High-strength and high-conductivity copper-magnesium alloy for dropper, wire rod and preparation method of wire rod

A copper-magnesium alloy, high-strength technology, applied in the field of alloys, can solve problems such as the inability to realize wire production, and achieve the effects of improving thermal processing performance, improving plasticity, and refining grains

Pending Publication Date: 2021-10-01
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the easily oxidizable magnesium element in the copper-chromium alloy, the alloy wire usually adopts vacuum semi-continuous casting, hot extrusion, cold drawing and corresponding heat treatment process. Due to the limitation of the capacity of the vacuum melting furnace, this method cannot realize the large length of the wire. (length greater than 300km) production

Method used

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  • High-strength and high-conductivity copper-magnesium alloy for dropper, wire rod and preparation method of wire rod
  • High-strength and high-conductivity copper-magnesium alloy for dropper, wire rod and preparation method of wire rod

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The Cu-0.5Mg-0.06Cr alloy is prepared, and the raw materials are: A-grade cathode copper, pure magnesium, Cu-5%Cr, and the proportion is according to the weight of the components.

[0026] (1) Upward continuous casting: use non-vacuum power frequency induction furnace for continuous upward casting. Before smelting, add cathode copper and pure magnesium into the non-vacuum power frequency induction furnace. Protected by pure argon, then add Cu-5%Cr intermediate alloy, raise the temperature to 1300°C, after the melt is completely melted, stir evenly, control the casting temperature at 1200°C, and carry out upward continuous casting after holding for 20min. The distance is 3mm, the stop time is 0.24s, the pulling time is 0.06s, the pulling speed is 600mm / min, cast into a copper rod with a diameter of 20mm.

[0027] (2) Continuous extrusion: the above-mentioned alloy copper rod is subjected to multi-pass continuous extrusion on a Conform continuous extrusion machine. The he...

Embodiment 2

[0037]The Cu-0.7Mg-0.02Cr-0.045La alloy is prepared, and the raw materials are: A-level cathode copper, pure magnesium, Cu-5%Cr, and Cu-La master alloy, according to the composition weight ratio.

[0038] (1) Upward continuous casting: use non-vacuum power frequency induction furnace for continuous upward casting. Before smelting, add cathode copper and pure magnesium into the non-vacuum power frequency induction furnace. Pure argon for protection, then add Cu-5%Cr, Cu-La intermediate alloy, raise the temperature to 1250°C, after the melt is completely melted, stir evenly, control the casting temperature at 1150°C, keep it warm for 20min and then carry out the upper lead Continuous casting, the pitch is 1.5mm, the stop time is 0.21s, the pulling time is 0.09s, the pulling speed is 400mm / min, and cast into a copper rod with a diameter of 20mm.

[0039] (2) Continuous extrusion: the above-mentioned alloy copper rod is subjected to multi-pass continuous extrusion on a Conform con...

Embodiment 3

[0049] The Cu-0.6Mg-0.04Cr-0.02Zr alloy is prepared, and the raw materials are: A-grade cathode copper, pure magnesium, Cu-5%Cr, Cu-10%Zr master alloy, according to the composition weight ratio.

[0050] (1) Melting and casting: use a non-vacuum power frequency induction furnace for continuous upward casting. Before smelting, add cathode copper and pure magnesium into the non-vacuum power frequency induction furnace. After the above materials are all melted, feed high-purity Protected by argon, then add Cu-5%Cr intermediate alloy and Cu-10%Zr, raise the temperature to 1280°C, stir evenly after the melt is completely melted, control the casting temperature at 1180°C, keep it warm for 20min and then carry out Lead continuous casting, the pitch is 2mm, the stop time is 0.18s, the pulling time is 0.12s, the drawing speed is 480mm / min, and cast into a copper rod with a diameter of 20mm.

[0051] (2) Continuous extrusion: the above-mentioned alloy copper rod is subjected to multi-pa...

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Abstract

The invention relates to a high-strength and high-conductivity copper-magnesium alloy for a dropper, a wire rod and a preparation method of the wire rod, and belongs to the technical field of alloys. The alloy comprises the following components in percentage by mass: 0.2 to 0.7 percent of Mg, 0.02 to 0.06 percent of Cr or Cr + Zr, 0 to 0.045 percent of La, 0 to 0.045 percent of Ce and the balance of Cu. The wire rod made of the alloy has a monofilament diameter of 0.5 to 0.65 mm. The preparation method of the wire rod comprises the steps of up-drawing continuous casting, continuous extrusion, primary drawing, bell jar type intermediate annealing, secondary drawing and online annealing treatment. According to the novel copper-magnesium alloy wire rod prepared through the method, the monofilament tensile strength is larger than or equal to 650 MPa, the electric conductivity is larger than or equal to 62% IACS, the elongation is larger than or equal to 6%, the repeated bending frequency is larger than or equal to 12, the softening temperature is larger than or equal to 550 DEG C, and the performance meets the standard of TB / T 3111-2017 Copper and copper alloy stranded conductors for electrified Railway.

Description

technical field [0001] The invention belongs to the field of alloy technology, and in particular relates to a high-strength and high-conductivity copper-magnesium alloy and wire rod for hanging strings and a preparation method thereof. Background technique [0002] With the rapid development of railway electrification, the speed of railway transportation continues to increase, which puts forward higher requirements for the key components of electrified catenary. Suspension string is an important part of high-speed railway catenary equipment, which has dual functions of bearing capacity and current carrying. With the complex and changeable environment for the installation and use of high-speed railway catenary suspension strings, the continuous improvement of high-speed railway operation speeds, and the accumulation of suspension string service life, suspension string failures often occur, and suspension string broken strands and broken faults have become the impact Outstand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/03B21C37/04C22F1/08
CPCC22C9/00C22C1/03B21C37/047C22F1/08
Inventor 张文婧米绪军解浩峰彭丽军黄国杰杨振冯雪尹向前
Owner GRIMAT ENG INST CO LTD
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