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
  • C22C9/04—Alloys based on copper with zinc 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
  • C22C9/02—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
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon

Definitions

• the present invention relates to a copper alloy.
• the present invention relates to a copper alloy for the production of components for gas and sanitary installation, especially for components that are used in drinking water installation and come directly into contact with the guided in the components, usually pipes, fittings and fittings, drinking water ,
• EP-1 045 041 has already proposed a lead-free copper alloy which is said to have satisfactory machinability and which comprises up to 79% by weight of copper, from 2 to 4% by weight of silicon and the remainder zinc.
• This alloy is specifically for the manufacture of fittings, fittings and the like parts for water-bearing piping systems in question. The alloy, however, does not behave in red brass and consequently can not substitute for it.
• the present invention is based on the problem of specifying a copper alloy which meets the above-mentioned requirements in the best possible way and in particular shows a lower release of metal ions contained in the alloy to the medium, which is guided in components formed from the copper alloy and wets them directly.
• the copper alloy is particularly suitable for the production of gas or water pipes, especially for the production of drinking water pipes and their parts (for example, fittings and fittings) suitable and due to their properties the suitability to replace gunmetal.
• the alloy should not be worse than gunmetal in terms of its corrosion resistance.
• the copper alloy should be processed economically and reliably by means of casting.
• the present invention provides a copper alloy containing, by weight, not more than 10% zinc, not more than 13% tin, not more than 3% manganese and at least one element selected from the group containing aluminum and silicon in a proportion of between 0.01 and 5%.
• nickel of the alloy according to the invention is determined to be 2.0%, preferably 0.6%.
• Phosphorus is included at not more than 0.04%.
• the upper limit for the lead content is set at 3.0%.
• Iron is contained at not more than 0.5%, preferably not more than 0.3%.
• the amount of sulfur is not more than 0.04%.
• the content of antimony is not more than 0, 1%.
• the upper limit for the arsenic content is set at 0.03%.
• the remainder of the alloy contains copper and unavoidable impurities. However, the content of copper is more than 80% by weight.
• the alloy according to the invention may further contain at least one element of rare earths in a proportion of up to 3% by weight in order to improve the corrosion protection. Cerium (Ce) is currently considered as a preferred alloying element.
• the amount of nickel and / or lead in the alloy contained in the alloy can be reduced to a necessary minimum. It has been shown that in the case of the components produced from the alloy according to the invention under practical conditions, corrosion-induced and stress-induced cracks, possibly even dezincification, are reduced to a tolerable level.
• the alloy can be successfully processed by casting into components and semi-finished products. Especially with regard to the manufacture of valves, all casting methods are suitable, such as sand casting, centrifugal casting, low-pressure casting and chill casting.
• the sand casting can preferably be carried out under protective gas.
• the proportions of arsenic, antimony, iron, phosphorus and sulfur are to be understood in the copper alloy according to the invention as upper limit values and can be lowered to zero, if this is justifiable from an economic point of view.
• the unavoidable impurities otherwise contained in the alloy are moving within today's usual levels of contamination taking into account the increasing use of scrap.
• these proportions are further restricted in that the total impurities should not exceed 0.25% by weight, with each individual element contained as an impurity and not expressly specified in claim 1 having no more should be present as 0.02 wt .-%.
• This limitation applies in particular to a further development of the cast alloy according to the invention with a manganese content of not more than 0.2% by weight and aluminum in the limits of between 0.01% by weight and 5% by weight, in the case of silicon at most as an impurity is included.
• the unavoidable impurities may occupy up to 1% by weight of the alloy.
• aluminum may at most be contained as an impurity.
• the high copper-containing alloy according to the invention by the special combinatorial effect of the individual elements contained, in particular due to the added proportion of aluminum and / or silicon good corrosion resistance, good machinability at significantly lower release of ions, especially lead and Nickel ions, especially to drinking water shows today as common gunmetal and bronze alloys.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Insulated Conductors (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

Family

ID=34926829

Family Applications (1)

Country Status (2)

Cited By (3)

Citations (5)

• 2004
  • 2004-10-04 EP EP04023568A patent/EP1652946A1/fr not_active Withdrawn
• 2005
  • 2005-10-04 NO NO20054557A patent/NO20054557L/no not_active Application Discontinuation

Patent Citations (5)

Non-Patent Citations (2)

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