EP1008659B1 - Use of a maraging steel as an armour plate - Google Patents

Use of a maraging steel as an armour plate Download PDF

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Publication number
EP1008659B1
EP1008659B1 EP99123069A EP99123069A EP1008659B1 EP 1008659 B1 EP1008659 B1 EP 1008659B1 EP 99123069 A EP99123069 A EP 99123069A EP 99123069 A EP99123069 A EP 99123069A EP 1008659 B1 EP1008659 B1 EP 1008659B1
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EP
European Patent Office
Prior art keywords
sheet
martensite
temperature
maraging steel
nitriding
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EP99123069A
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German (de)
French (fr)
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EP1008659A1 (en
Inventor
Christoph Dr. Dilg
Uwe Hofmann
Claus Dr. Just
Hans-Jürgen Rögele
Helmut Schönberger
Jürgen Vogt
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AG Der Dillinger Huettenwerke
Dillinger Huettenwerke AG
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AG Der Dillinger Huettenwerke
Dillinger Huettenwerke AG
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Classifications

    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/007—Heat treatment of ferrous alloys containing Co
    • 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
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/02—Pretreatment of the material to be coated
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/02—Hardening by precipitation

Abstract

Maraging steel sheet production comprises surface hardening of the maraged sheet at below the martensite to austenite transformation temperature. Production of a sheet of a maraging steel, especially of composition ≤ 0.03% C, ≤ 0.1% Si, ≤ 0.1% Mn, ≤ 0.01% P, ≤ 0.01% S, 0.05-0.15% Al, 17.0-19.0% Ni, 7.0-16.0% Co, 4.0-6.5% Mo, 0.5-2% Ti, optionally one or more of ≤ 0.5% Cr, ≤ 0.5% Cu, ≤ 0.2% Nb, ≤ 0.2% V, ≤ 0.2% Zr and ≤ 0.2% W, balance Fe and impurities, comprises age hardening by heating the sheet, especially after cutting and shaping, to a temperature below the martensite to austenite transformation temperature, the sheet then being additionally surface hardened at below the martensite to austenite transformation temperature. Preferred Features: Surface hardening is carried out by plasma nitriding, hard chromium plating or coating with a hard material.

Description

Die Erfindung befasst sich mit Panzerungsblechen aus martensitaushärtendem Stahl.The invention is concerned with armor plates made of martensitic steel.

Ein solches Panzerungsblech der Zusammensetzung ≤ 0.03% C, ≤ 0,1 % Si, ≤ 0.1% Mn, ≤ 0,01% P, ≤ 0,01% S, 0,05 bis 0.15% Al, 17,0 bis 19,0% Ni, 7,0 bis 16,0% Co, 4,0 bis 6,5% Mo und 0,5 bis 2% Ti, ggf. ferner ≤ 0,5% Cr, ≤ 0,5% Cu, ≤ 0,2% Nb, ≤ 0,2% V, ≤ 0,2% Zr und/oder ≤ 0,2% W, Rest Fe und verfahrensbedingte Verunreinigungen, ist bekannt aus dem Werkstoffblatt "DILLIDUR X" der DILLINGER HÜTTE GTS (Spezifikation DH- D 02- B, Ausgabe 11.1992) sowie durch Benutzung. Es wird in dem Werkstoffblatt angeboten in Blechdicken von 4,5 bis 9,0 mm (inzwischen auf 12,0 mm vergrößert) zum Schutz z.B. von PKWs und Werttransportern gegen Beschuß und Einwirkung von Explosivstoffen. Der Stahl wird, insbesondere nach dem Ausschneiden und ggf. sonstigen Formen des Zuschnitts, durch Erwärmen auf eine Temperatur unter der Umwandlungstemperatur Martensit → Austenit ausgehärtet.Such armor plate with the composition ≤ 0.03% C, ≤ 0.1% Si, ≤ 0.1% Mn, ≤ 0.01% P, ≤ 0.01% S, 0.05 to 0.15% Al, 17.0 to 19.0% Ni, 7.0 to 16.0% Co, 4.0 to 6.5% Mo and 0.5 to 2% Ti, if appropriate also ≤ 0.5% Cr, ≤ 0.5% Cu, ≤ 0.2% Nb, ≤ 0.2% V, ≤ 0.2% Zr and / or ≤ 0.2% W, remainder Fe and process-related impurities, is known from the material sheet "DILLIDUR X" of the DILLINGER HÜTTE GTS (specification DH- D 02- B, edition 11.1992) as well as through use. It is offered in the material sheet in sheet thicknesses from 4.5 to 9.0 mm (now enlarged to 12.0 mm) for protection e.g. of cars and vans against shelling and exposure to explosives. The steel, especially after the Cut out and, if necessary, other forms of cutting, by heating to a temperature hardened under the transformation temperature martensite → austenite.

Aus der Patentliteratur weiterhin bekannt sind zu gleichen Zwecken Verbundstähle mit einer härteren Außenlage und einer zäheren Innenlage.Composite steels with a are also known from the patent literature for the same purposes harder outer layer and a tougher inner layer.

Die DE-A-43 44 879 beschreibt einen solchen Verbundstahl aus martensitaushärtenden Stählen. Die Außenlage weist 4,0 bis 6,0% Mo, 17,0 bis 18,0% Ni, < 0,05% Cr, 1,7 bis 1,8% Ti und 14,0 bis 15,0% Co auf, die Innenlage 4,0 bis 6,0% Mo, 17,0 bis 18,0% Ni, < 0,08% Cr, 0,5 bis 0,8% Ti und 7,0 bis 9,0% Co; beide Lagen enthalten femer < 0,02% C, < 0,06% Si, < 0,01% Mn, < 0,01% P, < 0,01% S und unter < 0,02% Cu. Das Dickenverhältnis der Außenlage zur Innenlage soll etwa 3:2 betragen.DE-A-43 44 879 describes such a composite steel made of martensitic hardening Steels. The outer layer has 4.0 to 6.0% Mo, 17.0 to 18.0% Ni, <0.05% Cr, 1.7 to 1.8% Ti and 14.0 to 15.0% Co, the inner layer 4.0 to 6.0% Mo, 17.0 to 18.0% Ni, <0.08% Cr, 0.5 to 0.8% Ti and 7.0 to 9.0% Co; both layers also contain <0.02% C, <0.06% Si, <0.01% Mn, <0.01% P, <0.01% S and below <0.02% Cu. The thickness ratio of the outer layer to the inner layer should be about 3: 2.

Referiert ist in der genannten Patentschrift die DE-C-29 21 854 mit dem Hinweis, der in dieser Veröffentlichung angegebene Verbundstahl sei nur bedingt einsetzbar, da die beiden fest miteinander verbundenen Stähle unterschiedliche Ausdehnungskoeffizienten besitzen, so dass es zu Verformungen kommen könne.
Die Zusammensetzungen sind hier andere, es handelt sich um kein martensitaushärtendes Material. Die Offenlegungsschrift befasst sich vornehmlich mit der Schweißbarkeit; vorgesehen ist, die Bleche nur an der weicheren Innenlage zu verschweißen.
Als Stand der Technik erwähnt ist die Verschweißung bestimmter Panzerbleche im Zweiten Weltkrieg, die eine oberflächengehärtete dünne Schicht martensitischen Charakters und auf der anderen Seite eine dicke perlitisch-ferritische Zone aufwiesen, die, wenn auch unter Schwierigkeiten, geschweißt werden konnte. Kritisiert ist an diesem Stand der Technik, die äußere Schicht sei dünn und spröde gewesen, darin entstandene Risse konnten sich bis in den weicheren Bereich fortleiten. Die Herstellung sei aufwendig und mit Verzug der Konstruktion verbunden. Gegenwärtige Anforderungen werden nicht mehr erfüllt.DE-C-29 21 854 is referenced in the cited patent specification with the note that the composite steel specified in this publication can only be used to a limited extent, since the two firmly connected steels have different expansion coefficients, so that deformations can occur.
The compositions here are different, it is not a martensitic material. The published specification primarily deals with weldability; it is intended to weld the sheets only on the softer inner layer.
The state of the art mentioned is the welding of certain armor plates in World War II, which had a surface-hardened thin layer of martensitic character and on the other hand a thick pearlitic-ferritic zone that could be welded, albeit with difficulty. One criticism of this state of the art is that the outer layer was thin and brittle, and cracks that formed in it were able to spread into the softer area. The production is complex and associated with a delay in the construction. Current requirements are no longer met.

Ferner ist ohne Kritik die DE-A-21 42 360 erwähnt, die eine Panzerung aus einem weiteren Verbundstahl zum Inhalt hat.Furthermore, DE-A-21 42 360 is mentioned without criticism, which armor from another Composite steel for the content.

Die DE-A-43 09 558 befasst sich mit Geschossen, die zwar beim Eindringen in das Stahlblech einen wesentlichen Teil ihrer Energie verlieren, trotzdem aber das Stahlblech durchstoßen. Diesen soll durch eine auf der Rückseite des Stahlbleches anvulkanisierte oder angeklebte Kunststoffbeschichtung, insbesondere Aramidbeschichtung, entgegengewirkt werden.DE-A-43 09 558 is concerned with projectiles which penetrate the steel sheet lose a substantial part of their energy, but still pierce the steel sheet. This is to be vulcanized or glued to the back of the steel sheet Plastic coating, especially aramid coating, can be counteracted.

Aus der US-A-4,969,378 ist ein Bohrkopf aus einem martensitaushärtenden Stahl bekannt, der in Mehrzahl frei drehend auf einer Bohrkrone eines Gesteinsbohrers anzuordnen ist. Der Bohrkopf wird nitriergehärtet, um die Gleitfähigkeit seiner Lagerbohrung auf einem zementierten Achszapfen zu erhöhen. Zugleich wird die Abriebfestigkeit der mit Schneideinsätzen versehenen Oberfläche erhöht.
Gegenstand der WO-A-96 32 508 ist ein Schraubendreher. Zur Steigerung seiner Verschleißfestigkeit und Lebensdauer soll er bevorzugt aus einem martensitaushärtenden Stahl bestehen und nitriergehärtet werden.From US-A-4,969,378 a drill head made of a martensitic steel is known, which is to be arranged in a freely rotating manner on a drill bit of a rock drill. The drill head is nitrided to increase the sliding ability of its bearing bore on a cemented journal. At the same time, the abrasion resistance of the surface provided with cutting inserts is increased.
The subject of WO-A-96 32 508 is a screwdriver. To increase its wear resistance and service life, it should preferably consist of a martensitic steel and be nitrided.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Panzerungsblech zur Verfügung zu stellen, das mit vergleichsweise geringem Aufwand einen Schutz ermöglicht, der hohen Sicherheitsanforderungen gerecht wird.The present invention has for its object to provide an armor plate to provide, which allows protection with comparatively little effort, the high Security requirements.

Die Erfindung erfüllt diesen Zweck durch die Verwendung eines martensitaushärtenden Stahles, insbesondere der Zusammensetzung ≤ 0,03% C, ≤ 0,1% Si, ≤ 0,1% Mn, ≤ 0,01% P, ≤ 0,01% S. 0,05 bis 0,15% Al, 17,0 bis 19.0% Ni, 7,0 bis 16,0% Co, 4,0 bis 6,5% Mo und 0,5 bis 2% Ti. ggf. ferner ≤ 0,5% Cr, ≤ 0,5% Cu, ≤ 0,2% Nb, ≤ 0,2% V, ≤ 0,2% Zr und/oder ≤ 0,2% W, Rest Fe und verfahrensbedingte Verunreinigungen, der durch Erwärmen auf eine Temperatur unter der Umwandlungstemperatur Martensit → Austenit worden ist und bei dem auf der Einwirkungsseite anschließend zusätzlich eine Oberflächenhärtung durch Nitrieren, Carbonitrieren oder Sulfonitrieren vorgenommen worden ist unter Anwendung einer Temperatur, die gleichfalls unter der Umwandlungstemperatur Martensit → Austenit liegt,
in Form eines Panzerungsbleches zum Schutz vor Beschuss und Explosionseinwirkung.The invention fulfills this purpose by using a martensitic steel, in particular the composition ≤ 0.03% C, ≤ 0.1% Si, ≤ 0.1% Mn, ≤ 0.01% P, ≤ 0.01% S. 0.05 to 0.15% Al, 17.0 to 19.0% Ni, 7.0 to 16.0% Co, 4.0 to 6.5% Mo and 0.5 to 2% Ti 0.5% Cr, ≤ 0.5% Cu, ≤ 0.2% Nb, ≤ 0.2% V, ≤ 0.2% Zr and / or ≤ 0.2% W, remainder Fe and process-related impurities, the by heating to a temperature below the transformation temperature of martensite → austenite, and then additionally hardening the surface by nitriding, carbonitriding or sulfonitriding using a temperature which is also below the transformation temperature of martensite → austenite,
in the form of an armor plate to protect against shelling and explosion.

Die Beschußsicherheit konnte auf diesem Wege mit einer Nitrierbehandlung bei gleicher Blechdicke von 9 mm um im Mittel mehr als 15% gesteigert werden. Umgekehrt ist bei gleicher Schutzwirkung eine Verringerung der Blechdicke um 0,4 mm und damit eine entsprechende Gewichtseinsparung möglich.In this way, the security against shelling could be treated with a nitriding treatment Sheet thickness of 9 mm can be increased by an average of more than 15%. The reverse is the same Protective effect a reduction in the sheet thickness by 0.4 mm and thus a corresponding Weight saving possible.

Die gehärtete Schicht hat dabei nur eine Dicke von 0,10 bis 0,15 mm, innerhalb derer überdies die Stickstoffkonzentration und damit die Härte kontinuierlich abnimmt.
Bei den Verbundstählen beträgt demgegenüber die Schichtdicke der harten Schicht 3 bis 6 mm und es besteht eine Grenzfläche zwischen den Lagen, die immer eine Schwachstelle bildet.The hardened layer only has a thickness of 0.10 to 0.15 mm, within which the nitrogen concentration and thus the hardness continuously decrease.
In contrast, in the case of composite steels, the layer thickness of the hard layer is 3 to 6 mm and there is an interface between the layers, which always forms a weak point.

Im Unterschied zu der offenbar flammgehärteten, etwa 4 bis 5 mm dicken Schicht der erwähnten Panzerbleche ist die bei wesentlich niedrigerer Temperatur entstandene, nach der Erfindung bevorzugt vorgesehene Nitrierschicht rissefrei und gleichmäßig in das Blech eingebunden. Das Blech bleibt ohne Verzug.In contrast to the apparently flame-hardened, about 4 to 5 mm thick layer of the mentioned Armored sheet is the one created at a much lower temperature, according to the Invention preferably provided nitriding layer crack-free and evenly integrated into the sheet. The sheet remains without warpage.

Als die Nitrierbehandlung steht insbesondere Plasmanitrieren in Betracht.Plasma nitriding is particularly suitable as the nitriding treatment.

Das Verfahren kann auch auf die äußere Lage eines Verbundstahlbleaes angewandt werden.

  • Hier schließt sich Seite 3, Zeile 12 der ursprünglichen Unterlagen an.
The method can also be applied to the outer layer of a composite steel blade.
  • This is followed by page 3, line 12 of the original documents.

Beispiel:Example:

Bleche von 9 mm Dicke mit der Zusammensetzung 0,003% C, 0,03% Si, 0,02% Mn, 0,002% P, 0,003% S, 0,001% N, 0,10% Al, 4,06% Mo, 18,50% Ni, 11,35% Co und 1,24% Ti wurden lösungsgeglüht und durch Auslagerung gehärtet.Sheets of 9 mm thickness with the composition 0.003% C, 0.03% Si, 0.02% Mn, 0.002% P, 0.003% S, 0.001% N, 0.10% Al, 4.06% Mo, 18.50% Ni, 11.35% Co and 1.24% Ti were solution annealed and hardened by aging.

Ein Teil der Bleche wurde daraufhin geschliffen und durch Plasmanitrierung zusätzlich oberflächengehärtet.Part of the sheets were then ground and additionally surface hardened by plasma nitriding.

Eine erste Probe der nitrierten Bleche zeigte eine metallographisch bestimmte Nitrierhärtetiefe von 0,11 mm. Die Härte betrug im Abstand von der Oberseite [mm] 0,04 0,12 0,20 0,28 0,36 0,44 Härte HRC 60,6 59,4 57,5 56,3 57,1 58,1. A first sample of the nitrided sheets showed a metallographically determined depth of nitriding of 0.11 mm. The hardness was Distance from the top [mm] 0.04 0.12 0.20 0.28 0.36 0.44 Hardness HRC 60.6 59.4 57.5 56.3 57.1 58.1.

Eine zweite Probe zeigte eine metallographisch bestimmte Nitrierhärtetiefe von 0,10 mm. Die Härte betrug im Abstand von der Oberseite [mm] 0,04 0,12 0,20 0,28 0,36 0,44 HRC 61,0 57,9 57,6 57,1 58,8 58,1. A second sample showed a metallographically determined depth of nitriding of 0.10 mm. The hardness was Distance from the top [mm] 0.04 0.12 0.20 0.28 0.36 0.44 HRC 61.0 57.9 57.6 57.1 58.8 58.1.

Die Beschußsicherheit der verschiedenen Bleche wurde von zwei Beschußämtern untersucht. Ergebnis:

Figure 00050001
The fire safety of the various sheets was examined by two bullet offices. Result:
Figure 00050001

In dem nachstehenden Diagramm ist die Abhängigkeit der Beschußsicherheit von der Blechdicke für Stähle vergleichbarer Zusammensetzung aufgetragen.

Figure 00050002
The diagram below shows the dependence of the bullet resistance on the sheet thickness for steels of comparable composition.
Figure 00050002

Ausgehend von dieser Abhängigkeit findet man für die erzielte Verbesserung der Beschußsicherheit von 15% den Gegenwert von 0,4 mm Blechdicke.On the basis of this dependency one finds for the improvement of the bullet security achieved of 15% the equivalent of 0.4 mm sheet thickness.

Erfordert beispielsweise die Ausstattung eines Fahrzeugs in einem bestimmten Beschußsicherheitsniveau 900 kg Blech von 7,7 mm Dicke, so bedeutet die nach der Erfindung mögliche Verringerung um 0,4 mm eine Gewichtseinsparung von rund 50 kg bzw. 5,5%.For example, it requires a vehicle to be equipped with a certain level of bullet security 900 kg of sheet metal with a thickness of 7.7 mm means what is possible according to the invention Reduction by 0.4 mm, a weight saving of around 50 kg or 5.5%.

Claims (4)

  1. Use of a maraging steel, in particular having a composition comprising ≤0.03% of C, ≤0.1% of Si, ≤0.1% of Mn, ≤0.01% of P, ≤0.01% of S, 0.05 to 0.15% of Al, 17.0 to 19.0% of Ni, 7.0 to 16.0% of Co, 4.0 to 6.5% of Mo and 0.5 to 2% of Ti, and optionally also ≤0.5% of Cr, ≤0.5% of Cu, ≤0.2% of Nb, ≤0.2% of V, ≤0.2% of Zr and/or ≤0.2% of W, remainder Fe and production-related impurities, which has been age-hardened by heating to a temperature which is below the martensite → austenite transition temperature, and in which, on the action side, a surface hardening treatment has then additionally been performed by nitriding, carbonitriding or sulfonitriding using a temperature which is likewise below the martensite → austenite transition temperature,
    in the form of an armour plate to protect against bombardment and explosions.
  2. Use according to Claim 1, characterized in that the age-hardening of the armour plate is carried out after the blank has been cut out and shaped.
  3. Use according to Claim 1 or 2 of a steel in which a plasma nitriding treatment has been carried out.
  4. Use according to one of Claims 1 to 3 in the form of a composite steel sheet, in which the outer layer has been surface-hardened by nitriding, carbonitriding or sulfonitriding.
EP99123069A 1998-12-11 1999-11-20 Use of a maraging steel as an armour plate Expired - Lifetime EP1008659B1 (en)

Applications Claiming Priority (2)

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DE19857156 1998-12-11
DE19857156A DE19857156B4 (en) 1998-12-11 1998-12-11 Use of an armor plate made of martensitaushärtendem steel

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EP1008659A1 EP1008659A1 (en) 2000-06-14
EP1008659B1 true EP1008659B1 (en) 2003-06-25

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AT (1) ATE243768T1 (en)
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Publication number Priority date Publication date Assignee Title
WO2006122731A1 (en) * 2005-05-20 2006-11-23 Carl Aug. Picard Gmbh & Co. Kg Safety armour for protection against bombardment and method for producing same
DE102007039993A1 (en) 2007-08-23 2009-02-26 Edag Gmbh & Co. Kgaa Structural part for use in vehicle e.g. passenger car, has ballistic plate three-dimensionally molded into piece by using process of hot deformation in molding press and hardened by using vacuum oven after hot deformation
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

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DE19961948A1 (en) * 1999-12-22 2001-06-28 Dillinger Huettenwerke Ag Composite steel sheet, in particular for protecting vehicles against shelling
US7754028B2 (en) * 2002-07-29 2010-07-13 Koninklijke Philips Electronics N.V. Plasma-nitriding of maraging steel, shaver cap for an electric shaver, cutting device made out of such steel and an electric shaver
DE102008010168B4 (en) * 2008-02-20 2010-04-22 Benteler Automobiltechnik Gmbh Armor for a vehicle
DE102010005262B4 (en) 2009-01-21 2019-09-12 Bayerische Motoren Werke Aktiengesellschaft Process for the production of a hard material coating tools and their uses
DE102010047020A1 (en) * 2010-09-30 2012-04-05 Obeko Gmbh Producing an ultrahard protective coating on components of a safety equipment, comprises providing the component comprising a surface to be coated, and applying a coating mixture to the surface by a thermal spraying method
DE102012007292A1 (en) * 2012-04-12 2013-10-17 Linde Aktiengesellschaft Method and treatment section for partially refining a metal product
DE102015116619B4 (en) 2015-09-30 2018-11-29 Thyssenkrupp Ag Production of semi-finished products and structural components with regionally different material thicknesses
CN112251684B (en) * 2020-09-29 2022-02-15 中国科学院金属研究所 Micro-nanocrystalline maraging steel and preparation method thereof
CN113549842A (en) * 2021-06-21 2021-10-26 首钢集团有限公司 High-strength bulletproof helmet shell and preparation method thereof
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ES2202992T3 (en) 2004-04-01
DE19857156B4 (en) 2005-03-24
DE59906082D1 (en) 2003-07-31
DE19857156A1 (en) 2000-06-21
EP1008659A1 (en) 2000-06-14

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