EP0963453A1 - Alliage a base de cobalt austenitique exempt de nickel - Google Patents

Alliage a base de cobalt austenitique exempt de nickel

Info

Publication number
EP0963453A1
EP0963453A1 EP98909320A EP98909320A EP0963453A1 EP 0963453 A1 EP0963453 A1 EP 0963453A1 EP 98909320 A EP98909320 A EP 98909320A EP 98909320 A EP98909320 A EP 98909320A EP 0963453 A1 EP0963453 A1 EP 0963453A1
Authority
EP
European Patent Office
Prior art keywords
nickel
cobalt
alloy
molybdenum
titanium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98909320A
Other languages
German (de)
English (en)
Inventor
Gernot Hausch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Vacuumschmelze GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vacuumschmelze GmbH and Co KG filed Critical Vacuumschmelze GmbH and Co KG
Publication of EP0963453A1 publication Critical patent/EP0963453A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt

Definitions

  • the invention relates to a nickel-free, austenitic cobalt-based alloy with high corrosion resistance and good formability.
  • Austenitic stainless steels are normally used for everyday consumer goods, which require, among other things, corrosion resistance, good formability and non-magnetizability. These steels are alloys that contain chromium, nickel and molybdenum as the main constituent.
  • Austenitic cobalt-based alloys are used to meet the highest demands on corrosion resistance. As these alloys all contain nickel, there is a risk of a so-called nickel allergy if the consumer goods made from them come into contact with the skin. In particular, there is a risk of nickel allergy in the case of eyeglass frames, ear plugs, wristwatches and medical implants.
  • Nickel-free iron-based austenitic alloys are known. For example, there are nickel-free, nitrogen-alloyed steels based on iron-manganese-chromium (molybdenum) with 0.5 to 1.5% by weight nitrogen, the high nitrogen content being introduced by nitrogen under pressure. These alloys are described in detail in Results of Materials Research, Volume 4, Thubal-Kain, 1991, for example. Another 1.4456 (Fe-18Cr-18Mn-2Mo-0, 9N) is a representative of these nickel-free nitrogen-alloyed steels. The manganese content has no austenitic stabilizing effect here, but only serves to increase nitrogen solubility.
  • the high manganese content has a negative effect on the corrosion resistance.
  • the nitrogen alloy steel 1.4456 also does not have satisfactory corrosion resistance.
  • This alloy has excellent corrosion resistance and good formability and is non-magnetic. Furthermore, it can be easily cast into complicated shapes and, if necessary, further processed.
  • the object of the invention is achieved in provided that it is surprising that it has been found that this alloy is in principle a cobalt-chromium-molybdenum-nickel alloy in which the nickel, which essentially brings about the austenite stability, can be replaced by iron and titanium and / or niobium. This is surprising insofar as titanium shows an austenite-destabilizing effect in places with niobium.
  • cobalt-chromium-molybdenum-titanium alloys have long been known.
  • the alloy "Dentitan" with 24% by weight chromium, 4% by weight molybdenum, 2.5% by weight titanium, the rest cobalt is used as a casting alloy in dental technology.
  • these alloys lack the iron content of the alloy according to the invention and thus the austenite stability required for good cold formability.
  • the alloying elements must be suitably matched for the intended purpose as wrought alloy. It was found that the chromium + molybdenum + X A tungsten + titanium / niobium content may not exceed 28% by weight, the titanium / niobium content being in the range from 4 to 6% by weight, the content of chromium in the range 10 to 20 wt .-%, the content of molybdenum + x ⁇ tungsten must be in the range 4 to 8 wt .-%.
  • chromium and molybdenum / tungsten are necessary in order to achieve a high level of corrosion resistance, while the stated contents of titanium or niobium are the setting of a single-phase austenitic structure. The desired good cold and hot formability is only guaranteed in this structural state.
  • the structure of the alloy obtained is mostly hexagonal and the good cold formability is no longer given.
  • the alloys thus obtained are ductile, have excellent corrosion 'sbestieri- ness against tissue and body fluids and can be easily cast into complex shapes and further processed, such as eyeglass frames, so that this alloy in addition to the use as a material in the jewelry and the eyewear industry is also particularly suitable as a material for dental prostheses and general surgical implants.
  • a hardness in the 75% cold worked condition 490 HV tensile strength 75% cold worked: 1900 MPa yield strength 75% cold worked: 1370 MPas elongation 75% cold worked: 1.5%

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials For Medical Uses (AREA)

Abstract

L'invention concerne un alliage à base de cobalt austénitique, exempt de nickel, résistant à la corrosion et d'une bonne aptitude au formage. L'alliage selon l'invention est constitué de: 10-18 % de chrome; 4-6 % (de titane et/ou de niobium); 0-3 % de manganèse; 0-3 % d'aluminium; 0-2 % de cuivre; 4-8 % (de molybdène + 1/2 de tungstène); 5-20 % de fer; 0-1 % de silicium; 0-0,1 % (de carbone + azote); cobalt résiduel et impuretés résultant de la production. Ll'alliage selon l'invention est en outre remarquablement apte au formage à froid et peut être durci par revenu.
EP98909320A 1997-02-06 1998-02-03 Alliage a base de cobalt austenitique exempt de nickel Withdrawn EP0963453A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1997104530 DE19704530C2 (de) 1997-02-06 1997-02-06 Verwendung einer nickelfreien, austenitischen Kobaltbasislegierung
DE19704530 1997-02-06
PCT/DE1998/000296 WO1998035067A1 (fr) 1997-02-06 1998-02-03 Alliage a base de cobalt austenitique exempt de nickel

Publications (1)

Publication Number Publication Date
EP0963453A1 true EP0963453A1 (fr) 1999-12-15

Family

ID=7819512

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98909320A Withdrawn EP0963453A1 (fr) 1997-02-06 1998-02-03 Alliage a base de cobalt austenitique exempt de nickel

Country Status (4)

Country Link
EP (1) EP0963453A1 (fr)
JP (1) JP2001512529A (fr)
DE (1) DE19704530C2 (fr)
WO (1) WO1998035067A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7794493B2 (en) * 2004-06-30 2010-09-14 Cordis Corporation Magnetic resonance imaging compatibility alloy for implantable medical devices
WO2006054358A1 (fr) * 2004-11-19 2006-05-26 Iwate University PROCÉDÉ SERVANT À RENDRE NON NOCIVE UNE TOXICITÉ ALLERGIQUE DÉRIVÉE D'UNE IMPURETÉ SOUS FORME DE TRACES DE Ni DANS UN BIO-ALLIAGE
JP5239005B2 (ja) * 2004-11-19 2013-07-17 国立大学法人岩手大学 組織制御によってイオン溶出を抑えた生体用Ｃｏ−Ｃｒ−Ｍｏ合金及びその製造法
DE102008002471A1 (de) 2008-06-17 2009-12-24 Biotronik Vi Patent Ag Stent mit einer Beschichtung oder einem Grundkörper, der ein Lithiumsalz enthält, und Verwendung von Lithiumsalzen zur Restenoseprophylaxe
EP2676684B1 (fr) 2012-06-18 2015-01-07 Biotronik AG Alliage de cobalt pour des implants médicaux et stent constitué de l'alliage
EP2676686B1 (fr) 2012-06-18 2015-04-08 Biotronik AG Stent en alliage de cobalt
EP2757423B1 (fr) 2013-01-17 2018-07-11 Omega SA Pièce pour mouvement d'horlogerie
SI3202427T1 (sl) * 2016-02-03 2019-08-30 Deutsche Edelstahlwerke Specialty Steel Gmbh & Co. Kg Uporaba biokompatibilne zlitine na osnovi kobalta, strjene z obarjanjem ali ojačene s tvorjenjem mešanih kristalov, ter postopek za izdelavo implantatov ali protez z obdelavo z odstranjevanjem materiala

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3319457C1 (de) * 1983-05-28 1984-02-09 Degussa Ag, 6000 Frankfurt Kobaltlegierungen zur Herstellung von Zahnersatz
US4755240A (en) * 1986-05-12 1988-07-05 Exxon Production Research Company Nickel base precipitation hardened alloys having improved resistance stress corrosion cracking
DE3624377A1 (de) * 1986-07-18 1988-01-28 Vacuumschmelze Gmbh Verwendung einer korrosionsbestaendigen, nickelfreien kobalt-chrom-legierung
JPH07216484A (ja) * 1994-02-01 1995-08-15 Ohara:Kk 歯科用合金材料及びそのインゴット製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9835067A1 *

Also Published As

Publication number Publication date
WO1998035067A1 (fr) 1998-08-13
DE19704530C2 (de) 1999-02-25
DE19704530A1 (de) 1998-08-13
JP2001512529A (ja) 2001-08-21

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