Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C9/00—Alloys based on copper
  • C22C9/06—Alloys based on copper with nickel or cobalt 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
  • 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 copper alloy material such as a copper alloy tube having high strength and excellent workability and heat resistance.
• Patent Document 1 Japanese Patent Laid-Open No. 4-218631.
• This Cu-Ni-P-based copper alloy is a copper alloy that is precipitation-strengthened by Ni-P-based precipitates. After solution treatment, heat treatment (aging treatment) at an appropriate temperature is performed to achieve high strength. It becomes.
• the Cu-Ni-P-based copper alloy is used to produce the same material in various forms such as plates and pipes. However, depending on the application and use conditions, strength processing may be performed.
• a Ni—P-based copper alloy material is required to have not only high strength but also good workability, and a copper material having good elongation is required.
• heat exchangers for air conditioners such as room air conditioners and packaged air conditioners
• copper pipes used for heat transfer pipes or refrigerant pipes for refrigerators etc.
• Strengthening is required.
• it is important to define manufacturing conditions such as appropriate heat treatment conditions according to the alloy components in addition to being appropriate alloy components.
• the Cu—Ni—P-based copper alloy material described in Patent Document 1 has a strength (tensile strength) of over 300 MPa and has a high strength, but has a low elongation, and thus is strongly processed. Is not suitable.
• a copper alloy material such as a Cu—Ni—P-based plate material, bar material, and copper alloy tube having high strength and excellent workability.
• the present invention (1) comprises a copper alloy containing 0.4 to 3.5% by mass of Ni and 0.1 to 0.5% by mass of P, the balance being Cu and inevitable impurities.
• a copper alloy material (A) is provided.
• the present invention (2) comprises a copper alloy containing 0.4 to 3.5% by mass of Ni and 0.1 to 0.5% by mass of P, the balance being Cu and inevitable impurities.
• Copper alloy material The tensile strength ( ⁇ 2) is 270 to 370 MPa,
• the copper alloy material (B) characterized by the above is provided.
• this invention (3) is a copper alloy material obtained by performing the 1st heat processing which heats the copper alloy material (A) of (1) at 650 degreeC +/- 100 degreeC,
• the tensile strength ( ⁇ 2) is 270 to 370 MPa,
• the copper alloy material (B) characterized by the above is provided.
• the present invention (4) is a copper alloy material obtained by performing a second heat treatment in which the copper alloy material (B) of (3) is heated at 850 ° C. ⁇ 100 ° C.
• the tensile strength ( ⁇ 2) is 300 MPa or more and the elongation ( ⁇ ) is 30% or more,
• the copper alloy material (C) characterized by the above is provided.
• the difference ( ⁇ 2 ⁇ 1) between the tensile strength ( ⁇ 2) after the second heat treatment and the tensile strength ( ⁇ 1) before the second heat treatment is 20 MPa or more.
• the copper alloy material (C) is provided.
• the present invention (6) comprises a copper alloy containing 0.4 to 3.5% by mass of Ni and 0.1 to 0.5% by mass of P, the balance being Cu and inevitable impurities.
• a copper alloy tube (A) is provided.
• the present invention (7) comprises a copper alloy containing 0.4 to 3.5% by mass of Ni and 0.1 to 0.5% by mass of P, the balance being Cu and inevitable impurities.
• a copper alloy tube (B) is provided.
• the present invention (8) is a copper alloy tube obtained by performing a first heat treatment in which the copper alloy tube (A) of (6) is heated at 650 ° C. ⁇ 100 ° C.
• the tensile strength ( ⁇ 2) is 270 to 370 MPa and the elongation ( ⁇ ) is 30% or more,
• a copper alloy tube (B) is provided.
• the present invention (9) comprises a copper alloy containing 0.4 to 3.5% by mass of Ni and 0.1 to 0.5% by mass of P, the balance being Cu and inevitable impurities.
• a copper alloy tube (C) is provided.
• the present invention (10) is a copper alloy tube obtained by performing a second heat treatment in which the copper alloy tube (B) of (8) is heated at 850 ° C. ⁇ 100 ° C.
• the tensile strength ( ⁇ 2) is 300 MPa or more and the elongation ( ⁇ ) is 30% or more,
• a copper alloy tube (C) is provided.
• the difference ( ⁇ 2 ⁇ 1) between the tensile strength ( ⁇ 2) after the second heat treatment and the tensile strength ( ⁇ 1) before the second heat treatment is 20 MPa or more.
• the copper alloy pipe (C) is provided.
• the present invention (12) provides the copper alloy tube (C) according to claim (10) or (11), wherein the second heat treatment is brazing heating.
• a copper alloy material such as a Cu—Ni—P-based plate material, bar material, or copper alloy tube having high strength and excellent workability.
• the copper alloy material (A) of the present invention contains 0.4 to 3.5% by mass of Ni and 0.1 to 0.5% by mass of P, with the balance being Cu and inevitable impurities. Material.
• the copper alloy material (B) of the present invention is a copper alloy material obtained by performing a first heat treatment in which the copper alloy material (A) of the present invention is heated at 650 ° C. ⁇ 100 ° C.
• the copper alloy material (C) of the present invention is a copper alloy material obtained by performing a second heat treatment in which the copper alloy material (B) of the present invention is heated at 850 ° C. ⁇ 100 ° C. That is, the copper alloy material (C) of the present invention includes a first heat treatment for heating the copper alloy material (A) of the present invention at 650 ° C. ⁇ 100 ° C., and a first heat treatment after heating the first heat treatment at 850 ° C. ⁇ 100 ° C. It is a copper alloy material obtained by performing two heat treatments.
• the inventors have a copper alloy having a specific chemical composition, that is, 0.4 to 3.5 mass% Ni, preferably 0.7 to 1.5.
• a heat treatment to be performed after solution treatment of a copper alloy containing Ni of 0.1% by mass and P of 0.1 to 0.5% by mass, preferably 0.2 to 0.4% by mass of P By performing a first heat treatment heated at 650 ° C. ⁇ 100 ° C., Cu—Ni—P-based precipitates are precipitated in the copper alloy, thereby improving the strength of the copper alloy material by precipitation strengthening, It has been found that the strength of the copper alloy material is further improved by performing the second heat treatment performed at 850 ° C. ⁇ 100 ° C. after the first heat treatment.
• the copper alloy material (A), the copper alloy material (B), and the copper alloy material (C) contain 0.4 to 3.5% by mass of Ni and 0.1 to 0.5% by mass of P. And the balance Cu and inevitable impurities.
• the copper alloy material (A), the copper alloy material (B) and the copper alloy material (C) contain Ni and P, and in the copper alloy material (A), the copper alloy material (B) and the copper alloy material (C)
• the Ni content is 0.4 to 3.5% by mass
• the P content is 0.1 to 0.5% by mass.
• Ni and P are components for forming a precipitate with a compound of Ni and P in a copper alloy and improving the tensile strength.
• the copper alloy material of the present invention is a pipe material
• the Ni content of the copper alloy material (A) is 0.7 to 1.5% by mass in that the strength of the pipe material is high and the workability is excellent. It is preferable.
• the P content of the copper alloy material (A) is 0.2 to 0.4% by mass in that the strength of the pipe material is high and the workability is excellent. It is preferable.
• Ni content exceeds the above range, the elongation becomes low, and the workability, for example, the bending process of strength in the case of a plate material, the hairpin bending process in the case of a tube material and the tube expandability are reduced, If the P content exceeds the above range, the workability is lowered, and there is a possibility that cracking may occur in hot working or cold working. Moreover, when Ni content or P content is less than the said range, the intensity
• the copper alloy material (A) is manufactured by casting a copper alloy ingot having a predetermined chemical composition and then performing various processes and treatments.
• the copper alloy material (A) is first 0.4 to 3.5 mass% Ni, preferably 0.7 to 1.5 mass% Ni and 0.1 to 0.5 mass% P, preferably Contains 0.2 to 0.4 mass% of P, and casts a copper alloy ingot consisting of the balance Cu and inevitable impurities, and then to a copper alloy ingot adjusted to the above-mentioned predetermined chemical composition, It is obtained by performing a solution treatment, various processing (for example, hot processing such as hot rolling and hot extrusion, cold processing such as cold rolling and cold drawing) and various heat treatments.
• hot processing such as hot rolling and hot extrusion
• cold processing such as cold rolling and cold drawing
• the solution treatment is performed by appropriately selecting an appropriate time in the process of obtaining the copper alloy material by performing the above-described various processing and various heat treatments. For example, after hot working and before cold working or after cold working, a solution treatment is performed in which the copper alloy is heated to 850 to 1000 ° C. and then rapidly cooled. In the case where the cold working is performed a plurality of times, after the hot working and before all the cold workings, between the cold working and the cold working, or after all the cold workings, the copper alloy is 850-1000. After heating to ° C., solution treatment is performed to cool rapidly. Moreover, the solution treatment can be performed by rapidly cooling the hot-worked copper alloy after the hot working.
• the copper alloy material (B) can be obtained by performing a first heat treatment in which the copper alloy material (A) obtained as described above is heated at 650 ° C. ⁇ 100 ° C. After the copper alloy material (A) is heated at 650 ° C. ⁇ 100 ° C., it is cooled.
• the cooling rate is not particularly limited, but is preferably 2 to 10 ° C./min.
• the copper alloy material (C) can be obtained by performing a second heat treatment in which the copper alloy material (B) obtained as described above is heated at 850 ° C. ⁇ 100 ° C. After the copper alloy material (B) is heated at 850 ° C. ⁇ 100 ° C., it is cooled.
• the cooling rate is not particularly limited, but is preferably 2 to 10 ° C./second.
• a copper alloy material (A) is obtained by performing a solution treatment in which the copper alloy is rapidly cooled from 850 to 1000 ° C.
• a copper alloy material (B) is obtained by performing a first heat treatment heated at 650 ° C. ⁇ 100 ° C.
• a copper alloy is obtained by performing a second heat treatment heated at 850 ° C. ⁇ 100 ° C. after the first heat treatment.
• Material (C) is obtained.
• the tensile strength ( ⁇ 2) of the copper alloy material (B) is 270 to 370 MPa. Moreover, the tensile strength ( ⁇ 2) of the copper alloy material (C) is 300 MPa or more, and the elongation ( ⁇ ) is 30% or more.
• the difference ( ⁇ 2 ⁇ 1) in strength ( ⁇ 2) is preferably 20 MPa or more.
• the copper alloy material (C) has a high tensile strength ( ⁇ 2) of 300 MPa or more, it is suitably used as a copper alloy material for applications requiring high strength. That is, first, 0.4 to 3.5 mass% Ni, preferably 0.7 to 1.5 mass% Ni, and 0.1 to 0.5 mass% P, preferably 0.2 to 0 mass%. The casting process which casts the copper alloy which contains 4 mass% P, and consists of remainder Cu and an unavoidable impurity is performed. Next, the copper alloy ingot obtained by performing the casting process is heated and homogenized, and then the homogenized copper alloy is hot-extruded and then the hot-extruded copper alloy is cooled. To form into a desired copper alloy material shape.
• Examples of the hot working include hot rolling in the case of a plate material, and hot extrusion in the case of a tube material.
• examples of cold working include cold rolling in the case of a plate material, and cold rolling, cold drawing, and rolling to form an inner surface groove in the case of a pipe material. Then, by performing solution treatment, first heat treatment, and second heat treatment during or after these hot working to cold working, a high strength copper alloy material (C) and a predetermined A copper alloy material processed into a shape can be obtained.
• C copper alloy material
• the copper alloy material (B) has a tensile strength ( ⁇ 2) of 270 to 370 MPa
• the copper alloy material (C) has a high tensile strength ( ⁇ 2) of 300 MPa or more. Therefore, when the material obtained by processing the copper alloy material is a copper alloy material that has high strength and requires high strength processing, the copper alloy material (A) is subjected to the first heat treatment, and the workability is improved.
• the copper alloy materials (A), (B), and (C) are suitably used for various applications that require strong processing, that is, as copper alloy materials for strong processing and high strength.
• Examples of the forms of the copper alloy materials (A), (B), and (C) of the present invention include plate materials, bar materials, copper alloy tubes, and particularly seamless copper alloy tubes.
• a copper alloy material (A) in the form of a copper alloy tube is a copper alloy tube (A)
• a copper alloy material (B) in the form of a copper alloy tube is a copper alloy tube (B)
• a copper alloy tube is also referred to as a copper alloy tube (C).
• Copper alloy pipes (A), (B) and (C) are heat exchanger pipes or refrigerant pipes for air conditioner heat exchangers or refrigerators such as room air conditioners and packaged air conditioners, or copper alloy pipes for their production. And is preferably used.
• Copper alloy tubes (A), (B), and (C) include a bare tube having no groove on the inner surface and an inner grooved tube having a groove on the inner surface.
• the copper alloy tube (A) made of a copper alloy containing 2 to 0.4 mass% P and the balance Cu and unavoidable impurities is subjected to a first heat treatment to obtain a copper alloy tube (B Then, the copper alloy tube (B) is subjected to high-strength hairpin bending and tube expansion, and then the copper alloy tube (B) after processing is subjected to second heat treatment to increase the strength.
• a copper alloy tube (C) having a high strength can be obtained, a heat transfer tube or a refrigerant pipe having a high strength can be produced.
• Copper alloy tubes (A), (B) and (C) and their production examples are described below.
• the production examples of the copper alloy tubes (A), (B) and (C) of the present invention described below are examples for producing the copper alloy tubes of the present invention, and the copper alloy tubes of the present invention are It is not limited to what was manufactured by the method shown below.
• the copper alloy tube (A) comprises 0.4 to 3.5% by weight of Ni, preferably 0.7 to 1.5% by weight of Ni and 0.1 to 0.5% by weight of P, preferably 0
• hot extrusion is performed on the billet obtained through the casting process.
• the billet obtained by casting is heated at a temperature of 850 to 950 ° C.
• This heat treatment can also serve as a homogenization treatment for eliminating segregation during casting.
• Hot extrusion In the hot extrusion process, a billet heated to a temperature of 850 to 950 ° C. is hot extruded. Hot extrusion is performed by mandrel extrusion. That is, hot extrusion is performed with a mandrel inserted into a billet previously perforated cold before heating, or a billet perforated hot before extrusion. And after performing hot extrusion, it cools rapidly and obtains a hot extrusion element pipe.
• the hot extruded element tube obtained by hot working is cold worked.
• the hot extruded element tube obtained by hot working is subjected to cold processing such as cold rolling and cold drawing to reduce the outer diameter and wall thickness of the pipe, making it seamless.
• the seamless copper pipe after the cold working is the copper alloy pipe (A).
• the copper alloy tube (A) is an internally grooved tube in which an internally grooved groove is formed
• cold working is performed on a hot extruded element tube obtained by hot working.
• the hot extruded element tube obtained by hot working is subjected to cold processing such as cold rolling and cold drawing to reduce the outer diameter and wall thickness of the pipe, making it seamless. Get a tube.
• the seamless element tube obtained by the cold working is subjected to intermediate annealing in which heating is performed at 700 to 900 ° C., and after the cooling, the rolling work is performed.
• a rolled plug with a spiral groove formed on the outer surface is placed in a seamless pipe, and the inner surface of the pipe is pressed from the outside of the pipe with a plurality of rolling balls that rotate at high speed.
• the groove of the rolled plug is transcribed to form a groove on the inner surface of the tube to obtain a seamless copper tube.
• the seamless copper pipe after the rolling process is the copper alloy pipe (A).
• the copper alloy tube (A) After hot working and before cold working or after cold working, the copper alloy is heated to 850 to 1000 ° C. and then rapidly cooled. In the case where the cold working is performed a plurality of times, after the hot working and before all the cold workings, between the cold working and the cold working, or after all the cold workings, the copper alloy is 850-1000. After heating to ° C., solution treatment is performed to cool rapidly. Moreover, the solution treatment can be performed by rapidly cooling the hot-worked copper alloy after the hot working.
• a copper alloy tube (A) is obtained.
• the copper alloy tube (A) is subjected to a first heat treatment that is heated at 650 ° C. ⁇ 100 ° C. That is, the copper alloy tube (A) is a copper alloy tube before the first heat treatment is performed.
• the copper alloy tube (B) comprises 0.4 to 3.5 mass% Ni, preferably 0.7 to 1.5 mass% Ni and 0.1 to 0.5 mass% P, preferably 0 0.2 to 0.4 mass% of P, and a copper alloy tube made of a copper alloy consisting of the balance Cu and unavoidable impurities, a tensile strength ( ⁇ 2) of 270 to 370 MPa, and an elongation ( ⁇ ) Is a copper alloy tube of 30% or more.
• the copper alloy tube (B) can be obtained by performing a first heat treatment in which the copper alloy tube (A) is heated at 650 ° C. ⁇ 100 ° C.
• the heating time in the first heat treatment is not particularly limited, but is usually 10 minutes to 5 hours.
• the cooling rate is not particularly limited, but is preferably 2 to 10 ° C./min. Note that another heat treatment may be performed after the solution treatment and before the first heat treatment.
• the copper alloy tube (B) Since the copper alloy tube (B) has a tensile strength ( ⁇ 2) of 270 to 370 MPa and an elongation ( ⁇ ) of 30% or more, it has high workability and is called hairpin bending or tube expansion. Has excellent processability in high-strength processing.
• the copper alloy tube (B) thus obtained is subjected to a second heat treatment that is heated at 850 ° C. ⁇ 100 ° C. after being subjected to hairpin bending and tube expansion.
• the copper alloy tube (B) is subjected to the second heat treatment that is heated at 850 ° C. ⁇ 100 ° C. without being subjected to hairpin bending and tube expansion. That is, the copper alloy tube (B) is a copper alloy tube before the second heat treatment is performed.
• the copper alloy tube (C) comprises 0.4 to 3.5% by weight of Ni, preferably 0.7 to 1.5% by weight of Ni and 0.1 to 0.5% by weight of P, preferably 0 0.2 to 0.4% by mass of P, and a copper alloy tube made of a copper alloy composed of the balance Cu and inevitable impurities, the tensile strength ( ⁇ 2) is 300 MPa or more, and the elongation ( ⁇ ) is It is a copper alloy tube of 30% or more.
• the copper alloy tube (C) can be obtained by performing a second heat treatment in which the copper alloy tube (B) is heated at 850 ° C. ⁇ 100 ° C.
• the heating time in the second heat treatment is not particularly limited, but is usually 10 seconds to 1 hour.
• the cooling rate is not particularly limited, but is preferably 2 to 20 ° C./second. Focusing on the heat treatment, the copper alloy tube (C) is obtained by performing a first heat treatment for heating the copper alloy tube (A) at 650 ° C. ⁇ 100 ° C. and a second treatment for heating at 850 ° C. ⁇ 100 ° C.
• a copper alloy tube which is a copper alloy composed of the remainder Cu and unavoidable impurities, and hot-worked and cold-worked into a shape of a copper alloy tube, and solution treatment and
• the copper alloy tube subjected to the first heat treatment is assembled together with other members constituting the heat exchanger for the air conditioner or the refrigerator, and then heated at 850 ° C. ⁇ 100 ° C. to braze the copper alloy tube and the other members.
• a copper alloy tube (C) can also be obtained.
• the difference ( ⁇ 2 ⁇ 1) between the tensile strength ( ⁇ 2) after the second heat treatment and the tensile strength ( ⁇ 1) before the second heat treatment of the copper alloy tube is preferably 20 MPa or more. That is, the copper alloy tube before the second treatment is preferably a copper alloy tube whose strength is improved by 20 MPa or more by heating at 850 ° C. ⁇ 100 ° C.
• the copper alloy tube (C) has a high strength because the tensile strength ( ⁇ 2) is 300 MPa or more and the elongation ( ⁇ ) is 30% or more. Therefore, the copper alloy tube (C) is suitably used as a heat transfer tube or a copper alloy tube for refrigerant piping that requires high strength. Moreover, copper alloy pipe
• the heating temperature is within the temperature range of the first heat treatment (650 ° C.
• the copper alloy material after the second heat treatment has a tensile strength ( ⁇ 2) of 300 MPa or more and an elongation ( ⁇ ) of 30 % Of physical properties can be satisfied.
• the heating temperature is within the temperature range of the first heat treatment ( 650 ° C. ⁇ 100 ° C.) and the temperature range of the second heat treatment (850 ° C. ⁇ 100 ° C.), the copper alloy material after the second heat treatment has a tensile strength ( ⁇ 2) of 300 MPa or more. In addition, the physical properties of elongation ( ⁇ ) of 30% or more are not satisfied.
• Examples 1 to 10 and Comparative Examples 1 to 7 Using a high-frequency melting furnace, casting was performed with the chemical composition shown in Table 1 in a mold size: width 50 mm ⁇ length 100 mm ⁇ height 200 mm. Next, the ingot was chamfered and heated at 900 ° C. for 2 hours, and then immediately put into a water bath and cooled. Subsequently, the steel sheet was rolled to a thickness of 1.0 mm by cold rolling, then subjected to intermediate annealing at 900 ° C. for 10 seconds, and then rolled to a thickness of 0.7 mm by cold rolling. Next, a first heat treatment and a second heat treatment were performed under the conditions shown in Table 1 to obtain a copper alloy material.
• test piece having a length of 100 mm and a parallel part width of 10 mm was prepared from the obtained copper alloy material, and tensile strength and elongation were measured. Further, the tensile strength was measured in the same manner for the copper alloy material before the second heat treatment.
• ⁇ Tensile strength ( ⁇ ), elongation ( ⁇ )> The tensile strength ( ⁇ ) and elongation ( ⁇ ) of the copper alloy were measured according to JIS Z2241.
• ⁇ 1 is the tensile strength before the second heat treatment
• ⁇ 2 is the tensile strength after the second heat treatment
• Examples 11 to 12 and Comparative Examples 8 to 9 An ingot having a diameter of 100 mm was produced in a high-frequency melting furnace with the chemical composition shown in Table 2, and then stripped to 90 mm to obtain a billet. Next, the billet was heated to 900 ° C. and subjected to hot extrusion to obtain a hot extruded element tube of ⁇ 20 mm ⁇ thickness 1.5 mm. Then, it was heated in a furnace at 900 ° C. and immediately put into a water bath to be cooled. Subsequently, drawing was performed in a cold state to ⁇ 10 mm ⁇ thickness 0.5 mm. Next, the first heat treatment was performed by heating at 650 ° C. for 1 hour, and then the second heat treatment was performed by heating at 850 ° C. for 30 seconds to obtain a copper tube.
• ⁇ 1 is the tensile strength before the second heat treatment
• ⁇ 2 is the tensile strength after the second heat treatment
• ⁇ 1 is the elongation before the second heat treatment
• ⁇ 2 is the elongation after the second heat treatment.

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• 2015
  • 2015-02-12 JP JP2015562836A patent/JP6541583B2/ja active Active
  • 2015-02-12 CN CN201580008568.0A patent/CN105992832B/zh active Active
  • 2015-02-12 KR KR1020167024942A patent/KR20160120315A/ko not_active Application Discontinuation
  • 2015-02-12 WO PCT/JP2015/053738 patent/WO2015122423A1/ja active Application Filing

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