Short-process preparation method for c19210 high-performance copper strip to be used in solar photovoltaic field

Abstract

A short-process preparation method for a C19210 high-performance copper strip to be used in the solar photovoltaic field. The short-process preparation method comprises the following steps: semi-continuous casting of cast ingots, heating, hot rolling and on-line quenching, off-line milling, first cold rolling, an edge treatment, a heat treatment, cleaning, second cold rolling, cleaning, plate shape straightening, slitting, and product packaging. The C19210 copper strip to be used in the solar photovoltaic field produced by using the technical solution has a tensile strength of 350-400 MPa, an elongation at facture A11.3 of 10-15%, a Vickers hardness of 115-125 HV, and an electric conductivity of 86% IACS or more. Under the condition that the high performance requirements of the copper strip to be used in the solar photovoltaic field are met, the production process is shortened, thereby achieving the purposes of reducing cost and increasing benefits.

Description

Short process preparation method of C19210 high-performance copper strip for solar photovoltaic field TECHNICAL FIELD

[0001] The present application relates to the technical field of new material preparation, in particular to a short process preparation method of C19210 high-performance copper strip for solar photovoltaic field. BACKGROUND

[0002] Photovoltaic power generation is a technology that converts light energy into electricity by using the photovoltaic effect of the semiconductor interface. In recent years, under the impetus of the carbon peak and carbon neutralization target, the domestic photovoltaic industry has ushered in a major development opportunity period, with a new high in the scale of new development, continuous progress in the scale and technical level of newly built projects, and rapid progress in production value and export.

[0003] The copper strip for photovoltaic is a copper alloy strip product suitable for the solar photovoltaic field, and the product performance mainly has higher requirements in terms of electrical conductivity and elongation. The conventional preparation process of C19210 copper strip for solar photovoltaic field is: ingot semi-continuous casting, heating, hot rolling and online quenching, offline milling, first cold rolling, edge treatment, heat treatment, cleaning, second cold rolling, heat treatment, cleaning, third cold rolling, cleaning, flat straightening, slitting, and finished product packaging. The conventional preparation process of C19210 copper strip includes three cold rolling, two heat treatment, and three cleaning. The C19210 copper strip produced by the technical scheme has a tensile strength of 350-400Mpa, a Vickers hardness of 115HV-125HV, an electrical conductivity of not less than 85%IACS, and an elongation A 11.3 ≤9%. The downstream customers have high requirements for elongation during the bending process, and also have high requirements for the electrical properties of the raw material. Moreover, the preparation process of the C19210 copper strip is slightly cumbersome, and in the current rapid development of the photovoltaic industry, how to improve the production efficiency of the C19210 copper strip has become a major technical problem. SUMMARY

[0004] The technical problem to be solved by the present application is to improve the elongation and electrical conductivity performance indicators of the C19210 copper strip for solar photovoltaic field under the condition of shortening the production process, thereby providing a short process preparation method of C19210 high-performance copper strip for solar photovoltaic field.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows: a short-process preparation method of C19210 high-performance copper strip for the field of solar photovoltaics, comprising the following steps: ingot semi-continuous casting, heating, hot rolling and online quenching, offline milling, first cold rolling, edge treatment, heat treatment, cleaning, second cold rolling, cleaning, plate shape straightening, slitting, and finished product packaging.

[0006] The smelting and casting temperature is 1130-1150 DEG C.

[0007] The heating temperature is 930-950 DEG C.

[0008] The online quenching temperature is 560-610 DEG C; the material is heated to the set temperature range and then rapidly cooled, so that the internal structure of the material rapidly changes to form quenched structure.

[0009] The offline milling is milling surface treatment on the upper and lower surfaces and the two edge portions, so that the surface and end surface of the copper coil after hot rolling are kept bright and clean.

[0010] The first cold rolling processing rate ranges from 86% to 92%; the material is plastically deformed and strengthened under large power, so that the internal dislocation density of the material increases, the dislocations are intertwined with each other, a cellular structure is formed to hinder the movement of dislocations, and the number of dislocations that cannot move increases, so that a larger force is required to make the dislocations overcome the obstacles and move.

[0011] The heat treatment temperature is 550-640 DEG C, and the holding time is 7-10 h; by matching the heating temperature and the holding time, the grains in the material are refined and homogenized, so that the mechanical properties and plastic deformation ability of the material are improved.

[0012] The heat treatment is carried out by using a bell-type annealing furnace, so that the aging annealing plays a greater role.

[0013] The second cold rolling processing rate ranges from 20% to 25%; a smaller cold rolling power is used, and the elongation rate is effectively maintained without a large decrease in the conductivity index.

[0014] The production process uses the effect of matching heat treatment and deformation strengthening, and in the case of reducing the processes of first cold rolling, first heat treatment and first cleaning and without decreasing the hardness and strength of the material, the plasticity of the material is improved, the material can still maintain good mechanical properties under a larger deformation, the elongation rate of the material reaches 10-15%, and the high elongation performance of C19210 for the field of solar photovoltaics is realized.

[0015] The C19210 copper strip for the field of solar photovoltaics produced by using the technical scheme has a tensile strength of 350-400 Mpa and an elongation A 11.3The elongation A is 10-15%, the Vickers hardness is 115HV-125HV, and the electrical conductivity is above 86% IACS. The surface of the copper strip is observed under a 40 times body microscope, and the surface texture is uniform. After electroplating, the microstructure is observed under a microscope, and the microstructure quality is good, meeting the quality requirements for use in the solar photovoltaic field.

[0016] Compared with the prior production technology, the C19210 copper strip produced by the present application has the advantages that the elongation A 11.3 reaches 10-15%, the electrical conductivity reaches above 86% IACS, and on the basis of meeting the high performance requirements, the production process is shortened, the production efficiency is improved, and the purpose of reducing cost and increasing efficiency is achieved. DETAILED DESCRIPTION

[0017] The present application will be further described in detail below in combination with examples.

[0018] Example 1

[0019] A short process preparation method of a C19210 high-performance copper strip for the solar photovoltaic field comprises the following steps: ingot casting, heating, hot rolling and online quenching, offline milling, first cold rolling, edge treatment, heat treatment, cleaning, second cold rolling, cleaning, flatness straightening, slitting, and finished product packaging. Among them:

[0020] (1) the smelting and casting temperature is 1130℃;

[0021] (2) the heating temperature is 930℃;

[0022] (3) the online quenching temperature is 560℃;

[0023] (4) the offline milling is milling treatment on the upper and lower surfaces and the two edge portions;

[0024] (5) the first cold rolling processing rate range is 86%;

[0025] (6) the heat treatment temperature is 550℃, and the holding time is 7h;

[0026] (7) the heat treatment is carried out by using a cover annealing furnace;

[0027] (8) the second cold rolling processing rate range is 20%;

[0028] The C19210 copper strip produced by using the technical scheme has a tensile strength of 350Mpa, an elongation A 11.3 of 15%, a Vickers hardness of 125HV, and an electrical conductivity of above 86.7% IACS. The surface of the copper strip is observed under a 40 times body microscope, and the surface texture is uniform. After electroplating, the microstructure is observed under a microscope, and the microstructure quality is good, meeting the quality requirements for use in the solar photovoltaic field.

[0029] Example 2

[0030] A short process preparation method of C19210 high-performance copper strip for solar photovoltaic field, comprising the following steps: ingot semi-continuous casting, heating, hot rolling and online quenching, offline milling, first cold rolling, edge treatment, heat treatment, cleaning, second cold rolling, cleaning, flat straightening, striping, finished product packaging. Among them:

[0031] (1) the smelting and casting temperature is 1140℃;

[0032] (2) the heating temperature is 939℃;

[0033] (3) the online quenching temperature is 610℃;

[0034] (4) the offline milling is milling surface treatment on the upper and lower surfaces and two edge parts;

[0035] (5) the first cold rolling processing rate is 92%;

[0036] (6) the heat treatment temperature is 640℃, and the holding time is 10h;

[0037] (7) the heat treatment is carried out by using a cover annealing furnace;

[0038] (8) the second cold rolling processing rate is 25%.

[0039] The C19210 copper strip for solar photovoltaic field produced by the technical scheme has a tensile strength of 400Mpa, an elongation A 11.3 of 10%, a Vickers hardness of 115HV, and an electrical conductivity of 87.3%IACS or more. Under 40 times body microscope, the surface of the copper strip is observed to be uniform in surface texture; after electroplating, the microscopic quality is good under the microscope, meeting the quality requirements for use in the solar photovoltaic field.

[0040] Example 3

[0041] A short process preparation method of C19210 high-performance copper strip for solar photovoltaic field, comprising the following steps: ingot semi-continuous casting, heating, hot rolling and online quenching, offline milling, first cold rolling, edge treatment, heat treatment, cleaning, second cold rolling, cleaning, flat straightening, striping, finished product packaging. Among them:

[0042] (1) the smelting and casting temperature is 1150℃;

[0043] (2) the heating temperature is 950℃;

[0044] (3) the online quenching temperature is 590℃;

[0045] (4) Off-line milling is for milling of the upper and lower surfaces and two edges;

[0046] (5) The first cold rolling processing rate range is 89%;

[0047] (6) Heat treatment temperature is 590℃, holding time is 9h;

[0048] (7) Heat treatment is carried out in a bell-type annealing furnace;

[0049] (8) The second cold rolling processing rate range is 23%.

[0050] The C19210 copper strip for solar photovoltaic field produced by this technical solution has a tensile strength of 376Mpa and an elongation after fracture of A 11.3 The copper strip has a 13% surface roughness, a Vickers hardness of 119 HV, and a conductivity of 86.9% IACS or higher. Observation of the copper strip surface under a 40x microscope reveals uniform surface texture. After electroplating, observation under a microscope reveals excellent microscopic quality, meeting the quality requirements for use in the solar photovoltaic field.

Claims

1. A short process for the production of C19210 high performance copper strip for the solar photovoltaic field, comprising the following steps: Ingot semi-continuous casting, heating, hot rolling and on-line quenching, off-line milling, first cold rolling, edge treatment, heat treatment, cleaning, second cold rolling, cleaning, flatness straightening, slitting, finished product packaging; characterized in that: Smelting casting temperature 1130-1150 ℃; Heating temperature 930-950 ℃; On-line quenching temperature 560-610 ℃; Off-line milling is to mill the upper and lower surfaces and the two edge parts; The first cold rolling processing rate is 86%-92%; Heat treatment temperature is 550-640 ℃, and the holding time is 7-10 h; The second cold rolling processing rate is 20%-25%.

2. A short process for the production of C19210 high performance copper strip for solar photovoltaic applications according to claim 1, characterized by: Heat treatment is carried out by using a cover annealing furnace.