CN109280802B - A kind of high-performance high-strength copper strip and production method thereof - Google Patents

Abstract

A kind of high performance high strength copper strips of the invention, the chemical component containing following weight percent: Mg:0.02-0.04%, Ni:0.01-0.02%, Si:0.01-0.02%, Sm:0.002-0.004%, remaining is Cu.High performance high strength copper strips of the invention and its production method; gained copper strips has high resiliency and high conductivity; and bending and molding performance and stress relaxation-resistant excellent; production method is simple; production is direct plungeed into using existing equipment; production cost is low, easily accomplishes scale production, and has good industrial prospect.

Description

A kind of high-performance high-strength copper strip and production method thereof

technical field

The invention relates to the field of copper strip preparation, in particular to a high-performance and high-strength copper strip and a production method thereof.

Background technique

Copper strip is the most widely used and the cheapest product in copper products. Many copper strips require relatively high hardness and mechanical properties. The surface hardness of brass must reach HV170-190, or even exceed 190. This hardness is already two. The limit of element alloy brass, due to the large processing rate, has the consequence that the shape of the copper strip is difficult to control, and side bending occurs after shearing, which affects the use of customers. The traditional method of changing the hardness of copper strip is to increase the processing rate by rolling. This method is easy to increase the probability of copper surface defects during processing, and due to the processing limit of copper itself, rolling will damage to a certain extent. The copper tape guide material is scrapped.

Application No. 201611026982.7 discloses a production formula of copper strip and its preparation method, including the following steps: batching, melting and casting, rolling, annealing, pickling, finishing, finished product packaging and transportation, and the ingredients contain lead, iron and iron. , tin, nickel, copper, phosphorus, zinc, and lead content ≤ 0.01%, iron content ≤ 0.02%, tin content ≤ 0.02%, nickel content ≤ 0.02%, phosphorus content 0.001-0.003%, copper content 63.0-64.5 %, and the balance is zinc. Application No. 201510725538.3 discloses a brass strip and a preparation method thereof. The brass strip contains the following elements by weight: Cu 68-72%; Sn≤0.06%; P≤0.001%; Ni≤0.002%; Pb≤0.002 %; Fe≤0.002%; Al≤0.002%; the balance is Zn. Preferred are: Cu 69.68%; Sn 0.054%; P 0.0004%; Ni 0.0012%; Pb 0.0014%; Fe 0.0019%; Al 0.0011%; Zn 30.26%. The above-mentioned preparation of the copper strip uses a large amount of raw materials, resulting in high production cost, and the obtained copper strip has low elasticity and electrical conductivity.

SUMMARY OF THE INVENTION

In view of this, the object of the present invention is to provide a high-performance high-strength copper strip and a production method thereof, the obtained copper strip has high elasticity and high electrical conductivity, and is excellent in bending formability and stress relaxation resistance, and the production method is simple, The existing equipment can be directly put into production, the production cost is low, the large-scale production is easy to be realized, and there is a good industrial prospect.

In order to achieve the above object, the present invention provides the following technical solutions:

A high-performance high-strength copper strip contains the following chemical components by weight: Mg: 0.02-0.04%, Ni: 0.01-0.02%, Si: 0.01-0.02%, Sm: 0.002-0.004%, and the rest are Cu.

Preferably, it contains the following chemical components by weight: Mg: 0.02%, Ni: 0.01%, Si: 0.02%, Sm: 0.004%, and the rest is Cu.

A production method of high-performance high-strength copper strip, comprising the following steps:

(1) Casting: get the raw materials according to the component formula and add them to the melting furnace twice to obtain alloy ingots, and the casting temperature is 1550 ℃-1600 ℃;

(2) hot rolling: the alloy billet obtained in step (1) is subjected to hot rolling to obtain a hot rolled billet;

(3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min;

(4) cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a thick copper strip;

(5) rolling: the crude copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements and is subjected to rolling and annealing treatment;

(6) The refined copper strip obtained in step (5) is subjected to stretching, bending and straightening treatment and longitudinal shearing finishing treatment in sequence, and the copper strip is obtained after completion.

Preferably, in the described step (1), the raw materials are added to the furnace in two times, specifically:

(11) Add Cu and Ni first, and keep the temperature for 1h after Cu and Ni are melted;

(12) After the holding time is over, add Mg, Si and Sm, and continue to melt to obtain an alloy ingot.

Preferably, the hot rolling treatment in the step (2) is specifically: heating at 950°C-980°C with a holding time of 2h; natural cooling for 1h, and then hot rolling with water cooling, with a final rolling temperature of 600°C-700°C °C.

Preferably, the cold rolling annealing treatment in the step (4) is specifically: including a preheating section, a low temperature heating section, a constant temperature and heat preservation section, a high temperature heating section and a cooling section in sequence;

Preheating section: preheat at 200-300℃ for 1h;

Low temperature heating section: heating at 300-450℃ for 0.5h, the heating rate is 300℃/h;

Constant temperature insulation section: keep at 450℃ for 2-3h;

High temperature heating section: heat up to 650°C at a heating rate of 100°C/h, and heat at 650°C for 0.5h;

Cooling section: natural cooling for 4-5 hours, air cooling for 2-3 hours, and water cooling until the temperature of the blister copper strip is less than 60℃.

Preferably, the rolling annealing treatment in the step (5) is specifically: including accelerated rolling annealing, uniform rolling annealing and deceleration rolling annealing in sequence;

Accelerated rolling and annealing: the temperature is 650±5℃, the annealing speed is 25-35.5m/min, and the acceleration efficiency of the annealing rate is 1m/min. -90 ℃ drying to obtain first-class refined copper strip;

Uniform speed rolling and annealing: The first-grade refined copper strip obtained after accelerated rolling and annealing treatment is subjected to uniform speed rolling and annealing, the temperature is 650±5℃, and the annealing speed is 20m/min. Cleaning treatment, drying at 80-90℃ after cleaning to obtain secondary refined copper tape;

Deceleration rolling and annealing: The secondary refined copper strip obtained after uniform rolling and annealing is subjected to deceleration rolling and annealing, the temperature is 650±5℃, the annealing speed is 15-20m/min, and the deceleration rate of the annealing rate is 0.5m /min, after deceleration rolling and annealing treatment, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90 ℃ to obtain refined copper strip.

Preferably, the pickling solution includes 100-200ml/L of hydrochloric acid, 5-6g/L of citric acid, 4-5g/L of sorbic acid and 75% ethanol solution;

Weigh the hydrochloric acid, citric acid and sorbic acid of the above formula in turn, add them to 1 L of ethanol solution with a volume fraction of 75%, and stir to obtain the pickling solution.

According to the above technical solution, it can be known that, in the present invention, Cu and Ni are added first, and then Mg, Ni, Si, and Sm are added, so that the copper-nickel alloy can be infinitely dissolved, and the nickel element has the dual effects of grain refinement and solid solution strengthening. It is beneficial to improve the mechanical properties of the alloy while changing the morphology of the α phase, thereby significantly improving the strength, hardness, thermal stability and corrosion resistance of the copper strip. Rare earth element samarium Sm can purify the melt, improve the density and fluidity of the melt, help to eliminate the loose structure defects of casting, inhibit the eutectoid decomposition of β phase and form continuous chain-like coarse γ ₂ particles, and improve the quality of the melt , Sm is solid-dissolved in Mg and Si and then solid-dissolved in copper-nickel alloys. On the one hand, it can play a role in solid solution strengthening, on the other hand, it can also play a role in deoxidation and improving melt fluidity. The formed grain boundaries and grains penetrate dislocations, effectively hinder the movement of dislocations, improve the stress relaxation resistance of the copper tape and inhibit recrystallization, thereby improving the elasticity of the material.

The preparation method of the low-alloyed copper strip of the invention has simple steps, adopts multi-stage cold rolling annealing treatment and rolling annealing treatment to eliminate the as-cast structure, and after the cold rolling treatment of the casting billet, the large grains and the dendrite structure are rolled Through the multi-stage and gentle annealing treatment, the orientation of the texture structure is gradually eliminated under the condition of ensuring a certain strength, avoiding the performance of the copper strip. The rolling direction is oriented, so that the solid solution phase has better transverse and longitudinal properties, and the grain size of the texture structure becomes smaller and smaller with the repeated treatment of rolling and annealing, thereby improving the mechanical properties of the product and ensuring The quality of the product, the finer the grains, the more the number of dislocation movement obstacles will be increased, the solid solution between the grains will be more multi-directional, the length of the dislocation clusters in the grains will be reduced, and the deformation of the solid solution phase will be reduced. Power ratio increased.

The pickling solution of the invention has high antibacterial performance and anticorrosion performance, can prevent the surface of the strip from oxidizing and does not cause air pollution.

Detailed ways

The products, methods and applications of the present invention have been described through the preferred embodiments, and relevant persons can obviously make changes or appropriate changes and combinations to the methods and applications described herein without departing from the content, spirit and scope of the present invention, to realize and apply the present invention.

The raw materials and instruments and equipment used in the technical solution can be purchased from the market, and will not be listed here.

Example 1

A high-performance and high-strength copper strip contains the following chemical components by weight: Mg: 0.02%, Ni: 0.01%, Si: 0.02%, Sm: 0.004%, and the rest is Cu.

A production method of high-performance high-strength copper strip, comprising the following steps:

(1) Melting and casting: get raw materials according to the above-mentioned component formula and add it into the melting furnace twice to obtain alloy ingots, and the casting temperature is 1550 ℃-1600 ℃;

The raw materials are added to the furnace in two times as follows:

(11) Add Cu and Ni first, and keep the temperature for 1h after Cu and Ni are melted;

(12) After the holding time is over, add Mg, Si and Sm, and continue to melt to obtain an alloy ingot.

(2) Hot rolling: the alloy ingot obtained in step (1) is subjected to hot rolling treatment to obtain a hot rolled billet; the hot rolling treatment is specifically: heating at 950°C-980°C for 2 hours; naturally cooling for 1 hour, and then The hot rolling is water-cooled, and the final rolling temperature is 600℃-700℃.

(3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min;

(4) Cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a thick copper strip; Hot section, low temperature heating section, constant temperature insulation section, high temperature heating section and cooling section;

Preheating section: preheat at 200-300℃ for 1h;

Low temperature heating section: heating at 300-450℃ for 0.5h, the heating rate is 300℃/h;

Constant temperature insulation section: keep at 450℃ for 2-3h;

High temperature heating section: heat up to 650°C at a heating rate of 100°C/h, and heat at 650°C for 0.5h;

Cooling section: natural cooling for 4-5 hours, air cooling for 2-3 hours, and water cooling until the temperature of the blister copper strip is less than 60℃.

(5) rolling: the crude copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements, and then rolling and annealing treatment is carried out; the rolling and annealing treatment is specifically: including accelerated rolling annealing, uniform rolling annealing and Reduced rolling and annealing;

Accelerated rolling and annealing: the temperature is 650±5℃, the annealing speed is 25-35.5m/min, and the acceleration efficiency of the annealing rate is 1m/min. -90 ℃ drying to obtain first-class refined copper strip;

Uniform speed rolling and annealing: The first-grade refined copper strip obtained after accelerated rolling and annealing treatment is subjected to uniform speed rolling and annealing, the temperature is 650±5℃, and the annealing speed is 20m/min. Cleaning treatment, drying at 80-90℃ after cleaning to obtain secondary refined copper tape;

Deceleration rolling and annealing: The secondary refined copper strip obtained after uniform rolling and annealing is subjected to deceleration rolling and annealing, the temperature is 650±5℃, the annealing speed is 15-20m/min, and the deceleration rate of the annealing rate is 0.5m /min, after deceleration rolling and annealing treatment, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90 ℃ to obtain refined copper strip.

Wherein, the pickling solution includes 100-200ml/L hydrochloric acid, 5-6g/L citric acid, 4-5g/L sorbic acid and 75% ethanol solution; Take the hydrochloric acid, citric acid and sorbic acid of the above formula, add 1 L of ethanol solution with a volume fraction of 75%, and stir to obtain the pickling solution

(6) The refined copper strip obtained in step (5) is subjected to stretching, bending and straightening treatment and longitudinal shearing finishing treatment in sequence, and the above-mentioned copper strip is obtained after completion.

Example 2

A high-performance and high-strength copper strip contains the following chemical components by weight: Mg: 0.04%, Ni: 0.01%, Si: 0.02%, Sm: 0.002%, and the rest is Cu.

A production method of high-performance high-strength copper strip, comprising the following steps:

(1) Melting and casting: get raw materials according to the above-mentioned component formula and add it into the melting furnace twice to obtain alloy ingots, and the casting temperature is 1550 ℃-1600 ℃;

The raw materials are added to the furnace in two times as follows:

(11) Add Cu and Ni first, and keep the temperature for 1h after Cu and Ni are melted;

(12) After the holding time is over, add Mg, Si and Sm, and continue to melt to obtain an alloy ingot.

(2) Hot rolling: the alloy ingot obtained in step (1) is subjected to hot rolling treatment to obtain a hot rolled billet; the hot rolling treatment is specifically: heating at 950°C-980°C for 2 hours; naturally cooling for 1 hour, and then The hot rolling is water-cooled, and the final rolling temperature is 600℃-700℃.

(3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min;

(4) Cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a thick copper strip; Hot section, low temperature heating section, constant temperature insulation section, high temperature heating section and cooling section;

Preheating section: preheat at 200-300℃ for 1h;

Low temperature heating section: heating at 300-450℃ for 0.5h, the heating rate is 300℃/h;

Constant temperature insulation section: keep at 450℃ for 2-3h;

High temperature heating section: heat up to 650°C at a heating rate of 100°C/h, and heat at 650°C for 0.5h;

Cooling section: natural cooling for 4-5 hours, air cooling for 2-3 hours, and water cooling until the temperature of the blister copper strip is less than 60℃.

(5) rolling: the crude copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements, and then rolling and annealing treatment is carried out; the rolling and annealing treatment is specifically: including accelerated rolling annealing, uniform rolling annealing and Reduced rolling and annealing;

Accelerated rolling and annealing: the temperature is 650±5℃, the annealing speed is 25-35.5m/min, and the acceleration efficiency of the annealing rate is 1m/min. -90 ℃ drying to obtain first-class refined copper strip;

Uniform speed rolling and annealing: The first-grade refined copper strip obtained after accelerated rolling and annealing treatment is subjected to uniform speed rolling and annealing, the temperature is 650±5℃, and the annealing speed is 20m/min. Cleaning treatment, drying at 80-90℃ after cleaning to obtain secondary refined copper tape;

Deceleration rolling and annealing: The secondary refined copper strip obtained after uniform rolling and annealing is subjected to deceleration rolling and annealing, the temperature is 650±5℃, the annealing speed is 15-20m/min, and the deceleration rate of the annealing rate is 0.5m /min, after deceleration rolling and annealing treatment, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90 ℃ to obtain refined copper strip.

Wherein, the pickling solution includes 100-200ml/L hydrochloric acid, 5-6g/L citric acid, 4-5g/L sorbic acid and 75% ethanol solution; Take the hydrochloric acid, citric acid and sorbic acid of the above formula, add 1 L of ethanol solution with a volume fraction of 75%, and stir to obtain the pickling solution

(6) The refined copper strip obtained in step (5) is subjected to stretching, bending and straightening treatment and longitudinal shearing finishing treatment in sequence, and the above-mentioned copper strip is obtained after completion.

Example 3

A high-performance and high-strength copper strip contains the following chemical components by weight: Mg: 0.03%, Ni: 0.015%, Si: 0.015%, Sm: 0.003%, and the rest is Cu.

A production method of high-performance high-strength copper strip, comprising the following steps:

(1) Melting and casting: get raw materials according to the above-mentioned component formula and add it into the melting furnace twice to obtain alloy ingots, and the casting temperature is 1550 ℃-1600 ℃;

The raw materials are added to the furnace in two times as follows:

(11) Add Cu and Ni first, and keep the temperature for 1h after Cu and Ni are melted;

(12) After the holding time is over, add Mg, Si and Sm, and continue to melt to obtain an alloy ingot.

(2) Hot rolling: the alloy ingot obtained in step (1) is subjected to hot rolling treatment to obtain a hot rolled billet; the hot rolling treatment is specifically: heating at 950°C-980°C for 2 hours; naturally cooling for 1 hour, and then The hot rolling is water-cooled, and the final rolling temperature is 600℃-700℃.

(3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min;

(4) Cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a thick copper strip; Hot section, low temperature heating section, constant temperature insulation section, high temperature heating section and cooling section;

Preheating section: preheat at 200-300℃ for 1h;

Low temperature heating section: heating at 300-450℃ for 0.5h, the heating rate is 300℃/h;

Constant temperature insulation section: keep at 450℃ for 2-3h;

High temperature heating section: heat up to 650°C at a heating rate of 100°C/h, and heat at 650°C for 0.5h;

Cooling section: natural cooling for 4-5 hours, air cooling for 2-3 hours, and water cooling until the temperature of the blister copper strip is less than 60℃.

(5) rolling: the crude copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements, and then rolling and annealing treatment is carried out; the rolling and annealing treatment is specifically: including accelerated rolling annealing, uniform rolling annealing and Reduced rolling and annealing;

Accelerated rolling and annealing: the temperature is 650±5℃, the annealing speed is 25-35.5m/min, and the acceleration efficiency of the annealing rate is 1m/min. -90 ℃ drying to obtain first-class refined copper strip;

Uniform speed rolling and annealing: The first-grade refined copper strip obtained after accelerated rolling and annealing treatment is subjected to uniform speed rolling and annealing, the temperature is 650±5℃, and the annealing speed is 20m/min. Cleaning treatment, drying at 80-90℃ after cleaning to obtain secondary refined copper tape;

Deceleration rolling and annealing: The second-level refined copper strip obtained after uniform rolling and annealing is subjected to deceleration rolling and annealing, the temperature is 650±5℃, the annealing speed is 15-20m/min, and the deceleration rate of the annealing rate is 0.5m /min, after deceleration rolling and annealing treatment, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90 ℃ to obtain refined copper strip.

Wherein, the pickling solution includes 100-200ml/L hydrochloric acid, 5-6g/L citric acid, 4-5g/L sorbic acid and 75% ethanol solution; Take the hydrochloric acid, citric acid and sorbic acid of the above formula, add 1 L of ethanol solution with a volume fraction of 75%, and stir to obtain the pickling solution

(6) The refined copper strip obtained in step (5) is subjected to stretching, bending and straightening treatment and longitudinal shearing finishing treatment in sequence, and the above-mentioned copper strip is obtained after completion.

Example 4

A high-performance and high-strength copper strip contains the following chemical compositions by weight: Mg: 0.04%, Ni: 0.02%, Si: 0.015%, Sm: 0.004%, and the rest is Cu.

A production method of high-performance high-strength copper strip, comprising the following steps:

(1) Melting and casting: get raw materials according to the above-mentioned component formula and add it into the melting furnace twice to obtain alloy ingots, and the casting temperature is 1550 ℃-1600 ℃;

The raw materials are added to the furnace in two times as follows:

(11) Add Cu and Ni first, and keep the temperature for 1h after Cu and Ni are melted;

(12) After the holding time is over, add Mg, Si and Sm, and continue to melt to obtain an alloy ingot.

(2) Hot rolling: the alloy ingot obtained in step (1) is subjected to hot rolling treatment to obtain a hot rolled billet; the hot rolling treatment is specifically: heating at 950°C-980°C for 2 hours; naturally cooling for 1 hour, and then The hot rolling is water-cooled, and the final rolling temperature is 600℃-700℃.

(3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min;

(4) Cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a thick copper strip; Hot section, low temperature heating section, constant temperature insulation section, high temperature heating section and cooling section;

Preheating section: preheat at 200-300℃ for 1h;

Low temperature heating section: heating at 300-450℃ for 0.5h, the heating rate is 300℃/h;

Constant temperature insulation section: keep at 450℃ for 2-3h;

High temperature heating section: heat up to 650°C at a heating rate of 100°C/h, and heat at 650°C for 0.5h;

Cooling section: natural cooling for 4-5 hours, air cooling for 2-3 hours, and water cooling until the temperature of the blister copper strip is less than 60℃.

(5) rolling: the crude copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements and then subjected to rolling and annealing treatment; the rolling and annealing treatment is specifically: including accelerated rolling annealing, uniform rolling annealing and Reduced rolling and annealing;

Accelerated rolling and annealing: the temperature is 650±5℃, the annealing speed is 25-35.5m/min, and the acceleration efficiency of the annealing rate is 1m/min. -90 ℃ drying to obtain first-class refined copper strip;

Uniform speed rolling and annealing: The first-grade refined copper strip obtained after accelerated rolling and annealing treatment is subjected to uniform speed rolling and annealing, the temperature is 650±5℃, and the annealing speed is 20m/min. Cleaning treatment, drying at 80-90℃ after cleaning to obtain secondary refined copper tape;

Deceleration rolling and annealing: The secondary refined copper strip obtained after uniform rolling and annealing is subjected to deceleration rolling and annealing, the temperature is 650±5℃, the annealing speed is 15-20m/min, and the deceleration rate of the annealing rate is 0.5m /min, after deceleration rolling and annealing treatment, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90 ℃ to obtain refined copper strip.

Wherein, the pickling solution includes 100-200ml/L of hydrochloric acid, 5-6g/L of citric acid, 4-5g/L of sorbic acid and an ethanol solution with a volume fraction of 75%; Take the hydrochloric acid, citric acid and sorbic acid of the above formula, add 1 L of ethanol solution whose volume fraction is 75%, and stir to obtain the pickling solution

(6) The refined copper strip obtained in step (5) is subjected to stretching, bending and straightening treatment and longitudinal shearing finishing treatment in sequence, and the above-mentioned copper strip is obtained after completion.

Example 5

A high-performance and high-strength copper strip contains the following chemical components by weight: Mg: 0.02%, Ni: 0.01%, Si: 0.015%, Sm: 0.0025%, and the rest is Cu.

A production method of high-performance high-strength copper strip, comprising the following steps:

(1) Melting and casting: get raw materials according to the above-mentioned component formula and add it into the melting furnace twice to obtain alloy ingots, and the casting temperature is 1550 ℃-1600 ℃;

The raw materials are added to the furnace in two times as follows:

(11) Add Cu and Ni first, and keep the temperature for 1h after Cu and Ni are melted;

(12) After the holding time is over, add Mg, Si and Sm, and continue to melt to obtain an alloy ingot.

(2) Hot rolling: the alloy ingot obtained in step (1) is subjected to hot rolling treatment to obtain a hot rolled billet; the hot rolling treatment is specifically: heating at 950°C-980°C for 2 hours; naturally cooling for 1 hour, and then The hot rolling is water-cooled, and the final rolling temperature is 600℃-700℃.

(3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min;

(4) Cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a thick copper strip; Hot section, low temperature heating section, constant temperature insulation section, high temperature heating section and cooling section;

Preheating section: preheat at 200-300℃ for 1h;

Low temperature heating section: heating at 300-450℃ for 0.5h, the heating rate is 300℃/h;

Constant temperature insulation section: keep at 450℃ for 2-3h;

High temperature heating section: heat up to 650°C at a heating rate of 100°C/h, and heat at 650°C for 0.5h;

Cooling section: natural cooling for 4-5 hours, air cooling for 2-3 hours, and water cooling until the temperature of the blister copper strip is less than 60℃.

(5) rolling: the crude copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements, and then rolling and annealing treatment is carried out; the rolling and annealing treatment is specifically: including accelerated rolling annealing, uniform rolling annealing and Reduced rolling and annealing;

Accelerated rolling and annealing: the temperature is 650±5℃, the annealing speed is 25-35.5m/min, and the acceleration efficiency of the annealing rate is 1m/min. -90 ℃ drying to obtain first-class refined copper strip;

Uniform speed rolling and annealing: The first-grade refined copper strip obtained after accelerated rolling and annealing treatment is subjected to uniform speed rolling and annealing, the temperature is 650±5℃, and the annealing speed is 20m/min. Cleaning treatment, drying at 80-90℃ after cleaning to obtain secondary refined copper tape;

Deceleration rolling and annealing: The secondary refined copper strip obtained after uniform rolling and annealing is subjected to deceleration rolling and annealing, the temperature is 650±5℃, the annealing speed is 15-20m/min, and the deceleration rate of the annealing rate is 0.5m /min, after deceleration rolling and annealing treatment, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90 ℃ to obtain refined copper strip.

Wherein, the pickling solution includes 100-200ml/L hydrochloric acid, 5-6g/L citric acid, 4-5g/L sorbic acid and 75% ethanol solution; Take the hydrochloric acid, citric acid and sorbic acid of the above formula, add 1 L of ethanol solution with a volume fraction of 75%, and stir to obtain the pickling solution

(6) The refined copper strip obtained in step (5) is subjected to stretching, bending and straightening treatment and longitudinal shearing finishing treatment in sequence, and the above-mentioned copper strip is obtained after completion.

Comparative Example 1

Comparative Example 1 is basically the same as Example 1, except that the chemical composition of the high-performance high-strength copper strip is adjusted, that is, Sm is not added to the chemical composition; that is, a high-performance high-strength copper strip contains the following weights Percent chemical composition: Mg: 0.02%, Ni: 0.01%, Si: 0.02%, and the rest is Cu.

A production method of high-performance high-strength copper strip, comprising the following steps:

(1) Melting and casting: get raw materials according to the above-mentioned component formula and add it into the melting furnace twice to obtain alloy ingots, and the casting temperature is 1550 ℃-1600 ℃;

The raw materials are added to the furnace in two times as follows:

(11) Add Cu and Ni first, and keep the temperature for 1h after Cu and Ni are melted;

(12) After the holding time is over, add Mg and Si, and continue to melt to obtain an alloy ingot.

(2) Hot rolling: the alloy ingot obtained in step (1) is subjected to hot rolling treatment to obtain a hot rolled billet; the hot rolling treatment is specifically: heating at 950°C-980°C for 2 hours; naturally cooling for 1 hour, and then The hot rolling is water-cooled, and the final rolling temperature is 600℃-700℃.

(3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min;

(4) Cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a thick copper strip; Hot section, low temperature heating section, constant temperature insulation section, high temperature heating section and cooling section;

Preheating section: preheat at 200-300℃ for 1h;

Low temperature heating section: heating at 300-450℃ for 0.5h, the heating rate is 300℃/h;

Constant temperature insulation section: keep at 450℃ for 2-3h;

High temperature heating section: heat up to 650°C at a heating rate of 100°C/h, and heat at 650°C for 0.5h;

Cooling section: natural cooling for 4-5 hours, air cooling for 2-3 hours, and water cooling until the temperature of the blister copper strip is less than 60℃.

(5) rolling: the crude copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements, and then rolling and annealing treatment is carried out; the rolling and annealing treatment is specifically: including accelerated rolling annealing, uniform rolling annealing and Reduced rolling and annealing;

Accelerated rolling and annealing: the temperature is 650±5℃, the annealing speed is 25-35.5m/min, and the acceleration efficiency of the annealing rate is 1m/min. -90 ℃ drying to obtain first-class refined copper strip;

Uniform speed rolling and annealing: The first-grade refined copper strip obtained after accelerated rolling and annealing treatment is subjected to uniform speed rolling and annealing, the temperature is 650±5℃, and the annealing speed is 20m/min. Cleaning treatment, drying at 80-90℃ after cleaning to obtain secondary refined copper tape;

Deceleration rolling and annealing: The secondary refined copper strip obtained after uniform rolling and annealing is subjected to deceleration rolling and annealing, the temperature is 650±5℃, the annealing speed is 15-20m/min, and the deceleration rate of the annealing rate is 0.5m /min, after deceleration rolling and annealing treatment, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90 ℃ to obtain refined copper strip.

Wherein, the pickling solution includes 100-200ml/L hydrochloric acid, 5-6g/L citric acid, 4-5g/L sorbic acid and 75% ethanol solution; Take the hydrochloric acid, citric acid and sorbic acid of the above formula, add 1 L of ethanol solution with a volume fraction of 75%, and stir to obtain the pickling solution

(6) The refined copper strip obtained in step (5) is subjected to stretching, bending and straightening treatment and longitudinal shearing finishing treatment in sequence, and the above-mentioned copper strip is obtained after completion.

Comparative Example 2

Comparative Example 2 is basically the same as Example 1, except that the production method of high-performance high-strength copper strip is adjusted, and the chemical composition remains unchanged, that is, a production method of high-performance and high-strength copper strip includes the following steps :

(1) Melting and casting: get raw materials according to the above-mentioned component formula and add it into the melting furnace twice to obtain alloy ingots, and the casting temperature is 1550 ℃-1600 ℃;

The raw materials are added to the furnace in two times as follows:

(11) Add Cu and Ni first, and keep the temperature for 1h after Cu and Ni are melted;

(12) After the holding time is over, add Mg, Si and Sm, and continue to melt to obtain an alloy ingot.

(2) Hot rolling: the alloy ingot obtained in step (1) is subjected to hot rolling treatment to obtain a hot rolled billet; the hot rolling treatment is specifically: heating at 950°C-980°C for 2 hours; naturally cooling for 1 hour, and then The hot rolling is water-cooled, and the final rolling temperature is 600℃-700℃.

(3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min;

(4) Cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a thick copper strip; the cold rolling and annealing treatment is specifically: at 450° C. -650℃, heat for 3h, then cool down naturally for 4-5h, air-cool for 2-3h, and then water-cool until the temperature of the blister copper strip is less than 60℃.

(5) Rolling: the crude copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements and then rolled and annealed; the specific rolling and annealing treatment is: the temperature is 650±5°C, and the annealing speed is 25- 35.5m/min, after annealing, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90℃ to obtain refined copper strip;

Wherein, the pickling solution includes 100-200ml/L hydrochloric acid, 5-6g/L citric acid, 4-5g/L sorbic acid and 75% ethanol solution; Take the hydrochloric acid, citric acid and sorbic acid of the above formula, add 1 L of ethanol solution with a volume fraction of 75%, and stir to obtain the pickling solution

(6) The refined copper strip obtained in step (5) is subjected to stretching, bending and straightening treatment and longitudinal shearing finishing treatment in sequence, and the above-mentioned copper strip is obtained after completion.

Comparative Example 3

Comparative Example 3 is basically the same as Example 1, the difference is that the production method of high-performance high-strength copper strip is adjusted, and the chemical composition remains unchanged, that is, a production method of high-performance high-strength copper strip, comprising the following steps:

(1) melting and casting: according to the above-mentioned component formula, the raw materials are added into the furnace for melting and casting to obtain an alloy ingot, and the casting temperature is 1550 ℃-1600 ℃;

(2) Hot rolling: the alloy ingot obtained in step (1) is subjected to hot rolling treatment to obtain a hot rolled billet; the hot rolling treatment is specifically: heating at 950°C-980°C for 2 hours; naturally cooling for 1 hour, and then The hot rolling is water-cooled, and the final rolling temperature is 600℃-700℃.

(3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min;

(4) Cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a thick copper strip; Hot section, low temperature heating section, constant temperature insulation section, high temperature heating section and cooling section;

Preheating section: preheat at 200-300℃ for 1h;

Low temperature heating section: heating at 300-450℃ for 0.5h, the heating rate is 300℃/h;

Constant temperature insulation section: keep at 450℃ for 2-3h;

High temperature heating section: heat up to 650°C at a heating rate of 100°C/h, and heat at 650°C for 0.5h;

Cooling section: natural cooling for 4-5 hours, air cooling for 2-3 hours, and water cooling until the temperature of the blister copper strip is less than 60℃.

(5) rolling: the crude copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements, and then rolling and annealing treatment is carried out; the rolling and annealing treatment is specifically: including accelerated rolling annealing, uniform rolling annealing and Reduced rolling and annealing;

Accelerated rolling and annealing: the temperature is 650±5℃, the annealing speed is 25-35.5m/min, and the acceleration efficiency of the annealing rate is 1m/min. -90 ℃ drying to obtain first-class refined copper strip;

Uniform speed rolling and annealing: The first-grade refined copper strip obtained after accelerated rolling and annealing treatment is subjected to uniform speed rolling and annealing, the temperature is 650±5℃, and the annealing speed is 20m/min. Cleaning treatment, drying at 80-90℃ after cleaning to obtain secondary refined copper tape;

Deceleration rolling and annealing: The secondary refined copper strip obtained after uniform rolling and annealing is subjected to deceleration rolling and annealing, the temperature is 650±5℃, the annealing speed is 15-20m/min, and the deceleration rate of the annealing rate is 0.5m /min, after deceleration rolling and annealing treatment, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90 ℃ to obtain refined copper strip.

Wherein, the pickling solution includes 100-200ml/L hydrochloric acid, 5-6g/L citric acid, 4-5g/L sorbic acid and 75% ethanol solution; Take the hydrochloric acid, citric acid and sorbic acid of the above formula, add 1 L of ethanol solution with a volume fraction of 75%, and stir to obtain the pickling solution

(6) The refined copper strip obtained in step (5) is subjected to stretching, bending and straightening treatment and longitudinal shearing finishing treatment in sequence, and the above-mentioned copper strip is obtained after completion.

The test parameters of the physical properties of the copper strips prepared in Examples 1-5 and Comparative Examples 1-3 are listed in Table 1:.

Table 1 compares the main parameters of copper strips

As can be seen from Table 1, the performance of the copper strips of Comparative Examples 1-3 is far inferior to the mechanical properties of the copper strips obtained in Examples 1-5. Improvement and improvement, so as to obtain products that are superior to existing products, the high-performance and high-strength copper strip of the present invention has a simple production method, can be directly put into production by using existing equipment, has low production cost, and is easy to achieve large-scale production. Good industrial prospects, the obtained copper tape has high elasticity and high electrical conductivity, and is excellent in bending formability and stress relaxation resistance.

The descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (3)

1. A method for producing a high-performance high-strength copper strip, wherein the high-performance high-strength copper strip has the following chemical compositions by weight: Mg: 0.02%, Ni: 0.01%, Si: 0.02%, Sm: 0.004%, and the rest is Cu; It is characterized in that, comprises the following steps: (1) Melting and casting: take the raw materials according to the composition formula and add them into the furnace twice to obtain alloy ingots, and the casting temperature is 1550℃-1600℃; (2) Hot rolling: subjecting the alloy ingot obtained in step (1) to hot rolling to obtain a hot rolled billet; (3) Milling surface: the hot-rolled billet obtained in step (2) is subjected to milling surface treatment to obtain a milling surface plate, the milling amount is 0.5mm-1.0mm on one side, and the milling speed is less than 4.5m/min; (4) Cold rolling: cold rolling and cold rolling annealing are performed on the milled panel obtained in step (3), and the total deformation is 50%-70% to obtain a crude copper strip; (5) Rolling: The blister copper strip obtained in step (4) is made into a refined copper strip that meets the size requirements and then rolled and annealed; (6) The refined copper strip obtained in step (5) is subjected to stretch-bending straightening treatment and longitudinal shearing finishing treatment in sequence, and the copper strip is obtained after completion; Wherein, in the step (1), the raw materials are added to the furnace in two times as follows: (11) Add Cu and Ni first, and keep the temperature for 1h after Cu and Ni are melted; (12) After the holding time is over, add Mg, Si and Sm, and continue to melt to obtain an alloy ingot; The cold rolling and annealing treatment in the step (4) is specifically: including a preheating section, a low temperature heating section, a constant temperature and heat preservation section, a high temperature heating section and a cooling section in sequence; Preheating section: preheat at 200-300℃ for 1h; Low temperature heating section: heating at 300-450℃ for 0.5h, the heating rate is 300℃/h; Constant temperature insulation section: keep at 450℃ for 2-3h; High temperature heating section: heat up to 650°C at a heating rate of 100°C/h, and heat at 650°C for 0.5h; Cooling section: natural cooling for 4-5 hours, air cooling for 2-3 hours, and water cooling until the temperature of the blister copper strip is less than 60℃; The rolling annealing treatment in the step (5) is specifically: including accelerated rolling annealing, uniform rolling annealing and deceleration rolling annealing in sequence; Accelerated rolling and annealing: the temperature is 650±5℃, the annealing speed is 25-35.5m/min, and the acceleration efficiency of the annealing rate is 1m/min. -90 ℃ drying to obtain first-class refined copper strip; Uniform speed rolling and annealing: the first-grade refined copper strip obtained after accelerated rolling and annealing treatment is subjected to uniform speed rolling and annealing, the temperature is 650±5℃, and the annealing speed is 20m/min. Cleaning treatment, drying at 80-90℃ after cleaning to obtain secondary refined copper tape; Deceleration rolling and annealing: The second-level refined copper strip obtained after uniform rolling and annealing is subjected to deceleration rolling and annealing, the temperature is 650±5℃, the annealing speed is 15-20m/min, and the deceleration rate of the annealing rate is 0.5m /min, after deceleration rolling and annealing treatment, it is cleaned with pickling solution, and after cleaning, it is dried at 80-90 ℃ to obtain refined copper strip. 2 . The method for producing a high-performance and high-strength copper strip according to claim 1 , wherein the hot rolling treatment in the step (2) is specifically: heating at 950°C-980°C, and the holding time is 2. 2 . 2h; natural cooling for 1h, then hot rolling with water cooling, the final rolling temperature is 600℃-700℃. 3. the production method of high-performance high-strength copper strip as claimed in claim 1 is characterized in that, described pickling solution comprises the hydrochloric acid of 100-200ml/L, the citric acid of 5-6g/L, the citric acid of 4-5g/L sorbic acid and 75% ethanol solution; Weigh the hydrochloric acid, citric acid and sorbic acid of the above formula in turn, add them to 1 L of ethanol solution whose volume fraction is 75%, and stir to obtain the pickling solution.