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Chromium-zirconium-copper alloy for cold heading and preparation method of chromium-zirconium-copper alloy

A chromium-zirconium copper alloy technology, which is applied in the field of chromium-zirconium copper alloy for cold heading and its preparation, can solve the problems that the copper alloy bar for cold heading cannot be obtained, and it is difficult to limit the grain growth, so as to avoid the grain growth. Coarse problem, uniform and fine grain structure, weakening the effect of uneven grain size

Active Publication Date: 2021-06-18
JINTIAN COPPER GROUP CORP NINGBO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although trace elements can refine grains to a certain extent, it is still difficult to limit the growth of grains during the solid solution process, and it is also difficult to refine the coarse structure in the center of the bar to be consistent with the edge after cold deformation
Therefore, this process still cannot obtain copper alloy rods for cold heading with uniform structure and properties.

Method used

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  • Chromium-zirconium-copper alloy for cold heading and preparation method of chromium-zirconium-copper alloy
  • Chromium-zirconium-copper alloy for cold heading and preparation method of chromium-zirconium-copper alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The composition of copper chromium zirconium is: Cr: 0.55wt%, Zr: 0.9wt%, the rest is Cu and unavoidable impurities; the process flow of copper chromium zirconium rods:

[0033] 1) Casting: the copper-chromium-zirconium alloy wire billet is produced by the upward continuous casting method, with a diameter of 30 mm;

[0034] 2) One-time drawing: draw the wire blank with a diameter of 30mm to a diameter of 25mm, and the total deformation is 30.56%;

[0035] 3) Solid solution: solid solution the drawn wire billet at 960°C, keep it warm for 30 minutes, and quench it after the keep warm;

[0036] 4) Continuous extrusion: the wire billet after solid solution is continuously extruded, and the extrusion speed is set to 3m / min, and extruded into a wire billet with a diameter of 30mm; the extrusion ratio is 0.69;

[0037] 5) Secondary drawing: cold drawing the wire billet after continuous extrusion, and processing it to 16mm, with a total deformation of 71.56%;

[0038] 6) Agin...

Embodiment 2

[0042] The composition of copper chromium zirconium is: Cr: 0.85wt%, Zr: 0.12wt%, Si: 0.04wt%, Fe: 0.025wt%, Ti: 0.03wt%, the rest is Cu and unavoidable impurities; copper chromium zirconium rod Material process:

[0043] 1) Casting: the copper-chromium-zirconium alloy wire billet is produced by the upward continuous casting method, and the diameter is 35mm;

[0044] 2) One-time drawing: the wire blank with a diameter of 35mm is drawn to a diameter of 20mm, and the total deformation is 67.35%;

[0045] 3) Solid solution: solid solution the drawn wire billet at 940°C, keep it warm for 60 minutes, and quench it after the keep warm;

[0046] 4) Continuous extrusion: the wire billet after solid solution is continuously extruded, and the extrusion speed is set at 4.5m / min, and extruded into a wire billet with a diameter of 18mm; the extrusion ratio is 1.23;

[0047] 5) Secondary drawing: cold drawing the wire billet after continuous extrusion, and processing it to 16mm, with a tota...

Embodiment 3

[0052] The composition of copper chromium zirconium is: Cr: 0.85wt%, Zr: 0.12wt%, Si: 0.04wt%, Fe: 0.025wt%, Ti: 0.03wt%, the rest is Cu and unavoidable impurities; copper chromium zirconium rod Material process:

[0053] 1) Casting: the copper-chromium-zirconium alloy wire billet is produced by the upward continuous casting method, and the diameter is 35mm;

[0054] 2) One-time drawing: the wire blank with a diameter of 40mm is drawn to a diameter of 18mm, and the total deformation is 69.75%;

[0055] 3) Solid solution: solid solution the drawn wire billet at 950°C, keep it warm for 60 minutes, and quench it after the keep warm;

[0056] 4) Continuous extrusion: the wire billet after solid solution is continuously extruded, the extrusion speed is set at 4.5m / min, and extruded into a wire billet with a diameter of 18mm; the extrusion ratio is 1;

[0057] 5) Secondary drawing: cold drawing the wire billet after continuous extrusion, and processing it to 13mm, with a total def...

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Abstract

The invention discloses a chromium-zirconium-copper alloy for cold heading. The chromium-zirconium-copper alloy is characterized in that the average grain size of the chromium-zirconium-copper alloy is smaller than or equal to 4 [mu] m, and the standard deviation of the grain size is smaller than or equal to 1 / 2 of the average grain size. According to the chromium-zirconium-copper alloy, the average grain size of the chromium-zirconium-copper alloy is controlled to be smaller than or equal to 4 [mu] m, the standard deviation of the grain size is smaller than or equal to 1 / 2 of the average grain size, and the fine grain size means that the higher grain boundary volume fraction is achieved; due to the fact that the grain boundary structure is relatively loose, movement of grains during cold heading is facilitated, and the cold heading performance is improved; and in addition, the fine grain size and the more uniform grain size are beneficial to improving the smoothness of a cold heading product, and the cellulite phenomenon is avoided.

Description

technical field [0001] The invention relates to a copper alloy, in particular to a chromium-zirconium copper alloy for cold heading and a preparation method thereof. Background technique [0002] The materials of electrode caps, contact tips and other components used in the field of resistance welding must have excellent high strength, high conductivity and high temperature softening resistance due to their high temperature and high current environment. At the same time, since parts such as electrode caps are generally formed by cold heading, they are required to have excellent cold heading performance. Cold heading requires the material to have a uniform structure and appropriate strength. At present, the Cu-Cr-Zr rod used to prepare the electrode cap material adopts the preparation process of "casting + ingot heating + extrusion + solid solution + drawing + aging + finished product drawing". The crystal grains grow and grow, and then the subsequent drawing process will l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/02C22F1/08
CPCC22C9/00C22C1/02C22F1/08
Inventor 张宝刘喆刘关强许海丁成成
Owner JINTIAN COPPER GROUP CORP NINGBO
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