CN106435305B - A kind of Aluminum alloy for high-strength mold slab and its production method - Google Patents
A kind of Aluminum alloy for high-strength mold slab and its production method Download PDFInfo
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- CN106435305B CN106435305B CN201610764318.6A CN201610764318A CN106435305B CN 106435305 B CN106435305 B CN 106435305B CN 201610764318 A CN201610764318 A CN 201610764318A CN 106435305 B CN106435305 B CN 106435305B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
Abstract
The invention discloses a kind of Aluminum alloy for high-strength mold slab and its production methods.The mass percentage requirement of each chemical element is Si≤0.25%, Fe≤0.45%, Cu 1.5~1.8% in aluminium alloy thick plate of the present invention, Mn≤0.25%, Mg 2.4~2.8%, Cr 0.19~0.25%, Zn 5.3~5.8%, Ti 0.02~0.03%, surplus Al.Raw material is placed in smelting furnace first and carries out melting, be subsequently placed in refining furnace and refine, gained molten aluminum is stood, refining, then cast, gained ingot casting carries out milling face, evenly heating processing, hot roughing, quenching, stretching and ageing treatment successively, obtains product Aluminum alloy for high-strength mold slab.The present invention has prepared high intensity, smooth, internal no hole, slag inclusion, and the Aluminum alloy for mold slab with compared with high-elongation and yield strength.
Description
First, technical field：
The invention belongs to technical field of aluminum alloy technology, and in particular to a kind of Aluminum alloy for high-strength mold slab and its producer
Method.
2nd, background technology：
The advantages of mold is mainly as made by steel at this stage, steel is that intensity is high, steel die is resistance under quenched state
Mill property is good, the advantages that being unlikely to deform；But there are still easily get rusty, install the defects of heavy, poor flexibility.Common aluminium alloy such as 1 system,
3 systems, 4 systems, 5 systems, 8 systems cannot function as mold purposes, and mainly such alloy strength is low, hardness is low, not heat-treatable strengthened, does
Gross distortion can be caused to scrap into mold materials；7 line aluminium alloys are current more common aluminium alloys, and 7 line aluminium alloys are as warm
Roll that state, Cold Rolled Strip intensity and its hardness are all very poor, but can changing there are one matter after carrying out solution treatment with 7 line aluminium alloys
Become, such as tensile strength, hardness, elongation percentage, yield strength all can be improved significantly, made mold materials and easily cut
It cuts, compared to a steel mold materials advantages.7 line aluminium alloys include zinc and magnesium, and intensity is most in relatively common aluminium alloy
Good is exactly 7075 alloys, and the parts of many CNC cuttings manufactures are exactly 7075 alloys；Zinc is mainly to close in this series
Gold element in addition little Xu magnesium alloys can enable material heat-treated, reaches very high strength characteristic.This series material generally all adds
Enter the alloys such as a small amount of copper, chromium, and wherein with 7075 aluminium alloy of number particularly commodity, intensity highest, be suitble to airplane frame and
High intensity accessory.
At present using 7075T651 slabs for mold materials and few, major concern factor is exactly the prior art, dress
The associated specifications that mold aluminium is not achieved such as standby, external developed regions are had many uses general using aluminium alloy as mold.Than
Such as：Punching press electronics, electric appliance casing accessory can be used as using high-strength aluminum alloy, because high-strength aluminum alloy is with the obvious advantage, after punching press
The advantages that material surface is smooth, smooth, easy processing.
3rd, the content of the invention：
The technical problem to be solved by the present invention is to：A kind of Aluminum alloy for high-strength mold slab and its production method are provided.
Using the method for the present invention by works such as melting, casting, milling face, homogenization heat treatment, heating, hot roughing, quenching, stretching, timeliness
Sequence has been prepared high intensity, smooth, internal no hole, slag inclusion, and has been closed with the mold compared with high-elongation and yield strength with aluminium
Golden slab.
To solve the above-mentioned problems, the present invention adopts the technical scheme that：
The present invention provides a kind of Aluminum alloy for high-strength mold slab, the quality of each chemical element in the aluminium alloy thick plate
Percentage composition requires：
Si≤0.25%, Fe≤0.45%, Cu 1.5~1.8%, Mn≤0.25%, Mg 2.4~2.8%, Cr 0.19
~0.25%, Zn 5.3~5.8%, Ti 0.02~0.03%, surplus Al.
Additionally, it is provided a kind of production method of above-mentioned Aluminum alloy for high-strength mold slab, the production method include with
Lower step：
A, melting：It is by the aluminium ingot of purity >=99.7%, the copper powder that mass content containing Cu is 75%, purity first
The ZINC ALLOY and aluminium titanium boron wire that 99.98% pure magnesium ingot, the chromium powder that mass content containing Cr is 75%, purity are 99.98% add
Enter in smelting furnace, melting is carried out under the conditions of 720~760 DEG C, when smelting time is 4.5~5.5 small；By gained molten aluminum after melting
It pours into refining furnace, refining 25~35 minutes is carried out under the conditions of 720~750 DEG C；Each chemical composition in gained molten aluminum after refining
Content requirement meet the mass percentage requirement of each chemical element in above-mentioned aluminium alloy thick plate；
B, the molten aluminum that step a meltings obtain is sent into standing furnace and stood, stand 20~40min；It is adopted in standing furnace
Carry out refinery process with nitrogen chlorine mixed gas, the temperature in refining process in stove is 720~750 DEG C, refining time for 30~
50mim；
C, cast：Step b by the molten aluminum after standing furnace melting is cast, obtains aluminium alloy cast ingot；
D, milling face：The aluminium alloy cast ingot that step c is obtained carries out milling face, controls big face unilateral side milling face amount >=12mm, facet
Unilateral milling face amount >=10mm, aluminium alloy cast ingot both sides thickness difference≤3mm；
E, evenly heating is handled：Aluminium alloy cast ingot behind step d milling faces is subjected to evenly heating processing；
F, hot rolling：By evenly heating, treated that aluminium alloy cast ingot is placed to room temperature, and then aluminium alloy cast ingot is heated
Processing, carries out hot roughing after heating, obtains aluminum alloy plate materials；
G, quench：After the aluminum alloy plate materials obtained after hot rolling are cooled to room temperature, it is fitted into glowing furnace, it is heated to 470~
480 DEG C, metal temperature keeps the temperature 30 minutes under the conditions of reaching 470~480 DEG C and is quenched；
H, stretch：Quenched plate is subjected to stretching operation, in drawing process drawing deformation control 0.3~
0.5%, smooth aluminum alloy plate materials are obtained after stretching；
I, ageing treatment：Plate after stretching is subjected to 220 DEG C of furnace gas constant temperature, ageing treatment when heat preservation 22 is small obtains
Product Aluminum alloy for high-strength mold slab.
According to the production method of above-mentioned Aluminum alloy for high-strength mold slab, refining described in step a is mixed using nitrogen chlorine
It closes gas and carries out refinery process.
According to the production method of above-mentioned Aluminum alloy for high-strength mold slab, the concrete operations cast described in step c
Process is：Molten aluminum obtained by step b is subjected to by-pass filtration first, online depassing unit is then introduced into and carries out online degasification, online
Secondary filtration and three-stage filtration are carried out after degasification successively；Gained molten aluminum is cast using casting machine after three-stage filtration, obtains aluminium
Alloy cast ingot.
According to the production method of above-mentioned Aluminum alloy for high-strength mold slab, the mistake of device during the by-pass filtration
Filter plate precision is 50PPi；Online degasification carries out molten aluminum using high-purity argon gas after by-pass filtration, graphite in online degassing procedure
The rotating speed of rotor is 450~650r/min, hydrogen content≤0.15ml/100g Al after online degasification；It is imported after online degasification
Secondary filtration and three-stage filtration, the filter plate precision of the secondary filtration is 60PPi, and the device that the three-stage filtration uses is 22
Pipe pipe type filtering device.
According to the production method of above-mentioned Aluminum alloy for high-strength mold slab, the temperature in the casting process is 695
~710 DEG C, the time for 1.5~2.0 it is small when.
According to the production method of above-mentioned Aluminum alloy for high-strength mold slab, the tool of the processing of evenly heating described in step e
Body process is：Aluminium alloy cast ingot behind milling face is added in soaking pit and is heated, it is 490 DEG C to control furnace gas constant temperature, stove
Bore temperature reaches 490 DEG C and starts to keep the temperature, when heat preservation 2~3 is small；Change furnace gas temperature after heat preservation as 455 DEG C, actual measurement metal temperature reaches
450~460 DEG C start to keep the temperature, when heat preservation 4~6 is small；It comes out of the stove after heat preservation natural cooling；
In the soaking pit furnace gas temperature by room temperature by 2~3 it is small when be warming up to 490 DEG C；Furnace gas temperature is by 490 DEG C through 2
~4 are cooled to 455 DEG C when small.
According to the production method of above-mentioned Aluminum alloy for high-strength mold slab, heating described in step f is：It will step
Rapid e evenly heatings treated aluminium alloy cast ingot is packed into pushing type heating furnace, 450 DEG C of furnace gas constant temperature, metal temperature reaches 390~
400 DEG C, when heat preservation 4~8 is small；Then furnace gas changes 450 DEG C of constant temperature, and metal temperature, which reaches 415~425 DEG C, comes out of the stove and rolled.
According to the production method of above-mentioned Aluminum alloy for high-strength mold slab, hot roughing described in step f is using 1+1 heat
Tandem mill carries out hot roughing, the cogging under the conditions of 415~425 DEG C, and 13~15 passage reversibles of roughing roll, and each passage is rolled
Thickness processed is 25~40mm, and the thickness of gained finished product is 23~25mm after roughing；Finishing temperature after hot roughing is 350~380
℃；The lotion pressure used in the hot rough rolling process for 0.35~0.45Mpa, during hot roughing emulsion temperature be 60~65 DEG C,
Mass concentration is 4.0~5.0%.
According to the production method of above-mentioned Aluminum alloy for high-strength mold slab, water is used in quenching process described in step g
40~50 DEG C of water temperature, from coming out of the stove to quenching shift time be 10~15 seconds.
The present invention is in quenching process using vertical continuous hardening furnace.
The positive beneficial effect of the present invention：
1st, the present invention in fusion-casting process using efficiently, easily degasification deslagging method, be carried out at the same time in casting process and remove
Gas and three-stage filtration significantly reduce the content of hydrogen in molten aluminum, completely remove oxidizing slag and control impurity content grain in aluminium
Footpath effectively prevents hole, the internal flaw that the generation of pin hole is brought to 7075 Aluminum alloy for mold within 0.005mm.
2nd, Aluminum alloy for mold slab produced by the invention without hole, without slag inclusion, thickness is to be visited inside the slab of 22-24mm
It the defects of wound reaches A-AA grades, is completely absent inner void, slag inclusion, is fully able to meet the smooth of Aluminum alloy for mold industry
It promotes；It is good, wear-resisting, excellent without hole etc. with structure property using mold made of aluminium alloy thick plate material produced by the invention
Point；And dreg defect in the prior art can be solved, thus, it is possible to effectively improve the service life of mold.
3rd, the present invention, by the uniform heating process preferably controlled, effectively disappears in Aluminum alloy for high-strength mold preparation process
Except ingot casting component segregation, the internal stress of ingot casting is reduced, chemical composition is uniform, and hot rolling is rolled using 13-15 passage heavy reductions
System makes internal grain crush completely, eliminates the internal flaws such as coarse grains, tissue looseness, finally mold is made to be obtained with plate product
It is promoted well.
4th, 7075 alloy T651 phase products mechanical performances and solution heat treatment has a much relations, in quenching process of the present invention
Using vertical continuous hardening furnace, which has the advantages such as heating rate is fast, water quenching speed is fast, deflection is small after quenching,
Heat treatment operation is carried out by vertical continuous hardening furnace and effectively improves the tensile strength of Aluminum alloy for mold, elongation percentage, surrender
Intensity and hardness number, products obtained therefrom can fully meet the relevant requirement of Aluminum alloy for mold.
5th, the finished product of Aluminum alloy for high-strength mold material T651 states prepared by the present invention, Tensile strength reach ＞
550Mpa, elongation percentage reach ＞ 10%, yield strength ＞ 480Mpa, and hardness is HB ＞ 160, is had compared with high-tensile and elongation percentage
Effect improves the performances such as Aluminum alloy for mold high intensity, high rigidity, impact resistance.
1 present invention of table prepares the performance test results of product
4th, specific embodiment：
The present invention is further explained with reference to embodiments, but is not intended to limit present disclosure.
Embodiment 1：
Aluminum alloy for high-strength mold slab of the present invention, the mass percentage requirement of each chemical element in aluminium alloy thick plate
For：
Si≤0.25%, Fe≤0.45%, Cu 1.6%, Mn≤0.25%, Mg 2.6%, Cr 0.22%, Zn
5.5%, Ti 0.025%, surplus Al.
Embodiment 2：
Aluminum alloy for high-strength mold slab of the present invention, the mass percentage requirement of each chemical element in aluminium alloy thick plate
For：
Si≤0.25%, Fe≤0.45%, Cu 1.5%, Mn≤0.25%, Mg 2.4%, Cr 0.19%, Zn
5.3%, Ti 0.020%, surplus Al.
Embodiment 3：
Aluminum alloy for high-strength mold slab of the present invention, the mass percentage requirement of each chemical element in aluminium alloy thick plate
For：
Si≤0.25%, Fe≤0.45%, Cu 1.8%, Mn≤0.25%, Mg 2.8%, Cr 0.25%, Zn
5.8%, Ti 0.03%, surplus Al.
Embodiment 4：
The production method of Aluminum alloy for high-strength mold slab described in the embodiment of the present invention 1, the detailed step of the production method
It is rapid as follows：
A, melting：It is by the aluminium ingot of purity >=99.7%, the copper powder that mass content containing Cu is 75%, purity first
The ZINC ALLOY and aluminium titanium boron wire that 99.98% pure magnesium ingot, the chromium powder that mass content containing Cr is 75%, purity are 99.98% add
Enter in smelting furnace, melting is carried out under the conditions of 740 DEG C, when smelting time is 5 small；Gained molten aluminum is poured into refining furnace after melting
In, refining 30 minutes (refinery process is carried out using nitrogen chlorine mixed gas in refining process) is carried out under the conditions of 730 DEG C；After refining
The content requirement of each chemical composition meets the quality percentage of each chemical element in aluminium alloy thick plate described in embodiment 1 in gained molten aluminum
Content requirement；
B, the molten aluminum that step a meltings obtain is sent into standing furnace and stood, stand 30min；Nitrogen is used in standing furnace
Chlorine mixed gas carries out refinery process, and the temperature in refining process in stove is 740 DEG C, refining time 40mim；
C, cast：Molten aluminum obtained by step b is subjected to by-pass filtration first, online depassing unit is then introduced into and is removed online
Gas carries out secondary filtration and three-stage filtration successively after line degasification；Gained molten aluminum is cast using casting machine after three-stage filtration,
When temperature in casting process is 700 DEG C, the time is 1.8 small, aluminium alloy cast ingot is obtained；
The filter plate precision of device is 50PPi during the by-pass filtration；High-purity argon gas pair is used after by-pass filtration
Molten aluminum carries out online degasification, and the rotating speed of graphite rotator is 500r/min in online degassing procedure, and hydrogen content after online degasification≤
0.15ml/100g Al；Secondary filtration is imported after online degasification and three-stage filtration, the filter plate precision of the secondary filtration are
60PPi, the device that the three-stage filtration uses is 22 pipe pipe type filtering device；
D, milling face：The aluminium alloy cast ingot that step c is obtained carries out milling face, controls big face unilateral side milling face amount >=12mm, facet
Unilateral milling face amount >=10mm, aluminium alloy cast ingot both sides thickness difference≤3mm；
E, evenly heating is handled：Aluminium alloy cast ingot behind step d milling faces is subjected to evenly heating processing；
Evenly heating processing detailed process be：Aluminium alloy cast ingot behind milling face is added in soaking pit and is heated,
Control furnace gas constant temperature for 490 DEG C (furnace gas temperature by room temperature by 2.5 it is small when be warming up to 490 DEG C), fire box temperature reaches 490 DEG C and opens
Begin to keep the temperature, when heat preservation 2.5 is small；Change after heat preservation furnace gas temperature for 455 DEG C (furnace gas temperature by 490 DEG C through 3 it is small when be cooled to 455
DEG C), actual measurement metal temperature reaches 455 DEG C and starts to keep the temperature, when heat preservation 5 is small；It comes out of the stove after heat preservation natural cooling；
F, hot rolling：By evenly heating, treated that aluminium alloy cast ingot is placed to room temperature, and then aluminium alloy cast ingot is heated
Processing, carries out hot roughing after heating, obtains aluminum alloy plate materials；
The heating is：Step e evenly heatings treated aluminium alloy cast ingot is packed into pushing type heating furnace, furnace gas is fixed
450 DEG C of temperature, metal temperature reach 400 DEG C, when heat preservation 4 is small；Then furnace gas changes 450 DEG C of constant temperature, and metal temperature reaches 420 DEG C and comes out of the stove
It is rolled；
The hot roughing carries out hot roughing using 1+1 continuous hot-rolling mills, and the cogging under the conditions of 420 DEG C, 14 passages of roughing can
Inverse formula rolls, and each passes thickness is 33mm, and the thickness of gained finished product is 23~25mm after roughing；Finish to gauge after hot roughing
Temperature is 360 DEG C；The lotion pressure used in the hot rough rolling process is 0.40Mpa, and emulsion temperature is 63 DEG C, matter during hot roughing
It is 4.5% to measure concentration；
G, quench：It after the aluminum alloy plate materials obtained after hot rolling are cooled to room temperature, is fitted into glowing furnace, is heated to 475 DEG C,
Metal temperature, which reaches and keeps the temperature and quenched under the conditions of 475 DEG C for 30 minutes, (uses 40~50 DEG C of the water temperature of water, from coming out of the stove in quenching process
It it is 15 seconds to quenching shift time)；
H, stretch：Quenched plate is subjected to stretching operation, in drawing process drawing deformation control draw 0.4%
Smooth aluminum alloy plate materials are obtained after stretching；
I, ageing treatment：Plate after stretching is subjected to 220 DEG C of furnace gas constant temperature, ageing treatment when heat preservation 22 is small obtains
Product Aluminum alloy for high-strength mold slab.
Embodiment 5：
The production method of Aluminum alloy for high-strength mold slab described in the embodiment of the present invention 2, the detailed step of the production method
It is rapid as follows：
A, melting：It is by the aluminium ingot of purity >=99.7%, the copper powder that mass content containing Cu is 75%, purity first
The ZINC ALLOY and aluminium titanium boron wire that 99.98% pure magnesium ingot, the chromium powder that mass content containing Cr is 75%, purity are 99.98% add
Enter in smelting furnace, melting is carried out under the conditions of 720 DEG C, when smelting time is 5.5 small；Gained molten aluminum is poured into refining furnace after melting
In, refining 35 minutes (refinery process is carried out using nitrogen chlorine mixed gas in refining process) is carried out under the conditions of 720 DEG C；After refining
The content requirement of each chemical composition meets the quality percentage of each chemical element in aluminium alloy thick plate described in embodiment 2 in gained molten aluminum
Content requirement；
B, the molten aluminum that step a meltings obtain is sent into standing furnace and stood, stand 20min；Nitrogen is used in standing furnace
Chlorine mixed gas carries out refinery process, and the temperature in refining process in stove is 720 DEG C, refining time 50mim；
C, cast：Molten aluminum obtained by step b is subjected to by-pass filtration first, online depassing unit is then introduced into and is removed online
Gas carries out secondary filtration and three-stage filtration successively after line degasification；Gained molten aluminum is cast using casting machine after three-stage filtration,
When temperature in casting process is 695 DEG C, the time is 2.0 small, aluminium alloy cast ingot is obtained；
The filter plate precision of device is 50PPi during the by-pass filtration；High-purity argon gas pair is used after by-pass filtration
Molten aluminum carries out online degasification, and the rotating speed of graphite rotator is 450r/min in online degassing procedure, and hydrogen content after online degasification≤
0.15ml/100g Al；Secondary filtration is imported after online degasification and three-stage filtration, the filter plate precision of the secondary filtration are
60PPi, the device that the three-stage filtration uses is 22 pipe pipe type filtering device；
D, milling face：The aluminium alloy cast ingot that step c is obtained carries out milling face, controls big face unilateral side milling face amount >=12mm, facet
Unilateral milling face amount >=10mm, aluminium alloy cast ingot both sides thickness difference≤3mm；
E, evenly heating is handled：Aluminium alloy cast ingot behind step d milling faces is subjected to evenly heating processing；
Evenly heating processing detailed process be：Aluminium alloy cast ingot behind milling face is added in soaking pit and is heated,
Control furnace gas constant temperature for 490 DEG C (furnace gas temperature by room temperature by 2 it is small when be warming up to 490 DEG C), fire box temperature reaches 490 DEG C of beginnings
Heat preservation, when heat preservation 2.0 is small；Change after heat preservation furnace gas temperature for 455 DEG C (furnace gas temperature by 490 DEG C through 2 it is small when be cooled to 455 DEG C),
Actual measurement metal temperature reaches 450 DEG C and starts to keep the temperature, when heat preservation 6 is small；It comes out of the stove after heat preservation natural cooling；
F, hot rolling：By evenly heating, treated that aluminium alloy cast ingot is placed to room temperature, and then aluminium alloy cast ingot is heated
Processing, carries out hot roughing after heating, obtains aluminum alloy plate materials；
The heating is：Step e evenly heatings treated aluminium alloy cast ingot is packed into pushing type heating furnace, furnace gas is fixed
450 DEG C of temperature, metal temperature reach 395 DEG C, when heat preservation 6 is small；Then furnace gas changes 450 DEG C of constant temperature, and metal temperature reaches 415 DEG C and comes out of the stove
It is rolled；
The hot roughing carries out hot roughing using 1+1 continuous hot-rolling mills, and the cogging under the conditions of 415 DEG C, 15 passages of roughing can
Inverse formula rolls, and each passes thickness is 25mm, and the thickness of gained finished product is 23~25mm after roughing；Finish to gauge after hot roughing
Temperature is 350 DEG C；The lotion pressure used in the hot rough rolling process is 0.35Mpa, and emulsion temperature is 60 DEG C, matter during hot roughing
It is 4.0% to measure concentration；
G, quench：It after the aluminum alloy plate materials obtained after hot rolling are cooled to room temperature, is fitted into glowing furnace, is heated to 470 DEG C,
Metal temperature, which reaches and keeps the temperature and quenched under the conditions of 470 DEG C for 30 minutes, (uses 40~50 DEG C of the water temperature of water, from coming out of the stove in quenching process
It it is 13 seconds to quenching shift time)；
H, stretch：Quenched plate is subjected to stretching operation, in drawing process drawing deformation control draw 0.3%
Smooth aluminum alloy plate materials are obtained after stretching；
I, ageing treatment：Plate after stretching is subjected to 220 DEG C of furnace gas constant temperature, ageing treatment when heat preservation 22 is small obtains
Product Aluminum alloy for high-strength mold slab.
Embodiment 6：
The production method of Aluminum alloy for high-strength mold slab described in the embodiment of the present invention 3, the detailed step of the production method
It is rapid as follows：
A, melting：It is by the aluminium ingot of purity >=99.7%, the copper powder that mass content containing Cu is 75%, purity first
The ZINC ALLOY and aluminium titanium boron wire that 99.98% pure magnesium ingot, the chromium powder that mass content containing Cr is 75%, purity are 99.98% add
Enter in smelting furnace, melting is carried out under the conditions of 760 DEG C, when smelting time is 4.5 small；Gained molten aluminum is poured into refining furnace after melting
In, refining 25 minutes (refinery process is carried out using nitrogen chlorine mixed gas in refining process) is carried out under the conditions of 750 DEG C；After refining
The content requirement of each chemical composition meets the quality percentage of each chemical element in aluminium alloy thick plate described in embodiment 3 in gained molten aluminum
Content requirement；
B, the molten aluminum that step a meltings obtain is sent into standing furnace and stood, stand 40min；Nitrogen is used in standing furnace
Chlorine mixed gas carries out refinery process, and the temperature in refining process in stove is 750 DEG C, refining time 30mim；
C, cast：Molten aluminum obtained by step b is subjected to by-pass filtration first, online depassing unit is then introduced into and is removed online
Gas carries out secondary filtration and three-stage filtration successively after line degasification；Gained molten aluminum is cast using casting machine after three-stage filtration,
When temperature in casting process is 710 DEG C, the time is 1.5 small, aluminium alloy cast ingot is obtained；
The filter plate precision of device is 50PPi during the by-pass filtration；High-purity argon gas pair is used after by-pass filtration
Molten aluminum carries out online degasification, and the rotating speed of graphite rotator is 600r/min in online degassing procedure, and hydrogen content after online degasification≤
0.15ml/100g Al；Secondary filtration is imported after online degasification and three-stage filtration, the filter plate precision of the secondary filtration are
60PPi, the device that the three-stage filtration uses is 22 pipe pipe type filtering device；
D, milling face：The aluminium alloy cast ingot that step c is obtained carries out milling face, controls big face unilateral side milling face amount >=12mm, facet
Unilateral milling face amount >=10mm, aluminium alloy cast ingot both sides thickness difference≤3mm；
E, evenly heating is handled：Aluminium alloy cast ingot behind step d milling faces is subjected to evenly heating processing；
Evenly heating processing detailed process be：Aluminium alloy cast ingot behind milling face is added in soaking pit and is heated,
Control furnace gas constant temperature for 490 DEG C (furnace gas temperature by room temperature by 3 it is small when be warming up to 490 DEG C), fire box temperature reaches 490 DEG C of beginnings
Heat preservation, when heat preservation 3 is small；Change after heat preservation furnace gas temperature for 455 DEG C (furnace gas temperature by 490 DEG C through 4 it is small when be cooled to 455 DEG C), it is real
Survey metal temperature reaches 460 DEG C and starts to keep the temperature, when heat preservation 4 is small；It comes out of the stove after heat preservation natural cooling；
F, hot rolling：By evenly heating, treated that aluminium alloy cast ingot is placed to room temperature, and then aluminium alloy cast ingot is heated
Processing, carries out hot roughing after heating, obtains aluminum alloy plate materials；
The heating is：Step e evenly heatings treated aluminium alloy cast ingot is packed into pushing type heating furnace, furnace gas is fixed
450 DEG C of temperature, metal temperature reach 390 DEG C, when heat preservation 8 is small；Then furnace gas changes 450 DEG C of constant temperature, and metal temperature reaches 425 DEG C and comes out of the stove
It is rolled；
The hot roughing carries out hot roughing using 1+1 continuous hot-rolling mills, and the cogging under the conditions of 425 DEG C, 13 passages of roughing can
Inverse formula rolls, and each passes thickness is 40mm, and the thickness of gained finished product is 23~25mm after roughing；Finish to gauge after hot roughing
Temperature is 380 DEG C；The lotion pressure used in the hot rough rolling process is 0.45Mpa, and emulsion temperature is 65 DEG C, matter during hot roughing
It is 5.0% to measure concentration；
G, quench：It after the aluminum alloy plate materials obtained after hot rolling are cooled to room temperature, is fitted into glowing furnace, is heated to 480 DEG C,
Metal temperature, which reaches and keeps the temperature and quenched under the conditions of 470 DEG C for 30 minutes, (uses 40~50 DEG C of the water temperature of water, from coming out of the stove in quenching process
It it is 15 seconds to quenching shift time)；
H, stretch：Quenched plate is subjected to stretching operation, in drawing process drawing deformation control draw 0.5%
Smooth aluminum alloy plate materials are obtained after stretching；
I, ageing treatment：Plate after stretching is subjected to 220 DEG C of furnace gas constant temperature, ageing treatment when heat preservation 22 is small obtains
Product Aluminum alloy for high-strength mold slab.
Claims (8)
1. a kind of production method of Aluminum alloy for high-strength mold slab, which is characterized in that the production method includes following step
Suddenly：
A, the mass percentage requirement of each chemical element is in the Aluminum alloy for high-strength mold slab：
Si≤0.25%, Fe≤0.45%, Cu 1.5~1.8%, Mn≤0.25%, Mg 2.4~2.8%, Cr 0.19~
0.25%, Zn 5.3~5.8%, Ti 0.02~0.03%, surplus Al；
B, melting：It is 99.98% first by the aluminium ingot of purity >=99.7%, the copper powder that mass content containing Cu is 75%, purity
The ZINC ALLOY and aluminium titanium boron wire that pure magnesium ingot, the chromium powder that mass content containing Cr is 75%, purity are 99.98% add in smelting furnace
In, melting is carried out under the conditions of 720~760 DEG C, when smelting time is 4.5~5.5 small；Gained molten aluminum is poured into refining after melting
In stove, refining 25~35 minutes is carried out under the conditions of 720~750 DEG C；The content of each chemical composition will in gained molten aluminum after refining
Ask the mass percentage requirement for meeting each chemical element in aluminium alloy thick plate described in step a；
C, the molten aluminum that step b meltings obtain is sent into standing furnace and stood, stand 20~40min；Nitrogen is used in standing furnace
Chlorine mixed gas carries out refinery process, and the temperature in refining process in stove is 720~750 DEG C, and refining time is 30~50mim；
D, cast：Step c by the molten aluminum after standing furnace melting is cast, obtains aluminium alloy cast ingot；
The specific operation process of the casting is：Molten aluminum obtained by step c is subjected to by-pass filtration first, is then introduced into online degasification
Device carries out online degasification, carries out secondary filtration and three-stage filtration successively after line degasification；Gained molten aluminum uses after three-stage filtration
Casting machine is cast, and obtains aluminium alloy cast ingot；
E, milling face：The aluminium alloy cast ingot that step d is obtained carries out milling face, controls big face unilateral side milling face amount >=12mm, and facet is unilateral
Milling face amount >=10mm, aluminium alloy cast ingot both sides thickness difference≤3mm；
F, evenly heating is handled：Aluminium alloy cast ingot behind step e milling faces is subjected to evenly heating processing；
G, hot rolling：By evenly heating, treated that aluminium alloy cast ingot is placed to room temperature, and then aluminium alloy cast ingot is heated,
Hot roughing is carried out after heating, obtains aluminum alloy plate materials；
H, quench：It after the aluminum alloy plate materials obtained after hot rolling are cooled to room temperature, is fitted into glowing furnace, is heated to 470~480
DEG C, metal temperature keeps the temperature 30 minutes under the conditions of reaching 470~480 DEG C and is quenched；
I, stretch：Quenched plate is subjected to stretching operation, in drawing process drawing deformation control draw 0.3~0.5%
Smooth aluminum alloy plate materials are obtained after stretching；
J, ageing treatment：Plate after stretching is subjected to 220 DEG C of furnace gas constant temperature, ageing treatment when heat preservation 22 is small obtains product
Aluminum alloy for high-strength mold slab.
2. the production method of Aluminum alloy for high-strength mold slab according to claim 1, which is characterized in that in step b
The refining carries out refinery process using nitrogen chlorine mixed gas.
3. the production method of Aluminum alloy for high-strength mold slab according to claim 1, which is characterized in that in step d
The filter plate precision of device is 50PPi during the by-pass filtration；Molten aluminum is carried out using high-purity argon gas after by-pass filtration
Online degasification, the rotating speed of graphite rotator is 450~650r/min in online degassing procedure, hydrogen content after online degasification≤
0.15ml/100g Al；Secondary filtration is imported after online degasification and three-stage filtration, the filter plate precision of the secondary filtration are
60PPi, the device that the three-stage filtration uses is 22 pipe pipe type filtering device.
4. the production method of Aluminum alloy for high-strength mold slab according to claim 1, which is characterized in that in step d
When temperature in the casting process is 695~710 DEG C, the time is 1.5~2.0 small.
5. the production method of Aluminum alloy for high-strength mold slab according to claim 1, which is characterized in that in step f
The detailed process of evenly heating processing is：Aluminium alloy cast ingot behind milling face is added in soaking pit and is heated, is controlled
Furnace gas constant temperature is 490 DEG C, and fire box temperature reaches 490 DEG C and starts to keep the temperature, when heat preservation 2~3 is small；Change furnace gas temperature after heat preservation as 455
DEG C, actual measurement metal temperature reaches 450~460 DEG C and starts to keep the temperature, when heat preservation 4~6 is small；It comes out of the stove after heat preservation natural cooling.
6. the production method of Aluminum alloy for high-strength mold slab according to claim 1, which is characterized in that in step g
The heating is：Step f evenly heatings treated aluminium alloy cast ingot is packed into pushing type heating furnace, 450 DEG C of furnace gas constant temperature,
Metal temperature reaches 390~400 DEG C, when heat preservation 4~8 is small；Then furnace gas changes 450 DEG C of constant temperature, and metal temperature reaches 415~425
It DEG C comes out of the stove and to be rolled.
7. the production method of Aluminum alloy for high-strength mold slab according to claim 1, which is characterized in that in step g
The hot roughing carries out hot roughing using 1+1 continuous hot-rolling mills, and the cogging under the conditions of 415~425 DEG C, 13~15 passages of roughing can
Inverse formula rolls, and each passes thickness is 25~40mm, and the thickness of gained finished product is 23~25mm after roughing；After hot roughing
Finishing temperature is 350~380 DEG C；The lotion pressure used in the hot rough rolling process is 0.35~0.45MPa, during hot roughing
Emulsion temperature is 60~65 DEG C, mass concentration is 4.0~5.0%.
8. the production method of Aluminum alloy for high-strength mold slab according to claim 1, which is characterized in that in step h
40~50 DEG C of the water temperature of water is used in the quenching process, is 10~15 seconds from coming out of the stove to quenching shift time.
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