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US 8,986,471 B2Granted
High strength and high thermal conductivity copper alloy tube and method for producing the same
AssigneeMitsubishi Shindoh Co., Ltd.
InventorKeiichiro Oishi
Life of this patent
Estimating the term…
Abstract
A high strength and high thermal conductivity copper alloy tube contains: Co of 0.12 to 0.32 mass %; P of 0.042 to 0.095 mass %; and Sn of 0.005 to 0.30 mass %, wherein a relationship of 3.0≦([Co]−0.007)/([P]−0.008)≦6.2 is satisfied between a content [Co] mass % of Co and a content [P] mass % of P, and the remainder includes Cu and inevitable impurities. Even when a temperature is increased by heat generated by a drawing process, a recrystallization temperature is increased by uniform precipitation of a compound of Co and P and by solid-solution of Sn. Thus, the generation of recrystallization nucleuses is delayed, thereby improving heat resistance and pressure resistance of the high strength and high thermal conductivity copper alloy tube.
Claims22
A high strength and high thermal conductivity copper alloy tube subjected to a drawing process, wherein the copper alloy tube has an alloy composition comprising:
- Co of 0.12 to 0.32 mass %;
- P of 0.042 to 0.095 mass %;
- Sn of 0.005 to 0.30 mass %;
- and
- at least one of Ni of 0.01 to 0.15 mass % and Fe of 0.005 to 0.07 mass %,
- wherein relationships of 3.0≦([Co]+0.85×[Ni]+0.75×[Fe]−0.007)/([P]−0.008)≦6.2 and 0.015≦1.5×[Ni]+3×[Fe]≦[Co] are satisfied, wherein [Co] is the content in mass % of Co, [Ni] is the content in mass % of Ni, [Fe] is the content in mass % of Fe, and [P] is the content in mass % of P, and the remainder includes Cu and inevitable impurities,
- wherein a recrystallization ratio of a metal structure of a drawing-processed portion of the copper alloy tube subjected to the drawing process is 50% or less, or a recrystallization ratio of a heat-influenced portion subject to the drawing process is 20% or less.
4 more elements
A high strength and high thermal conductivity copper alloy tube subjected to a drawing process, wherein the copper alloy tube has an alloy composition comprising:
- Co of 0.12 to 0.32 mass %;
- P of 0.042 to 0.095 mass %;
- Sn of 0.005 to 0.30 mass %;
- and
- at least one of Ni of 0.01 to 0.15 mass % and Fe of 0.005 to 0.07 mass %,
- wherein relationships of 3.0≦([Co]+0.85×[Ni]+0.75×[Fe]−0.007)/([P]−0.008)≦6.2 and 0.015≦1.5×[Ni]+3×[Fe]≦[Co] are satisfied, wherein [Co] is the content in mass % of Co, [Ni] is the content in mass % of Ni, [Fe] is the content in mass % of Fe, and [P] is the content in mass % of P, and the remainder includes Cu and inevitable impurities,
- wherein a recrystallization ratio of a metal structure of a drawing-processed portion of the copper alloy tube subjected to the drawing process is 50% or less, or a recrystallization ratio of a heat-influenced portion subject to the drawing process is 20% or less, and
- wherein in a metal structure of a process end portion and a process center portion before the drawing process, after the drawing process, or after brazing with another copper tube, circular or oval fine precipitates having a size of 2 to 20 nm containing Co and P are uniformly dispersed, or 90% or more of all precipitates are uniformly dispersed as fine precipitates having a size of 30 nm or less.
5 more elements
A high strength and high thermal conductivity copper alloy tube subjected to a drawing process, wherein the copper alloy tube has an alloy composition comprising:
- Co of 0.12 to 0.32 mass %;
- P of 0.042 to 0.095 mass %;
- Sn of 0.005 to 0.30 mass %;
- at least one of Ni of 0.01 to 0.15 mass % and Fe of 0.005 to 0.07 mass %;
- and
- at least one of Zn of 0.001 to 0.5 mass %, Mg of 0.001 to 0.2 mass %, and Zr of 0.001 to 0.1 mass %,
- wherein relationships of 3.0≦([Co]+0.85×[Ni]+0.75×[Fe]−0.007)/([P]−0.008)≦6.2 and 0.015≦1.5×[Ni]+3×[Fe]≦[Co] are satisfied, wherein [Co] is the content in mass % of Co, [Ni] is the content in mass % of Ni, [Fe] is the content in mass % of Fe, and [P] is the content in mass % of P, and the remainder includes Cu and inevitable impurities,
- wherein a recrystallization ratio of a metal structure of a drawing-processed portion of the copper alloy tube subjected to the drawing process is 50% or less, or a recrystallization ratio of a heat-influenced portion subject to the drawing process is 20% or less, and
- wherein in a metal structure of a process end portion and a process center portion before the drawing process, after the drawing process, or after brazing with another copper tube, circular or oval fine precipitates having a size of 2 to 20 nm containing Co and P are uniformly dispersed, or 90% or more of all precipitates are uniformly dispersed as fine precipitates having a size of 30 nm or less.
6 more elements
A high strength and high thermal conductivity copper alloy tube subjected to a drawing process, wherein the copper alloy tube has an alloy composition comprising:
- Co of 0.12 to 0.32 mass %;
- P of 0.042 to 0.095 mass %;
- Sn of 0.005 to 0.30 mass %;
- and
- at least one of Ni of 0.01 to 0.15 mass % and Fe of 0.005 to 0.07 mass %,
- wherein relationships of 3.0≦([Co]+0.85×[Ni]+0.75×[Fe]−0.007)/([P]—0.008)≦6.2 and 0.015≦1.5×[Ni]+3×[Fe]≦[Co] are satisfied, wherein [Co] is the content in mass % of Co, [Ni] is the content in mass % of Ni, [Fe] is the content in mass % of Fe, and [P] is the content in mass % of P, and the remainder includes Cu and inevitable impurities,
- wherein a recrystallization ratio of a metal structure of a drawing-processed portion of the copper alloy tube subjected to the drawing process is 50% or less, and a recrystallization ratio of a heat-influenced portion subject to the drawing process is 0%, and
- wherein in a metal structure of a process end portion and a process center portion before the drawing process, after the drawing process, or after brazing with another copper tube, circular or oval fine precipitates having a size of 2 to 20 nm containing Co, P, and either one of Ni or Fe are uniformly dispersed, or 90% or more of all precipitates are uniformly dispersed as fine precipitates having a size of 30 nm or less.
5 more elements
A high strength and high thermal conductivity copper alloy tube subjected to a drawing process, wherein the copper alloy tube has an alloy composition comprising:
- Co of 0.12 to 0.32 mass %;
- P of 0.042 to 0.095 mass %;
- Sn of 0.005 to 0.30 mass %;
- at least one of Ni of 0.01 to 0.15 mass % and Fe of 0.005 to 0.07 mass %;
- and
- at least one of Zn of 0.001 to 0.5 mass %, Mg of 0.001 to 0.2 mass %, and Zr of 0.001 to 0.1 mass %,
- wherein relationships of 3.0≦([Co]+0.85×[Ni]+0.75×[Fe]−0.007)/([P]−0.008)≦6.2 and 0.015≦1.5×[Ni]+3×[Fe]≦[Co] are satisfied, wherein [Co] is the content in mass % of Co, [Ni] is the content in mass % of Ni, [Fe] is the content in mass % of Fe, and [P] is the content in mass % of P, and the remainder includes Cu and inevitable impurities,
- wherein a recrystallization ratio of a metal structure of a drawing-processed portion of the copper alloy tube subjected to the drawing process is 50% or less, and a recrystallization ratio of a heat-influenced portion subject to the drawing process is 0%, and
- wherein in a metal structure of a process end portion and a process center portion before the drawing process, after the drawing process, or after brazing with another copper tube, circular or oval fine precipitates having a size of 2 to 20 nm containing Co, P, and either one of Ni or Fe are uniformly dispersed, or 90% or more of all precipitates are uniformly dispersed as fine precipitates having a size of 30 nm or less.
6 more elements
A high strength and high thermal conductivity copper alloy tube subjected to a drawing process, wherein the copper alloy tube has an alloy composition comprising:
- Co of 0.12 to 0.32 mass %;
- P of 0.042 to 0.095 mass %;
- Sn of 0.005 to 0.30 mass %;
- and
- at least one of Ni of 0.01 to 0.15 mass % and Fe of 0.005 to 0.07 mass %,
- wherein relationships of 3.0≦([Co]+0.85×[Ni]+0.75×[Fe]−0.007)/([P]−0.008)≦6.2 and 0.015≦1.5×[Ni]+3×[Fe]≦[Co] are satisfied, wherein [Co] is the content in mass % of Co, [Ni] is the content in mass % of Ni, [Fe] is the content in mass % of Fe, and [P] is the content in mass % of P, and the remainder includes Cu and inevitable impurities,
- wherein conductivity of the copper tube before the drawing process is 60% IACS or less,
- wherein a recrystallization ratio of a metal structure of a drawing-processed portion of the copper alloy tube subjected to the drawing process is 50% or less, or a recrystallization ratio of a heat-influenced portion subject to the drawing process is 20% or less, and
- wherein in a metal structure of a process end portion and a process center portion before the drawing process, after the drawing process, or after brazing with another copper tube, circular or oval fine precipitates having a size of 2 to 20 nm containing Co and P are uniformly dispersed, or 90% or more of all precipitates are uniformly dispersed as fine precipitates having a size of 30 nm or less.
6 more elements
A high strength and high thermal conductivity copper alloy tube subjected to a drawing process, wherein the copper alloy tube has an alloy composition comprising:
- Co of 0.12 to 0.32 mass %;
- P of 0.042 to 0.095 mass %;
- Sn of 0.005 to 0.30 mass %;
- at least one of Ni of 0.01 to 0.15 mass % and Fe of 0.005 to 0.07 mass %;
- and
- at least one of Zn of 0.001 to 0.5 mass %, Mg of 0.001 to 0.2 mass %, and Zr of 0.001 to 0.1 mass %,
- wherein relationships of 3.0≦([Co]+0.85×[Ni]+0.75×[Fe]−0.007)/([P]−0.008)≦6.2 and 0.015≦1.5×[Ni]+3×[Fe]≦[Co] are satisfied, wherein [Co] is the content in mass % of Co, [Ni] is the content in mass % of Ni, [Fe] is the content in mass % of Fe, and [P] is the content in mass % of P, and the remainder includes Cu and inevitable impurities,
- wherein conductivity of the copper tube before the drawing process is 60% IACS or less,
- wherein a recrystallization ratio of a metal structure of a drawing-processed portion of the copper alloy tube subjected to the drawing process is 50% or less, or a recrystallization ratio of a heat-influenced portion subject to the drawing process is 20% or less, and
- wherein in a metal structure of a process end portion and a process center portion before the drawing process, after the drawing process, or after brazing with another copper tube, circular or oval fine precipitates having a size of 2 to 20 nm containing Co and P are uniformly dispersed, or 90% or more of all precipitates are uniformly dispersed as fine precipitates having a size of 30 nm or less.
7 more elements
Dependencies are inferred from the claim text.