EP4271847A1 - Copper-tin continuous casting alloy - Google Patents

Copper-tin continuous casting alloy

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Publication number
EP4271847A1
EP4271847A1 EP22724659.2A EP22724659A EP4271847A1 EP 4271847 A1 EP4271847 A1 EP 4271847A1 EP 22724659 A EP22724659 A EP 22724659A EP 4271847 A1 EP4271847 A1 EP 4271847A1
Authority
EP
European Patent Office
Prior art keywords
weight
tin
copper
continuously cast
zinc
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.)
Pending
Application number
EP22724659.2A
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German (de)
French (fr)
Inventor
Abram TAMMEN
Niklas TAMMEN
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.)
KS Gleitlager GmbH
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KS Gleitlager GmbH
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Filing date
Publication date
Application filed by KS Gleitlager GmbH filed Critical KS Gleitlager GmbH
Publication of EP4271847A1 publication Critical patent/EP4271847A1/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/02—Alloys based on copper with tin as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/04—Alloys based on copper with zinc as the next major constituent

Definitions

  • the invention relates to a copper-tin
  • Continuous cast alloy which is lead-free and which can be manufactured and cast easily and economically and can be easily machined after casting and has good mechanical strength and load-bearing properties, which makes it particularly suitable for the manufacture of machine parts or transmission parts such as gear wheels, worm wheels, Bushings or linear guide elements, or for the production of fitting parts for the management of fluids can appear suitable.
  • the present invention which has its starting point in copper-tin continuously cast alloys with higher tin contents, it was found that a reduction of the tin content in the range given at the outset and the partial substitution of tin by zinc entails casting problems. A dendritic structure is formed, which is difficult to feed in the casting process due to the large size
  • the omission of lead also means that the machinability of the alloy does not meet the requirements.
  • EP 3736 350 A1 relates to and discloses a multi-layer sliding bearing element made from a composite material comprising a supporting metal layer and a further layer, in particular a sliding layer, and optionally an intermediate layer between the supporting metal layer and the further layer.
  • the further layer is made of a cast alloy, specifically a lead-free copper-based alloy containing sulphide precipitations.
  • a composition for the lead-free copper-based alloy is claimed with: Sulfur between 0.1% by weight and 3% by weight, in particular between 0.3% by weight and 0.8% by weight,
  • Iron between 0.01% by weight and 4% by weight, in particular between 0.2% by weight and 2% by weight, in particular between 0.3% by weight and 1.5% by weight,
  • the proportion of chromium is between 0% by weight and 2% by weight, in particular between 0.01% by weight and 1% by weight, and the proportion of indium is between 0% by weight and 10% by weight.
  • -% and with at least one element from a second group consisting of silver, magnesium, indium, cobalt, Titanium, Zirconium, Arsenic, Lithium, Yttrium, Calcium, Vanadium, Molybdenum, Tungsten, Antimony, Selenium, Tellurium,
  • Preferably sulfur shall be present from 0.2 - 1.5 wt%, especially from 0.3 - 0.8 wt%, and preferably iron from 0.2 - 2 wt%, especially from 0.3-1.5% by weight may be present.
  • Intermetallic FeS phases which form alongside the copper sulphides, can reduce the tendency to galling.
  • the copper-based alloy should contain either zinc or tin. By avoiding the combination of both elements, a significant improvement in the casting properties of the alloy can be achieved through the reduction in the solidification interval that can be achieved.
  • the object of the present invention is to largely meet the above-mentioned aspects in a copper-tin continuously cast alloy without lead being added to the starting material. This object is achieved by a lead-free continuous casting copper-tin alloy with the features of claim 1.
  • lead-free alloy is mentioned here, this means that lead is not actively added as an alloying element and that an impurity-related residue of lead of at most 0.10% by weight, in particular at most 0.09% by weight, in particular at most 0.08% by weight, in particular at most 0.07% by weight, in particular at most 0.06% by weight and preferably at most 0.05% by weight.
  • indium in the claimed range can significantly improve castability. It was found that indium forms a low-melting phase with tin or copper, similar to a peritectic phase, and that this low-melting phase accumulates preferentially in the aforementioned microshrinks and is thus able to fill these cavities in a sealing manner. This can more satisfactorily solve the problem of poor feeding performance of a zinciferous copper-tin alloy. Overall, the composition of the continuously cast alloy claimed according to the invention results in economic manufacturability and nevertheless good castability.
  • indium causes not only an improvement in the feeding behavior and thus the Castability, but also the machinability of the material is improved by the phases containing indium acting as chip breakers during machining. This is because these phases are comparatively hard, but they have a lower melting point than the metallic base matrix of the alloy. It was also found according to the invention that part of the indium can be substituted to a certain extent by adding sulfur, which is cheaper than indium, and that an improvement in dense feeding and machinability can nevertheless be achieved. However, a combination of indium and sulfur can cause wetting and adhesion to the mold, which is undesirable. Therefore, the sum of the proportion of indium and sulfur is limited to 2.0% by weight.
  • Corrosion resistance of the alloy can be improved and the influence of the wall thickness on the mechanical strength decreases.
  • nickel With the addition of nickel to the extent claimed, the resulting lattice next to the
  • Nickel can also form intermetallic phases with other alloying elements, which serve as nuclei for structural refinement, for example nickel-iron phases.
  • the continuously cast alloy contains at most 0.30% by weight, in particular at most 0.10% by weight, in particular 0.03-0.08% by weight, of phosphorus, at most 0.20% by weight -% iron and at most 0.30 % by weight of antimony.
  • Phosphorus may prove advantageous within the claimed continuously cast alloy because it can cause deoxidation of the melt while hydrogen can be effectively driven off by the tin.
  • Iron can form advantageous phases with nickel, but on the other hand it proves to be problematic in terms of casting at amounts above 0.2% by weight.
  • Antimony settles at the grain boundaries and thereby makes the material somewhat brittle, which proves to be an advantage with regard to the goal of good machinability through breaking chips.
  • Manganese can also be used to deoxidize the melt. Similar to nickel, manganese can be incorporated into the metallic lattice during solidification. However, this reduces the solubility for the element tin and the solidification temperatures are generally lower. The disadvantage is the relatively dense oxide skins, which can lead to uncontrolled drops in strength. The manganese content is therefore limited to 0.5% by weight.
  • the sum of the percentages by weight of indium and sulfur is at least 0.6% by weight, in particular at least 0.7% by weight, in particular at least 0.8% by weight, in particular at least 0.9 % by weight, in particular at least 1.0% by weight, in particular at least 1.1% by weight, in particular at least 1.2% by weight and/or in particular at most 1.9% by weight, in particular at most 1, 8% by weight, in particular at most 1.7% by weight.
  • the copper-tin continuously cast alloy contains at least 0.2% by weight, in particular at least 0.3% by weight, in particular at least 0.4% by weight, in particular at least 0.5% by weight, in particular at least 0.7% by weight, in particular at least 1.0% by weight, and/or at most 1.8% by weight, in particular at most 1.7% by weight, indium includes.
  • the copper-tin continuously cast alloy contains at least 0.3% by weight, in particular at least 0.4% by weight and/or in particular at most 0.7% by weight, in particular at most 0.6% by weight sulfur.
  • the copper-tin continuous casting alloy contains at least 3.0% by weight, in particular at least 4.0% by weight, in particular at least 4.5%, in particular at least 5.0% by weight, in particular at least 5.5% by weight, in particular at least 6.0% by weight and/or at most 7.5% by weight, in particular at most 7% by weight, of tin.
  • the copper-tin continuous casting alloy contains at least 2.0% by weight, in particular at least 2.5% by weight, in particular at least 3.0% by weight, in particular at least 3.5 in particular at least 4.0% by weight and/or in particular at most 5.5% by weight, in particular at most 5.0% by weight zinc.
  • a continuously cast alloy suitable for the production of drinking water fittings or drinking water piping comprises 3.0 to 5.0% by weight of tin and 1.5 to 3.0% by weight of zinc.
  • a continuous casting alloy suitable for the production of other fittings, in particular sanitary fittings and sanitary piping, comprises 5.5 to 8.0% by weight of tin and 2.0 to 5.0% by weight of zinc, the sum of the percentage by weight of tin and Zinc is 8.0-12.0% by weight.
  • the sum of the percentages by weight of tin and zinc is at least 8.5% by weight, in particular at least 9.0% by weight, in particular at least 9.5% by weight, in particular at least 10 0% by weight and/or at most 11.5% by weight, in particular at most 11.0% by weight.
  • the subject matter of the present invention is a continuously cast alloy of the claimed composition in the molten state. Furthermore, the subject matter of the present invention is a continuously cast alloy of the claimed composition in the cast state.
  • the subject matter of the present invention is also a continuously cast blank or a continuously cast intermediate product, in particular in the form of a strand or tube, produced by casting a continuously cast alloy of the type claimed and composition and having the same composition as this continuous casting alloy.
  • the subject matter of the invention also includes machine parts or transmission parts, in particular gears, worm wheels, bushings or linear guide parts, or machined fitting parts for conducting fluids, produced by machining a continuously cast blank or continuously cast intermediate product of the type claimed here.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)

Abstract

The invention relates to a lead-free copper-tin continuous casting alloy, in particular for manufacturing machine parts or transmission parts, more particularly gears, worm gears, cylinder liners or linear guide parts, or for the manufacture of fitting parts for carrying fluids. The alloy contains 3.0 - 8.0 wt.% of tin, 1.5 - 6.0 wt.% of zinc, 0.1 - 1.8 wt.% of indium, 0.2 - 0.8 wt.% of sulfur, the sum of the wt.% proportion of tin and zinc amounting to 5.0 - 12.0 wt.%, and the sum of the wt.% proportion of indium and sulfur amounting to 0.5 - 2.0 wt.%, and furthermore optionally following alloying elements: up to 0.20 wt.% of iron, up to 2.5 wt.% of nickel, up to 0.30 wt.% of antimony, up to 0.50 wt. % of manganese, up to 0.3 wt.% of phosphorus, and elements caused by impurities amounting to not more than 0.10 wt.% each and in sum to not more than 0.5 wt.%, and the remainder copper.

Description

Titel : Kuper-Zinn-Stranggusslegierung Title : Copper-tin continuous cast alloy
Beschreibung description
Die Erfindung betrifft eine Kupfer-Zinn-The invention relates to a copper-tin
Stranggusslegierung, die bleifrei ausgebildet ist und die sich gut und auf wirtschaftliche Weise hersteilen und vergießen lässt und nach dem Guss gut spanbar ist und gute mechanische Festigkeits- und Belastungseigenschaften aufweist, die sie insbesondere für die Herstellung von Maschinenteilen oder Getriebeteilen, wie Zahnrädern, Schneckenrädern, Laufbuchsen oder Linearführungselementen, oder für die Herstellung von Armaturenteilen für die Leitung von Fluiden geeignet erscheinen lässt. Mit der vorliegenden Erfindung, welche bei Kupfer-Zinn- Stranggusslegierungen mit höheren Zinngehalten ihren Ausgangspunkt hat, wurde festgestellt, dass eine Reduzierung des Zinngehalts in den eingangs gegebenen Bereich und die teilweise Substituierung von Zinn durch Zink gießtechnische Probleme mit sich bringt. Es bildet sich ein dendritisches Gefüge, welches sich im Gießvorgang schwer speisen lässt aufgrund des großenContinuous cast alloy which is lead-free and which can be manufactured and cast easily and economically and can be easily machined after casting and has good mechanical strength and load-bearing properties, which makes it particularly suitable for the manufacture of machine parts or transmission parts such as gear wheels, worm wheels, Bushings or linear guide elements, or for the production of fitting parts for the management of fluids can appear suitable. With the present invention, which has its starting point in copper-tin continuously cast alloys with higher tin contents, it was found that a reduction of the tin content in the range given at the outset and the partial substitution of tin by zinc entails casting problems. A dendritic structure is formed, which is difficult to feed in the casting process due to the large size
Temperaturintervalls zwischen Solidus- und Liquidus-Kurve des Systems. Im Ergebnis bilden sich zwischen den dendritisch aufwachsenden Primärkörnern Hohlräume, nämlich sogenannte Mikrolunker, welche eine Undichtigkeit des Gussstücks und hieraus hergestellter Produkte nach sich ziehen können. Eine Verwendung der Stranggusslegierung zur Herstellung von Armaturenteilen wäre dann nicht möglich. Temperature interval between the solidus and liquidus curves of the system. As a result, cavities form between the dendritically growing primary grains, namely so-called micro blowholes, which can result in leaks in the casting and in the products made from it. It would then not be possible to use the continuously cast alloy for the production of valve parts.
Die Weglassung von Blei führt außerdem dazu, dass die Spanbarkeit der Legierung nicht den Anforderungen gerecht wird. The omission of lead also means that the machinability of the alloy does not meet the requirements.
EP 3736 350 Al betrifft und offenbart ein Mehrschichtgleitlagerelement aus einem Verbundwerkstoff umfassend eine Stützmetallschicht und eine weitere Schicht, insbesondere eine Gleitschicht, sowie gegebenenfalls eine Zwischenschicht zwischen der Stützmetallschicht und der weiteren Schicht. Die weitere Schicht ist aus einer Gusslegierung, und zwar aus einer bleifreien Kupferbasislegierung gebildet, in der sulfidische Ausscheidungen enthalten sind. Beansprucht ist eine Zusammensetzung für die bleifreie Kupferbasislegierung mit: Schwefel zwischen 0,1 Gew.-% und 3 Gew.-%, insbesondere zwischen 0,3 Gew.-% und 0,8 Gew.-%, EP 3736 350 A1 relates to and discloses a multi-layer sliding bearing element made from a composite material comprising a supporting metal layer and a further layer, in particular a sliding layer, and optionally an intermediate layer between the supporting metal layer and the further layer. The further layer is made of a cast alloy, specifically a lead-free copper-based alloy containing sulphide precipitations. A composition for the lead-free copper-based alloy is claimed with: Sulfur between 0.1% by weight and 3% by weight, in particular between 0.3% by weight and 0.8% by weight,
Eisen zwischen 0,01 Gew.-% und 4 Gew.-%, insbesondere zwischen 0,2 Gew.% und 2 Gew.-%, insbesondere zwischen 0,3 Gew.-% und 1,5 Gew.-%, Iron between 0.01% by weight and 4% by weight, in particular between 0.2% by weight and 2% by weight, in particular between 0.3% by weight and 1.5% by weight,
Phosphor zwischen 0 Gew.-% und 2 Gew.-%, insbesondere zwischen 0,001 Gew.-% und 2 Gew.-%, insbesondere zwischen 0,01 Gew.-% und 0,5 Gew.-%, zumindest ein Element aus einer ersten Gruppe bestehend aus Zink, Zinn, Aluminium, Mangan, Nickel, Silizium, Chrom, Indium von in Summe zwischen 0,1 Gew.-% und 49 Gew.-%, wobei der Anteil an Zink zwischen 0 Gew.-% und 45 Gew.%, insbesondere zwischen 0,01 Gew.-% und 5 Gew.% beträgt, der Anteil an Zinn zwischen 0 Gew.-% und 40 Gew.-%, insbesondere zwischen 0,01 Gew.-% und 10 Gew.% beträgt, der Anteil an Aluminium zwischen 0 Gew.% und 15 Gew.-%, insbesondere zwischen 0,01 Gew.-% und 7,5 Gew.% beträgt, der Anteil an Mangan zwischen 0 Gew.-% und 10 Gew.-%, insbesondere zwischen 0,01 Gew.-% und 5 Gew.% beträgt, der Anteil an Nickel zwischen 0 Gew.-% und 10 Gew.-%, insbesondere zwischen 0,01 Gew.-% und 2 Gew.% beträgt, der Anteil an Silizium zwischen 0 Gew.-% und 10 Gew.-%. insbesondere zwischen 0,01 Gew.-% und 3 Gew. Phosphorus between 0% by weight and 2% by weight, in particular between 0.001% by weight and 2% by weight, in particular between 0.01% by weight and 0.5% by weight, at least one element a first group consisting of zinc, tin, aluminium, manganese, nickel, silicon, chromium, indium totaling between 0.1% by weight and 49% by weight, the proportion of zinc being between 0% by weight and 45% by weight, in particular between 0.01% by weight and 5% by weight, the proportion of tin is between 0% by weight and 40% by weight, in particular between 0.01% by weight and 10% by weight .%, the proportion of aluminum is between 0% by weight and 15% by weight, in particular between 0.01% by weight and 7.5% by weight, the proportion of manganese is between 0% by weight and 10 % by weight, in particular between 0.01% by weight and 5% by weight, the proportion of nickel is between 0% by weight and 10% by weight, in particular between 0.01% by weight and 2% by weight .% is the proportion of silicon between 0 wt .-% and 10 wt .-%. in particular between 0.01% by weight and 3% by weight.
% beträgt, der Anteil an Chrom zwischen 0 Gew.-% und 2 Gew.-%, insbesondere zwischen 0,01 Gew.-% und 1 Gew.% beträgt und der Anteil an Indium zwischen 0 Gew.-% und 10 Gew.-% beträgt, und mit zumindest einem Element aus einer zweiten Gruppe bestehend aus Silber, Magnesium, Indium, Kobalt, Titan, Zirkonium, Arsen, Lithium, Yttrium, Calcium, Vanadium, Molybdän, Wolfram, Antimon, Selen, Tellur,%, the proportion of chromium is between 0% by weight and 2% by weight, in particular between 0.01% by weight and 1% by weight, and the proportion of indium is between 0% by weight and 10% by weight. -%, and with at least one element from a second group consisting of silver, magnesium, indium, cobalt, Titanium, Zirconium, Arsenic, Lithium, Yttrium, Calcium, Vanadium, Molybdenum, Tungsten, Antimony, Selenium, Tellurium,
Bismut, Niob, Palladium in einem Anteil von jeweils zwischen 0 Gew.-% und 1,5 Gew.-%, wobei der Summenanteil der Elemente der zweiten Gruppe zwischen 0 Gew.-% und 2 Gew.-% beträgt, und mit Rest Kupfer sowie aus der Herstellung der Elemente stammende Verunreinigungen. Bismuth, niobium, palladium in a proportion of between 0% by weight and 1.5% by weight, the total proportion of the elements of the second group being between 0% by weight and 2% by weight, and with the remainder Copper and impurities originating from the manufacture of the elements.
Bevorzugt soll Schwefel von 0,2 - 1,5 Gew.-%, insbesondere von 0,3 - 0,8 Gew.-%, vorhanden sein, und bevorzugt soll Eisen von 0,2 - 2 Gew.-%, insbesondere von 0,3 - 1,5 Gew.-% vorhanden sein. Durch intermetallische FeS-Phasen, die neben den Kupfersulfiden entstehen, könne eine Verringerung der Fressneigung erreicht werden. Weiter bevorzugt soll die Kupferbasislegierung entweder Zink oder Zinn enthalten. Durch die Vermeidung der Kombination beider Elemente könne eine deutliche Verbesserung der Gießeigenschaften der Legierung durch die damit erreichbare Verringerung des Erstarrungsintervalls erreicht werden. Es gibt 183 Beispiel- Zusammensetzungen, von denen 25 kein Indium oder nur 0,01 Gew.-% Indium enthalten. Fast alle übrigen Beispiel- Zusammensetzungen enthalten 3 oder 7 Gew.-%Preferably sulfur shall be present from 0.2 - 1.5 wt%, especially from 0.3 - 0.8 wt%, and preferably iron from 0.2 - 2 wt%, especially from 0.3-1.5% by weight may be present. Intermetallic FeS phases, which form alongside the copper sulphides, can reduce the tendency to galling. More preferably, the copper-based alloy should contain either zinc or tin. By avoiding the combination of both elements, a significant improvement in the casting properties of the alloy can be achieved through the reduction in the solidification interval that can be achieved. There are 183 example compositions, 25 of which contain no indium or only 0.01% by weight indium. Almost all other example compositions contain 3 or 7% by weight
Indium und dabei zusätzlich eher hohe Anteile an Aluminium und Mangan; sie enthalten ferner zumeist entweder 10 Gew.-% Zinn oder 5 Gew.-% Zink. Indium and, in addition, rather high proportions of aluminum and manganese; they also usually contain either 10% by weight of tin or 5% by weight of zinc.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, den eingangs genannten Aspekten bei einer Kupfer-Zinn- Stranggusslegierung weitgehend gerecht, ohne dass dem Ausgangsmaterial Blei zugegeben wird. Diese Aufgabe wird durch eine bleifreie Kupfer-Zinn- Stranggusslegierung mit den Merkmalen des Anspruchs 1 gelöst. The object of the present invention is to largely meet the above-mentioned aspects in a copper-tin continuously cast alloy without lead being added to the starting material. This object is achieved by a lead-free continuous casting copper-tin alloy with the features of claim 1.
Wenn vorliegend von einer bleifreien Legierung die Rede ist, so bedeutet dies, dass Blei nicht aktiv als Legierungselement zugegeben ist und dass ein verunreinigungsbedingter Rest an Blei von höchstens 0,10 Gew.-%, insbesondere von höchstens 0,09 Gew.-%, insbesondere von höchstens 0,08 Gew.-%, insbesondere von höchstens 0,07, insbesondere von höchstens 0,06 und vorzugsweise von höchstens 0,05 Gew.-% vorhanden ist. If a lead-free alloy is mentioned here, this means that lead is not actively added as an alloying element and that an impurity-related residue of lead of at most 0.10% by weight, in particular at most 0.09% by weight, in particular at most 0.08% by weight, in particular at most 0.07% by weight, in particular at most 0.06% by weight and preferably at most 0.05% by weight.
Es wurde nun erfindungsgemäß festgestellt, dass die Zugabe von Indium im beanspruchten Bereich die Vergießbarkeit wesentlich verbessern kann. Es wurde festgestellt, dass Indium mit Zinn bzw. Kupfer eine niedrigschmelzende Phase, ähnlich einer peritektischen Phase, bildet und dass diese niedrigschmelzende Phase sich bevorzugt in den vorgenannten Mikrolunkern ansammelt und diese Hohlräume dadurch dichtend aufzufüllen vermag. Hierdurch kann das Problem des schlechten Speisungsverhaltens einer zinkhaltigen Kupfer- Zinn Legierung in zufriedenstellenderer Weise gelöst werden. Insgesamt ergibt sich bei der beanspruchten erfindungsgemäßen Zusammensetzung der Stranggusslegierung eine wirtschaftliche Herstellbarkeit und dennoch eine gute Gießbarkeit. Die Zugabe von Indium bewirkt mit der oder den sich hieraus bildenden quasi-peritektischen Phase(n) nicht nur eine Verbesserung des Speisungsverhaltens und damit der Gießbarkeit, sondern es wird auch die Spanbarkeit des Werkstoffs verbessert, indem sich die Indium aufweisenden Phasen als Spanbrecher während der spanenden Bearbeitung auswirken. Diese Phasen sind nämlich vergleichsweise hart, sie weisen jedoch einen niedrigeren Schmelzpunkt auf als die metallische Grundmatrix der Legierung. Weiter wurde erfindungsgemäß festgestellt, dass sich ein Teil des Indiums durch Zugabe von gegenüber Indium preiswerterem Schwefel gewissermaßen substituieren lässt und dass dennoch eine Verbesserung der Dichtspeisung und der Spanbarkeit erzielt werden kann. Allerdings kann eine Kombination von Indium und Schwefel zu einer Benetzung und Anhaftung an der Gießform führen, was unerwünscht ist. Daher wird die Summe des Anteils aus Indium und Schwefel auf 2,0 Gew.-% begrenzt . It has now been found according to the invention that the addition of indium in the claimed range can significantly improve castability. It was found that indium forms a low-melting phase with tin or copper, similar to a peritectic phase, and that this low-melting phase accumulates preferentially in the aforementioned microshrinks and is thus able to fill these cavities in a sealing manner. This can more satisfactorily solve the problem of poor feeding performance of a zinciferous copper-tin alloy. Overall, the composition of the continuously cast alloy claimed according to the invention results in economic manufacturability and nevertheless good castability. The addition of indium causes not only an improvement in the feeding behavior and thus the Castability, but also the machinability of the material is improved by the phases containing indium acting as chip breakers during machining. This is because these phases are comparatively hard, but they have a lower melting point than the metallic base matrix of the alloy. It was also found according to the invention that part of the indium can be substituted to a certain extent by adding sulfur, which is cheaper than indium, and that an improvement in dense feeding and machinability can nevertheless be achieved. However, a combination of indium and sulfur can cause wetting and adhesion to the mold, which is undesirable. Therefore, the sum of the proportion of indium and sulfur is limited to 2.0% by weight.
Durch die Zugabe von Nickel kann dieBy adding nickel, the
Korrosionsbeständigkeit der Legierung verbessert werden und der Wandstärkeneinfluss auf die mechanische Festigkeit nimmt ab. Bei Zugabe von Nickel im beanspruchten Umfang kann das entstehende Gitter neben derCorrosion resistance of the alloy can be improved and the influence of the wall thickness on the mechanical strength decreases. With the addition of nickel to the extent claimed, the resulting lattice next to the
Mischkristallverfestigung durch Zinn noch weiter verspannt werden. Nickel kann auch mit weiteren Legierungselementen intermetallische Phasen bilden, die als Keime zur Gefügefeinung dienen, beispielsweise Nickel-Eisen-Phasen. Mixed crystal strengthening by tin can be tightened even further. Nickel can also form intermetallic phases with other alloying elements, which serve as nuclei for structural refinement, for example nickel-iron phases.
Gießtechnisch erweist es sich weiter als vorteilhaft, wenn die Stranggusslegierung höchstens 0,30 Gew.-%, insbesondere höchstens 0,10 Gew.-%, insbesondere 0,03 - 0,08 Gew.-% Phosphor, höchstens 0,20 Gew.-% Eisen und höchstens 0,30 Gew.-% Antimon umfasst. Phosphor kann sich innerhalb der beanspruchten Stranggusslegierung als vorteilhaft erweisen, weil es eine Desoxidation der Schmelze bewirken kann, während Wasserstoff durch das Zinn wirksam ausgetrieben werden kann. Eisen kann mit Nickel vorteilhafte Phasen ausbilden, wobei es sich aber andererseits bei Mengen oberhalb von 0,2 Gew.-% als gießtechnisch problematisch erweist. Antimon setzt sich an den Korngrenzen ab und versprödet dadurch das Material etwas, was sich im Hinblick auf das Ziel einer guten Spanbarkeit durch brechende Späne durchaus als vorteilhaft erweist. In terms of casting technology, it is also advantageous if the continuously cast alloy contains at most 0.30% by weight, in particular at most 0.10% by weight, in particular 0.03-0.08% by weight, of phosphorus, at most 0.20% by weight -% iron and at most 0.30 % by weight of antimony. Phosphorus may prove advantageous within the claimed continuously cast alloy because it can cause deoxidation of the melt while hydrogen can be effectively driven off by the tin. Iron can form advantageous phases with nickel, but on the other hand it proves to be problematic in terms of casting at amounts above 0.2% by weight. Antimony settles at the grain boundaries and thereby makes the material somewhat brittle, which proves to be an advantage with regard to the goal of good machinability through breaking chips.
Mangan kann ebenfalls zur Desoxidation der Schmelze eingesetzt werden. Während der Erstarrung kann Mangan, ähnlich wie Nickel, in das metallische Gitter eingebaut werden. Dabei sinkt jedoch die Löslichkeit für das Element Zinn, und die Erstarrungstemperaturen werden im Allgemeinen erniedrigt. Nachteilig sind die relativ dichten Oxidhäute, die zu unkontrollierten Festigkeitsabfällen führen können. Daher wird der Mangan-Gehalt bis auf 0,5 Gew.-% begrenzt. Manganese can also be used to deoxidize the melt. Similar to nickel, manganese can be incorporated into the metallic lattice during solidification. However, this reduces the solubility for the element tin and the solidification temperatures are generally lower. The disadvantage is the relatively dense oxide skins, which can lead to uncontrolled drops in strength. The manganese content is therefore limited to 0.5% by weight.
Es erweist sich als vorteilhaft, wenn die Summe des gewichtsprozentualen Anteils von Indium und Schwefel wenigstens 0,6 Gew.-%, insbesondere wenigstens 0,7 Gew.-%, insbesondere wenigstens 0,8 Gew.-%, insbesondere wenigstens 0,9 Gew.-% insbesondere wenigstens 1,0 Gew.-%, insbesondere wenigstens 1,1 Gew.-%, besondere wenigstens 1,2 Gew.-% und/oder insbesondere höchstens 1,9 Gew.-%, insbesondere höchstens 1,8 Gew.-%, insbesondere höchstens 1,7 Gew.-% beträgt . In weiterer Ausbildung der vorliegenden Erfindung erweist es sich als vorteilhaft, wenn die Kupfer-Zinn- Stranggusslegierung wenigstens 0,2 Gew.-%, insbesondere wenigstens 0,3 Gew.-%, insbesondere wenigstens 0,4 Gew.-%, insbesondere wenigstens 0,5 Gew.-%, insbesondere wenigstens 0,7 Gew.-%, insbesondere wenigstens 1,0 Gew.-%, und/oder höchstens 1,8 Gew.-%, insbesondere höchstens 1,7 Gew.-% Indium umfasst. It has proven to be advantageous if the sum of the percentages by weight of indium and sulfur is at least 0.6% by weight, in particular at least 0.7% by weight, in particular at least 0.8% by weight, in particular at least 0.9 % by weight, in particular at least 1.0% by weight, in particular at least 1.1% by weight, in particular at least 1.2% by weight and/or in particular at most 1.9% by weight, in particular at most 1, 8% by weight, in particular at most 1.7% by weight. In a further embodiment of the present invention, it proves to be advantageous if the copper-tin continuously cast alloy contains at least 0.2% by weight, in particular at least 0.3% by weight, in particular at least 0.4% by weight, in particular at least 0.5% by weight, in particular at least 0.7% by weight, in particular at least 1.0% by weight, and/or at most 1.8% by weight, in particular at most 1.7% by weight, indium includes.
Im Hinblick auf den Schwefelanteil erweist es sich als vorteilhaft, wenn die Kupfer-Zinn-Stranggusslegierung wenigstens 0,3 Gew.-%, insbesondere wenigstens 0,4 Gew.-% und/oder insbesondere höchstens 0,7 Gew.-%, insbesondere höchstens 0,6 Gew.-% Schwefel umfasst. With regard to the sulfur content, it proves to be advantageous if the copper-tin continuously cast alloy contains at least 0.3% by weight, in particular at least 0.4% by weight and/or in particular at most 0.7% by weight, in particular at most 0.6% by weight sulfur.
Weiter erweist es sich als vorteilhaft, wenn die Kupfer- Zinn-Stranggusslegierung wenigstens 3,0 Gew.-%, insbesondere wenigstens 4,0 Gew.-%, insbesondere wenigstens 4,5, insbesondere wenigstens 5,0 Gew.-%, insbesondere wenigstens 5,5 Gew.-%, insbesondere wenigstens 6,0 Gew.-% und/oder höchstens 7,5 Gew.-%, insbesondere höchstens 7 Gew.-% Zinn umfasst. It is also found to be advantageous if the copper-tin continuous casting alloy contains at least 3.0% by weight, in particular at least 4.0% by weight, in particular at least 4.5%, in particular at least 5.0% by weight, in particular at least 5.5% by weight, in particular at least 6.0% by weight and/or at most 7.5% by weight, in particular at most 7% by weight, of tin.
Des Weiteren erweist es sich als vorteilhaft, wenn die Kupfer-Zinn-Stranggusslegierung wenigstens 2,0 Gew.-%, insbesondere wenigstens 2,5 Gew.-%, insbesondere wenigstens 3,0 Gew.-%, insbesondere wenigstens 3,5, insbesondere wenigstens 4,0 Gew.-% und/oder insbesondere höchstens 5,5 Gew.-%, insbesondere höchstens 5,0 Gew.-% Zink umfasst. Eine für die Herstellung von Trinkwasserarmaturen oder Trinkwasserverrohrung geeignete Stranggusslegierung umfasst 3,0 bis 5,0 Gew.-% Zinn und 1,5 - 3,0 Gew.-% Zink. Furthermore, it proves to be advantageous if the copper-tin continuous casting alloy contains at least 2.0% by weight, in particular at least 2.5% by weight, in particular at least 3.0% by weight, in particular at least 3.5 in particular at least 4.0% by weight and/or in particular at most 5.5% by weight, in particular at most 5.0% by weight zinc. A continuously cast alloy suitable for the production of drinking water fittings or drinking water piping comprises 3.0 to 5.0% by weight of tin and 1.5 to 3.0% by weight of zinc.
Eine für die Herstellung von sonstigen Armaturen, insbesondere Sanitärarmaturen und Sanitärverrohrung geeignete Stranggusslegierung umfasst 5,5 bis 8,0 Gew.-% Zinn und 2,0 - 5,0 Gew.-% Zink, wobei die Summe des gewichtsprozentualen Anteils von Zinn und Zink 8,0 - 12,0 Gew.-% beträgt. A continuous casting alloy suitable for the production of other fittings, in particular sanitary fittings and sanitary piping, comprises 5.5 to 8.0% by weight of tin and 2.0 to 5.0% by weight of zinc, the sum of the percentage by weight of tin and Zinc is 8.0-12.0% by weight.
Auch erweist es sich als vorteilhaft, wenn die Summe des gewichtsprozentualen Anteils von Zinn und Zink wenigstens 8,5 Gew.-%, insbesondere wenigstens 9,0 Gew.-%, insbesondere wenigstens 9,5 Gew.-%, insbesondere wenigstens 10,0 Gew.-%, und/oder höchstens 11,5 Gew.-%, insbesondere höchstens 11,0 Gew.-% beträgt. It also proves to be advantageous if the sum of the percentages by weight of tin and zinc is at least 8.5% by weight, in particular at least 9.0% by weight, in particular at least 9.5% by weight, in particular at least 10 0% by weight and/or at most 11.5% by weight, in particular at most 11.0% by weight.
Gegenstand der vorliegenden Erfindung ist eine Stranggusslegierung der beanspruchten Zusammensetzung im erschmolzenen Zustand. Ferner ist Gegenstand der vorliegenden Erfindung eine Stranggusslegierung der beanspruchten Zusammensetzung im vergossenen Zustand. The subject matter of the present invention is a continuously cast alloy of the claimed composition in the molten state. Furthermore, the subject matter of the present invention is a continuously cast alloy of the claimed composition in the cast state.
Gegenstand der vorliegenden Erfindung ist auch ein Strangguss-Rohling oder ein Strangguss-Zwischenprodukt, insbesondere in Strangform oder Rohrform, hergestellt durch Vergießen einer Stranggusslegierung der beanspruchten Art und Zusammensetzung und mit derselben Zusammensetzung wie diese Stranggußlegierung. The subject matter of the present invention is also a continuously cast blank or a continuously cast intermediate product, in particular in the form of a strand or tube, produced by casting a continuously cast alloy of the type claimed and composition and having the same composition as this continuous casting alloy.
Ferner sind Gegenstand der Erfindung spanend gefertigte Maschinenteile oder Getriebeteile, insbesondere Zahnräder, Schneckenräder, Laufbuchsen oder Linearführungsteile, oder spanend gefertigte Armaturenteile für die Leitung von Fluiden, hergestellt durch spanende Bearbeitung eines Strangguss-Rohlings oder Strangguss-Zwischenprodukts der hier beanspruchten Art. The subject matter of the invention also includes machine parts or transmission parts, in particular gears, worm wheels, bushings or linear guide parts, or machined fitting parts for conducting fluids, produced by machining a continuously cast blank or continuously cast intermediate product of the type claimed here.

Claims

Patentansprüche patent claims
1. Kupfer-Zinn-Stranggusslegierung, die bleifrei ausgebildet ist, insbesondere für die Herstellung von Maschinenteilen oder Getriebeteilen, wie insbesondere Zahnräder, Schneckenräder, Laufbuchsen oder Linearführungsteile, oder für die Herstellung von Armaturenteilen für die Leitung von Fluiden, umfassend 1. Copper-tin continuous casting alloy, which is lead-free, in particular for the production of machine parts or transmission parts, such as in particular gears, worm wheels, bushings or linear guide parts, or for the production of fitting parts for the conduction of fluids, comprising
3,0 - 8,0 Gew.-% Zinn, 3.0 - 8.0% by weight tin,
1,5 - 6,0 Gew.-% Zink, 1.5 - 6.0% by weight zinc,
0,1 - 1,8 Gew.-% Indium, 0.1 - 1.8% by weight indium,
0,2 - 0,8 Gew.-% Schwefel, wobei die Summe des gewichtsprozentualen Anteils von0.2 - 0.8 wt .-% sulfur, the sum of the weight percentage of
Zinn und Zink 5,0 - 12,0 Gew.-% beträgt, wobei die Summe des gewichtsprozentualen Anteils vonTin and zinc is 5.0 - 12.0% by weight, the sum of the weight percentage of
Indium und Schwefel 0,5 - 2,0 Gew.-% beträgt, und weiter gegebenenfalls umfassend folgende indium and sulfur is 0.5 - 2.0% by weight, and further optionally comprising the following
Legierungselernente bis 0,20 Gew.-% Eisen, bis 2,5 Gew.-% Nickel, bis 0,30 Gew.-% Antimon, bis 0,50 Gew.-% Mangan, bis 0,3 Gew.-% Phosphor, und verunreinigungsbedingte Elemente jeweils bis höchstens 0,10 Gew.-% und in der Summe höchstens bis 0,5 Gew.-%, und Rest Kupfer. 2. Kupfer-Zinn-Stranggusslegierung nach Anspruch 1, dadurch gekennzeichnet, dass die Summe des gewichtsprozentualen Anteils von Indium und Schwefel wenigstens 0,6 Gew.-%, insbesondere wenigstens 0,7 Gew.-%, insbesondere wenigstens 0,8 Gew.-%, insbesondere wenigstens 0,9 Gew.-% insbesondere wenigstens 1,0 Gew.-%, insbesondere wenigstens 1,1 Gew.-%, besondere wenigstens 1,Alloying elements up to 0.20% by weight iron, up to 2.5% by weight nickel, up to 0.30% by weight antimony, up to 0.50% by weight manganese, up to 0.3% by weight phosphorus , and impurity-related elements each up to a maximum of 0.10% by weight and a total of up to a maximum of 0.5% by weight, and the remainder copper. 2. Copper-tin continuously cast alloy according to claim 1, characterized in that the sum of the percentages by weight of indium and sulfur is at least 0.6% by weight, in particular at least 0.7% by weight, in particular at least 0.8% by weight. -%, in particular at least 0.9% by weight, in particular at least 1.0% by weight, in particular at least 1.1% by weight, in particular at least 1,
2 Gew.-% und/oder insbesondere höchstens 1,9 Gew.-%, insbesondere höchstens 1,8 Gew.-%, insbesondere höchstens 1,7 Gew.-% beträgt. 2% by weight and/or in particular at most 1.9% by weight, in particular at most 1.8% by weight, in particular at most 1.7% by weight.
3. Kupfer-Zinn-Stranggusslegierung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sie wenigstens 0,2 Gew.-%, insbesondere wenigstens 0,3 Gew.-%, insbesondere wenigstens 0,4 Gew.-%, insbesondere wenigstens 0,5 Gew.-%, insbesondere wenigstens 0,7 Gew.-%, insbesondere wenigstens 1,0 Gew.-%, und/oder höchstens 1,7 Gew.-% Indium umfasst. 3. Copper-tin continuously cast alloy according to claim 1 or 2, characterized in that it contains at least 0.2% by weight, in particular at least 0.3% by weight, in particular at least 0.4% by weight, in particular at least 0 5% by weight, in particular at least 0.7% by weight, in particular at least 1.0% by weight, and/or at most 1.7% by weight indium.
4. Kupfer-Zinn-Stranggusslegierung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass sie wenigstens 0,3 Gew.-%, insbesondere wenigstens 0,4 Gew.-% und/oder insbesondere höchstens 0,7 Gew.-%, insbesondere höchstens 0,6 Gew.-% Schwefel umfasst. 4. Copper-tin continuously cast alloy according to claim 1 or 2, characterized in that it contains at least 0.3% by weight, in particular at least 0.4% by weight and/or in particular at most 0.7% by weight, in particular at most 0.6% by weight sulfur.
5. Kupfer-Zinn-Stranggusslegierung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sie wenigstens 3,5 Gew.-%, insbesondere wenigstens 4,0 Gew.-%, insbesondere wenigstens 4,5 Gew.-%, insbesondere wenigstens 5,0 Gew.-%, insbesondere wenigstens 5,5 Gew.-%, insbesondere wenigstens 6,0 Gew.-% und/oder höchstens5. Copper-tin continuously cast alloy according to one or more of the preceding claims, characterized in that they contain at least 3.5% by weight, in particular at least 4.0% by weight, in particular at least 4.5% by weight, in particular at least 5.0 % by weight, in particular at least 5.5% by weight, in particular at least 6.0% by weight and/or at most
7.5 Gew.-%, insbesondere höchstens 7 Gew.-% Zinn umfasst. 7.5% by weight, in particular at most 7% by weight, of tin.
6. Kupfer-Zinn-Stranggusslegierung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sie wenigstens 2,0 Gew.-%, insbesondere wenigstens 2,5 Gew.-%, insbesondere wenigstens 3,0 Gew.-%, insbesondere wenigstens 3,5, insbesondere wenigstens 4,0 Gew.-% und/oder insbesondere höchstens 5,5 Gew.-%, insbesondere höchstens 5,0 Gew.-% Zink umfasst. 6. Copper-tin continuously cast alloy according to one or more of the preceding claims, characterized in that they contain at least 2.0% by weight, in particular at least 2.5% by weight, in particular at least 3.0% by weight, in particular at least 3.5, in particular at least 4.0% by weight and/or in particular at most 5.5% by weight, in particular at most 5.0% by weight zinc.
7. Kupfer-Zinn-Stranggusslegierung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sie 3,0 bis 5,0 Gew.-% Zinn und7. copper-tin continuous casting alloy according to one or more of the preceding claims, characterized in that they contain 3.0 to 5.0 wt .-% tin and
1.5 - 3,0 Gew.-% Zink umfasst. 1.5 - 3.0% by weight zinc.
8. Kupfer-Zinn-Stranggusslegierung nach einem oder mehreren der vorstehenden Ansprüche 1-6, dadurch gekennzeichnet, dass sie 5,5 bis 8,0 Gew.-% Zinn und 2,0 - 5,0 Gew.-% Zink umfasst und dass die Summe des gewichtsprozentualen Anteils von Zinn und Zink 8,0 - 12,0 Gew.-% beträgt 8. Copper-tin continuously cast alloy according to one or more of the preceding claims 1-6, characterized in that it comprises 5.5 to 8.0% by weight of tin and 2.0 to 5.0% by weight of zinc and that the sum of the weight percentages of tin and zinc is 8.0 - 12.0% by weight
9. Kupfer-Zinn-Stranggusslegierung nach einem oder mehreren der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Summe des gewichtsprozentualen Anteils von Zinn und Zink wenigstens 8,5 Gew.-%, insbesondere wenigstens 9,0 Gew.-%, insbesondere wenigstens 9,5 Gew.-%, insbesondere wenigstens 10,0 Gew.-%, und/oder höchstens 11,5 Gew.-%, insbesondere höchstens 11,0 Gew.-% beträgt. 9. Copper-tin continuously cast alloy according to one or more of the preceding claims, characterized in that the sum of the percentages by weight of tin and zinc is at least 8.5% by weight, in particular at least 9.0 % by weight, in particular at least 9.5% by weight, in particular at least 10.0% by weight, and/or at most 11.5% by weight, in particular at most 11.0% by weight.
10. Strangguss-Rohling oder Strangguss-Zwischenprodukt, insbesondere in Strangform oder Rohrform, hergestellt durch Vergießen einer Stranggusslegierung nach einem oder mehreren der vorstehenden Ansprüche, im Stranggießverfahren, wobei der Strangguss-Rohling oder das Strangguss-Zwischenprodukt umfasst: 10. continuously cast blank or continuously cast intermediate product, in particular in strand form or tube form, produced by casting a continuously cast alloy according to one or more of the preceding claims, in the continuous casting process, wherein the continuously cast blank or continuously cast intermediate product comprises:
3,0 - 8,0 Gew.-% Zinn, 3.0 - 8.0% by weight tin,
1,5 - 6,0 Gew.-% Zink, 1.5 - 6.0% by weight zinc,
0,1 - 1,8 Gew.-% Indium, 0.1 - 1.8% by weight indium,
0,2 - 0,8 Gew.-% Schwefel, wobei die Summe des gewichtsprozentualen Anteils von0.2 - 0.8 wt .-% sulfur, the sum of the weight percentage of
Zinn und Zink 5,0 - 12,0 Gew.-% beträgt, wobei die Summe des gewichtsprozentualen Anteils vonTin and zinc is 5.0 - 12.0% by weight, the sum of the weight percentage of
Indium und Schwefel 0,5 - 2,0 Gew.-% beträgt, und weiter gegebenenfalls umfassend folgende indium and sulfur is 0.5 - 2.0% by weight, and further optionally comprising the following
Legierungselernente bis 0,20 Gew.-% Eisen, bis 2,5 Gew.-% Nickel, bis 0,30 Gew.-% Antimon, bis 0,50 Gew.-% Mangan, bis 0,3 Gew.-% Phosphor, und verunreinigungsbedingte Elemente jeweils bis höchstens 0,10 Gew.-% und in der Summe höchstens bis 0,5 Gew.-%, und Rest Kupfer. Alloying elements up to 0.20% by weight iron, up to 2.5% by weight nickel, up to 0.30% by weight antimony, up to 0.50% by weight manganese, up to 0.3% by weight phosphorus , and impurity-related elements each up to a maximum of 0.10% by weight and a total of up to a maximum of 0.5% by weight, and the remainder copper.
11. Spanend gefertigte Maschinenteile oder Getriebeteile, insbesondere Zahnräder, Schneckenräder, Laufbuchsen oder Linearführungsteile, oder spanend gefertigte Armaturenteile für die Leitung von Fluiden, hergestellt durch spanende Bearbeitung eines11. Machined machine parts or transmission parts, in particular gears, worm wheels, bushings or linear guide parts, or machined fittings parts for the management of fluids, produced by machining a
Strangguss-Rohlings oder Strangguss-Zwischenprodukts nach Anspruch 10. Continuous cast blank or continuously cast intermediate product according to claim 10.
EP22724659.2A 2021-04-22 2022-04-21 Copper-tin continuous casting alloy Pending EP4271847A1 (en)

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JP2004300568A (en) * 2003-03-20 2004-10-28 Tanaka Kikinzoku Kogyo Kk Copper alloy for wind instrument
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