WO2023138974A1 - Composants pour tuyaux d'eau potable et leur procédé de fabrication - Google Patents

Composants pour tuyaux d'eau potable et leur procédé de fabrication Download PDF

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Publication number
WO2023138974A1
WO2023138974A1 PCT/EP2023/050613 EP2023050613W WO2023138974A1 WO 2023138974 A1 WO2023138974 A1 WO 2023138974A1 EP 2023050613 W EP2023050613 W EP 2023050613W WO 2023138974 A1 WO2023138974 A1 WO 2023138974A1
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alloy
mpa
components
weight percentage
accordance
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PCT/EP2023/050613
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English (en)
Inventor
Mateusz SZKLAREK
Slawomir WOLINSKI
Manouchehr SALEHI BAKHTIARI
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Conex Ipr Limited
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Publication of WO2023138974A1 publication Critical patent/WO2023138974A1/fr

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/025—Casting heavy metals with high melting point, i.e. 1000 - 1600 degrees C, e.g. Co 1490 degrees C, Ni 1450 degrees C, Mn 1240 degrees C, Cu 1083 degrees C
    • 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

  • Components suitable for plumbing installations for example for drinking water pipes, and methods for manufacturing same are provided.
  • Such components include for example, coupling parts, angular parts, elbow parts, T-piece parts, distributor parts, fittings and valves.
  • the components may also find utility in other plumbing applications such as in central heating, ventilation or air-conditioning systems.
  • Copper-tin alloys such as CC499K (EN symbol for casting is CuSn5Zn5Pb2-C), which comprises 84 wt% to 88 wt% Cu, 4 wt% to 6 wt% Sn, 4 wt% to 6 wt% Zn, 3 wt% Pb and 0.10 W Sb, have been widely used to form plumbing components.
  • This alloy has good mechanical and machining properties.
  • CC499K is suitable for sand casting, die casting, centrifugal casting and continuous casting.
  • CC499K has a tensile strength of about 220 MPa and an elongation of about 13% according to BE EN 1982. The 0.2% proof stress is 110 MPa.
  • EP1446510 discloses use of a non-corrosive copper-zinc alloy for drinking water shaped parts.
  • EP1446510 describes a corrosion-resistant copper-zinc alloy for drinking water moulded parts, which is composed of the following alloy components: a) 23 to 32 wt% zinc; b) 0.01 to 0.3 wt% at least one of the elements tin, iron, nickel, aluminium and silicon; c) 0.7 to 1 .5 wt% lead; d) balance copper including production-related impurities as a material for the production, and the residual copper content being based on the sum of the components of the respective mixture components in a) to c).
  • US patent application publication number US2007158004 relates to a method for producing components, such as fittings, valves, and pipes suitable for conveying media- or drinking water, which components purportedly exhibit low migration of metal ions into the medium.
  • the method involves continuously casting an ingot or rod from a copper alloy wherein the alloy has the following components in wt%: 2 wt% ⁇ Si ⁇ 4.5 wt%, 1 wt% ⁇ Zn ⁇ 17 wt%, 0.05 wt% ⁇ Mn ⁇ 0.6 wt%, unavoidable accompanying elements to a maximum of 0.5 wt% in total, preferably to a maximum of 0.3 wt% in total , the remainder is copper and the ingot or the rod for producing the component is subjected at least to one cold and/or hot forming process.
  • US2007158004 includes a single example composition which comprises 3.5 wt% Si, 1 .6 wt% Zn and 0.5 wt% Mn, unavoidable accompanying elements are present to a maximum of 0.5 wt% and the remainder is copper.
  • the exemplified composition had lower lead, nickel, copper and zinc release than a red brass alloy comprising 5.5 wt% Zn, 4.5 wt% Sn, 3 wt% Pb, 0.5 wt% Ni and the remainder being copper.
  • the tensile strength of such copper alloys is approximately 300 MPa, and the elongation is approximately 16%.
  • the alloy does not have good machinability and cannot be used for forming.
  • European patent number EP1045041 discloses and claims a lead-free free-cutting copper alloy which comprises 69 to 79 percent, by weight, of copper; 2.0 to 4.0 percent, by weight, of silicon; at least one element selected from among 0.02 to 0.4 percent, by weight, of bismuth, 0.02 to 0.4 percent, by weight, of tellurium, and 0.02 to 0.4 percent, by weight, of selenium; and the remaining percent, by weight, of zinc.
  • EP1045041 discloses copper alloys comprising approximately 16 wt% to approximately 29 wt% zinc.
  • the copper alloy of EP1045041 has been criticised with respect to corrosion resistance, in addition, the alloys contain elements which are not suitable for drinking water pipes.
  • US patent application publication number US2009/0214380 discloses and claims the use of a copper alloy for the manufacture of components for gas or water lines which carry media, in particular drinking water lines as well as fittings and valves of the same, wherein the copper alloy comprises, in wt%: 2.8 ⁇ Si ⁇ 4.5; 1 ⁇ Zn ⁇ 15; 0.05 ⁇ Mn ⁇ 2; 80 ⁇ Cu ⁇ 96.95 optionally further comprising: 0.05 ⁇ AI ⁇ 0.5; 0.05 ⁇ Sn ⁇ 2; 0.0005 ⁇ Zr ⁇ 0.05; 0.01 ⁇ P ⁇ O.2; and unavoidable impurities.
  • US patent application publication number US2008/0318079 discloses plumbing valves, fittings and other water handling devices manufactured of silicon bronze having a lead content below 0.2%.
  • the silicon bronze alloy described therein C87800 consists of in wt%:
  • a preferred C87800 alloy comprised about 82wt% copper, 4wt% silicon and 14wt% zinc.
  • the silicon bronze alloy C87610 may be used:
  • a preferred C87610 alloy comprises about 92wt% copper, about 4wt% silicon and about 4 wt% zinc.
  • C87800 has an elongation of up to about 25%, and C87610 has an elongation of up to about 20%.
  • the present invention provides a Cu-Zn-Si alloy comprising, consisting essentially of, or consisting of the following components in weight percent:
  • the Cu-Zn-Si alloy comprises in weight percent no more than 0.05% Ni; wherein the Cu-Zn-Si alloy comprises no more than 0.2 wt% Al; wherein the Cu-Zn-Si alloy comprises no more than 0.03 wt% P; wherein the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.2 wt% Sn, and no more than 0.06 wt% Pb; and wherein the balance is copper, for example, 82.0 ⁇ Cu ⁇ 86.3, suitably 82.0 ⁇ Cu ⁇ 86.0, such as 82.0 ⁇ Cu ⁇ 85.8, preferably 82.0 ⁇
  • the Cu-Zn-Si alloy comprises in weight percent: 2.5 ⁇ Si ⁇ 3.5.
  • the Cu-Zn-Si alloy may comprise in weight percent: 2.5 ⁇ Si ⁇ 3.2; and 36 ⁇ Q ⁇ 47, preferably 38 ⁇ Q ⁇ 45, such as from 38 ⁇ Q ⁇ 42.
  • Such a silicon content and Q value are particularly advantageous when the alloy is continuously cast.
  • the Cu-Zn-Si alloy comprises in weight percent: 2.5 ⁇ Si ⁇ 3.2; and 36 ⁇ Q ⁇ 47, preferably 38 ⁇ Q ⁇ 45, such as from 38 ⁇ Q ⁇ 42, and said alloy is continuously cast.
  • the Cu-Zn-Si alloy may comprise in weight percent:
  • the Cu-Zn-Si alloy may comprise in weight percent:
  • the Cu-Zn-Si alloy comprises a zinc content in the range:
  • the Cu-Zn-Si alloy may comprise a manganese content in the range:
  • 0.1 ⁇ Mn ⁇ 0.15 preferably in the range: 0.10 ⁇ Mn ⁇ 0.14.
  • the Cu-Zn-Si alloy is free of As and/or Sb.
  • the Cu-Zn-Si alloy may have a tensile strength as determined in accordance with ISO 6892-1 :2009 of 350 MPa or more, preferably 380 MPa or more, even more preferably 400 MPa or more, such as 450 MPa or more.
  • the Cu-Zn-Si alloy has a true solid state density in the range of from 8.0 kg/m 3 to 8.29 kg/m 3 , preferably from 8.0 to 8.28 kg/m 3 , suitably from 8.18 to 8.28 kg/m 3 .
  • the true solid state density may be measured in accordance with BS ISO 12154.
  • the present invention provides components for drinking-water pipes, namely valves and fittings for same, manufactured from a Cu-Zn-Si alloy described herein which comprises, consists essentially of or consists of the following in weight percent:
  • Q [Zn] + (10 x [Si]), wherein 36 ⁇ Q ⁇ 48;
  • the Cu-Zn-Si alloy comprises in weight percent no more than 0.05% Ni; wherein the Cu-Zn-Si alloy comprises no more than 0.2 wt% Al; wherein the Cu-Zn-Si alloy comprises no more than 0.03 wt% P; wherein the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.2 wt% Sn, and no more than 0.06 wt% Pb; and wherein the balance is copper, for example
  • the present invention provides a method for manufacturing components for drinking-water pipes, namely valves and fittings for same, comprising:
  • Processing said alloy to form components as described herein may include continuous casting said alloy, and/or one or more metal forming steps.
  • Processing said alloy to form components as described herein may include gravity casting said alloy, for example sand casting or die casting said alloy.
  • Processing said alloy to form components as described herein may include pressurised die casting, e.g. high-pressure die casting.
  • Processing said alloy to form components as described herein may include one or more metal forming steps, for example forging or rolling said alloy.
  • Processing said alloy to form components as described herein may include one or more machining steps.
  • the processing of the Cu-Zn-Si alloy may involve heating the copper alloy to a temperature in the range of from 800 to 1300°C, preferably from 1000°C to 1300°C in one or more processing steps.
  • the Cu-Zn-Si alloy may be heated to a temperature in the range of from 1000°C to 1150°C.
  • the Cu-Zn- Si alloy may be heated to a temperature in the range of from 1200°C to 1300°C.
  • the Cu-Zn-Si alloy comprises in weight precent: 2.5 ⁇ Si ⁇ 3.2; and suitably 36 ⁇ Q ⁇ 47, preferably 38 ⁇ Q ⁇ 45, such as 38 ⁇ Q ⁇ 42.
  • the Cu-Zn-Si alloy comprises in weight percent: 2.7 ⁇ Si ⁇ 3.5; and suitably 37 ⁇ Q ⁇ 48, preferably 40 ⁇ Q ⁇ 46; such as from 40 ⁇ Q ⁇ 44.
  • the Cu-Zn-Si alloy has a tensile strength as determined in accordance with ISO 6892- 1 :2009 of 350 MPa or more, preferably 380 MPa or more, even more preferably 400 MPa or more, such as 450 MPa or more.
  • the present disclosure also provides, a Cu-Zn-Si alloy comprising, consisting essentially of or consisting of the following components in weight percent:
  • 0.1 ⁇ Fe s 0.5; optionally, 0.1 ⁇ Mn ⁇ 0.2; wherein the sum of the weight percentage of Zn and ten times the weight percentage of Si amounts to a combined weight percentage Q, where Q [Zn] + (10 x [Si]), wherein 35 ⁇ Q ⁇ 52; wherein the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.2 wt% Sn, and no more than 0.06 wt% Pb.
  • components for drinking-water pipes namely valves and fittings for same, manufactured from a Cu-Zn-Si alloy comprising the following components in weight percent:
  • 0.1 ⁇ Fe s 0.5; optionally, 0.1 ⁇ Mn ⁇ 0.2; wherein the sum of the weight percentage of Zn and ten times the weight percentage of Si amounts to a combined weight percentage Q, where Q [Zn] + (10 x [Si]), wherein 35 ⁇ Q ⁇ 52; wherein the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.2 wt% Sn, and no more than 0.06 wt% Pb.
  • the present disclosure provides a method for manufacturing components for drinking-water pipes, namely valves and fittings for same, comprising:
  • the Cu-Zn-Si alloy of the present disclosure may comprise in weight percent:
  • the amount of copper in the Cu-Zn-Si alloy of the present invention is in the range of from 82.2 ⁇ Cu ⁇ 85.0, or 82.5 ⁇ Cu ⁇ 84.5, such as 83.0 ⁇ Cu ⁇ 84.5.
  • the Cu-Zn-Si alloy may for example comprise in weight percent: 2.5 ⁇ Si ⁇ 3.7, preferably
  • the Cu-Zn-Si alloy may have a tensile strength as determined in accordance with ISO 6892-1 :2009 of 300 MPa or more, preferably 350 MPa or more, even more preferably 380 MPa or more, even more preferably 400 MPa or more, such as 450 MPa or more.
  • the Cu-Zn-Si alloy may have a tensile strength in the range of from 300 MPa to 650 MPa, such as from 350 MPa to 650 MPa, preferably 380 MPa to 600 MPa as determined in accordance with ISO 6892-1 :2009, for example from 400 MPa to 600 MPa, such as from 450 MPa to 600 MPa.
  • the Cu-Zn-Si alloy suitably has an elongation at fracture of 15% or more, suitably 20% or more, preferably 25% or more as determined in accordance with ISO 6892-1 :2009, such as 30% or more, or 35% or more.
  • the Cu-Zn-Si alloy may have an elongation at fracture in the range of from 25% to 65%, such as from 30% to 60%, or 35% to 60%.
  • the Cu-Zn-Si alloy may have a tensile strength of 350 MPa or more and an elongation at fracture of 25% or more as determined in accordance with ISO 6892-1 :2009.
  • the Cu-Zn-Si alloy has a tensile strength of 380 MPa or more and an elongation at fracture in the range of from 25% to 65%.
  • the Cu-Zn-Si alloy (and components made therefrom) has a tensile strength of from 380 MPa to 650 MPa, such as from 400 to 600 MPa, or 450 MPa to 600 MPa and the elongation at fracture is 25% to 65%, such as 30% to 60% or 35% to 60% as determined in accordance with ISO 6892- 1 :2009.
  • the Cu-Zn-Si alloy comprises no more than 0.1 wt% Sn, more suitably, no more than 0.06 wt% Sn.
  • the Cu-Zn-Si alloy comprises in weight percent no more than 0.05% Ni.
  • the Cu-Zn-Si alloy may comprise up to 0.2 wt% Al, e.g. 0.001 wt% to 0.2 wt% Al.
  • the Cu-Zn-Si alloy may comprise up to 0.03 wt% P, e.g. 0.001 wt% to 0.03 wt% P.
  • the Cu-Zn-Si alloy is free of As.
  • the Cu-Zn-Si alloy may alternatively or additionally be free of one or more of Sb, Bi, Te and Se.
  • the Cu-Zn-Si alloy may be free of As, Sb, Bi, Te and Se.
  • a Cu-Zn-Si alloy comprising, consisting essentially of, or consisting of the following components in weight percent:
  • the Cu-Zn-Si alloy is particularly suitable for manufacture of components such as plumbing fittings, for example, components for drinking water pipes i.e. pipes suitable for conveying drinking water or other media for human consumption for example, coupling parts, angular parts, elbow parts, T-piece parts, distributor parts, fittings and valves.
  • components may also be used in other plumbing settings, for example in central heating, ventilation or air-conditioning systems.
  • the components are lead free and have low ion migration into media such as drinking water which is conveyed through the components.
  • the zinc content of 11 .0 wt% to 13.0 wt% influences elongation and tensile strength. If the zinc content is lower than about 11 wt%, the elongation is reduced. If the zinc content exceeds about 13 wt% the tensile strength deteriorates. In some embodiments, the zinc content is in the range of from 11 .5 wt% to 13.0 wt%, such as from 12.0 wt% to 13.0 wt%.
  • the silicon content of 2.5 wt% to 3.7 wt% influences corrosion resistance, castability, and abrasion resistance.
  • the corrosion rate may be between 0.02 and 0.002 mm/year as determined in accordance with ISO 16151 :2018. If the silicon content is lower than about 2.5 wt%, these properties are reduced. If the silicon content exceeds about 3.7 wt% these properties deteriorate. In some embodiments, the silicon content is in the range of from 2.5 wt% to 3.5 wt%.
  • the relationship between the zinc content and the silicon content significantly influences tensile strength and elongation when the alloy is processed under different processing conditions.
  • one aspect of the present invention provides components for drinking water pipes, namely valves and fittings for same, manufactured by continuous casting or metal forming a Cu-Zn-Si alloy comprising the following components in weight percent:
  • Q [Zn] + (10 x [Si])
  • 2.7 ⁇ Si ⁇ 3.5 such 2.8 ⁇ Si ⁇ 3.2
  • 37 ⁇ Q ⁇ 48 preferably 40 ⁇ Q ⁇ 46.
  • Q is less than about 37 a reduction in tensile strength is observed, whereas if Q is greater than about 48, a reduction in elongation is observed.
  • Q is in the range of from about 40 wt% to about 46 wt%, optimal elongation and tensile strength is achieved for gravity castings.
  • another aspect of the invention provides components for drinking water pipes, namely valves and fittings for same, manufactured by gravity casting, such as sand casting or die casting, a Cu-Zn-Si alloy of the present invention comprising the following components in weight percent:
  • the Cu-Zn-Si alloy of the present invention comprises iron in an amount of from 0.1 wt% to 0.5 wt%.
  • the amount of iron is lower than about 0.1 wt% cracking proneness when heated increases, ductility reduces and the fine-grained uniform structure is not observed. If the amount of iron is greater than about 0.5 wt% cracking proneness when heated increases, ductility reduces and the fine-grained uniform structure is not observed.
  • the Cu-Zn-Si alloy of the present invention comprises manganese in an amount of 0.1 wt% to 0.2 wt%.
  • the amount of manganese is less than about 0.1 wt% a reduction in corrosion resistance is observed. If the amount of manganese is greater than about 0.2 wt% a reduction in corrosion resistance is observed.
  • the amount of manganese is suitably in the range of from 0.1 wt% to 0.15 wt%, preferably in the range of from 0.1 wt% to 0.14 wt%. Elongation at fracture is advantageously further enhanced when the amount of manganese is within this range.
  • the content of the four main alloying elements i.e. Zn, Si, Fe and Mn, and excluding copper is between 13.7 and 16.9 wt%, such as from 13.7 and 16.6 wt% for components manufactured using continuous casting or metal forming.
  • the content of the four main alloying elements i.e. Zn, Si, Fe and Mn, and excluding copper is between 13.9 and 17.3 wt%, such as from 14.1 to 17.3 wt% or 13.9 and 17.2 wt% for components manufactured using gravity casting, such as sand casting or die casting.
  • the components of the invention are Cu-Zn-Si alloy casting components, such as Cu-Zn- Si alloy: continuous castings, gravity castings, sand castings, or die castings.
  • the methods described herein may include one or more annealing steps.
  • annealing can enhance the ductility of the Cu-Zn-Si alloy, and components made therefrom.
  • the Cu-Zn-Si alloy may be annealed by heating to a temperature in the range of from 700 to 900 °C.
  • the weight of the components of the alloys of the invention add up to 100 wt%, thus for example, when a composition specifies the balance is copper, this means that the remainder of the composition to make up 100 wt% is copper i.e. the balance is copper up to 100 wt%.
  • Components for drinking-water pipes namely valves and fittings for same, manufactured from a Cu-Zn-Si alloy comprising the following components in weight percent:
  • a method for manufacturing components for drinking-water pipes comprising:
  • step (ii) includes continuous casting said alloy, and/or wherein step (ii) includes one or more metal forming steps.
  • step (ii) includes gravity casting said alloy, for example sand casting or die casting said alloy. 5. The method of embodiment 2, wherein step (ii) includes one or more metal forming steps, for example forging or rolling said alloy.
  • step (ii) further includes one or more machining steps.
  • step (ii) involves heating the Cu-Zn-Si alloy to a temperature in the range of from 800 to 1300°C, in one or more processing steps.
  • 2.5 ⁇ Si ⁇ 3.5 such as from 2.5 ⁇ Si ⁇ 3.2; and where 36 ⁇ Q ⁇ 47, preferably 38 ⁇ Q ⁇ 45, such as from 38 ⁇ Q ⁇ 42.
  • a Cu-Zn-Si alloy comprising, consisting essentially of, or consisting of the following components in weight percent:
  • Cu-Zn-Si alloy having a tensile strength as determined in accordance with ISO 6892- 1 :2009 of 300 MPa or more; preferably 400 MPa or more, and said alloy having an elongation at fracture of 25% or more, preferably 30% or more, more preferably 40% or more as determined in accordance with ISO6892-1 :2009.
  • Components for drinking-water pipes namely valves and fittings for same, manufactured from a Cu-Zn-Si alloy comprising, consisting essentially of or consisting of the following in weight percent:
  • the Cu-Zn-Si alloy comprises in weight percent no more than 0.05% Ni; wherein the Cu-Zn-Si alloy comprises no more than 0.2 wt% Al; wherein the Cu-Zn-Si alloy comprises no more than 0.03 wt% P; wherein the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.2 wt% Sn, and no more than 0.06 wt% Pb; and wherein the balance is copper, for example, 82.0 ⁇ Cu ⁇ 86.3, suitably
  • a method for manufacturing components for drinking-water pipes comprising:
  • step (ii) includes continuous casting said alloy, and/or wherein step (ii) includes one or more metal forming steps.
  • step (ii) includes gravity casting said alloy, for example sand casting or die casting said alloy.
  • step (ii) includes one or more metal forming steps, for example forging or rolling said alloy.
  • step (ii) further includes one or more machining steps.
  • a rod was continuously cast from a Cu-Zn-Si alloy of the present invention comprising:
  • the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.06 wt% Sn, and no more than 0.06 wt% Pb.
  • Example 1 contained 0.010 ⁇ Ni ⁇ 0.025
  • Example 1 The composition of Example 1 was free of Bi, Ag, Te and As.
  • the amount of copper was in the range of from 82.0 to 85.0 wt% based on the total weight of the alloy.
  • Ingots having an alloy composition as specified above were loaded into a furnace capable of smelting and casting.
  • the alloy was heated to a temperature in the range of from 1000 to 1200°C, and the smelt is cast through graphite dies with copper coolers.
  • the liquid metal is cooled and drawn as a continuous rod or tube.
  • the tubes are cut to size and are conveyed to a stamping station and/or a machining station.
  • the continuously cast rod is cut into billets of a particular size (size varies depending on the amount of material required to manufacture the end component part).
  • the billets may then be heated and forged.
  • After forging the stamp is cooled and trimmed.
  • the stamp may optionally be annealed, for example by heating to a temperature in the range of from 700 to 900°C.
  • the stamp is cleaned and then sent to a machining station.
  • Elongation sensor type extensometer
  • FIG. 1 A cross section of the continuously cast rod of Example 1 is shown in Figure 1 .
  • Figure 2 shows a magnified image of Figure 1. Captured using 5XJP-6A Metallurgical Microscope20x lens Microscope camera DLT-Cam PRO with samples from a 026 rod in an Acid mixture: HCI (20%) : H2NO3 (20%): H2SO4 (20%)1 : 2.
  • Figure 3 shows the ends of the continuously cast Cu-Zn-Si alloy rod of example 1 having been extended to break in the extensometer.
  • Example 2 A rod was continuously cast from a Cu-Zn-Si alloy of the present invention having the following composition: 82 ⁇ Cu ⁇ 86.5
  • the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.06 wt% Sn, and no more than 0.05 wt% Pb.
  • Example 2 contained 0.010 ⁇ Ni ⁇ 0.025.
  • Example 2 The composition of Example 2 was free of Bi, Ag, Te and As.
  • the amount of copper was in the range of from 82.0 to 85.0 wt% based on the total weight of the alloy.
  • the continuously cast rod was processed as descried in Example 1 .
  • Elongation sensor type extensometer
  • Figure 4 shows a cross section of a continuously cast rod according to Example 2.
  • the Cu-Zn-Si alloy of the invention when continuously cast, had significantly superior tensile strengths and elongation at fracture properties in comparison to prior art continuous castings.
  • continuous castings had a tensile strength of 380 MPa or more, preferably 400 MPa or more, even more preferably 450 MPa or more as determined in accordance with ISO 6892-1 :2009.
  • continuous castings of the present invention had a percentage elongation at fracture of 25% or more, preferably 30% or more, even more preferably 40% or more as determined in accordance with ISO 6892-1 :2009.
  • continuous castings had a percentage elongation at fracture in the range of 25% to 65%, such as from 35% to 60% as determined in accordance with ISO 6892-1 :2009.
  • the Cu-Zn-Si alloy of the present invention and continuous castings made therefrom have a tensile strength of 380 MPa or more, and an elongation at fracture in the range of from 25% to 65%, preferably, the tensile strength is in the range of from 380 MPa to 650 MPa, preferably from 400 MPa to 600, such as from 450 MPa to 600 MPa, and the elongation at fracture is 25% to 65%, such as 35% to 60% as determined in accordance with ISO 6892-1 :2009.
  • a rod was gravity die cast from a Cu-Zn-Si alloy of the present invention having the following composition:
  • the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.06 wt% Sn, and no more than 0.06 wt% Pb.
  • Example 3 contained 0.010 ⁇ Ni ⁇ 0.025.
  • Example 3 The composition of Example 3 was free of Bi, Ag and As.
  • Ingots having an alloy composition as specified above were loaded into a furnace capable of smelting and casting.
  • the alloy was heated to a temperature in the range of from 1000 to 1300°C, suitably between 1150 and 1300°C.
  • chemical composition may be monitored and controlled to ensure the composition is maintained.
  • some elements e.g. Zn and P
  • evaporate or go to slag they must be replaced to keep the required composition of the present invention.
  • the smelted metal is transported and poured into a holding furnace, and subsequently cast into a die casting.
  • the liquid metal is cooled in the die (for example with air cooling or water cooling) and once solidified the die is opened and the rod is released.
  • the Cu-Zn-Si alloy of the present invention has enhanced tensile strength and elongation properties in comparison to prior art Cu-Zn-Si alloys. The enhanced properties increase the processing ease of the alloy.
  • the casting had a tensile strength of >380 MPa, and an elongation at fracture of >25% as determined in accordance with ISO 6892-1 :2009.
  • the Cu-Zn-Si alloys of the examples had a manganese content in the range: 0.10 ⁇ Mn ⁇ 0.14; the alloys of the invention advantageously have even further enhanced elongation when the amount of manganese is in this preferred range.
  • the true solid state density of the Cu-Zn-Si alloys of the examples described herein was in the range of from 8.18 to 8.28 Kg/m 3 as measured in accordance with BS ISO 12154.
  • BS ISO 12154 defines true solid state density as the ratio of the sample mass to the volume of the compact solid skeleton of the sample which excludes the volume of open and closed pores or internal voids and also interparticle voids as in the case of granulated or highly dispersed samples.
  • a rod was cast from a Cu-Zn-Si alloy having the following compositions:
  • CE1 comprises >13 wt% Zn, and despite containing 0.136 wt% Pb, has low tensile strength and low.
  • CE2 comprises ⁇ 11 wt% Zn, > 4.1 wt% Si and had an excellent tensile strength. However, the alloy was very brittle (see Figure 7). Hence, suitable the alloy of CE2 did not have suitable elongation properties.
  • CE3 comprises >4.1 wt% Si and has a Q of >52 wt%.
  • the tensile strength was excellent however, the elongation was not suitable.
  • the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.06 wt% Sn, and no more than 0.06 wt% Pb.
  • Example 3 contained 0.010 ⁇ Ni ⁇ 0.025.
  • Example 3 The composition of Example 3 was free of Bi, Ag and As.
  • the Cu-Zn-Si alloy of comparative example 4 had a tensile strength of 363.6 MPa, and an elongation at fracture of 16%.
  • the Cu-Zn-Si alloy of comparative example 4 had a Q of approximately 50.
  • Figure 5 shows a cross section of the rod cast in Comparative Example 4.
  • the grain is uniform/homogenous, however, the elongation of the rod cast in comparative example 4, was 16%.
  • Figure 6 shows the ends of the die cast Cu-Zn-Si alloy rod of comparative example 4 having been extended to break in the extensometer.
  • Cu-Zn-Si alloys according to the invention which have Q in the range: 36 ⁇ Q ⁇ 48, and for gravity cast Cu-Zn-Si alloys of the invention preferably 40 ⁇ Q ⁇ 46, and for continuous cast Cu-Zn-Si alloys of the invention preferably 38 ⁇ Q ⁇ 45, have elongation at fracture of 25% or more as determined in accordance with ISO6892-1 :2009.
  • a rod was continuously cast from a Cu-Zn-Si alloy of the present invention as described in Examples 1 and 2, the Cu-Zn-Si alloy of example 4 had the following composition:
  • the alloy includes unavoidable impurities in an amount of 0.53 wt% or less, wherein said impurities contain no more than 0.06 wt% Sn, and no more than 0.06 wt% Pb.
  • Example 4 contained 0.010 ⁇ Ni ⁇ 0.025
  • Example 1 The composition of Example 1 was free of Bi, Ag, Te and As.
  • the Cu-Zn-Si alloy of the present invention has greater ductility, and in particular has a greater elongation at fracture as determined in accordance with ISO6892-1 :2009.
  • the alloy of the present invention has a lower density than the prior art alloy.
  • the alloy of the present invention is a lighter weight alloy, but has the similar tensile strength performance, and greater elongation properties than the prior art alloy.
  • the alloy of the present invention will have less distribution cost, per metre cubed, and from an environmental standpoint, will be more economical to transport per metre.
  • the alloy of the present invention has a true solid state density in the range of from 8.0 kg/m 3 to 8.29 kg/m 3 , preferably from 8.0 to 8.28 kg/m 3 , suitably from 8.18 to 8.28 kg/m 3 .
  • the alloys of the comparative examples have a true solid state density of 8.30 kg/m 3 or higher.
  • the alloy of the present invention may be processed in each of the fabrication processes described above, whereas the prior art C87800 alloy is not suitable for sand mould casting, continuous casting, hot forged and air cooled processes, or hot forged and quenched processes.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Domestic Plumbing Installations (AREA)
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Abstract

L'invention concerne un alliage Cu-Zn-Si ayant une faible teneur en plomb, ainsi que des composants tels que des raccords de plomberie appropriés pour des tuyaux d'eau potable, et des procédés de fabrication de ceux-ci.
PCT/EP2023/050613 2022-01-18 2023-01-12 Composants pour tuyaux d'eau potable et leur procédé de fabrication WO2023138974A1 (fr)

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GB2200575.5A GB2614752A (en) 2022-01-18 2022-01-18 Components for drinking water pipes, and method for manufacturing same
GB2200575.5 2022-01-18

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1045041A1 (fr) 1998-10-12 2000-10-18 Sambo Copper Alloy Co., Ltd Alliage de cuivre de decolletage sans plomb
EP1446510A1 (fr) 2001-11-27 2004-08-18 REHAU AG + Co Utilisation d'un alliage cuivre-zinc resistant a la corrosion pour produire des pieces faconnees destinees au domaine de l'eau potable
EP1452613A2 (fr) * 2003-02-28 2004-09-01 Wieland-Werke AG Alliage de cuivre sans plomb et son utilisation
US20070158004A1 (en) 2005-12-22 2007-07-12 Winfried Reif Low-migration components, media- or drinking-water carrying works
US20080318079A1 (en) 2007-06-21 2008-12-25 Ballantyne George J Low lead solderable plumbing components
US20090214380A1 (en) 2005-12-14 2009-08-27 Gebr. Kemper Gmbh & Co. Kg Metallwerke Low-migration copper alloy
EP2952596A1 (fr) * 2013-02-01 2015-12-09 Xiamen Lota International Co., Ltd. Alliage de laiton sans plomb, facile à découper et résistant à la corrosion avec une bonne performance de thermoformage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1045041A1 (fr) 1998-10-12 2000-10-18 Sambo Copper Alloy Co., Ltd Alliage de cuivre de decolletage sans plomb
EP1446510A1 (fr) 2001-11-27 2004-08-18 REHAU AG + Co Utilisation d'un alliage cuivre-zinc resistant a la corrosion pour produire des pieces faconnees destinees au domaine de l'eau potable
EP1452613A2 (fr) * 2003-02-28 2004-09-01 Wieland-Werke AG Alliage de cuivre sans plomb et son utilisation
US20090214380A1 (en) 2005-12-14 2009-08-27 Gebr. Kemper Gmbh & Co. Kg Metallwerke Low-migration copper alloy
US20070158004A1 (en) 2005-12-22 2007-07-12 Winfried Reif Low-migration components, media- or drinking-water carrying works
US20080318079A1 (en) 2007-06-21 2008-12-25 Ballantyne George J Low lead solderable plumbing components
EP2952596A1 (fr) * 2013-02-01 2015-12-09 Xiamen Lota International Co., Ltd. Alliage de laiton sans plomb, facile à découper et résistant à la corrosion avec une bonne performance de thermoformage

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