WO2000022181A1 - Alliage de decolletage a base de cuivre - Google Patents

Alliage de decolletage a base de cuivre Download PDF

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Publication number
WO2000022181A1
WO2000022181A1 PCT/JP1998/005156 JP9805156W WO0022181A1 WO 2000022181 A1 WO2000022181 A1 WO 2000022181A1 JP 9805156 W JP9805156 W JP 9805156W WO 0022181 A1 WO0022181 A1 WO 0022181A1
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Prior art keywords
weight
alloy
silicon
machinability
copper
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PCT/JP1998/005156
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English (en)
Japanese (ja)
Inventor
Keiichiro Oishi
Original Assignee
Sambo Copper Alloy Co., Ltd.
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 Sambo Copper Alloy Co., Ltd. filed Critical Sambo Copper Alloy Co., Ltd.
Priority to AU10540/99A priority Critical patent/AU738301B2/en
Priority to CA002303512A priority patent/CA2303512C/fr
Priority to EP98953070A priority patent/EP1038981B1/fr
Priority to DE69828818T priority patent/DE69828818T2/de
Publication of WO2000022181A1 publication Critical patent/WO2000022181A1/fr
Priority to US09/983,029 priority patent/US7056396B2/en
Priority to US11/004,879 priority patent/US20050092401A1/en
Priority to US11/094,815 priority patent/US8506730B2/en
Priority to US13/829,813 priority patent/US20130276938A1/en
Priority to US14/463,172 priority patent/US20150044089A1/en

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    • 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
    • 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 free-cutting copper alloy containing almost no lead component.
  • bronze alloys such as JISH 5111BC6 and brass alloys such as JISH 3250-C3604 and C3771 are generally known. These have improved machinability by containing about 1.0 to 6.0% by weight of lead, and have been used for various products that require cutting (for example, water supply pipes). It is useful as a component of faucet fittings, plumbing fittings, valves, etc.).
  • lead does not form a solid solution in the matrix, but improves the machinability by dispersing in the form of particles.
  • chips are generated.
  • Fig. 1 (D) various troubles such as spiral generation and entanglement with the byte occur.
  • the lead content is usually set to 2.0% by weight or more.
  • wrought copper alloys that require advanced cutting processing contain about 3.0% by weight or more of lead, and bronze-based materials contain about 5% by weight of lead. ing.
  • the lead content is about 5.0% by weight.
  • lead is a harmful substance that has an adverse effect on human health and the environment, its use has recently tended to be greatly restricted.
  • metal vapor generated during high-temperature work such as melting and forging alloys may contain lead components, or lead components may be eluted from faucet fittings or valves upon contact with drinking water.
  • lead components may be eluted from faucet fittings or valves upon contact with drinking water.
  • An object of the present invention is to have extremely high machinability in spite of the fact that the content of lead, which is a machinability improving element, is extremely small (0.02 to 0.4% by weight), It can be safely used as an alternative to conventional free-cutting copper alloys containing a large amount of lead, and has no environmental health problems, including the reuse of chips, and lead-containing products are being regulated.
  • An object of the present invention is to provide a free-cutting copper alloy that can sufficiently cope with a recent trend.
  • Another object of the present invention is to provide excellent corrosion resistance in addition to machinability, such as cut products, forged products, and porcelain products that require corrosion resistance (for example, hydrants, plumbing fittings, valves, etc.). , Stems, hot water supply piping parts, shafts, heat exchanger parts, etc.), and it is an object of the present invention to provide a free-cutting copper alloy having an extremely large practical value.
  • Still another object of the present invention is to provide not only machinability but also high strength and abrasion resistance, and a machined product, a forged product and a porcelain product requiring high strength and abrasion resistance.
  • machinability but also high strength and abrasion resistance
  • a machined product a forged product and a porcelain product requiring high strength and abrasion resistance.
  • bearings, bolts, nuts, bushings, gears, sewing machine parts, hydraulic parts, etc. has a very high practical value. Is to provide.
  • Still another object of the present invention is to excel in high-temperature oxidation resistance in addition to machinability, such as cut products, forged products, and porcelain products that require high-temperature oxidation resistance (for example, petroleum products).
  • machinability such as cut products, forged products, and porcelain products that require high-temperature oxidation resistance (for example, petroleum products).
  • It can be suitably used as a constituent material of gas hot air nozzles, perna heads, gas nozzles for water heaters, etc., and is intended to provide a free-cutting copper alloy with a very large practical value. is there.
  • the present invention proposes the following free-cutting copper alloy to achieve the above object. That is, in the first invention, as a copper alloy having excellent machinability, copper 69 to 79% by weight, silicon 2.0 to 4.0% by weight, and lead 0.02 to 0.4% by weight.
  • the first invention alloy a free-cutting copper alloy which contains an alloy and has an alloy composition composed of zinc.
  • the first invention alloy enables a significant reduction in lead content while ensuring industrially satisfactory machinability by adding silicon. .
  • the first invention alloy has improved machinability by forming seven phases by adding silicon.
  • the amount of silicon is less than 2.0% by weight, the formation of seven phases sufficient to ensure industrially satisfactory machinability is not performed.
  • the machinability is improved with an increase in the amount of silicon added.
  • silicon has a high melting point and a low specific gravity and is easily oxidized, when silicon alone is charged into a furnace during melting of an alloy, the silicon floats on the surface of the molten metal and is oxidized during melting to form silicon oxide or oxidized silicon. It becomes silicon, and it becomes difficult to produce a silicon-containing copper alloy.
  • the addition of silicon is performed after a Cu—Si alloy is added, and the production cost increases. Even in consideration of such an alloy production cost, it is not preferable to add silicon in an amount at which the machinability improving effect is saturated (more than 4.0 wt.
  • the copper content is 6% in consideration of the relationship with the zinc content. For this reason, it has been found that the content of copper and silicon is preferably 69-79% by weight and 2-9% by weight, respectively. . It was set to 0 to 4.0% by weight.
  • the addition of silicon not only improves the machinability, but also improves the flowability, strength, wear resistance, stress corrosion cracking resistance, and high temperature oxidation resistance during fabrication. Also, ductility and anti-zinc corrosion resistance are improved to some extent.
  • the amount of lead added was set to 0.02 to 4% by weight for the following reasons. That is, in the first invention alloy, machinability can be ensured even when the amount of lead is reduced by adding silicon having the above-described functions, but in particular, the conventional free-cutting copper alloy is used. In order to obtain better machinability, it is necessary to add lead in an amount of 0.02% by weight or more. However, if the added amount of lead exceeds 0.4% by weight, the cut surface becomes rougher, the workability in hot working (for example, forging) becomes worse, and the ductility in cold work also decreases.
  • the addition amount of lead is set to 0.02 to 0.4% by weight for the above-described reason.
  • copper alloys also having excellent machinability include 69 to 79% by weight of copper, 2.0 to 4.0% by weight of silicon, and 0.02 to 0.4% of lead. % By weight, and one element selected from bismuth 0.02 to 0.4% by weight, tellurium 0.02 to 0.4% by weight and selenium 0.02 to 0.4% by weight.
  • second invention alloy a free-cutting copper alloy having an alloy composition of zinc.
  • the second invention alloy is composed of the first invention alloy containing 0.02 to 0.4% by weight of bismuth, 0.02 to 0.4% by weight of tellurium, and 0.02 to 0.4% by weight of selenium. It forms an alloy composition further containing one.
  • Bismuth, tellurium, or selenium, like lead does not form a solid solution in the matrix and disperses in a granular form, thereby exhibiting the function of improving machinability, and can compensate for the shortage of lead. Things. Therefore, if any of these are co-added with silicon and lead, the limit of machinability improvement by the addition of silicon and lead And the machinability can be further improved.
  • the second invention alloy paying attention to this point, one of bismuth, tellurium, and selenium is added to further improve the machinability of the first invention alloy. In particular, by adding bismuth, tellurium, or selenium in addition to silicon and lead, a high degree of machinability is exhibited even when cutting complicated shapes at high speed.
  • the addition amount of bismuth, tellurium, or selenium is set to 0.02 to 0.4% by weight.
  • the total amount of both added is not more than 0.4% by weight. If the total amount of addition exceeds 0.4% by weight even slightly, the workability in hot work and ductility in cold state is not as large as in the case where the single addition amount exceeds 0.4% by weight.
  • copper alloys also having excellent machinability include copper of 70 to 80% by weight, silicon of 1.8 to 3.5% by weight, and lead of 0.02 to 0.4%.
  • Wt%, tin 0.3-3.5 wt%, aluminum 0.3-3.5 wt% and phosphorus A free-cutting copper alloy containing at least one element selected from the group consisting of 0.02 to 0.25% by weight and the balance being zinc (hereinafter referred to as "third invention alloy”) ).
  • Tin when added to a Cu—Zn alloy, forms seven phases, similar to silicon, to improve machinability.
  • tin is added in an amount of 1.8 to 4.0% by weight in a Cu-Zn-based alloy containing 58 to 70% by weight of (1) so that even if silicon is not added, It shows good machinability, so by adding tin to the Cu-Si-Zn-based alloy, the formation of the ⁇ -phase can be promoted, and the Cu-Si-Zn-based alloy can be promoted.
  • the formation of the alpha phase by tin is carried out at 1.0% by weight or more and becomes saturated when it reaches 3.5% by weight.
  • the effect of forming the ⁇ phase is not only saturated, but also the ductility is reduced, and when the amount of tin added is less than 1.0% by weight, the effect of forming the y phase is small.
  • the amount of addition is 0.3% by weight or more, there is an effect of dispersing and homogenizing the “phase formed by silicon”.
  • the machinability is also improved by the phase dispersing effect, that is, if the added amount of tin is 0.3% by weight or more, the machinability is improved by the addition of tin.
  • Aluminum also has a function of promoting the formation of the ⁇ phase, as with tin. By adding it together with or instead of tin, aluminum improves the machinability of the Cu—Si—Zn alloy. It can be further improved. Aluminum has a function to improve strength, wear resistance, high-temperature oxidation resistance, and a function to lower the specific gravity of the alloy, in addition to the machinability. It is necessary to add 0% by weight. However, even if added in an amount exceeding 3.5%, the machinability improvement effect commensurate with the added amount is not seen, and as with tin, ductility is reduced.
  • Phosphorus does not have the function of forming an alpha phase like tin or aluminum, but it is added with silicon or with one or both of tin and aluminum.
  • there is a function of uniformly dispersing the generated a phase and improving the phase distribution and such a function can further improve the machinability due to the formation of the a phase.
  • the addition of phosphorus improves the hot workability, improves the strength and stress corrosion cracking resistance, by dispersing the seven phases and at the same time refining the ⁇ -phase crystal grains in the matrix.
  • it also has the effect of significantly improving the flowability of the molten metal during construction. Such an effect due to the addition of phosphorus is not exhibited with an addition of less than 0.02% by weight.
  • the (11-31-? 3 ⁇ 4) -211 series alloy (the first invention alloy) contains 0.3 to 3.5% by weight of tin and 1.0% of aluminum.
  • the machinability is further improved by adding at least one of -3.5% by weight and 0.02 -0.25% by weight of phosphorus.
  • tin, aluminum or phosphorus improves the machinability by the function of forming the a phase or the function of dispersing the seven phases as described above.
  • tin, aluminum or phosphorus is closely contacted with silicon. Relationship. Therefore, in the third invention alloy in which tin, aluminum or phosphorus is co-added to silicon, the function of improving machinability is exhibited by replacing with silicon of the first invention alloy, and the machinability is independent of the seven phases.
  • the required addition amount of silicon is smaller than that of the second invention alloy to which bismuth, tellurium, or selenium is added, which has a function of improving the machinability (a function of improving the machinability by dispersing in a granular form in the matrix).
  • machinability a function of improving the machinability by dispersing in a granular form in the matrix.
  • the addition amount of silicon is set to 1.8 to 3.5% by weight.
  • the relationship between the amount of silicon added and The upper and lower limits of the amount of copper were set slightly higher than those of the second invention alloy, and the preferred content was set to 70 to 80% by weight from the viewpoint of the addition of tin, aluminum or phosphorus.
  • copper alloys also having excellent machinability include copper of 70 to 80% by weight, silicon of 1.8 to 3.5% by weight, and lead of 0.02 to 0.4%. And at least one element selected from the group consisting of tin 0.3 to 3.5% by weight, aluminum 1.0 to 3.5% by weight and phosphorus 0.02 to 0.25% by weight, and bismuth.
  • One element selected from 0.02 to 0.4% by weight, tellurium 0.02 to 0.4% by weight and selenium 0.02 to 0.4% by weight, and the balance is We propose a free-cutting copper alloy having an alloy composition of zinc (hereinafter referred to as the "fourth invention alloy"). That is, the fourth invention alloy has bismuth 0.02 to 0.4 weight as the third invention alloy.
  • the fifth invention as a copper alloy having excellent corrosion resistance in addition to machinability, 69-79% by weight of copper, 2.0-4.0% by weight of silicon, and 0.4% by weight of lead. 0.2 to 0.4% by weight, tin 0.3 to 3.5% by weight, phosphorus 0.02 to 25% by weight, antimony 0.02 to 0.15% by weight and arsenic 0.02
  • a free-cutting copper alloy hereinafter referred to as the "fifth invention alloy" containing at least one element selected from 0.1 to 15% by weight and having the balance of zinc. .
  • the first invention alloy contains 0.3 to 3.5% by weight of tin, 0.02 to 25% by weight of phosphorus, 0.02 to 0.15% by weight of antimony and 0 to 15% by weight of arsenic.
  • the alloy composition further contains at least one of 0.2 to 15% by weight.
  • Tin has a function to improve corrosion resistance (anti-zinc corrosion resistance, corrosion resistance) and forgeability, in addition to its machinability improving function.
  • corrosion resistance anti-zinc corrosion resistance, corrosion resistance
  • forgeability and corrosion cracking resistance can be improved by dispersing the ⁇ phase.
  • the corrosion resistance is improved by such a function of tin, and the machinability is improved mainly by the effect of silicon addition. Therefore, the contents of silicon and copper are the same as those of the first invention alloy.
  • the amount of tin added must be at least 0.3% by weight.
  • the function of improving the corrosion resistance and forgeability due to the addition of tin is not economically useless even if added in excess of 3.5% by weight, because the effect cannot be obtained in proportion to the amount added.
  • Phosphorus uniformly disperses the seven phases and refines the crystal grains of the phases in the matrix, thereby improving the machinability and improving the corrosion resistance (anti-zinc corrosion resistance, anti-zinc corrosion resistance). It has the function of improving forgeability, forgeability, stress corrosion cracking resistance and mechanical strength.
  • the function of phosphorus improves corrosion resistance and the like, and the machinability is improved mainly by the effect of silicon addition.
  • the effect of improving the corrosion resistance and the like due to the addition of phosphorus is exerted by the addition of a trace amount of phosphorus, and is exerted by the addition of 0.02% by weight or more. However, even if it is added in excess of 0.25% by weight, not only the effect corresponding to the added amount cannot be obtained, but also the hot forgeability and the extrudability decrease.
  • Antimony and arsenic also improve anti-zinc corrosion resistance and the like in a very small amount (0.02% by weight or more), like phosphorus. However, if the content exceeds 0.15% by weight, not only the effect corresponding to the added amount is not obtained, but also the hot forgeability and the extrudability are reduced as in the case of excessive addition of phosphorus.
  • the fifth invention alloy in addition to the same amount of copper, silicon and lead as in the first invention alloy, at least one of tin, phosphorus, antimony and arsenic as a corrosion resistance improving element is in the above range. By adding it within, not only the machinability but also the corrosion resistance and the like can be improved.
  • tin and phosphorus mainly function as anticorrosion elements similar to antimony and arsenic. Therefore, a machinability improving element is added in addition to silicon and trace amounts of lead.
  • the compounding amounts of copper and silicon are 69 to 79% by weight and 2.0 to 4.0% by weight, respectively.
  • copper alloys also having excellent machinability and corrosion resistance include 69 to 79% by weight of copper, 2.0 to 4.0% by weight of silicon, and 0.02% of lead. ⁇ 0.4 wt%, tin 0.3-3.5 wt%, phosphorus 0.02-0.25 wt%, antimony 0.02-0.15 wt% and arsenic 0.02 At least one element selected from 0.1 to 5% by weight, bismuth 0.02 to 0.4% by weight, tellurium 0.02 to 0.4% by weight and selenium 0.02 to 0%
  • theixth invention alloy containing one element selected from 4% by weight and having an alloy composition of zinc.
  • the sixth invention alloy has the fifth invention alloy containing bismuth 0.02 to 0.4% by weight, tellurium 0.02 to 0.4% by weight, and selenium 0.02 to 0.4% by weight. It has an alloy composition further containing any one of them, and has a machinability by adding any one of bismuth, tellurium, and selenium in addition to silicon and lead, as in the second invention alloy. And at least one selected from the group consisting of tin, phosphorus, antimony, and arsenic, as in the fifth invention alloy, to improve corrosion resistance and the like.
  • the addition amounts of copper, silicon, lead, bismuth, tellurium, and selenium were the same as those of the second invention alloy, and the addition amounts of tin, phosphorus, antimony, and arsenic were the same as those of the fifth invention alloy.
  • the seventh invention as a copper alloy excellent in machinability, high strength and wear resistance, copper 62 to 78% by weight, silicon 2.5 to 4.5% by weight, Lead is selected from 0.02 to 0.4% by weight, tin 0.3 to 3.0% by weight, aluminum 0.2 to 2.5% by weight, and phosphorus 0.02 to 0.25% by weight. Contains at least one element selected from the group consisting of 0.7 to 3.5% by weight of manganese and 0.73.5% by weight of nickel, with the balance being zinc
  • Manganese or nickel combines with silicon to form Mn x S i ⁇ or N i ⁇ S i ⁇
  • a fine intermetallic compound is formed and uniformly deposited on the matrix, thereby improving wear resistance and strength. Therefore, high strength and wear resistance are improved by adding one or both of manganese and nickel. Such effects are exhibited when manganese and nickel are added in an amount of 0.7% by weight or more, respectively. However, even if it is added in excess of 3.5% by weight, the effect becomes saturated and the effect corresponding to the added amount cannot be obtained. Silicon was added in an amount of 2.5 to 4.5% by weight in consideration of the amount of silicon required to form an intermetallic compound with manganese or nickel.
  • the addition of tin, aluminum and phosphorus also strengthens the matrix phase and improves machinability.
  • Tin and phosphorus improve the strength, abrasion resistance and machinability by dispersing the graphite and ⁇ phases. Tin improves the strength and machinability when added at 0.3% by weight or more, but decreases the ductility when added at more than 3.0% by weight. Therefore, in the alloy of the seventh invention for improving high strength and wear resistance, the addition amount of tin is set to 0.3 to 3.0% by weight in consideration of the effect of improving machinability.
  • Aluminum also contributes to the improvement of abrasion resistance, and the matrix strengthening function is exhibited by adding 0.2% by weight or more. However, if added in excess of 2.5% by weight, the ductility decreases.
  • the addition amount of aluminum is set to 0.2 to 2.5% by weight.
  • the addition of phosphorus improves the hot workability, and improves the strength and wear resistance by dispersing the seven phases and simultaneously refining the grains of the single phase in the matrix.
  • the amount of copper was set to 62 to 78% by weight based on the relationship with the amount of silicon added and the relationship between manganese and nickel combined with silicon.
  • the eighth invention as a copper alloy having excellent high-temperature oxidation resistance in addition to machinability, 69-79% by weight of copper, 2.0-4.0% by weight of silicon, and 0.0% by weight of lead. 2 to 0.4% by weight, aluminum 0.1 to 1.5% by weight and phosphorus 0.02 to 0.2.
  • a free-cutting copper alloy containing 5% by weight and having an alloy composition consisting of zinc with the balance being zinc hereinafter, referred to as an "eighth invention alloy").
  • Aluminum is an element that improves strength, machinability and wear resistance, as well as high-temperature oxidation resistance. Further, as described above, silicon also has functions of improving machinability, strength, wear resistance, stress corrosion cracking resistance, and high temperature oxidation resistance. Improvement of the high-temperature oxidation resistance by aluminum is performed by adding 0.1% by weight or more by co-addition with silicon. However, even if aluminum is added in an amount exceeding 1.5% by weight, the effect of improving high-temperature oxidation resistance corresponding to the added amount is not observed. From this point, the addition amount of aluminum is set to 0.1 to 1.5% by weight.
  • Phosphorus is added to improve the flowability of the molten metal during the production of the alloy. Phosphorus also improves the high-temperature oxidation resistance in addition to the above-mentioned machinability and dezincification corrosion resistance in addition to the flowability of the molten metal. Such an effect of adding phosphorus is exhibited at 0.02% by weight or more. However, even if it is added in excess of 0.25% by weight, no effect commensurate with the added amount is observed, and rather the alloy becomes brittle. From such a point, the addition amount of phosphorus is set to 0.02 to 0.25% by weight.
  • silicon is added to improve machinability as described above, silicon also has a function of improving the flowability of molten metal like phosphorus.
  • the improvement of the fluidity due to silicon is exhibited by the addition of 2.0% by weight or more, which overlaps the addition range necessary for improving machinability. Therefore, the addition amount of silicon is set to 2.0 to 4.0% by weight in consideration of improvement in machinability.
  • copper alloys also having excellent machinability and high-temperature oxidation resistance include 69-79% by weight of copper, 2.0-4.0% by weight of silicon, and 0.1% by weight of lead. 0 2 to 0.4% by weight, aluminum 0.1 to 1.5% by weight, phosphorus 0.02 to 0.25% by weight, bismuth 0.02 to 0.4% by weight, tellurium 0
  • a copper alloy containing an element selected from 2 to 0.4% by weight and selenium 0.02 to 0.4% by weight and a balance of zinc hereinafter referred to as “the 9th alloy”. "Ming alloy").
  • the ninth invention alloy has the eighth invention alloy containing bismuth 0.02 to 0.4% by weight, tellurium 0.02 to 0.4% by weight, and selenium 0.02 to 0.4% by weight.
  • the alloy composition further contains any one of them. As described above, by adding bismuth or the like which is an element for improving machinability similar to lead, high-temperature oxidation resistance similar to that of the eighth invention alloy is obtained. While further improving the machinability.
  • copper alloys also having excellent machinability and high-temperature oxidation resistance include 69 to 79% by weight of copper, 2.0 to 4.0% by weight of silicon, and 0.1% by weight of lead. 0 2 to 0.4% by weight, aluminum 0.1 to 1.5% by weight, phosphorus 0.02 to 0.25% by weight, chromium 0.02 to 0.4% by weight and titanium 0 Free-cutting copper alloy containing one or more elements selected from the range of 0.2 to 0.4% by weight, with the balance being zinc (hereinafter referred to as "the 10th invention alloy”) We propose.
  • Chromium and titanium have a function of improving high-temperature oxidation resistance, and the function is particularly remarkably exerted by a synergistic effect of co-addition with aluminum. Such a function is exhibited at 0.02% by weight or more and becomes saturated at 0.4% by weight, respectively, irrespective of whether they are added alone or co-added. From such a point, in the tenth invention alloy, the eighth invention alloy further contains at least one of 0.02 to 0.4% by weight of chromium and 0.02 to 4% by weight of titanium.
  • the alloy composition of the present invention is intended to further improve the high-temperature oxidation resistance of the eighth invention alloy.
  • copper alloys also having excellent machinability and high-temperature oxidation resistance include 69 to 79% by weight of copper, 2.0 to 4.0% by weight of silicon, and 0.1% of lead. 0 2 to 0.4% by weight, aluminum 0.1 to 1.5% by weight, phosphorus 0.02 to 0.25% by weight, chromium 0.02 to 0.4% by weight and titanium 0 0.2 to 0.4% by weight of at least one element selected from the group consisting of bismuth 0.02 to 4 % By weight, one element selected from 0.02 to 0.4% by weight of tellurium, and 0.02 to 0.4% by weight of selenium, and the balance being an alloy composition comprising zinc.
  • the eleventh invention alloy a machinable copper alloy (hereinafter referred to as "the eleventh invention alloy").
  • the tenth invention alloy has bismuth 0.02 to 0.4% by weight, tellurium 0.02 to 0.4% by weight, and selenium 0.02 to 0.4% by weight.
  • bismuth which is an element similar to lead, which improves machinability by a function different from that of silicon, as described above, the tenth invention is achieved. It is intended to further improve machinability while maintaining high temperature oxidation resistance similar to that of alloys.
  • the above-mentioned alloys of the invention are subjected to a heat treatment at 400 to 600 ° C. for 30 minutes to 5 hours, so that the machinability is further improved.
  • a conductive copper alloy hereinafter referred to as the “first and second invention alloy”.
  • the first to eleventh invention alloys are obtained by adding a machinability improving element such as silicon, and have an excellent machinability due to the addition of such an element. Properties may be further improved by heat treatment. For example, for the alloys having a high copper concentration in the first to eleventh invention alloys and having a small number of a phases and a large number of phases, the heat treatment changes the c phase into the a phase, and the a phase becomes fine. By dispersing and precipitating, machinability is further improved. In addition, when assuming the actual production of porcelain, wrought material, and hot forged products, depending on the conditions such as ⁇ forming conditions, productivity after hot working (hot extrusion, hot forging, etc.), work environment, etc.
  • a machinability improving element such as silicon
  • these materials may be forced air-cooled or water-cooled.
  • the ⁇ phase is slightly reduced and contains the S phase.
  • the seven phases are finely dispersed and precipitated, and the machinability is improved.
  • the heat treatment temperature is less than 400 ° C.
  • the above-mentioned phase change rate becomes slow, and the heat treatment takes an extremely long time, so that it is not economically practical.
  • the temperature exceeds 600 ° C, the phase increases or the S phase appears, The effect of improving machinability cannot be obtained. Therefore, in consideration of practicality, it is preferable to perform heat treatment for 30 minutes to 5 hours under the condition of 400 to 600 ° C. in order to improve machinability.
  • FIG. 1 is a perspective view showing the form of chips generated when the surface of a round bar-shaped copper alloy is cut with a lathe.
  • No. 1200 was obtained by heat-treating an extruded material having the same composition as that of the first invention alloy No. 1006 at 580 ° C. for 30 minutes.
  • 200 2 is extruded material having the same composition as No. 100 6 at 450 ° C,
  • No. 12 00 3 was heat-treated under the conditions of 2 hours, and No. 12 00 3 was an extruded material having the same composition as the first invention alloy No. 100 7 under the same conditions as No. 1 2 0 1 (5
  • No. 12 0 04 is No. 10 at 80 ° C for 30 minutes.
  • Extruded material having the same composition as No. 07 was used under the same conditions as No. 1 2 0 2 (450 ° C, 2 Time).
  • No. 13006 corresponds to “13C4622”, and is a naval brass having the highest corrosion resistance among the copper products specified in JIS.
  • Figs. 1 (A) to (D) the state of the chips generated by cutting was observed and classified into four types as shown in Figs. 1 (A) to (D) according to their shapes and shown in Tables 1 to 15. Place If the chips have a spiral shape of three or more turns as shown in Fig. (D), it becomes difficult to process the chips (collection and reuse of the chips, etc.), and the chips are turned into bytes. Troubles such as entanglement or damage to the cutting surface occur, making it impossible to perform good cutting. Also, as shown in Fig. (C), when the chip has a spiral shape of about 2 turns from a half-turn arc shape, a large trouble such as a spiral form of 3 turns or more is obtained.
  • the quality of the cut surface was judged by the surface roughness.
  • the results were as shown in Tables 18 to 33.
  • the maximum height (Rmax) is often used as a standard for surface roughness, and it depends on the use of brass products. 10 ⁇ m ⁇ Rmax and 15 ⁇ m, it can be judged that industrially satisfactory machinability was obtained, and Rmax ⁇ 15 ⁇ m In this case, it can be determined that the machinability is poor.
  • Rmax ⁇ 10 am The case of W 1 P is indicated by “ ⁇ ”, the case of 10 m ⁇ Rmax ⁇ 15 ⁇ m is indicated by “ ⁇ ”, and the case of Rmax ⁇ 15 ⁇ m is indicated by “x”.
  • the first invention alloy No. 1001 to No. 107 the second invention alloy No. 200 to No. 206, 3rd invention alloy No. 3001 to No. 310, 4th invention alloy No. 4001 to No. 210, 5th invention alloy No. 5 0 0 1 to No. 520, 6th invention alloy No. 6 0 1 to No. 6 0 45, 7th invention alloy No. 7 0 1 to No. 7 0 29, 8th Invention alloys No. 800 1 to No. 800, ninth invention alloy No. 900 to No. 906, No. 10 invention alloy No. 1000 to No. 1 0 0 8, 1st invention alloy No. 1 1 0 0 1 to No.
  • 1 1 0 1 1 and 1 2 invention alloy No. 1 2 0 0 1 to No. 1 2 0 0 4 also has the same machinability as conventional alloys No. 1301 to No. 1303 containing a large amount of lead.
  • lead as well as conventional alloys No. 1304-No. It has good machinability compared to conventional alloys containing a large amount of No. 1301 to No. 1303.
  • the heat-treated first invention alloys N 0.12 0 01 to No. 1 200 4 Have the same or higher machinability, and it is understood that the heat treatment can further improve the machinability of the first to eleventh invention alloys depending on the conditions such as the alloy composition.
  • the first and second test pieces having the same shape were cut out from each extruded material obtained as described above.
  • each of the first test pieces was heated to 700 ° C, held for 30 minutes, and then compressed in the axial direction at a compressibility of 70% (the height of the first test piece). (Length) is 25 mm
  • the surface morphology 700 ° C deformability was visually determined after compression. The results were as shown in Tables 18 to 33. Judgment of the deformability was carried out visually from the state of the cracks on the side of the test piece, and in Tables 18 to 33, ⁇ indicates that no crack occurred and ⁇ indicates that a small crack occurred.
  • the 1st to 12th invention alloys are the same as the conventional alloys No. 13001 to No. 13004 and No. 13 It had a hot workability and a mechanical property equal to or higher than that of 1306, and was confirmed to be industrially suitable for use.
  • the seventh invention alloy has the same mechanical properties as conventional alloy No. 135, which is aluminum bronze with the highest strength among the copper products specified in JIS, It is understood that it is excellent in high strength.
  • the first to fourth invention alloys and the eighth to 12th invention alloys Lead-containing conventional alloys No. 1.301 to No. 1.33 have superior corrosion resistance compared to No. 1.33, and in particular, have improved machinability and corrosion resistance.
  • the No. 5 and No. 6 invention alloys are extremely superior to the conventional alloy No. 1.306, which is one of the most excellent corrosion resistance among brass products specified in JIS. It was confirmed that the steel had corrosion resistance.
  • the 12th invention alloy also has the same stress corrosion cracking resistance as the conventional alloy No. 1305, which is aluminum bronze that does not contain zinc, and is a corrosion-resistant copper product specified in JIS. It was confirmed that it had better stress corrosion cracking resistance than conventional alloy No. 13006, which is Naval brass which is the most excellent in resistance.
  • the obtained round bar-shaped test pieces were obtained, and the weight of each test piece (hereinafter referred to as “weight before oxidation”) was measured. Thereafter, each test piece was stored in a magnetic crucible and left in an electric furnace maintained at 500 ° C.
  • the test piece is taken out of the electric furnace, the weight of each test piece (hereinafter referred to as “post-oxidation weight”) is measured, and the weight of the test piece is calculated from the weight before oxidation and the weight after oxidation.
  • X (1 0 cm 2 test piece (cm 2) are those calculated from the equation J.
  • the wear resistance of the seventh invention alloys No. 701a to No. 709a was compared with that of the conventional alloys No. 1301a to No. 1306a. The following wear test was performed to confirm this.
  • an outer diameter of 32 mm and a thickness (length in the axial direction) of 10 mm are obtained by cutting an outer peripheral surface thereof, and performing drilling and cutting.
  • each test piece was fitted and fixed to a rotatable shaft, and 50 kg of SUS304 with an outer diameter of 48 mm whose axis was parallel to this was placed in a hole made of SUS304. A load is applied to maintain the state of pressing contact. Thereafter, the SUS304 roll and the test piece rolling thereon are rotated at the same rotation speed (209 rpm) while multi-oil is dropped on the outer peripheral surface of the test piece.
  • the seventh invention alloy No. 7001 a to No. 720 Conventional alloy No. 1 which is aluminum bronze with the highest wear resistance among the copper products specified in JIS as well as No. 1 304 and No. 130 06 It was confirmed that the abrasion resistance was excellent as compared with 1305. Therefore, when judged comprehensively in consideration of the results of the tensile test described above, the 7th invention alloy shows that, in addition to machinability, the wear resistance of the copper alloy products specified in JIS It can be said that it has high strength and wear resistance equal to or higher than aluminum bronze, which has the highest resistance.
  • Nana 74.6 2.8 0.05 0.08 0.19 Nana
  • Applicable 1 Painting Hot workability Suggested properties Refractory metal Cutting surface of chip Principal force Observed 70 0 ° C elongation Corrosion Elongation Corrosion No. Machine form (N) ( «m ) mm (N / mm 2 ) (%)

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Abstract

L'invention se rapporte à un alliage de décolletage à base de cuivre qui peut conserver sa capacité à subir un décolletage satisfaisant d'un point de vue industriel alors que sa teneur en plomb est considérablement réduite par rapport à celle d'un alliage classique de décolletage à base de cuivre. Cet alliage possède la composition suivante: 69 à 79 % en poids de cuivre, 2,0 à 4,0 % en poids de silicium, 0,02 à 0,4 % en poids de plomb, le reste de la composition étant constitué de zinc.
PCT/JP1998/005156 1998-10-09 1998-11-16 Alliage de decolletage a base de cuivre WO2000022181A1 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AU10540/99A AU738301B2 (en) 1998-10-09 1998-11-16 Free-cutting copper alloys
CA002303512A CA2303512C (fr) 1998-10-09 1998-11-16 Alliage de decolletage a base de cuivre
EP98953070A EP1038981B1 (fr) 1998-10-09 1998-11-16 Alliage de decolletage a base de cuivre
DE69828818T DE69828818T2 (de) 1998-10-09 1998-11-16 Automatenlegierung auf kupferbasis
US09/983,029 US7056396B2 (en) 1998-10-09 2001-10-22 Copper/zinc alloys having low levels of lead and good machinability
US11/004,879 US20050092401A1 (en) 1998-10-09 2004-12-07 Copper/zinc alloys having low levels of lead and good machinability
US11/094,815 US8506730B2 (en) 1998-10-09 2005-03-31 Copper/zinc alloys having low levels of lead and good machinability
US13/829,813 US20130276938A1 (en) 1998-10-09 2013-03-14 Copper/zinc alloys having low levels of lead and good machinability
US14/463,172 US20150044089A1 (en) 1998-10-09 2014-08-19 Copper/zinc alloys having low levels of lead and good machinability

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP28792198A JP3917304B2 (ja) 1998-10-09 1998-10-09 快削性銅合金
JP10/287921 1998-10-09

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US09403834 A-371-Of-International 1999-10-27
US09/983,029 Continuation-In-Part US7056396B2 (en) 1998-10-09 2001-10-22 Copper/zinc alloys having low levels of lead and good machinability

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DE (3) DE69833582T2 (fr)
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US8506730B2 (en) 1998-10-09 2013-08-13 Mitsubishi Shindoh Co., Ltd. Copper/zinc alloys having low levels of lead and good machinability
CN109563569A (zh) * 2016-08-15 2019-04-02 三菱伸铜株式会社 易切削性铜合金及易切削性铜合金的制造方法

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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
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JP5645570B2 (ja) * 2010-09-27 2014-12-24 株式会社Ｌｉｘｉｌ 鍛造用及び切削加工用銅基合金並びに水道用器具
US20140294665A1 (en) 2011-02-04 2014-10-02 Baoshida Swissmetal Ag Cu-Ni-Zn-Mn Alloy
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JP2015175008A (ja) * 2014-03-13 2015-10-05 株式会社Ｌｉｘｉｌ 鉛レス黄銅材料および水道用器具
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WO2019035224A1 (fr) * 2017-08-15 2019-02-21 三菱伸銅株式会社 Alliage de cuivre de décolletage, et procédé de fabrication de celui-ci
JP6448166B1 (ja) * 2017-08-15 2019-01-09 三菱伸銅株式会社 快削性銅合金、及び、快削性銅合金の製造方法
JP6448168B1 (ja) * 2017-08-15 2019-01-09 三菱伸銅株式会社 快削性銅合金、及び、快削性銅合金の製造方法
US11155909B2 (en) 2017-08-15 2021-10-26 Mitsubishi Materials Corporation High-strength free-cutting copper alloy and method for producing high-strength free-cutting copper alloy
KR101969010B1 (ko) 2018-12-19 2019-04-15 주식회사 풍산 납과 비스무트가 첨가되지 않은 쾌삭성 무연 구리합금
JP7180488B2 (ja) * 2019-03-25 2022-11-30 三菱マテリアル株式会社 銅合金丸棒材
TWI731506B (zh) 2019-06-25 2021-06-21 日商三菱伸銅股份有限公司 快削性銅合金及快削性銅合金的製造方法
WO2020261666A1 (fr) 2019-06-25 2020-12-30 三菱マテリアル株式会社 Alliage de cuivre à décolletage et procédé de production d'alliage de cuivre à décolletage
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KR20220059528A (ko) 2019-12-11 2022-05-10 미쓰비시 마테리알 가부시키가이샤 쾌삭성 구리 합금, 및 쾌삭성 구리 합금의 제조 방법
DE102020127317A1 (de) 2020-10-16 2022-04-21 Diehl Metall Stiftung & Co. Kg Bleifreie Kupferlegierung sowie Verwendung der bleifreien Kupferlegierung

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CN109563569A (zh) * 2016-08-15 2019-04-02 三菱伸铜株式会社 易切削性铜合金及易切削性铜合金的制造方法
CN109563569B (zh) * 2016-08-15 2020-09-18 三菱伸铜株式会社 易切削性铜合金及易切削性铜合金的制造方法

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EP1508626A1 (fr) 2005-02-23
DE69828818D1 (de) 2005-03-03
EP1038981B1 (fr) 2005-01-26
JP3917304B2 (ja) 2007-05-23
KR20010033101A (ko) 2001-04-25
EP1508626B1 (fr) 2006-09-13
EP1038981A1 (fr) 2000-09-27
DE69833582T2 (de) 2007-01-18
JP2000119774A (ja) 2000-04-25
EP1502964B1 (fr) 2006-03-01
KR100375426B1 (ko) 2003-03-10
TW577931B (en) 2004-03-01
EP1038981A4 (fr) 2003-02-19
CA2303512C (fr) 2006-07-11
DE69835912D1 (de) 2006-10-26
EP1502964A1 (fr) 2005-02-02
DE69833582D1 (de) 2006-04-27
DE69835912T2 (de) 2007-03-08
AU1054099A (en) 2000-05-01
DE69828818T2 (de) 2006-01-05
CA2303512A1 (fr) 2000-04-20

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