EP0572959B1 - Messinglegierung - Google Patents

Messinglegierung Download PDF

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Publication number
EP0572959B1
EP0572959B1 EP93108730A EP93108730A EP0572959B1 EP 0572959 B1 EP0572959 B1 EP 0572959B1 EP 93108730 A EP93108730 A EP 93108730A EP 93108730 A EP93108730 A EP 93108730A EP 0572959 B1 EP0572959 B1 EP 0572959B1
Authority
EP
European Patent Office
Prior art keywords
brass
alloy
samples
brass alloy
dezincification
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.)
Expired - Lifetime
Application number
EP93108730A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0572959A1 (de
Inventor
Helmut Waschke
Jürgen Stoss
Bernd Möhner
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.)
HETZEL METALLE GMBH
Hansa Metallwerke AG
Original Assignee
HETZEL METALLE GmbH
Hansa Metallwerke AG
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
Priority claimed from DE4318377A external-priority patent/DE4318377C2/de
Application filed by HETZEL METALLE GmbH, Hansa Metallwerke AG filed Critical HETZEL METALLE GmbH
Publication of EP0572959A1 publication Critical patent/EP0572959A1/de
Application granted granted Critical
Publication of EP0572959B1 publication Critical patent/EP0572959B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C22C9/04—Alloys based on copper with zinc as the next major constituent

Definitions

  • the invention relates to a brass alloy, that is to say a kneaded or cast copper-zinc alloy.
  • a brass alloy that is to say a kneaded or cast copper-zinc alloy.
  • Such alloys are used, for example, in the optical industry, the jewelry industry, in the manufacture of pumps and in the manufacture of components for drinking water or sanitary installations.
  • brass types with certain properties can be obtained. For example, it is common to add brass lead to improve machinability.
  • Such types of brass are also referred to as "automatic brass”.
  • Leaded brass grades for example Gk Ms 60 Fk, are used to manufacture components for sanitary installations, in particular water fittings.
  • Such brass alloys have the disadvantage that they are not resistant to dezincification. Under corrosive influences, the zinc is released from the grain boundary areas, first of all from the layers near the surface. As dezincing progresses into the depth of the material, the structural structure of the workpiece is increasingly changed, which has the generally known consequences. With water fittings that come into contact with relatively aggressive water, this can lead to leaks in the fitting and ultimately make it necessary to replace it.
  • the object of the invention is to provide a brass alloy in which this disadvantage does not occur. This object is achieved by a brass alloy with the composition mentioned in claim 1.
  • the alloy according to the invention is resistant to dezincification and also has mechanical properties which it is particularly suitable for the production make components suitable for water installation, such as valves and fittings.
  • FR-A-2 353 648 discloses (in claim 4) a good dezincification resistant brass alloy with 62.5-63.5% Cu, 1.3-1.6% Pb, traces of up to 0.3% Mn and Si each , 0.3-0.4% Al, 0.10-0.15% Sb, up to 0.25% Fe and Ni, 0.3-0.5% Sn, traces of Cr, Mg, As, Rest Zn.
  • the mechanical characteristics of the alloy according to the invention are comparable to the brass alloys previously used for the stated purpose.
  • the structure of the alloy according to the invention essentially has globular grains with a maximum size of approximately 100 ⁇ m.
  • a fine-grained structure is the prerequisite for a melt to be void-free, i.e. solidifies without the formation of cavities or porous, sponge-like areas.
  • the structural defects mentioned are responsible, for example, for surface defects and leaks in fittings.
  • the alloy according to the invention was subjected to a dezincification resistance test according to ISO 6509 (Corrosion of metals and alloys / Determination of decincification resistance of brass, 1981 edition). The depth of dezincification was measured in the polished section. The result of the dezincification resistance test is shown in the following table: Table 1: Dezincification depth ( ⁇ m) P1-4 ⁇ 393 P5 70 P6 100
  • the samples P1 - P4 concern a conventional brass with the following composition (in% by weight): 60.06% Cu, 1.65% Pb, ⁇ 0.010% Mn, ⁇ 0.010% Si, 0.65% Al, 0.020% Sb, 0.0008% B, 0.080% Fe, 0.030% Ni, 0.10% Sn and the remainder Zn.
  • the values for the samples P 1 - P 4 were summarized in one line and the average value of the dezincification depth was given; the maximum value was 600 ⁇ m, the minimum was 200 ⁇ m.
  • Samples P 11 to P14 are comparative samples which were cast from a conventional brass alloy with a composition corresponding to samples P1 to P4.
  • Water fittings were cast with the alloy according to the invention and processed using customary production methods. It was found that the surface of the castings has at least as good a polishability as that of fittings cast from conventional brass alloys. It no significant differences were observed when machining the castings on automatic production machines. It was possible to retain the processing and setting parameters that were previously common.
  • FIG. 1 The casting shown in FIG. 1 was used in a series of experiments. The break was carried out along the line II-II. The fault line was chosen so that it runs through a casting-critical area, in which experience has shown that structural defects occur very frequently.
  • FIG. 2 shows a 10-fold enlargement of the break point of a specimen made from a conventional brass alloy.
  • a spongy loosened area marked L can be clearly seen, which extends almost over the entire thickness D of the cast part wall. Such areas can later lead to leaks. If the areas extend across the entire thickness of a partition, there is a leak from the start in the case of a water fitting.
  • 3 shows the breaking point of a specimen cast with the alloy according to the invention. It can be clearly seen that there is a continuously fine-grained and dense structure. A total of ten samples were examined in each case. Sponge-like areas as shown in FIG. 2 occurred in 5 of the comparison samples. The samples from the alloy according to the invention were always free from the structural defects mentioned.
  • the structure of the alloy according to the invention has approximately globulitic grains with a maximum size of 100 ⁇ m.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Adornments (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Soft Magnetic Materials (AREA)
  • Mechanical Operated Clutches (AREA)
  • Contacts (AREA)
EP93108730A 1992-06-02 1993-05-29 Messinglegierung Expired - Lifetime EP0572959B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4218514 1992-06-02
DE4218514 1992-06-02
DE4318377A DE4318377C2 (de) 1992-06-02 1993-05-28 Messinglegierung
DE4318377 1993-05-28

Publications (2)

Publication Number Publication Date
EP0572959A1 EP0572959A1 (de) 1993-12-08
EP0572959B1 true EP0572959B1 (de) 1997-02-19

Family

ID=25915427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93108730A Expired - Lifetime EP0572959B1 (de) 1992-06-02 1993-05-29 Messinglegierung

Country Status (4)

Country Link
EP (1) EP0572959B1 (es)
AT (1) ATE149042T1 (es)
AU (1) AU664092B2 (es)
ES (1) ES2099863T3 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE514752C2 (sv) 1999-08-26 2001-04-09 Tour & Andersson Hydronics Ab Avzinkningsbeständig mässingslegering för pressgjutning
DE10158130C1 (de) * 2001-11-27 2003-04-24 Rehau Ag & Co Verwendung einer korrosionsbeständigen Kupfer-Zink-Legierung für Trinkwasserformteile
DE10308778B3 (de) 2003-02-28 2004-08-12 Wieland-Werke Ag Bleifreie Kupferlegierung und deren Verwendung
CN101451204B (zh) * 2008-12-15 2010-10-13 无锡吉泉五金机械有限公司 汽车空调用导向球及其制备方法
DE102013004081B4 (de) * 2013-03-11 2023-06-07 Hansa Metallwerke Ag Sanitärer Armaturenkörper

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH540342A (de) * 1970-08-20 1973-08-15 Olof Manner Ab Kupfer-Zinklegierung
DE2159482A1 (de) * 1971-12-01 1973-06-07 Schreiber Gmbh Carl Verwendung einer gusslegierung aus sondermessing
FR2353648A1 (fr) * 1976-05-31 1977-12-30 Afica Alliage de laiton biphase pour fonderie presentant des proprietes ameliorees de mise en oeuvre et une tres bonne resistance des pieces coulees a la dezincification
SE8800931D0 (sv) * 1988-03-16 1988-03-16 Tour & Andersson Ab Messingslegering och sett att framstella densamma

Also Published As

Publication number Publication date
ATE149042T1 (de) 1997-03-15
AU4000493A (en) 1993-12-09
ES2099863T3 (es) 1997-06-01
EP0572959A1 (de) 1993-12-08
AU664092B2 (en) 1995-11-02

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