EP0987338B1 - Verfahren zur Herstellung von geschweissten Rohren aus Kupfer - Google Patents
Verfahren zur Herstellung von geschweissten Rohren aus Kupfer Download PDFInfo
- Publication number
- EP0987338B1 EP0987338B1 EP99250159A EP99250159A EP0987338B1 EP 0987338 B1 EP0987338 B1 EP 0987338B1 EP 99250159 A EP99250159 A EP 99250159A EP 99250159 A EP99250159 A EP 99250159A EP 0987338 B1 EP0987338 B1 EP 0987338B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- phosphorus
- melt
- process according
- copper
- feed channel
- 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.)
- Expired - Lifetime
Links
- 229910052802 copper Inorganic materials 0.000 title claims description 34
- 239000010949 copper Substances 0.000 title claims description 34
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 35
- 229910052698 phosphorus Inorganic materials 0.000 claims description 34
- 239000011574 phosphorus Substances 0.000 claims description 34
- 238000005266 casting Methods 0.000 claims description 20
- 239000000155 melt Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 18
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000005097 cold rolling Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 3
- 239000012080 ambient air Substances 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000005098 hot rolling Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000010406 cathode material Substances 0.000 claims 1
- 230000007717 exclusion Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- 238000005096 rolling process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 150000003017 phosphorus Chemical class 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate group Chemical group S(=O)(=O)([O-])[O-] QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/006—Pyrometallurgy working up of molten copper, e.g. refining
Definitions
- the invention relates to a method for producing welded pipes made of Cu and Cu alloys in a combined production line consisting of one in Line arranged melting furnace, a casting furnace, a belt caster, a Hot rolling mill, a cooling section, a cold rolling mill and a coil device, as well as the subsequent pipe forming and welding section with a subsequent one if necessary Pulling device for the welded pipe.
- a process is not in the Pre-published German patent application 197 34 780.0 described.
- the process described is advantageous because it is in a continuous Process flow is economically capable of welding copper pipes and tubes to produce from copper alloys in low to high capacity.
- the continuous Process sequence using casting machines with very high Casting speeds enable high capacity on the one hand, without that on the other To negatively influence the quality of the pipes. This is the first time in practice created a useful method for producing welded non-ferrous metal pipes, the due to its high capacity, flexibility and low cost is economically applicable
- Copper cathodes contain minor Amounts of oxygen, u. a. from adhering sulfate residues. Because oxygen in one hand small amounts have only a slight harmful influence on the electrical, has mechanical and physical properties of copper and on the other hand the Oxygen oxidizes other contaminants, its presence reduces that Conductivity and cold formability of the copper hardly. For this reason, in the Electrical engineering mostly uses oxygen-containing copper. When soldering and welding however, there is a risk of hydrogen embrittlement from oxygen-containing copper, therefore such types of copper cannot be used for the production of pipes become. Oxygen-free copper is required here.
- oxygen-free copper molten metal special reducing agent also as a deoxidizer referred to, such as adding phosphorus (see, for example, JP-06 212 300 A).
- a deoxidizer such as adding phosphorus
- the deoxidizers in the Excess they reduce the electrical conductivity and thermal conductivity; this reduction is used in pipe technology, i.e. in construction and Apparatus construction, but accepted in favor of weldability. It is therefore in usually a copper with a small excess of phosphorus is used.
- the object of the present invention is to implement the method described at the outset Manufacture of welded copper pipes through further process steps optimize that improve the weldability of the rolled strip and thus the Allow production of a longitudinally welded pipe of high quality.
- an oxygen-free pipe should therefore be used for longitudinally welded pipes Copper with 0.015 to 0.040% phosphorus with a fluctuation range of ⁇ 30 ppm be used.
- the known wire rod processes for electrolytic copper usually work with gas-fired casting furnaces. These are disadvantageous for oxygen-free copper; because on This is due to the insufficient bath movement of the melt in such furnaces Tolerance field of the residual phosphorus content used for the manufacture of welded Pipe is essential not to be followed.
- the invention proposes before that the mixing of the melt in the Casting furnace or in the feed trough by means of alternating electromagnetic fields inductive stirring coil. Due to the even distribution of the phosphorus in the Melt is achieved that when welding the pipe due to constant Conductivity in the welding tube band fewer errors occur, the quality of the tube gets better and the reject rate drops.
- the casting furnace or the feed trough can be gas-heated or else be heated inductively.
- the bath can the melt is set in motion by an additional inductive stirring coil become.
- Inductive-heated casting furnaces which are suitable for Channel or crucible inductors are equipped, their electromagnetic Alternating fields are used to make the copper melt intense as well to mix that the phosphorus content only fluctuates by ⁇ 30 ppm.
- the oxygen content and / or the Average residual phosphorus content of the melt can be measured and used on hand the measured values determine the amount of phosphorus added to the melt which is required to bind the remaining oxygen in the liquid copper and to raise the total phosphorus content to the required value.
- the oxygen content in the melt is measured before the addition of Phosphorus.
- the phosphorus content of the melt is preferably between values 0.018% and 0.030% set.
- the measurement can be made continuously or at appropriate intervals over a period below Ambient air closure working phosphor dosing with which the amount of phosphorus required for deoxidation as phosphor-copper granules the melt is removed.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Continuous Casting (AREA)
Description
Claims (8)
- Verfahren zur wirtschaftlichen Herstellung von geschweißten Rohren aus Cu und Cu-Legierungen in einer kombinierten Fertigungslinie, bestehend aus einem in Linie angeordneten Schmelzofen, einem Gießofen, einer Bandgießanlage, einem Warmwalzwerk, einer Kühlstrecke, einem Kaltwalzwerk und einer Coileinrichtung, sowie anschließender Rohreinform- und Schweißstrecke mit ggf. nachfolgender Zieheinrichtung für das geschweißte Rohr,
wobei Rücklauf- oder Kathodenmaterial im Schmelzofen zu Vormaterial für die geschweißten Rohren erschmolzen und über eine Zuführrinne in den Gießofen geleitet wird, zur Desoxidation der Schmelze zu sauerstofffreiem Kupfer als Reduktionsmittel Phosphor in geringer Menge in den Gießofen oder unmittelbar in die Zuführrinne eingeführt wird und die Schmelze in dem Gießofen oder in der Zuführrinne mit dem Phosphor durchmischt wird, wobei die Durchmischung der Schmelze in dem Gießofen oder in der Zuführrinne mittels elektromagnetischer Wechselfelder einer induktiver Rührspulen erfolgt. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß die Menge des eingeführten Phosphors so dosiert wird, daß in der desoxidierten Schmelze 0,015 bis 0,040 % Phosphor in einer Schwankungsbreite von ± 30 ppm enthalten sind. - Verfahren nach Anspruch 1 und 2,
dadurch gekennzeichnet, daß der Gießofen oder die Zuführrinne gasbeheizt wird. - Verfahren nach Anspruch 1 und 2,
dadurch gekennzeichnet, daß der Gießofen oder die Zuführrinne induktiv beheizt wird. - Verfahren nach Anspruch 1 bis 4,
dadurch gekennzeichnet, daß der Sauerstoffgehalte und/oder der durchschnittliche Restphosphorgehalt der Schmelze gemessen werden und an Hand der gemessenen Werte die Mengenzugabe des Phosphors in die Schmelze bestimmt wird, die benötigt wird, um den restlichen Sauerstoff im flüssigen Kupfer zu binden und den Gesamt-Phosphorgehalt auf den geforderten Wert anzuheben - Verfahren nach Anspruch 5,
dadurch gekennzeichnet, daß die Messungen kontinuierlich oder in angemessenen Zeitabständen erfolgen und der Phosphorgehalt in der Schmelze durch Dosierung des zugeführten Phosphors automatisch konstant gehalten wird. - Verfahren nach Anspruch 1 bis 6,
dadurch gekennzeichnet, daß über eine unter Umgebungsluftabschluß arbeitende Phosphordosiereinrichtung die zur Desoxidation erforderliche Menge von Phosphor als Phosphor-Kupfer-Granulat an die Schmelze abgeführt wird. - Verfahren nach Anspruch 1 bis 7,
dadurch gekennzeichnet, daß der Phosphorgehalt der Schmelze auf Werte zwischen 0,018 % und 0,030 % eingestellt wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843235 | 1998-09-09 | ||
DE19843235 | 1998-09-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0987338A1 EP0987338A1 (de) | 2000-03-22 |
EP0987338B1 true EP0987338B1 (de) | 2003-06-25 |
Family
ID=7881702
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99250159A Expired - Lifetime EP0987338B1 (de) | 1998-09-09 | 1999-05-19 | Verfahren zur Herstellung von geschweissten Rohren aus Kupfer |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0987338B1 (de) |
DE (1) | DE59906069D1 (de) |
ES (1) | ES2196718T3 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107805722A (zh) * | 2017-12-12 | 2018-03-16 | 芜湖精艺铜业有限公司 | 无氧铜铸造炉 |
CN115493402A (zh) * | 2022-08-29 | 2022-12-20 | 金川集团股份有限公司 | 一种工频感应炉熔沟凝固和二次起熔的方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB951550A (en) * | 1961-06-21 | 1964-03-04 | Foseco Int | Degassing and deoxidation of copper and copper-base alloys |
AT235586B (de) * | 1961-10-12 | 1964-09-10 | Siemens & Halske Ag M B H | Verfahren zum Schmelzen von Kupfer und Kupferlegierungen im Induktionsofen |
JPS52145327A (en) * | 1976-05-31 | 1977-12-03 | Furukawa Metals Co | Copper alloy with anti softening property |
JP3235237B2 (ja) * | 1993-01-14 | 2001-12-04 | 株式会社神戸製鋼所 | シャフト炉を用いたp含有低酸素銅の製法 |
DE19734780C1 (de) * | 1997-08-06 | 1998-12-10 | Mannesmann Ag | Verfahren zur Herstellung von geschweißten Rohren aus Cu und Cu-Legierungen |
-
1999
- 1999-05-19 DE DE59906069T patent/DE59906069D1/de not_active Expired - Fee Related
- 1999-05-19 ES ES99250159T patent/ES2196718T3/es not_active Expired - Lifetime
- 1999-05-19 EP EP99250159A patent/EP0987338B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2196718T3 (es) | 2003-12-16 |
EP0987338A1 (de) | 2000-03-22 |
DE59906069D1 (de) | 2003-07-31 |
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