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 present invention relates to a water-conducting component with a basic body produced by means of casting.
• a water-conducting component according to the present invention in particular a fitting, fitting, or pump housing is considered.
• water-bearing components can also be pipes.
• a water-conducting component in the context of the present invention basically every casting is considered, which leads water and comes into contact with this.
• the present invention relates to a development of this water-conducting component, which is made as a casting of a copper alloy.
• Copper alloys have always been used as gunmetal alloys for the production of water-bearing components. Common representatives are cast bronze alloys according to DIN EN 1982.
• the gunmetal alloy CuSn5Zn5Pb5 here with between 4 to 6 wt .-% tin, zinc and lead at a level of up to 2.0 wt .-% nickel and up to 0.1% by weight of phosphorus and as admixtures up to 0.3% by weight of iron and up to 0.25% by weight of antimony.
• this material is characterized by good castability and corrosion resistance to seawater. With regard to the release of metal ions into the water, however, this material must be regarded as unsatisfactory against the background of the future expected limit values.
• the high lead levy of CuSn5Zn5Pb5 is criticized.
• the DIN 50 930 T6 in its currently valid version prescribes a proportion of up to 3.0 wt .-% lead.
• the specified CuSn5Zn5Pb2-b casting alloy should contain between 84 and 88% by weight of copper, not more than 0.6% by weight of nickel, not more than 0.04% by weight of phosphorus, not more than Containing 6.0% by weight of tin and not more than 6.0% by weight of zinc. Tin and zinc are each contained at least 4 wt .-% in the alloy.
• the machinability of castings made with the alloy one skilled in the art will envision a certain amount of lead, not significantly below the stated upper limit of 3.0% by weight, in the alloy.
• the GB-1 443 090 discloses a dezincification-enhanced copper alloy having between 80 and 90 weight percent copper, between 6.3 and 17.5 weight percent zinc and between 2.8 and 4.75 weight percent silicon as essential alloying ingredients between 0.03 and 0.05% by weight of arsenic.
• GB-1 443 090 proposed a heat treatment of the cast parts. In this heat treatment, the cast parts are annealed at temperatures between 600 ° C and 750 ° C for a period of 5 to 10 days and then quenched. This heat treatment is carried out with the aim of obtaining the ⁇ and ⁇ phases to be preferred in view of the corrosion. By quenching in particular the formation of phases is to be avoided, the corrosion resistance is low, so the p- and x-phase.
• a copper alloy which has up to 10% by weight of aluminum and up to 5% by weight of iron and which is used for the production of water-bearing components of water installations.
• this alloy shows inadequate corrosion behavior and, in particular, excessive migration of metal ions into the water.
• manganese alloy alloy As necessary alloy is known from the EP 1 817 438 known.
• copper alloys are from the CH 148 195 , of the US 2004/0234412 , of the DE 585 002 , of the DE 43 24 008 as well as the WO 94/24325 known.
• the present invention is based on the problem to provide a water-bearing component, which has a low migration tendency of lead and nickel in the water to be led.
• the invention wants to specify a water-conducting component made of a corresponding alloy, which has a sufficient tightness with regard to the water to be led.
• the present invention provides a water-conducting component having the features of claim 1.
• the component according to the invention consists of an alloy with a lead content and a nickel content of less than 0.1 wt .-%.
• the only essential alloy constituents besides copper are tin and zinc in the alloy. These three components constitute at least 99.75% by weight of the total alloy.
• the present invention proposes a high purity copper-tin-zinc alloy which is optimized in its migration properties due to the absence of lead and nickel.
• the proportions of these two elements are each below a proportion of 0.1 wt .-%.
• the remaining elements P, Fe, S and Sb are limited by the upper limits specified in claim 1.
• the iron content can be relatively high at 0.3% by weight. All other ingredients are below a limit that can be considered as an impurity limit.
• the upper limit for the lead and the nickel content is set to 0.05 wt .-%.
• lead and nickel are containing not more than 0.02 wt .-% in the alloy.
• the unavoidable impurities within the alloy are preferably limited to a total of 0.25% by weight.
• each element contained as an unavoidable impurity in the alloy is contained less than 0.02 wt% therein.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Sliding-Contact Bearings (AREA)

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Cited By (3)

Citations (11)

• 2009
  • 2009-08-04 EP EP09010054A patent/EP2290114A1/fr not_active Withdrawn

Patent Citations (11)

Non-Patent Citations (1)

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