EP1785500A1 - A wear and corrosion resistant highly alloyed steel powder - Google Patents

A wear and corrosion resistant highly alloyed steel powder Download PDF

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EP1785500A1
EP1785500A1 EP06405384A EP06405384A EP1785500A1 EP 1785500 A1 EP1785500 A1 EP 1785500A1 EP 06405384 A EP06405384 A EP 06405384A EP 06405384 A EP06405384 A EP 06405384A EP 1785500 A1 EP1785500 A1 EP 1785500A1
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Prior art keywords
steel according
hardness
steel
weight
wear
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German (de)
French (fr)
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EP1785500B1 (en
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Beat Hofer
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Kennametal HTM AG
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Sintec HTM AG
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • 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
    • C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps

Definitions

  • the present invention relates to a steel alloy according to the preamble of claim 1. Furthermore, the invention relates to a method for producing the steel.
  • Powder metallurgy allows the assembly of alloying elements without segregation. Due to the alloying of the individual elements in the melt and subsequent gas atomization by nitrogen, the alloy content in the melt hardly changes to the atomizing powder.
  • Such produced powder is then filled into a capsule and hot isostatically compressed.
  • the selected HIP temperature is below the melting temperature of the powder so that segregation or segregation during the sintering process is precluded.
  • oxides and mineral substances are introduced into the material. These can amount to 95% of the volume.
  • the worm housing and the worm are subjected to a great deal of corrosion and abrasion. Therefore, the use of special steels is required, which meet the requirements for wear, corrosion and strength.
  • a powder metallurgy steel is presented, which meets the requirements for wear and corrosion very well, even if it has a lower toughness through the use of the high alloy content of the elements C, Cr, V and W.
  • the alloys used in the US 4765836 have the following proportions of the main components in addition to iron: C Cr W Not a word V Ni Mn Min [%] 2.50 15.00 0 2.0 6.00 0 0.2 Max [%] 5.00 30.00 0 10.00 11.00 0.5 1
  • the alloys may still contain small amounts of sulfur, silicon and nitrogen.
  • the carbon content is adjusted with respect to V, Mo and Cr to form carbides and ensure a martensite structure by excess carbon.
  • An object of the present invention is to provide an alloy which better meets the requirements for extruder parts.
  • these alloys have a basic hardness of at least 50 HRC.
  • the basic hardness is the hardness after production by hot isostatic pressing (HIP) and soft annealing.
  • the alloy is melted and then gas atomized.
  • the solidified powder is subsequently filled into a capsule, and the capsule was evacuated and sealed gas-tight.
  • a subsequent HIP treatment preferably at 1100 ° C / 3h / 1100 bar, gives a fine, segregation-free structure.
  • the carbides are evenly distributed in the basic matrix.
  • the material can be directly annealed as desired in the HIP plant or annealed by a subsequent heat treatment at 900-920 ° C, holding for 2 h and uniform cooling at 12 ° C per hour to 600 ° C.
  • the soft annealing hardness (basic hardness) reached is approx. 52 HRC.
  • the material (“Veko 25CR”) is then heat treated and tempered.
  • the achieved hardness values are shown in the start diagram [Fig. 1] recorded relative to the different hardening temperatures. Material from various heat treatment stages was then tested for bending and compression strength. As an example of a hardening temperature 1140 ° C and tempering temperature 450 ° C, the hardness and compressive strength in [Fig. 2] and compared the results with other PM materials.
  • the material X 245 has the highest compressive strength, but a lower hardness than VeKo 25Cr.
  • the ductility of Veko 25Cr is therefore not dependent on hardness.
  • the flexural strength also a measure of the brittleness, is considerably higher than for other hard materials with lower hardness. Only the material X 245 has a higher bending strength, but at a lower hardness. Subsequently, these samples were subjected to wear and corrosion tests and the results were compared with other corrosion-resistant materials.
  • the parameters of the hot isostatic pressing can also be chosen differently than proposed within the usual values.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

A type of steel alloy is mixed in powder form of composition (%): 3.4-4.2 carbon; 20-30 chromium; 3-10 tungsten; 0-4 molybdenum; 0-6 nickel; 0.6-1.0 silicon; 0.2-0.4 manganese; 4.75-5.25 vanadium; 0.75-1.25 niobium; and balance iron and impurities. The steel in solid form is formed in a capsule by hot isostatic pressure of the powder in this composition.

Description

Die vorliegende Erfindung bezieht sich auf eine Stahllegierung gemäss Oberbegriff des Anspruchs 1. Weiterhin betrifft die Erfindung ein Verfahren zur Herstellung des Stahls.The present invention relates to a steel alloy according to the preamble of claim 1. Furthermore, the invention relates to a method for producing the steel.

Die Pulvermetallurgie erlaubt die Zusammenstellung von Legierungselementen ohne Entmischung. Durch das Legieren der einzelnen Elemente in der Schmelze und anschliessende Gasverdüsung durch Stickstoff ändert sich der Legierungsanteil in der Schmelze zum verdüsenden Pulver kaum.Powder metallurgy allows the assembly of alloying elements without segregation. Due to the alloying of the individual elements in the melt and subsequent gas atomization by nitrogen, the alloy content in the melt hardly changes to the atomizing powder.

Derartig hergestelltes Pulver wird anschliessend in eine Kapsel gefüllt und heissisostatisch verdichtet. Die gewählte HIP-Temperatur liegt unter der Schmelztemperatur des Pulvers, so dass eine Entmischung oder eine Seigerung während des Sintervorgangs ausgeschlossen ist.Such produced powder is then filled into a capsule and hot isostatically compressed. The selected HIP temperature is below the melting temperature of the powder so that segregation or segregation during the sintering process is precluded.

Bei der Herstellung von temperatur- und festigkeitsbeständigen Kunststoffen werden Oxide und mineralische Stoffe in das Material eingebracht. Diese können bis 95 % des Volumens betragen. Beim Mischvorgang im Extruder wird das Schneckengehäuse und die Schnecke sehr stark bezüglich Korrosion und Abrasion beansprucht. Deswegen wird der Einsatz von speziellen Stählen verlangt, die die Anforderungen bezüglich Verschleiss, Korrosion und Festigkeit erfüllen. Mit der vorliegenden Erfindung wird ein pulvermetallurgischer Stahl vorgestellt, der die Anforderungen bezüglich Verschleiss und Korrosion sehr gut abdeckt, auch wenn er eine geringere Zähigkeit durch den Einsatz des hohen Legierungsanteil der Elemente C, Cr, V und W aufweist.In the production of temperature and strength-resistant plastics, oxides and mineral substances are introduced into the material. These can amount to 95% of the volume. During the mixing process in the extruder, the worm housing and the worm are subjected to a great deal of corrosion and abrasion. Therefore, the use of special steels is required, which meet the requirements for wear, corrosion and strength. With the present invention, a powder metallurgy steel is presented, which meets the requirements for wear and corrosion very well, even if it has a lower toughness through the use of the high alloy content of the elements C, Cr, V and W.

Im Patent US 4765836 ist eine Legierung beschrieben, die eine ähnliche Zusammensetzung wie die erfindungsgemässe Legierung, aber einen höheren Vanadiumgehalt aufweist und kein Wolfram enthält.In the patent US 4765836 An alloy is described which has a composition similar to that of the alloy according to the invention but a higher vanadium content and contains no tungsten.

Die Legierungen, die in der US-4765836 beansprucht werden, weisen folgende Anteile der Hauptkomponenten neben Eisen auf: C Cr W Mo V Ni Mn Min [%] 2,50 15,00 0 2,0 6,00 0 0,2 Max [%] 5,00 30,00 0 10,00 11,00 0,5 1 The alloys used in the US 4765836 are claimed, have the following proportions of the main components in addition to iron: C Cr W Not a word V Ni Mn Min [%] 2.50 15.00 0 2.0 6.00 0 0.2 Max [%] 5.00 30.00 0 10.00 11.00 0.5 1

Daneben können die Legierungen noch geringe Anteile Schwefel, Silizium und Stickstoff enthalten. Der Kohlenstoffgehalt ist bezüglich V, Mo und Cr angepasst, um Karbide zu bilden und durch einen Kohlenstoffüberschuss eine Martensitstruktur sicherzustellen.In addition, the alloys may still contain small amounts of sulfur, silicon and nitrogen. The carbon content is adjusted with respect to V, Mo and Cr to form carbides and ensure a martensite structure by excess carbon.

Ein ähnlicher Weg wird im Patent EP0271238 B1 vorgeschlagen, dabei wird aber ein Molybdängehalt von 2 - 10 % angegeben und ein Vanadiumgehalt von 6 - 11 %. Hier ist der hohe Vanadiumanteil verschleissfestigkeitsbestimmend wie ebenso der hohe Molybdängehalt. Wolfram und Niob als Karbidbildner werden als 0 % angegeben.A similar way is in the patent EP0271238 B1 proposed, but a molybdenum content of 2-10% is specified and a vanadium content of 6 - 11%. Here, the high proportion of vanadium determines the resistance to wear, as does the high molybdenum content. Tungsten and niobium carbide formers are reported as 0%.

Eine Aufgabe vorliegender Erfindung besteht darin, eine Legierung anzugeben, die den Anforderungen für Extruderteile besser entspricht.An object of the present invention is to provide an alloy which better meets the requirements for extruder parts.

Eine derartige Legierung ist in Anspruch 1 angegeben, die weiteren Ansprüche geben bevorzugte Ausführungsformen und Herstellungsverfahren der Legierung an.Such an alloy is specified in claim 1, the further claims indicate preferred embodiments and methods of preparation of the alloy.

Prozentangaben sind in der Beschreibung und den Ansprüchen Gewichtsprozente, soweit nicht anders angegeben.Percentages are by weight in the specification and claims, unless otherwise specified.

Allgemein wurde mit Legierungen der ZusammensetzungGeneral was using alloys of the composition

Komponente Anteil [%] C 3,4 - 4,2 Cr 20 - 30 W 3 - 10 Mo 0 - 4 Ni 0 - 6 Si 0,6 - 1,0 Mn 0,2 - 0,4 V 4,75 - 5,25 Nb 0,75 - 1,25 Rest: Eisen und Verunreinigungen die geforderten verbesserten Eigenschaften erzielt. Insbesondere weisen diese Legierungen eine Grundhärte von mindestens 50 HRC auf. Die Grundhärte ist dabei die Härte nach der Herstellung durch heissisostatischen Pressen (HIP) und Weichglühen. component Proportion of [%] C 3,4 - 4,2 Cr 20 - 30 W 3 - 10 Not a word 0 - 4 Ni 0 - 6 Si 0.6 - 1.0 Mn 0.2-0.4 V 4.75 - 5.25 Nb 0.75 - 1.25 Rest: Iron and impurities achieved the required improved properties. In particular, these alloys have a basic hardness of at least 50 HRC. The basic hardness is the hardness after production by hot isostatic pressing (HIP) and soft annealing.

Die Erfindung wird weiter an bevorzugten Ausführungsformen mit Bezugnahme auf Figuren erläutert.

Fig. 1
Anlassdiagramm einer erfindungsgemässen Legierung
Fig. 2
Härte- und Druckfestigkeitsdiagramm der Legierung im Vergleich mit anderen Legierungen
Fig. 3
Vergleichsdiagramm Biegefestigkeit
Fig. 4
Vergleichsdiagramm Verschleissfestigkeit
Fig. 5
Vergleichsdiagramm Korrosionsbeständigkeit
The invention will be further elucidated on preferred embodiments with reference to figures.
Fig. 1
Starting Diagram of an alloy according to the invention
Fig. 2
Hardness and compressive strength diagram of the alloy compared to other alloys
Fig. 3
Comparison diagram bending strength
Fig. 4
Comparison diagram wear resistance
Fig. 5
Comparative chart corrosion resistance

Es wird eine Legierung mit einer Analyse von vorzugsweise C = 3,75 % / Si = 0,8 % / Mn = 0,3 % / Cr = 25 % / Mo = 3 % / V = 5 % / W = 5 % / Nb = 1 % / Ni = 2 % wie folgt hergestellt:An alloy with an analysis of preferably C = 3.75% / Si = 0.8% / Mn = 0.3% / Cr = 25% / Mo = 3% / V = 5% / W = 5% / Nb = 1% / Ni = 2% prepared as follows:

Die Legierung wird erschmolzen und anschliessend gasverdüst. Das erstarrte Pulver wird nachher in eine Kapsel gefüllt, und die Kapsel wurde evakuiert und gasdicht verschlossen.The alloy is melted and then gas atomized. The solidified powder is subsequently filled into a capsule, and the capsule was evacuated and sealed gas-tight.

Eine anschliessende HIP-Behandlung, vorzugsweise bei 1100 °C / 3h / 1100 bar, ergibt ein feines, seigerungsfreies Gefüge. Die Karbide sind gleichmässig in der Grundmatrix verteilt. Das Material kann je nach Wunsch in der HIP-Anlage direkt weichgeglüht oder durch eine anschliessende Wärmebehandlung bei 900-920 °C, Halten 2 h und gleichmässiges Abkühlen mit 12 °C pro Stunde bis 600 °C weichgeglüht werden.A subsequent HIP treatment, preferably at 1100 ° C / 3h / 1100 bar, gives a fine, segregation-free structure. The carbides are evenly distributed in the basic matrix. The material can be directly annealed as desired in the HIP plant or annealed by a subsequent heat treatment at 900-920 ° C, holding for 2 h and uniform cooling at 12 ° C per hour to 600 ° C.

Die erreichte Weichglühhärte (Grundhärte) liegt bei ca. 52 HRC. Das Material ("Veko 25CR") wird anschliessend wärmebehandelt und angelassen. Die erreichten Härtewerte sind im Anlassdiagramm [Fig. 1] bezogen auf die verschiedenen Härtetemperaturen aufgezeichnet. Material aus den verschiedensten Wärmebehandlungsstufen wurde anschliessend auf die Biege- und Druckfestigkeit geprüft. Als Beispiel für eine Härtetemperatur 1140 °C und Anlasstemperatur 450 °C sind die Härte und Druckfestigkeit im [Fig. 2] aufgezeichnet und die Resultate mit anderen PM-Werkstoffen verglichen. Diese bekannten Vergleichslegierungen sind spezifiziert wie folgt: Tabelle 1: Legierungszusammensetzungen (PM: pulvermetallurgisch) Name C Si Mn Cr Cu Ti Ni W Mo Co V Nb B Fe Herstellgs.-verfahren X 235 2.5 0.5 0.3 20.0 0.0 0.0 < 0.5 0.0 1.3 0.0 4.3 1.9 Rest PM X 245 2.5 0.9 0.5 5.3 0.0 0.0 < 0.5 0.0 1.3 0.0 9.8 0.0 Rest PM X 260 Cr 2.7 0.6 0.4 26.0 0.0 0.0 < 0.5 0.0 1.1 0.0 2.4 1.3 Rest PM GP 27.1 2.7 0.6 0.4 26.0 0.0 0.0 < 0.5 0.0 1.1 0.0 2.4 1.3 Rest Guss Mit HIP hergestellte Legierungen: HIP 40 S 0,2 3,5 <0.1 7,5 - - Rest - - - - - 2.8 <1,0 PM HIP 65S 1,15 4,3 - 17 - - Rest - - - - - 3,3 <1,0 PM HIP 1 2.5 - - 33 - - - 13 - Rest - - - - PM HIP 1 Mo 2.5 - - 33 - - - 13 4 Rest - - - - PM The soft annealing hardness (basic hardness) reached is approx. 52 HRC. The material ("Veko 25CR") is then heat treated and tempered. The achieved hardness values are shown in the start diagram [Fig. 1] recorded relative to the different hardening temperatures. Material from various heat treatment stages was then tested for bending and compression strength. As an example of a hardening temperature 1140 ° C and tempering temperature 450 ° C, the hardness and compressive strength in [Fig. 2] and compared the results with other PM materials. These known comparative alloys are specified as follows: <b> Table 1: Alloy compositions (PM: powder metallurgical) </ b> Surname C Si Mn Cr Cu Ti Ni W Not a word Co V Nb B Fe Herstellgs.-process X 235 2.5 0.5 0.3 20.0 0.0 0.0 <0.5 0.0 1.3 0.0 4.3 1.9 rest PM X 245 2.5 0.9 0.5 5.3 0.0 0.0 <0.5 0.0 1.3 0.0 9.8 0.0 rest PM X 260 cr 2.7 0.6 0.4 26.0 0.0 0.0 <0.5 0.0 1.1 0.0 2.4 1.3 rest PM GP 27.1 2.7 0.6 0.4 26.0 0.0 0.0 <0.5 0.0 1.1 0.0 2.4 1.3 rest molding Alloys made with HIP: HIP 40S 0.2 3.5 <0.1 7.5 - - rest - - - - - 2.8 <1.0 PM HIP 65S 1.15 4.3 - 17 - - rest - - - - - 3.3 <1.0 PM HIP 1 2.5 - - 33 - - - 13 - rest - - - - PM HIP 1 mo 2.5 - - 33 - - - 13 4 rest - - - - PM

Dabei zeigt sich, dass der neue Werkstoff VeKo 25Cr trotz der hohen Härte im Vergleich mit anderen Werkstoffen eine gute Druckfestigkeit besitzt. Der Werkstoff X 245 hat die höchste Druckfestigkeit, aber eine tiefere Härte als VeKo 25Cr. Die Duktilität von Veko 25Cr ist also nicht härteabhängig.It shows that the new VeKo 25Cr material, despite its high hardness, has good compressive strength compared to other materials. The material X 245 has the highest compressive strength, but a lower hardness than VeKo 25Cr. The ductility of Veko 25Cr is therefore not dependent on hardness.

Das Gleiche zeigt sich in der Biegefestigkeit (Fig. 3). Die Biegefestigkeit, auch ein Mass für die Sprödigkeit, ist wesentlich höher als für andere Hartstoffe mit tieferer Härte. Einzig der Werkstoff X 245 hat eine höhere Biegefestigkeit, allerdings bei einer tieferen Härte. Anschliessend wurden von diesen Proben Verschleiss- und Korrosionsversuche durchgeführt und die Ergebnisse mit anderen korrosionsfesten Werkstoffen verglichen.The same can be seen in the bending strength (FIG. 3). The flexural strength, also a measure of the brittleness, is considerably higher than for other hard materials with lower hardness. Only the material X 245 has a higher bending strength, but at a lower hardness. Subsequently, these samples were subjected to wear and corrosion tests and the results were compared with other corrosion-resistant materials.

Dabei stellte sich heraus, dass der neue pulvermetallurgische Werkstoff Veko 25Cr im Vergleich zu anderen PM-Werkstoffen gute Verschleiss- [Fig. 4] und Korrosionseigenschaften [Fig. 5] aufweist.It turned out that the new powder metallurgical material Veko 25Cr has good wear compared to other PM materials [Fig. 4] and corrosion properties [Fig. 5].

Diese besonderen Eigenschaften werden erreicht, indem der Vanadiumgehalt bewusst tief eingestellt wird, dafür aber eine Beigabe von Wolfram zur Beeinflussung der Karbidhärte beigegeben wird. Die Zugabe von Nickel beinflusst den Austenitgehalt und erhöht dadurch die Korrosionsbeständigkeit.These special properties are achieved by deliberately setting the vanadium content low, but adding tungsten to influence the carbide hardness. The addition of nickel influences the austenite content and thereby increases the corrosion resistance.

Aus der vorangehenden Beschreibung sind für den Fachmann Abwandlungen der Erfindung zugänglich, ohne den Schutzbereich zu verlassen, der durch die Ansprüche definiert ist.From the foregoing description, modifications of the invention will be apparent to those skilled in the art without departing from the scope of protection defined by the claims.

Insbesondere können die Parameter des heissisostatischen Pressens im Rahmen der üblichen Werte auch anders gewählt werden als vorgeschlagen.In particular, the parameters of the hot isostatic pressing can also be chosen differently than proposed within the usual values.

Glossarglossary

HIPHIP
Heissisostatisches PressenHot isostatic pressing
HRCHRC
Härtegrad RockwellHardness Rockwell
Veko 25CrVeko 25Cr
Bezeichnung eines bevorzugten erfindungsgemässen MaterialsDesignation of a preferred material according to the invention

Claims (12)

Pulvermetallurgischer Stahl, gekennzeichnet durch die Zusammensetzung in Gewichtsprozent C 3,4 - 4,2 %, Cr 20 - 30 %, W 3 - 10 %, Mo 0 - 4 %, Ni 0 - 6 %, Si 0,6 - 1,0 %, Mn 0,2 - 0,4 %, V 4,75 - 5,25 %, Nb 0,75 - 1,25 %, Rest Fe und Verunreinigungen.Powder metallurgical steel, characterized by the composition in weight percent C 3.4-4.2%, Cr 20-30%, W 3-10%, Mo 0-4%, Ni 0-6%, Si 0.6-1, 0%, Mn 0.2-0.4%, V 4.75-5.25%, Nb 0.75-1.25%, remainder Fe and impurities. Stahl gemäss Anspruch 1, gekennzeichnet durch die folgenden Anteile der angegebenen Komponenten in Gewichtsprozent: C 3,65 - 3,85 %, Cr 24,5 - 25,5 %, W 4,5 - 5,5 %, Mo 2,8 - 3,2 %, Ni 0,4 - 2 %.Steel according to claim 1, characterized by the following proportions of the specified components in percent by weight: C 3.65-3.85%, Cr 24.5-25.5%, W 4.5-5.5%, Mo 2.8 - 3.2%, Ni 0.4 - 2%. Stahl gemäss Anspruch 2, gekennzeichnet durch einen Anteil an Nickel von 2 Gewichtsprozent.Steel according to claim 2, characterized by a nickel content of 2% by weight. Stahl gemäss einem der Ansprüche 1 bis 3, gekennzeichnet durch die folgenden Anteile der angegebenen Bestandteile in Gewichtsprozent: Si 0,8 %, Mn 0,3 %, V 5 %, Nb 1 %.Steel according to one of claims 1 to 3, characterized by the following proportions of the stated constituents in percent by weight: Si 0.8%, Mn 0.3%, V 5%, Nb 1%. Stahl gemäss Anspruch 4, gekennzeichnet durch die folgenden Anteile der angegebenen Bestandteile in Gewichtsprozent: C 3,75 %, Cr 25 %, Mo 3 %, W 5 %, Ni 2 %.Steel according to claim 4, characterized by the following proportions of the stated constituents in percent by weight: C 3.75%, Cr 25%, Mo 3%, W 5%, Ni 2%. Stahl gemäss einem der Ansprüche 1 oder 5, gekennzeichnet durch eine Härte nach Weichglühen (Grundhärte) von mindestens 50 HRC (Härte Rockwell).Steel according to one of claims 1 or 5, characterized by a hardness after annealing (basic hardness) of at least 50 HRC (hardness Rockwell). Stahl gemäss einem der Ansprüche 1 bis 6, gekennzeichnet durch eine Härte von mind. 67 HRC nach einer Wärmebehandlung.Steel according to one of claims 1 to 6, characterized by a hardness of at least 67 HRC after a heat treatment. Stahl gemäss einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass er durch heissisostatisches Pressen herstellbar ist.Steel according to one of claims 1 to 7, characterized in that it can be produced by hot isostatic pressing. Verfahren zur Herstellung eines Körpers aus einem Stahl gemäss einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass ein Gemisch der Komponenten geschmolzen wird, die Schmelze gasverdüst wird und das erhaltene Pulver heissisostatisch gepresst wird.A process for producing a body from a steel according to any one of claims 1 to 8, characterized in that a mixture of the components is melted, the melt is gas atomized and the resulting powder is hot isostatically pressed. Verfahren gemäss Anspruch 9, dadurch gekennzeichnet, dass der Körper aus dem Stahl einer Wärmebehandlung unterworfen wird, um die Härte zu erhöhen.A method according to claim 9, characterized in that the body of the steel is subjected to a heat treatment in order to increase the hardness. Verwendung des Stahls gemäss einem der Ansprüche 1 bis 8 zur Herstellung von Extruderbestandteilen, insbesondere des Schneckengehäuses und der Schnecke.Use of the steel according to one of claims 1 to 8 for the production of extruder components, in particular of the screw housing and the screw. Extruder mit einem Schneckengehäuse und/oder einer Schnecke, die wenigstens an den mit dem Arbeitsmedium in Kontakt tretenden Flächen aus einem Stahl gemäss einem der Ansprüche 1 bis 8 besteht.Extruder with a screw housing and / or a screw, which consists of a steel according to one of claims 1 to 8 at least on the surfaces in contact with the working fluid.
EP06405384A 2005-11-10 2006-09-06 A wear and corrosion resistant highly alloyed steel powder Not-in-force EP1785500B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013148674A3 (en) * 2012-03-27 2013-11-28 Stoody Company Abrasion and corrosion resistant alloy and hardfacing/cladding applications

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271238A2 (en) * 1986-12-11 1988-06-15 Crucible Materials Corporation Wear and corrosion resistant alloy articles
EP0371760A1 (en) * 1988-11-28 1990-06-06 NIPPON PISTON RING CO., Ltd. High strength high chromium cast iron and valve rocker arm made thereof
US20030024614A1 (en) * 2000-03-15 2003-02-06 Jan-Ake Gaven Refining element for a refining disc

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271238A2 (en) * 1986-12-11 1988-06-15 Crucible Materials Corporation Wear and corrosion resistant alloy articles
US4765836A (en) * 1986-12-11 1988-08-23 Crucible Materials Corporation Wear and corrosion resistant articles made from pm alloyed irons
EP0371760A1 (en) * 1988-11-28 1990-06-06 NIPPON PISTON RING CO., Ltd. High strength high chromium cast iron and valve rocker arm made thereof
US20030024614A1 (en) * 2000-03-15 2003-02-06 Jan-Ake Gaven Refining element for a refining disc

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013148674A3 (en) * 2012-03-27 2013-11-28 Stoody Company Abrasion and corrosion resistant alloy and hardfacing/cladding applications
US8765052B2 (en) 2012-03-27 2014-07-01 Stoody Company Abrasion and corrosion resistant alloy and hardfacing/cladding applications
EP2910663A1 (en) * 2012-03-27 2015-08-26 Stoody Company Abrasion and corrosion resistant alloy and hardfacing/cladding applications

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PT1785500E (en) 2008-09-15
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DE502006000902D1 (en) 2008-07-24
ES2309935T3 (en) 2008-12-16

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