EP1008659A1 - Process for producing a maraging steel sheet - Google Patents

Process for producing a maraging steel sheet Download PDF

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Publication number
EP1008659A1
EP1008659A1 EP99123069A EP99123069A EP1008659A1 EP 1008659 A1 EP1008659 A1 EP 1008659A1 EP 99123069 A EP99123069 A EP 99123069A EP 99123069 A EP99123069 A EP 99123069A EP 1008659 A1 EP1008659 A1 EP 1008659A1
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EP
European Patent Office
Prior art keywords
sheet
martensite
carried out
surface hardening
maraging steel
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EP99123069A
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German (de)
French (fr)
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EP1008659B1 (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

Definitions

  • the invention relates to a method for producing a sheet of martensitic Steel, in particular of 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, optionally 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 in which the sheet, especially after cutting out and possibly other forms of cutting Heating to a temperature below the transformation temperature of martensite ⁇ austenite is cured.
  • a steel for carrying out such a method is known from the material sheet DILLIDUR X "from DILLINGER HÜTTE GTS (specification DH-D 02-B, edition 11.1992). It is available in sheet thicknesses of 4.5 to 9.0 mm to protect cars and valuables, for example, against shelling and exposure to explosives. The sheet thicknesses are now enlarged to 12.0 mm.
  • DE 43 44 879 C2 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.
  • DE-OS 21 42 360 is mentioned without criticism, the armor from another Composite steel for the content.
  • the object of the present invention is based on comparatively little effort to provide protection that meets high security requirements.
  • the invention is based on the method and provides that, in addition to the aforementioned curing, a surface hardening is carried out at a temperature which is also below the transition temperature Martensite ⁇ austenite lies.
  • the hardened layer only has a thickness of 0.10 to 0.15 mm, within which the nitrogen concentration and thus the hardness also decrease continuously.
  • 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.
  • another chemical-thermal boundary layer treatment such as carbonitriding or sulfonitriding, as well as surface finishing processes through coating, such as hard chrome plating, plasma and flame spraying of hard materials or PVD or CVD processes (physical vapor deposition or chemical vapor deposition).
  • the method can also be applied to the outer layer of a composite steel.
  • Other uses of the steel than for armoring are conceivable.
  • 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.
  • Part of the sheet was then ground and additionally surface hardened by plasma nitriding.
  • a first sample of the nitriding 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.
  • 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.

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 bezieht sich auf ein Verfahren zum Herstellen eines Bleches aus martensitaushärtendem Stahl, 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, bei dem das Blech, insbesondere nach dem Ausschneiden und ggf. sonstigen Formen des Zuschnitts, durch Erwärmen auf eine Temperatur unter der Umwandlungstemperatur Martensit → Austenit ausgehärtet wird.The invention relates to a method for producing a sheet of martensitic Steel, in particular of 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, optionally 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 in which the sheet, especially after cutting out and possibly other forms of cutting Heating to a temperature below the transformation temperature of martensite → austenite is cured.

Ein Stahl zur Durchführung eines solchen Verfahrens ist bekannt aus dem Werkstoffblatt

Figure 00010001
DILLIDUR X" der DILLINGER HÜTTE GTS (Spezifikation DH- D 02- B, Ausgabe 11.1992). Er wird angeboten in Blechdicken von 4,5 bis 9,0 mm zum Schutz z.B. von PKWs und Werttransportern gegen Beschuß und Einwirkung von Explosivstoffen. Die Blechdicken sind inzwischen auf 12,0 mm vergrößert.A steel for carrying out such a method is known from the material sheet
Figure 00010001
DILLIDUR X "from DILLINGER HÜTTE GTS (specification DH-D 02-B, edition 11.1992). It is available in sheet thicknesses of 4.5 to 9.0 mm to protect cars and valuables, for example, against shelling and exposure to explosives. The sheet thicknesses are now enlarged to 12.0 mm.

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 43 44 879 C2 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 ferner < 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 43 44 879 C2 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 29 21 854 C1 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 29 21 854 C1 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 laid-open document deals primarily with weldability; it is intended to weld the sheets only on the softer inner layer.
The welding of certain armor plates in World War II, which had a surface-hardened thin layer of a martensitic character and on the other hand a thick pearlitic-ferritic zone, is mentioned as prior art. that could be welded, albeit with difficulty. What is criticized about this state of the art is that the outer layer was thin and brittle, and cracks that formed in it could 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-OS 21 42 360 erwähnt, die eine Panzerung aus einem weiteren Verbundstahl zum Inhalt hat.Furthermore, DE-OS 21 42 360 is mentioned without criticism, the armor from another Composite steel for the content.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, mit vergleichsweise geringem Aufwand einen Schutz zu ermöglichen, der hohen Sicherheitsanforderungen gerecht wird.The object of the present invention is based on comparatively little effort to provide protection that meets high security requirements.

Die Erfindung geht zu diesem Zweck aus von dem eingangs angegebenen Verfahren und sieht vor, daß anschließend an das genannte Aushärten zusätzlich eine Oberflächenhärtung vorgenommen wird bei einer Temperatur, die gleichfalls unter der Umwandlungstemperatur Martensit→Austenit liegt.For this purpose, the invention is based on the method and provides that, in addition to the aforementioned curing, a surface hardening is carried out at a temperature which is also below the transition temperature Martensite → austenite lies.

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%. Conversely, at 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 also decrease continuously.
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 Alternativen zu der Nitrierbehandlung werden eine andere chemisch- thermische Randschichtbehandlung, wie Carbonitrieren oder Sulfonitrieren, sowie Verfahren der Oberflächenveredlung durch Beschichtung, wie Hartverchromen, Plasma- und Flammspritzen von Hartstoffen oder PVD- oder CVD- Verfahren (physical vapor deposition oder chemical vapor deposition) vorgeschlagen.As an alternative to the nitriding treatment, another chemical-thermal boundary layer treatment, such as carbonitriding or sulfonitriding, as well as surface finishing processes through coating, such as hard chrome plating, plasma and flame spraying of hard materials or PVD or CVD processes (physical vapor deposition or chemical vapor deposition).

Das Verfahren kann auch auf die äußere Lage eines Verbundstahles angewandt werden. Andere Verwendungen des Stahls als zur Panzerung sind denkbar.The method can also be applied to the outer layer of a composite steel. Other uses of the steel than for armoring are conceivable.

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 sheet was then ground and additionally surface hardened by plasma nitriding.

Eine erste Probe der nitrierien 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 nitriding 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 00040001
The fire safety of the various sheets was examined by two fire departments.
Result:
Figure 00040001

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

Figure 00040002
The diagram below shows the dependence of the bullet resistance on the sheet thickness for steels of comparable composition.
Figure 00040002

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 (5)

Verfahren zum Herstellen eines Bleches aus, martensitaushärtendem Stahl, 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, bei dem das Blech, insbesondere nach dem Ausschneiden und ggf. sonstigen Formen des Zuschnitts, durch Erwärmen auf eine Temperatur unter der Umwandlungstemperatur Martensit → Austenit ausgehärtet wird
dadurch gekennzeichnet,
daß anschließend zusätzlich eine Oberflächenhärtung vorgenommen wird unter Anwendung einer Temperatur, die gleichfalls unter der Umwandlungstemperatur Martensit → Austenit liegt.Process for producing a sheet from martensitic steel, in particular of 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, possibly further ≤ 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, at which the sheet is hardened by heating to a temperature below the transition temperature martensite → austenite, especially after cutting and possibly other forms of cutting
characterized,
surface hardening is then carried out using a temperature that is also below the transition temperature martensite → austenite. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß als die Oberflächenhärtung eine chemisch-thermische Randschichtbehandlung vorgenommen wird.Method according to claim 1,
characterized,
that a chemical-thermal boundary layer treatment is carried out as the surface hardening. Verfahren nach Anspruch 2,
dadurch gekennzeichnet,
daß eine Nitrierbehandlung, vorzugsweise eine Plasmanitrierung, vorgenommen wird,Method according to claim 2,
characterized,
that a nitriding treatment, preferably plasma nitriding, is carried out, Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß als die Oberflächenhärtung eine Hartverchromung oder eine Beschichtung mit einem sonstigen Hartstoff, vorzugsweise durch Plasma- oder Flammspritzen, PVD oder CVD, vorgenommen wird.Method according to claim 1,
characterized,
that as the surface hardening, a hard chrome plating or a coating with another hard material, preferably by plasma or flame spraying, PVD or CVD, is carried out. Verfahren nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß es auf die äußere Lage eines Verbundstahles angewandt wird.Method according to one of claims 1 to 4,
characterized,
that it is applied to the outer layer of a composite steel.
EP99123069A 1998-12-11 1999-11-20 Use of a maraging steel as an armour plate Expired - Lifetime EP1008659B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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 true EP1008659A1 (en) 2000-06-14
EP1008659B1 EP1008659B1 (en) 2003-06-25

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EP (1) EP1008659B1 (en)
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US6361883B1 (en) * 1999-12-22 2002-03-26 Aktiengesellschaft der Dillinger Hüttenwerke Composite sheet steel, in particular, for protecting vehicles against shots
WO2004013367A2 (en) * 2002-07-29 2004-02-12 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
DE102008010168A1 (en) * 2008-02-20 2009-08-27 Benteler Automobiltechnik Gmbh Armor for a vehicle
EP2650388A1 (en) * 2012-04-12 2013-10-16 Linde Aktiengesellschaft Device and treatment section for finishing a metal product section by section
CN112251684A (en) * 2020-09-29 2021-01-22 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
CN114000118A (en) * 2021-10-25 2022-02-01 哈尔滨工程大学 Preparation method of nitride layer with adjustable titanium alloy surface hardness gradient distribution layer thickness
CN114381696A (en) * 2021-11-30 2022-04-22 西安交通大学 Miniature multi-source metal ultrathin membrane electrode ultrahigh vacuum evaporation device and method

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DE102005023952B9 (en) * 2005-05-20 2007-07-26 Carl Aug. Picard Gmbh & Co. Kg Security armor for protection against fire and methods of manufacture
DE102008014914B4 (en) 2007-08-23 2013-07-04 Vps Vehicle Protection Systems Gmbh Structural part for a vehicle armor
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
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
DE102015116619B4 (en) 2015-09-30 2018-11-29 Thyssenkrupp Ag Production of semi-finished products and structural components with regionally different material thicknesses

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6361883B1 (en) * 1999-12-22 2002-03-26 Aktiengesellschaft der Dillinger Hüttenwerke Composite sheet steel, in particular, for protecting vehicles against shots
WO2004013367A2 (en) * 2002-07-29 2004-02-12 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
WO2004013367A3 (en) * 2002-07-29 2004-07-22 Koninkl Philips Electronics Nv Plasma-nitriding of maraging steel, shaver cap for an electric shaver, cutting device made out of such steel and an electric shaver
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
EP2650388A1 (en) * 2012-04-12 2013-10-16 Linde Aktiengesellschaft Device and treatment section for finishing a metal product section by section
CN112251684A (en) * 2020-09-29 2021-01-22 中国科学院金属研究所 Micro-nanocrystalline maraging steel and preparation method thereof
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
CN114000118A (en) * 2021-10-25 2022-02-01 哈尔滨工程大学 Preparation method of nitride layer with adjustable titanium alloy surface hardness gradient distribution layer thickness
CN114000118B (en) * 2021-10-25 2024-03-22 哈尔滨工程大学 Preparation method of titanium alloy surface hardness gradient distribution layer thickness adjustable nitride layer
CN114381696A (en) * 2021-11-30 2022-04-22 西安交通大学 Miniature multi-source metal ultrathin membrane electrode ultrahigh vacuum evaporation device and method
CN114381696B (en) * 2021-11-30 2022-10-25 西安交通大学 Miniature multi-source metal ultrathin membrane electrode ultrahigh vacuum evaporation device and method

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DE19857156B4 (en) 2005-03-24
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ES2202992T3 (en) 2004-04-01
DE19857156A1 (en) 2000-06-21
DE59906082D1 (en) 2003-07-31

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