WO2015137048A1 - Matériau de laiton exempt de plomb et instrument pour une alimentation en eau - Google Patents

Matériau de laiton exempt de plomb et instrument pour une alimentation en eau Download PDF

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Publication number
WO2015137048A1
WO2015137048A1 PCT/JP2015/054100 JP2015054100W WO2015137048A1 WO 2015137048 A1 WO2015137048 A1 WO 2015137048A1 JP 2015054100 W JP2015054100 W JP 2015054100W WO 2015137048 A1 WO2015137048 A1 WO 2015137048A1
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WIPO (PCT)
Prior art keywords
lead
mass
brass material
content
bismuth
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Application number
PCT/JP2015/054100
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English (en)
Japanese (ja)
Inventor
鈴木　宏昌
継志 伊藤
文康 石黒
佐藤　浩司
Original Assignee
株式会社Ｌｉｘｉｌ
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 株式会社Ｌｉｘｉｌ filed Critical 株式会社Ｌｉｘｉｌ
Publication of WO2015137048A1 publication Critical patent/WO2015137048A1/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

Definitions

  • the present invention relates to a lead-less brass material and a water supply device.
  • brass-based alloys are often used for water supply appliances, and some of these alloys contain lead (Pb).
  • Pb lead
  • lead has been used as a material useful for reducing nests generated during casting and improving cutting workability. Therefore, if the brass material simply does not contain lead or lead is reduced, the desired characteristics cannot be satisfied.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide an alloy material capable of simultaneously satisfying characteristics such as cutting workability, castability, and corrosion resistance.
  • the lead-less brass material according to an aspect of the present invention includes copper, zinc, bismuth, selenium, and silicon.
  • This lead-less brass material has a selenium content of 0.04 to 0.58 mass%.
  • the castability can be improved while maintaining the machinability to some extent.
  • lead-free may include not only the case where lead is not completely contained or the case where it is slightly contained as an impurity, but also the case where the lead content is reduced as compared with the conventional case.
  • the bismuth content may be 0.59 to 2.44% by mass, and the silicon content may be 0.30 to 1.68% by mass. Thereby, corrosion resistance can be improved, maintaining cutting workability to some extent.
  • Another aspect of the present invention is also a lead-less brass material.
  • This leadless brass material contains copper, zinc, bismuth, selenium and silicon, the selenium content is 0.04 to 0.58% by mass, and the bismuth content is 0.76 to 1.72% by mass.
  • the silicon content is 0.53 to 1.00% by mass.
  • cutting workability, castability and corrosion resistance can be achieved at a higher level.
  • Still another embodiment of the present invention is also a lead-less brass material.
  • This lead-less brass material is a lead-less brass material containing copper, zinc, bismuth, selenium and silicon, and has a selenium content of 0.04 to 0.15 mass% and a bismuth content of 0. It is 76 to 1.00% by mass, and the silicon content is 0.53 to 1.00% by mass.
  • the material cost can be reduced while achieving both higher machinability, castability and corrosion resistance.
  • the lead content may be less than 0.25% by mass. Thereby, it becomes easy to use for water appliances, such as a faucet metal fitting and a water pipe.
  • the lead content is preferably less than 0.15% by weight, more preferably less than 0.10% by weight, and even more preferably less than 0.05% by weight.
  • Another aspect of the present invention is a water supply device.
  • This water supply device is manufactured using the above lead-less brass material.
  • an alloy material that can simultaneously achieve characteristics such as cutting workability, castability, and corrosion resistance.
  • FIG. 2A is a diagram showing a cross-sectional photograph of a test piece with good corrosion resistance by an evaluation test
  • FIG. 2B is a diagram showing a cross-sectional photograph of a test piece with poor corrosion resistance by an evaluation test.
  • FIG. 3A is an image showing the distribution of copper (Cu) in a lead-less brass material that is one of the examples
  • FIG. 3B is zinc (1) in the lead-less brass material that is one of the examples. It is an image which shows distribution of Zn).
  • FIG. 4A is an image showing the distribution of tin (Sn) in a lead-less brass material that is one of the examples, and FIG.
  • FIG. 4B is a bismuth in a lead-less brass material that is one of the examples. It is an image which shows distribution of Bi).
  • FIG. 5A is an image showing the distribution of selenium (Se) in a lead-less brass material which is one of the examples
  • FIG. 5B is a diagram showing silicon (1) in the lead-less brass material which is one of the examples. It is an image which shows distribution of Si).
  • Ingots made of Comparative Examples 1 to 20 and Examples 1 to 45 showing the components of the additive elements shown in Tables 1 and 2 were produced by a general method. Then, using the ingots of each comparative example and each example, a machinability evaluation test, a castability evaluation test, and a dezincification corrosion resistance evaluation test were performed.
  • the machinability index of 90 or more is indicated by ⁇ , 80 or more and less than 90 by ⁇ , and less than 80 by x.
  • FIG. 1 is a plan view of a both-end restraint test mold used for castability evaluation.
  • This metal mold has a rectangular central mold 11 provided at the center and a pair of rectangular constraining molds 12a and 12b provided at both ends.
  • the central mold 11 and the constraining molds 12a and 12b are made of S45C. These are combined together and fixed to each other by a bolt (not shown) to form a mold.
  • a square recess 13 is formed in the center of the central mold 11. Further, the central mold 11 is formed with a groove 14 that communicates with the recess 13 and extends in the width direction. The recess 13 and the groove 14 have the same depth. The recess 13 is filled with a heat insulating material 16 made of casting sand and wax except for a portion 15 communicating with the groove 14.
  • the central mold 11 is formed with a groove 17 communicating with the groove 14 and the portion 15.
  • the constraining dies 12a and 12b are formed with triangular recesses 18a and 18b communicating with the ends of the groove 14, the portion 15 and the groove 17, respectively.
  • the depths of the grooves 17 and the recesses 18a and 18b are also the same as the recesses 13 and the grooves 14.
  • a double arrow-shaped cavity is formed by the groove 14, the portion 15, the groove 17, and the recesses 18a and 18b.
  • the molten alloy 19 according to the example and the comparative example was poured into the cavity of this mold.
  • the recesses 18a and 18b are restrained, and a solidification contraction force is generated.
  • the central portion of the molten metal 19 in the cavity is delayed by the heat insulating material 16 as compared with the recesses 18a and 18b and becomes a final solidified portion, and the solidification shrinkage force is concentrated. Castability was evaluated by the presence or absence and degree of cracking at the central portion.
  • FIG. 2A is a diagram showing a cross-sectional photograph of a test piece with good corrosion resistance by an evaluation test
  • FIG. 2B is a diagram showing a cross-sectional photograph of a test piece with poor corrosion resistance by an evaluation test.
  • FIG. 3A is an image showing the distribution of copper (Cu) in a lead-less brass material that is one of the examples
  • FIG. 3B is zinc (1) in the lead-less brass material that is one of the examples. It is an image which shows distribution of Zn).
  • FIG. 4A is an image showing the distribution of tin (Sn) in a lead-less brass material that is one of the examples
  • FIG. 4B is a bismuth in a lead-less brass material that is one of the examples. It is an image which shows distribution of Bi).
  • FIG. 3A is an image showing the distribution of copper (Cu) in a lead-less brass material that is one of the examples
  • FIG. 3B is zinc (1) in the lead-less brass material that is one of the examples. It is an image which shows distribution of Zn).
  • FIG. 4A is an image showing the distribution of tin (Sn) in a lead-less brass material that is one of the examples
  • FIG. 4B is a bismuth in a lead-less brass material that
  • FIG. 5A is an image showing the distribution of selenium (Se) in a lead-less brass material which is one of the examples
  • FIG. 5B is a diagram showing silicon (1) in the lead-less brass material which is one of the examples. It is an image which shows distribution of Si).
  • FIGS. 3A to 5B is an image of the same region of the sample.
  • a white (bright) region indicates that the concentration of the corresponding element is relatively high
  • a black (dark) region indicates that the concentration of the corresponding element is relatively low.
  • the white areas shown in FIGS. 3A and 3B indicate that a large amount of copper and zinc are present.
  • a region surrounded by a dotted line in FIG. 3A is a slightly darker region than other white regions.
  • the area surrounded by the dotted line in FIG. 3B corresponding to the area surrounded by the dotted line in FIG. 3A is a brighter area than the other white areas. That is, a region surrounded by a dotted line is a ⁇ phase having a relatively large amount of zinc in the brass alloy, and other white regions are an ⁇ phase having a relatively large amount of copper.
  • the distribution of tin shown in FIG. 4A and the distribution of silicon shown in FIG. 5B are often present in the ⁇ phase as shown by the white area surrounded by a dotted line. Recognize.
  • the distribution of bismuth shown in FIG. 4 (b) and the distribution of selenium shown in FIG. 5 (a) are often present in black regions other than the ⁇ phase and ⁇ phase shown in FIG. 3 (a) and FIG. 3 (b). You can see that
  • Comparative Examples 15 to 19 in which both bismuth and silicon are added there are some which have improved machinability as compared with Comparative Examples 13 and 14 in which only silicon is added. Sex is getting worse. Further, when Comparative Examples 20 to 24 in which both bismuth and selenium are added are seen, although the machinability is improved, the corrosion resistance tends to be poor.
  • the present inventors have conceived that selenium is further added.
  • the leadless brass materials according to Examples 1 to 45 include copper, zinc, bismuth, selenium, and silicon.
  • tin, aluminum (Al), and other impurities may be included as appropriate.
  • the lead-less brass material according to the present embodiment preferably has a selenium content of 0.04 to 0.58 mass%. As shown in Comparative Example 25, when the selenium content is about 0.02% by mass, improvement in cutting workability is not observed. As shown in Examples 1 to 45, the bismuth content is preferably 0.59 to 2.44 mass%, and the silicon content is preferably 0.30 to 1.68 mass%. Thereby, corrosion resistance can be improved, maintaining cutting workability to some extent.
  • Examples 12 to 45 when the bismuth content is 0.76% by mass or more, the machinability is further improved. As shown in Examples 1 to 43, when the bismuth content is 1.72% by mass or less, the castability is improved.
  • the corrosion resistance is further improved when the silicon content is 0.53% by mass or more.
  • the machinability is further improved. improves.
  • the selenium content is 0.04 to 0.58 mass% and the bismuth content is 0.76 to 1.72 mass%.
  • silicon content is 0.53 to 1.00% by mass, cutting workability, castability and corrosion resistance can be achieved at a higher level.
  • the selenium content is 0.04 to 0.15 mass%
  • the bismuth content is 0.76 to 1.00 mass%
  • silicon By making the content of 0.53 to 1.00% by mass, it is possible to reduce material costs while at the same time achieving higher levels of cutting workability, castability, and corrosion resistance.
  • the lead content in the lead-less brass material according to the present embodiment is preferably less than 0.25% by mass. Thereby, it becomes easy to use for water appliances, such as a faucet metal fitting and a water pipe.
  • the lead content is preferably less than 0.15% by weight, more preferably less than 0.10% by weight, and even more preferably less than 0.05% by weight.
  • a water supply device (water faucet) was manufactured by casting using a lead-less brass material containing each element at a rate as shown in each of the above examples. Specifically, in the first step, the materials were prepared so that each faucet fitting was a component of the examples shown in Table 2. Next, in the second step, molding was performed by casting. Then, in the third step, the obtained molded product was cut, and in the fourth step, the product was completed. In this way, even if a water supply device having a complicated internal shape and a non-monotonous external shape is manufactured by casting using the leadless brass material according to the present embodiment, there is no problem due to casting, and cutting is easy. You can get water supplies.
  • the present invention can be used for water appliances such as faucet fittings.

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

Abstract

La présente invention concerne un matériau de laiton exempt de plomb et un instrument pour une alimentation en eau, et fournit un matériau d'alliage qui a obtenu un bon équilibre entre des caractéristiques telles que l'aptitude au découpage, la coulabilité et la résistance à la corrosion. La composition de ce matériau d'alliage, qui est un matériau de laiton exempt de plomb, contient du sélénium dans une quantité de 0,04 à 0,58% en masse. En outre, ce matériau de laiton exempt de plomb contient du bismuth dans une quantité de 0,59 à 2,44% en masse. Il est préférable que ce matériau de laiton exempt de plomb contienne du silicium dans une quantité de 0,30 à 1,68% en masse.
PCT/JP2015/054100 2014-03-13 2015-02-16 Matériau de laiton exempt de plomb et instrument pour une alimentation en eau WO2015137048A1 (fr)

Applications Claiming Priority (2)

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JP2014-050439 2014-03-13
JP2014050439A JP2015175008A (ja) 2014-03-13 2014-03-13 鉛レス黄銅材料および水道用器具

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11028466B2 (en) 2016-01-21 2021-06-08 Fortune Mfg. Co., Ltd. Unleaded free-cutting brass alloys with excellent castability, method for producing the same, and application thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006016630A1 (fr) * 2004-08-10 2006-02-16 Sanbo Shindo Kogyo Kabushiki Kaisha Alliage de cuivre moule et méthode de moulage s’y rapportant
JP2010242184A (ja) * 2009-04-07 2010-10-28 Toto Ltd 鋳造性及び耐食性に優れた無鉛快削性黄銅

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3917304B2 (ja) * 1998-10-09 2007-05-23 三宝伸銅工業株式会社 快削性銅合金
CN100567533C (zh) * 2006-01-18 2009-12-09 江西理工大学 无铅铜合金

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006016630A1 (fr) * 2004-08-10 2006-02-16 Sanbo Shindo Kogyo Kabushiki Kaisha Alliage de cuivre moule et méthode de moulage s’y rapportant
JP2010242184A (ja) * 2009-04-07 2010-10-28 Toto Ltd 鋳造性及び耐食性に優れた無鉛快削性黄銅

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11028466B2 (en) 2016-01-21 2021-06-08 Fortune Mfg. Co., Ltd. Unleaded free-cutting brass alloys with excellent castability, method for producing the same, and application thereof

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