阅读说明：本技术 一种高强度钛铜带材及其制备方法 (High-strength titanium copper strip and preparation method thereof ) 是由 吴春鹤 沈晓东 于 2021-09-26 设计创作，主要内容包括：本发明适用于钛铜带材技术领域,提供了一种高强度钛铜带材及其制备方法,本技术方案钛铜中钛浓度优选的：3.0％质量左右；第三元素优先选择Fe、Mg、Mn,且浓度不超过0.5％质量,其余由铜及不可避免的杂质构成,使结晶粒微细化,这样制作处的带材即提高强度的同时又兼顾弯曲性能。本技术方案从加工工艺改进,首先用真空炉将电解铜50Kg熔化,将第三元素以表1所示的配合比例分别添加后充分搅拌最后加一定比例的Ti,在氩气保护下倒入模具制造钢锭,钢锭在电阻炉中以900℃加热3小时的均质化处理后热轧,得到10mm的板材,反复的中间轧制到所需的试验样品,通过冷轧变形量、退火温度/速度、时效处理温度/时间的调整在特性改善方面有所进步。(The invention is suitable for the technical field of titanium copper strips, and provides a high-strength titanium copper strip and a preparation method thereof, wherein the titanium concentration in the titanium copper is preferred: about 3.0% by mass; the third element is preferably Fe, Mg or Mn, and has a concentration of not more than 0.5% by mass, and the balance is copper and unavoidable impurities, so that the crystal grains are refined, and the strength of the produced strip is improved while the bending performance is considered. The technical scheme is improved from the processing technology, firstly 50Kg of electrolytic copper is melted by a vacuum furnace, third elements are respectively added according to the matching proportion shown in table 1, then Ti with a certain proportion is fully stirred, finally the mixture is poured into a mould under the protection of argon to manufacture steel ingots, the steel ingots are heated in a resistance furnace for 3 hours at 900 ℃ for homogenization treatment and then are hot-rolled to obtain 10mm plates, the required test samples are repeatedly rolled in the middle, and the improvement of the characteristics is realized through the adjustment of cold rolling deformation, annealing temperature/speed and aging treatment temperature/time.)

1. A high-strength titanium copper strip is characterized in that: contains 2.0-3.5% by mass of Ti, one or more of the third elements Fe, Co, Ni, Si, Cr, P, Mg and Mn, and the balance of Cu and inevitable impurities, and is effective in refining crystal grains.

2. A high strength titanium copper strip according to claim 1 wherein: the titanium concentration is preferably: about 3.0% by mass.

3. A high strength titanium copper strip according to claim 1 wherein: the third element is preferably Fe, Mg, Mn, and has a concentration of not more than 0.5% by mass.

4. The method for preparing the high-strength titanium copper strip according to any one of claims 1 to 3, which is characterized by comprising the following steps of: the method comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace for fully homogenizing at high temperature, and carrying out hot rolling after preserving heat for a period of time to obtain a strip material;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip;

step five: aging treatment:

after cold rolling, the strip is kept at low temperature for a period of time.

5. The method of claim 4, wherein the step of preparing a high strength titanium copper strip comprises: in the first step: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: selecting one or more than one third element, adding the third elements into a vacuum furnace according to corresponding proportion, and fully stirring;

step S3: after the third element is fully melted, adding a certain proportion of titanium and mixing to form mixed liquid;

step S4: and pouring the mixed liquid into a corresponding mold under the protection of argon to manufacture a steel ingot.

6. The method of claim 4, wherein the step of preparing a high strength titanium copper strip comprises: in the third step: the steel ingot is put into a resistance furnace and is fully homogenized at the temperature of 800-900 ℃, and hot rolling is carried out after heat preservation for more than 3 hours to obtain a strip with the thickness of about 10 mm.

7. The method of claim 4, wherein the step of preparing a high strength titanium copper strip comprises: in step four: in cold rolling, the intermediate rolling reduction is 50% to 70%, preferably 50%.

8. The method of claim 4, wherein the step of preparing a high strength titanium copper strip comprises: in the fifth step: the strip is kept at a low temperature of 400 ℃ to 500 ℃ for 12 hours.

Technical Field

The invention belongs to the technical field of titanium copper strips, and particularly relates to a high-strength titanium copper strip and a preparation method thereof.

Background

In recent years, electronic devices such as portable terminals have been increasingly downsized, and smaller components thereof are required to have higher strength and better bending performance.

Titanium copper belongs to age hardening type alloy, and the strength is improved by adjusting the metallographic structure of the alloy through low-temperature aging treatment, but the characteristics of strength opposite to bending workability limit the development and the use of the alloy.

Disclosure of Invention

The invention provides a high-strength titanium copper strip and a preparation method thereof, and aims to solve the problems of the background technology.

The present invention has been accomplished in this way, and a high-strength titanium-copper strip which comprises titanium Ti in an amount of 2.0 to 3.5% by mass, one or more of the third elements Fe, Co, Ni, Si, Cr, P, Mg and Mn, and the balance of copper and unavoidable impurities, and which is capable of making crystal grains finer.

Preferably, the titanium concentration is preferably: about 3.0% by mass.

Preferably, the third element is selected from Fe, Mg and Mn, and the concentration is not more than 0.5% by mass.

A preparation method of a high-strength titanium copper strip comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace for fully homogenizing at high temperature, and carrying out hot rolling after preserving heat for a period of time to obtain a strip material;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip;

step five: aging treatment:

after cold rolling, the strip is kept at low temperature for a period of time.

Preferably, in the step one: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: selecting one or more than one third element, adding the third elements into a vacuum furnace according to corresponding proportion, and fully stirring;

step S3: after the third element is fully melted, adding a certain proportion of titanium and mixing to form mixed liquid;

step S4: and pouring the mixed liquid into a corresponding mold under the protection of argon to manufacture a steel ingot.

Preferably, in step three: the steel ingot is put into a resistance furnace and is fully homogenized at the temperature of 800-900 ℃, and hot rolling is carried out after heat preservation for more than 3 hours to obtain a strip with the thickness of about 10 mm.

Preferably, in step four: in cold rolling, the intermediate rolling reduction is 50% to 70%, preferably 50%.

Preferably, in step five: the strip is kept at a low temperature of 400 ℃ to 500 ℃ for 12 hours.

Compared with the prior art, the invention has the beneficial effects that: the invention relates to a high-strength titanium copper strip and a preparation method thereof,

1. in the technical scheme, the titanium copper contains 2.0-3.5 mass percent of titanium, more than one of third elements of Fe, Co, Ni, Si, Cr, P, Mg and Mn is added, and the balance is composed of copper and inevitable impurities, so that crystal grains are refined, wherein: the titanium concentration is preferably: about 3.0% by mass; the third element preferentially selects Fe, Mg and Mn, and the concentration of the third element is not more than 0.5 percent by mass, so that the manufactured strip not only improves the strength, but also gives consideration to the bending property.

2. The technical scheme is improved from the processing technology, and the improvement of the characteristics is made through the adjustment of cold rolling deformation, annealing temperature/speed and aging treatment temperature/time on the basis of the sequence of steel ingot smelting, surface cleaning, homogenization treatment/hot rolling, annealing, surface oxide layer cleaning, cold rolling repetition and aging treatment; specifically, the method comprises the following steps: 50Kg of electrolytic copper is melted by a vacuum furnace, the third element is added according to the mixing proportion shown in the table 1, the third element is fully stirred, Ti with a certain proportion is added, the mixture is poured into a mold under the protection of argon to manufacture steel ingots, the steel ingots are heated in a resistance furnace for 3 hours for homogenization treatment and then are hot-rolled to obtain 10mm plates, and the required test samples are repeatedly rolled in the middle.

Drawings

FIG. 1 is a first comparative schematic of a plurality of test samples according to the present invention;

FIG. 2 is a comparative schematic illustration of a plurality of test samples according to the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-2, the present invention provides a technical solution:

a high-strength titanium-copper strip comprising 2.0 to 3.5 mass% of titanium Ti, one or more of the third elements Fe, Co, Ni, Si, Cr, P, Mg and Mn, and the balance of copper and inevitable impurities, wherein the grains are refined. To improve the strength and to give consideration to the bending property.

The titanium concentration is preferably: about 3.0% by mass. If the titanium concentration is less than 2.5%, precipitates become insufficient and a desired strength cannot be obtained, but the transverse bending property in the strip rolling direction is good; if the Ti concentration exceeds 3.5%, the workability is poor, and the steel sheet is liable to be cracked or broken during rolling, and the preferred Ti concentration is about 3.0% in consideration of the strength and bending properties.

The third element is preferably Fe, Mg, Mn, and has a concentration of not more than 0.5% by mass.

Manufacturing method of high-strength titanium copper strip

Firstly, steel ingot smelting: the method is carried out in a vacuum smelting furnace, and because the high-melting-point third element needs to be added and then the power is increased to fully stir and keep for a certain time, the Ti has a low melting point and is easy to dissolve in copper, and therefore the Ti is added after the third element is completely melted to manufacture the steel ingot.

Secondly, surface cleaning: in order to obtain ideal surface quality and avoid abnormalities such as peeling, holes, color difference and the like, the surface of the steel ingot needs to be cleaned by a milling machine and a planer.

③ homogenization treatment/hot rolling: because segregation is generated during steel ingot solidification and crystal particles are different in size, the steel ingot needs to be fully homogenized at the temperature of 800-900 ℃ before hot rolling, and the heat preservation time is more than 3 hours, so that a strip with the thickness of about 10mm is obtained.

Annealing, cleaning a surface oxide layer and cold rolling: the reduction of the intermediate rolling affects the properties of the final strip, and the higher the reduction, the higher the strength but the poorer the bending properties, and the too small, the desired strength cannot be obtained, so that the reduction is preferably used in the range of 50 to 70%. Since the final cold rolling improves the dislocation density and improves the strength, but the crystal grains are coarse and uneven and have poor bending and electrical conductivity, the reduction amount is preferably 50%.

Aging treatment: the strength is further improved and the bending performance and the electric conductivity are improved by carrying out the aging treatment at the low temperature of 400-500 ℃ for 12 hours.

Referring to fig. 1 and 2, fig. 2 is a table of performance of each of the examples of fig. 1.

The first embodiment is as follows:

ti is selected to be 3.0 percent by mass, the third element is selected to be 0.3 percent by mass Fe, the reduction is 50 percent, and the aging treatment condition is 12 hours at 410 ℃.

A preparation method of a high-strength titanium copper strip comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

in the first step: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: adding 0.3% of Fe by mass into a vacuum furnace, and fully stirring;

step S3: after Fe is fully melted, adding 3.0 mass percent of titanium and mixing to form mixed liquid;

step S4: pouring the mixed liquid into a corresponding mould under the protection of argon to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace, fully homogenizing at the temperature of 800-900 ℃, preserving heat for more than 3 hours, and then carrying out hot rolling to obtain a strip with the thickness of about 10 mm;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip; wherein the intermediate rolling reduction is 50%;

step five: aging treatment:

after cold rolling, the strip was held at a low temperature of 410 ℃ for 12 hours.

Obtaining: tensile strength of 1080(N/mm 2); yield strength of 920(N/mm 2); elongation 8.1 (%); conductivity 12.2 (% IACS); the hardness was 310 (HV).

Example two:

ti is selected to be 3.0 percent by mass, the third element is selected to be 0.3 percent by mass Fe, the reduction is 70 percent, and the aging treatment condition is 12 hours at 410 ℃.

A preparation method of a high-strength titanium copper strip comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

in the first step: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: adding 0.3% of Fe by mass into a vacuum furnace, and fully stirring;

step S3: after Fe is fully melted, adding 3.0 mass percent of titanium and mixing to form mixed liquid;

step S4: pouring the mixed liquid into a corresponding mould under the protection of argon to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace, fully homogenizing at the temperature of 800-900 ℃, preserving heat for more than 3 hours, and then carrying out hot rolling to obtain a strip with the thickness of about 10 mm;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip; wherein the intermediate rolling reduction is 70%;

step five: aging treatment:

after cold rolling, the strip was held at a low temperature of 410 ℃ for 12 hours.

Obtaining: tensile strength 1120(N/mm 2); yield strength of 960(N/mm 2); elongation 4.1 (%); conductivity 13.1 (% IACS); the hardness was 328 (HV).

Example three:

3.0 mass% of Ti, 0.3 mass% of Fe and 0.1 mass% of Mg as a third element, 50% of reduction amount and aging treatment at 410 ℃ for 12 hours are selected.

A preparation method of a high-strength titanium copper strip comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

in the first step: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: adding 0.3% by mass of Fe and 0.1% by mass of Mg into a vacuum furnace, and fully stirring;

step S3: after Fe and Mg are fully melted, adding 3.0 mass percent of titanium and mixing to form mixed liquid;

step S4: pouring the mixed liquid into a corresponding mould under the protection of argon to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace, fully homogenizing at the temperature of 800-900 ℃, preserving heat for more than 3 hours, and then carrying out hot rolling to obtain a strip with the thickness of about 10 mm;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip; wherein the intermediate rolling reduction is 50%;

step five: aging treatment:

after cold rolling, the strip was held at a low temperature of 410 ℃ for 12 hours.

Obtaining: tensile strength 1050(N/mm 2); yield strength of 905(N/mm 2); elongation 9.6 (%); conductivity 10.8 (% IACS); the hardness was 315 (HV).

Example four:

3.0 mass% of Ti, 0.3 mass% of Fe and 0.1 mass% of Mg as a third element, 70% of reduction and aging treatment at 410 ℃ for 12 hours are selected.

A preparation method of a high-strength titanium copper strip comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

in the first step: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: adding 0.3% by mass of Fe and 0.1% by mass of Mg into a vacuum furnace, and fully stirring;

step S3: after Fe and Mg are fully melted, adding 3.0 mass percent of titanium and mixing to form mixed liquid;

step S4: pouring the mixed liquid into a corresponding mould under the protection of argon to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace, fully homogenizing at the temperature of 800-900 ℃, preserving heat for more than 3 hours, and then carrying out hot rolling to obtain a strip with the thickness of about 10 mm;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip; wherein the intermediate rolling reduction is 70%;

step five: aging treatment:

after cold rolling, the strip was held at a low temperature of 410 ℃ for 12 hours.

Obtaining: tensile strength of 1140(N/mm 2); yield strength of 980(N/mm 2); elongation 3.7 (%); conductivity 11.6 (% IACS); the hardness was 331 (HV).

Example five:

3.0 mass% of Ti, 0.3 mass% of Fe and 0.1 mass% of Mn as a third element, a reduction of 50% and aging treatment at 410 ℃ for 12 hours were selected.

A preparation method of a high-strength titanium copper strip comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

in the first step: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: adding 0.3% by mass of Fe and 0.1% by mass of Mn into a vacuum furnace, and fully stirring;

step S3: after Fe and Mn are fully melted, adding 3.0 mass percent of titanium and mixing to form mixed liquid;

step S4: pouring the mixed liquid into a corresponding mould under the protection of argon to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace, fully homogenizing at the temperature of 800-900 ℃, preserving heat for more than 3 hours, and then carrying out hot rolling to obtain a strip with the thickness of about 10 mm;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip; wherein the intermediate rolling reduction is 50%;

step five: aging treatment:

after cold rolling, the strip was held at a low temperature of 410 ℃ for 12 hours.

Obtaining: tensile strength 1060(N/mm 2); a yield strength of 925(N/mm 2); elongation 9.5 (%); conductivity 12.6 (% IACS); the hardness was 306 (HV).

Example six:

3.0 mass% of Ti, 0.3 mass% of Fe and 0.1 mass% of Mn as a third element, 70% of reduction and aging treatment at 410 ℃ for 12 hours are selected.

A preparation method of a high-strength titanium copper strip comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

in the first step: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: adding 0.3% by mass of Fe and 0.1% by mass of Mn into a vacuum furnace, and fully stirring;

step S3: after Fe and Mn are fully melted, adding 3.0 mass percent of titanium and mixing to form mixed liquid;

step S4: pouring the mixed liquid into a corresponding mould under the protection of argon to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace, fully homogenizing at the temperature of 800-900 ℃, preserving heat for more than 3 hours, and then carrying out hot rolling to obtain a strip with the thickness of about 10 mm;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip; wherein the intermediate rolling reduction is 70%;

step five: aging treatment:

after cold rolling, the strip was held at a low temperature of 410 ℃ for 12 hours.

Obtaining: tensile strength 1100(N/mm 2); yield strength of 995(N/mm 2); elongation 3.8 (%); conductivity 12.1 (% IACS); the hardness was 326 (HV).

Example seven:

ti is selected to be 3.0 mass%, the third element is selected to be 0.3 mass% Fe, 0.1 mass% Mg and 0.1 mass% Mn, the reduction is 50%, and the aging treatment condition is 12 hours at 410 ℃.

A preparation method of a high-strength titanium copper strip comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

in the first step: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: adding 0.3% by mass of Fe, 0.1% by mass of Mg and 0.1% by mass of Mn into a vacuum furnace, and fully stirring;

step S3: after Fe, Mg and Mn are fully melted, adding 3.0 mass percent of titanium and mixing to form mixed liquid;

step S4: pouring the mixed liquid into a corresponding mould under the protection of argon to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace, fully homogenizing at the temperature of 800-900 ℃, preserving heat for more than 3 hours, and then carrying out hot rolling to obtain a strip with the thickness of about 10 mm;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip; wherein the intermediate rolling reduction is 50%;

step five: aging treatment:

after cold rolling, the strip was held at a low temperature of 410 ℃ for 12 hours.

Obtaining: tensile strength 1090(N/mm 2); yield strength of 960(N/mm 2); elongation 10.6 (%); conductivity 10.9 (% IACS); the hardness was 322 (HV).

Example eight:

ti is selected to be 3.0 mass%, the third element is selected to be 0.3 mass% Fe, 0.1 mass% Mg and 0.1 mass% Mn, the reduction is 70%, and the aging treatment condition is 12 hours at 410 ℃.

A preparation method of a high-strength titanium copper strip comprises the following steps:

the method comprises the following steps: steel ingot smelting:

sequentially adding electrolytic copper, a third element and titanium into a vacuum furnace, melting, mixing and pouring the mixture into a mold to manufacture a steel ingot;

in the first step: the method specifically comprises the following steps:

step S1: adding 50Kg of electrolytic copper into a vacuum furnace, and melting the electrolytic copper;

step S2: adding 0.3% by mass of Fe, 0.1% by mass of Mg and 0.1% by mass of Mn into a vacuum furnace, and fully stirring;

step S3: after Fe, Mg and Mn are fully melted, adding 3.0 mass percent of titanium and mixing to form mixed liquid;

step S4: pouring the mixed liquid into a corresponding mould under the protection of argon to manufacture a steel ingot;

step two: surface cleaning:

cleaning the surface of the steel ingot by a milling machine and a planer;

step three: homogenization treatment/hot rolling:

firstly, putting the steel ingot with the cleaned surface into a resistance furnace, fully homogenizing at the temperature of 800-900 ℃, preserving heat for more than 3 hours, and then carrying out hot rolling to obtain a strip with the thickness of about 10 mm;

step four: and (3) repeating annealing, surface oxide layer cleaning and cold rolling:

annealing the strip, cleaning an oxide layer on the surface of the strip, and finally cold rolling the strip; wherein the intermediate rolling reduction is 70%;

step five: aging treatment:

after cold rolling, the strip was held at a low temperature of 410 ℃ for 12 hours.

Obtaining: tensile strength of 1150 (N/mm)²) (ii) a The yield strength is 950 (N/mm)²) (ii) a Elongation 6.2 (%); conductivity 11.2 (% IACS); the hardness was 339 (HV).

In summary, the following steps: the first, third and fifth invention examples have smaller final rolling reduction, lower strength, and better bending/elongation properties, while the second, fourth, sixth and eighth invention examples have the opposite, and finally the seventh invention example has the crystal grains micronized by properly adding the third element, controls the reduction, improves the strength, and simultaneously considers the bending properties.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.