JP7588979B2 - Manufacturing method of copper alloy tube - Google Patents
Manufacturing method of copper alloy tube Download PDFInfo
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Description
本発明は、高強度であり、且つ、加工性に優れた銅合金管に関する。 The present invention relates to a copper alloy tube that is high in strength and has excellent workability.
従来より、銅材の高強度化を目的として、微量の元素を添加した銅合金が提案されている。そのうちの１つとして、Ｃｕ－Ｎｉ－Ｐ系の銅合金がある。（例えば、特許文献１：特開平４－２１８６３１号公報）。 Copper alloys with trace elements added have been proposed in the past to increase the strength of copper materials. One of these is a Cu-Ni-P-based copper alloy. (For example, Patent Document 1: JP-A-4-218631).
そして、高強度の銅合金管としては、特許文献２の請求項４には、０．４０～３．５質量％のＮｉと、０．１～０．５質量％のＰと、を含有し、残部Ｃｕ及び不可避不純物からなる銅合金材料（Ａ）を６５０℃±１００℃で加熱する第一熱処理を行って引張強さ（σ２）が２７０～３７０ＭＰａである銅合金材料（Ｂ）を得、銅合金材料（Ｂ）を８５０℃±１００℃で加熱する第二熱処理を行って得られる、引張強さ（σ２）が３００ＭＰａ以上、伸び（δ）が３０％以上の銅合金材料（Ｃ）が開示されている。 As a high-strength copper alloy pipe, claim 4 of Patent Document 2 discloses a copper alloy material (A) containing 0.40 to 3.5 mass% Ni, 0.1 to 0.5 mass% P, with the remainder being Cu and unavoidable impurities, which is subjected to a first heat treatment at 650°C ± 100°C to obtain a copper alloy material (B) having a tensile strength (σ2) of 270 to 370 MPa, and then subjected to a second heat treatment at 850°C ± 100°C to obtain a copper alloy material (C) having a tensile strength (σ2) of 300 MPa or more and an elongation (δ) of 30% or more.
その実施例（実施例１１～１２）には、Ｎｉが０．４１～３．３０質量％、Ｐが０．１２～０．４０質量％、残部Ｃｕ及び不可避不純物からなる化学組成で鋳造－９００℃に加熱して熱間押出－９００℃で加熱後水冷（溶体化処理に該当）－冷間で引抜加工－６５０℃で第一熱処理－８５０℃で第二熱処理した銅管が開示されている。 The examples (Examples 11 and 12) disclose copper tubes with a chemical composition of 0.41 to 3.30 mass% Ni, 0.12 to 0.40 mass% P, the balance being Cu and unavoidable impurities, which are cast, heated to 900°C, hot extruded, heated at 900°C and then cooled in water (corresponding to solution treatment), cold drawn, first heat treated at 650°C, and second heat treated at 850°C.
また、６５０℃での第一熱処理後の冷却は冷却速度は特に制限されないが、好ましくは２～１０℃／分、８５０℃での第二熱処理後の冷却は冷却速度は特に制限されないが、好ましくは２～２０℃／秒であるとの記載がある。 It also states that the cooling rate after the first heat treatment at 650°C is not particularly limited, but is preferably 2 to 10°C/min, and that the cooling rate after the second heat treatment at 850°C is not particularly limited, but is preferably 2 to 20°C/sec.
また、特許文献３の請求項１には、０．４～１．５質量％のＮｉと、０．１～０．５質量％のＰと、を含有し、残部Ｃｕ及び不可避不純物からなる銅合金鋳塊を鋳造し、熱間加工及び冷間加工を行う銅合金管の製造工程として、溶体化処理後、５５０～７５０℃で加熱する第一熱処理と、７５０～９５０℃で加熱し加熱温度から３００℃まで５℃／秒以下の平均冷却速度で冷却する第二熱処理を有する銅合金管の製造方法が開示されている。 In addition, claim 1 of Patent Document 3 discloses a method for producing a copper alloy tube, which includes a process for casting a copper alloy ingot containing 0.4 to 1.5 mass% Ni, 0.1 to 0.5 mass% P, with the balance being Cu and unavoidable impurities, and hot and cold working the ingot. The process includes a first heat treatment in which the ingot is heated to 550 to 750°C after solution treatment, and a second heat treatment in which the ingot is heated to 750 to 950°C and cooled from the heating temperature to 300°C at an average cooling rate of 5°C/sec or less.
銅合金材料が銅合金管である場合、特に、ルームエアコン、パッケージエアコン等の空調機用熱交換器又は冷凍機等の伝熱管又は冷媒配管の場合、空調機用熱交換器又は冷凍機等は、管材を他の部材と共に組み付けた後、ろう付け加熱することにより、管材と他の部材をろう付けして製造されるが、このろう付け加熱を特許文献２及び特許文献３における第二熱処理（特許文献２における８５０℃±１００℃熱処理）とすることができる。 When the copper alloy material is a copper alloy pipe, particularly when it is a heat transfer pipe or refrigerant piping for a heat exchanger or a refrigerator for an air conditioner such as a room air conditioner or packaged air conditioner, the heat exchanger or refrigerator for an air conditioner is manufactured by assembling the pipe material with other components and then brazing the pipe material to the other components by brazing heating, and this brazing heating can be the second heat treatment in Patent Document 2 and Patent Document 3 (850°C ± 100°C heat treatment in Patent Document 2).
ところが、この場合、第二熱処理時間は６００秒以上の長時間となる場合が多く、第二熱処理及び冷却後の銅合金管の強度は十分高いものとは言えない。そのため、Ｃｕ－Ｎｉ－Ｐ系の銅合金管のさらなる高強度化が望まれている。 However, in this case, the second heat treatment time is often as long as 600 seconds or more, and the strength of the copper alloy tube after the second heat treatment and cooling cannot be said to be sufficiently high. Therefore, there is a demand for further increasing the strength of Cu-Ni-P copper alloy tubes.
また、銅合金管の製造においては、後工程の加工性を考慮し、冷間加工により加工硬化した銅管の歪除去を行うために、冷間加工後に、６５０℃±１００℃程度の温度で、加熱する熱処理が必要である。 In addition, in the manufacture of copper alloy pipes, in consideration of the workability in subsequent processes, heat treatment is required after cold working to remove distortion from the copper pipes that have become work-hardened due to cold working, at a temperature of approximately 650°C ± 100°C.
従って、本発明の目的は、冷間加工後に、６５０℃±１００℃で加熱する熱処理が施された銅合金管であって、強度が高く且つ加工性に優れたＣｕ－Ｎｉ－Ｐ系の銅合金管を提供することにある。 The object of the present invention is therefore to provide a Cu-Ni-P copper alloy tube that has been subjected to heat treatment at 650°C ± 100°C after cold working, and that has high strength and excellent workability.
上記技術背景の基、本発明者らは、鋭意検討を重ねた結果、銅合金のＮｉ及びＰの含有量を特定の範囲にした上で、冷間加工後に、６５０℃±１００℃程度の温度で、加熱する熱処理を施した後、８５０℃±１００℃の高温での熱処理と２２５±１００℃の低温での熱処理を行うことにより、銅合金管の高強度化が可能であること、更には、８５０℃±１００℃熱処理後の冷却速度を最適化することにより、更なる銅合金管の高強度化が可能であることを見出し、本発明を完成させるに至った。 Based on the above technical background, the inventors have conducted extensive research and found that it is possible to increase the strength of copper alloy pipes by setting the Ni and P content of the copper alloy within a specific range, subjecting the copper alloy to a heat treatment at a temperature of about 650°C±100°C after cold working, and then subjecting the copper alloy pipes to a high-temperature heat treatment at 850°C±100°C and a low-temperature heat treatment at 225±100°C. Furthermore, it is possible to further increase the strength of copper alloy pipes by optimizing the cooling rate after the 850°C±100°C heat treatment, and thus completed the present invention.
すなわち、本発明（１）は、０．４０～１．５０質量％のＮｉと、０．１０～０．５０質量％のＰと、を含有し、残部Ｃｕ及び不可避不純物からなる銅合金鋳塊を鋳造する鋳造工程と、
該銅合金鋳塊を、熱間で加工する熱間加工工程と、
該熱間加工工程後に、冷間加工を行う冷間加工工程と、
を有し、
該熱間加工工程後、該冷間加工工程前又は該冷間加工工程後に、銅合金管を８００～１０００℃で加熱した後、加熱温度から２２５℃まで１００℃／秒以上の平均冷却速度で冷却することにより溶体化する溶体化処理と、
該溶体化処理後に、銅合金管を６５０±１００℃で１０～６００分間加熱する第一熱処理（Ａ１）及び該第一熱処理（Ａ１）を行った後、加熱温度から３００℃まで１℃／秒以下の平均冷却速度で冷却する冷却と、
該第一熱処理（Ａ１）後に、銅合金管を８５０±１００℃で１０～１８００秒間加熱する第二熱処理（Ａ２）及び該第二熱処理（Ａ２）を行った後、加熱温度から２２５℃まで６０℃／秒以下の平均冷却速度で冷却する冷却と、
該第二熱処理（Ａ２）後に、銅合金管を２２５℃±１００℃で１０～２０００分間加熱する時効処理（Ａ３）と、
を施すこと、
を特徴とする銅合金管の製造方法を提供するものである。
That is , the present invention ( 1 ) relates to a casting process for casting a copper alloy ingot containing 0.40 to 1.50 mass% Ni, 0.10 to 0.50 mass% P, and the balance being Cu and unavoidable impurities;
a hot working step of hot working the copper alloy ingot;
a cold working step of performing cold working after the hot working step;
having
After the hot working step, before the cold working step or after the cold working step, the copper alloy tube is heated at 800 to 1000°C, and then cooled from the heating temperature to 225°C at an average cooling rate of 100°C/sec or more to perform a solution treatment for solutionization.
After the solution treatment, a first heat treatment (A1) is performed in which the copper alloy tube is heated at 650±100°C for 10 to 600 minutes, and after the first heat treatment (A1), the copper alloy tube is cooled from the heating temperature to 300°C at an average cooling rate of 1°C/sec or less .
After the first heat treatment (A1), a second heat treatment (A2) is performed in which the copper alloy tube is heated at 850±100° C. for 10 to 1800 seconds , and after the second heat treatment (A2), the copper alloy tube is cooled from the heating temperature to 225° C. at an average cooling rate of 60° C./second or less .
After the second heat treatment (A2), the copper alloy tube is heated at 225°C ± 100°C for 10 to 2000 minutes (A3);
To carry out the following:
The present invention provides a method for producing a copper alloy tube, comprising the steps of:
また、本発明（２）は、前記第二熱処理（Ａ２）の加熱時間が６００秒以上であり、
前記第二熱処理（Ａ２）を行った後の冷却において、前記第二熱処理（Ａ２）加熱温度から２２５℃までの平均冷却速度が、１℃／秒以下であること、
を特徴とする（１）の銅合金管の製造方法を提供するものである。
In addition, the present invention ( 2 ) is characterized in that the heating time of the second heat treatment (A2) is 600 seconds or more,
In the cooling process after the second heat treatment (A2), the average cooling rate from the heating temperature of the second heat treatment (A2) to 225° C. is 1° C./sec or less;
The present invention provides a method for producing a copper alloy tube according to the above-mentioned ( 1 ).
本発明によれば、冷間加工後に、６５０℃±１００℃で加熱する熱処理が施された銅合金管であって、強度が高く且つ加工性に優れたＣｕ－Ｎｉ－Ｐ系の銅合金管を提供することができる。 According to the present invention, it is possible to provide a copper alloy tube that has been subjected to a heat treatment at 650°C ± 100°C after cold working, and is a Cu-Ni-P type copper alloy tube that has high strength and excellent workability.
本発明の銅合金管は、０．４０～１．５０質量％のＮｉと、０．１０～０．５０質量％のＰと、を含有し、残部Ｃｕ及び不可避不純物からなる銅合金からなり、
該銅合金は、銅合金を溶体化する溶体化処理と、該溶体化処理後に、６５０±１００℃で加熱する第一熱処理（Ａ１）と、該第一熱処理（Ａ１）後に、８５０±１００℃で加熱する第二熱処理（Ａ２）と、該第二熱処理（Ａ２）後に、２２５℃±１００℃で加熱する時効処理（Ａ３）と、が施された銅合金であること、
を特徴とする銅合金管である。
The copper alloy tube of the present invention is made of a copper alloy containing 0.40 to 1.50 mass% Ni, 0.10 to 0.50 mass% P, and the balance being Cu and unavoidable impurities;
The copper alloy is a copper alloy that has been subjected to a solution treatment for turning the copper alloy into a solution, a first heat treatment (A1) of heating the copper alloy at 650±100°C after the solution treatment, a second heat treatment (A2) of heating the copper alloy at 850±100°C after the first heat treatment (A1), and an aging treatment (A3) of heating the copper alloy at 225°C±100°C after the second heat treatment (A2);
The copper alloy tube is characterized by the above.
銅合金管は、先ず、所定の化学組成の銅合金鋳塊を鋳造し、その後、種々の加工や処理を行うことにより、製造されるが、本発明者らは、銅合金の種々の加工や処理を行う中で、特定の化学組成の銅合金、すなわち、０．４０～１．５０質量％のＮｉ、好ましくは０．７０～１．２０質量％のＮｉと、０．１０～０．５０質量％のＰ、好ましくは０．２０～０．４０質量％のＰと、を含有する銅合金を、溶体化処理し、その後に行う熱処理として、６５０±１００℃で加熱する第一熱処理（Ａ１）と、第一熱処理（Ａ１）後に、８５０±１００℃で加熱する第二熱処理（Ａ２）と、第二熱処理（Ａ２）後に、２２５℃±１００℃で加熱する時効処理（Ａ３）と、を行うことにより、銅合金管を形成する銅合金中に、Ｎｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物を析出させることができ、析出強化により銅合金材料の強度を向上させることができることを見出した。 A copper alloy tube is manufactured by first casting a copper alloy ingot having a predetermined chemical composition, and then carrying out various processing and treatment. The present inventors, in the course of carrying out various processing and treatment of copper alloys, have found that a copper alloy having a specific chemical composition, i.e., a copper alloy containing 0.40 to 1.50 mass% Ni, preferably 0.70 to 1.20 mass% Ni, and 0.10 to 0.50 mass% P, preferably 0.20 to 0.40 mass% P, is solution-treated, and then subjected to heat treatments including a first heat treatment (A1) in which the alloy is heated at 650±100°C, a second heat treatment (A2) in which the alloy is heated at 850±100°C after the first heat treatment (A1), and an aging treatment (A3) in which the alloy is heated at 225°C±100°C after the second heat treatment (A2), thereby containing Ni 12 P 5 and/or Ni 5 P in the copper alloy forming the copper alloy tube. It has been found that it is possible to precipitate a precipitate having the composition of No. 4 , and that the strength of the copper alloy material can be improved by precipitation strengthening.
本発明の銅合金管は、０．４０～１．５０質量％のＮｉと、０．１０～０．５０質量％のＰと、を含有し、残部Ｃｕ及び不可避不純物からなる銅合金により形成されている。なお、本発明において、上記Ｎｉ及びＰの含有量とは、時効処理（Ａ３）を施した後の銅合金管中のＮｉ及びＰの含有量を指す。 The copper alloy tube of the present invention is formed from a copper alloy containing 0.40 to 1.50 mass% Ni, 0.10 to 0.50 mass% P, with the balance being Cu and unavoidable impurities. In the present invention, the above Ni and P contents refer to the Ni and P contents in the copper alloy tube after aging treatment (A3) has been performed.
本発明の銅合金管のＮｉ含有量は、０．４０～１．５０質量％である。Ｎｉは、銅合金が２２５℃±１００℃で加熱された場合に、銅合金中でＰとの化合物によりＮｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物を形成し、引張強さを向上させる成分である。Ｎｉ含有量が上記範囲にあることにより、銅合金管の引張強さが高くなる。一方、Ｎｉ含有量が上記範囲を超えると、伸びが低くなってしまい、ヘアピン曲げ加工及び拡管性が低くなり、また、Ｎｉ含有量が上記範囲未満だと、銅合金管の強度が低くなってしまう。特に、強度が高く且つ加工性に優れる点で、本発明の銅合金管のＮｉ含有量は、０．７０～１．２０質量％であることが好ましい。 The Ni content of the copper alloy tube of the present invention is 0.40 to 1.50 mass%. Ni is a component that forms precipitates having a composition of Ni 12 P 5 and/or Ni 5 P 4 by a compound with P in the copper alloy when the copper alloy is heated at 225°C ± 100°C, thereby improving the tensile strength. When the Ni content is in the above range, the tensile strength of the copper alloy tube is high. On the other hand, when the Ni content exceeds the above range, the elongation is low, and the hairpin bending processability and pipe expansion property are low, and when the Ni content is less than the above range, the strength of the copper alloy tube is low. In particular, in terms of high strength and excellent processability, the Ni content of the copper alloy tube of the present invention is preferably 0.70 to 1.20 mass%.
本発明の銅合金管のＰ含有量は、０．１０～０．５０質量％である。Ｐは、銅合金が２２５℃±１００℃で加熱された場合に、銅合金中でＮｉとの化合物により、Ｎｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物を形成し、強度を向上させる成分である。Ｐ含有量が上記範囲にあることにより、銅合金管の強度が高くなる。一方、Ｐ含有量が上記範囲を超えると、加工性が低くなり、熱間加工や冷間加工において割れが生じるおそれがあり、また、Ｐ含有量が上記範囲未満だと、析出物の析出量が少なくなるため、銅合金材料の強度が低くなってしまう。特に、強度が高く且つ加工性に優れる点で、本発明の銅合金管のＰ含有量は、０．２０～０．４０質量％であることが好ましい。 The P content of the copper alloy tube of the present invention is 0.10 to 0.50 mass%. P is a component that forms precipitates having a composition of Ni 12 P 5 and/or Ni 5 P 4 by a compound with Ni in the copper alloy when the copper alloy is heated at 225 ° C. ± 100 ° C., thereby improving the strength. By having the P content in the above range, the strength of the copper alloy tube is increased. On the other hand, if the P content exceeds the above range, the workability is reduced and cracks may occur during hot working or cold working, and if the P content is less than the above range, the amount of precipitates is reduced, resulting in a reduced strength of the copper alloy material. In particular, the P content of the copper alloy tube of the present invention is preferably 0.20 to 0.40 mass% in terms of high strength and excellent workability.
本発明の銅合金管は、０．４０～１．５０質量％のＮｉ、好ましくは０．７０～１．２０質量％のＮｉと、０．１０～０．５０質量％のＰ、好ましくは０．２０～０．４０質量％のＰと、を含有し、残部Ｃｕ及び不可避不純物からなる銅合金を鋳造した後、種々の加工（例えば、熱間押出等の熱間加工、冷間圧延、冷間引抜等の冷間加工）、及び種々の熱処理を行う過程で、銅合金を加熱し、急冷する溶体化処理を行い、その後に行う熱処理として、６５０±１００℃で加熱する第一熱処理（Ａ１）と、第一熱処理（Ａ１）後に、８５０±１００℃で加熱する第二熱処理（Ａ２）と、第二熱処理（Ａ２）後に、２２５℃±１００℃で加熱する時効処理（Ａ３）と、を行うことにより得られる。 The copper alloy tube of the present invention is obtained by casting a copper alloy containing 0.40 to 1.50 mass% Ni, preferably 0.70 to 1.20 mass% Ni, 0.10 to 0.50 mass% P, preferably 0.20 to 0.40 mass% P, with the balance being Cu and unavoidable impurities, and then performing various processes (for example, hot processing such as hot extrusion, cold processing such as cold rolling and cold drawing) and various heat treatments, in which the copper alloy is heated and quenched in a solution treatment, and then performing the following heat treatments: a first heat treatment (A1) in which the alloy is heated at 650±100°C, a second heat treatment (A2) in which the alloy is heated at 850±100°C after the first heat treatment (A1), and an aging treatment (A3) in which the alloy is heated at 225°C±100°C after the second heat treatment (A2).
溶体化処理であるが、銅合金を８００～１０００℃、好ましくは８００～９５０℃に加熱した後、急冷する溶体化処理を行う。溶体化処理は、製造工程中のどこで行うかは、熱間加工前から冷間加工後までの間で適宜選択される。急冷は、例えば、加熱した銅合金を水冷することにより行われる。また、冷間加工を複数回行う場合は、熱間加工後且つ全ての冷間加工の前、冷間加工と冷間加工の間、又は全ての冷間加工の後に、銅合金を８００～１０００℃、好ましくは８００～９５０℃に加熱した後、急冷する溶体化処理を行う。また、熱間加工後に、熱間加工された銅合金を急冷することによって、溶体化処理を行うこともできる。なお、急冷とは、加熱温度から２２５℃までの平均冷却速度が１００℃／秒以上の冷却を指す。 The solution treatment is performed by heating the copper alloy to 800 to 1000°C, preferably 800 to 950°C, and then quenching. The time when the solution treatment is performed in the manufacturing process can be selected as appropriate between before hot working and after cold working. Quenching is performed, for example, by water cooling the heated copper alloy. In addition, when cold working is performed multiple times, the copper alloy is heated to 800 to 1000°C, preferably 800 to 950°C, after hot working and before all cold working, between cold working and cold working, or after all cold working, and then solution treatment is performed by quenching. In addition, solution treatment can also be performed by quenching the hot-worked copper alloy after hot working. Quenching refers to cooling at an average cooling rate of 100°C/sec or more from the heating temperature to 225°C.
第一熱処理（Ａ１）であるが、溶体化処理を行った後に、銅合金を６５０±１００℃で加熱する第一熱処理（Ａ１）を行う。第一熱処理（Ａ１）の加熱温度が、上記範囲にあることにより、時効処理（Ａ３）後に、銅合金中でＮｉとＰの化合物により、Ｎｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物を形成し、微細かつ均一な析出状態となり強度が高くなる。一方、第一熱処理（Ａ１）の加熱温度が、上記範囲未満だと、冷間加工後の加工組織が残り、再結晶が十分でなく、耐力値が高く伸びが低くなって、後に加工度の高い加工や複雑な加工を行う場合の加工性が低くなり、また、上記範囲を超えると、第一熱処理（Ａ１）後に析出物が粗大化して、時効処理（Ａ３）後の高強度に寄与しなくなる 。 Regarding the first heat treatment (A1), the copper alloy is heated at 650±100° C. after the solution treatment. When the heating temperature of the first heat treatment (A1) is within the above range, after the aging treatment (A3), precipitates having a composition of Ni 12 P 5 and/or Ni 5 P 4 are formed by the compounds of Ni and P in the copper alloy, resulting in a fine and uniform precipitation state and high strength. On the other hand, if the heating temperature of the first heat treatment (A1) is less than the above range, the processed structure after cold working remains, recrystallization is insufficient, the proof stress value is high and the elongation is low, and the workability when performing high processing or complex processing later is low. Also, if the heating temperature exceeds the above range, the precipitates become coarse after the first heat treatment (A1) and do not contribute to high strength after the aging treatment (A3).
第一熱処理（Ａ１）での熱処理時間は、好ましくは１０～６００分間、特に好ましくは３０～１２０分間である。第一熱処理（Ａ１）での熱処理時間が上記範囲にあることにより、時効処理（Ａ３）後に、銅合金管の強度向上効果を得ることができる程度に十分な量のＮｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物を析出させることができる。一方、第一熱処理（Ａ１）での熱処理時間が、上記範囲未満だと、時効処理（Ａ３）後のＮｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物の析出量が少なくなり易く、銅合金管の強度向上効果が得られ難くなり、また、上記範囲を超えると、第一熱処理（Ａ１）後の析出物が大きくなり、銅合金管の強度が低下し易くなる。 The heat treatment time in the first heat treatment (A1) is preferably 10 to 600 minutes, particularly preferably 30 to 120 minutes. By setting the heat treatment time in the first heat treatment (A1) within the above range, it is possible to precipitate a sufficient amount of precipitates having a composition of Ni 12 P 5 and/or Ni 5 P 4 to obtain the strength improvement effect of the copper alloy tube after the aging treatment (A3). On the other hand, if the heat treatment time in the first heat treatment (A1) is less than the above range, the amount of precipitates having a composition of Ni 12 P 5 and/or Ni 5 P 4 after the aging treatment (A3) tends to be small, making it difficult to obtain the strength improvement effect of the copper alloy tube, and if it exceeds the above range, the precipitates after the first heat treatment (A1) become large, and the strength of the copper alloy tube tends to decrease.
第一熱処理（Ａ１）を行った後の冷却において、第一熱処理（Ａ１）の加熱温度から３００℃までの平均冷却速度は任意に選定できるが、１℃／秒以下であることが好ましい。第一熱処理（Ａ１）を行った後の冷却における第一熱処理（Ａ１）の加熱温度から３００℃までの平均冷却速度が、上記範囲であることで、Ｎｉ２Ｐの組成を有する析出物の生成が促進され、強度が高くなって、第一熱処理（Ａ１）と第二熱処理（Ａ２）の間の加工工程、例えば、銅合金管を熱交換器に組み立てる加工工程や、ハンドリング時に発生する変形やキズ等を防止する効果がある。 In the cooling after the first heat treatment (A1), the average cooling rate from the heating temperature of the first heat treatment (A1) to 300° C. can be selected arbitrarily, but is preferably 1° C./sec or less. By setting the average cooling rate from the heating temperature of the first heat treatment (A1) to 300° C. in the above range in the cooling after the first heat treatment (A1), the formation of precipitates having a composition of Ni 2 P is promoted, the strength is increased, and there is an effect of preventing deformation and scratches that occur during processing steps between the first heat treatment (A1) and the second heat treatment (A2), for example, a processing step of assembling a copper alloy tube into a heat exchanger, and during handling.
第二熱処理（Ａ２）であるが、第一熱処理（Ａ１）を行った後に、銅合金を８５０±１００℃で加熱する第二熱処理（Ａ２）を行う。第二熱処理（Ａ２）の加熱温度が、上記範囲にあることにより、Ｎｉ２Ｐの組成を有する析出物を少なくとも一部に含むＣｕ－Ｎｉ－Ｐ系の析出物が得られる。一方、第二熱処理（Ａ２）の加熱温度が、上記範囲未満だと、第二熱処理（Ａ２）後の冷却過程で、Ｎｉ２Ｐの組成を有する析出物が析出し難く、また、上記範囲を超えても、Ｎｉ２Ｐの組成を有する析出物が析出し難い。また、第二熱処理（Ａ２）の加熱温度が、上記範囲未満だと、冷却過程で析出に十分な時間を確保できず、また、上記範囲を超えると、結晶粒が粗大化し過ぎた結晶組織となる。 Regarding the second heat treatment (A2), after the first heat treatment (A1), the copper alloy is heated at 850±100° C. The heating temperature of the second heat treatment (A2) is within the above range, so that a Cu—Ni—P-based precipitate containing at least a part of a precipitate having a composition of Ni 2 P can be obtained. On the other hand, if the heating temperature of the second heat treatment (A2) is less than the above range, the precipitate having a composition of Ni 2 P is difficult to precipitate in the cooling process after the second heat treatment (A2), and even if the heating temperature exceeds the above range, the precipitate having a composition of Ni 2 P is difficult to precipitate. Also, if the heating temperature of the second heat treatment (A2) is less than the above range, sufficient time for precipitation cannot be secured in the cooling process, and if the heating temperature exceeds the above range, the crystal structure has excessively coarsened crystal grains.
第二熱処理（Ａ２）での加熱時間は、好ましくは１０～１８００秒間である。 The heating time in the second heat treatment (A2) is preferably 10 to 1800 seconds.
第二熱処理（Ａ２）を行った後の冷却において、第二熱処理（Ａ２）の加熱温度から２２５℃までの平均冷却速度を、６０℃／秒以下とすることで、Ｎｉ２Ｐの組成を有する析出物が析出し易く、時効処理（Ａ３）により強度に寄与するＮｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物が析出し易くなる。第二熱処理（Ａ２）の加熱温度から２２５℃までの平均冷却速度は、より好ましくは、１℃／秒以下である。第二熱処理（Ａ２）の加熱温度から２２５℃までの平均冷却速度を、１℃／秒以下とすることで、時効処理（Ａ３）後の材料強度をより高くすることができる。 In the cooling after the second heat treatment (A2), by setting the average cooling rate from the heating temperature of the second heat treatment (A2) to 225°C to 60°C/sec or less, precipitates having a composition of Ni2P are easily precipitated, and precipitates having a composition of Ni12P5 and /or Ni5P4 that contribute to strength by the aging treatment (A3) are easily precipitated. The average cooling rate from the heating temperature of the second heat treatment (A2) to 225°C is more preferably 1°C/sec or less. By setting the average cooling rate from the heating temperature of the second heat treatment (A2) to 225°C to 1°C/sec or less, the material strength after the aging treatment (A3) can be further increased.
本発明の銅合金管が、ルームエアコン、パッケージエアコン等の空調機用熱交換器又は冷凍機等の伝熱管又は冷媒配管の場合、空調機用熱交換器又は冷凍機等は、管材を他の部材と共に組み付けた後、ろう付け加熱することにより、管材と他の部材をろう付けして製造されるが、このろう付け加熱を、本発明の銅合金管に係る第二熱処理（Ａ２）とすることができる。つまり、０．４０～１．５０質量％のＮｉ、好ましくは０．７０～１．２０質量％のＮｉと、０．１０～０．５０質量％のＰ、好ましくは０．２０～０．４０質量％のＰと、を含有し、残部Ｃｕ及び不可避不純物からなる銅合金である鋳塊を用いて熱間加工及び冷間加工を行い管材の形状に加工し、且つ、溶体化処理及び第一熱処理（Ａ１）を行った管材を、空調機用熱交換器又は冷凍機を構成する他の部材と共に組み付け、次いで、８５０℃±１００℃で加熱し、冷却して、管材と他の部材をろう付けすることにより、第二熱処理（Ａ２）を行い、時効処理（Ａ３）前の銅合金管を得ることもできる。第二熱処理（Ａ２）後の冷却における冷却方式としては、例えば、加熱温度から２２５℃までの平均冷却速度が２５～５０℃／秒の場合は、強制空冷等の冷却方式が挙げられ、また、加熱温度から２２５℃までの平均冷却速度が２０℃／秒以下の場合は、自然空冷等の冷却方式が挙げられ、さらに加熱温度から２２５℃までの平均冷却速度が１℃／秒以下の場合は、炉冷等の冷却方式が挙げられる。炉中ろう付けの場合、第二熱処理（Ａ２）での加熱時間は６００秒以上となる場合が多い。 When the copper alloy tube of the present invention is a heat transfer tube or refrigerant piping for a heat exchanger or a refrigerator for an air conditioner such as a room air conditioner or a packaged air conditioner, the heat exchanger or the refrigerator for the air conditioner is manufactured by assembling the tube material with other components and then brazing the tube material to the other components by brazing heating, and this brazing heating can be the second heat treatment (A2) for the copper alloy tube of the present invention. That is, a copper alloy ingot containing 0.40 to 1.50 mass% Ni, preferably 0.70 to 1.20 mass% Ni, 0.10 to 0.50 mass% P, preferably 0.20 to 0.40 mass% P, with the balance being Cu and unavoidable impurities, is hot worked and cold worked into a pipe shape, and the pipe material that has been subjected to solution treatment and first heat treatment (A1) is assembled with other members that constitute an air conditioner heat exchanger or a refrigerator, and then heated at 850°C ± 100°C, cooled, and brazed to the pipe material and other members, thereby performing second heat treatment (A2) to obtain a copper alloy pipe before aging treatment (A3). Examples of cooling methods for cooling after the second heat treatment (A2) include forced air cooling when the average cooling rate from the heating temperature to 225°C is 25 to 50°C/sec, natural air cooling when the average cooling rate from the heating temperature to 225°C is 20°C/sec or less, and furnace cooling when the average cooling rate from the heating temperature to 225°C is 1°C/sec or less. In the case of furnace brazing, the heating time in the second heat treatment (A2) is often 600 seconds or more.
時効処理（Ａ３）であるが、第二熱処理（Ａ２）を行った後に、銅合金を２２５±１００℃で加熱する時効熱処理（Ａ３）を行う。時効処理（Ａ３）の加熱温度が、上記範囲にあることにより、Ｎｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物を少なくとも一部に含むＣｕ－Ｎｉ－Ｐ系の析出物が得られる。一方、時効処理（Ａ３）の加熱温度が、上記範囲未満だと、Ｎｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物が析出し難く、また、上記範囲を超えても、Ｎｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物が析出し難い。 In the aging treatment (A3), after the second heat treatment (A2), the copper alloy is heated at 225±100° C. The heating temperature of the aging treatment (A3) is within the above range, so that a Cu—Ni—P-based precipitate containing at least a part of a precipitate having a composition of Ni 12 P 5 and/or Ni 5 P 4 can be obtained. On the other hand, if the heating temperature of the aging treatment (A3) is less than the above range, the precipitate having a composition of Ni 12 P 5 and/or Ni 5 P 4 is difficult to precipitate, and even if the heating temperature exceeds the above range, the precipitate having a composition of Ni 12 P 5 and/or Ni 5 P 4 is difficult to precipitate.
時効処理（Ａ３）での加熱時間は、好ましくは１０～２０００分間、特に好ましくは３０～１０００分間である。時効処理（Ａ３）での加熱時間が上記範囲にあることにより、銅合金管の強度向上効果を得ることができる程度に十分な量のＮｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物を析出させることができる。一方、時効処理（Ａ３）での加熱時間が、上記範囲未満だと、Ｎｉ１２Ｐ５及び／又はＮｉ５Ｐ４の組成を有する析出物の析出量が少なくなり易く、銅合金管の強度向上効果が得られ難くなり、また、上記範囲を超えると、析出物が大きくなり、銅合金管の強度が低下し易くなる。 The heating time in the aging treatment (A3) is preferably 10 to 2000 minutes, particularly preferably 30 to 1000 minutes. By the heating time in the aging treatment (A3) being within the above range, it is possible to precipitate a sufficient amount of precipitates having a composition of Ni 12 P 5 and/or Ni 5 P 4 to the extent that the strength improvement effect of the copper alloy tube can be obtained. On the other hand, if the heating time in the aging treatment (A3) is less than the above range, the amount of precipitates having a composition of Ni 12 P 5 and/or Ni 5 P 4 tends to be small, making it difficult to obtain the strength improvement effect of the copper alloy tube, and if it exceeds the above range, the precipitates become large, making it easy for the strength of the copper alloy tube to decrease.
なお、本発明において、「溶体化処理後に第一熱処理（Ａ１）が施された」とは、銅合金に、溶体化処理が施された直後に、第一熱処理（Ａ１）が施されることのみを指すのではなく、溶体化処理と第一熱処理（Ａ１）の間に、「加熱を伴わない処理又は工程」及び／又は「３２５℃を超える温度で加熱される処理又は工程」が施されてもよい。つまり、銅合金に、溶体化処理が施された直後に、第一熱処理（Ａ１）が施されてもよいし、あるいは、溶体化処理が施された後に、「加熱を伴わない処理又は工程」及び／又は「３２５℃を超える温度で加熱される処理又は工程」が施されてから、第一熱処理（Ａ１）が施されてもよい。また、溶体化処理が施された後、第一熱処理（Ａ１）が施されるまでの間に、本発明の効果に影響しない程度の短時間であれば、１２５～３２５℃の範囲の温度に銅合金が晒されることがあってもよい。例えば、溶体化処理が施された後、第一熱処理（Ａ１）が施されるまでの間に、３２５℃を超える温度で加熱される処理又は工程を施す場合においては、所定の温度までの昇温のために１２５～３２５℃の温度範囲を通過することになるが、１２５～３２５℃の温度範囲を通過する時間が、本発明の効果に影響しない程度の短時間であれば、許容される。 In the present invention, "the first heat treatment (A1) was performed after the solution treatment" does not only mean that the copper alloy is subjected to the first heat treatment (A1) immediately after the solution treatment, but also means that a "treatment or step not involving heating" and/or a "treatment or step involving heating at a temperature exceeding 325°C" may be performed between the solution treatment and the first heat treatment (A1). In other words, the copper alloy may be subjected to the first heat treatment (A1) immediately after the solution treatment, or may be subjected to a "treatment or step not involving heating" and/or a "treatment or step involving heating at a temperature exceeding 325°C" after the solution treatment, and then the first heat treatment (A1). In addition, the copper alloy may be exposed to a temperature in the range of 125 to 325°C between the solution treatment and the first heat treatment (A1) for a short period of time that does not affect the effects of the present invention. For example, if a treatment or process involving heating at a temperature exceeding 325°C is performed after the solution treatment and before the first heat treatment (A1) is performed, the material will pass through a temperature range of 125 to 325°C in order to raise the temperature to the specified temperature, but this is acceptable as long as the time spent passing through the temperature range of 125 to 325°C is short enough that it does not affect the effects of the present invention.
また、本発明において、「第一熱処理（Ａ１）後に第二熱処理（Ａ２）が施された」とは、銅合金に、第一熱処理（Ａ１）が施された直後に、第二熱処理（Ａ２）が施されることのみを指すのではなく、第一熱処理（Ａ１）と第二熱処理（Ａ２）の間に、「加熱を伴わない処理又は工程」及び／又は「３２５℃を超える温度で加熱される処理又は工程」が施されてもよい。つまり、銅合金に、第一熱処理（Ａ１）が施された直後に、第二熱処理（Ａ２）が施されてもよいし、あるいは、第一熱処理（Ａ１）が施された後に、「加熱を伴わない処理又は工程」及び／又は「３２５℃を超える温度で加熱される処理又は工程」が施されてから、第二熱処理（Ａ２）が施されてもよい。また、第一熱処理（Ａ１）が施された後、第二熱処理（Ａ２）が施されるまでの間に、本発明の効果に影響しない程度の短時間であれば、１２５～３２５℃の範囲の温度に銅合金が晒されることがあってもよい。例えば、第一熱処理（Ａ１）が施された後、第二熱処理（Ａ２）が施されるまでの間に、３２５℃を超える温度で加熱される処理又は工程を施す場合においては、所定の温度までの昇温のために１２５～３２５℃の温度範囲を通過することになるが、１２５～３２５℃の温度範囲を通過する時間が、本発明の効果に影響しない程度の短時間であれば、許容される。 In addition, in the present invention, "the second heat treatment (A2) was performed after the first heat treatment (A1)" does not only mean that the copper alloy is subjected to the second heat treatment (A2) immediately after the first heat treatment (A1), but also means that a "treatment or step not involving heating" and/or a "treatment or step involving heating at a temperature exceeding 325°C" may be performed between the first heat treatment (A1) and the second heat treatment (A2). In other words, the copper alloy may be subjected to the second heat treatment (A2) immediately after the first heat treatment (A1), or may be subjected to a "treatment or step not involving heating" and/or a "treatment or step involving heating at a temperature exceeding 325°C" after the first heat treatment (A1) and then the second heat treatment (A2). In addition, the copper alloy may be exposed to a temperature in the range of 125 to 325°C between the first heat treatment (A1) and the second heat treatment (A2) as long as it is for a short period of time that does not affect the effects of the present invention. For example, if a treatment or process involving heating at a temperature exceeding 325°C is performed between the first heat treatment (A1) and the second heat treatment (A2), the material will pass through a temperature range of 125 to 325°C in order to raise the temperature to the specified temperature, but this is acceptable as long as the time spent passing through the temperature range of 125 to 325°C is short enough that it does not affect the effects of the present invention.
また、本発明において、「第二熱処理（Ａ２）後に時効処理（Ａ３）が施された」とは、銅合金に、第二熱処理（Ａ２）が施された直後に、時効処理（Ａ３）が施されることのみを指すのではなく、第二熱処理（Ａ２）と時効処理（Ａ３）の間に、「加熱を伴わない処理又は工程」及び／又は「３２５℃を超える温度で加熱される処理又は工程」が施されてもよい。つまり、銅合金に、第二熱処理（Ａ２）が施された直後に、時効処理（Ａ３）が施されてもよいし、あるいは、第二熱処理（Ａ２）が施された後に、「加熱を伴わない処理又は工程」及び／又は「３２５℃を超える温度で加熱される処理又は工程」が施されてから、時効処理（Ａ３）が施されてもよい。また、第二熱処理（Ａ２）が施された後、時効処理（Ａ３）が施されるまでの間に、本発明の効果に影響しない程度の短時間であれば、１２５～３２５℃の範囲の温度に銅合金が晒されることがあってもよい。例えば、第二熱処理（Ａ２）が施された後、時効処理（Ａ３）が施されるまでの間に、３２５℃を超える温度で加熱される処理又は工程を施す場合においては、所定の温度までの昇温のために１２５～３２５℃の温度範囲を通過することになるが、１２５～３２５℃の温度範囲を通過する時間が、本発明の効果に影響しない程度の短時間であれば、許容される。 In addition, in the present invention, "the aging treatment (A3) was performed after the second heat treatment (A2)" does not only mean that the copper alloy is subjected to the aging treatment (A3) immediately after the second heat treatment (A2), but also means that a "treatment or step not involving heating" and/or a "treatment or step involving heating at a temperature exceeding 325°C" may be performed between the second heat treatment (A2) and the aging treatment (A3). In other words, the copper alloy may be subjected to the aging treatment (A3) immediately after the second heat treatment (A2), or may be subjected to the "treatment or step not involving heating" and/or the "treatment or step involving heating at a temperature exceeding 325°C" after the second heat treatment (A2) and then the aging treatment (A3). In addition, the copper alloy may be exposed to a temperature in the range of 125 to 325°C between the second heat treatment (A2) and the aging treatment (A3) for a short period of time that does not affect the effects of the present invention. For example, if a treatment or process is performed in which the material is heated to a temperature exceeding 325°C after the second heat treatment (A2) and before the aging treatment (A3) is performed, the material will pass through a temperature range of 125 to 325°C in order to raise the temperature to the specified temperature. However, this is permissible as long as the time spent passing through the temperature range of 125 to 325°C is short enough that it does not affect the effects of the present invention.
本発明の銅合金管のビッカース硬さは、好ましくは１２５ＨＶ以上、特に好ましくは１３０ＨＶ以上である。 The Vickers hardness of the copper alloy tube of the present invention is preferably 125 HV or more, and particularly preferably 130 HV or more.
本発明の銅合金管の製造方法は、０．４０～１．５０質量％のＮｉと、０．１０～０．５０質量％のＰと、を含有し、残部Ｃｕ及び不可避不純物からなる銅合金鋳塊を鋳造する鋳造工程と、
該銅合金鋳塊を、熱間で加工する熱間加工工程と、
該熱間加工工程後に、冷間加工を行う冷間加工工程と、
を有し、
該熱間加工工程後、該冷間加工工程前又は該冷間加工工程後に、銅合金管を溶体化する溶体化処理と、
該溶体化処理後に、銅合金管を６５０±１００℃で加熱する第一熱処理（Ａ１）と、
該第一熱処理（Ａ１）後に、銅合金管を８５０±１００℃で加熱する第二熱処理（Ａ２）と、
該第二熱処理（Ａ２）後に、銅合金管を２２５℃±１００℃で加熱する時効処理（Ａ３）と、
を施すこと、
を特徴とする銅合金管の製造方法である。
The method for producing a copper alloy tube of the present invention includes a casting step of casting a copper alloy ingot containing 0.40 to 1.50 mass% Ni, 0.10 to 0.50 mass% P, and the remainder being Cu and unavoidable impurities;
a hot working step of hot working the copper alloy ingot;
a cold working step of performing cold working after the hot working step;
having
a solution treatment for solutionizing the copper alloy tube after the hot working step, before the cold working step, or after the cold working step;
A first heat treatment (A1) of heating the copper alloy tube at 650±100° C. after the solution treatment;
After the first heat treatment (A1), a second heat treatment (A2) is performed in which the copper alloy tube is heated at 850±100° C.;
After the second heat treatment (A2), the copper alloy tube is heated at 225°C ± 100°C for aging treatment (A3);
To carry out the following:
The present invention relates to a method for producing a copper alloy tube.
本発明の銅合金管の製造方法は、鋳造工程と、熱間加工工程と、冷間加工工程と、を有する。 The manufacturing method of the copper alloy tube of the present invention includes a casting process, a hot working process, and a cold working process.
鋳造工程は、常法に従って、溶解、鋳造し、０．４０～１．５０質量％のＮｉと、０．１０～０．５０質量％のＰと、を含有し、残部Ｃｕ及び不可避不純物からなる銅合金鋳塊（ビレット）を得る工程である。鋳造工程では、例えば、銅の地金、工程内リサイクル材、Ｃｕ－Ｎｉ母合金、Ｃｕ－Ｐ母合金等を配合して、Ｎｉ及びＰ含有量が所定の含有量となるように成分調整を行い、次いで、高周波溶解炉等を用いて、ビレットを鋳造する。 The casting process involves melting and casting according to conventional methods to obtain a copper alloy ingot (billet) containing 0.40-1.50% by mass of Ni, 0.10-0.50% by mass of P, with the remainder being Cu and unavoidable impurities. In the casting process, for example, copper ingot, in-process recycled material, Cu-Ni mother alloy, Cu-P mother alloy, etc. are mixed and the composition is adjusted so that the Ni and P contents are the specified contents, and then the billet is cast using a high-frequency melting furnace, etc.
熱間加工工程では、鋳造工程を行い得られる銅合金鋳塊（ビレット）を、熱間押出して、銅合金鋳塊を熱間加工する。熱間押出では、熱間押出前にビレットを所定の温度で加熱した後、熱間押出加工を行う。熱間押出は、マンドレル押出によって行われる。すなわち、加熱前に、冷間で予め穿孔したビレット、あるいは、押出前に熱間で穿孔したビレットに、マンドレルを挿入した状態で、熱間押出を行なって、継目無銅合金管を得る。 In the hot working process, the copper alloy ingot (billet) obtained in the casting process is hot extruded to hot work the copper alloy ingot. In hot extrusion, the billet is heated to a specified temperature before hot extrusion, and then hot extrusion processing is performed. Hot extrusion is performed by mandrel extrusion. That is, a seamless copper alloy pipe is obtained by inserting a mandrel into a billet that has been cold-pierced before heating, or into a billet that has been hot-pierced before extrusion.
なお、熱間押出において、水中に銅合金管を押出して、急冷を行うことにより、溶体化処理を行うことができる。 In addition, in hot extrusion, solution treatment can be performed by extruding the copper alloy pipe into water and then quenching it.
冷間加工工程では、熱間加工工程後に、冷却後の銅合金管を、冷間圧延又は冷間抽伸して、管の外径及び肉厚を減じていく冷間加工を行う。冷間加工工程では、複数回、冷間加工を行うことができる。 In the cold working process, after the hot working process, the cooled copper alloy tube is cold rolled or cold drawn to reduce the outside diameter and wall thickness of the tube. In the cold working process, cold working can be performed multiple times.
また、冷間加工工程後に、４００～７００℃の保持温度で加熱する中間焼鈍処理を行った後に、転造加工を行うことができる。転造加工は、銅合金管の内面に、内面溝を形成させる転造加工を行う工程であり、中間焼鈍処理後の継目無銅合金管内に、外面にらせん状の溝加工を施した転造プラグを配置して、高速回転する複数の転造ボールによって、管の外側から押圧して、管の内面に転造プラグの溝を転写することにより行われる。また、通常、中間焼鈍処理を行った後、縮径加工を行ってから、転造加工を行う。 After the cold working process, an intermediate annealing process is performed in which the tube is heated at a holding temperature of 400 to 700°C, and then rolling is performed. Rolling is a process in which an inner groove is formed on the inner surface of the copper alloy tube. A rolling plug with a spiral groove on its outer surface is placed inside the seamless copper alloy tube after the intermediate annealing process, and multiple rolling balls rotating at high speed are used to press the tube from the outside, transferring the groove of the rolling plug to the inner surface of the tube. In addition, rolling is usually performed after the intermediate annealing process, followed by diameter reduction.
本発明の銅合金管の製造方法では、銅合金管を溶体化する溶体化処理と、銅合金管を６５０±１００℃で加熱する第一熱処理（Ａ１）と、第一熱処理（Ａ１）後に、銅合金管を８５０±１００℃で加熱する第二熱処理（Ａ２）と、第二熱処理（Ａ２）後に、銅合金管を２２５℃±１００℃で加熱する時効処理（Ａ３）と、を施す。 In the method for manufacturing copper alloy tubes of the present invention, the copper alloy tube is subjected to a solution treatment to bring the copper alloy tube into solution, a first heat treatment (A1) in which the copper alloy tube is heated to 650±100°C, a second heat treatment (A2) in which the copper alloy tube is heated to 850±100°C after the first heat treatment (A1), and an aging treatment (A3) in which the copper alloy tube is heated to 225°C±100°C after the second heat treatment (A2).
本発明の銅合金管の製造方法に係る溶体化処理、第一熱処理（Ａ１）、第二熱処理（Ａ２）及び時効処理（Ａ３）は、本発明の銅合金管に係る溶体化処理、第一熱処理（Ａ１）、第二熱処理（Ａ２）及び時効処理（Ａ３）と同様である。 The solution treatment, first heat treatment (A1), second heat treatment (A2) and aging treatment (A3) in the manufacturing method of the copper alloy tube of the present invention are the same as the solution treatment, first heat treatment (A1), second heat treatment (A2) and aging treatment (A3) in the copper alloy tube of the present invention.
本発明の銅合金管は、ルームエアコン、パッケージエアコン等の空調機用熱交換器又は冷凍機等の伝熱管又は冷媒配管として、好適に用いられる。また、本発明の銅合金管には、内面に溝のないベアー管と、内面に溝を有する内面溝付管がある。 The copper alloy tube of the present invention is suitable for use as a heat exchanger for air conditioners such as room air conditioners and packaged air conditioners, or as a heat transfer tube or refrigerant piping for refrigerators, etc. The copper alloy tube of the present invention includes bare tubes with no grooves on the inner surface and inner grooved tubes with grooves on the inner surface.
（実施例）
（１）Ｎｉ：０．９３質量％、Ｐ：０．２４質量％、残部Ｃｕ及び不可避不純物からなる銅合金鋳塊を溶解及び鋳造し、熱間押出用のビレットを作製した。
（２）上記ビレットを加熱し、９００℃にて熱間押出を行い、押出素管を得た。次いで、熱間押出した押出素管を、水中に押出して急冷した（溶体化処理）。
・押出前に熱間で内径約７５ｍｍ穿孔した。
・押出素管の外径は１０２ｍｍ、内径は７５ｍｍであった。
（３）上記押出素管を、冷間圧延し、冷間圧延素管を得た。次いで、該冷間圧延素管を、冷間にて抽伸を複数回行い、抽伸管を得た。
・抽伸管の外径は７．０ｍｍ、肉厚は１．０ｍｍであった。
（４）上記抽伸管に、第一の熱処理（第一熱処理（Ａ１））、第二の熱処理（第二熱処理（Ａ２））及び時効処理（Ａ３）を行い、銅合金管を得た。
＜第一の熱処理＞
・熱処理温度：７００℃
・熱処理時間：１８００秒
＜第一の熱処理後の冷却＞
・第一の熱処理の熱処理温度から３００℃までの平均冷却速度：０．２℃／秒
＜第二の熱処理＞
・熱処理温度：８５０℃
・熱処理時間：表１に示す時間
＜第二の熱処理後の冷却＞
・第二の熱処理の熱処理温度から２２５℃までの平均冷却速度：表１に示す速度
＜時効処理（Ａ３）＞
・熱処理温度：２２５℃
・熱処理時間：表１に示す時間
（５）第一の熱処理後の銅合金管及び時効処理後の銅合金管のビッカース硬さをそれぞれ測定した。その結果を表１に示す。
(Example)
(1) A copper alloy ingot consisting of 0.93 mass % Ni, 0.24 mass % P, the balance being Cu and unavoidable impurities, was melted and cast to prepare a billet for hot extrusion.
(2) The billet was heated and hot extruded at 900° C. to obtain an extruded raw pipe. The hot extruded raw pipe was then extruded into water and quenched (solution treatment).
Before extrusion, a hole having an inner diameter of about 75 mm was drilled while hot.
The outer diameter of the extruded raw tube was 102 mm, and the inner diameter was 75 mm.
(3) The extruded tube was cold-rolled to obtain a cold-rolled tube, which was then cold-drawn several times to obtain a drawn tube.
The outer diameter of the drawn pipe was 7.0 mm and the wall thickness was 1.0 mm.
(4) The drawn pipe was subjected to a first heat treatment (first heat treatment (A1)), a second heat treatment (second heat treatment (A2)) and an aging treatment (A3) to obtain a copper alloy pipe.
<First Heat Treatment>
Heat treatment temperature: 700°C
Heat treatment time: 1800 seconds <Cooling after first heat treatment>
Average cooling rate from the heat treatment temperature of the first heat treatment to 300° C.: 0.2° C./sec. <Second heat treatment>
Heat treatment temperature: 850°C
Heat treatment time: Time shown in Table 1 <Cooling after second heat treatment>
Average cooling rate from the heat treatment temperature of the second heat treatment to 225° C.: Rate shown in Table 1 <Aging treatment (A3)>
Heat treatment temperature: 225°C
Heat treatment time: Time shown in Table 1. (5) The Vickers hardness of the copper alloy tube after the first heat treatment and the copper alloy tube after the aging treatment was measured. The results are shown in Table 1.
（比較例１～４）
（１）、（２）及び（３）は、実施例と同様に行った。
（４）得られた冷間圧延管に、第一の熱処理及び第二の熱処理を行い、銅合金管を得た。つまり、第二の熱処理を行った後に、時効処理を行わない。
＜第一の熱処理＞
・熱処理温度：７００℃
・熱処理時間：１８００秒
＜第一の熱処理後の冷却＞
・第一の熱処理の熱処理温度から３００℃までの平均冷却速度：０．２℃／秒
＜第二の熱処理＞
・熱処理温度：８５０℃
・熱処理時間：表１に示す時間
＜第二の熱処理後の冷却＞
・第二の熱処理の熱処理温度から２２５℃までの平均冷却速度：表１に示す速度
（５）第一の熱処理後の銅合金管及び第二の熱処理後の銅合金管のビッカース硬さをそれぞれ測定した。その結果を表１に示す。
(Comparative Examples 1 to 4)
(1), (2) and (3) were carried out in the same manner as in the example.
(4) The obtained cold-rolled tube was subjected to a first heat treatment and a second heat treatment to obtain a copper alloy tube. In other words, after the second heat treatment, no aging treatment was performed.
<First Heat Treatment>
Heat treatment temperature: 700°C
Heat treatment time: 1800 seconds <Cooling after first heat treatment>
Average cooling rate from the heat treatment temperature of the first heat treatment to 300° C.: 0.2° C./sec. <Second heat treatment>
Heat treatment temperature: 850°C
Heat treatment time: Time shown in Table 1 <Cooling after second heat treatment>
Average cooling rate from the heat treatment temperature of the second heat treatment to 225°C: Rate shown in Table 1 (5) The Vickers hardness of the copper alloy tube after the first heat treatment and the copper alloy tube after the second heat treatment were measured. The results are shown in Table 1.
２）時効処理後の銅合金管のビッカース硬さ
Claims (2)
該銅合金鋳塊を、熱間で加工する熱間加工工程と、
該熱間加工工程後に、冷間加工を行う冷間加工工程と、
を有し、
該熱間加工工程後、該冷間加工工程前又は該冷間加工工程後に、銅合金管を８００～１０００℃で加熱した後、加熱温度から２２５℃まで１００℃／秒以上の平均冷却速度で冷却することにより溶体化する溶体化処理と、
該溶体化処理後に、銅合金管を６５０±１００℃で１０～６００分間加熱する第一熱処理（Ａ１）及び該第一熱処理（Ａ１）を行った後、加熱温度から３００℃まで１℃／秒以下の平均冷却速度で冷却する冷却と、
該第一熱処理（Ａ１）後に、銅合金管を８５０±１００℃で１０～１８００秒間加熱する第二熱処理（Ａ２）及び該第二熱処理（Ａ２）を行った後、加熱温度から２２５℃まで６０℃／秒以下の平均冷却速度で冷却する冷却と、
該第二熱処理（Ａ２）後に、銅合金管を２２５℃±１００℃で１０～２０００分間加熱する時効処理（Ａ３）と、
を施すこと、
を特徴とする銅合金管の製造方法。 A casting step of casting a copper alloy ingot containing 0.40 to 1.50 mass% Ni, 0.10 to 0.50 mass% P, and the balance being Cu and unavoidable impurities;
a hot working step of hot working the copper alloy ingot;
a cold working step of performing cold working after the hot working step;
having
After the hot working step, before the cold working step or after the cold working step, the copper alloy tube is heated at 800 to 1000°C, and then cooled from the heating temperature to 225°C at an average cooling rate of 100°C/sec or more to perform a solution treatment for solutionization.
After the solution treatment, a first heat treatment (A1) is performed in which the copper alloy tube is heated at 650±100°C for 10 to 600 minutes , and after the first heat treatment (A1), the copper alloy tube is cooled from the heating temperature to 300°C at an average cooling rate of 1°C/sec or less .
After the first heat treatment (A1), a second heat treatment (A2) is performed in which the copper alloy tube is heated at 850±100° C. for 10 to 1800 seconds , and after the second heat treatment (A2), the copper alloy tube is cooled from the heating temperature to 225° C. at an average cooling rate of 60° C./second or less .
After the second heat treatment (A2), the copper alloy tube is heated at 225°C ± 100°C for 10 to 2000 minutes (A3);
To carry out the following:
A method for producing a copper alloy tube, comprising the steps of:
前記第二熱処理（Ａ２）を行った後の冷却において、前記第二熱処理（Ａ２）加熱温度から２２５℃までの平均冷却速度が、１℃／秒以下であること、
を特徴とする請求項１記載の銅合金管の製造方法。 The heating time of the second heat treatment (A2) is 600 seconds or more,
In the cooling process after the second heat treatment (A2), the average cooling rate from the heating temperature of the second heat treatment (A2) to 225° C. is 1° C./sec or less;
The method for producing a copper alloy tube according to claim 1 ,
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| JP2007039735A (en) | 2005-08-03 | 2007-02-15 | Kobe Steel Ltd | Manufacturing method of irregular cross-section copper alloy sheet |
| WO2015122423A1 (en) | 2014-02-12 | 2015-08-20 | 株式会社Uacj | Copper alloy material and copper alloy pipe |
| JP2017082301A (en) | 2015-10-29 | 2017-05-18 | 株式会社Uacj | Copper alloy tube manufacturing method and heat exchanger |
| CN111424224A (en) | 2020-05-18 | 2020-07-17 | 中南大学 | Preparation method of high-strength high-toughness conductive copper alloy strip |
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| JPH0222433A (en) * | 1988-04-26 | 1990-01-25 | Mitsubishi Electric Corp | Copper alloy for electronic equipment |
| FR2751990B1 (en) * | 1996-07-30 | 1998-10-02 | Griset Ets | COPPER-BASED ALLOY WITH HIGH ELECTRICAL CONDUCTIVITY AND SOFTENING TEMPERATURE FOR ELECTRONIC APPLICATIONS |
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|---|---|---|---|---|
| JP2007039735A (en) | 2005-08-03 | 2007-02-15 | Kobe Steel Ltd | Manufacturing method of irregular cross-section copper alloy sheet |
| WO2015122423A1 (en) | 2014-02-12 | 2015-08-20 | 株式会社Uacj | Copper alloy material and copper alloy pipe |
| JP2017082301A (en) | 2015-10-29 | 2017-05-18 | 株式会社Uacj | Copper alloy tube manufacturing method and heat exchanger |
| CN111424224A (en) | 2020-05-18 | 2020-07-17 | 中南大学 | Preparation method of high-strength high-toughness conductive copper alloy strip |
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