CN102061406B - A kind of highly elastic copper-nickel-manganese alloy and preparation method thereof - Google Patents

Abstract

The invention discloses a novel high-elasticity Cu-Ni-Mn alloy which comprises the following components in percent by weight: 15-20 percent of Ni, 15-20 percent of Mn, 0.1 percent of Ti, 0.5-1 percent of Al, 0.05 percent of P, 0-0.1 percent of Re and the balance of Cu, wherein the weight percent sum of all the components is 100 percent. The invention also discloses a preparation method of the high-elasticity Cu-Ni-Mn alloy, which is simpler, is capable of reducing the preparation cost of the alloy, and solves the problems of a mass of pores and defects and the like inside a cast ingot because the Cu-Ni-Mn alloy is extremely easy to absorb gas during smelting and casting, and a key problem that the cast ingot is easy to crack during the rolling to cause the subsequent processing not to be favorably carried out. The alloy is suitable for making various elastic elements, contact springs, switches, contacts and the like in industries of instruments, electrical appliances and the like.

Description

A kind of highly elastic copper-nickel-manganese alloy and preparation method thereof

technical field

The invention designs a white copper alloy material and a preparation method thereof, in particular to a novel elastic alloy material with copper as a matrix and nickel, manganese, aluminum, titanium, phosphorus and rare earth as main alloy elements and a preparation method thereof. the

Background technique

Elastic alloy is a very important type of alloy in functional materials, and it is also an indispensable material in precision instruments and precision machinery. This type of alloy is widely used in the manufacture of various elastic connecting elements, such as pressure elastic contact pieces, heat-sensitive bimetallic elastic elements, conductive elastic connectors for relays, and various elastic elements used in aviation instruments. Their function is to produce force or moment, store energy, buffer vibration, serve as elastic connection and isolation medium, etc. the

Elastic alloys can be divided into: spring steel (including carbon steel and alloy steel, such as 65 steel and 65Mn), iron-based elastic alloys (such as Fe-Cr-Ni series and Fe-Cr-Ni-Co series), nickel-based elastic alloys (such as the famous nickel-beryllium alloy), cobalt-based elastic alloys (such as Co40NiCrMo), copper-based elastic alloys (such as beryllium bronze, tin phosphor bronze and copper-nickel-manganese alloys, etc.), niobium-based elastic alloys (such as Ni-Cr-Co series high-temperature high-elasticity alloys), etc. Copper-based elastic alloys have excellent physical, chemical, and mechanical properties, and play an important role in high-strength, high-conductivity, and high-elasticity alloys. the

At present, the most famous alloys such as beryllium bronze and titanium bronze among the commonly used copper-based elastic alloys are alloying elements whose solubility decreases significantly with the decrease of temperature in copper, and supersaturated solid solution is formed by high temperature treatment, and then in the aging process The supersaturated solid solution is decomposed and separated, and the alloy elements are distributed in the matrix in the form of precipitated phases. These alloys belong to precipitation-strengthened elastic alloys; most of the alloys such as aluminum brass, zinc white copper, aluminum bronze, and tin bronze are single Phase α solid solution does not produce phase change, and can only be strengthened by cold deformation and subsequent low-temperature heat treatment. The alloy belongs to the deformation-strengthened elastic alloy. Among the copper-based precipitation-strengthened elastic alloys, beryllium bronze is the only high-elastic and high-strength alloy. However, the production cost of beryllium bronze alloy is high, and its dust is toxic, and its compounds are even more toxic. Beryllium compounds are harmful to the human body, and production personnel should not work at higher temperatures for a long time. Therefore, in recent years, with the continuous enhancement of human awareness of environmental protection, new elastic alloys with excellent performance and more harmonious with the environment have been looking for at home and abroad. the

In copper-nickel-manganese alloys, the MnNi compound formed by manganese and nickel has the effect of refining grains, and can improve the mechanical properties and processing properties of the alloy by means of the precipitation hardening of MnNi. After manganese is added to the copper-nickel alloy, the resistance value is stable, the temperature coefficient of resistance is small, and it has good electrical conductivity. It is a famous electrical alloy. Studies have shown that copper-nickel-manganese alloy is a new type of elastic alloy that can be strengthened by heat treatment and has the potential of high strength, high elasticity and excellent electrical conductivity. the

However, during the high-temperature melting and casting process of copper-nickel-manganese alloy, it is very easy to absorb gas, resulting in a large number of defects such as pores, inclusions, and porosity inside the ingot. . Chinese patent application (application number: 200910309818) about the preparation method of copper-nickel-manganese-iron alloy is to make various alloys into powder, utilize vacuum high-temperature sintering, carry out solid solution aging to obtain alloy body after being cooled to room temperature with furnace, this method needs The raw material is made into powder, the preparation method is complex and demanding, the production efficiency is low, and the cost is high. The alloy billet produced by this method is small and single in shape, which is not conducive to further processing and industrialization. Simple solution aging of the ingot without further plastic processing cannot give full play to the performance of the alloy, and the application of the product is very limited. the

Contents of the invention

A new type of copper-nickel-manganese elastic alloy. According to the weight percentage, the alloying elements contained in the copper-nickel-manganese elastic alloy are: 15%-20% nickel, 15%-20% manganese and trace elements titanium, aluminum, phosphorus and Rare earth, the contents of the trace elements are: titanium: 0.1%, aluminum: 0.1% to 1%, phosphorus: 0.05%, rare earth: 0% to 0.1%; the sum of the weight percentages of each component in the alloy is 100% , the balance is copper and a small amount of impurities. the

Further, the weight percentage of elements nickel Ni and manganese Mn in the alloy is 1:1. the

Further, the color of the copper-nickel-manganese elastic alloy is bright white, the tensile strength _σb : 965-1200MPa; the elongation δ: 1.5-4%; the hardness 300-374Hv; the elastic modulus E: 136-153GPa high strength and high A new type of copper-nickel-manganese alloy with excellent elastic properties.

The preparation method of above-mentioned novel copper-nickel-manganese elastic alloy, concrete process flow is:

a. Dosing, feeding and smelting according to weight percentage;

b. Milling;

c. Homogenization annealing;

d. Hot rolling;

e. Solution treatment;

f. cold rough rolling;

g. Intermediate annealing;

h. Cold finish rolling;

i. Aging treatment. the

Further, the feeding and smelting sequence described in step a is: 1. Copper+nickel; 2. After the copper and nickel are melted, add manganese+aluminum, wherein the manganese should be wrapped with copper and put into the furnace; 3. Add copper and titanium intermediate Alloy and copper-phosphorus master alloy and copper rare earth master alloy; used for grain refinement and impurity removal; melting temperature: 1150-1300°C; casting temperature: 1200°C±20°C. the

Further, the melt is covered with a 10-15 mm thick charcoal layer after each feeding in the smelting process, and fine graphite scales are evenly sprinkled on the charcoal layer to completely cover the gaps left by the charcoal layer. the

Further, the temperature of the homogenizing annealing and hot rolling is 800-900° C., and the heating time is 2-10 hours; in the intermediate annealing process, the annealing temperature is 600-750° C., and the heating time is 2-5 hours. the

Further, in the solution treatment step, the solution temperature is 600-800° C., the holding time is 2-8 hours, and the cooling method is water cooling. the

Further, in the aging treatment process, the aging temperature is 400-500° C., the time is 8-20 hours, and the cooling method is air cooling or furnace cooling. the

Further, the total processing rate of cold rolling between the two annealings is 50-80%, and the total processing rate of finished cold rolling is 40-60%. the

Compared with the prior art, the advantage of the present invention is that the novel copper-nickel-manganese elastic alloy has good performance in terms of strength, hardness and processing performance, and also has good comprehensive performance. Moreover, the preparation process of the alloy is relatively simple, the process flow is short, and by covering charcoal and graphite when the metal is molten and adding alloy metals during the smelting process, the extremely easy gas absorption during the smelting and casting process is solved, resulting in a large amount of gas in the ingot. The problem of porosity; by adding alloy metals during the smelting process, controlling the order and method of adding various alloy metals, and using a specific annealing process in the process of pressure processing to avoid the generation of brittle phases during the solidification and phase transformation of the ingot , so it solves the problem that the alloy ingot is easy to crack in the process of pressure processing, which is not conducive to subsequent processing. This type of alloy is widely used in the manufacture of various elastic components. It is a very good high-strength, high-conductivity, high-elasticity copper-based alloy. Because it does not contain any elements harmful to the environment and human body, and has excellent comprehensive properties, It is an excellent substitute for traditional elastic alloys such as beryllium bronze. the

Detailed ways

The present invention will be described in further detail below by way of examples. the

Example 1

The alloy of the invention is smelted with the following raw materials: electrolytic copper, electrolytic nickel, manganese sheet, copper-10% cerium master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy and pure aluminum. The composition of the alloy is shown in Table 1. the

Copper-nickel-manganese elastic alloy composition example (weight %) in the embodiment 1 of table 1

alloy element Ni Mn Al Ce Ti P Cu content 15 15 0.2 0.02 0.1 0.05 Surplus

Preparation:

1. Melting: Melting is carried out in an intermediate frequency induction furnace. The order of adding the alloy is: put the electrolytic copper and electrolytic nickel into the smelting furnace, completely cover the surface of the melt with a charcoal layer of 10-15mm, and then sprinkle evenly on the charcoal layer with fine graphite scales, the purpose is to make the charcoal layer The left gap is completely covered, and then the melting furnace is covered with graphite plates; rapid heating and melting are carried out according to the melting process; after all the raw materials in the furnace are melted, aluminum flakes and manganese flakes wrapped with copper are added, and melted with charcoal and graphite flakes Body covering, the covering method and covering thickness used are the same as before; after the manganese sheet is completely melted, add copper-10% cerium master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy, and then use charcoal, graphite The scales cover the melt, and the graphite plate covers the melting furnace. The covering method and covering thickness used are the same as before; stirring and heat preservation for 5 to 10 minutes; taking out of the furnace, removing slag, and casting to obtain the alloy ingot. Alloy melting temperature 1150～1300℃, casting temperature 1200±20℃;

2. Milling: Milling the scale and casting defects on the surface of the ingot. the

3. Homogenization annealing: heating to 850°C in a heating furnace, and homogenization and heat preservation for 3 hours. the

4. Hot rolling: 63% of the alloy billet is deformed by hot rolling. the

5. Solution treatment: heat the hot-rolled alloy to 750°C for 3 hours, then water-cool. the

6. Cold rough rolling: 80% cold deformation treatment is carried out on the solution treated alloy. the

7. Intermediate annealing: put the cold-rolled alloy into a heat treatment annealing furnace, and keep it at 700°C for 2 hours to fully eliminate the cold-rolled work hardening. the

8. Cold finish rolling: the alloy is subjected to 52% cold finish rolling deformation treatment. the

9. Aging: Put the cold-rolled alloy into a heat treatment annealing furnace, keep it at 450°C for 8 hours, and cool with the furnace. the

Example 2

The alloy of the present invention adopts the following raw materials for smelting: electrolytic copper, electrolytic nickel, manganese sheet, copper-10% lanthanum master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy and pure aluminum. The composition of the alloy is shown in Table 2. the

Copper-nickel-manganese elastic alloy composition example (weight %) in the embodiment 2 of table 2

alloy element Ni Mn Al La Ti P Cu content 15 15 0.2 0.02 0.1 0.05 Surplus

Preparation:

1. Melting: Melting is carried out in an intermediate frequency induction furnace. The order of adding the alloy is: put the electrolytic copper and electrolytic nickel into the smelting furnace, cover with a 10-15mm charcoal layer, and then spread evenly on the charcoal layer with fine graphite flakes, the purpose is to cover the gap left by the charcoal layer, Then cover the smelting furnace with a graphite plate; perform rapid heating and smelting according to the smelting process; after all the raw materials in the furnace are melted, add aluminum flakes and manganese flakes wrapped with copper, and cover the melt with charcoal and graphite flakes. The covering thickness is the same as before; after the manganese flakes are completely melted, add copper-10% lanthanum master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy, and then cover the melt with charcoal and graphite flakes. The method and covering thickness are the same as before; the graphite plate covers the smelting furnace; stirring, keeping warm for 5-10 minutes; taking out of the furnace, removing slag, and casting to obtain the alloy ingot. The alloy melting temperature is 1150-1300°C, and the casting temperature is 1200±20°C. the

2. Milling: Milling the scale and casting defects on the surface of the ingot. the

3. Homogenization annealing: heating to 800°C in a heating furnace, and homogenization and heat preservation for 4 hours. the

4. Hot rolling: 65% of the alloy billet is deformed by hot rolling. the

5. Solution treatment: heat the hot-rolled alloy to 700°C for 2 hours, then water-cool. the

6. Cold rough rolling: 70% cold deformation treatment is performed on the solution-treated alloy. the

7. Intermediate annealing: put the cold-rolled alloy into a heat treatment annealing furnace, and keep it at 650°C for 3 hours to fully eliminate the cold-rolled work hardening. the

8. Cold finish rolling: subject the alloy to 50% cold finish rolling deformation treatment. the

9. Aging: Put the cold-rolled alloy into a heat treatment annealing furnace, keep it at 450°C for 10 hours, and cool with the furnace. the

Example 3

The alloy of the present invention adopts the following raw materials for smelting: electrolytic copper, electrolytic nickel, manganese sheet, copper-10% lanthanum master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy and pure aluminum. The composition of the alloy is shown in Table 3. the

Copper-nickel-manganese elastic alloy composition example in the embodiment 3 of table 3

alloy element Ni Mn Al La Ti P Cu Content (weight%) 15 15 0.2 0.04 0.1 0.05 Surplus

Preparation:

1. Melting: Melting is carried out in an intermediate frequency induction furnace. The order of adding the alloy is: put the electrolytic copper and electrolytic nickel into the smelting furnace, cover it with a charcoal layer of 10-15mm, and then sprinkle evenly on the charcoal layer with fine graphite scales, the purpose is to cover the gap left by the charcoal layer, Then cover the smelting furnace with a graphite plate; perform rapid heating and smelting according to the smelting process; after all the raw materials in the furnace are melted, add aluminum flakes and manganese flakes wrapped with copper, and cover the melt with charcoal and graphite flakes. The covering thickness is the same as before; after the manganese flakes are completely melted, add copper-10% lanthanum master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy, and then cover the melt with charcoal and graphite flakes. The method and covering thickness are the same as before; the graphite plate covers the smelting furnace; stirring, keeping warm for 5-10 minutes; taking out of the furnace, removing slag, and casting to obtain the alloy ingot. The alloy melting temperature is 1150-1300°C, and the casting temperature is 1200±20°C. the

2. Milling: Milling the scale and casting defects on the surface of the ingot. the

3. Homogenization annealing: heating to 900°C in a heating furnace, and homogenization and heat preservation for 5 hours. the

4. Hot rolling: the cast ingot undergoes 60% deformation after face milling, homogenization and heat preservation treatment. the

5. Solid solution: heat the hot-rolled alloy to 750°C for 3 hours, then water-cool. the

6. Cold rolling: 75% cold deformation treatment is performed on the solution treated alloy. the

7. Intermediate annealing: put the cold-rolled alloy into a heat treatment annealing furnace, and keep it at 750°C for 3 hours to fully eliminate the cold-rolled work hardening. the

8. Cold finish rolling: subject the alloy to 60% cold finish rolling deformation treatment. the

9. Aging: Put the cold-rolled alloy into a heat treatment annealing furnace, keep it at 500°C for 8 hours, and cool with the furnace. the

Example 4

The alloy of the invention is smelted with the following raw materials: electrolytic copper, electrolytic nickel, manganese sheet, copper-10% iridium master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy and pure aluminum. The composition of the alloy is shown in Table 4. the

Copper-nickel-manganese elastic alloy composition example in the embodiment 4 of table 4

alloy element Ni Mn Al Y Ti P Cu Content (weight%) 15 15 0.2 0.04 0.1 0.05 Surplus

Preparation:

1. Melting: Melting is carried out in an intermediate frequency induction furnace. The order of adding the alloy is: put the electrolytic copper and electrolytic nickel into the smelting furnace, cover with a 10-15mm charcoal layer, and then spread evenly on the charcoal layer with fine graphite flakes, the purpose is to cover the gap left by the charcoal layer, Then cover the smelting furnace with a graphite plate; perform rapid heating and smelting according to the smelting process; after all the raw materials in the furnace are melted, add aluminum flakes and manganese flakes wrapped with copper, and cover the melt with charcoal and graphite flakes. The covering thickness is the same as before; after the manganese sheet is completely melted, add copper-10% iridium master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy, and then cover the melt with charcoal and graphite flakes, the covering The method and covering thickness are the same as before; the graphite plate covers the smelting furnace; stirring, keeping warm for 5-10 minutes; taking out of the furnace, removing slag, and casting to obtain the alloy ingot. The alloy melting temperature is 1150-1300°C, and the casting temperature is 1200±20°C. the

2. Milling: Milling the scale and casting defects on the surface of the ingot. the

3. Homogenization annealing: heating to 900°C in a heating furnace, and homogenization and heat preservation for 3 hours. the

4. Hot rolling: After the ingot is milled, it is homogenized and then deformed by 65%. the

5. Solid solution: heat the hot-rolled alloy to 750°C for 5 hours, then water-cool. the

6. Cold rolling: 80% cold deformation treatment is performed on the solution treated alloy. the

7. Intermediate annealing: put the cold-rolled alloy into a heat treatment annealing furnace, and keep it at 600°C for 5 hours to fully eliminate the cold-rolled work hardening. the

8. Cold finish rolling: the alloy is subjected to 58% cold finish rolling deformation treatment. the

9. Aging: Put the cold-rolled alloy into a heat treatment annealing furnace, keep it at 400°C for 12 hours, and cool with the furnace. the

Example 5

The alloy of the present invention is smelted using the following raw materials: electrolytic copper, electrolytic nickel, manganese sheet, copper-10% iridium master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy, and pure aluminum. The composition of the alloy is shown in Table 5. the

Copper-nickel-manganese elastic alloy composition example (weight %) among the table 5 embodiment 5

alloy element Ni Mn Al Y Ti P Cu content 15 15 0.2 0.06 0.1 0.05 Surplus

Preparation:

1. Melting: Melting is carried out in an intermediate frequency induction furnace. The order of adding the alloy is: put the electrolytic copper and electrolytic nickel into the smelting furnace, cover with a 10-15mm charcoal layer, and then spread evenly on the charcoal layer with fine graphite flakes, the purpose is to cover the gap left by the charcoal layer, Then cover the smelting furnace with a graphite plate; perform rapid heating and smelting according to the smelting process; after all the raw materials in the furnace are melted, add aluminum flakes and manganese flakes wrapped with copper, and cover the melt with charcoal and graphite flakes. The covering thickness is the same as before; after the manganese sheet is completely melted, add copper-10% iridium master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy, and then cover the melt with charcoal and graphite flakes, the covering The method and covering thickness are the same as before; the graphite plate covers the smelting furnace; stirring, keeping warm for 5-10 minutes; taking out of the furnace, removing slag, and casting to obtain the alloy ingot. The alloy melting temperature is 1150-1300°C, and the casting temperature is 1200±20°C. the

2. Milling: Milling the scale and casting defects on the surface of the ingot. the

3. Homogenization annealing: heating to 850°C in a heating furnace, and homogenization and heat preservation for 3 hours. the

4. Hot rolling: After the ingot is milled and homogenized, it is deformed by 65%. the

5. Solid solution: heat the hot-rolled alloy to 800°C for 2 hours, and then water-cool it. the

6. Cold rolling: 75% cold deformation treatment is performed on the solution treated alloy. the

7. Intermediate annealing: put the cold-rolled alloy into a heat treatment annealing furnace, and keep it at 700°C for 3 hours to fully eliminate the cold-rolled work hardening. the

8. Cold finish rolling: the alloy is subjected to 55% cold finish rolling deformation treatment. the

9. Aging: Put the cold-rolled alloy into a heat treatment annealing furnace, keep it at 500°C for 12 hours, and cool with the furnace. the

Example 6

The alloy of the invention is smelted with the following raw materials: electrolytic copper, electrolytic nickel, manganese sheet, copper-10% cerium master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy and pure aluminum. The composition of the alloy is shown in Table 6. the

Copper-nickel-manganese elastic alloy composition example in the embodiment 6 of table 6

alloy element Ni Mn Al Ce Ti P Cu content 15 15 0.2 0.06 0.1 0.05 Surplus

Preparation:

1. Melting: Melting is carried out in an intermediate frequency induction furnace. The order of adding the alloy is: put the electrolytic copper and electrolytic nickel into the smelting furnace, cover with a charcoal layer of 10-15mm, and then spread evenly on the charcoal layer with fine graphite scales, the purpose is to completely cover the gap left by the charcoal layer , and then cover the smelting furnace with a graphite plate; perform rapid heating and smelting according to the smelting process; after all the raw materials in the furnace are melted, add aluminum flakes and manganese flakes wrapped with copper, and completely cover the melt with charcoal and graphite flakes. The method and covering thickness are the same as before; after the manganese sheet is completely melted, add copper-10% cerium master alloy, copper-10% phosphorus master alloy, copper-20% titanium master alloy, and then cover the melt with charcoal and graphite flakes, use The covering method and covering thickness are the same as before; the graphite plate covers the smelting furnace; it is stirred and kept for 5-10 minutes; The alloy melting temperature is 1150-1300°C, and the casting temperature is 1200±20°C. the

2. Milling: Milling the scale and casting defects on the surface of the ingot. the

3. Homogenization annealing: heating to 850°C in a heating furnace, and homogenization and heat preservation for 5 hours. the

4. Hot rolling: After the ingot is milled and homogenized, it is deformed by 65%. the

5. Solid solution: heat the hot-rolled alloy to 750°C for 3 hours, then water-cool. the

6. Cold rolling: 80% cold deformation treatment is performed on the solution treated alloy. the

7. Intermediate annealing: put the cold-rolled alloy into a heat treatment annealing furnace, and keep it at 750°C for 2 hours to fully eliminate the cold-rolled work hardening. the

8. Cold finish rolling: the alloy is subjected to 56% cold finish rolling deformation treatment. the

9. Aging: Put the cold-rolled alloy into a heat treatment annealing furnace, keep it at 450°C for 16 hours, and cool with the furnace. the

Tables 7, 8, and 9 respectively represent the main properties of the inventive copper-nickel-manganese alloy and the comparative alloy, the comparative alloy composition (weight %) and the copper-nickel-manganese alloy composition (weight %) of the present invention, representing the present invention in an intuitive manner The content and properties of each alloy in the copper-nickel-manganese alloy. the

Table 7 Main properties of copper-nickel-manganese alloys of the present invention and comparison alloys

Alloy Elastic modulus (GPa) Tensile strength (MPa) Elongation (%) Hardness (Hv) Comparative Alloy QBe ₂ 122～137 1125～1175 ≥1.5 320～360 Copper Nickel Manganese Alloy 136～153 965～1200 1.5～4 300～374

Table 8 contrast alloy composition (weight %)

alloy element Ni Al Si Fe be Cu Alloy content 0.2-0.5 0.15 0.15 0.15 1.8-2.1 Surplus

Table 9 Composition of copper-nickel-manganese alloy of the present invention (weight %)

alloy element Ni Mn Al Re Ti P Cu Alloy content 15-20 15-20 0.5-1.0 0-0.1 0-0.1 0.05 Surplus

Claims (1)

1. the preparation method of a copper nickel manganese elastic alloy is characterized by, and the alloy preparation technology flow process is as follows:

A. according to weight percent Ni:15%～20%, Mn:15%～20%, Ti:0.1%, Al:0.1%～1%, P:0.05%, rare earth Re:0%～0.1%, surplus is Cu and a small amount of impurity, and the weight percent sum of each component is 100% to prepare burden, feed intake and melting; The described melting that feeds intake sequentially is: 1. copper and mickel; 2. after copper, nickel fusing, add manganese and aluminium, wherein manganese will entrain into stove with copper-clad; 3. come out of the stove front adding copper titanium master alloy and copper phosphorus master alloy and copper rare earth intermediate alloy are used for crystal grain thinning and removal of impurities; Smelting temperature is: 1150～1300 ℃; Pouring temperature is 1200 ℃ ± 20 ℃, and the rear melt that at every turn feeds intake in the described fusion process all covers with the thick charcoal layer of 10～15mm, and evenly is sprinkling upon on the charcoal layer with tiny graphite scale, covers the slit that charcoal layer stays fully;

B. mill face;

C. homogenizing annealing, the temperature of described homogenizing annealing is: 800～900 ℃, be heat-up time: 2～10h;

D. hot rolling, hot-rolled temperature are 800-900 ℃;

E. solution treatment, solid solubility temperature is: 600～800 ℃, soaking time is: 2～8h, the type of cooling is water-cooled;

F. cold roughing, general working rate is: 50～80%;

G. process annealing, annealing temperature is: 600～750 ℃, the time is: 2～5h;

H. cold finish rolling, general working rate is: 40～60%;

I. ageing treatment, aging temp is: 400～500 ℃, the time is: 8～20h, the type of cooling is air cooling or furnace cooling.