EP1239257A1 - Method for producing gun barrels - Google Patents

Method for producing gun barrels Download PDF

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Publication number
EP1239257A1
EP1239257A1 EP02002665A EP02002665A EP1239257A1 EP 1239257 A1 EP1239257 A1 EP 1239257A1 EP 02002665 A EP02002665 A EP 02002665A EP 02002665 A EP02002665 A EP 02002665A EP 1239257 A1 EP1239257 A1 EP 1239257A1
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EP
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Prior art keywords
max
vanadium
molybdenum
manganese
phosphorus
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EP02002665A
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German (de)
French (fr)
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EP1239257B1 (en
Inventor
Walter Grimm
Wolfgang Arrenbrecht
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Buderus Edelstahl GmbH
Rheinmetall W&M GmbH
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Buderus Edelstahl GmbH
Rheinmetall W&M GmbH
Edelstahlwerke Buderus AG
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • 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
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • C21D9/12—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes barrels for ordnance
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/20—Barrels or gun tubes characterised by the material
    • 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
    • C21D2261/00—Machining or cutting being involved

Definitions

  • the invention relates to a method for producing cannon and gun barrels of caliber 105-120 mm.
  • the standard material for these products is steel 35NiCrMoV 12-5, material no. 1.6959, described in the steel-iron list of the publishing house Stahleisen, Düsseldorf and in the material data sheet "tubular steel for heavy guns" of the BWB.
  • the manufacturing process for cannon tube blanks includes the steps of open melting, casting of ingots in suitable mold formats, forging the cannon tube blanks to an outer rough contour, annealing the forgings, pre-turning and predrilling the parts, hollow tempering (hardening and tempering to order stability), measuring the Delay in hardness or impact (maximum straightness deviation from the longitudinal axis in relation to the bearing points at the tube ends), mechanical straightening to ensure that it is free from impact and then relaxing approx. 30 ° C below the tempering temperature, quality checks and finishing to the delivery dimensions of the gun barrel blanks.
  • the work step is a qualitative problem in the conventional manufacturing process Focus on freedom from impact after the remuneration treatment because straightening does not achieve the straightness of the hole and plastic Residual stresses are induced.
  • a bended hole after straightening during subsequent boring to order size to straighten again and on the other hand remain despite the relaxation glow residual stresses in the material after straightening.
  • a) odd holes and residual stresses cause distortion the finishing of the pipes, which can only be compensated by further straightening operations
  • b) due to dimensional errors due to the delay during processing Rejects can arise and c) due to the shot accuracy (system error)
  • Straightness deviations in the bore and released internal stresses can be worsened by fire.
  • the purpose of the invention is to avoid the inaccuracies mentioned and the manufacturing difficulties associated with them, and the method specified in the claim is proposed to solve this problem.
  • the peculiarity is the tempering of the pipe blanks without drilling (tempered solid pipe).
  • the maximum warpage of the pre-turned blanks remained constant under 10 mm in this process.
  • the existing allowance of the tempered blanks allows the hole to be drilled in such a way that an exact centricity with respect to the bearing points is achieved at the end.
  • the drilling of the hole is carried out on modern deep hole drilling machines and, with the usual strengths of ⁇ 1300 N / mm 2, does not require much more effort than the conventional steps of pre-drilling in the annealed condition (strength ⁇ 1000 N / mm 2 ) and finish drilling after quenching and tempering.
  • the mechanical straightening previously required after tempering is no longer required.
  • a so-called "fat" analysis layer should be set according to the respective hardening cross-section and a fine-grained, uniform structure should be adjusted by temperature and deformation-controlled forging.
  • the mechanical quality values to be achieved are equivalent to the values of a hollow remuneration.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Forging (AREA)
  • Heat Treatment Of Steel (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

Production of tubes comprises twisting forged pieces from a molten block made from a tempered steel; initially hardening the blanks obtained; annealing; boring; and finishing. The tempered steel contains (in wt.%) 0.20-0.50 carbon, ≤ 1.0 silicon, ≤ 1.0 manganese, ≤ 0.03 phosphorus, ≤ 0.03 sulfur, ≤ 0.1 aluminum, ≤ 2 chromium, ≤ 4 nickel, ≤ 1 molybdenum, ≤ 0.5 vanadium and a balance of iron. Preferred Features: The tempered steel contains (in wt.%) 0.30-0.40 carbon, 0.15-0.35 silicon, 0.40-0.70 manganese, ≤ 0.015 phosphorus, ≤ 0.010 sulfur, ≤ 0.015 aluminum, 1.0-1.40 chromium, 2.50-3.50 nickel, 0.35-0.60 molybdenum, 0.08-0.20 vanadium and a balance of iron.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Herstellung von Kanonen- und Geschützrohren der Kaliber 105 - 120 mm.
Standardwerkstoff für diese Produkte ist der Stahl 35NiCrMoV 12-5, Werkstoff-Nr. 1.6959, beschrieben in der Stahl-Eisen-Liste des Verlags Stahleisen, Düsseldorf und in dem Werkstoff-Leistungsblatt "Rohrstahl für schwere Geschütze" des BWB.
Der Herstellprozess für Kanonenrohr-Rohlinge umfasst dabei die Arbeitsschritte offene Erschmelzung, Abgießen von Rohblöcken in geeigneten Kokillenformaten, Schmieden der Kanonenrohr-Rohlinge auf äußere Grobkontur, Glühen der Schmiedestücke, Vordrehen und Vorbohren der Teile, Hohlvergüten (Härten und Anlassen auf Bestellfestigkeit), Messen des Härteverzugs bzw. Schlags (maximale Geradheitsabweichung von der Längsachse bezogen auf die Lagerstellen an den Rohrenden), mechanisches Richten auf Schlagfreiheit und anschließendes Entspannen ca. 30 °C unterhalb der Anlasstemperatur, Durchführung von Qualitätsprüfungen und Fertigbearbeitung auf Liefermaß der Kanonenrohr-Rohlinge.The invention relates to a method for producing cannon and gun barrels of caliber 105-120 mm.
The standard material for these products is steel 35NiCrMoV 12-5, material no. 1.6959, described in the steel-iron list of the publishing house Stahleisen, Düsseldorf and in the material data sheet "tubular steel for heavy guns" of the BWB.
The manufacturing process for cannon tube blanks includes the steps of open melting, casting of ingots in suitable mold formats, forging the cannon tube blanks to an outer rough contour, annealing the forgings, pre-turning and predrilling the parts, hollow tempering (hardening and tempering to order stability), measuring the Delay in hardness or impact (maximum straightness deviation from the longitudinal axis in relation to the bearing points at the tube ends), mechanical straightening to ensure that it is free from impact and then relaxing approx. 30 ° C below the tempering temperature, quality checks and finishing to the delivery dimensions of the gun barrel blanks.

Als qualitatives Problem stellt sich beim herkömmlichen Fertigungsverfahren der Arbeitsschritt Richten auf Schlagfreiheit im Anschluss an die Vergütungsbehandlung dar, weil durch das Richten die Geradheit der Bohrung nicht erreicht wird und plastische Eigenspannungen induziert werden. Zum Einen gelingt es technisch nicht mehr, eine nach dem Richten verkrümmte Bohrung beim nachfolgenden Aufbohren auf Bestellmaß wieder zu begradigen und zum Anderen verbleiben trotz Entspannungsglühung nach dem Richten noch Resteigenspannungen im Material. In der Praxis hat sich gezeigt, dass a) ungerade Bohrungen und Eigenspannungen zum Verzug bei der Fertigbearbeitung der Rohre führen, der nur durch weitere Richtoperationen ausgeglichen werden kann, b) durch Maßfehler infolge des Verzugs während der Bearbeitung Ausschuss entstehen kann und c) die Schussgenauigkeit (Systemfehler) wegen Geradheitsabweichungen in der Bohrung und freiwerdender Eigenspannungen beim Beschuss verschlechtert werden kann.The work step is a qualitative problem in the conventional manufacturing process Focus on freedom from impact after the remuneration treatment because straightening does not achieve the straightness of the hole and plastic Residual stresses are induced. On the one hand, it is no longer technically possible a bended hole after straightening during subsequent boring to order size to straighten again and on the other hand remain despite the relaxation glow residual stresses in the material after straightening. In practice it has it has been shown that a) odd holes and residual stresses cause distortion the finishing of the pipes, which can only be compensated by further straightening operations b) due to dimensional errors due to the delay during processing Rejects can arise and c) due to the shot accuracy (system error) Straightness deviations in the bore and released internal stresses can be worsened by fire.

Als Ursache für den Härteverzug sind, wie die Untersuchungen im Rahmen der Erfindungstätigkeit gezeigt haben, drei Hauptmechanismen verantwortlich:

  • 1. Asymmetrische Temperaturverteilungen im Rohrrohling können entstehen durch ungleichmäßige Erwärmung, ungleichmäßige Ofentemperaturen oder ungleichmäßige Durchwärmung. Sie können beseitigt werden durch homogene Erwärmung und präzise Temperaturverteilung im Ofenraum - eine Kontrolle kann durch Thermoelemente am Stück erfolgen. Hierzu trägt ggf. auch das Drehen des Rohres während der gesamten Wärmebehandlung bei.
  • 2. Mechanisches Verziehen während der Erwärmung und Austenitisierung auf Härtetemperatur entsteht beim Durchbiegen im Fall horizontaler Erwärmung und bei starrer Aufhängung bei vertikaler Härtung infolge Biegemomentbildung durch Eigengewicht oder Horizontalbewegung beim Härten. Dieser Verzug kann vermieden werden durch hängendes (vertikales) Vergüten der Rohre mit kardanischer Aufhängung, so dass kein Biegemoment in den Rohren am Aufhängende im Fall von horizontaler Bewegung entstehen kann.
  • 3. Asymmetrische Umwandlungsspannungen
    Beim Härten der vorgebohrten Rohrrohlinge wird durch Wasser-Beaufschlagung sowohl die äußere Oberfläche wie auch die Bohrung möglichst gleichmäßig abgekühlt. Bei Erreichen der Martensit-Start-Temperatur von ca. 350 °C im Werkstoff beginnt das austenitische Gefüge sich in das martensitische Härtungsgefüge umzuwandeln. Bei verzugsarmer Härtung erfolgt die Umwandlung über den gesamten Umfang gleichmäßig von außen (Oberfläche) nach innen und von innen (Bohrung) nach außen bis sich die Umwandlungsfronten treffen und der gesamte Rohrquerschnitt gehärtet ist. Liegen im Bauteil herstellungsbedingt die Kernseigerungen asymmetrisch vor, so beginnen die von der Bohrung ausgehenden Umwandlungsvorgänge entsprechend den unterschiedlichen lokalen Analysenlagen zwangsläufig zu unterschiedlichen Zeitpunkten. Dies führt zu einer asymmetrischen Verteilung der Umwandlungsspannungen über den Rohrquerschnitt und damit zum Härteverzug.
    • As the studies within the scope of the invention have shown, three main mechanisms are responsible for the delay in hardness:
  • 1. Asymmetrical temperature distributions in the pipe blank can result from uneven heating, uneven furnace temperatures or uneven heating. They can be eliminated by homogeneous heating and precise temperature distribution in the furnace chamber - one piece can be checked by thermocouples. The turning of the tube during the entire heat treatment may also contribute to this.
  • 2. Mechanical warping during heating and austenitizing to hardening temperature occurs when bending in the case of horizontal heating and in the case of rigid suspension in the case of vertical hardening as a result of bending moment formation due to dead weight or horizontal movement during hardening. This warping can be avoided by hanging (vertical) tempering of the pipes with cardanic suspension, so that no bending moment can occur in the pipes at the hanging end in the event of horizontal movement.
  • 3. Asymmetric transformation voltages
    When the pre-drilled pipe blanks are hardened, both the outer surface and the bore are cooled as evenly as possible by exposure to water. When the martensite start temperature of approx. 350 ° C in the material is reached, the austenitic structure begins to transform into the martensitic hardening structure. With hardening with little distortion, the conversion takes place evenly over the entire circumference from the outside (surface) to the inside and from the inside (bore) to the outside until the conversion fronts meet and the entire pipe cross section is hardened. If the nuclear segregations are asymmetrical in the component due to the manufacturing process, the conversion processes starting from the drilling necessarily begin at different times in accordance with the different local analysis positions. This leads to an asymmetrical distribution of the transformation stresses over the pipe cross-section and thus to a delay in hardness.

    • In der Praxis der Herstellung von Kanonenrohren hat sich gezeigt, dass zwar der Umwandlungsbeginn an der äußeren Oberfläche.in Umfangsrichtung symmetrisch erfolgt, nicht aber im Bereich der Bohrung. Die Ursache dafür liegt primär in der Asymmetrie der Bohrung bezogen auf die Achse des Rohblockes, bzw. bezogen auf die Erstarrungssymmetrie des Blockes (Bild 1).
    Durch nicht vollständig zu vermeidenden ungleichmäßigen Matenalfluss sowie Abmessungstoleranzen (Versatz) beim Schmieden ist eine Exzentrizität der Bohrung, bezogen auf die ehemalige Blockachse, nicht immer zu vermeiden. Damit entstehen auch seigerungsbedingt asymmetrische Analysenkonzentrationen an der Bohrungsoberfläche als Ursache für ungleichmäßige Umwandlungsspannungen im Rohrlnneren und damit Verzug.
    Der.Erfindung liegt die Aufgabe zugrunde, die genannten Ungenauigkeiten und damit verbundenen Fertigungsschwierigkeiten zu vermeiden, und zur Lösung dieser Aufgabe wird das im Patentanspruch angegebene Verfahren vorgeschlagen. Die Besonderheit ist dabei das Vergüten der Rohr-Rohlinge ohne Bohrung (Vergütetes Vollrohr). Der maximale Verzug der außen vorgedrehten Rohlinge blieb bei diesem Verfahren konstant unter 10 mm. Das vorhandene Aufmaß der vergüteten Rohlinge erlaubt es, anschließend die Bohrung so einzubringen, dass am Ende eine exakte Zentrizität mit Bezug auf die Lagerstellen erreicht wird. Das Einbringen der Bohrung erfolgt auf modernen Tieflochbohrmaschinen und erfordert bei üblichen Festigkeiten von < 1300 N/mm2 keinen wesentlich höheren Aufwand gegenüber den herkömmlichen Arbeitsschritten Vorbohren in geglühtem Zustand (Festigkeit < 1000 N/mm2) und Fertigbohren nach dem Vergüten. Das bisher nach dem Vergüten notwendige mechanische Richten entfällt.
    Zur Sicherstellung einer einwandfreien Durchvergütung und ausreichender mechanischer Gütewerte sollte eine sogenannte "fette" Analysenlage entsprechend dem jeweiligen Vergütungsquerschnitt eingestellt werden und durch temperatur- und verformungskontrolliertes Schmieden ein feinkörniges, gleichmäßiges Gefüge eingestellt werden. Die dabei zu erzielenden mechanischen Gütewerte sind gleichwertig zu den Werten einer Hohlvergütung.    In the practice of producing cannon tubes, it has been shown that the start of the transformation on the outer surface occurs symmetrically in the circumferential direction, but not in the area of the bore. The reason for this lies primarily in the asymmetry of the hole in relation to the axis of the ingot, or in relation to the solidification symmetry of the block (Figure 1).
    Due to the uneven material flow, which cannot be completely avoided, as well as dimensional tolerances (misalignment) during forging, an eccentricity of the hole with respect to the former block axis cannot always be avoided. This also results in asymmetrical analysis concentrations on the surface of the bore caused by segregation as the cause of uneven transformation stresses inside the pipe and thus distortion.
    The purpose of the invention is to avoid the inaccuracies mentioned and the manufacturing difficulties associated with them, and the method specified in the claim is proposed to solve this problem. The peculiarity is the tempering of the pipe blanks without drilling (tempered solid pipe). The maximum warpage of the pre-turned blanks remained constant under 10 mm in this process. The existing allowance of the tempered blanks allows the hole to be drilled in such a way that an exact centricity with respect to the bearing points is achieved at the end. The drilling of the hole is carried out on modern deep hole drilling machines and, with the usual strengths of <1300 N / mm 2, does not require much more effort than the conventional steps of pre-drilling in the annealed condition (strength <1000 N / mm 2 ) and finish drilling after quenching and tempering. The mechanical straightening previously required after tempering is no longer required.
    In order to ensure a perfect through-hardening and sufficient mechanical quality values, a so-called "fat" analysis layer should be set according to the respective hardening cross-section and a fine-grained, uniform structure should be adjusted by temperature and deformation-controlled forging. The mechanical quality values to be achieved are equivalent to the values of a hollow remuneration.

    Die Herstellung von Panzerkanonen aus vollvergüteten, ungerichteten Rohren hat gezeigt, dass bei der weiteren Verwendung ein Maximum an Geradheit erreicht wird und die so gefertigten Rohre herkömmlich gerichteten Teilen qualitativ überlegen sind.The manufacture of armored cannons from fully tempered, non-directional tubes has shown that maximum straightness is achieved with further use and qualitatively superior the pipes manufactured in this way to conventionally directed parts are.

    Dies ist in Bild 2 veranschaulicht, wo der Mittelwert des Schlags, d.h. der Abweichung von einer geraden Linie, der im erfindungsgemäßen Verfahren vorgedrehten und vorgebohrten Rohlinge neben den Mittelwerten von nach zwei herkömmlichen Verfahren hergestellten Rohlingen gezeigt ist.This is illustrated in Figure 2, where the mean of the field, i.e. the deviation from a straight line, the one pre-turned in the method according to the invention and pre-drilled blanks in addition to the mean values from after two conventional ones Process manufactured blanks is shown.

    Claims (3)

    Verfahren zur Herstellung von Rohren für schwere Geschütze im Kaliberbereich 105 mm und größer aus Vergütungsstahl, bestehend
    aus 0,20 - 0,50 Gew.% Kohlenstoff,
    max. 1,0 Gew.% Silizium,
    max. 1,0 Gew.% Mangan,
    max. 0,03 % Phosphor
    max. 0,03 % Schwefel
    max. 0,1 % Aluminium
    max. 2 % Chrom
    max. 4 % Nickel
    max. 1 % Molybdän,
    max. 0,5 % Vanadin,
    und Rest aus Eisen und üblichen Verunreinigungen, wobei Schmiedestücke aus offen erschmolzenem Blockguss außen vorgedreht werden und die dadurch erhaltenen Rohlinge zunächst gehärtet und angelassen und anschließend gebohrt und dann fertig bearbeitet werden.    Process for the production of tubes for heavy guns in the caliber range 105 mm and larger from tempered steel, consisting of
    from 0.20 to 0.50% by weight of carbon,
    Max. 1.0% by weight of silicon,
    Max. 1.0% by weight of manganese,
    Max. 0.03% phosphorus
    Max. 0.03% sulfur
    Max. 0.1% aluminum
    Max. 2% chrome
    Max. 4% nickel
    Max. 1% molybdenum,
    Max. 0.5% vanadium,
    and the rest of iron and usual impurities, forging forgings made of openly melted ingot are first turned and the blanks thus obtained are first hardened and tempered and then drilled and then finished.         Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ein Vergütungsstahl der Zusammensetzung: 0,30 - 0,40 % Kohlenstoff, 0,15 - 0,35 % Silizium, 0,40 - 0,70 % Mangan, max. 0,015 % Phosphor, max. 0,010 % Schwefel, max. 0,015 % Aluminium, 1,0 - 1,40 % Chrom, 0,35 - 0,60 % Molybdän, 2,50 - 3,50 % Nickel, 0,08 - 0,20 % Vanadin, und Rest aus Eisen und üblichen Verunreinigungen verwendet wird. A method according to claim 1, characterized in that a tempering steel of the composition: 0.30 - 0.40% carbon, 0.15 - 0.35% silicon, 0.40 - 0.70% manganese, Max. 0.015% phosphorus, Max. 0.010% sulfur, Max. 0.015% aluminum, 1.0 - 1.40% chromium, 0.35 - 0.60% molybdenum, 2.50 - 3.50% nickel, 0.08 - 0.20% vanadium, and remainder from iron and usual impurities is used. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass ein Vergütungsstahl der Zusammensetzung: 0,30 - 0,35 % Kohlenstoff, 0,15 - 0,20 % Silizium, 0,60 - 0,70 % Mangan, max. 0,010 % Phosphor, max. 0,005 % Schwefel max. 0,015 % Aluminium 1,20 - 1,35 % Chrom, 3,30 - 3,50 % Nickel, 0,45 - 0,55 % Molybdän, 0,15 - 0,20 % Vanadin, max. 0,12 % Kupfer, max. 0,015 % Zinn, und Rest aus Eisen und üblichen Verunreinigungen verwendet wird.A method according to claim 2, characterized in that a tempering steel of the composition: 0.30 - 0.35% carbon, 0.15 - 0.20% silicon, 0.60 - 0.70% manganese, Max. 0.010% phosphorus, Max. 0.005% sulfur Max. 0.015% aluminum 1.20 - 1.35% chromium, 3.30 - 3.50% nickel, 0.45 - 0.55% molybdenum, 0.15 - 0.20% vanadium, Max. 0.12% copper, Max. 0.015% tin, and remainder from iron and usual impurities is used.
    EP02002665A 2001-03-09 2002-02-06 Method for producing gun barrels Expired - Lifetime EP1239257B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10111304 2001-03-09
    DE10111304A DE10111304C2 (en) 2001-03-09 2001-03-09 Process for the production of tubes for heavy guns

    Publications (2)

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    EP1239257A1 true EP1239257A1 (en) 2002-09-11
    EP1239257B1 EP1239257B1 (en) 2004-10-27

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    US (1) US6652680B2 (en)
    EP (1) EP1239257B1 (en)
    AT (1) ATE280938T1 (en)
    DE (2) DE10111304C2 (en)
    ES (1) ES2230400T3 (en)

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    CN102234744A (en) * 2010-04-23 2011-11-09 宝山钢铁股份有限公司 Ultra-pure alloy and method for manufacturing turbine rotor forging by using same
    US8101004B2 (en) 2006-08-03 2012-01-24 Aubert & Duval Process for manufacturing steel blanks
    US8252129B2 (en) 2006-08-03 2012-08-28 Aubert & Duval Method for transforming steel blanks
    CN107868904A (en) * 2017-09-27 2018-04-03 中原特钢股份有限公司 A kind of hydraulic breaking hammer piston steel and its manufacturing process

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    DE50202536D1 (en) * 2001-12-19 2005-04-28 Boehler Bleche Gmbh Muerzzusch Material with high ballistic protection
    JP4332070B2 (en) * 2004-06-01 2009-09-16 株式会社神戸製鋼所 High strength steel and crankshaft for large steel products
    EP2159296B1 (en) * 2007-04-13 2016-03-16 Sidenor Investigacion y Desarrollo, S.A. Hardened and tempered steel and method for producing parts of said steel
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    DE102010052628A1 (en) 2010-11-29 2012-05-31 Rheinmetall Waffe Munition Gmbh Perchlorate-free pyrotechnic mixture
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    WO2007137714A1 (en) * 2006-05-29 2007-12-06 Rheinmetall Waffe Munition Gmbh Method for the production of forged steel for weapons subject to heavy stresses, barrel blanks and a thus-equipped weapon
    US8101004B2 (en) 2006-08-03 2012-01-24 Aubert & Duval Process for manufacturing steel blanks
    CN102433511A (en) * 2006-08-03 2012-05-02 奥贝尔&杜瓦尔公司 Process for manufacturing steel blanks
    US8252129B2 (en) 2006-08-03 2012-08-28 Aubert & Duval Method for transforming steel blanks
    US8551397B2 (en) 2006-08-03 2013-10-08 Aubert & Duval Process for manufacturing steel blanks
    CN102234744A (en) * 2010-04-23 2011-11-09 宝山钢铁股份有限公司 Ultra-pure alloy and method for manufacturing turbine rotor forging by using same
    CN102234744B (en) * 2010-04-23 2013-06-26 宝山钢铁股份有限公司 Ultra-pure alloy and method for manufacturing turbine rotor forging by using same
    CN107868904A (en) * 2017-09-27 2018-04-03 中原特钢股份有限公司 A kind of hydraulic breaking hammer piston steel and its manufacturing process

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    DE10111304C2 (en) 2003-03-20
    DE10111304A1 (en) 2002-09-19
    ATE280938T1 (en) 2004-11-15
    EP1239257B1 (en) 2004-10-27
    ES2230400T3 (en) 2005-05-01
    DE50201374D1 (en) 2004-12-02
    US20020124716A1 (en) 2002-09-12

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