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WO2013099315A1 - Alliage de laiton sans plomb pour permettre un traitement à chaud - Google Patents

Alliage de laiton sans plomb pour permettre un traitement à chaud Download PDF

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Publication number
WO2013099315A1
WO2013099315A1 PCT/JP2012/060466 JP2012060466W WO2013099315A1 WO 2013099315 A1 WO2013099315 A1 WO 2013099315A1 JP 2012060466 W JP2012060466 W JP 2012060466W WO 2013099315 A1 WO2013099315 A1 WO 2013099315A1
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WO
WIPO (PCT)
Prior art keywords
alloy
lead
test
silicon
zinc
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/JP2012/060466
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English (en)
Japanese (ja)
Inventor
山本　秀樹
耕 星野
克之 中島
誠 上野
哲也 松橋
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.)
Joetsu Bronz1 Corp
Original Assignee
Joetsu Bronz1 Corp
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 Joetsu Bronz1 Corp filed Critical Joetsu Bronz1 Corp
Priority to CN201280002483.8A priority Critical patent/CN103282524B/zh
Priority to KR1020137006081A priority patent/KR20140113872A/ko
Priority to US14/127,212 priority patent/US20140112821A1/en
Publication of WO2013099315A1 publication Critical patent/WO2013099315A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • 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 lead-free brass alloy for hot working having excellent dezincing resistance and erosion / corrosion resistance, and having good hot workability and mechanical properties.
  • copper alloys such as bronze and brass have been used for water faucet fittings, water fittings for general piping, and various valves, taking advantage of their excellent material properties. Since these copper alloys are required to have good machinability for product processing, in general, necessary machinability has been imparted by containing lead.
  • bronze alloys such as JIS H5120 CAC406 and CAC407 that are excellent in machinability, or brass alloys such as JIS H3250 C3604 and C3771 contain 1 to 6 wt% of lead.
  • lead has been recognized as a harmful element that adversely affects the human body and environmental health due to evaporation during alloy melting and casting processes, or elution into drinking water when used as water contact parts. Tend to be severely restricted. Therefore, development of a free-cutting copper alloy containing no lead has been demanded.
  • Patent Document 1 a Cu—Zn—Si-based alloy, which does not contain lead and obtains free-cutting properties by adding silicon, has been proposed and used (Patent Document 1). 2).
  • Patent Document 3 a Cu—Zn—Si—Sn alloy added with tin in order to enhance the corrosion resistance of the Cu—Zn—Si alloy has been proposed (see Patent Document 3).
  • Patent Document 4 Cu-Zn-Si-Bi alloy with bismuth added to further improve the machinability of Cu-Zn-Si alloy (see Patent Document 4) and tin added to improve corrosion resistance
  • Patent Document 5 has also been proposed.
  • alloys are excellent in mechanical properties and dezincing resistance, have excellent machinability when bismuth is added, and have excellent hot workability in alloys not added with bismuth.
  • bismuth is added to a Cu—Zn—Si alloy, there is also an advantage that the range of use of scrap of the melting raw material is widened.
  • the alloy does not contain bismuth, there is an effect of improving machinability by a silicon-based compound, but it may not be sufficient.
  • bismuth In order to improve machinability, bismuth must be added to some extent. It is the fact that we do not get. Also, it is desirable to contain bismuth from the viewpoint of scrap utilization.
  • the leadless brass alloy containing bismuth can be hot-worked in a molding process with a small amount of deformation, but does not strictly control the amount of bismuth added and forging conditions when performing a molding process with a large amount of deformation. And defects such as forging cracks are likely to occur.
  • hot forging of brass alloys it is known that the occurrence of cracks in products varies depending on the processing temperature. There is an upper limit and a lower limit for the processing temperature at which processing can be performed without generating cracks, and it is necessary to perform forging by heating in this temperature range (hereinafter referred to as processing temperature range).
  • the alloy of Patent Document 5 containing about 0.7 wt% of bismuth needs to increase the processing temperature, and furthermore, the processing temperature range is very narrow, so that temperature management is difficult and there is a problem in terms of energy consumption. .
  • the alloy of Patent Document 3 it is described that addition of silicon is effective as an element for improving the hot forgeability, but in the examples, data on hot workability when bismuth is contained. Is not introduced, and the processing temperature is evaluated only at the 750 ° C. level, and the processing temperature range is unknown.
  • Cu—Zn—Si—Sn—Bi-based alloys contain tin in order to improve dezincing resistance and erosion / corrosion resistance, so that elongation tends to decrease.
  • ⁇ phase and ⁇ phase are precipitated, and the mechanical properties are likely to be deteriorated depending on the precipitation state.
  • the second problem is to control the mechanical properties, particularly elongation, of the Cu—Zn—Si—Sn—Bi alloy.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lead-free brass alloy for hot working having good hot workability and mechanical properties.
  • the gist of the present invention will be described.
  • Zinc 28.0-35.0 wt%, Silicon: 0.5-2.0 wt%, Tin: 0.5-1.5 wt%, Bismuth: 0.5-1.5 wt%, Lead: 0.10 wt% Characterized in that the balance is composed of copper and inevitable impurities, the zinc equivalent is in the range of 40.0 to 43.0, and the area ratio of the ⁇ phase after hot working is 20% or less. It relates to a lead-free brass alloy for hot working.
  • the present invention relates to the lead-free brass alloy for hot working according to claim 1, wherein the elongation is 10% or more.
  • the present invention is configured as described above, it is a lead-free brass alloy for hot working having good hot workability and mechanical properties. That is, good hot workability can be obtained by containing 28.0 to 35.0 wt% of zinc. Like zinc, silicon is an essential element for obtaining good hot workability, and the addition of 0.5 to 2.0 wt% is effective. Tin contributes to the improvement of dezincification corrosion resistance and erosion / corrosion corrosion resistance. Bismuth is added to improve machinability. The zinc equivalent is determined by the balance of zinc, silicon, and other elements, and is particularly a parameter for maintaining a balance between hot workability and mechanical properties. Both properties are within the range of 40.0 to 43.0. Will be satisfied at the same time. Further, when the area ratio of the ⁇ phase is 20% or less, good mechanical properties can be obtained.
  • the present invention has good dezincing resistance and erosion / corrosion resistance, and further ensures excellent hot workability and good mechanical properties, so that zinc: 28.0 to 35.0 wt%, silicon: Contains 0.5 to 2.0 wt%, tin: 0.5 to 1.5 wt%, bismuth: 0.5 to 1.5 wt%, lead: 0.10 wt% or less, with the remainder consisting of copper and inevitable impurities
  • the present invention provides a lead-free brass alloy for hot working having a zinc equivalent within the range of 40.0 to 43.0.
  • Zinc (Zn) Zinc dissolves in the matrix of Cu—Zn—Si based copper alloy and has the effect of increasing the mechanical strength. In addition, the melting point of the alloy is lowered to increase the fluidity of the molten metal, thereby improving the castability. Moreover, there exists an effect
  • the zinc content is set to 28.0 to 35.0 wt%.
  • Silicon (Si) Silicon acts as a deoxidizing material at the time of melting, improving the fluidity of the molten metal and improving the castability. In addition, partly dissolves in the matrix to increase mechanical strength, and partly acts with zinc to cause a hard phase that functions as a chip breaker during cutting to improve machinability.
  • bismuth In the heating stage during hot working, bismuth has the property of easily agglomerating at grain boundaries, which is considered as a factor that hinders hot workability.
  • adding an appropriate amount of silicon prevents bismuth aggregation and is effective for preventing forging cracks.
  • it is necessary to contain 0.5 wt% or more of silicon.
  • the silicon content is set to 0.5 to 2.0 wt%.
  • Tin (Sn) Tin is effective in improving dezincing resistance and erosion / corrosion resistance. In particular, it is effective in improving erosion / corrosion resistance, and in order to obtain these effects, it is necessary to add 0.5 wt% or more. On the other hand, if the content exceeds 1.5 wt%, the mechanical properties may be deteriorated. For these reasons, the tin content is set to 0.5 to 1.5 wt%.
  • Bismuth (Bi) When bismuth is less than 0.5 wt%, the machinability improving effect is hardly recognized, but by adding 0.5 wt% or more, the machinability is improved according to the amount of addition. However, it causes deterioration of hot workability, and a large amount of addition is not preferable. Further, not only hot workability but also mechanical property deterioration is caused, so the addition was made up to 1.5 wt%.
  • Lead (Pb) Lead content of 0.10 wt% or less leads to damage to the human body and environmental sanitation due to evaporation during alloy melting and casting, or elution into drinking water when used as water-contact parts. Can be substantially avoided. For these reasons, the lead content is regulated to 0.10 wt% or less.
  • Copper is an element that weakens the dezincification corrosion susceptibility and improves the corrosion resistance and mechanical properties, but in the alloy of the present invention, its content is determined as the balance by the balance between zinc and silicon content. The substantial content is 59.0 to 71.0 wt%.
  • Zinc Equivalent Zinc equivalent is an important parameter for maintaining a wide working temperature range in the alloy of the present invention.
  • the processing temperature range can be kept wide by appropriate addition of silicon, but the management of silicon alone is insufficient, and the zinc equivalent calculated by the balance of silicon, zinc, etc. is also limited.
  • the processing temperature range can be more reliably kept wide.
  • the zinc equivalent in the alloy of the present invention is 40.0 or more, and the processing temperature width has a width that can be industrially satisfied.
  • the zinc equivalent exceeds 43.0, the mechanical properties may be deteriorated. From such a background, the zinc equivalent was set to 40.0 to 43.0.
  • Hot working test Fig. 2 shows the chemical components of the samples subjected to the hot working test.
  • a molten metal adjusted to a chemical composition as shown in FIG. 2 was cast in a mold having an outer diameter of 88 mm and a length of 120 mm, and machined to an outer diameter of 78 mm and a length of 90 mm.
  • the machined billet was extruded to a diameter of 22 mm, and the resulting extruded rod was processed into a test piece shape as shown in FIG.
  • These test pieces were forged at a processing rate of 80% while changing the processing temperature.
  • the processing rate was calculated by the following formula.
  • Processing rate 100 x (sample height before forging-sample height after forging) / sample height before forging
  • the heating time was 20 minutes in all tests.
  • the processing temperature range of each sample is shown in FIGS.
  • FIG. 5 shows the effectiveness of silicon addition for the alloy of the present invention.
  • the processing temperature width is narrow, but it can be seen that the processing temperature width increases with the addition of silicon.
  • FIG. 6 shows the effectiveness of zinc equivalent.
  • the zinc equivalent In order to keep the working temperature range good in the alloy of the present invention, it has been found that the zinc equivalent must be within the range of 40.0 to 43.0, combined with the effect of expanding the working temperature range by adding silicon described above. Thus, the necessity of appropriately controlling the zinc equivalent was confirmed.
  • FIG. 7 shows chemical components of the test material subjected to the tensile test. It was cast into a mold having a diameter of 45 mm and a length of 100 mm, and machined into a billet having a diameter of 40 mm and a length of 75 mm. Subsequently, the billet was heated at 650 to 750 ° C., extruded to a diameter of 10 mm, machined into a JIS Z2201 14A test piece, and subjected to a tensile test using a universal testing machine. The results are shown in FIGS.
  • the alloy of the present invention has excellent hot workability as described above, and it is important to appropriately control the Si addition amount and the zinc equivalent. However, when the zinc equivalent is high, the elongation tends to decrease, and the control of the structure becomes an issue.
  • the alloy of the present invention is mainly composed of a ⁇ phase and an ⁇ phase, and the microstructure was observed by paying attention to the influence of the quantitative ratio of the ⁇ phase on the mechanical properties.
  • the sample subjected to the tensile test five images of 500 times magnification were taken with an optical microscope, and the quantitative ratio of ⁇ phase was measured with image processing software (an example of the photograph taken in FIG. 23). Is shown.) These results are shown in FIGS.
  • the inventors discovered the following facts. It has been discovered that the elongation of the alloy system of the present invention has a very strong correlation with the area ratio of the ⁇ phase. When increasing the elongation, it is necessary to keep the area ratio of the ⁇ phase low.
  • the area ratio of the ⁇ phase and the silicon addition amount When the relationship between the area ratio of the ⁇ phase and the silicon addition amount is arranged, it increases according to the silicon addition amount (see FIG. 13). Further, in the relation between the area ratio of the ⁇ phase and the elongation, the elongation is 20% or less and the elongation is 10% or more (see FIG. 14). Therefore, the area ratio of the ⁇ phase in the alloy of the present invention needs to be 20% or less.
  • FIG. 15 shows chemical components of test materials subjected to the erosion / corrosion test.
  • a molten metal adjusted to a chemical composition as shown in FIG. 15 was cast in a metal mold having a diameter of 40 mm and a length of 100 mm and processed into a test piece shape as shown in FIG. Using these test pieces, the test was performed under the test conditions of FIG. The test results are shown in FIG. From these results, it has been found that the alloy of the present invention is slightly inferior to CAC406 but greatly improved compared to free-cutting brass.
  • FIG. 20 shows chemical components of the test materials subjected to the machinability test.
  • the molten metal adjusted in the chemical composition as shown in FIG. 20 was cast in a JIS H5120 E mold, and the outer diameter of the test piece was processed under the cutting conditions shown in FIG. Cutting resistance was measured.
  • the test results are shown in FIG. Compared to lead-containing bronze and lead-containing brass, the alloy of the present invention has a higher resistance, but it has been confirmed that it is at the same level as lead-free bronze.

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  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Forging (AREA)
  • Conductive Materials (AREA)
  • Domestic Plumbing Installations (AREA)
  • Heat Treatment Of Steel (AREA)
PCT/JP2012/060466 2011-12-27 2012-04-18 Alliage de laiton sans plomb pour permettre un traitement à chaud Ceased WO2013099315A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201280002483.8A CN103282524B (zh) 2011-12-27 2012-04-18 热加工用无铅黄铜合金
KR1020137006081A KR20140113872A (ko) 2011-12-27 2012-04-18 열간 가공용 무연 황동합금
US14/127,212 US20140112821A1 (en) 2011-12-27 2012-04-18 Lead-free brass alloy for hot working

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011-286159 2011-12-27
JP2011286159A JP5143948B1 (ja) 2011-12-27 2011-12-27 熱間加工用無鉛黄銅合金

Publications (1)

Publication Number Publication Date
WO2013099315A1 true WO2013099315A1 (fr) 2013-07-04

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PCT/JP2012/060466 Ceased WO2013099315A1 (fr) 2011-12-27 2012-04-18 Alliage de laiton sans plomb pour permettre un traitement à chaud

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US (1) US20140112821A1 (fr)
JP (1) JP5143948B1 (fr)
KR (1) KR20140113872A (fr)
CN (1) CN103282524B (fr)
TW (1) TWI539015B (fr)
WO (1) WO2013099315A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10358696B1 (en) 2014-02-07 2019-07-23 Chase Brass And Copper Company, Llc Wrought machinable brass alloy
US9951400B1 (en) * 2014-02-07 2018-04-24 Chase Brass And Copper Company, Llc Wrought machinable brass alloy
CZ306429B6 (cs) * 2015-10-07 2017-01-18 Comtes Fht A.S. Obrobitelná mosaz se sníženým obsahem olova vhodná pro tváření válcováním za studena
KR101969010B1 (ko) * 2018-12-19 2019-04-15 주식회사 풍산 납과 비스무트가 첨가되지 않은 쾌삭성 무연 구리합금
CN113348260B (zh) 2019-06-25 2022-09-16 三菱综合材料株式会社 易切削铜合金及易切削铜合金的制造方法
TWI751825B (zh) * 2019-12-11 2022-01-01 日商三菱綜合材料股份有限公司 快削性銅合金及快削性銅合金的製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001064742A (ja) * 1999-06-24 2001-03-13 Chuetsu Metal Works Co Ltd 耐食性、被削性、熱間加工性に優れた黄銅合金
JP2003247035A (ja) * 2002-02-25 2003-09-05 Dowa Mining Co Ltd 耐応力腐食割れ性および耐脱亜鉛性に優れた銅合金およびその製造方法
JP2005290475A (ja) * 2004-03-31 2005-10-20 Dowa Mining Co Ltd 黄銅およびその製造方法ならびにこれを用いた部品
WO2009048008A1 (fr) * 2007-10-10 2009-04-16 Toto Ltd. Laiton à coupe rapide, exempt de plomb ayant une excellente aptitude à la coulée
WO2011121798A1 (fr) * 2010-03-31 2011-10-06 Ｊマテ．カッパープロダクツ 株式会社 Alliage de laiton de décolletage exempt de plomb

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1035561C (zh) * 1992-12-04 1997-08-06 梦境有限公司 黄铜合金及其在制备饮水装置中的应用
JP2004244672A (ja) * 2003-02-13 2004-09-02 Dowa Mining Co Ltd 耐脱亜鉛性に優れた銅基合金

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001064742A (ja) * 1999-06-24 2001-03-13 Chuetsu Metal Works Co Ltd 耐食性、被削性、熱間加工性に優れた黄銅合金
JP2003247035A (ja) * 2002-02-25 2003-09-05 Dowa Mining Co Ltd 耐応力腐食割れ性および耐脱亜鉛性に優れた銅合金およびその製造方法
JP2005290475A (ja) * 2004-03-31 2005-10-20 Dowa Mining Co Ltd 黄銅およびその製造方法ならびにこれを用いた部品
WO2009048008A1 (fr) * 2007-10-10 2009-04-16 Toto Ltd. Laiton à coupe rapide, exempt de plomb ayant une excellente aptitude à la coulée
WO2011121798A1 (fr) * 2010-03-31 2011-10-06 Ｊマテ．カッパープロダクツ 株式会社 Alliage de laiton de décolletage exempt de plomb

Also Published As

Publication number Publication date
TW201335391A (zh) 2013-09-01
TWI539015B (zh) 2016-06-21
CN103282524A (zh) 2013-09-04
KR20140113872A (ko) 2014-09-25
JP2013133529A (ja) 2013-07-08
CN103282524B (zh) 2016-08-31
US20140112821A1 (en) 2014-04-24
JP5143948B1 (ja) 2013-02-13

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