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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
  • B22D11/059—Mould materials or platings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
• • 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
  • C22C9/01—Alloys based on copper with aluminium as the next major constituent

Definitions

• the invention relates to the use of a curable Copper alloy as a material with specifically adjustable electrical conductivity for the production of Continuous casting molds in which molten Metal through the action of electromagnetic forces is stirred.
• the molten metal is melted during the casting process Stirring device under the influence of an electrical rotating field brought transversely to the strand withdrawal direction and through the emerging induction currents in a circular motion offset, which is essentially concentric to the longitudinal axis of the strand runs.
• the result is a homogeneous casting structure, that meets particularly high quality standards.
• Stirring devices usually below the mold, so that the remaining molten metal solidified in the partially Strand can be stirred just below the mold. But around the solidification structure also in the outer solidifying first It is to be able to influence edge areas of the strand favorable, the stirring device either at the level of the mold or to accommodate in the mold itself.
• the mold materials used in the continuous casting of steel usually have high mechanical strength at the same time a high thermal conductivity to ensure optimal Ensure heat dissipation and cooling performance.
• the one with it associated high maximum casting speed increases the Profitability of continuous steel casting.
• the high electrical Conductivity leads to an undesirably high shielding effect of the mold material in relation to the Stirring generated magnetic field. This weakening of the magnetic field results in a lower depth effect of the Stirring effects.
• the stirring effect can be increased by Amperage are increased, which, however, the necessary technical effort increases disproportionately. Overall, an optimal stirring effect with a high Mold materials with thermal conductivity are not reachable.
• the known mold materials with lower thermal conductivity thus represent no economical alternative to the highly conductive mold materials, such as copper-chrome-zirconium alloys, for use in Casting plants with electromagnetic stirring device.
• Continuous casting molds made of a copper-chrome-zirconium alloy with a Addition of up to 5% of at least one element from the group aluminum, Iron, silicon, nickel, tin, zinc and manganese are from JP-A-58 107 460 known.
• JP-A-58 212 839 is a high temperature resistant copper-chrome-zirconium alloy with 0.05 to 0.8% aluminum and other strength enhancers Additives described for the manufacture of continuous casting molds can be used.
• the object of the present invention is a curable copper material for use in casting plants with an electromagnetic stirring device to provide, which causes a low field loss and which continues has favorable strength and elongation at break properties.
• the solution to this problem is to use a curable Copper alloy made of 0.1 to 2.0% nickel, 0.3 to 1.3% chromium, 0.1 to 0.5% Zirconium, 0.005 to 0.05% of at least one element from the phosphorus, Group comprising magnesium and boron, optionally up to 0.2% titanium, up to to 0.4% iron and up to 0.8% manganese, the rest copper including production-related Impurities as a material with specifically adjustable electrical Conductivity for the manufacture of continuous casting molds in which molten metal stirred by the action of electromagnetic forces becomes.
• the alloy to be used according to the invention preferably contains 0.4 to 1.6% nickel, 0.6 to 0.8% chromium, 0.15 to 0.25% zirconium, at least one Element from the group 0.005 to 0.02% boron, 0.005 to 0.05% magnesium and 0.005 to 0.03% phosphorus, balance copper including unavoidable Impurities.
• the boron additive can be in the melt, for example, as calcium boride be added.
• the copper alloy according to the invention is surprisingly distinguished through a particularly advantageous combination of mechanical and physical Properties. With an electrical below 80% IACS Conductivity, this copper alloy also meets the essential requirement low field damping of a made from this alloy Mold wall.
• the alloy add up to 0.2% titanium and / or 0.4% iron.
• a low titanium content forms nickel and with the components present in the alloy Iron intermetallic compounds that increase strength.
• composition of eight sample alloys is given in Table 1 in% by weight.
• X denotes the total content of the individual elements boron, magnesium and / or phosphorus, which are added up to a total of 0.05% as deoxidizing agents. Higher levels can also be used to increase the strength of the alloy.
• Leg. Ni Cr Zr X Ti Fe Al Mn Cu 1 0.20 0.70 0.18 0.015 rest 2nd 0.38 0.65 0.16 0.016 rest 4th 0.81 0.68 0.16 0.014 rest 5 0.81 0.66 0.17 0.014 0.10 0.22 rest 6 1.25 0.70 0.15 0.015 rest 7 1.60 0.66 0.18 0.016 rest 8th 1.68 0.72 0.17 0.016 rest 9 2.0 0.73 0.16 0.013 rest
• Copper alloys with different nickel contents of 0.2 to 2%, about 0.7% chromium, 0.16 to 0.2% zirconium, up to 0.02% boron, magnesium and / or phosphorus, the rest of copper including manufacturing-related impurities were initially melted, cast into rolled ingots and then hot rolled at 950 ° C in several passes with a total degree of forming of 65%. After solution annealing at 1 030 ° C for at least one hour and subsequent quenching in water, the rolled plates were cured at 475 ° C for at least 4 hours. After final machining, the mold plates each had the property values summarized in Table 2, depending on the nickel content (0.2 to 2% nickel).
• the first-mentioned property value is assigned to the copper alloy with 0.2% nickel content to be used according to the invention.
• Yield strength at 350 ° C 270 to 290 N / mm 2 Elongation at break at 350 ° C 22 to 10%

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Continuous Casting (AREA)
• Adornments (AREA)
• Dental Preparations (AREA)
• Conductive Materials (AREA)
• Laminated Bodies (AREA)
• Macromonomer-Based Addition Polymer (AREA)
• Colloid Chemistry (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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• 1994
  • 1994-08-06 DE DE4427939A patent/DE4427939A1/de not_active Withdrawn
• 1995
  • 1995-06-29 EP EP95110134A patent/EP0702094B1/de not_active Expired - Lifetime
  • 1995-06-29 DE DE59507131T patent/DE59507131D1/de not_active Expired - Lifetime
  • 1995-06-29 AT AT95110134T patent/ATE186076T1/de active
  • 1995-06-29 ES ES95110134T patent/ES2139780T3/es not_active Expired - Lifetime
  • 1995-07-05 KR KR1019950019576A patent/KR100374051B1/ko not_active IP Right Cessation
  • 1995-07-24 RU RU95113726/02A patent/RU2160648C2/ru active
  • 1995-07-25 ZA ZA956181A patent/ZA956181B/xx unknown
  • 1995-07-31 PL PL95309841A patent/PL177973B1/pl unknown
  • 1995-08-03 CN CN95108676A patent/CN1058532C/zh not_active Expired - Lifetime
  • 1995-08-04 JP JP7200045A patent/JPH08104928A/ja active Pending
  • 1995-08-04 FI FI953730A patent/FI112669B/fi not_active IP Right Cessation
• 1997
  • 1997-07-28 US US08/901,820 patent/US6565681B1/en not_active Expired - Lifetime

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