CN102925746B - High-performance Cu-Ni-Si system copper alloy, and preparation method and processing method thereof - Google Patents
High-performance Cu-Ni-Si system copper alloy, and preparation method and processing method thereof Download PDFInfo
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Abstract
The invention relates to a high-performance Cu-Ni-Si system copper alloy, and a preparation method and a processing method thereof, belonging to the field of nonferrous metal processing. The high-performance Cu-Ni-Si system copper alloy comprises the following components by weight percent: 2.2%-4.2% of Ni, 0.25%-1.2% of Si, 0.05%-0.3% of Mg, and the balance of Cu, wherein (a) the content of Ni/Si is more than or equal to 4 and less than or equal to 6; and (b) the content of the impurity is less than or equal to 0.5%. The tensile strength Sigma b of the copper alloy is 730-820MPa, the plastic percentage elongation delta of the copper alloy is 8-10%, the conductivity of the copper alloy is 40-50% IACS (international annealed copper standard), and the mean grain size of a cast blank is 100-150mum. The copper alloy can be widely applicable to occasions such as elastic reeds, electric contacts, spot welding poles, anti-explosion tools, electrical contact components, the plug-in component blanks.
Description
Technical field
The present invention relates to a kind of high-performance Cu-Ni-Si series copper alloy and preparation and fabrication method thereof, belong to non-ferrous metals processing field.
Background technology
Along with the needs of living standards of the people raising day by day, development of modern industry and national defense construction, high-performance copper alloy material range of application is increasingly extensive, and demand continues to increase.The good characteristic such as high-performance copper alloy material has that intensity is high, good springiness, antifatigue, elastic lag are little, corrosion-resistant, be widely used in electronics, aerospace, instrument, instrument and automatically control in industry, for the manufacture of various elastic springs, electrical contact, spot welding limit, explosion-proof instrument etc., and because its stable performance, long service life are widely used in the particular component in the important military project such as Aeronautics and Astronautics, weapons, boats and ships, radar system department, be mainly and electrically contact components and parts, patch components and parts and relay device etc.In the industries such as computer, high-grade household electrical appliance, explosion-proof instrument, chemical industry, coal, also there is its huge potential market.
C7025 is Cu-Ni-Si series copper alloy, and this alloy has excellent over-all properties, and its tensile strength is 750 ~ 850MPa, and specific conductivity is 35 ~ 45%IACS.Domestic still under test for C7025, and in order to adapt to the demand of domestic present industry for material, the present invention is studied and develops Cu-Ni-Si series copper alloy and less energy-consumption preparation and fabrication method thereof on the basis of C7025 alloy.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of high performance Cu-Ni-Si series copper alloy is provided, its performance can substitute or surmount C7025 alloy.
For achieving the above object, the present invention takes following technical scheme:
A kind of high-performance Cu-Ni-Si series copper alloy, according to weight percent, its basic ingredient comprises: Ni 2.2%～4.2%, Si 0.25%～1.2%, Mg 0.05%～0.3%, all the other are Cu, the composition in described copper alloy need to meet: (a) 4≤Ni/Si≤6; (b) impurity content≤0.5%.
A kind of preferred version, according to weight percent, comprises Ni 2.4%～3.0%, Si 0.4%～0.75%, and Mg0.1%～0.2%, all the other are Cu, the composition in described copper alloy need to meet: (a) 4≤Ni/Si≤6; (b) impurity content≤0.5%.
Further, element below adding in described copper alloy: be selected from one or both in boron (B), vanadium (V), and one or more in manganese (Mn), zirconium (Zr) and titanium (Ti), its weight percent content is boron (B): 0.01 ~ 0.02%, vanadium (V): 0.01 ~ 0.02%, manganese (Mn): 0.001 ~ 0.01%, zirconium (Zr): 0.001 ~ 0.01%, titanium (Ti): 0.001 ~ 0.01%, total amount should meet 0.01%≤B+V+Mn+Zr+Ti≤0.05%.
Wherein, in described copper alloy, add the content of element and can further select boron (B): 0.01 ~ 0.015%, vanadium (V): 0.01 ~ 0.015%, manganese (Mn): 0.001 ~ 0.005%, zirconium (Zr): 0.001 ~ 0.005%, titanium (Ti): 0.001 ~ 0.005%, total amount meets 0.01%≤B+V+Mn+Zr+Ti≤0.05%.
The boron (B), vanadium (V), manganese (Mn), zirconium (Zr) and the titanium (Ti) that in described copper alloy, add, with the form of insulating covering agent, join in copper alloy.In copper alloy preparation, adopt containing be selected from boron (B), vanadium (V) one or both, one or more insulating covering agent of manganese (Mn), zirconium (Zr) and titanium (Ti).All alloying element boron (B), vanadium (V), manganese (Mn), zirconium (Zr) and titanium (Ti) all use with the master alloy form being melting into copper separately.
Add acting as of insulating covering agent element:
Boron and vanadium: while adding boron, in copper ferrophosphor(us) crystallisation process, generate BC4, this compound can be used as the forming core core of alloy, thereby crystal grain thinning, play the effect of alterant, in addition Cu-B alloy has stronger deoxidizing capacity, in the time that boron content acquires a certain degree, can make oxygen-content reduction 10ppm left and right.The product of Cu-B alloy deoxidation is B
2o
3, 2Cu
2oB
2o
3, their density is little, low melting point is spherical liquid in copper liquid, be easy to assemble, floating and remove, on copper matrix without impact.Vanadium can generate intermetallic compound particle with other impurity in alloy, and these particles can be used as non-spontaneous nucleation core, play the effect of crystal grain thinning.The content of general boron and vanadium is suitable 0.01 ~ 0.02%.
Manganese, zirconium and titanium: these element solid solutions meeting segregation in melt, in the dendrite forward position of growing, hinders growing up of dendrite, thereby crystal grain thinning; In addition, these elements can with matrix elements outside impurity element generate the particle of indissoluble, these particles can be used as non-spontaneous nucleation center, play the effect of crystallization nucleus, increase nucleus quantity, play the effect of refinement copper ferrophosphor(us), can also purify melt.
Insulating covering agent with above-mentioned alloying element composition adds in smelting furnace; energy smelting furnace solution surface forms the good protective layer of one deck of thickness 5 ~ 80mm; in the outer air of effective obstruct molten bath, oxygen enters; avoid the oxidization burning loss of alloying element in fusion process; there is insulation effect, and the crystal grain of energy refined cast structure.
The present invention also provides a kind of less energy-consumption preparation and fabrication method of above-mentioned high performance Cu-Ni-Si series copper alloy.
A kind of preparation and fabrication method of high performance Cu-Ni-Si series copper alloy, comprise that following technical process: a. prepares burden, feeds intake according to mass percent, b. semicontinuous casting, c. hot rolling, d. milling face, e. cold roughing, f. annealing, g. pickling is rinsed and is scraped, h. in cold, roll, i. continuous annealing+solution treatment, j. ageing treatment, the cold finish rolling of k..
In step a, the described concrete order feeding intake is: first add Cu, after fusing, add again Ni, Si, add insulating covering agent (charcoal), after fully degasification, removal of impurities, then cover calcination charcoal, then the charcoal insulating covering agent that adds pure magnesium and contain Cu-B, Cu-V, Cu-Mn, Cu-Ti and/or Cu-Zr alloy, carries out melting.
Configuration charcoal insulating covering agent, according to weight percent, by Cu-B and/or Cu-V, and Cu-Mn, Cu-Ti and/or Cu-Zr master alloy mix, and then mix with charcoal, obtains charcoal insulating covering agent.Master alloy Cu-B, Cu-V, Cu-Mn, Cu-Ti, Cu-Zr all adopt the powdered alloy after grinding, and control its granularity below 800 μ m.
In step b, when semicontinuous casting, the temperature of casting is controlled at 1150～1250 DEG C.It is that after 70 ~ 80mm/min, disengaging crystallizer, normal pulling rate is 90 ~ 100mm/min that casting speed starts to be pulled.
In step c, hot-rolled temperature is 900 ~ 950 DEG C, and the time is 1 ~ 10h, and finishing temperature is controlled at more than 650 DEG C.
In steps d, the each milling 1mm of upper and lower surface.
In step e, the working modulus of described cold roughing is controlled at 40 ~ 85%.
In step f, the temperature of described annealing is 400～550 DEG C, and the time is 1～10h, and the type of cooling is air cooling or furnace cooling.
In step h, described working modulus of rolling in cold is controlled at 40 ~ 85%.
In step I, continuous annealing+solution treatment: in continuous annealing furnace, treatment temp is 750 DEG C ~ 900 DEG C, and through-rate is 1min/m, the type of cooling is spray processing.
In step j, described aging temperature is 400 ~ 550 DEG C, and the time is 1 ~ 6h, and the type of cooling is air cooling or furnace cooling.
In step k, the working modulus of described cold finish rolling is controlled at 20 ~ 40%.
The invention has the advantages that: compared with other copper alloy with high strength and high conductivity, high property copper alloy of the present invention, being all very good aspect intensity, electroconductibility or elasticity, corrosion-resistant, processability, also has good stress relaxation resistance simultaneously.And the preparation process of this alloy material is fairly simple, technical process is short, and energy consumption is low, and grain fineness number is little, pore or loose few, and lumber recovery is high.Realize preparation and the processing thereof of the less energy-consumption of high-performance Cu-Ni-Si series copper alloy, and excellent combination property.
The tensile strength sigma b of high-performance Cu-Ni-Si series copper alloy of the present invention can reach 730～820MPa, and plastic elongation rate δ is 8～10%, and specific conductivity is 40～50%IACS, and strand mean grain size is 100 ~ 150 μ m.This copper alloy has snappiness, high strength, high fatigability, good heat resistance, has had both the advantage of good electroconductibility simultaneously.Can be widely used in various elastic springs, electrical contact, spot welding limit, explosion-proof instrument, electrically contact components and parts, patch the occasions such as first device blank.
Embodiment
Less energy-consumption preparation and the working method of the high-performance Cu-Ni-Si series copper alloy described in the present invention, comprise that following technical process: a. is according to the mass percent b. semicontinuous casting of preparing burden, feed intake, c. hot rolling, d. milling face, the cold roughing of e., f. annealing, g. pickling is rinsed and is scraped, and rolls i. continuous annealing+solution treatment during h. is cold, j. ageing treatment, the cold finish rolling of k..
Wherein, concrete feeding sequence is: described in the concrete order that feeds intake be: first add Cu+Ni, add calcining charcoal covering → fusing+Si+ copper-magnesium master alloy (/ cobalt) → degasification → interpolation insulating covering agent.The temperature of casting is controlled at 1100～1200 DEG C; Hot-rolled temperature is 900～950 DEG C, and the time is 1～10h; The temperature of annealing is 400～550 DEG C, and the time is 1～10h, and the type of cooling is air cooling or furnace cooling; Continuous annealing+solution treatment: in continuous annealing furnace, treatment temp is 750 DEG C ~ 900 DEG C, and through-rate is 1min/m, the type of cooling is spray processing; Aging temperature is 400 ~ 550 DEG C, and the time is 1 ~ 6h, and the type of cooling is air cooling or furnace cooling.
Charcoal insulating covering agent in embodiment is prepared by following method: according to weight percent, by Cu-B and/or Cu-V, and Cu-Mn, Cu-Ti and/or Cu-Zr master alloy mix, and then mix with charcoal, obtains charcoal insulating covering agent.Master alloy Cu-B, Cu-V, Cu-Mn, Cu-Ti, Cu-Zr all adopt the powdered alloy after grinding, and control its granularity below 800 μ m.
Embodiment 1
Alloy of the present invention adopts following raw material melting: electrolytic copper, pure nickel, pure silicon, pure magnesium, Cu-B master alloy and Cu-Mn master alloy.The composition of alloy is in the embodiment 1 of table 1.
1. melting: adopt medium-frequency induction furnace to carry out melting.The addition sequence of alloy is: first add Cu, after fusing, then add Ni, Si, add insulating covering agent (charcoal) insulation 5～10min, after fully degasification, removal of impurities, then cover the thick calcination charcoal in 10mm left and right.After add pure magnesium and the charcoal insulating covering agent that contains Cu-B and Cu-Mn alloy, the temperature of melting is 1250 DEG C, after insulation 15min, leaves standstill 10～15min.
2. semicontinuous casting: the temperature of casting is 1150 DEG C.It is that after 70 ~ 80mm/min, disengaging crystallizer, normal pulling rate is 90 ~ 100mm/min that casting speed starts to be pulled.
3. hot rolling: alloy heats, Heating temperature is 900 DEG C, and soaking time is 4h, and hot rolling general working rate is 90%.
4. milling face: alloy is each milling 1mm up and down.
5. cold roughing: by carry out through the sheet alloy of milling face 80% cold rolling.
6. annealing: the cold rolled sheet that has carried out 80% is annealed, and annealing temperature is 400 DEG C, and soaking time is 5h.
7. pickling is rinsed and is scraped: the strip after annealing is carried out to pickling and rinse and scrape, remove surface scale.
8. in cold, roll: pickling is rinsed to the strip of scraping and carry out cold rollingly, cold processing ratio is 75%.
9. continuous annealing+solution treatment: strip is put into continuous annealing furnace, and temperature is 750 DEG C, and through-rate is 1min/m, subsequently spraying cooling.
10. ageing treatment: the strip after solid solution is carried out ageing treatment, aging temp is 500 DEG C, and soaking time is 4h, and the type of cooling is air cooling.
11. cold finish rolling: by the strip after timeliness carry out 30% cold rolling.
Through above melting, semicontinuous casting, hot rolling, milling face, hot rolling, cold roughing, annealing, pickling rinse and scrape, roll in cold, after the processing treatment such as continuous annealing, solution treatment, ageing treatment, cold finish rolling, its performance is in the embodiment 1 in table 2.In gained alloy, impurity content≤0.5%.
Embodiment 2
Alloy of the present invention adopts following raw material melting: electrolytic copper, pure nickel, pure silicon, pure magnesium, Cu-V master alloy and Cu-Mn master alloy.The composition of alloy is in the embodiment 2 of table 1.
1. melting: adopt medium-frequency induction furnace to carry out melting.The addition sequence of alloy is: first add Cu, after fusing, then add Ni, Si, add insulating covering agent (charcoal) insulation 5～10min, after fully degasification, removal of impurities, then cover the thick calcination charcoal in 10mm left and right.After add pure magnesium and the charcoal insulating covering agent that contains Cu-V and Cu-Mn alloy, the temperature of melting is 1270 DEG C, after insulation 15min, leaves standstill 10～15min.
2. semicontinuous casting: the temperature of casting is 1200 DEG C.It is that after 70 ~ 80mm/min, disengaging crystallizer, normal pulling rate is 90 ~ 100mm/min that casting speed starts to be pulled.
3. hot rolling: alloy heats, Heating temperature is 920 DEG C, and soaking time is 4h, and hot rolling general working rate is 92%.
4. milling face: alloy is each milling 1mm up and down.
5. cold roughing: by carry out through the sheet alloy of milling face 78% cold rolling.
6. annealing: the cold rolled sheet that has carried out 78% is annealed, and annealing temperature is 450 DEG C, and soaking time is 6h.
7. pickling is rinsed and is scraped: the strip after annealing is carried out to pickling and rinse and scrape, remove surface scale.
8. in cold, roll: pickling is rinsed to the strip of scraping and carry out cold rollingly, cold processing ratio is 80%.
9. continuous annealing+solution treatment: strip is put into continuous annealing furnace, and temperature is 800 DEG C, and through-rate is 1min/m, subsequently spraying cooling.
10. ageing treatment: the strip after solid solution is carried out ageing treatment, aging temp is 450 DEG C, and soaking time is 5h, and the type of cooling is air cooling.
11. cold finish rolling: by the strip after timeliness carry out 40% cold rolling.
Through above melting, semicontinuous casting, hot rolling, milling face, hot rolling, cold roughing, annealing, pickling rinse and scrape, roll in cold, after the processing treatment such as continuous annealing, solution treatment, ageing treatment, cold finish rolling, its performance is in the embodiment 2 in table 2.In gained alloy, impurity content≤0.5%.
Embodiment 3
Alloy of the present invention adopts following raw material melting: electrolytic copper, pure nickel, pure silicon, pure magnesium, Cu-B master alloy, Cu-Mn master alloy, Cu-V alloy and Cu-Ti master alloy.The composition of alloy is in the embodiment 3 of table 1.
1. melting: adopt medium-frequency induction furnace to carry out melting.The addition sequence of alloy is: first add Cu, after fusing, then add Ni, Si, add insulating covering agent (charcoal) insulation 5～10min, after fully degasification, removal of impurities, then cover the thick calcination charcoal in 10mm left and right.After add pure magnesium and the charcoal insulating covering agent that contains Cu-B, Cu-Mn, Cu-V, Cu-Ti alloy, the temperature of melting is 1230 DEG C, after insulation 15min, leaves standstill 10～15min.
2. semicontinuous casting: the temperature of casting is 1180 DEG C.It is that after 70 ~ 80mm/min, disengaging crystallizer, normal pulling rate is 90 ~ 100mm/min that casting speed starts to be pulled.
3. hot rolling: alloy heats, Heating temperature is 920 DEG C, and soaking time is 3h, and hot rolling general working rate is 90%.
4. milling face: alloy is each milling 1mm up and down.
5. cold roughing: by carry out through the sheet alloy of milling face 83% cold rolling.
6. annealing: the cold rolled sheet that has carried out 83% is annealed, and annealing temperature is 450 DEG C, and soaking time is 4h.
7. pickling is rinsed and is scraped: the strip after annealing is carried out to pickling and rinse and scrape, remove surface scale.
8. in cold, roll: pickling is rinsed to the strip of scraping and carry out cold rollingly, cold processing ratio is 85%.
9. continuous annealing+solution treatment: strip is put into continuous annealing furnace, and temperature is 900 DEG C, and through-rate is 1min/m, subsequently spraying cooling.
10. ageing treatment: the strip after solid solution is carried out ageing treatment, aging temp is 500 DEG C, and soaking time is 4h, and the type of cooling is air cooling.
11. cold finish rolling: by the strip after timeliness carry out 35% cold rolling.
Through above melting, semicontinuous casting, hot rolling, milling face, hot rolling, cold roughing, annealing, pickling rinse and scrape, roll in cold, after the processing treatment such as continuous annealing, solution treatment, ageing treatment, cold finish rolling, its performance is in the embodiment 3 in table 2.In gained alloy, impurity content≤0.5%.
Embodiment 4
Alloy of the present invention adopts following raw material melting: electrolytic copper, pure nickel, pure silicon, pure magnesium, Cu-B master alloy, Cu-Mn master alloy, Cu-V master alloy, Cu-Ti master alloy and Cu-Zr master alloy.The composition of alloy is in the embodiment 4 of table 1.
1. melting: adopt medium-frequency induction furnace to carry out melting.The addition sequence of alloy is: first add Cu, after fusing, then add Ni, Si, add insulating covering agent (charcoal) insulation 5～10min, after fully degasification, removal of impurities, then cover the thick calcination charcoal in 10mm left and right.After add pure magnesium and the charcoal insulating covering agent that contains Cu-B, Cu-Mn, Cu-V, Cu-Ti and Cu-Zr alloy, the temperature of melting is 1260 DEG C, after insulation 15min, leaves standstill 10～15min.
2. semicontinuous casting: the temperature of casting is 1200 DEG C.It is that after 70 ~ 80mm/min, disengaging crystallizer, normal pulling rate is 90 ~ 100mm/min that casting speed starts to be pulled.
3. hot rolling: alloy heats, Heating temperature is 910 DEG C, and soaking time is 4h, and hot rolling general working rate is 92%.
4. milling face: alloy is each milling 1mm up and down.
5. cold roughing: by carry out through the sheet alloy of milling face 78% cold rolling.
6. annealing: the cold rolled sheet that has carried out 78% is annealed, and annealing temperature is 400 DEG C, and soaking time is 5h.
7. pickling is rinsed and is scraped: the strip after annealing is carried out to pickling and rinse and scrape, remove surface scale.
8. in cold, roll: pickling is rinsed to the strip of scraping and carry out cold rollingly, cold processing ratio is 80%.
9. continuous annealing+solution treatment: strip is put into continuous annealing furnace, and temperature is 920 DEG C, and through-rate is 1min/m, subsequently spraying cooling.
10. ageing treatment: the strip after solid solution is carried out ageing treatment, aging temp is 520 DEG C, and soaking time is 3h, and the type of cooling is air cooling.
11. cold finish rolling: by the strip after timeliness carry out 40% cold rolling.
Through above melting, semicontinuous casting, hot rolling, milling face, hot rolling, cold roughing, annealing, pickling rinse and scrape, roll in cold, after the processing treatment such as continuous annealing, solution treatment, ageing treatment, cold finish rolling, its performance is in the embodiment 4 in table 2.In gained alloy, impurity content≤0.5%.
Embodiment 5
Alloy of the present invention adopts following raw material melting: electrolytic copper, pure nickel, pure silicon, pure magnesium, Cu-B master alloy and Cu-Ti master alloy.The composition of alloy is in the embodiment 1 of table 1.
1. melting: adopt medium-frequency induction furnace to carry out melting.The addition sequence of alloy is: first add Cu, after fusing, then add Ni, Si, add insulating covering agent (charcoal) insulation 5～10min, after fully degasification, removal of impurities, then cover the thick calcination charcoal in 10mm left and right.After add pure magnesium and the charcoal insulating covering agent that contains Cu-B and Cu-Ti alloy, the temperature of melting is 1250 DEG C, after insulation 15min, leaves standstill 10～15min.
2. semicontinuous casting: the temperature of casting is 1150 DEG C.It is that after 70 ~ 80mm/min, disengaging crystallizer, normal pulling rate is 90 ~ 100mm/min that casting speed starts to be pulled.
3. hot rolling: alloy heats, Heating temperature is 900 DEG C, and soaking time is 4h, and hot rolling general working rate is 90%.
4. milling face: alloy is each milling 1mm up and down.
5. cold roughing: by carry out through the sheet alloy of milling face 80% cold rolling.
6. annealing: the cold rolled sheet that has carried out 80% is annealed, and annealing temperature is 400 DEG C, and soaking time is 5h.
7. pickling is rinsed and is scraped: the strip after annealing is carried out to pickling and rinse and scrape, remove surface scale.
8. in cold, roll: pickling is rinsed to the strip of scraping and carry out cold rollingly, cold processing ratio is 75%.
9. continuous annealing+solution treatment: strip is put into continuous annealing furnace, and temperature is 750 DEG C, and through-rate is 1min/m, subsequently spraying cooling.
10. ageing treatment: the strip after solid solution is carried out ageing treatment, aging temp is 500 DEG C, and soaking time is 4h, and the type of cooling is air cooling.
11. cold finish rolling: by the strip after timeliness carry out 30% cold rolling.
Through above melting, semicontinuous casting, hot rolling, milling face, hot rolling, cold roughing, annealing, pickling rinse and scrape, roll in cold, after the processing treatment such as continuous annealing, solution treatment, ageing treatment, cold finish rolling, its performance is in the embodiment 5 in table 2.In gained alloy, impurity content≤0.5%.
The alloying constituent formula (wt%) of table 1, embodiment 1-5
Note "---" is labeled as and does not add alloy amount
The alloy property table of table 2, embodiment 1-5
The tensile strength of high-performance Cu-Ni-Si series copper alloy of the present invention can reach 730～820MPa, and plastic elongation rate is 8～10%, and specific conductivity is 40～50%IACS, and strand mean grain size is 130 ~ 150 μ m.Contrast C7025 alloy, alloy of the present invention, has higher intensity and specific conductivity, and the grain fineness number of its strand is also little than the grain fineness number of C7025 strand.This copper alloy has snappiness, high strength, high fatigability, good heat resistance, has had both the advantage of good electroconductibility simultaneously.
Claims (1)
1. a high-performance Cu-Ni-Si series copper alloy, is characterized in that: its composition according to weight percent is, Ni2.4%, and Si0.6%, Mg0.2%, B0.015%, V0.01%, Mn0.005%, Ti0.005%, Zr0.005%, all the other are Cu; Its preparation method is:
1) melting: adopt medium-frequency induction furnace to carry out melting; The addition sequence of alloy is: first add Cu, after fusing, then add Ni, Si, add insulating covering agent charcoal insulation 5～10min, after fully degasification, removal of impurities, then cover the thick calcination charcoal in 10mm left and right; After add pure magnesium and the charcoal insulating covering agent that contains Cu-B, Cu-Mn, Cu-V, Cu-Ti and Cu-Zr alloy, the temperature of melting is 1260 DEG C, after insulation 15min, leaves standstill 10～15min;
2) semicontinuous casting: the temperature of casting is 1200 DEG C; It is that after 70～80mm/min, disengaging crystallizer, normal pulling rate is 90～100mm/min that casting speed starts to be pulled;
3) hot rolling: alloy heats, Heating temperature is 910 DEG C, and soaking time is 4h, and hot rolling general working rate is 92%;
4) milling face: alloy is each milling 1mm up and down;
5) cold roughing: by carry out through the sheet alloy of milling face 78% cold rolling;
6) annealing: the cold rolled sheet that has carried out 78% is annealed, and annealing temperature is 400 DEG C, and soaking time is 5h;
7) pickling is rinsed and is scraped: the strip after annealing is carried out to pickling and rinse and scrape, remove surface scale;
8) in cold, roll: pickling is rinsed to the strip of scraping and carry out cold rollingly, cold processing ratio is 80%;
9) continuous annealing+solution treatment: strip is put into continuous annealing furnace, and temperature is 920 DEG C, and through-rate is 1min/m, subsequently spraying cooling;
10) ageing treatment: the strip after solid solution is carried out ageing treatment, aging temp is 520 DEG C, and soaking time is 3h, and the type of cooling is air cooling;
11) cold finish rolling: by the strip after timeliness carry out 40% cold rolling;
Through above melting, semicontinuous casting, hot rolling, milling face, cold roughing, annealing, pickling rinse and scrape, roll in cold, after continuous annealing, solution treatment, ageing treatment, cold finish rolling processing treatment, in gained alloy, impurity content≤0.5%.
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