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Heat treatment process of high-strength and high-hardness Cu-Ni-Co-Si alloy strip

A cu-ni-co-si, high-hardness technology, applied in the heat treatment process field of high-strength and high-hardness Cu-Ni-Co-Si alloy strips, can solve the problem of Cu-Ni-Co-Si copper alloy strips Insufficient strength and hardness, etc., to achieve uniform structure and ensure uniformity

Inactive Publication Date: 2022-06-28
TAIYUAN JIN XI CHUNLEI COPPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and solve the technical problem of insufficient strength and hardness of the Cu-Ni-Co-Si series copper alloy strip prepared by the prior art. The present invention provides a high-strength and high-hardness Cu-Ni- Heat Treatment Process of Co-Si Alloy Strip

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A heat treatment process for a high-strength and high-hardness Cu-Ni-Co-Si alloy strip, comprising the following steps:

[0036] 1), casting ingots;

[0037] 2), ingot heating;

[0038] 3), hot rolling;

[0039] 4) The first solution annealing: the temperature of the first solution annealing is 750℃, and the cooling rate is 30℃ / s; after the first solution annealing, the hardness of the strip is 109HV and the conductivity is 22.3% IACS, the grain size is 0.008mm;

[0040] 5) Milling surface: the thickness of single-sided milling surface is 0.7mm;

[0041] 6), the first cold rolling: the processing rate is 82.8%, and the thickness of the strip is 2.5mm;

[0042] 7), trimming;

[0043] 8) The first aging annealing: the first aging annealing is carried out in a bell-type annealing furnace. After annealing, the tensile strength of the strip was 505 MPa, the elongation was 20.5%, the hardness was 145 HV, the electrical conductivity was 48.6% IACS, and the grain size was...

Embodiment 2

[0057] A heat treatment process for a high-strength and high-hardness Cu-Ni-Co-Si alloy strip, comprising the following steps:

[0058] 1), casting ingots;

[0059] 2), ingot heating;

[0060] 3), hot rolling;

[0061] 4) The first solution annealing: the temperature of the first solution annealing is 730℃, and the cooling rate is 30℃ / s; after the first solution annealing, the hardness of the strip is 115HV and the conductivity is 22.3% IACS, the grain size is 0.010mm;

[0062] 5) Milling surface: the thickness of single-sided milling surface is 0.7mm;

[0063] 6), the first cold rolling: the processing rate is 85%, and the thickness of the strip is 2.0mm;

[0064] 7), trimming;

[0065] 8) The first aging annealing: the first aging annealing is carried out in a bell-type annealing furnace. After aging annealing, the tensile strength of the strip is 600MPa, the elongation is 22.3%, the hardness is 165 HV, the electrical conductivity is 55.6%IACS, and the grain size is 0....

Embodiment 3

[0079] The difference from Example 2 is: the second aging annealing: the temperature of the second aging annealing is 420°C, the holding time is 6h, and the cooling rate is >50°C / h. The remaining steps and parameters are the same as those in Embodiment 2, and will not be repeated here.

[0080] The mechanical properties of the high-strength and high-hardness Cu-Ni-Co-Si alloy strip prepared in Example 3 are as follows: the hardness is 262HV, the tensile strength Rm is 940MPa, and the yield strength Rp 0.2 890MPa, elongation A 11.3 It is 10.5%, and the conductivity is 60.6% IACS, which meets the requirements of technical standards.

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Abstract

The invention relates to a heat treatment process of a high-strength and high-hardness Cu-Ni-Co-Si alloy strip, belongs to the technical field of heat treatment of non-ferrous metals, solves the technical problem of insufficient strength and hardness of a Cu-Ni-Co-Si series copper alloy strip prepared in the prior art, and adopts a reasonable processing rate to ensure the uniformity of product performance and size; a bell jar type annealing furnace is adopted for aging annealing, reasonable aging temperature and aging time are set, it is guaranteed that aging strengthening of the product is achieved, meanwhile, the conductivity of the product is considered, and a special cooling mode is adopted for aging annealing; and an air cushion furnace or a continuous annealing furnace is adopted for solution annealing, so that the structure is uniform after solution treatment. In a word, different solid solution annealing, aging annealing, cold rolling and finishing treatment processes are adopted, the cooling strength is controlled in the aging process, the aging strengthening characteristic of the alloy is fully utilized, and the prepared Cu-Ni-Co-Si series copper alloy strip meets the mechanical property requirement.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal heat treatment, and specifically relates to a heat treatment process for a high-strength and high-hardness Cu-Ni-Co-Si alloy strip. Background technique [0002] Cu-Ni-Co-Si alloys are a typical class of solid solution aging-strengthened alloys. Through process design, the alloys have comprehensive properties such as high strength, high elasticity, high electrical conductivity and excellent stress relaxation resistance, which can be widely used In the production of connectors, electrical connectors, lead frames, high-power integrated circuits, image and video electronic components and other electronic industries. [0003] The chemical composition of Cu-Ni-Co-Si copper alloy strip is as follows: Ni: 1.0~2.5%; Si: 0.5~1.2%; Co: 1.0~2.0%; Mg: 0.02~0.04%; Fe: ≤0.2% ; Zn: ≤ 1.0%; Mn: ≤ 0.20%; Pb: ≤ 0.05%, the rest is copper and inevitable impurities. At present, the general production proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/08C22C9/06C22C9/10
CPCC22F1/08C22C9/06C22C9/10
Inventor 韩彩香王少华李辉武鑫龙李素云王满丰赵伟鹏景洁兰嘉祺苏鹏冯泽强郑小英续致恒赵耿续昊
Owner TAIYUAN JIN XI CHUNLEI COPPER CO LTD