EP0111770A1 - Kupferlegierung für geschweisste Röhren - Google Patents

Kupferlegierung für geschweisste Röhren Download PDF

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Publication number
EP0111770A1
EP0111770A1 EP83111619A EP83111619A EP0111770A1 EP 0111770 A1 EP0111770 A1 EP 0111770A1 EP 83111619 A EP83111619 A EP 83111619A EP 83111619 A EP83111619 A EP 83111619A EP 0111770 A1 EP0111770 A1 EP 0111770A1
Authority
EP
European Patent Office
Prior art keywords
copper alloy
welded
alloy
resistance
test
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP83111619A
Other languages
English (en)
French (fr)
Other versions
EP0111770B1 (de
Inventor
Susumu Kawauchi
Masahiro Tsuji
Kiyoaki Nishikawa
Junji Miyake
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Mining Holdings Inc
Original Assignee
Nihon Kogyo KK
Nippon Mining Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nihon Kogyo KK, Nippon Mining Co Ltd filed Critical Nihon Kogyo KK
Publication of EP0111770A1 publication Critical patent/EP0111770A1/de
Application granted granted Critical
Publication of EP0111770B1 publication Critical patent/EP0111770B1/de
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/04—Alloys based on copper with zinc as the next major constituent

Definitions

  • This invention relates to copper alloys for use in making welded tubes with excellent resistance to corrosion and weld cracking. This invention also relates to a welded tube produced by welding such copper alloy member.
  • Thin-walled copper alloy tubes fabricated by high-frequency resistance welding or high-frequency induction welding rather than by traditional tube-making processes, have increasingly come into use in recent years. This tendency is most pronounced in the field of radiator tubes.
  • the ordinary lock seamed tubes are being replaced by tubes welded by the high-frequency resistance or induction technique that meets the modern requirements for lower cost and higher production efficiency.
  • the copper alloy tubes welded in that way have a common disadvantage of far less corrosion resistance of the welds than the remainder, because of their peculiar welded structures. This is a serious limitation to the use of the welded copper alloy tubes, particularly in the ever aggravating service environments.
  • the copper alloy tubes fabricated by the high-frequency induction or resistance welding are susceptible to weld cracking, a defect inherent to either welding process.
  • weld cracking a defect inherent to either welding process.
  • copper alloys for applications as welded tubes with improved corrosion and weld cracking resistance have now been developed which comprise 25 to 40% zinc, 0.005 to 0.070% phosphorus, 0.05 to 1.0% each tin and aluminum, all by weight, and the balance copper and unavoidable impurities. It is preferable that the grain size is adjusted to be not more than 0.015 mm by final annealing for enhanced weld cracking resistance.
  • FIG. 1 is a cross sectional view of a tube for a weld cracking test
  • FIG. 2 is a schematic view illustrating an arrangement for testing the weld cracking of a test tube by a weight dropped inside a heating furnace.
  • Copper and zinc which form two major component materials of the copper-base alloys according to the invention, are both excellent in corrosion resistance, workability, mechanical strength, and also in thermal conductivity.
  • the zinc proportion is restricted to the range specified because less than 25 wt% zinc will adversely affect the workability of the resulting alloy whereas more than 40 wt% zinc will cause ⁇ -phase precipitation in the copper-zinc alloy and impair the corrosion resistance and cold workability of the objective alloy.
  • the phosphorus content should be in the range of 0.005 to 0.070 wt% because if it is below the lower limit no improvement in corrosion resistance will result and if the amount exceeds the upper limit an indication of intercrystalline corrosion will appear despite improved general corrosion resistance.
  • the tin amount is defined to be in the range of 0.05 to 1.0 Wt% because less than O.D5 wtt tin will not impart added corrosion resistance, especially to the welds of welded products, while no more beneficial effect on the corrosion resistance will be achieved by the addition in excess of 1.0 wtt, which is the saturation point. Exactly the same numerical range applies to aluminum. Again the addition of less than 0.05 wt% will not improve the corrosion resistance, especially of the welds, and the larger addition of more than 1.0 wt% aluminum will merely saturate and will no longer enhance the corrosion-resisting effect.
  • the grain size of the objective alloy after final annealing is limited to 0.015 mm or less because the size exceeding the limit tends to cause weld cracking.
  • Alloys of the compositions shown in Table 1 were prepared by melting. The solidified alloys were hot rolled and then, with suitable annealing, cold rolled to sheets one millimeter thick. After final annealing at varied temperatures, the sheets were tested. Welded test pieces for corrosion resistance tests were made by butt welding the 1-mm-thick alloy sheets of the compositions in Table 1 by the T IG method. The corrosion resistance test was conducted by dissolving 1.3 g sodium hydrogen carbonate, 1.5 g sodium sulfate, and 1.6 g sodium chloride in one liter of water, and immersing each welded test piece in the solution kept at 88°C, with introduction of 100 ml air per minute, for 240 hours.
  • the test on the resistance to weld cracking due to embrittlement of the grain boundaries of the weld in contact with the molten base metal was performed in the following way.
  • the 1-mm-thick sheet of each alloy of the composition in Table 1 was worked into a tubular form as illustrated in Fig. 1.
  • the tube had the inside diameter a of 20 mm and the outside diameter bof 22 mm.
  • the test tube was dipped for 3 seconds in a molten metal of the same composition kept at a temperature of its melting point plus 50°C.
  • the tube was taken out of the bath into a heating furnace and was subjected to an impact test in a test arrangement as shown in Fig. 2 while the metal deposited on its surface was still in the molten state.
  • Fig. 2 As shown in Fig.
  • test tube 1 was placed on a supporting table 2.
  • a falling weight 3 of 200 gw was set above the test tube at a distance C of 50 mm. The weight was freely falled in the direction d against the test tube.
  • the ringlike cross sectional contour of the test piece was inspected under a microscope to see if there had occurred any intercrystalline crack.
  • the alloys of the invention have improved weld cracking resistance as well as excellent resistance to dezincification corrosion at both the base metal and the weld.
  • the dezicncification corrosion reached the depths of 70 to 125 ⁇ m in the base metals and 165 to 413 ⁇ m in the welds of comparative alloy test pieces (Noa. 1-3 and 19-21), whereas the alloy test pieces of the invention (Nos. 4-18) were corroded only 8 up to 15 ⁇ m deep in the base metals and only 15 up to 63 ⁇ m deep in the welds, indicating the superiority to the ordinary alloys in the resistance to dezincification corrosion.
  • Table 3 shows that, of the test alloys according to the invention all of which are exceedingly resistant to dezincification corroaion, those having grain sizes of not greater than 0.015 mm will not undergo intercryatalline cracking upon subjection to impact while in contact with molten base metal and prove less susceptible to intercrystalline embrittlement and more excellent in weld cracking resistance than the alloys of grain sizes in excess of 0.015 mm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Arc Welding In General (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
EP19830111619 1982-11-24 1983-11-21 Kupferlegierung für geschweisste Röhren Expired EP0111770B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP204561/82 1982-11-24
JP20456182A JPS6056775B2 (ja) 1982-11-24 1982-11-24 溶接管用銅合金

Publications (2)

Publication Number Publication Date
EP0111770A1 true EP0111770A1 (de) 1984-06-27
EP0111770B1 EP0111770B1 (de) 1986-02-26

Family

ID=16492508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830111619 Expired EP0111770B1 (de) 1982-11-24 1983-11-21 Kupferlegierung für geschweisste Röhren

Country Status (3)

Country Link
EP (1) EP0111770B1 (de)
JP (1) JPS6056775B2 (de)
DE (1) DE3362354D1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103480987B (zh) * 2013-09-26 2015-08-19 郑州机械研究所 一种高脆性铜锌焊丝/焊片的制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR894529A (fr) * 1939-05-30 1944-12-27 Alliage de cuivre
FR1512930A (fr) * 1966-03-01 1968-02-09 Olin Mathieson Alliages à base de cuivre et notamment de fer
FR2249173A1 (de) * 1973-10-24 1975-05-23 Wieland Werke Ag

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR894529A (fr) * 1939-05-30 1944-12-27 Alliage de cuivre
FR1512930A (fr) * 1966-03-01 1968-02-09 Olin Mathieson Alliages à base de cuivre et notamment de fer
FR2249173A1 (de) * 1973-10-24 1975-05-23 Wieland Werke Ag

Also Published As

Publication number Publication date
DE3362354D1 (en) 1986-04-03
EP0111770B1 (de) 1986-02-26
JPS6056775B2 (ja) 1985-12-11
JPS5996237A (ja) 1984-06-02

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