# US 5,705,125 A · Wire for electric railways > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,705,125 A - Document ID: US5705125A - Status: Granted - Kind: A - Application number: 08/343,110 - Filed: 1994-11-22 - Granted: 1998-01-06 - Earliest claimed: 1992-05-08 - Assignees: Mitsubishi Materials Corporation; Railway Technical Research Institute - Inventors: Motoo Goto; Shizuo Kawakita; Yoshiharu Mae; Takuro Iwamura; Yutaka Koshiba; Kenji Yajima; Syunji Ishibashi; Hiroki Nagasawa; Atsushi Sugahara; Sumihisa Aoki; Haruhiko Asao - Web page: https://patentgrep.com/patent/US5705125A ## CPC - C22F 1/08: of copper or alloys based thereon - C22C 9/00: Alloys based on copper - H01B 1/026: {Alloys based on copper} - C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00) - C22C: ALLOYS (treatment of alloys C21D, C22F) - H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K}) ## Abstract A wire for electric railways comprises a copper alloy which consists essentially, by weight percent, of 0.1 to 1.0% Cr, 0.01 to 0.3% Zr, 0.05 to 0.15% Sn, and 10 ppm or less O, and if required, further contains 0.01 to 0.1% Si, or 0.01 to 0.1% Si and 0.001 to 0.05% Mg, with the balance being Cu and inevitable impurities. ## Claims ### Claim 1 In a wire for an overhead line for an electric railway, the improvement comprising said wire being formed of a copper alloy consisting essentially, by weight percent, of 0.1 to 1.0% Cr, 0.01 to 0.3% Zr, 0.05 to 0.15% Sn, 0.01 to 0.1% Si, 10 ppm or less O, and the balance of Cu and inevitable impurities, and the wire having an electrical conductivity of at least about 80% IACS. ### Claim 2 (depends on 1) The wire for an overhead line for an electric railway as claimed in claim 1, consisting, by weight percent, of 0.15% to 0.50% Cr, 0.05% to 0.25% Zr, 0.07 to 0.12% Sn, 0.01 to 0.05% Si, 7 ppm or less O, and the balance of Cu and inevitable impurities. ### Claim 3 (depends on 1) The wire for an overhead line for an electric railway, as claimed in claim 1, wherein the copper alloy consists of 0.25 weight % Cr, 0.08 weight % Zr, 0.05 weight % Sn, 0.02 weight % Si, 6 ppm O and the balance being Cu and inevitable impurities. ### Claim 4 (depends on 1) The wire for an overhead line for an electric railway, as claimed in claim 1, wherein the copper alloy consists of 0.78 weight % Cr, 0.12 weight % Zr, 0.09 weight % Sn, 0.02 weight % Si, 7 ppm O and the balance being Cu and inevitable impurities. ### Claim 5 (depends on 1) The wire for an overhead line for an electric railway, as claimed in claim 1, wherein the copper alloy consists of 0.17 weight % Cr, 0.25 weight % Zr, 0.11 weight % Sn, 0.03 weight % Si, 5 ppm O and the balance being Cu and inevitable impurities. ### Claim 6 (depends on 1) The wire for an overhead line for an electric railway, as claimed in claim 1, wherein the copper alloy consists of 0.82 weight % Cr, 0.03 weight % Zr, 0.08 weight % Sn, 0.04 weight % Si, 4 ppm O and the balance being Cu and inevitable impurities. ### Claim 7 (depends on 1) The wire for an overhead line for an electric railway, as claimed in claim 1, wherein the copper alloy consists of 0.12 weight % Cr, 0.08 weight % Zr, 0.09 weight % Sn, 0.06 weight % Si, 4 ppm O and the balance being Cu and inevitable impurities. ### Claim 8 (depends on 1) The wire for an overhead line for an electric railway, as claimed in claim 1, wherein the copper alloy consists of 0.20 weight % Cr, 0.09 weight % Zr, 0.12 weight % Sn, 0.08 weight % Si, 6 ppm O and the balance being Cu and inevitable impurities. ### Claim 9 (depends on 1) The wire for an overhead line for an electric railway, as claimed in claim 1, wherein the copper alloy consists of 0.54 weight % Cr, 0.13 weight % Zr, 0.13 weight % Sn, 0.09 weight % Si, 5 ppm O and the balance being Cu and inevitable impurities. ### Claim 10 In a wire for an overhead line for an electric railway, the improvement comprising said wire being formed of a copper alloy consisting essentially, by weight percent, of 0.1 to 1.0% Cr, 0.01 to 0.3% Zr, 0.05 to 0.15% Sn, 0.01 to 0.1% Si, 0.001 to 0.05% Mg, 10 ppm or less O, and the balance of Cu and inevitable impurities, and the wire having an electrical conductivity of at least about 80% IACS. ### Claim 11 (depends on 10) The wire for an overhead line for an electric railway, as claimed in claim 10, consisting, by weight percent, of 0.15% to 0.50% Cr, 0.05% to 0.25% Zr, 0.07 to 0.12% Sn, 0.01 to 0.05% Si, 0.005 to 0.03% Mg, 7 ppm or less O, and the balance of Cu and inevitable impurities. ### Claim 12 (depends on 10) The wire for an overhead line for an electric railway, as claimed in claim 10, wherein the copper alloy consists of 0.35 weight % Cr, 0.08 weight % Zr, 0.06 weight % Sn, 0.03 weight % Si, 0.002 weight % Mg, 4 ppm O and the balance being Cu and inevitable impurities. ### Claim 13 (depends on 10) The wire for an overhead line for an electric railway, as claimed in claim 10, wherein the copper alloy consists of 0.36 weight % Cr, 0.10 weight % Zr, 0.08 weight % Sn, 0.02 weight % Si, 0.012 weight % Mg, 4 ppm O and the balance being Cu and inevitable impurities. ### Claim 14 (depends on 10) The wire for an overhead line for an electric railway, as claimed in claim 10, wherein the copper alloy consists of 0.29 weight % Cr, 0.10 weight % Zr, 0.07 weight % Sn, 0.03 weight % Si, 0.043 weight % Mg, 4 ppm O and the balance being Cu and inevitable impurities. ### Claim 15 (depends on 10) The wire for an overhead line for an electric railway, as claimed in claim 10, wherein the copper alloy consists of 0.33 weight % Cr, 0.11 weight % Zr, 0.10 weight % Sn, 0.05 weight % Si, 0.03 weight % Mg, 6 ppm O and the balance being Cu and inevitable impurities. ### Claim 16 (depends on 10) The wire for an overhead line for an electric railway, as claimed in claim 10, wherein the copper alloy consists of 0.30 weight % Cr, 0.09 weight % Zr, 0.15 weight % Sn, 0.06 weight % Si, 0.011 weight % Mg, 3 ppm O and the balance being Cu and inevitable impurities. ### Claim 17 (depends on 10) The wire for an overhead line for an electric railway, as claimed in claim 10, wherein the copper alloy consists of 0.31 weight % Cr, 0.10 weight % Zr, 0.11 weight % Sn, 0.05 weight % Si, 0.038 weight % Mg, 5 ppm O and the balance being Cu and inevitable impurities. ### Claim 18 (depends on 10) The wire for an overhead line for an electric railway, as claimed in claim 10, wherein the copper alloy consists of 0.12 weight % Cr, 0.28 weight % Zr, 0.13 weight % Sn, 0.08 weight % Si, 0.021 weight % Mg, 3 ppm O and the balance being Cu and inevitable impurities.