 0.09% carbon, 1.2 to 1.8% manganese, 0.1 to 0.4% silicon, 0.03 to 0.08% niobium, 0.5 to 1.5% nickel, up to 0.25% aluminium, up to 0.015% sulphur and optionally 0.2 to 0.4% copper, remainder iron including smelt dependent impurities, which is normalized, as material for components which, like pipes and vessels, come into contact with liquefied gas at temperatures down to - 120 degrees C.

Description

Die Erfindung bezieht sich auf einez Mangan-Nickel-Feinkornbaustahl mit 0,04 bis 0,09% Kohlenstoff, 1,2 bis 1,8% Mangan, 0,1 bis 0,4% Silizium, 0,03 bis 0,08 % Niob, bis 0,025% Aluminium, bis 0,015% Schwefel, 0,5 bis 1,5% Nickel und fakultativ 0,2 bis 0,4% Kupfer, Rest Eisen einschließlich erschmelzungsbedingter Verunreinigungen.The invention relates to a manganese-nickel fine-grained structural steel with 0.04 to 0.09% carbon, 1.2 to 1.8% manganese, 0.1 to 0.4% silicon, 0.03 to 0.08% Niobium, up to 0.025% aluminum, up to 0.015% sulfur, 0.5 to 1.5% nickel and optionally 0.2 to 0.4% copper, balance iron including melting-related impurities.

Ein legierter Stahl der vorerwähnten Art ist aus der deutschen Offenlegungsschrift 24 07 338 bekannt; er enthält 0,01 bis 0,10% Kohlenstoff, 0,5 bis 2% Mangan, 0,1 bis 0,9% Silizium, 0,001 bis 0,10% Niob, 0,01 bis 0,3% Aluminium und 1,4 bis 3,5% Nickel. Dieser Stahl besitzt eine gewisse Kaltfestigkeit, wenn er in Abhängigkeit vom Nickelgehalt gesteuert warmgewalzt worden ist. Ein in Abhängigkeit vom jeweiligen Nickelgehalt gesteuertes Warmwalzen erweist sich jedoch in der Praxis als schwierig und insbesondere aufwendig. Hinzu kommt, daß die Kaltzähigkeit dieses Stahls nicht ausreicht, um den Stahl bei Temperaturen zu verwenden, wie sie flüssiges Methan und insbesondere flüssiges Äthylen mit sich bringen.An alloy steel of the aforementioned type is known from German Offenlegungsschrift 24 07 338; it contains 0.01 to 0.10% carbon, 0.5 to 2% manganese, 0.1 to 0.9% silicon, 0.001 to 0.10% niobium, 0.01 to 0.3% aluminum and 1, 4 to 3.5% nickel. This steel has a certain cold strength if it has been hot rolled in a controlled manner depending on the nickel content. However, hot rolling controlled as a function of the respective nickel content proves to be difficult and, in particular, complex in practice. In addition, the cold toughness of this steel is not sufficient to use the steel at temperatures such as that of liquid methane and, in particular, liquid ethylene.

Für den Transport und die Lagerung von Flüssiggasen sind Werkstoffe erforderlich, die bei Temperaturen bis -1960C eine ausreichende Festigkeit und Zähigkeit besitzen. Außerdem müssen diese Werkstoffe schweißbar sein, um ein wirtschaftliches Fertigen von Rohren und Behältern zu ermöglichen.For the transport and storage of liquefied materials are required, to -196 0 C have sufficient strength and toughness at temperatures. In addition, these materials must be weldable in order to enable pipes and containers to be manufactured economically.

Es ist bekannt, daß rostfreie Stähle Betriebstemperaturen bis unter -2700 C gewachsen sind. Träger der Kaltzähigkeit ist dabei insbesondere das Nickel. Der hohe Anteil teurer Legierungsbestandteile, setzt der Verwendung der rostfreien Stähle jedoch Grenzen, die nach preiswerteren legierten Stählen haben suchen lassen. Dies hat zur Entwicklung einer Reihe von Stählen mit etwa 9% Nickel, 0,1% Kohlenstoff, 0,80% Mangan und Q020% Phosphor geführt, die sich durch eine im Vergleich zu den rostfreien Stählen höhere Zugfestigkeit und eine bis etwa-2000C ausreichende Kaltzähigkeit auszeichnen. Voraussetzung für die hohe Kaltzähigkeit ist jedoch ein zweistufiges Normalglühen und Anlassen, das darauf abzielt, einen ausreichenden Austenitanteil in einem ferritischen Grundgefüge einzustellen. Dem liegt die Erkenntnis zugrunde, daß sich die Zähigkeit mit zunehmendem Austenitanteil erhöht.It is known that stainless steels have increased operating temperatures to less than -270 0 C. Nickel is the main carrier of the cold toughness. The high proportion of expensive alloy components, however, places limits on the use of stainless steels, which led to the search for cheaper alloy steels. This has led to the development of a number of steels having about 9% nickel, 0.1% carbon, 0.80% manganese and Q020% phosphorus, which is characterized by a as compared with the stainless steels and a higher tensile strength to about 200 0 C mark sufficient toughness. However, a prerequisite for the high cold toughness is a two-stage normalizing and tempering, which aims to establish a sufficient proportion of austenite in a ferritic structure. This is based on the finding that toughness increases with an increasing proportion of austenite.

Versuche haben in diesem Zusammenhang ergeben, daß sich die Kaltzähigkeit mit abnehmenden Gehalten an Kohlenstoff, Phosphor und Mangan erhöht. Des weiteren zeigte sich, daß eine stufenweise Verringerung des Nickelgehaltes auf 2,1% zu einer zunehmenden Beeinträchtigung der Kaltzähigkeit führt. So verringerten sich beispielsweise die Kerbschlagzähigkeiten normalisierter und angelassener, 8,5 bis 9,5% Nickel enthaltender Stähle von 34 J bei -196°C bei 3,25 bis 3,75% Nickel enthaltenden Stählen auf 20 J bei -100°C und bei 2,1 bis 2,5% Nickel enthaltenden Stählen auf 18 J bei -680C. Stähle mit Nickelgehalten unter 9% gelten demnach als nicht für Tiefsttemperaturen geeignet.Experiments have shown in this connection that the cold toughness increases with decreasing contents of carbon, phosphorus and manganese. Furthermore, it was shown that a gradual reduction in the nickel content to 2.1% leads to an increasing impairment of the cold toughness. For example, the impact strength of normalized and tempered steels containing 8.5 to 9.5% nickel was reduced from 34 J at -196 ° C for 3.25 to 3.75% nickel to 20 J at -100 ° C and for steels containing 2.1 to 2.5% nickel to 18 J at -68 0 C. Steels with nickel contents below 9% are therefore not suitable for extremely low temperatures.

Der Erfindung liegt nun die Aufgabe zugrunde, einen legierteßStahl vorzuschlagen, der sich schweißen läßt, eine hohe Strec-kgrenze bei Raumtemperatur und Kaltzähigkeit sowie Beständigkeit gegen Wasserstoffrisse besitzt und sich demgemäß insbesondere als Werkstoff für geschweißte Teile eignet, die wie Rohre und Behälter dem Transport und der Lagerung von Flüssiggasen auch bei Anwesenheit von Schwefelwasserstoff und Wasser dienen. Insbesondere soll der Stahl gegenüber flüssigem Äthylen beständigund Temperaturen bis -1200C gewachsen sein.The invention is based on the object of proposing an alloy steel that can be welded, a high yield strength at room temperature and cold toughness, and resistance to hydrogen cracks sits and is therefore particularly suitable as a material for welded parts that, like pipes and containers, serve for the transport and storage of liquid gases even in the presence of hydrogen sulfide and water. In particular, the steel is to liquid ethylene beständigund temperatures to -120 0 C grown in.

Die Lösung dieser Aufgabe besteht in einem Stahl der eingangs erwähnten Zusammensetzung.The solution to this problem consists in a steel of the composition mentioned at the beginning.

Der Stahl besitzt bereits im walzharten und angelassenen Zustand trotz seines sehr geringen Nickelgehalts eine hohe Kerbschlagzähigkeit und eine Übergangstemperatur, die eine Verwendung bei Temperaturen bis -70°C erlaubt. Die vollen Werkstoffeigenschaften entwickeln sich jedoch erst dann, wenn der vorgeschlagene Stahl normalgeglüht und gegebenenfalls auch noch angelassen worden ist. Nach einer derartigen Wärmebehandlung besitzt der Stahl eine Raumtemperatur-Streckgrenze von mindestens 420 N/mm2 und eine Übergangstemperatur der Kerbschlagzähigkeit von 51 J/cm2 quer zur Walzrichtung von mindestens -1200C sowie eine Kerbschlagzähigkeit von mindestens 280 J/cm2 bei Raumtemperatur.Even in the hard-rolled and tempered condition, the steel has a high notched impact strength and a transition temperature that allows use at temperatures down to -70 ° C despite its very low nickel content. However, the full material properties only develop when the proposed steel has been normalized and, if necessary, also tempered. After such a heat treatment, the steel has a room temperature yield point of at least 420 N / mm 2 and a transition temperature of the impact strength of 51 J / cm 2 transverse to the rolling direction of at least -120 0 C and a notched impact strength of at least 280 J / cm 2 at room temperature .

Enthält der Stahl 0,2 bis 0,4% Kupfer, dann ist seine Rißbeständigkeit in Anwesenheit von Schwefelwasserstoffspuren besonders hoch. Dem kommt insofern eine erhebliche Bedeutung zu, als Flüssiggase häufig Spuren von Schwefelwasserstoff enthalten, der bei gleichzeitiger Anwesenheit von Wasser korrodierend wirkt und insbesondere zu wasserstoffinduzierten Rissen führt.If the steel contains 0.2 to 0.4% copper, its crack resistance is particularly high in the presence of traces of hydrogen sulfide. This is of considerable importance insofar as liquefied gases often contain traces of hydrogen sulfide, which has a corrosive effect when water is present and leads in particular to hydrogen-induced cracks.

Der geringe Kohlenstoffgehalt des Stahls bedingt einerseits ein gutes Schweißverhalten und fördert andererseits die Kerbschlagzähigkeit. Insgesamt finden die ausgezeichneten Eigenschaften des vorgeschlagenen Stahls ihre Erklärung in dem synergistischen Zusammenwirken von Nickel, Niob und Mangan.The low carbon content of the steel on the one hand requires good welding behavior and promotes on the other hand the notched impact strength. Overall, the excellent properties of the proposed steel are explained in the synergistic interaction of nickel, niobium and manganese.

Der Stahl wird vorzugsweise solange normalgeglüht, bis die Kerntemperatur 30 bis 50°C über dem AC3-Punkt liegt und anschließend je 2 Millimeter Materialdicke zwei bis vier Minuten bei 550 bis 650°C, insbesondere bei 6300C angelassen, um die Kaltzähigkeit einzustellen.The steel is preferably annealed until the core temperature is 30 to 50 ° C above the AC 3 point and then annealed for 2 to 4 minutes at 550 to 650 ° C, in particular at 630 0 C, for 2 millimeters of material thickness in order to adjust the cold toughness .

Die Erfindung wird nachfolgend anhand von in der Zeichnung dargestellten Diagrammen und von Ausführungsbeispielen des näheren erläutert. In der Zeichnung zeigen:

  • Bild 1 die Abhängigkeit der Raumtemperatur-Kerbschlagzähigkeit vom Nickelgehalt und der Art der Wärmebehandlung.
  • Bild 2 die Abhängigkeit der Übergangstemperatur vom Nickelgehalt und der Wärmebehandlung.
  • Bild 3 Die Abhängigkeit der Kerbschlagzähigkeit und des Verformungsbruchs eines unter die Erfindung fallenden Stahls im Vergleich zu bekannten Stählen von der Prüftemperatur.
  • Bild 4 den Gehalt an gelöstem Wasserstoff in Abhängigkeit vom Kupfergehalt nach einem 96-stündigem Tauchen in ein mit Schwefelwasserstoff gesättigtes Seewasser und
  • Bild 5 die Länge der wasserstoffinduzierten Risse in Abhängigkeit vom Wasserstoffgehalt.
The invention is explained below with reference to diagrams shown in the drawing and exemplary embodiments. The drawing shows:
  • Figure 1 shows the dependency of the room temperature impact strength on the nickel content and the type of heat treatment.
  • Figure 2 shows the dependence of the transition temperature on the nickel content and the heat treatment.
  • Figure 3 The dependence of the notched impact strength and the deformation fracture of a steel covered by the invention compared to known steels on the test temperature.
  • Figure 4 shows the content of dissolved hydrogen as a function of the copper content after a 96-hour immersion in sea water saturated with hydrogen sulfide and
  • Figure 5 shows the length of the hydrogen-induced cracks depending on the hydrogen content.

Die den Diagrammen der Bilder 1 und 2 zugrundeliegenden Versuche wurden an dem Stahl 1 bis 5 der aus der nachfolgenden Tabelle ersichtlichen Zusammensetzung durchgeführt. Von den angegebenen fallen die Stähle 2 und 3 unter die Erfindung.

Figure imgb0001
The tests on which the diagrams in Figures 1 and 2 are based were carried out on steel 1 to 5 with the composition shown in the table below. Of the specified, steels 2 and 3 fall under the invention.
Figure imgb0001

Proben der Versuchsstähle wurden den aus den Diagrammen ersichtlichen Wärmebehandlungen unterworfen sowie hinsichtlich ihrer Kerbschlagzähigkeit und Kaltzähigkeit untersucht. Die Ergebnisse sind aus den Diagrammen der Bilder 1 und 2 ersichtlich und zeigen, daß sowohl die Kerbschlagzähigkeit bei Raumtemperatur als auch die Übergangstemperatur im Bereich von 0,5 bis 1,5% Nickel unabhängig von der jeweiligen Wärmebehandlung ein Optimum durchlaufen, ohne daß es dazu besonderer Maßnahmen bedarf. Das ist insofern überraschend, als nach herkömmlicher Auffassung ein abnehmender Nickelgehalt mit einer Verringerung der Kalt- und Kerbschlagzähigkeit einhergeht, sofern nicht besondere Maßnahmen wie ein gesteuertes Warmwalzen angewandt werden, um die Kaltzähigkeit einzustellen.Samples of the test steels were subjected to the heat treatments shown in the diagrams and examined with regard to their impact strength and cold toughness. The results can be seen from the diagrams in Figures 1 and 2 and show that both the notched impact strength at room temperature and the transition temperature in the range from 0.5 to 1.5% nickel go through an optimum regardless of the respective heat treatment, without this special measures are required. This is surprising in that, according to the conventional view, a decreasing nickel content is accompanied by a reduction in the cold and notched impact strength, unless special measures such as controlled hot rolling are used to adjust the cold toughness.

Aus den Diagrammen des Bildes 3 ergibt sich die Überlegenheit des erfindungsgemäß zu verwendenden Stahls im Vergleich zu herkömmlichen Normstählen, wobei zu beachten ist, daß es sich hei dem .erfindungsgemäß zu verwendenden Stahl um Querproben, in den anderen Fällen, mit einer Ausnahme, um Längsproben handelt.The diagrams in Figure 3 show the superiority of the steel to be used according to the invention compared to conventional standard steels, whereby it should be noted that the steel to be used according to the invention is a transverse sample, in the other cases, with one exception, a longitudinal sample acts.

Die untersuchten Stähle besaßen zudem jeweils bei Raumtemperatur eine Streckgrenze von mindestens 420 N/mm2 und eine Kerbschlagzähigkeit von mindestens 280 J/cm 2 . The steels examined also each had a yield strength of at least 420 N / mm 2 and a notched impact strength of at least 280 J / cm 2 at room temperature .

Des weiteren zeigen die Diagramme der Bilder 5 und 6, daß die Rißempfindlichkeit in Anwesenheit von Schwefelwasserstoff bei Kupfergehalten über etwa 0,02% besonders gering ist, so daß sich der vorgeschlagene Stahl insbesondere auch zum Transport und zur Lagerung von verunreinigtem Flüssiggas eignet. Die hohe Rißbeständigkeit erklärt sich daraus, daß im Betrieb unter dem Einfluß von Schwefelwasserstoff und Wasser eine schwache Säure entsteht. Die dabei entstehenden Wasserstoffionen wandern in den Werkstoff und scheiden sich molekular an den Korngrenzen ab. Daraus resultieren bei herkömmlichen Stählen zu einer Rißbildung führende Drücke. Bei dem erfindungsgemäß zu verwendenden Stahl löst sich hingegen ein Teil des Kupfers in der Säure. Die dabei entstehenden Ionen wandern durch Ionenaustausch an die Werkstoffoberfläche und bilden dort eine molekulare Schutzschicht aus Kupfer. Diese Kupferschicht wirkt als Sperrschicht gegen ein weiteres Eindringen des Wasserstoffs und erklärt die aus Bild 4 ersichtliche hohe Wasserstoffbeständigkeit des erfindungsgemäß zu verwendenden Stahls.Furthermore, the diagrams in Figures 5 and 6 show that the crack sensitivity in the presence of hydrogen sulfide is particularly low at copper contents above about 0.02%, so that the proposed steel is particularly suitable for the transport and storage of contaminated liquid gas. The high crack resistance can be explained by the fact that in operation under the influence of hydrogen sulfide and water a weak acid develops. The resulting hydrogen ions migrate into the material and are molecularly separated at the grain boundaries. In conventional steels, this results in pressures which lead to cracking. In the steel to be used according to the invention, however, part of the copper dissolves in the acid. The resulting ions migrate to the material surface through ion exchange and form a molecular protective layer made of copper. This copper layer acts as a barrier against further penetration of the hydrogen and explains the high hydrogen resistance of the steel to be used according to the invention, as can be seen in FIG. 4.

Claims (6)

1. Mangan-Nickel Feinkornbaustahl mit 0,04 bis 0,09% Kohlenstoff, 1,2 bis 1,8% Mangan, 0,1 bis 0,4% Silizium, 0,03 bis 0,08% Niob, 0,5 bis 1,5% Nickel, bis 0,25% Aluminium, bis 0,015% Schwefel und fakultativ 0,2 bis 0,4% Kupfer, Rest Eisen, einschließlich erschmelzungsbedingter Verunreinigungen.1.Manganese-nickel fine-grain structural steel with 0.04 to 0.09% carbon, 1.2 to 1.8% manganese, 0.1 to 0.4% silicon, 0.03 to 0.08% niobium, 0.5 up to 1.5% nickel, up to 0.25% aluminum, up to 0.015% sulfur and optionally 0.2 to 0.4% copper, balance iron, including impurities due to melting. 2. Stahl nach Anspruch 1, der jedoch angelassen worden ist.2. Steel according to claim 1, but which has been tempered. 3.Stahl nach Anspruch 2, der jedoch zwei bis vier Minuten je mm Materialdicke bei 550 bis 650°C angelassen worden ist.3. Steel according to claim 2, but which has been tempered for two to four minutes per mm of material thickness at 550 to 650 ° C. 4. Stahl nach Anspruch 2 oder 3, der jedoch normalgeglüht worden ist.4. Steel according to claim 2 or 3, but which has been normalized. 5. Stahl nach Anspruch 4, der jedoch zwei bis vier Minuten bei einer Kerntemperatur von 30 bis 50°C über dem AC3-Punkt normalgeglüht worden ist.5. Steel according to claim 4, but which has been normalized for two to four minutes at a core temperature of 30 to 50 ° C above the AC 3 point. 6. Verwendung eines Stahl nach einem oder mehreren der Ansprüche 1 bis 5 als Werkstoff für Teile, die wie Rohre und Behälter mit Flüssiggas bei Temperaturen bis -120°C in Berührung kommen.6. Use of a steel according to one or more of claims 1 to 5 as a material for parts, such as pipes and containers with liquid gas at temperatures down to -120 ° C in contact.
EP79104222A 1978-11-02 1979-10-31 Use of manganese and nickel-containing fine-grained structural steel Expired EP0010755B2 (en)

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AT79104222T ATE4228T1 (en) 1978-11-02 1979-10-31 USE OF MANGANESE NICKEL FINE GRAIN STEEL.

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DE2847506A DE2847506C2 (en) 1978-11-02 1978-11-02 Use of a low-temperature manganese-nickel fine-grain structural steel
DE2847506 1978-11-02

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EP0010755A1 true EP0010755A1 (en) 1980-05-14
EP0010755B1 EP0010755B1 (en) 1983-07-20
EP0010755B2 EP0010755B2 (en) 1986-08-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262281A1 (en) * 1986-09-25 1988-04-06 MANNESMANN Aktiengesellschaft Process for the production of tubes for use at temperatures up to minus 40 degrees Celsius
FR2633208A1 (en) * 1988-06-22 1989-12-29 Vizi Gyorgy ANGLE ELEMENT FOR CONTAINERS

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB974028A (en) * 1963-02-13 1964-11-04 South Durham Steel & Iron Comp Improvements in and relating to low alloy steels
DE2157305A1 (en) * 1970-11-18 1972-06-29 Nippon Kokan Kk Low alloy steel with high tensile strength
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GB974028A (en) * 1963-02-13 1964-11-04 South Durham Steel & Iron Comp Improvements in and relating to low alloy steels
DE2039910B2 (en) * 1970-08-11 1973-08-02 Nippon Steel Corp , Tokio HEAT TREATMENT PROCESS FOR A STEEL
DE2157305A1 (en) * 1970-11-18 1972-06-29 Nippon Kokan Kk Low alloy steel with high tensile strength
DE2323738A1 (en) * 1972-05-12 1973-11-22 Algoma Steel Corp Ltd PROCESS FOR MANUFACTURING HIGH STRENGTH, NOTCHED STEEL
US3834949A (en) * 1973-02-14 1974-09-10 Inland Steel Co Hot rolled flat steel article for cryogenic service and method for producing same
DE2407338A1 (en) * 1973-02-15 1974-09-05 Nippon Kokan Kk ROLLED, LOW-ALLOY, HIGH TENSION STEEL
DE2411120A1 (en) * 1973-03-16 1974-09-19 Int Nickel Ltd WELDABLE STEEL WITH HIGH STRENGTH
DE2461087A1 (en) * 1973-12-28 1975-07-03 Sumitomo Metal Ind HYDROGEN RESISTANT STEEL FOR PIPING PIPES
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FR2633208A1 (en) * 1988-06-22 1989-12-29 Vizi Gyorgy ANGLE ELEMENT FOR CONTAINERS
BE1004321A4 (en) * 1988-06-22 1992-11-03 Vizi Gyoergy Corner element for containers.

Also Published As

Publication number Publication date
DE2847506C2 (en) 1986-04-17
EP0010755B2 (en) 1986-08-06
EP0010755B1 (en) 1983-07-20
DE2847506A1 (en) 1980-05-14
CA1149647A (en) 1983-07-12
NO151506C (en) 1985-04-24
ATE4228T1 (en) 1983-08-15
NO793516L (en) 1980-05-05
NO151506B (en) 1985-01-07

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