EP0694622A1 - Corrosion resistant alloy and method for making corrosion resistant cutting tools - Google Patents

Corrosion resistant alloy and method for making corrosion resistant cutting tools Download PDF

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Publication number
EP0694622A1
EP0694622A1 EP95890122A EP95890122A EP0694622A1 EP 0694622 A1 EP0694622 A1 EP 0694622A1 EP 95890122 A EP95890122 A EP 95890122A EP 95890122 A EP95890122 A EP 95890122A EP 0694622 A1 EP0694622 A1 EP 0694622A1
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Prior art keywords
maximum
alloy
temperature
nitrogen
contents
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German (de)
French (fr)
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EP0694622B1 (en
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Manfred Ing. Gstettner
Karl Dipl.-Ing. Leban
Gerhard Dipl.-Ing. Dr. Hackl
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Voestalpine Boehler Edelstahl GmbH
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Voestalpine Boehler Edelstahl GmbH
Boehler Ybbstalwerke GmbH
Boehler Edelstahl GmbH
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    • 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
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D9/18—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for knives, scythes, scissors, or like hand cutting tools
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
    • 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
    • C21D6/04—Hardening by cooling below 0 degrees Celsius

Definitions

  • the invention relates to a corrosion-resistant alloy according to the preamble of claim 1. Furthermore, the invention relates to a method for producing cutlery with high hardness and great flexural strength according to the preamble of claim 4.
  • Corrosion-resistant alloys in particular for cutlery, are required in the food and luxury food industry, which have to withstand chemical attacks particularly well and must not cause any changes in taste and shorten the shelf life of dishes and the like.
  • the highest possible corrosion resistance and good polishability of the material used is also required for medical instruments. Both types of use also require high material toughness, hardness and good burr-free sharpenability, although there are no particularly high demands on the wear resistance of the material.
  • Stainless steels i.e. iron-based alloys with a Cr content of around 13%, e.g. DIN material No. 1.4110, are successfully used for cutlery.
  • alloys with approx. 18% Cr content e.g. material No. 1.4112, are also used, which have an increased resistance to chemical substances due to a higher Cr concentration To have an attack.
  • Alloys with approx. 18% Cr and over 0.85% C have the disadvantage, however, that the flexural toughness and the polishability can be reduced, in particular by coarse carbide precipitations, with increased wear resistance and hardness of the material. Attempts have already been made to use a steel with approx.
  • the object of the invention is now to provide a particularly corrosion-resistant alloy which is compatible with skin contact and has a high hardness, good polishability and, in particular, a high flexural toughness with high fracture resistance, which can also be used in media containing chlorine ions.
  • the invention further aims to provide a method for producing corrosion-resistant cutlery for the food industry and for medical instruments, with which the disadvantages of the known cut parts are eliminated.
  • the advantages achieved by the invention consist in particular in that the composition of the alloy with a low total carbide content ensures small carbide grain sizes as well as a high matrix hardness and thus good grinding and polishing properties and in particular good bending toughness. It is important that the sum of the carbon and nitrogen contents is in a certain range within the concentration limits. It was surprisingly found that for a steel with a chromium content of approximately 17.5% Chromium concentration in the matrix is increased by alloying with nitrogen and the corrosion resistance can thus be improved, the carbon concentration being able to be reduced without sacrificing hardenability.
  • the advantages achieved by the invention can be seen essentially in the fact that alloys can be produced economically and the best performance properties of the parts can be achieved by heat treatment of the knives and instruments made therefrom. It is important that the alloying requirements are met and that a solution structure treatment results in a homogeneous structure. Also of particular importance is a soft annealing of the material around the A3 point of the alloy before austenitizing, in order to even out the precipitation and transformation kinetics during subsequent cooling with increased intensity. A subsequent tempering treatment is carried out at a comparatively low temperature and is used in particular to relax the material.
  • At least one deep-freeze treatment of the material is carried out after hardening, in order to also convert any portion of residual austenite remaining in the structure into martensite.
  • Table 1 lists test materials and Table 2 shows a summary of the performance characteristics of the cutlery made from the materials when using different heat treatment parameters.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Articles (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Powder Metallurgy (AREA)
  • ing And Chemical Polishing (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Knives (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Dry Shavers And Clippers (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

Corrosion-resistant alloy having a hardness of more than 54 HRC consists of (in wt.%):0.40-0.85 C, up to 1.0 Si,, up to 1.4Mn, 16.0-19.0 G, 0.8-1.5 Mo, 0.05-0.2 V, up to 0.18 Ti, 0.12-0.29 N, with the proviso that Ni max is 0.25, Co max. is 0.20, Cu max is 0.25, and Ni + Co + Cu, max is 0.48. The sum of the concn. of C and N is 0.61-0.95. Also claimed is the mfr. of a corrosion-resistant cutting tool.

Description

Die Erfindung betriffl eine korrosionsbeständige Legierung nach dem Oberbegriff des Anspruches 1. Weiters bezieht sich die Erfindung auf ein Verfahren zur Herstellung von Schneidwaren mit hoher Härte und großer Biegezähigkeit gemäß dem Oberbegriff des Anspruches 4.The invention relates to a corrosion-resistant alloy according to the preamble of claim 1. Furthermore, the invention relates to a method for producing cutlery with high hardness and great flexural strength according to the preamble of claim 4.

In der Lebens- und Genußmittelindustrie werden korrosionsbeständige Legierungen, insbesondere für Schneidwaren, benötigt, welche chemischen Angriffen besonders gut widerstehen müssen und keinerlei Geschmacksveränderungen und Verkürzung der Lagerfähigkeit von Speisen und dgl. bewirken dürfen. Auch für medizinische Instrumente ist eine höchstmögliche Korrosionsbeständigkeit und gute Polierfähigkeit des dafür verwendeten Werkstoffes gefordert. Bei beiden Verwendungsarten wird auch eine hohe Materialzähigkeit sowie Härte und gratfreie gute Schärfbarkeit verlangt, wobei jedoch keine besonders hohen Anforderungen an die Verschleißfestigkeit des Werkstoffes gestellt werden.Corrosion-resistant alloys, in particular for cutlery, are required in the food and luxury food industry, which have to withstand chemical attacks particularly well and must not cause any changes in taste and shorten the shelf life of dishes and the like. The highest possible corrosion resistance and good polishability of the material used is also required for medical instruments. Both types of use also require high material toughness, hardness and good burr-free sharpenability, although there are no particularly high demands on the wear resistance of the material.

Nichtrostende Stähle, also Eisenbasislegierungen mit einem Cr-Gehalt von etwa 13 %, z.B. DIN Werkstoff Nr. 1.4110, werden mit Erfolg für Schneidwaren eingesetzt. Weil jedoch die Korrosionsbeständigkeit derartiger Werkstoffe, insbesondere in chlorionenhaltiger Umgebung, nicht immer ausreichend ist, kommen auch Legierungen mit ca. 18 % Cr-Gehalt, z.B. Werkstoff Nr. 1.4112 zum Einsatz, welche auf Grund einer höheren Cr- Konzentration eine vermehrte Beständigkeit gegen chemischen Angriff besitzen. Legierungen mit ca. 18 % Cr und über 0,85 % C haben jedoch den Nachteil, daß insbesondere durch grobe Karbidausscheidungen, zwar bei erhöhter Verschleißfestigkeit und Härte des Materials, die Biegezähigkeit und die Polierbarkeit verringert sein können. Es wurde schon versucht, einen Stahl mit ca. 15 % Cr sowie 0,3 % C, der mit 0,3 % N legiert ist, als Schneidwarenwerkstoff zu verwenden. Bei der Erzeugung dieser Stähle sind jedoch einerseits teure Druckschmelzverfahren einzusetzen, was wirtschaftliche Nachteile bringt, andererseits können die Korrosionsbeständigkeit und Schleifbarkeit sowie die Biegezähigkeit des Werkstoffes nicht immer ausreichend gute Werte liefern.Stainless steels, i.e. iron-based alloys with a Cr content of around 13%, e.g. DIN material No. 1.4110, are successfully used for cutlery. However, because the corrosion resistance of such materials, especially in an environment containing chlorine ions, is not always sufficient, alloys with approx. 18% Cr content, e.g. material No. 1.4112, are also used, which have an increased resistance to chemical substances due to a higher Cr concentration To have an attack. Alloys with approx. 18% Cr and over 0.85% C have the disadvantage, however, that the flexural toughness and the polishability can be reduced, in particular by coarse carbide precipitations, with increased wear resistance and hardness of the material. Attempts have already been made to use a steel with approx. 15% Cr and 0.3% C, which is alloyed with 0.3% N, as the cutting material. In the production of these steels, however, expensive pressure melting processes have to be used brings economic disadvantages, on the other hand, the corrosion resistance and grindability as well as the flexural toughness of the material cannot always provide sufficiently good values.

Es wurde auch gefunden, daß trotz der hohen Cr- Gehalte von korrosionsbeständigen Legierungen und der dadurch an der Oberfläche der Teile gebildeten Passivschicht von diesen gegebenenfalls durch eine zu hohe Konzentration von Ni und/oder Co und/oder Cu bei einem Kontakt mit der Haut von Lebewesen allergische Reaktionen hervorgerufen werden können.It has also been found that despite the high Cr contents of corrosion-resistant alloys and the passive layer thereby formed on the surface of the parts, these may be caused by an excessively high concentration of Ni and / or Co and / or Cu on contact with the skin of Living things can cause allergic reactions.

Aufgabe der Erfindung ist nun, eine besonders korrosionsbeständige sowie für einen Hautkontakt verträgliche Legierung mit hoher Härte, guter Polierfähigkeit und insbesondere hoher Biegezähigkeit bei hoher Bruchsicherheit, welche auch in chlorionenhaltigen Medien verwendbar ist, zu schaffen.
Weiters setzt sich die Erfindung zum Ziel, ein Verfahren zur Herstellung korrosionsbeständiger Schneidewaren für die Lebensmittelindustrie und für medizinische Instrumente anzugeben, mit welchen die Nachteile der bekannten Schneidteile beseitigt werden.The object of the invention is now to provide a particularly corrosion-resistant alloy which is compatible with skin contact and has a high hardness, good polishability and, in particular, a high flexural toughness with high fracture resistance, which can also be used in media containing chlorine ions.
The invention further aims to provide a method for producing corrosion-resistant cutlery for the food industry and for medical instruments, with which the disadvantages of the known cut parts are eliminated.

Die Aufgabe wird bei einem gattungsgemäßen Werkstoff durch die kennzeichnenden Merkmale des Anspruches 1 gelöst. Vorteilhafte Ausgestaltungen sind in den Unteransprüchen gekennzeichnet.The object is achieved in a generic material by the characterizing features of claim 1. Advantageous refinements are characterized in the subclaims.

Die weiteren Ziele werden bei einem Verfahren der eingangs genannten Art durch die im Anspruch 4 gekennzeichnete Erfindung gelöst, wobei deren Weiterbildungen in den Unteransprüchen gekennzeichnet sind.The other objectives are achieved in a method of the type mentioned at the outset by the invention characterized in claim 4, the further developments of which are characterized in the subclaims.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß die Zusammensetzung der Legierung bei einem niedrigen Gesamtkarbidanteil geringe Karbidkorngrößen sowie eine hohe Matrixhärte und dadurch eine gute Schleif- und Polierbarkeit und insbesondere eine gute Biegezähigkeit sicherstellt. Dabei ist wichtig, daß in den Konzentrationsgrenzen die Summe der Gehalte an Kohlenstoff und Stickstoff in einem bestimmten Bereich liegen. Es wurde überraschend gefunden, daß bei einem Stahl mit einem Chromgehalt von ca. 17,5 % die Chromkonzentration in der Matrix durch Zulegieren von Stickstoff erhöht und somit die Korrosionsbeständigkeit verbessert werden kann, wobei ohne Härtbarkeitseinbuße die Kohlenstoffkonzentration absenkbar ist. Die Ursachen hiefür sind wissenschaftlich noch nicht vollständig geklärt, es wird jedoch von den Erfindern angenommen, daß bei einem Stickstoffgehalt von größer als 0,1, insbesondere größer als 0,12, feine Nitride und/oder Karbonitride vorzugsweise der Elemente der IV. und V. Gruppe des periodischen Systems, z.B. Vanadin, ausgebildet werden, welche eine wesentliche Verringerung der Karbidkorngröße bewirken. Durch eine Feinkornstruktur mit den härtesteigemden Elementen Kohlenstoff und Stickstoff in Kombination werden sowohl die Matrixhärte und Matrixzähigkeit als auch deren Cr- Konzentration erhöht und eine Bildung von groben scharfkantigen Karbiden vermieden.The advantages achieved by the invention consist in particular in that the composition of the alloy with a low total carbide content ensures small carbide grain sizes as well as a high matrix hardness and thus good grinding and polishing properties and in particular good bending toughness. It is important that the sum of the carbon and nitrogen contents is in a certain range within the concentration limits. It was surprisingly found that for a steel with a chromium content of approximately 17.5% Chromium concentration in the matrix is increased by alloying with nitrogen and the corrosion resistance can thus be improved, the carbon concentration being able to be reduced without sacrificing hardenability. The causes of this have not yet been scientifically clarified, but it is believed by the inventors that with a nitrogen content of greater than 0.1, in particular greater than 0.12, fine nitrides and / or carbonitrides preferably the elements of IV. And V Group of the periodic system, for example vanadium, are formed which bring about a substantial reduction in the carbide grain size. A fine grain structure combined with the hardest elements carbon and nitrogen increases the matrix hardness and toughness as well as their Cr concentration and prevents the formation of coarse sharp-edged carbides.

Werden jedoch höhere Stickstoffgehalte als ca. 0,29 Gew.-% in der Legierung eingestellt, können grobe nadelige Nitride entstehen und eine Umwandlung des Austenits in Martensit behindert werden, was sich außerordentlich nachteilig auf die Gebrauchseigenschaften des Werkstoffes auswirkt. Die höchste Korrosionsbeständigkeit bei besten Werkstoffeigenschaften wurde im Bereich der obigen Stickstoffgehalte bei Kohlenstoffkonzentrationen zwischen 0,4 und 0,85 Gew.-% gefunden, wenn die Summe von Kohlenstoff - und Stickstoffgehalt im Bereich von 0,61 bis 0,95 liegt.However, if nitrogen contents higher than approx. 0.29% by weight are set in the alloy, coarse acicular nitrides can arise and the conversion of austenite into martensite can be hindered, which has an extremely disadvantageous effect on the properties of use of the material. The highest corrosion resistance with the best material properties was found in the range of the above nitrogen contents at carbon concentrations between 0.4 and 0.85% by weight when the sum of carbon and nitrogen contents is in the range from 0.61 to 0.95.

Bei einem Verfahren zur Herstellung korrosionsbeständiger Schneidwaren sind die durch die Erfindung erreichten Vorteile im wesentlichen darin zu sehen, daß auf wirtschaftliche Weise Legierungen herstellbar sind und durch Wärmebehandlung der daraus gefertigten Messer und Instrumente beste Gebrauchseigenschaften der Teile erreicht werden. Dabei ist wichtig, daß die legierungstechnischen Voraussetzungen gegeben werden und daß durch eine Lösungsglühbehandlung eine homogene Gefügestruktur bewirkt wird. Von besonderer Wichtigkeit ist weiters ein Weichglühen des Werkstoffes um den A3-Punkt der Legierung vor einem Austenitisieren, um die Ausscheidungs- und Umwandlungskinetik beim nachfolgenden Abkühlen mit erhöhter Intensität zu vergleichmäßigen. Eine nachfolgende Anlaßbehandlung wird bei vergleichsweise niedriger Temperatur durchgeführt und dient insbesondere der Entspannung des Materials.In a method for producing corrosion-resistant cutlery, the advantages achieved by the invention can be seen essentially in the fact that alloys can be produced economically and the best performance properties of the parts can be achieved by heat treatment of the knives and instruments made therefrom. It is important that the alloying requirements are met and that a solution structure treatment results in a homogeneous structure. Also of particular importance is a soft annealing of the material around the A3 point of the alloy before austenitizing, in order to even out the precipitation and transformation kinetics during subsequent cooling with increased intensity. A subsequent tempering treatment is carried out at a comparatively low temperature and is used in particular to relax the material.

Um eine gleichmäßige Wärmeabfuhr von der Oberfläche der Teile beim intensivierten Abkühlen von der Austenitisierungstemperatur zu erreichen und ein thermisch bedingtes Verziehen des Materials durch inhomogene Spannungen zu vermeiden, kann es von Vorteil sein, wenn ein Abkühlen zwischen zwei stabilisierenden Platten erfolgt. Dieses Abkühl- bzw. Quettenverfahren hat sich als besonders günstig für die Herstellung von großflächigen Messern mit komplizierter Schneidenform herausgestellt.In order to achieve uniform heat dissipation from the surface of the parts during intensive cooling from the austenitizing temperature and to avoid thermal distortion of the material due to inhomogeneous stresses, it can be advantageous if cooling takes place between two stabilizing plates. This cooling or squeezing process has proven to be particularly favorable for the production of large-area knives with a complicated cutting shape.

Gemäß einer weiteren bevorzugten Ausführungsform des Verfahrens wird nach dem Härten mindestens eine Tiefkühlbehandlung des Werkstoffes durchgeführt, um einem gegebenenfalls im Gefüge verbliebenen Anteil an Restaustenit ebenfalls in Martensit umzuwandeln.According to a further preferred embodiment of the method, at least one deep-freeze treatment of the material is carried out after hardening, in order to also convert any portion of residual austenite remaining in the structure into martensite.

Bei klinischen Untersuchungen wurde festgestellt, daß bei einem Gehalt von unter 0,25 Gew.-% Ni, unter 0,20 Gew.-% Co und unter 0,25 Gew.-% Cu, insbesondere bei einem Gesamtgehalt von Ni+Co+Cu von unter 0,48 Gew.-% der Legierung praktisch keine allergischen Reaktionen der Haut von Lebewesen auftreten, wobei jedoch bei besonderer Sensibilität etwas geringere Konzentrationen obiger Elemente Überempfindlichkeitsreaktionen vollkommen ausschließen.In clinical studies it was found that with a content of less than 0.25% by weight of Ni, less than 0.20% by weight of Co and less than 0.25% by weight of Cu, in particular with a total content of Ni + Co + Cu of less than 0.48% by weight of the alloy, practically no allergic reactions of the skin of living beings occur, although somewhat lower concentrations of the above elements, with particular sensitivity, completely rule out hypersensitivity reactions.

Anhand einiger Beispiele aus den Versuchsreihen sei die Erfindung näher erläutert. Es zeigen
Tabelle 1 eine Auflistung von Versuchswerkstoffen und
Tabelle 2 eine Zusammenstellung der Gebrauchseigenschaften der aus den Werkstoffen gefertigten Schneidwaren bei Anwendung unterschiedlicher Wärmebehandlungsparameter.

Figure imgb0001
Figure imgb0002
Figure imgb0003
 The invention will be explained in more detail with the aid of a few examples from the test series. Show it
Table 1 lists test materials and
Table 2 shows a summary of the performance characteristics of the cutlery made from the materials when using different heat treatment parameters.
Figure imgb0001
Figure imgb0002
Figure imgb0003

Claims (8)

Korrosionsbeständige Legierung mit einer Härte von größer als 54 HRC, guter Polierfähigkeit und hoher Biegezähigkeit enthaltend im wesentlichen die Elemente Kohlenstoff, Silizium, Mangan, Chrom, Molybdän, Vanadin, Stickstoff sowie Eisen und erzeugungsbedingte Verunreinigungen, gekennzeichnet durch einen Anteil in Gew.-%
C = 0,40 b is 0,85
Si =   bis 1,0
Mn =   bis 1,4
Cr = 16,0 bis 19,0
Mo = 0,8 bis 1,5
V = 0,05 bis 0,2
Nb =   bis 0,15
Ti   bis 0,18
N = 0,12 bis 0,29
mit der Maßgabe, daß die Gehalte an
Ni maximal 0,25
Co maximal 0,20
Cu maximal 0,25
Ni + Co +Cu maximal 0,48
betragen und die Summe der Konzentration von Kohlensotff und Stickstoff einen Wert von mindesens 0,61, höchstens jedoch 0,95 ergibt.Corrosion-resistant alloy with a hardness greater than 54 HRC, good polishability and high bending toughness, essentially containing the elements carbon, silicon, manganese, chromium, molybdenum, vanadium, nitrogen as well as iron and production-related impurities, characterized by a percentage in% by weight
C = 0.40 to 0.85
Si = up to 1.0
Mn = up to 1.4
Cr = 16.0 to 19.0
Mo = 0.8 to 1.5
V = 0.05 to 0.2
Nb = up to 0.15
Ti to 0.18
N = 0.12 to 0.29
with the proviso that the contents
Ni maximum 0.25
Co maximum 0.20
Cu maximum 0.25
Ni + Co + Cu maximum 0.48
amount and the sum of the concentration of carbon dioxide and nitrogen gives a value of at least 0.61, but at most 0.95. Legierung nach Anspruch 1, dadurch gekennzeichnet, daß die Gehalte an in Gew.-%
Ni maximal 0,15
Cu maximal 0,15
Ni + Co + Cu maximal 0,24
betragen.Alloy according to claim 1, characterized in that the contents of in% by weight
Ni maximum 0.15
Cu maximum 0.15
Ni + Co + Cu maximum 0.24
be. Legierung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Summe der Konzentration von Kohlenstoff und Stickstoff einen Wert von mindestens 0,66 und höchstens 0,84 ergibt.Alloy according to one of claims 1 or 2, characterized in that the sum of the concentration of carbon and nitrogen has a value of results in at least 0.66 and at most 0.84. Verfahren zur Herstellung korrosionsbeständiger Schneidwaren mit einer Härte von 54 bis 61 HRC und hoher Biegezähigkeit insbesondere für die Lebensmittelindustrie und für medizinische Instrumente aus einer Legierung enthaltend im wesentlichen die Elemente Kohlenstoff, Silizium, Mangan, Chrom, Molybdän, Vanadin, Stickstoff sowie Eisen und erzeugungsbedingte Verunreinigungen, dadurch gekennzeichnet, daß eine Legierung mit Anteilen von in Gew.-%
C = 0,40 bis 0,84
Si =   bis 1,0
Mn =   bis 1,4
Cr = 16,0 bis 19,0
Mo= 0,8 bis 1,5
V = 0,05 bis 0,2
Nb=   bis 0,15
Ti =   bis 0,18
N = 0,12 bis 0,29
mit der Maßgabe hergestellt wird, daß die Gehalte an
Ni maximal 0,25
Co maximal 0,20
Cu maximal 0,25
Ni +Co +Cu maximal 0,48
betragen und die Summe der Konzentrationen von Kohlenstoff und Stickstoff einen Wert von mindenstens 0,61 und höchstens 0,95 ergibt und der Werkstoff, vorzugsweise während einer Verformung, mindestens einer Lösungsglühbehandlung bei einer Temperatur von höher als 1065 °C unterworfen wird, wonach der aus der Legierung gebildete Teil bzw. das Werkstück, insbesondere die Schneidware im Rohzustand, im Bereich des A3- Punktes der Legierung, vorzugsweise bei einer Temperatur zwischen 800 und 880 °C, weichgeglüht, sodann mit geringer Intensität abgekühlt, danach wieder erwärmt und in einem Temperaturbereich von 940 bis 1060 °C austenitisiert und anschließend mit erhöhter Intensität abgekühlt wird, worauf mindestens eine Anlaßbehandlung bei einer Temperatur zwischen 165 und 385 °C und eine Fertigbearbeitung des Schneidteiles durchgeführt werden.Process for the production of corrosion-resistant cutlery with a hardness of 54 to 61 HRC and high flexural strength, in particular for the food industry and for medical instruments made of an alloy essentially containing the elements carbon, silicon, manganese, chromium, molybdenum, vanadium, nitrogen and iron and impurities caused by production , characterized in that an alloy with fractions of in% by weight
C = 0.40 to 0.84
Si = up to 1.0
Mn = up to 1.4
Cr = 16.0 to 19.0
Mo = 0.8 to 1.5
V = 0.05 to 0.2
Nb = up to 0.15
Ti = up to 0.18
N = 0.12 to 0.29
with the proviso that the contents are
Ni maximum 0.25
Co maximum 0.20
Cu maximum 0.25
Ni + Co + Cu maximum 0.48
amount and the sum of the concentrations of carbon and nitrogen gives a value of at least 0.61 and at most 0.95 and the material, preferably during deformation, is subjected to at least one solution heat treatment at a temperature of higher than 1065 ° C., after which the the part or the workpiece formed in the alloy, in particular the raw cut goods, in the region of the A3 point of the alloy, preferably at a temperature between 800 and 880 ° C., soft-annealed, then cooled with low intensity, then reheated and in a temperature range austenitized from 940 to 1060 ° C and then cooled with increased intensity, whereupon at least one tempering treatment at a temperature between 165 and 385 ° C and a finishing of the Cutting part can be performed. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Legierung mit Gehalten an in Gew.-%
Ni maximal 0,15
Cu maximal 0,15
Ni +Co +Cu maximal 0,24
und/oder einen Summenwert der Konzentration
von C+N von 0,66 bis 0,84 hergestellt wird.A method according to claim 4, characterized in that the alloy with contents of in wt .-%
Ni maximum 0.15
Cu maximum 0.15
Ni + Co + Cu maximum 0.24
and / or a total value of the concentration
from C + N from 0.66 to 0.84. Verfahren nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß die Abkühlung der Teile mit erhöhter Intensität im Quettenverfahren, gegebenenfalls mit Wasser, vorzugweise mit Preßluft, insbesondere mit Öl, durchgeführt wird.Method according to one of claims 4 or 5, characterized in that the cooling of the parts is carried out with increased intensity in the quenching process, optionally with water, preferably with compressed air, in particular with oil. Verfahren nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Austenitisierung der Teile in einem Temperaturbereich zwischen 960 und 1050 °c, vorzugsweise von 980 bis 1030 °C, durchgeführt wird.Method according to one of claims 4 to 6, characterized in that the austenitization of the parts is carried out in a temperature range between 960 and 1050 ° C, preferably from 980 to 1030 ° C. Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, daß nach dem Abkühlen mit erhöhter Intensität von der Austenitisierungstemperatur der Teil einer Tiefkühlbehandlung bei einer Temperatur von unter minus 55 °C, vorzugsweise unter minus 70 °C, unterworfen wird.Method according to one of claims 4 to 7, characterized in that after cooling with increased intensity from the austenitizing temperature, the part is subjected to a deep-freeze treatment at a temperature below minus 55 ° C, preferably below minus 70 ° C.
EP95890122A 1994-06-29 1995-06-28 Corrosion resistant alloy and method for making corrosion resistant cutting tools Expired - Lifetime EP0694622B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT128394 1994-06-29
AT0128394A AT401387B (en) 1994-06-29 1994-06-29 CORROSION RESISTANT ALLOY AND METHOD FOR PRODUCING CORROSION RESISTANT CUTTERS
AT1283/94 1994-06-29

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EP0694622A1 true EP0694622A1 (en) 1996-01-31
EP0694622B1 EP0694622B1 (en) 2001-10-04

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EP (1) EP0694622B1 (en)
AT (2) AT401387B (en)
DE (1) DE59509656D1 (en)
DK (1) DK0694622T3 (en)
ES (1) ES2164142T3 (en)
FI (1) FI111273B (en)
NO (1) NO309045B1 (en)

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Publication number Priority date Publication date Assignee Title
EP0710731A3 (en) * 1994-11-04 1996-11-27 Boehler Edelstahl Use of a nitrogen-containing iron base alloy for machine members that are subjected to sliding surface friction
ES2130065A1 (en) * 1997-03-17 1999-06-16 Gsb Grupo Siderurgico S A Process for the manufacture of microalloy steels having acicular ferrite structures cooled by conventional means
WO2001053555A1 (en) * 2000-01-17 2001-07-26 Stahlwerk Ergste Westig Gmbh Chrome steel alloy
WO2011023326A1 (en) * 2009-08-24 2011-03-03 Stahlwerk Ergste Westig Gmbh Stainless martensitic chromium steel
WO2012113569A1 (en) * 2011-02-24 2012-08-30 Stahlwerk Ergste Westig Gmbh Use of a chromium steel having a martensitic microstructure and carbidic inclusions

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0710731A3 (en) * 1994-11-04 1996-11-27 Boehler Edelstahl Use of a nitrogen-containing iron base alloy for machine members that are subjected to sliding surface friction
ES2130065A1 (en) * 1997-03-17 1999-06-16 Gsb Grupo Siderurgico S A Process for the manufacture of microalloy steels having acicular ferrite structures cooled by conventional means
WO2001053555A1 (en) * 2000-01-17 2001-07-26 Stahlwerk Ergste Westig Gmbh Chrome steel alloy
GB2374605A (en) * 2000-01-17 2002-10-23 Stahlwerk Ergste Westig Gmbh Chrome steel alloy
GB2374605B (en) * 2000-01-17 2004-02-25 Stahlwerk Ergste Westig Gmbh Chrome steel alloy
US6770243B2 (en) 2000-01-17 2004-08-03 Stahlwerk Ergste Westig Gmbh Chrome steel alloy
CZ297208B6 (en) * 2000-01-17 2006-10-11 Stahlwerk Ergste Westig Gmbh Chrome-steel alloy
WO2011023326A1 (en) * 2009-08-24 2011-03-03 Stahlwerk Ergste Westig Gmbh Stainless martensitic chromium steel
WO2012113569A1 (en) * 2011-02-24 2012-08-30 Stahlwerk Ergste Westig Gmbh Use of a chromium steel having a martensitic microstructure and carbidic inclusions

Also Published As

Publication number Publication date
ATA128394A (en) 1996-01-15
DK0694622T3 (en) 2002-01-21
ATE206477T1 (en) 2001-10-15
FI111273B (en) 2003-06-30
FI953218A0 (en) 1995-06-29
NO952557D0 (en) 1995-06-26
ES2164142T3 (en) 2002-02-16
NO952557L (en) 1996-01-02
NO309045B1 (en) 2000-12-04
EP0694622B1 (en) 2001-10-04
AT401387B (en) 1996-08-26
FI953218A (en) 1995-12-30
DE59509656D1 (en) 2001-11-08

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