EP1052296A2 - Armour plate and process for its manufacture - Google Patents

Armour plate and process for its manufacture Download PDF

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Publication number
EP1052296A2
EP1052296A2 EP00109687A EP00109687A EP1052296A2 EP 1052296 A2 EP1052296 A2 EP 1052296A2 EP 00109687 A EP00109687 A EP 00109687A EP 00109687 A EP00109687 A EP 00109687A EP 1052296 A2 EP1052296 A2 EP 1052296A2
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EP
European Patent Office
Prior art keywords
armor plate
steel alloy
quenching
hot
steel
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Application number
EP00109687A
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German (de)
French (fr)
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EP1052296A3 (en
EP1052296B1 (en
Inventor
Christoph Kuntze
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Stahl AG
ThyssenKrupp AG
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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 a hot-rolled armored sheet with a tempering structure with a yield strength> 1100 N / mm 2 and a hardness> 400 HB from a low-alloy steel and a method for its production.
  • 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 is set which is as little as possible below the starting hardness.
  • These well-known armor plates are characterized by a homogeneous structure as well as high hardness and bullet resistance even in the case of large thicknesses. 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 a armor plate to propose which, on the one hand, with regard to the Bullet resistance at least equally good properties like armored sheets of the type explained above on the other hand, however, improved material properties, like a higher yield strength, a higher strength at the same time higher toughness and an improved Has weldability.
  • a hot-rolled and tempered armor plate made of a steel alloy which has the following chemical composition (in% by mass):
  • 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 new steel alloy stands out from the Known steel alloy explained at the beginning on the one hand through a lower carbon content and secondly by the carbonitride former vanadium as precipitation-hardening element. Surprisingly achieved one from the steel alloy according to the invention produced armored sheet in the tempered condition despite the lower carbon content compared to known Armor plates have a significantly higher yield strength and Strength, but also a higher toughness and one higher elongation at break.
  • 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 plate according to the invention preferably has a predominantly martenistic structure with a fine Grit. Result in particularly good material properties itself when the proportion of the martensitic structure is at least 98%.
  • room temperature i.e. to a 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 preferably for the rapid cooling Pressurized water is used.
  • 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 Compensation 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 Properties obtained from armored sheet metal are in Table 2 compiled.
  • the yield strength and tensile strength are well 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.

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 ein warmgewalztes Panzerblech mit Vergütungsgefüge mit einer Streckgrenze > 1100 N/mm2 und einer Härte > 400 HB aus einem niedrig legierten Stahl und ein Verfahren zu seiner Herstellung.The invention relates to a hot-rolled armored sheet with a tempering structure with a yield strength> 1100 N / mm 2 and a hardness> 400 HB from a low-alloy steel and a method for its production.

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 with 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 is set which is as little as possible below the starting hardness. These well-known armor plates are characterized by a homogeneous structure as well as high hardness and bullet resistance even in the case of large thicknesses. 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.

Der Erfindung liegt die Aufgabe zugrunde, ein Panzerblech vorzuschlagen, welches 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 a armor plate to propose which, on the one hand, with regard to the Bullet resistance at least equally good properties like armored sheets of the type explained above on the other hand, however, improved material properties, like a higher yield strength, a higher strength at the same time higher toughness and an improved Has weldability.

Zur Lösung dieser Aufgabe wird gemäß der Erfindung ein warmgewalztes und vergütetes Panzerblech aus einer Stahllegierung vorgeschlagen, das folgende chemische Zusammensetzung (in Masse-%) aufweist:

Figure 00020001
Figure 00030001
To achieve this object, a hot-rolled and tempered armor plate made of a steel alloy is proposed according to the invention, which has the following chemical composition (in% by mass):
Figure 00020001
Figure 00030001

Innerhalb des erfindungsgemäßen Zusammensetzungsbereichs wird eine Stahllegierung folgender Zusammensetzung (in Massse-%) bevorzugt:

Figure 00030002
Within the composition range according to the invention, a steel alloy of the following composition (in mass%) is preferred:
Figure 00030002

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 neue 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 new steel alloy stands out from the Known steel alloy explained at the beginning on the one hand through a lower carbon content and secondly by the carbonitride former vanadium as precipitation-hardening element. Surprisingly achieved one from the steel alloy according to the invention produced armored sheet in the tempered condition despite the lower carbon content compared to known Armor plates have a significantly higher yield strength and Strength, but also a higher toughness and one higher elongation at break.

Durch die verbesserte Zähigkeit in Kombination mit der verbesserten Bruchdehnung kann ein aus erfindungsgemäß zusammengesetztem 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 erfindungsgemäßem 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 composite steel produced armor plate shock like mine explosions without the Take up the risk of breaking or cracking. Also the Security 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 Armor sheet according to the invention compared to the prior art Technology significantly 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%.

Erfindungsgemäßes 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 plate according to the invention preferably has a predominantly martenistic structure with a fine Grit. Result in particularly good material properties itself when the proportion of the 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 a 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 preferably for the rapid cooling Pressurized water is used. By an according to the invention composite, usually in heavy plate thickness executed sheet metal in the course of its remuneration up to its core cooled 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 mentioned 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 Compensation 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 Properties obtained from armored sheet metal 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 well 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 Mon 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 10th 1125 1339 10.9 35,32,28 415 2nd 10th 1166 1386 12.0 39,39,39 420 3rd 40 1124 1345 11.0 28,35,29 412 4th 50 1120 1317 11.7 42,38,34 408

Claims (10)

Warmgewalztes Panzerblech mit Vergütungsgefüge und einer Streckgrenze > 1100 N/mm2 und einer Härte > 400 HB aus einer Stahllegierung mit (in Masse-%)
Figure 00070001
Hot-rolled armored sheet with tempering structure and a yield strength> 1100 N / mm 2 and a hardness> 400 HB made of a steel alloy with (in mass%)
Figure 00070001
 Panzerblech nach Anspruch 1 aus einer Stahllegierung mit (in Masse-%)
Figure 00070002
Figure 00080001
Armor plate according to claim 1 made of a steel alloy with (in mass%)
Figure 00070002
Figure 00080001
 Panzerblech nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Stahllegierung zusätzlich bis 0,0050 % B enthält.Armor plate according to claim 1 or 2, characterized in that the steel alloy additionally contains up to 0.0050% B. Panzerblech nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Stickstoffgehalt der Stahllegierung auf 0,0040 bis 0,0080 % begrenzt ist.Armor plate according to one of claims 1 to 3, characterized in that the nitrogen content of the steel alloy is limited to 0.0040 to 0.0080%. Panzerblech nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß es ein überwiegend martensitisches Gefüge besitzt.Armor plate according to one of the preceding claims, characterized in that it has a predominantly martensitic structure. Panzerblech nach Anspruch 5, dadurch gekennzeichnet, daß der Martensitanteil des Gefüges mindestens 98 % beträgt.Armored sheet according to claim 5, characterized in that the martensite component of the structure is at least 98%. Verfahren zur Herstellung eines Panzerblechs bei dem aus einer Stahllegierung gemäß einem der Ansprüche 1 bis 6 ein Vormaterial erzeugt wird, welches anschließend warmgewalzt wird, dadurch gekennzeichnet, daß nach dem Warmwalzen ein zweifaches Austenitisieren bei 880 bis 980 °C, anschließend ein Abschrecken und abschließend ein Anlassen im Bereich von 150 bis 550 °C erfolgt. Process for the production of an armor plate in which a starting material is produced from a steel alloy according to one of claims 1 to 6, which is then hot-rolled, characterized in that after hot-rolling, a double austenitization at 880 to 980 ° C, then a quenching and finally a Tempering takes place in the range from 150 to 550 ° C. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß der Stahl im Zuge des nach dem zweiten Austenitisieren erfolgenden Abschreckens auf Raumtemperatur abgekühlt wird.Method according to claim 7, characterized in that the steel is cooled to room temperature in the course of the quenching which takes place after the second austenitizing. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß die auf den Blechkern bezogene Abkühlgeschwindigkeit während des Abschreckens im Temperaturbereich von 800 bis 500 °C mindestens 5 K/s beträgt.A method according to claim 7 or 8, characterized in that the cooling rate related to the sheet metal core during quenching is at least 5 K / s in the temperature range from 800 to 500 ° C. Verfahren nach Anspruch 9, dadurch gekennzeichnet, daß die Abschreckung mittels druckbeaufschlagtem Wasser erfolgt.A method according to claim 9, characterized in that the quenching is carried out by means of pressurized water.
EP00109687A 1999-05-08 2000-05-08 Use of a steel for the manufacture of amour plates Expired - Lifetime EP1052296B1 (en)

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EP1321535A2 (en) * 2001-12-19 2003-06-25 Böhler Bleche GmbH Material with high ballistic protection
EP1386978A2 (en) * 2002-08-01 2004-02-04 K.B.P. Kettenwerk Becker-Prünte GmbH High-strength and high-toughness steel
EP1705257A1 (en) * 2005-03-24 2006-09-27 Benteler Automobiltechnik GmbH Armour for vehicle
DE102008010168A1 (en) * 2008-02-20 2009-08-27 Benteler Automobiltechnik Gmbh Armor for a vehicle
DE102008014914A1 (en) * 2007-08-23 2009-09-24 Edag Gmbh & Co. Kgaa Structural element for a vehicle-armor to form e.g. a roof, comprises a ballistic sheet of a steel alloy or layers of different steel alloys or metal
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

Families Citing this family (3)

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DE102007039998B4 (en) 2007-08-23 2014-05-22 Benteler Defense Gmbh & Co. Kg Armor for a vehicle
US10224699B2 (en) 2014-09-17 2019-03-05 Siemens Aktiengesellschaft Bullet-resistant electrical installation
CN111996437B (en) * 2020-07-11 2022-05-31 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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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1321535A3 (en) * 2001-12-19 2003-08-13 Böhler Bleche GmbH Material with high ballistic protection
EP1321535A2 (en) * 2001-12-19 2003-06-25 Böhler Bleche GmbH Material with high ballistic protection
EP1386978A2 (en) * 2002-08-01 2004-02-04 K.B.P. Kettenwerk Becker-Prünte GmbH High-strength and high-toughness steel
EP1386978A3 (en) * 2002-08-01 2005-03-02 K.B.P. Kettenwerk Becker-Prünte GmbH High-strength and high-toughness steel
EP1705257A1 (en) * 2005-03-24 2006-09-27 Benteler Automobiltechnik GmbH Armour for vehicle
US7357060B2 (en) 2005-03-24 2008-04-15 Benteler Automobiltechnik Gmbh Vehicle armor
DE102008014914B4 (en) * 2007-08-23 2013-07-04 Vps Vehicle Protection Systems Gmbh Structural part for a vehicle armor
DE102008014914A1 (en) * 2007-08-23 2009-09-24 Edag Gmbh & Co. Kgaa Structural element for a vehicle-armor to form e.g. a roof, comprises a ballistic sheet of a steel alloy or layers of different steel alloys or metal
DE102008010168A1 (en) * 2008-02-20 2009-08-27 Benteler Automobiltechnik Gmbh Armor for a vehicle
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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DE50008938D1 (en) 2005-01-20
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ES2234476T3 (en) 2005-07-01
EP1052296B1 (en) 2004-12-15
DK1052296T3 (en) 2005-04-11

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