WO2018061277A1 - 高耐食性銅管 - Google Patents

高耐食性銅管 Download PDF

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Publication number
WO2018061277A1
WO2018061277A1 PCT/JP2017/016194 JP2017016194W WO2018061277A1 WO 2018061277 A1 WO2018061277 A1 WO 2018061277A1 JP 2017016194 W JP2017016194 W JP 2017016194W WO 2018061277 A1 WO2018061277 A1 WO 2018061277A1
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WIPO (PCT)
Prior art keywords
tube
corrosion
weight
copper tube
copper
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PCT/JP2017/016194
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English (en)
French (fr)
Japanese (ja)
Inventor
博一 玉川
謙輔 水藤
日浦　智之
Original Assignee
株式会社Uacj
株式会社Ｕａｃｊ銅管
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.)
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Application filed by 株式会社Uacj, 株式会社Ｕａｃｊ銅管 filed Critical 株式会社Uacj
Priority to JP2017555813A priority Critical patent/JP6271826B1/ja
Priority to KR1020187008974A priority patent/KR101911214B1/ko
Priority to EP17855236.0A priority patent/EP3521463B1/en
Publication of WO2018061277A1 publication Critical patent/WO2018061277A1/ja
Priority to US16/005,259 priority patent/US20180291491A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/005—Continuous extrusion starting from solid state material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, bars, tubes
    • B21C23/085—Making tubes
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys

Definitions

  • the present invention relates to a high corrosion resistance copper pipe, and more particularly to a copper pipe suitably used for heat transfer pipes, refrigerant pipes and the like in air conditioning equipment and refrigeration equipment, and relates to a technique for improving corrosion resistance against ant nest corrosion. .
  • phosphorous-deoxidized copper pipes which are pipe materials used in such air conditioning equipment and refrigeration equipment, have an abnormal corrosion that progresses in the form of ant nests from the pipe surface in the tube thickness direction, so-called ant nest-like corrosion.
  • This nest-like corrosion is said to occur in a moist environment using a lower carboxylic acid such as formic acid or acetic acid as a corrosive medium, and is also a chlorinated organic solvent such as 1,1,1-trichloroethane, or some lubricating oil.
  • formaldehyde and the like similar corrosion has been confirmed.
  • Patent Document 1 contains P (phosphorus) in a proportion of 0.05 to 1.0% by weight, with the balance being Cu (copper) and inevitable impurities.
  • a high corrosion resistance copper tube characterized by being made of a certain Cu material has been proposed, and it has been clarified that corrosion resistance against ant nest corrosion is obtained. That is, there is obtained a practically advantageous copper tube that can further improve the corrosion resistance against ant nest-like corrosion in a region where the P content is larger than that of a conventional tube material made of phosphorous deoxidized copper. The fact that can be done is pointed out.
  • the present invention has been made in the background of such circumstances, and the problem to be solved is an air conditioner or refrigeration that can exhibit even higher corrosion resistance against ant nest-like corrosion.
  • An object of the present invention is to provide a copper tube excellent in corrosion resistance and an advantageous manufacturing method thereof that can be suitably used as a heat transfer tube, a refrigerant pipe or the like in an apparatus, and an apparatus configured using such a copper pipe It is also possible to advantageously improve the service life.
  • the present inventors have determined a predetermined amount.
  • the fact that the corrosion resistance of the copper pipe can be further improved by controlling the conductivity value after plastic working for pipe making has been found and completed the present invention. It is.
  • P is contained at a ratio of 0.15 to 0.6% by weight, and the remainder is made of a Cu material made of Cu and impurities, and is not subjected to final annealing.
  • a copper tube having a processed structure is used and the P content is X (% by weight)
  • the following formula (2) 47-75X ⁇ Y2 ⁇ 57-75X
  • a high corrosion resistance copper tube characterized by having a conductivity (Y2:% IACS) that satisfies the above is also included.
  • the content of the specific impurity element group consisting of (zirconium) and Mo (molybdenum) is controlled to be 0.01% by weight or less in total.
  • the content of inevitable impurity elements other than the specific impurity element group in the impurities is 0.005 by weight in total. % To be controlled.
  • the high corrosion resistance copper pipe according to the present invention is preferably placed in a humid environment and exposed to a corrosive action that progresses in the form of a ant nest from the pipe surface in the thickness direction of the pipe by a corrosion medium comprising a lower carboxylic acid.
  • a corrosion medium comprising a lower carboxylic acid.
  • the final annealing treatment is performed at a temperature of 300 ° C. to 600 ° C.
  • a step of preparing a Cu ingot containing P in a proportion of 0.15 to 0.6% by weight and the balance being Cu and impurities A heat treatment step at a temperature of 950 ° C., an extruding step of hot-extruding the heat-treated Cu ingot at a temperature of 750 ° C. to 950 ° C.
  • the heat treatment of the Cu ingot is a homogenization treatment.
  • the heat treatment of the Cu ingot is a preliminary heat treatment of the Cu ingot adopted prior to the extrusion step. is there.
  • coolant piping in-machine piping
  • coolant piping in-machine piping
  • coolant piping in-machine piping
  • the air-conditioning equipment and refrigeration equipment which consist of high corrosion-resistant copper pipes which are excellent in the above-mentioned ant nest-like corrosiveness, and the gist To do.
  • copper pipes used in air conditioning equipment and refrigeration equipment and placed in a moist environment are generated in the moist environment using a lower carboxylic acid as a corrosion medium, which is induced from the surface of the copper pipe.
  • a lower carboxylic acid as a corrosion medium, which is induced from the surface of the copper pipe.
  • P was contained at a ratio of 0.15 to 0.6% by weight, and the remainder was formed from a Cu material composed of Cu and impurities.
  • the subject matter of the present invention is also a method for improving corrosion resistance, characterized by using a material having a conductivity (Y1:% IACS) that satisfies the above.
  • copper pipes used in air-conditioning equipment and refrigeration equipment and placed in a humid environment are generated in the wet environment using a lower carboxylic acid as a corrosion medium, which is induced from the surface.
  • P is contained in a proportion of 0.15 to 0.6% by weight as the copper tube, and the remainder is formed from a Cu material composed of Cu and impurities.
  • the subject matter of the present invention is also a method for improving corrosion resistance, characterized by using a material having a conductivity (Y2:% IACS) that satisfies the above.
  • the conductivity of a copper tube made of a Cu material containing a predetermined amount of P and having a recrystallized structure or a processed structure satisfies the above-described formula (1) or formula (2).
  • a copper tube in which the concentration of P dissolved in the Cu matrix is within the optimum range of 0.15 to 0.50% by weight can be obtained. Even if corrosion occurs in an environment where nest-like corrosion is likely to occur, it can be effectively changed not to a form of ant nest-like corrosion, but to a form of full-scale corrosion or pitting-like corrosion. Corrosion resistance against rust-like corrosion can be further improved. Therefore, in terms of corrosion resistance against ant nest-like corrosion, there is a practical copper tube that can exhibit further better corrosion resistance than conventionally known copper tubes. Can be advantageously provided.
  • a copper tube having the above-described characteristics can be manufactured industrially advantageously and easily.
  • the P content is a ratio within the range of 0.15 to 0.6% by weight, and the remainder is a Cu material composed of Cu and impurities (molten metal, ingot, etc.)
  • the material structure is a recrystallized structure after the final annealing after the cold working
  • the above formula While it is configured to have an electrical conductivity (Y1) that satisfies 1), if the processed structure is not subjected to such final annealing, the above formula (2) is satisfied. Therefore, even in a severer corrosive environment, the corrosion form of the copper pipe is in a direction perpendicular to the pipe axis (pipe wall thickness).
  • the ant's nest-like selective corrosion form that progresses in the penetration direction)
  • the surface corrosion progresses in a specific direction (the direction in which it spreads on the tube surface), and the occurrence of such ant nest corrosion is effectively suppressed or prevented, so that it is significantly more than conventional copper tubes. Corrosion resistance can be exhibited.
  • the P content is set to 0.15% by weight or more because corrosion forms are easily induced.
  • the upper limit of the P content needs to be limited to 0.6% by weight so that the optimum value of the P solid solution amount with respect to Cu described later can be obtained.
  • the high corrosion resistance copper pipe according to the present invention is composed of a material composed of Cu and impurities in addition to the P content as described above.
  • the content of the specific impurity element group consisting of Cr, Mn, Fe, Co, Zr and Mo is regulated to be 0.01% by weight or less in total, and thereby the corrosion resistance of the copper pipe Will be further improved. This is because these specific impurity element groups easily form a compound with P by a heat treatment such as annealing, and the resulting P-based precipitates lower the corrosion resistance of the copper tube.
  • impurities to be contained together with Cu in the copper tube material include S, Si, Ti, Ag, Pb, Se, Te, Bi, Sn, Sb, As, etc. These elements are also present as inevitable impurities, but it is generally desirable to adjust such inevitable impurities so that the total amount is 0.005% by weight or less.
  • the conductivity related to the P solid solution amount is determined by the copper pipe.
  • exceptional corrosion resistance can be exerted against ant nest corrosion. That is, in the pipe making process, a Cu base pipe is formed by hot extrusion of a Cu material, and then plastic processing (cold processing) is performed including processing such as rolling and drawing, and grooving such as inner surface grooving. After that, the electrical conductivity (Y1:% IACS) when annealing (final) is performed so that the material structure becomes a recrystallized structure is configured to satisfy the formula (1).
  • the conductivity (Y2:% IACS) of the copper tube is configured to satisfy the above formula (2).
  • the electrical conductivity By adjusting the electrical conductivity, the solid solubility of P necessary for ant-like corrosion can be secured, and thus high corrosion resistance can be stably obtained.
  • the copper tube having a processed structure is lightly processed from the recrystallized structure by annealing, and while the surface layer portion is the processed structure, the inside remains the recrystallized structure. A structure in which a recrystallization structure is mixed is also included.
  • the copper tube material structure is a recrystallized structure or a structure having a processed structure depending on whether or not the copper tube made of the Cu material as described above is finally annealed.
  • the conductivity (Y1 or Y2) so as to satisfy the above formula (1) or (2), the corrosion form of the copper pipe can be changed from the pipe surface even under severe corrosive environment. Transition from a selective corrosion mode that progresses in the vertical direction of the tube axis (through the pipe thickness) to a surface corrosion mode that progresses in the horizontal direction of the tube axis (the direction that spreads on the tube surface), significantly more corrosion resistance than conventional copper tubes Can be demonstrated.
  • the electrical conductivity (Y1) is lower than (50-75X) or has a processed structure when the copper tube is finally annealed to have a recrystallized structure.
  • the conductivity (Y2) is lower than (47-75X)
  • the resulting corrosion form shifts from the surface corrosion form to the selective corrosion form, that is, the ant nest-like form, and the corrosion resistance is improved. It begins to decline.
  • the concentration of P dissolved in the Cu matrix is within the range of 0.15 to 0.50% by weight which is the optimum value. Therefore, even if corrosion occurs in an environment where ant nest corrosion is likely to occur, it will not be in the form of ant nest corrosion, but in the form of full surface corrosion or pitting corrosion. As a result, the corrosion resistance against such ant nest corrosion can be further improved.
  • the solid solution P concentration in the Cu matrix is defined by the conductivity, and thereby, excellent ant nest corrosion resistance can be exhibited.
  • the electrical conductivity (% IACS) can be easily measured by an eddy current conductivity meter, and such a conductivity meter is easy to carry and stably has a solid solution P concentration. It has the characteristics that can be measured.
  • a method for calculating the solid solution amount of the additive element in the metal generally, a method of subtracting the additive element amount in the amount of the compound containing the additive element from the component value of the additive element is employed.
  • an ingot such as an ingot or billet made of a Cu material having the above-described P content (concentration) is usually used for casting and homogenizing treatment.
  • the target copper tube is manufactured through the same conventional processes such as hot extrusion of the tube, rolling, drawing of the tube, grooving, etc., but at that time, it is annealed and recrystallized. So that the electrical conductivity (Y1) of the copper tube formed and the electrical conductivity (Y2) of the copper tube having a processed structure without being finally annealed satisfy the above formulas (1) and (2).
  • the preheating in the hot extrusion process which is plastic working, is combined with the homogenization treatment, and the heating conditions are maintained at a temperature of 750 to 950 ° C. for 30 minutes or more, and the subsequent hot extrusion temperature is 750.
  • the method of hot extrusion at a temperature of ⁇ 950 ° C is preferably adopted. It is. However, in the case of carrying out the homogenization treatment, the conditions of heating for 30 minutes or more at a temperature of 750 ° C. to 950 ° C. are adopted, whereby the P segregation structure is advantageously removed, and further the subsequent heat By performing the inter-extrusion at a temperature of 750 ° C.
  • the ingot structure can be effectively destroyed, and the added P can be uniformly dissolved in the material structure.
  • the upper limit of the holding time under the above heating temperature is generally set to 12 hours from the economical viewpoint. Further, when a temperature higher than 950 ° C. is adopted as the above heating temperature, the material during hot working may be cracked, causing problems such as difficulty in safe working. Become so.
  • a Cu molten metal adjusted to have a P content as described above by adopting a technique such as a cast-and-roll method or an up-cast method, which has been proposed in recent years, is used.
  • the conditions such as the stirring and cooling rate of the components at the time of casting are appropriately controlled, and subsequent drawing or annealing is appropriately adopted.
  • a copper tube having a target size is obtained as it is or is subjected to a predetermined final annealing, which is used for the target application, by a drawing process that is a cold process.
  • the copper tube obtained by such drawing processing is further subjected to cold processing such as grooving processing such as inner surface grooving processing and outer surface grooving processing as necessary.
  • the copper tube having the size (structure) is used as it is or after being subjected to predetermined final annealing.
  • the final annealing as described above for the copper pipe is for changing the material structure from a processed structure to a recrystallized structure to improve workability such as bending, and is generally about 300 ° C. to 600 ° C.
  • the annealing is carried out at an annealing temperature, and the annealing time is appropriately selected within a range of about 5 minutes to 120 minutes.
  • the annealing temperature is lower than 300 ° C., the annealing effect is not sufficiently exhibited.
  • the annealing temperature exceeds 600 ° C., the corrosion resistance may be adversely affected.
  • the annealing time is less than 5 minutes, the effect of annealing is hardly obtained.
  • the effect of annealing is saturated, resulting in poor economic efficiency.
  • the outer diameter, the thickness (tube wall thickness) and the like can be appropriately selected according to the use of the copper tube.
  • a flat inner surface or outer surface which is a surface form formed by tube extrusion is adopted, as well known. It is also effective to use various types of known inner surface processing and outer surface processing to provide heat transfer tubes provided with various forms of inner surface grooves and outer surface grooves.
  • the inner surface and outer surface of the copper pipe are generally configured as a flat surface.
  • the copper pipe according to the present invention is obtained by pipe-making from a Cu material having a P content of 0.15 to 0.6% by weight, and the presence or absence of final annealing (form of the material structure) )
  • a conductivity (Y1 or Y2) that satisfies the above-mentioned formula (1), it has a high degree of corrosion resistance against ant nest-like corrosion. It will be an advantage.
  • the present invention is arranged in a humid environment and proceeds in a ant nest shape from the surface of the tube in the thickness direction of the tube by a corrosive medium composed of a lower carboxylic acid. It is advantageously used as a pipe material that is exposed to a corrosive action.
  • the copper pipe according to the present invention as described above can be suitably used as a heat transfer pipe, a refrigerant pipe or the like in an air conditioner, and similarly, also suitably used as a heat transfer pipe or a refrigerant pipe (in-machine pipe) in a refrigeration equipment. It can be done.
  • the various rolling blanks obtained above were each subjected to a drawing operation a plurality of times in the cold to obtain an outer diameter of 7.8 to 10.0 mm and a wall thickness of 0.25 to 0.
  • a 30 mm drawn element tube was obtained.
  • the workability of the entire cold drawing was 95.1 to 97.0% in terms of the cross-sectional reduction rate.
  • the total workability in cold rolling and cold drawing, that is, the total workability in cold working was 98.9 to 99.3% in terms of the cross-section reduction rate.
  • intermediate annealing was performed once or a plurality of times. And after the final drawing process, the intermediate annealing was performed and the original pipe
  • test copper tubes No. 1 to 31 having a shape were obtained as seamless tubes for heat transfer tubes of a cross fin tube type heat exchanger.
  • the inner grooved tubes have an outer diameter of 7.0 mm, a bottom wall thickness (t) of 0.23 mm, a fin height (h) of 0.22 mm, a fin apex angle ( ⁇ ) of 13 °, respectively.
  • the number of grooves was 44, and the lead angle ( ⁇ ) was 28 °.
  • the test copper tube No. 1,3,5,7,9,11,13,16,18,20,22,24,26,28,30 are wound by a cylindrical alignment multilayer winding, and the inner circumference side thereof A level-wound coil (LWC) of a method that is unwound from is manufactured, and then the final annealing is performed on the level-wound coil using a roller hearth continuous annealing furnace at a holding temperature of 500 ° C. and a holding time of 20 minutes. Went.
  • LWC level-wound coil
  • test copper tube In the production of the above inner grooved tube (test copper tube), the test copper tube No. In the case of 15, since a Cu material with a high P content is used, defects such as cracks occur in the pipe making process, and it cannot be processed to the end and can be subjected to a corrosion test. I could't get a copper tube.
  • test copper tube No. The impurity content of 1 to 14 is obtained by dissolving the test copper tube in an acid (aqua regia) and determining the content of the element contained as the impurity by high frequency inductively coupled plasma emission spectroscopy (ICP-OES). Analyzed by As a result, the total content of the specific impurity element group (Cr, Mn, Fe, Co, Zr and Mo) in any copper pipe is less than 0.010% by weight, and other than such specific impurity element group Even in the case of unavoidable impurities (S, Si, Ti, Ag, Pb, Se, Te, Bi, Sn, Sb, As), it was confirmed that the total content was less than 0.005% by weight.
  • ICP-OES inductively coupled plasma emission spectroscopy
  • the inner grooved tube (test copper tube) obtained as described above was subjected to final annealing and the one not subjected to such final annealing, respectively.
  • the conductivity was measured, and the results are shown in Table 2 below.
  • test copper tubes No. 1 to 31 were prepared various internally grooved tubes (test copper tubes No. 1 to 31) using the test apparatus shown in FIG.
  • reference numeral 2 denotes a 2 L plastic container that can be sealed with the cap 4, and the test copper tube 10 passes through the silicon stopper 6 attached through the cap 4. While being inserted into the poly container 2 to a predetermined depth, the lower end opening of the test copper tube 10 is closed with a silicon plug 8.
  • the test copper tube 10 has a length of 18 cm, and the length of the portion exposed in the poly container 2 is 15 cm.
  • 100 ml of a predetermined concentration of formic acid aqueous solution is accommodated in the poly container 2 in a form that does not contact the test copper tube 10.
  • the concentration of the formic acid aqueous solution 12 is set to 0.1%, and a predetermined test copper tube 10 is set in the plastic container 2 in which the formic acid aqueous solution 12 is accommodated.
  • a predetermined test copper tube 10 is set in the plastic container 2 in which the formic acid aqueous solution 12 is accommodated.
  • test copper tube No. 11 and 12 although the conductivity value satisfies the above formula (1) or (2), the P content is less than 0.15% by weight. Admitted that has occurred.
  • test copper tube No. 13, 14, and 16 to 31 although the P content is within the scope of the present invention, the conductivity value is outside the specified range of the present invention. Corrosion occurred, especially the test copper tube No. In Nos. 16 to 31, it was recognized that corrosion occurred through the pipe wall.
  • the test copper tube No. In the case of 15, the Cu material (billet) having a high P content is used, so that an effective copper tube that cannot be processed to the end in the pipe making process and can be used for a corrosion test is obtained. The target corrosion test could not be carried out.

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PCT/JP2017/016194 2016-09-29 2017-04-24 高耐食性銅管 WO2018061277A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2017555813A JP6271826B1 (ja) 2016-09-29 2017-04-24 高耐食性銅管
KR1020187008974A KR101911214B1 (ko) 2016-09-29 2017-04-24 고내식성 구리관
EP17855236.0A EP3521463B1 (en) 2016-09-29 2017-04-24 Highly corrosion-resistant copper pipe, method of manufacturing therefor and use thereof
US16/005,259 US20180291491A1 (en) 2016-09-29 2018-06-11 Highly corrosion-resistant copper tube

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Application Number Priority Date Filing Date Title
JP2016191076 2016-09-29
JP2016-191076 2016-09-29

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US16/005,259 Continuation US20180291491A1 (en) 2016-09-29 2018-06-11 Highly corrosion-resistant copper tube

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3495519A4 (en) * 2016-08-04 2019-12-25 UACJ Corporation HIGHLY CORROSION RESISTANT COPPER PIPE

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110229973B (zh) * 2019-06-20 2020-12-01 秦皇岛瀚丰长白结晶器有限责任公司 H型铬锆铜结晶器铜管生产工艺

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001247923A (ja) * 2000-03-07 2001-09-14 Sanbo Copper Alloy Co Ltd 耐孔食性銅基合金管材
JP2008304170A (ja) * 2007-06-11 2008-12-18 Kobe Steel Ltd 耐スケール付着性熱交換器用伝熱管
JP2009235428A (ja) * 2008-03-25 2009-10-15 Kobelco & Materials Copper Tube Inc 銅合金部材及び熱交換器
WO2014148127A1 (ja) 2013-03-19 2014-09-25 株式会社Uacj 高耐食性銅管

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6271826B1 (ja) 2016-09-29 2018-01-31 株式会社Uacj 高耐食性銅管

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001247923A (ja) * 2000-03-07 2001-09-14 Sanbo Copper Alloy Co Ltd 耐孔食性銅基合金管材
JP2008304170A (ja) * 2007-06-11 2008-12-18 Kobe Steel Ltd 耐スケール付着性熱交換器用伝熱管
JP2009235428A (ja) * 2008-03-25 2009-10-15 Kobelco & Materials Copper Tube Inc 銅合金部材及び熱交換器
WO2014148127A1 (ja) 2013-03-19 2014-09-25 株式会社Uacj 高耐食性銅管

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3495519A4 (en) * 2016-08-04 2019-12-25 UACJ Corporation HIGHLY CORROSION RESISTANT COPPER PIPE

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US20180291491A1 (en) 2018-10-11
KR20180039729A (ko) 2018-04-18

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