EP1052296B1 - Use of a steel for the manufacture of amour plates - Google Patents

Use of a steel for the manufacture of amour plates Download PDF

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Publication number
EP1052296B1
EP1052296B1 EP00109687A EP00109687A EP1052296B1 EP 1052296 B1 EP1052296 B1 EP 1052296B1 EP 00109687 A EP00109687 A EP 00109687A EP 00109687 A EP00109687 A EP 00109687A EP 1052296 B1 EP1052296 B1 EP 1052296B1
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EP
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Prior art keywords
steel
use according
sheet
microstructure
armor plate
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EP00109687A
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German (de)
French (fr)
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EP1052296A3 (en
EP1052296A2 (en
Inventor
Christoph Kuntze
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Stahl AG
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Priority to DK00109687T priority Critical patent/DK1052296T3/en
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Publication of EP1052296A3 publication Critical patent/EP1052296A3/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/42—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for armour plate
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/78—Combined heat-treatments not provided for above

Definitions

  • the invention relates to the use of a steel for Production of hot-rolled armored sheet.
  • the slabs After heating to a temperature of> 1150 ° C, the slabs, which are preferably produced in a continuous casting process, are hot-rolled into coarse strips or sheets.
  • the armored sheet which was rolled to its final thickness, is hardened after cooling to room temperature by reheating to above Ac 3 and quenching at a rate of> 1 K / s in oil or water.
  • the sheet can then be tempered in the temperature range of 180 to 250 ° C if necessary.
  • a high hardness which is as little as possible below the crack hardness, is set.
  • These well-known armor plates are characterized by a homogeneous structure as well as high hardness and bullet resistance even with a large thickness. The penetration depth of projectiles can usually be reduced by 30%.
  • an armor plate made of steel is included 0.25 - 0.45% C, 0.08 - 0.50% Si, 0.30 - 1.50% Mn, ⁇ 0.02% P, ⁇ 0.02% S, 0.60 - 1.80% Cr, 0.20-0.60% Mo, ⁇ 0.006% B, 0.02-0.15% Al and / or Ti and 0.005 - 0.03% Nb known from CA 1 266 760 C1, which austenitizes at 860 to 960 ° C, then quenched and tempered at 160-550 ° C.
  • the invention has for its object one for Manufacture of steel sheet suitable for armor to propose, the one produced from this steel Armored sheet metal on the one hand with regard to bullet resistance properties at least as good as the armor plates of the on the other hand improved material properties, such as a higher one Yield strength, higher strength at the same time higher toughness and improved weldability having.
  • the invention proposes the use of a (in mass%) 0.15 - 0.2% C 0.1 - 0.5% Si 0.7 - 1.7% Mn ⁇ 0.02% P ⁇ 0.005% S ⁇ 0.01% N 0.009 - 0.1% al 0.5 - 1.0% Cr 0.2 - 0.7% Mo 1.0 - 2.5% Ni 0.05 - 0.25% V Rest of iron including unavoidable impurities, steel for the production of armored sheet, which has a tempering structure and a yield strength> 1100 N / mm 2 , a hardness> 400 HB and a notched impact strength A v of at least 27 joules measured on an ISO-V cross-test at -40 ° C having.
  • a steel alloy of the following composition (in mass%) is preferred within the composition range used according to the invention: 0.16 - 0.18% C 0.2 - 0.4% Si 0.9 - 1.1% Mn ⁇ 0.015% P ⁇ 0.005% S ⁇ 0.008% N 0.015 - 0.05% al 0.6 - 0.8% Cr 0.5 - 0.6% Mo 1.9 - 2.0% Ni 0.06 - 0.1% V Balance Fe including unavoidable impurities.
  • the steel alloy can additionally contain up to 0.005% boron contain.
  • the nitrogen content of the steel alloy should preferably limited to 0.004 to 0.008%.
  • the steel alloy used according to the new use stands out compared to the above known steel alloy on the one hand by a lower carbon content and secondly through the Carbonitride former vanadium as a precipitation hardening agent Element off.
  • the yield strength of the armor plate according to the invention is over 1100 N / mm 2 compared to only 950 N / mm 2 of the known armor plate.
  • the minimum tensile strength is 1200 N / mm 2 , in particular 1250 N / mm 2 , and is consequently significantly higher than the minimum tensile strength of 1150 N / mm 2 achieved in the prior art.
  • the toughness of armor sheets according to the invention measured on an ISO-V transverse sample at -40 ° C., is A v ⁇ 27 joules. Their elongation at break is more than 10%.
  • Armor sheet produced according to the invention preferably a predominantly martenistic structure a fine grain. Particularly good ones Material properties arise when the proportion of martensitic structure is at least 98%.
  • room temperature i.e. to well below the martensite start temperature fine-grained martensitic structure.
  • Whose Fine grain can be further improved in that the quench to room temperature after the second Austenitization in the temperature range of 800 - 500 ° C with one related to the sheet metal core Cooling rate of at least 5 K / s takes place, whereby preferred for the rapid cooling Pressurized water is used.
  • an invention composite usually in heavy plate thickness executed sheet metal in the course of its remuneration up to cooled its core at such high speeds armor sheet is obtained, which has a share in very fine-grained martensite of more than 98%.
  • Such an armor plate has, as already above mentions excellent properties and meets the requirements Sheets of the type in question reliable.
  • a melt of the composition shown in Table 1 was poured into a 260 mm thick slab.
  • the slab was based on a furnace temperature of 1250 ° C, with a piercing temperature of about 1100 ° C at a final rolling temperature of 950 ° C to a final thickness of 10, 40 and 50 mm hot rolled. Then the Aging treatment.
  • sheets 1, 3 and 4 in Table 2 consisted of austenitizing (940 ° C / water) with subsequent tempering 320 ° C / air. Sheet 2 was austenitized twice, quenched and tempered. The samples of the like The properties of the armored sheet obtained are in Table 2 compiled.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Laminated Bodies (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Abstract

A hot rolled armor plate is made of a low carbon, low alloy steel containing carbonitride-forming vanadium as precipitation hardening element. A novel hot rolled armor plate consists of a steel of composition (by wt.) 0.15-0.20% C, 0.10-0.50% Si, 0.70-1.70% Mn, less than 0.02% P, less than 0.005% S, less than 0.01% N, 0.009-0.10% Al, 0.50-1.00% Cr, 0.20-0.70% Mo, 1.00-2.50% Ni, 0.05-0.25% V, balan Fe and impurities. An Independent claim is also included for production of the above armor plate by hot rolling, double austenitizing at 880-980 degrees C, quenching and tempering at 150-550 degrees C.

Description

Die Erfindung betrifft die Verwendung eines Stahls zur Herstellung von warmgewalztem Panzerblech.The invention relates to the use of a steel for Production of hot-rolled armored sheet.

Zur Herstellung von Panzerblechen mit einer Mindesthärte von 400 HB und einer Enddicke über 50 mm aus Stahlbrammen durch Warmwalzen, Härten und Anlassen ist aus der DE 42 23 895 C1 eine Stahllegierung bekannt mit 0,25 bis 0,32 % C, 0,05 bis 0,75 % Si, 0,10 bis 1,50 % Mn, 0,90 bis 2,00 % Cr, 0,10 bis 0,70 % Mo, 1,20 bis 4,50 % Ni, 0,01 bis 0,08 % Al, max. 0,050 % Nb, max. 0,10 % V, max. 0,015 % P, max. 0,005 % S, max. 0,012 % N, Rest Fe einschl. üblicher Verunreinigungen und ggf. 0,001 bis 0,004 % B.For the production of armored sheets with a minimum hardness of 400 HB and a final thickness of over 50 mm from steel slabs by hot rolling, hardening and tempering DE 42 23 895 C1 a steel alloy known from 0.25 to 0.32% C, 0.05 to 0.75% Si, 0.10 to 1.50% Mn, 0.90 up to 2.00% Cr, 0.10 to 0.70% Mo, 1.20 to 4.50% Ni, 0.01 to 0.08% Al, max. 0.050% Nb, max. 0.10% V, Max. 0.015% P, max. 0.005% S, max. 0.012% N, balance Fe including common impurities and possibly 0.001 to 0.004% B.

Nach einem Durcherwärmen auf eine Temperatur von > 1150 °C werden die bevorzugt im Stranggießverfahren erzeugten Brammen zu Grobbändern oder -blechen warmgewalzt. Das auf Enddicke fertiggewalzte Panzerblech wird nach dem Abkühlen auf Raumtemperatur durch Wiedererwärmen auf oberhalb Ac3 und Abschrecken mit einer Geschwindigkeit von > 1 K/s in Öl oder Wasser gehärtet. Anschließend kann das Blech im Bedarfsfall im Temperaturgebiet von 180 bis 250 °C angelassen werden. Dadurch wird eine hohe, möglichst nur wenig unter der Ansprunghärte liegende Härte eingestellt. Diese bekannten Panzerbleche zeichnen sich auch bei großer Dicke durch ein homogenes Gefüge sowie hohe Härte und Beschußfestigkeit aus. Die Eindringtiefe von Geschossen kann in der Regel um 30 % verringert werden. After heating to a temperature of> 1150 ° C, the slabs, which are preferably produced in a continuous casting process, are hot-rolled into coarse strips or sheets. The armored sheet, which was rolled to its final thickness, is hardened after cooling to room temperature by reheating to above Ac 3 and quenching at a rate of> 1 K / s in oil or water. The sheet can then be tempered in the temperature range of 180 to 250 ° C if necessary. As a result, a high hardness, which is as little as possible below the crack hardness, is set. These well-known armor plates are characterized by a homogeneous structure as well as high hardness and bullet resistance even with a large thickness. The penetration depth of projectiles can usually be reduced by 30%.

Weiterhin ist ein Panzerblech aus einem Stahl mit 0,25 - 0,45 % C, 0,08 - 0,50 % Si, 0,30 - 1,50 % Mn, ≤ 0,02 % P, ≤ 0,02 % S, 0, 60 - 1,80 % Cr, 0,20 - 0,60 % Mo, ≤ 0,006 % B, 0,02 - 0,15 % Al und/oder Ti und 0,005 - 0,03 % Nb aus der CA 1 266 760 C1 bekannt, welches bei 860 bis 960 °C austenitisiert, danach abgeschreckt und bei 160 - 550 °C angelassen wird.Furthermore, an armor plate made of steel is included 0.25 - 0.45% C, 0.08 - 0.50% Si, 0.30 - 1.50% Mn, ≤ 0.02% P, ≤ 0.02% S, 0.60 - 1.80% Cr, 0.20-0.60% Mo, ≤ 0.006% B, 0.02-0.15% Al and / or Ti and 0.005 - 0.03% Nb known from CA 1 266 760 C1, which austenitizes at 860 to 960 ° C, then quenched and tempered at 160-550 ° C.

Neben dem voranstehend erläuterten Stand der Technik ist aus dem von Dr.-Ing. B. Müsgen verfassten Artikel "Hochfeste wasservergütete Feinkornbaustähle mit Mindeststreckgrenzen bis 90 kp/mm2", erschienen in DECHEMA MONOGRAPHIEN, Verlag Chemie, Weinheim, Bd. 76, 1974, ein hochfester wasservergüteter Baustahl bekannt, der aus Eisen, unvermeidbaren Verunreinigungen und Gehalten an Mo (in Gew.-%) 0,19 % C, 0,30 % Si, 0,65 % Mn, 0,60 % Cr, 2,00 % Ni, 0,09 % V besteht. Bei einem Mo-Gehalt von mindestens 0,35 % Mo und Beachtung einer geeigneten Anlasstemperatur erreicht der bekannte Stahl eine Zugfestigkeit von mindestens 1.100 N/mm2. Die Härte des bekannten Stahls ist jedoch geringer als für Panzerbleche üblicherweise gefordert.In addition to the state of the art explained above, Dr.-Ing. B. Müsgen wrote article "High-strength water-tempered fine-grained structural steels with minimum yield strengths up to 90 kp / mm 2 ", published in DECHEMA MONOGRAPHIEN, Verlag Chemie, Weinheim, Vol. 76, 1974, a high-strength water-tempered structural steel known from iron, inevitable impurities and contents Mo (in% by weight) 0.19% C, 0.30% Si, 0.65% Mn, 0.60% Cr, 2.00% Ni, 0.09% V. With a Mo content of at least 0.35% Mo and observing a suitable tempering temperature, the known steel achieves a tensile strength of at least 1,100 N / mm 2 . However, the hardness of the known steel is lower than is usually required for armored sheets.

Der Erfindung liegt die Aufgabe zugrunde, einen für die Herstellung von Panzerblechen geeigneten Stahl vorzuschlagen, wobei das aus diesem Stahl erzeugte Panzerblech einerseits hinsichtlich der Durchschußhemmung mindestens gleich gute Eigenschaften wie Panzerbleche der voranstehend erläuterten Art andererseits jedoch verbesserte Werkstoffeigenschaften, wie eine höhere Streckgrenze, eine höhere Festigkeit bei gleichzeitig höherer Zähigkeit und eine verbesserte Schweißbarkeit aufweist. The invention has for its object one for Manufacture of steel sheet suitable for armor to propose, the one produced from this steel Armored sheet metal on the one hand with regard to bullet resistance properties at least as good as the armor plates of the on the other hand improved material properties, such as a higher one Yield strength, higher strength at the same time higher toughness and improved weldability having.

Zur Lösung dieser Aufgabe schlägt die Erfindung die Verwendung eines (in Masse-%) 0,15 - 0,2 % C 0,1 - 0,5 % Si 0,7 - 1,7 % Mn < 0,02 % P < 0,005% S < 0,01 % N 0,009 - 0,1 % Al 0,5 - 1,0 % Cr 0,2 - 0,7 % Mo 1,0 - 2,5 % Ni 0,05 - 0,25 % V Rest Eisen einschl. unvermeidbarer Verunreinigungen,
aufweisenden Stahls für die Herstellung von Panzerblech vor, welcher ein Vergütungsgefüge besitzt und eine Streckgrenze > 1100 N/mm2, eine Härte > 400 HB und eine an einer ISO-V-Querprobe bei -40 °C gemessene Kerbschlagzähigkeit Av von mindestens 27 Joule aufweist.To achieve this object, the invention proposes the use of a (in mass%) 0.15 - 0.2% C 0.1 - 0.5% Si 0.7 - 1.7% Mn <0.02% P <0.005% S <0.01% N 0.009 - 0.1% al 0.5 - 1.0% Cr 0.2 - 0.7% Mo 1.0 - 2.5% Ni 0.05 - 0.25% V Rest of iron including unavoidable impurities,
steel for the production of armored sheet, which has a tempering structure and a yield strength> 1100 N / mm 2 , a hardness> 400 HB and a notched impact strength A v of at least 27 joules measured on an ISO-V cross-test at -40 ° C having.

Innerhalb des erfindungsgemäß verwendeten Zusammensetzungsbereichs wird eine Stahllegierung folgender Zusammensetzung (in Massse-%) bevorzugt: 0,16 - 0,18 % C 0,2 - 0,4 % Si 0,9 - 1,1 % Mn < 0,015 % P < 0,005 % S < 0,008 % N 0,015 - 0,05 % Al 0,6 - 0,8 % Cr 0,5 - 0,6 % Mo 1,9 - 2,0 % Ni 0,06 - 0,1 % V Rest Fe einschl. unvermeidbarer Verunreinigungen.A steel alloy of the following composition (in mass%) is preferred within the composition range used according to the invention: 0.16 - 0.18% C 0.2 - 0.4% Si 0.9 - 1.1% Mn <0.015% P <0.005% S <0.008% N 0.015 - 0.05% al 0.6 - 0.8% Cr 0.5 - 0.6% Mo 1.9 - 2.0% Ni 0.06 - 0.1% V Balance Fe including unavoidable impurities.

Die Stahllegierung kann zusätzlich bis 0,005 % Bor enthalten. Der Stickstoffgehalt der Stahllegierung soll bevorzugt auf 0,004 bis 0,008 % begrenzt sein.The steel alloy can additionally contain up to 0.005% boron contain. The nitrogen content of the steel alloy should preferably limited to 0.004 to 0.008%.

Die gemäß der neuen Verwendung eingesetzte Stahllegierung zeichnet sich gegenüber den eingangs erläuterten bekannten Stahllegierung zum einen durch einen niedrigeren Kohlenstoffgehalt und zum anderen durch den Karbonitridbildner Vanadium als ausscheidungshärtendes Element aus. Überraschenderweise erreicht ein aus der erfindungsgemäßen Stahllegierung erzeugtes Panzerblech im vergüteten Zustand trotz des niedrigeren Kohlenstoffgehaltes gegenüber bekannten Panzerblechen eine deutlich höhere Streckgrenze und Festigkeit, aber auch eine höhere Zähigkeit und eine höhere Bruchdehnung.The steel alloy used according to the new use stands out compared to the above known steel alloy on the one hand by a lower carbon content and secondly through the Carbonitride former vanadium as a precipitation hardening agent Element off. Surprisingly, one reaches out of the Armor sheet produced according to the invention in the tempered condition despite the lower Carbon content compared to known armor plates a significantly higher yield strength and strength, however also a higher toughness and a higher elongation at break.

Durch die verbesserte Zähigkeit in Kombination mit der verbesserten Bruchdehnung kann ein aus erfindungsgemäß verwendetem Stahl erzeugtes Panzerblech die schockartige Beanspruchung bei Minenexplosionen ohne die Gefahr einer Bruch- oder Rißbildung aufnehmen. Auch die Sicherheit gegen die Entstehung von Sprüngen und gegen die Ausbildung von Rissen oder Abplatzungen bei direktem Beschuß ist bei erfindungsgemäßem Stahl gegenüber herkömmlichen Stählen der gattungsgemäßen Art verbessert. Daher sind die Gebrauchseigenschaften von erfindungsgemäß erzeugtem Panzerblech gegenüber dem Stand der Technik deutlich verbessert. Due to the improved toughness in combination with the Improved elongation at break can be made according to the invention Armored sheet steel used the shock-like Exposure to mine explosions without the risk of Record breakage or cracking. Security too against the occurrence of jumps and against the Formation of cracks or flaking in direct Shelling is compared to steel according to the invention conventional steels of the generic type improved. Therefore, the performance characteristics of are according to the invention produced armor sheet compared to the prior art clearly improved.

Die Streckgrenze des erfindungsgemäßen Panzerblechs liegt über 1100 N/mm2 gegenüber nur 950 N/mm2 des bekannten Panzerblechs. Die Mindestzugfestigkeit beträgt 1200 N/mm2, insbesondere 1250 N/mm2, und ist folglich deutlich höher als die beim Stand der Technik errreichte Mindestzugfestigtkeit von 1150 N/mm2. Die Zähigkeit erfindungsgemäßer Panzerbleche gemessen an einer ISO-V-Querprobe bei -40 °C liegt bei Av ≥ 27 Joule. Ihre Bruchdehnung liegt bei mehr als 10 %.The yield strength of the armor plate according to the invention is over 1100 N / mm 2 compared to only 950 N / mm 2 of the known armor plate. The minimum tensile strength is 1200 N / mm 2 , in particular 1250 N / mm 2 , and is consequently significantly higher than the minimum tensile strength of 1150 N / mm 2 achieved in the prior art. The toughness of armor sheets according to the invention, measured on an ISO-V transverse sample at -40 ° C., is A v ≥ 27 joules. Their elongation at break is more than 10%.

Erfindungsgemäß erzeugtes Panzerblech besitzt vorzugsweise ein überwiegend martenistisches Gefüge mit einer feinen Körnung. Besonders gute Materialeigenschaften ergeben sich, wenn der Anteil des martensitischen Gefüges mindestens 98 % beträgt.Armor sheet produced according to the invention preferably a predominantly martenistic structure a fine grain. Particularly good ones Material properties arise when the proportion of martensitic structure is at least 98%.

Bei der Vergütungsbehandlung des Panzerblechs wird eine zweifache Austenitisierung im Temperaturbereich von 880 bis 980 °C mit Luftabkühlung zwischen den Austenitisierungsvorgängen, Abschrecken nach der zweiten Austenitisierung auf Raumtemperatur und ein abschließendes Anlassen bei 150 bis 550 °C bevorzugt. Durch die Abschreckung bis zur Raumtemperatur, d.h. bis deutlich unterhalb der Martensitstarttemperatur, wird ein feinkörniges martensitisches Gefüge erzeugt. Dessen Feinkörnigkeit kann dadurch noch verbessert werden, daß die Abschreckung auf Raumtemperatur nach der zweiten Austenitisierung im Temperaturbereich von 800 - 500 °C mit einer auf den Blechkern bezogenen Abkühlgeschwindigkeit vom mindestens 5 K/s erfolgt, wobei für die derart schnelle Abkühlung vorzugsweise Druckwasser eingesetzt wird. Indem ein erfindungsgemäß zusammengesetztes, in der Regel in Grobblechdicke ausgeführtes Blech im Zuge seiner Vergütung bis hinein in seinen Kern mit derart hohen Geschwindigkeiten abgekühlt wird, wird ein Panzerblech erhalten, das einen Anteil an sehr feinkörnigem Martensit von mehr als 98 % besitzt. Ein solches Panzerblech hat, wie voranstehend schon erwähnt, hervorragende Eigenschaften und erfüllt die an Bleche der in Rede stehenden Art gestellten Anforderungen zuverlässig.When the armored sheet is treated, a double austenitization in the temperature range of 880 up to 980 ° C with air cooling between the Austenitization processes, quenching after the second Austenitization to room temperature and on final tempering at 150 to 550 ° C preferred. By quenching to room temperature, i.e. to well below the martensite start temperature fine-grained martensitic structure. Whose Fine grain can be further improved in that the quench to room temperature after the second Austenitization in the temperature range of 800 - 500 ° C with one related to the sheet metal core Cooling rate of at least 5 K / s takes place, whereby preferred for the rapid cooling Pressurized water is used. By an invention composite, usually in heavy plate thickness executed sheet metal in the course of its remuneration up to cooled its core at such high speeds armor sheet is obtained, which has a share in very fine-grained martensite of more than 98%. Such an armor plate has, as already above mentions excellent properties and meets the requirements Sheets of the type in question reliable.

Beispiel:Example:

Eine Schmelze der Zusammensetzung gemäß Tabelle 1 wurde zu einer 260 mm dicken Bramme abgegossen. Die Bramme wurde, ausgehend von einer Stoßofentemperatur von 1250 °C, mit einer Anstichtemperatur von etwa 1100 °C bei einer Endwalztemperatur von 950 °C auf Enddicken von 10, 40 und 50 mm warmgewalzt. Danach erfolgte die Vergütungsbehandlung. Bei den Blechen 1, 3 und 4 in Tabelle 2 bestand diese aus Austenitisieren (940 °C / Wasser) mit nachfolgendem Anlassen auf 320 °C/Luft. Das Blech 2 wurde zweifach austenitisiert, abgeschreckt und angelassen. Die an Proben der so gewonnenen Panzerbleche ermittelten Eigenschaften sind in der Tabelle 2 zusammengestellt.A melt of the composition shown in Table 1 was poured into a 260 mm thick slab. The slab was based on a furnace temperature of 1250 ° C, with a piercing temperature of about 1100 ° C at a final rolling temperature of 950 ° C to a final thickness of 10, 40 and 50 mm hot rolled. Then the Aging treatment. For sheets 1, 3 and 4 in Table 2 consisted of austenitizing (940 ° C / water) with subsequent tempering 320 ° C / air. Sheet 2 was austenitized twice, quenched and tempered. The samples of the like The properties of the armored sheet obtained are in Table 2 compiled.

Die Streckgrenze und Zugfestigkeit liegt deutlich oberhalb der vorgenannten Mindestgrenzwerte. Die Dehnwerte sind mit rd. 11 bis 12 % außerordentlich gut, und die Kerbschlagzähigkeitswerte liegen ebenfalls deutlich über der vorgenannten Mindestgrenze von 27 J. Die Härtewerte liegen alle oberhalb 400 HB. Das zweifach austenitisierte Blech 2 erzielte nochmals erhöhte Werte der mechanischen Eigenschaften. C Si Mn P S Al Cr Mo Ni V 0,16 0,29 0,98 0,012 0,003 0,025 0,66 0,51 1,93 0,07 Blech Nr. Dicke (mm) Re (N/mm2) Rm (N/mm2) A (%) ISO-V-quer -40°C Härte HB10/3000 1 10 1125 1339 10,9 35,32,28 415 2 10 1166 1386 12,0 39,39,39 420 3 40 1124 1345 11,0 28,35,29 412 4 50 1120 1317 11,7 42,38,34 408 The yield strength and tensile strength are clearly above the aforementioned minimum limits. The elongation values are approx. 11 to 12% is extraordinarily good, and the notched impact strength values are also significantly above the aforementioned minimum limit of 27 J. The hardness values are all above 400 HB. The double austenitized sheet 2 again achieved increased values of the mechanical properties. C Si Mn P S al Cr Mo Ni V 0.16 0.29 0.98 0,012 0,003 0,025 0.66 0.51 1.93 0.07 Sheet no. Thickness (mm) Re (N / mm 2 ) Rm (N / mm 2 ) A (%) ISO-V cross -40 ° C Hardness HB10 / 3000 1 10 1125 1339 10.9 35,32,28 415 2 10 1166 1386 12.0 39,39,39 420 3 40 1124 1345 11.0 28,35,29 412 4 50 1120 1317 11.7 42,38,34 408

Claims (5)

  1. Use of a steel containing (in wt %) 0.15 to 0.20 % C 0.10 to 0.50 % Si 0.70 to 1.70 % Mn < 0.02 % P < 0.005 % S < 0.01 % N 0.009 to 0.10 % Al 0.50 to 1.00 % Cr 0.20 to 0.70 % Mo 1.00 to 2.50 % Ni 0.05 to 0.25 % V, up to 0.0050 % B,
    a balance iron including unavoidable impurities for the production of armour plate, which has a heat-treatable microstructure, yield point > 1100 N/mm2, hardness > 400 HB and notched-bar impact-strength measured on an ISO V transverse test piece at -40 °C of at least 27 Joules.
  2. Use according to Claim 1, characterised in that the steel alloy contains (in wt %) 0.16 to 0.18 % C 0.20 to 0.40 % Si 0.90 to 1.10 % Mn < 0.015 % P < 0.005 % S < 0.008 % N 0.015 to 0.050 % Al 0.60 to 0.80 % Cr 0.50 to 0.60 % Mo 1.90 to 2.00 % Ni 0.06 to 0.10 % V,
    a balance iron including unavoidable impurities.
  3. Use according to any one of the above claims, characterised in that the nitrogen content of the steel alloy is limited to between 0.0040 and 0.0080 %.
  4. Use according to any one of the above claims, characterised in that the armour plate possesses a predominantly martensitic microstructure.
  5. Use according to Claim 4, characterised in that the martensitic percentage of the microstructure amounts to at least 98 %.
EP00109687A 1999-05-08 2000-05-08 Use of a steel for the manufacture of amour plates Expired - Lifetime EP1052296B1 (en)

Priority Applications (1)

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DK00109687T DK1052296T3 (en) 1999-05-08 2000-05-08 Use of a steel for making armor plates

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DE19921327 1999-05-08
DE19921327 1999-05-08

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EP1052296A3 EP1052296A3 (en) 2002-06-26
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1705257A1 (en) 2005-03-24 2006-09-27 Benteler Automobiltechnik GmbH Armour for vehicle
EP2028435A1 (en) 2007-08-23 2009-02-25 Benteler Automobiltechnik GmbH Armour for a vehicle
CN111996437A (en) * 2020-07-11 2020-11-27 江阴兴澄特种钢铁有限公司 Production method of large-thickness high-toughness ultrahigh-strength steel plate with yield strength of 1100MPa
EP3321944B1 (en) 2014-09-17 2022-04-06 Siemens Energy Global GmbH & Co. KG Bombardment-resistant electrical installation

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DE50202536D1 (en) * 2001-12-19 2005-04-28 Boehler Bleche Gmbh Muerzzusch Material with high ballistic protection
DE10235219A1 (en) * 2002-08-01 2004-02-19 K.B.P. Kettenwerk Becker-Prünte Gmbh Steel with high strength and good toughness
DE102008014914B4 (en) * 2007-08-23 2013-07-04 Vps Vehicle Protection Systems Gmbh Structural part for a vehicle armor
DE102008010168B4 (en) * 2008-02-20 2010-04-22 Benteler Automobiltechnik Gmbh Armor for a vehicle
DE102008054078A1 (en) 2008-10-31 2010-05-06 Daimler Ag Armored motor vehicle i.e. car, body, has body frame, body protection elements and mounting parts or fixing parts made of hot working armor steel, where mounting or fixing parts exhibit invariable high heat resistance and warm hardness
DE102012109693B4 (en) * 2012-10-11 2018-06-28 Benteler Defense Gmbh & Co. Kg Use of a steel alloy for the production of a tank component and tank component
CN109750228A (en) * 2019-03-04 2019-05-14 内蒙金属材料研究所 A kind of rare earth hammer strap and preparation method thereof

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JPS61130462A (en) * 1984-11-28 1986-06-18 Tech Res & Dev Inst Of Japan Def Agency High-touchness extra high tension steel having superior stress corrosion cracking resistance as well as yield stress of 110kgf/mm2 and above
JPH0670248B2 (en) * 1988-09-13 1994-09-07 川崎製鉄株式会社 Manufacturing method of ultra-high-strength steel plate for welding with excellent homogeneity in the thickness direction
DE4223895C1 (en) * 1992-07-21 1994-03-17 Thyssen Stahl Ag Process for the production of thick armored sheets
JPH07126739A (en) * 1993-11-09 1995-05-16 Kobe Steel Ltd Production of high toughness and high strength steel plate having >=980n/mm2 class tensile strength and low in residual stress
DE19736720C1 (en) * 1997-08-19 1999-05-06 Mannesmann Ag Metallurgical vessel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1705257A1 (en) 2005-03-24 2006-09-27 Benteler Automobiltechnik GmbH Armour for vehicle
DE102005014298A1 (en) * 2005-03-24 2006-10-05 Benteler Automobiltechnik Gmbh Armor for a vehicle
DE102005014298B4 (en) * 2005-03-24 2006-11-30 Benteler Automobiltechnik Gmbh Armor for a vehicle
EP2028435A1 (en) 2007-08-23 2009-02-25 Benteler Automobiltechnik GmbH Armour for a vehicle
DE102007039998A1 (en) 2007-08-23 2009-02-26 Benteler Automobiltechnik Gmbh Armor for a vehicle
EP3321944B1 (en) 2014-09-17 2022-04-06 Siemens Energy Global GmbH & Co. KG Bombardment-resistant electrical installation
CN111996437A (en) * 2020-07-11 2020-11-27 江阴兴澄特种钢铁有限公司 Production method of large-thickness high-toughness ultrahigh-strength steel plate with yield strength of 1100MPa

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DK1052296T3 (en) 2005-04-11
EP1052296A3 (en) 2002-06-26
ES2234476T3 (en) 2005-07-01
ATE284977T1 (en) 2005-01-15
DE50008938D1 (en) 2005-01-20
EP1052296A2 (en) 2000-11-15

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