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WO2016039610A1 - Alliage de cuivre à faible teneur en plomb pour la fabrication de produits hydrauliques pour la basse pression - Google Patents

Alliage de cuivre à faible teneur en plomb pour la fabrication de produits hydrauliques pour la basse pression Download PDF

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Publication number
WO2016039610A1
WO2016039610A1 PCT/MX2015/000123 MX2015000123W WO2016039610A1 WO 2016039610 A1 WO2016039610 A1 WO 2016039610A1 MX 2015000123 W MX2015000123 W MX 2015000123W WO 2016039610 A1 WO2016039610 A1 WO 2016039610A1
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WO
WIPO (PCT)
Prior art keywords
alloy
alloys
copper
lead
low
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.)
Ceased
Application number
PCT/MX2015/000123
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English (en)
Spanish (es)
Inventor
Juan Carlos RAMIREZ URREA
Raúl URREA VILLASEÑOR
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.)
Asesoria Y Desarrollos Urrea SA de CV
Original Assignee
Asesoria Y Desarrollos Urrea SA de CV
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
Application filed by Asesoria Y Desarrollos Urrea SA de CV filed Critical Asesoria Y Desarrollos Urrea SA de CV
Publication of WO2016039610A1 publication Critical patent/WO2016039610A1/fr
Anticipated expiration legal-status Critical
Priority to CONC2017/0002987A priority Critical patent/CO2017002987A2/es
Ceased 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 present invention relates to an alloy of copper (Cu) - zinc (Zn), with additional alloying elements, such as lead (Pb), silicon (Si) and low-cost aluminum (Al), which as a whole provide to the alloy superior fluidity properties, in addition to high performance in forging, continuous casting and other processes with temperatures above 650 ° C.
  • additional alloying elements such as lead (Pb), silicon (Si) and low-cost aluminum (Al)
  • copper alloys have a strong challenge to meet these types of standards because lead is the element that copper alloys contain, for example brass and bronze, to improve their performance in cutting operations as well as machining, and facilitate the manufacture of these metals.
  • the present invention provides an improved alloy that meets this characteristic of low lead content (0.25% Pb maximum) and at the same time provides good mechanical, metallurgical and electrochemical properties for processing and application in sustainable products that are in contact with the water
  • Copper alloys have been successfully replacing the influence of lead on the alloy, adding elements such as: bismuth (Bi), tellurium (Te), tellurium sulfate, niobium (Nb), etc.
  • US Patent No. 7883589 of the inventor Keiichiro Oishi of the holder Mitsubishi Shindoh Co. LTD entitled "FREE-CUTTING COPPER ALLOY CONTAINING VERY LOW LEAD” describes a "copper alloy that has a small amount of lead in LEAD "describes a" copper alloy that contains a small amount of lead compared to other conventional cutting, but provides an industrially satisfactory machining capacity. It also describes that fast cutting alloys contain 71.5 to 78.5% by weight of copper (Cu), from 2 - 4.5% by weight of silicon (Si), from 0.005% to 0.02% Pb and the rest of zinc (Zn) " .
  • the alloy contains bismuth to improve machinability. It also mentions that a portion of Zinc can be replaced with aluminum, silicon or tin or a portion of copper can be substituted with iron, nickel or manganese.
  • the present invention relates to an alloy of copper (Cu) - zinc (Zn), with additional alloying elements, such as lead (Pb), silicon (Si) and aluminum (Al) which, considered as a whole, provide the alloy with superior properties of fluidity, high performance in forging, continuous casting and other processes with temperatures above 650 ° C.
  • additional alloying elements such as lead (Pb), silicon (Si) and aluminum (Al) which, considered as a whole, provide the alloy with superior properties of fluidity, high performance in forging, continuous casting and other processes with temperatures above 650 ° C.
  • this alloy ideal for use in foundry processes; due to the high fluidity index that it presents within the molds and that facilitates the filling of cavities. It also provides good results by producing easily removable shavings in cutting and machining operations and in surface preparation operations such as sanding and polishing, it works hard to give the pieces roughness and Ideal shine for the application of coatings such as chrome plating, where there is excellent adhesion, texture and gloss that provides good corrosion resistance, guaranteeing the durability of the pieces produced.
  • the present invention consists of an unprecedented alloy of copper - zinc - lead - silicon - aluminum that is characterized by containing low% lead (0.25% Pb max.) And which shows good mechanical, chemical and electrochemical properties that allow the friendly manufacturing of Good quality products at a competitive cost in the field of tap and valve manufacturing.
  • Figure 1 shows the behavior of properties such as “Tensile strength (Psi) ⁇ ” Elongation (%) “,” Electrical conductivity (S) “,” Hardness “, as well as the phases found in the structures metallurgical depending on its chemical composition in the copper - zinc system.
  • Figure 3 shows the influence of the concentration of aluminum, lead and silicon on the flow rate of different chemical compositions of copper-zinc alloys.
  • Figure 5 shows the influence of the concentration of lead, silicon and aluminum on hardness (HRB) to different chemical compositions of the copper-zinc system.
  • Figure 6 shows the experimental behavior of the flow rate as a function of the chemical composition; where it is determined that for casting processes either molding in sand or emptying in permanent mold, values greater than or equal to 12 guarantee a good behavior in the casting processes.
  • Figure 7 shows the experimental behavior found of hardness (HRB) as a function of chemical composition. It is established that for production purposes hardnesses greater than 70 HRB are not recommended for the manufacture of faucets and low pressure valves.
  • Figure 8 shows the microstructural analysis of the present alloy in amplifications of 10X, 20X and 50X, where the characteristic ⁇ + ⁇ phase of this composition is observed; a homogeneous growth of grain that will provide good mechanical properties and good performance in the production processes for the manufacture of taps.
  • the present invention was formulated from an experimental approach of alloys that included 100 alloys in order to study the influence of alloying elements on copper-zinc alloys and thus determine the best lead-free alloys that were suitable for use in the manufacture of valves and taps.
  • the present invention was formulated from an experimental approach of alloys that included 100 alloys in order to study the influence of alloying elements on copper-zinc alloys and thus determine the best lead-free alloys that were suitable for use in the manufacture of valves and taps.
  • a design of experiments that allowed reducing the amount of experiments to 45 tests.
  • All the alloys made were evaluated for hardness, chemical composition and fluidity index; and for the selected alloys metallurgical analyzes were carried out to be able to relate their microstructure with the mechanical properties. Its corrosion resistance was also evaluated by saline chamber tests to guarantee its durability when the products are installed in the field.
  • the analyzes performed for each alloy at this stage were: a) Chemical composition.
  • the emptying temperature of the liquid metal was equal to 1000 ° C ⁇ 5 ° C; residence time of the liquid metal in the oven before being emptied, scummed and refined of the liquid metal less than 20 minutes.
  • Amount of liquid metal prepared from each alloy 25 Kg; pure materials were used for the preparation of alloys during experimental development; Emptying speed of molds 1 - 2 Kg / sec, emptying height (Distance between the pot's peak and the entrance to the mold, during mold filling). c) HRB hardness:
  • the Rockwell B scale is used to measure the hardness of soft steels, construction, non-ferrous metals. The relationship between the Rockwell number and the printing depth h exists the following dependency.
  • Corrosion resistance tests in saline chamber were performed according to ASTM G85 - 09 to the alloys considered appropriate to be studied and patented.
  • the samples are attacked by a continuous flow of water rich in chlorides, which catalyzes the corrosion process and allows us to predict the electrochemical behavior of the samples over time.
  • the tests carried out lasted 140 hours in a salt spray chamber, equivalent to a field work of the piece analyzed for more than 10 years.
  • the binary Cu - Zn alloys have better performance in the processes of smelting and forging, when working in% Zn from 35% to 45%.
  • the present invention uses a protected% Zn range, using a range of 35-40% Zn to prevent premature corrosion of the produced parts.
  • Figure 4 shows that in binary alloys, as the zinc content in copper alloys increases; Hardness increases slightly.
  • Figure 6 shows the results of the fluidity tests that were obtained from the alloy of the present patent application in various percentages within the same range, where its excellent performance in the foundry processes is observed.
  • the fluidity obtained is similar to the eco-brass alloy and, superior to the C27450 alloy (commercial lead-free alloys 0.25% Pb max.).
  • the flow rates greater than or equal to 12 are suitable for use in smelting processes, where by easily running the liquid metal, the worked molds can be filled successfully and therefore, the generation of defects decreases. In alloys where the flow rate is less than 12, its application in foundry processes is not recommended. Because it will present important problems of lack of filling, roughness, embedded sand or plugs.
  • Figure 4 shows the hardness characterization of different chemical compositions of the CuZn alloy.
  • Table 2 shows a comparison of commercially available alloys with respect to the alloy of the present invention when evaluating the chemical composition, fluidity index and hardness (HRB).
  • the material can be easily machined and the products have good mechanical properties and corrosion resistance, which is acceptable.
  • metallographic analyzes and corrosion tests were performed on the alloy of the present invention.
  • the alloy was exposed to 140 hours of salt chamber, which is equivalent to having the parts tested for more than 10 years installed in the field in optimal conditions thus ensuring satisfactory performance of The presented alloy.
  • the alloy was defined, evaluated and approved for its satisfactory performance in its mechanical, chemical and electrochemical properties in the aforementioned tests, it was used for the manufacture of various tap products and pilot-level valves to ensure that the manufacture of The alloy corresponds to the properties inherent in the metal and could be transformed profitably.
  • Forged parts also presented excellent forging properties (Hot deformation at temperatures greater than 650 ° C).
  • the flow of the coolant improves the efficiency of the cuts when the jet impacts directly on the tool and the part (where the operation is being done).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Conductive Materials (AREA)
  • Domestic Plumbing Installations (AREA)

Abstract

La présente invention concerne un alliage de cuivre (Cu)-zinc (Zn) comprenant des éléments d'alliages additionnels tels que le plomb (Pb), le silicium (Si) et l'aluminium (Al) peu coûteux, qui, considérés ensemble, confèrent à l'alliage des propriétés supérieures de fluidité. Cette invention porte ainsi sur un alliage Cu-ZN-Si_Al ayant une teneur en plomb minimale.
PCT/MX2015/000123 2014-09-08 2015-09-08 Alliage de cuivre à faible teneur en plomb pour la fabrication de produits hydrauliques pour la basse pression Ceased WO2016039610A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CONC2017/0002987A CO2017002987A2 (es) 2014-09-08 2017-03-28 Aleación de cobre con bajo contenido de plomo para la fabricación de productos hidráulicos para baja presión

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MX2014010796A MX2014010796A (es) 2014-09-08 2014-09-08 Aleacion de cobre con bajo contenido de plomo para la fabricacion de productos hidraulicos para baja presion.
MXMX/A/2014/010796 2014-09-08

Publications (1)

Publication Number Publication Date
WO2016039610A1 true WO2016039610A1 (fr) 2016-03-17

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PCT/MX2015/000123 Ceased WO2016039610A1 (fr) 2014-09-08 2015-09-08 Alliage de cuivre à faible teneur en plomb pour la fabrication de produits hydrauliques pour la basse pression

Country Status (4)

Country Link
CO (1) CO2017002987A2 (fr)
MX (1) MX2014010796A (fr)
PE (1) PE20170496A1 (fr)
WO (1) WO2016039610A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109963954A (zh) * 2017-02-10 2019-07-02 国立铜业股份公司 低铅含量的铜合金

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115017816A (zh) * 2022-06-17 2022-09-06 重庆大学 一种基于代理模型的感应电机用铜转子配方优化方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5879477A (en) * 1993-05-17 1999-03-09 Kohler Co. Reduced lead bismuth yellow brass
US20090022620A1 (en) * 2007-06-28 2009-01-22 Kai Weber Copper-zinc alloy, production method and use
US7883589B2 (en) * 2005-09-22 2011-02-08 Mitsubishi Shindoh Co., Ltd. Free-cutting copper alloy containing very low lead
US8273193B2 (en) * 2008-12-02 2012-09-25 Xiamen Lota International Co., Ltd. Lead-free, bismuth-free free-cutting silicon brass alloy
US8366841B2 (en) * 2011-01-11 2013-02-05 Ningbo Xingaoda Advanced Metallic Materials Co., Ltd Lead-free free-cutting corrosion-resistant silicon-bismuth brass alloy
US8425697B2 (en) * 2008-06-11 2013-04-23 Xiamen Lota International Co., Ltd. Tin-free lead-free free-cutting magnesium brass alloy

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5879477A (en) * 1993-05-17 1999-03-09 Kohler Co. Reduced lead bismuth yellow brass
US7883589B2 (en) * 2005-09-22 2011-02-08 Mitsubishi Shindoh Co., Ltd. Free-cutting copper alloy containing very low lead
US20090022620A1 (en) * 2007-06-28 2009-01-22 Kai Weber Copper-zinc alloy, production method and use
US8425697B2 (en) * 2008-06-11 2013-04-23 Xiamen Lota International Co., Ltd. Tin-free lead-free free-cutting magnesium brass alloy
US8273193B2 (en) * 2008-12-02 2012-09-25 Xiamen Lota International Co., Ltd. Lead-free, bismuth-free free-cutting silicon brass alloy
US8366841B2 (en) * 2011-01-11 2013-02-05 Ningbo Xingaoda Advanced Metallic Materials Co., Ltd Lead-free free-cutting corrosion-resistant silicon-bismuth brass alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109963954A (zh) * 2017-02-10 2019-07-02 国立铜业股份公司 低铅含量的铜合金

Also Published As

Publication number Publication date
MX2014010796A (es) 2016-03-08
CO2017002987A2 (es) 2017-08-31
PE20170496A1 (es) 2017-04-28

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