CN102899540B - Super large specification aluminum alloy slab ingot and casting method - Google Patents

Super large specification aluminum alloy slab ingot and casting method Download PDF

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CN102899540B
CN102899540B CN201210283774.0A CN201210283774A CN102899540B CN 102899540 B CN102899540 B CN 102899540B CN 201210283774 A CN201210283774 A CN 201210283774A CN 102899540 B CN102899540 B CN 102899540B
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casting
slab ingot
ingot
refining
aluminium
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CN201210283774.0A
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CN102899540A (en
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沈海鸥
胡传彬
姚祥
胡少莉
蓝东华
贺应钦
黄金宁
樊春阳
雷志峰
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广西南南铝加工有限公司
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Abstract

The invention discloses a super large specification aluminum alloy slab ingot and a casting method. The method comprises the following steps: preparing raw materials according to ratio, then adding in a melting furnace for melting and removing the slag; conversing to a heat preserving furnace for on-line degassing and refining, degassing, removing the slag and purifying, adding an aluminum titanium boron grain-refining agent for refining the crystal grains; then casting to the aluminum alloy slab ingot; and finally homogenizing to obtain the aluminum alloy slab ingot with difficult cracking and refined tissue. The produced 650*2750mm slab ingot is capable of eliminating the segregation and casting stress of the slab ingot, and guaranteeing the product quality, the mechanical properties can satisfy the requirements of the large-scale structural members.

Description

A kind of super large-scale aluminium alloy slab ingot and castmethod thereof
Technical field
The present invention relates to aluminium alloy casting field, specifically relate to a kind of super large-scale aluminium alloy slab ingot and castmethod thereof.
Background technology
5083 belong to Al-Mg-Si system alloy, and use range is extensive, and particularly construction industry be unable to do without this alloy, is the most promising alloy.Its solidity to corrosion is good, excellent weldability, and cold-workability is better, and has medium tenacity.In 5083 alloys, main alloy element is Mg.Mg can improve mobility, improve processing characteristics, intensity and yield strength can be improved, carry heavy alloyed machinability, but when add-on is large, castability is poor, intensity at high temperature and plasticity are all low, shrink large during cooling, easily cause hot tearing and formed loosening and reducing elongation, increase the viscosity of alloy, therefore strictly will control content.Si can increase tensile strength, improves alloy flowability, reduces shrinking percentage and hot cracking tendency, reduces thermal expansivity, improves resistance to air loss, wear resistance, solidity to corrosion and thermal conductivity, but when add-on is large, can cause machining difficulty.Titanium (Ti) add-on is energy crystal grain thinning suitably, prevents coarse-grain, and has the effect suppressing Feather-like Crystal.
Due to chemical composition and the crystalline phase composition all very complexity of 5083 aluminium alloys, therefore in alloy, principal element content, proportioning and the foreign matter content structure and properties to ingot casting and finished product has a great impact.Existing 5083 as-cast aluminum alloy mechanical properties are as follows:
Tensile strength sigma b(MPa):>=110;
Yield strength σ 0.2(MPa):>=110;
Elongation δ 5(%):>=12;
The main alloy element of 5083 is magnesium, there is good formed machining performance, corrosion stability, weldability, medium tenacity, for the manufacture of the sheet metal component of fuel tanker, oil pipe and vehicular traffic, boats and ships, instrument, street lamp support and rivet, hardware, electric appliance casing etc.But 5083 casting aluminium alloy flat blooms of largest domestic are 600 × 2200mm at present, the specification limits of the slab ingot specification of rolling and forging finished product, make the range of application of finished product wide not, some large aircraft cannot use monolithic plate of moderate thickness, need by welding or having riveted.Often there is open grain structure in the 5083 large-size aluminum alloy slab ingots using existing foundry engieering to produce, and flat bloom surface easily occurs drawing trace, therefore limits its specification and operation strategies.Therefore need to develop new large gauge slab ingot with meeting the market requirement, ensure its quality simultaneously.
Summary of the invention
The object of the invention is to solve existing 5083 Mechanical Properties of Aluminum Alloys low, the slab ingot specification cast out is little, market demand and aluminium alloy flat bloom can not be adapted to and easily occur that the problem of trace is drawn on the easy to crack and surface of open grain structure, slab ingot, provide one to utilize 5083 aluminum alloy casts to produce super large-scale aluminium alloy slab ingot and the castmethod thereof of 650 × 2750mm.
Technical scheme of the present invention:
The alloying constituent mass percent of super large-scale aluminium alloy slab ingot of the present invention is as follows:
Si?:?0.00~0.40????????Fe?:?0.00~0.40??????????Cu?:?0.00~0.10
Mn?:?0.40~1.00???????Mg?:?4.00~4.90??????????Cr?:?0.05~0.25
Zn: 0.00 ~ 0.25 Ti: 0.00 ~ 0.15 surplus is Al
Each constituent mass per-cent sum is 100%.
Super large-scale aluminium alloy slab ingot castmethod of the present invention comprises the steps:
(1) prepare burden
According to remelted aluminum ingot and 5083 aluminium alloy returns consumptions that alloying constituent calculated purity is 99.7%, then mix is carried out, the per-cent that 5083 aluminium alloy returns consumptions account for total input amount is 0.1 ~ 60%, calculate to close in the middle of load weighted Mn and AlCr75 master alloy for subsequent use.
(2) melting
A. the remelted aluminum ingot prepared and 5083 aluminium alloy returns are dropped in smelting furnace and heat, then add AlMn75 master alloy, AlCr75 master alloy; Be heated to furnace charge in smelting furnace melt, then the electromagnetic mixing apparatus starting furnace bottom stirs 10min ~ 30min, promotes the even of temperature of aluminum liquid and composition in stove, the thawing of accelerating solid raw material;
B. treat that stove internal solid metal all melts, temperature of aluminum liquid reaches 735 DEG C ~ 755 DEG C, proceeds to holding furnace.
(3) be incubated
Furnace charge is at holding furnace inside holding, temperature controls at 735 DEG C ~ 755 DEG C, first aluminium liquid composition detects, then first add AlMn75 master alloy and carry out composition adjustment, then add AlTi6, pure magnesium ingot adjusting component, elementary refining 10min ~ 15min is carried out after composition adjustment completes, elementary refining argon flow amount 50 ~ 60L/min, keeps in elementary refining process stirring, cleaning scum silica frost.
(4) online refinery by de-gassing, grain refining and filtration
A, startup holding furnace rollover prevention system, make aluminium liquid inject chute, carry out online refinery by de-gassing through degasifying device, except hydrogen, and rotor argon flow amount 150 ~ 180L/min, rotor speed 400 ~ 500rpm/min.
B, grain refining are after degasifying device, before entering filtration unit, add aluminium Ti, B grain graining agent and carry out grain refining in aluminium liquid, and its add-on is 1 ~ 1.5 kg/t Al.
Enter filtration devices after c, grain refining, allow aluminium liquid remove trickleer impurity through strumbox, reach purification object.
(5) cast
A, open cooling water valve, guarantee that casting starting stage cooling power is abundant, flow 25 ~ 65 m 3/ hr, hydraulic pressure is 0.09 ~ 0.11Mpa;
B, aluminium liquid after filtering put into slab ingot and distribute chute, control pin and open, aluminium liquid injects in crystallizer;
Ingot-guiding head below c, crystallizer slowly declines, and casting enters normal phase, casting speed 20mm/min ~ 50mm/min, until reach predetermined casting length, is cast as the slab ingot of 650 × 2750mm;
D, stopping casting, close water coolant, remove crystallizer platform, hung out by slab ingot with special hanger from casting well.
(6) Homogenization Treatments
A, with suspender, slab ingot is placed in charging tray, slab ingot and charging tray is sent in soaking pit in the lump and carries out Homogenization Treatments;
B, Homogenization Treatments process are divided into heating and holding stage, and heat-up time is 7 ~ 9 hours, and after temperature reaches 580 ~ 600 DEG C, soaking time is 23 ~ 25 hours, and holding temperature is 580 ~ 600 DEG C;
C, to be incubated, slab ingot has been shifted out soaking pit, sent into cooling room and carry out cooling and completes.
The raw material remelted aluminum ingot adopted in the present invention, 5083 aluminium alloy returns, AlMn75 master alloy, AlMn75 master alloy, AlTi6 and pure magnesium ingot all can be produced from market or enterprise and obtain.
Advantage of the present invention:
1, the aluminium alloy flat bloom specification of manufacture of the present invention is 650 × 2670mm, is casting aluminium alloy flat bloom maximum in the world now.Can be used for structural part and the coating member of large aircraft or high-performance building, and reduce the number of times of riveted joint and welding, improve stability.
2, method of the present invention effectively removes impurity and hydrogen in aluminium liquid, by the cooperation of grain-refining agent addition, cooling water flow and casting speed, eliminate grain segregation and casting stress, make the even refinement of aluminium alloy microtexture, without splitting, there is good processing characteristics.The adjustment of alloying constituent also improves the performance of slab ingot, as control Fe and massfraction less than 0.40%, decrease the formation of AlMnFeSi phase, the intensity of alloy, plasticity and erosion resistance all improved a lot.
3, unit elongation improves, structure refinement.Ti, B grain graining agent has excellent thinning effect, makes foundry goods obtain tiny equiax crystal, eliminates feather crystalline substance, for later processing provides good inherent weave construction, effectively can overcome casting crack, improve slab ingot outward appearance, reduces ingot casting cold shut; Due to the refining effect of the heterogeneous nucleus of additive, can effectively reduce pore with loose simultaneously, improve the unit elongation after slab ingot rolling significantly.
4, slab ingot is not easy to crack, strict controls casting speed and casting temp, excessive velocities or excessively slow, temperature drift or on the low sidely all can cause slab ingot drawing crack.
Embodiment
Below in conjunction with embodiment, the present invention is further described, but the present invention is not limited to embodiment.
Embodiment 1
The alloying constituent mass percent of super large-scale aluminium alloy slab ingot is by as follows
Si?:?0.00~0.40????????Fe?:?0.00~0.40??????????Cu?:?0.00~0.10
Mn?:?0.40~0.70???????Mg?:?4.00~4.50??????????Cr?:?0.05~0.25
Zn: 0.00 ~ 0.25 Ti: 0.00 ~ 0.15 surplus is Al
Aluminium alloy flat bloom castmethod:
(1) prepare burden: be remelted aluminum ingot and the 5083 aluminium alloy returns consumptions of 99.7% according to alloying constituent calculated purity, then mix is carried out, the per-cent that 5083 aluminium alloy returns consumptions account for total input amount is 0.1 ~ 30%, calculates load weighted AlMn75 master alloy, AlCr75 master alloy is for subsequent use.
(2) melting: by charge calculation acquired results, starts to feed intake, and first drops into remelted aluminum ingot and 5083 aluminium alloy returns, then drops into AlMn75 master alloy, AlCr75 master alloy.Be heated to furnace charge in smelting furnace melt, stir 10min ~ 30min, temperature of aluminum liquid proceeds to holding furnace after reaching 735 DEG C ~ 755 DEG C.
(3) be incubated: holding furnace temperature controls at 735 DEG C ~ 755 DEG C, first detect the al alloy component in holding furnace, then add AlMn75 master alloy and carry out composition adjustment, then add AlTi6, pure magnesium ingot.Carry out elementary refining 10min ~ 15min after composition adjustment completes, elementary refining argon flow amount 50 ~ 60L/min, keep in elementary refining process stirring, cleaning scum silica frost.
(4) online refinery by de-gassing: elementary refining terminates, and aluminium liquid proceeds to degasifying device and carries out online refinery by de-gassing, removing hydrogen, rotor argon flow amount 150 ~ 180L/min, rotor speed 400 ~ 500rpm/min.
(5) grain refining and filtration: grain refining is after degasifying device, before entering filtration unit, adds aluminium Ti, B grain graining agent and carries out grain refining in aluminium liquid, and its add-on is 1.5 kg/t Al.Enter filtration devices after grain refining, screen plate uses 30ppi grade.
(6) cast: first open cooling water valve, guarantee that casting starting stage cooling power is abundant, the aluminium liquid after filtration is put into distribution chute by described casting, and casting speed 20mm/min ~ 30mm/min, first opens water quench before casting, flow 25 ~ 45 m 3/ hr, pressure is 0.09 ~ 0.11Mpa, the slab ingot of the 650 × 2750mm cast out; Stop casting, close water coolant, remove crystallizer platform, with special hanger, slab ingot is hung out from casting well.
(7) Homogenization Treatments: be placed in charging tray by slab ingot with suspender, sends into slab ingot and charging tray in the lump in soaking pit and carries out Homogenization Treatments; Homogenization Treatments process is divided into heating and holding stage, and heat-up time is 8.5 hours, and soaking time is 25 hours, and holding temperature is 590 DEG C; Insulation completes, and slab ingot is shifted out soaking pit, cools.
The present embodiment controls the mass percent of Mn and Mg, and the slab ingot tensile strength of casting is greater than 115MPa, and yield strength is greater than 115MPa, and unit elongation is greater than 20%, and ingot casting surface smoothness is better.
Embodiment 2
Different, as follows from the aluminium alloy flat bloom alloying constituent mass percent in example 1
Si?:?0.00~0.40????????Fe?:?0.00~0.40??????????Cu?:?0.00~0.10
Mn?:?0.70~1.00???????Mg?:?4.50~4.90??????????Cr?:?0.05~0.25
Zn: 0.00 ~ 0.25 Ti: 0.00 ~ 0.15 surplus is Al
Aluminium alloy flat bloom castmethod:
(1) prepare burden: be remelted aluminum ingot and the 5083 aluminium alloy returns consumptions of 99.7% according to alloying constituent calculated purity, then mix is carried out, the per-cent that 5083 aluminium alloy returns consumptions account for total input amount is 30 ~ 60%, calculates load weighted AlMn75 master alloy, AlCr75 master alloy is for subsequent use.
(2) melting: by charge calculation acquired results, starts to feed intake, and first drops into remelted aluminum ingot and 5083 aluminium alloy returns, then drops into AlMn75 master alloy, AlCr75 master alloy.Be heated to furnace charge in smelting furnace melt, stir 20min ~ 30min, temperature of aluminum liquid proceeds to holding furnace after reaching 745 DEG C ~ 755 DEG C.
(3) be incubated: holding furnace temperature controls at 745 DEG C ~ 755 DEG C, first detect the al alloy component in holding furnace, then add AlMn75 master alloy and carry out composition adjustment, then add AlTi6, pure magnesium ingot.Carry out elementary refining 10min ~ 15min after composition adjustment completes, elementary refining argon flow amount 50 ~ 60L/min, keep in elementary refining process stirring, cleaning scum silica frost.
(4) online refinery by de-gassing: elementary refining terminates, and aluminium liquid proceeds to degasifying device and carries out online refinery by de-gassing, removing hydrogen, rotor argon flow amount 150 ~ 180L/min, rotor speed 400 ~ 500rpm/min.
(5) grain refining and filtration: grain refining is after degasifying device, before entering filtration unit, adds aluminium Ti, B grain graining agent and carries out grain refining in aluminium liquid, and its add-on is 1.0 kg/t Al.Enter filtration devices after grain refining, screen plate uses 30ppi grade.
(6) cast: first open cooling water valve, guarantee that casting starting stage cooling power is abundant, the aluminium liquid after filtration is put into distribution chute by described casting, and casting speed 30mm/min ~ 50mm/min, first opens water quench before casting, flow 45 ~ 65 m 3/ hr, pressure is 0.09 ~ 0.11Mpa, the slab ingot of the 650 × 2750mm cast out; Stop casting, close water coolant, remove crystallizer platform, with special hanger, slab ingot is hung out from casting well.
(7) Homogenization Treatments: be placed in charging tray by slab ingot with suspender, sends into slab ingot and charging tray in the lump in soaking pit and carries out Homogenization Treatments; Homogenization Treatments process is divided into heating and holding stage, and heat-up time is 8 hours, and soaking time is 24 hours, and holding temperature is 590 DEG C; Insulation completes, and slab ingot is shifted out soaking pit, cools.
The present embodiment controls the mass percent of Mn and Mg, and the slab ingot tensile strength of casting is greater than 112MPa, and yield strength is greater than 112MPa, and unit elongation is greater than 20%, and ingot casting surface smoothness is better.
Embodiment 3
Different, as follows from the aluminium alloy flat bloom alloying constituent mass percent in example 1
Si?:?0.10~0.40????????Fe?:?0.10~0.40??????????Cu?:?0.10~0.10
Mn?:?0.10~0.40???????Mg?:?4.20~4.70??????????Cr?:?0.05~0.15
Zn: 0.10 ~ 0.25 Ti: 0.10 ~ 0.15 surplus is Al
Aluminium alloy flat bloom castmethod:
(1) prepare burden: be remelted aluminum ingot and the 5083 aluminium alloy returns consumptions of 99.7% according to alloying constituent calculated purity, then mix is carried out, the per-cent that 5083 aluminium alloy returns consumptions account for total input amount is 25 ~ 45%, calculates load weighted AlMn75 master alloy, AlCr75 master alloy is for subsequent use.
(2) melting: by charge calculation acquired results, starts to feed intake, and first drops into remelted aluminum ingot and 5083 aluminium alloy returns, then drops into AlMn75 master alloy, AlCr75 master alloy.Be heated to furnace charge in smelting furnace melt, stir 20min ~ 30min, temperature of aluminum liquid proceeds to holding furnace after reaching 735 DEG C ~ 745 DEG C.
(3) be incubated: first detect the al alloy component in holding furnace, then add AlMn75 master alloy and carry out composition adjustment, then add AlTi6, pure magnesium ingot.Carry out elementary refining 10min ~ 15min after composition adjustment completes, elementary refining argon flow amount 50 ~ 60L/min, keep in elementary refining process stirring, cleaning scum silica frost.
(4) online refinery by de-gassing: elementary refining terminates, and aluminium liquid proceeds to degasifying device and carries out online refinery by de-gassing, removing hydrogen, rotor argon flow amount 160 ~ 180L/min, rotor speed 400 ~ 450rpm/min.
(5) grain refining and filtration: add aluminium Ti, B grain graining agent between degasifying device and filtration unit, add-on is 1.2kg/t Al.Filter after refinement, screen plate uses 30ppi grade.
(6) cast: first open cooling water valve, guarantee that casting starting stage cooling power is abundant, the aluminium liquid after filtration is put into distribution chute by described casting, and casting speed 20mm/min ~ 40mm/min, first opens water quench before casting, flow 45 ~ 55 m 3/ hr, pressure is 0.09 ~ 0.11Mpa, the slab ingot of the 650 × 2750mm cast out; Stop casting, close water coolant, remove crystallizer platform, with special hanger, slab ingot is hung out from casting well.
(7) Homogenization Treatments: be placed in charging tray by slab ingot with suspender, sends into slab ingot and charging tray in the lump in soaking pit and carries out Homogenization Treatments; Homogenization Treatments process is divided into heating and holding stage, and heat-up time is 9 hours, and soaking time is 23 hours, and holding temperature is 600 DEG C; Insulation completes, and slab ingot is shifted out soaking pit, cools.
The slab ingot tensile strength of the present embodiment casting is greater than 113MPa, and yield strength is greater than 113MPa, and unit elongation is greater than 20%, and ingot casting surface smoothness is better.
Embodiment 4
Different, as follows from the aluminium alloy flat bloom alloying constituent mass percent in example 1
Si?:?0.20~0.40????????Fe?:?0.20~0.40??????????Cu?:?0.20~0.10
Mn?:?0.70~0.90???????Mg?:?4.50~4.80??????????Cr?:?0.15~0.25
Zn: 0.20 ~ 0.25 Ti: 0.05 ~ 0.15 surplus is Al
Aluminium alloy flat bloom castmethod:
(1) prepare burden: be remelted aluminum ingot and the 5083 aluminium alloy returns consumptions of 99.7% according to alloying constituent calculated purity, then mix is carried out, the per-cent that 5083 aluminium alloy returns consumptions account for total input amount is 30 ~ 60%, calculates load weighted AlMn75 master alloy, AlCr75 master alloy is for subsequent use.
(2) melting: by charge calculation acquired results, starts to feed intake, and first drops into remelted aluminum ingot and 5083 aluminium alloy returns, then drops into AlMn75 master alloy, AlCr75 master alloy.Be heated to furnace charge in smelting furnace melt, stir 20min ~ 30min, temperature of aluminum liquid proceeds to holding furnace after reaching 745 DEG C ~ 755 DEG C.
(3) be incubated: first detect the al alloy component in holding furnace, then add AlMn75 master alloy and carry out composition adjustment, then add AlTi6, pure magnesium ingot.Carry out elementary refining 10min ~ 15min after composition adjustment completes, elementary refining argon flow amount 50 ~ 60L/min, keep in elementary refining process stirring, cleaning scum silica frost.
(4) online refinery by de-gassing: elementary refining terminates, and aluminium liquid proceeds to degasifying device and carries out online refinery by de-gassing, removing hydrogen, rotor argon flow amount 160 ~ 180L/min, rotor speed 450 ~ 500rpm/min.
(5) grain refining and filtration: add aluminium Ti, B grain graining agent between degasifying device and filtration unit, add-on is 1.3kg/t Al.Filter after refinement, screen plate uses 30ppi grade.
(6) cast: first open cooling water valve, guarantee that casting starting stage cooling power is abundant, the aluminium liquid after filtration is put into distribution chute by described casting, and casting speed 35mm/min ~ 50mm/min, first opens water quench before casting, flow 45 ~ 65 m 3/ hr, pressure is 0.09 ~ 0.10Mpa, the slab ingot of the 650 × 2750mm cast out; Stop casting, close water coolant, remove crystallizer platform, with special hanger, slab ingot is hung out from casting well.
(7) Homogenization Treatments: be placed in charging tray by slab ingot with suspender, sends into slab ingot and charging tray in the lump in soaking pit and carries out Homogenization Treatments; Homogenization Treatments process is divided into heating and holding stage, and heat-up time is 7 hours, and soaking time is 25 hours, and holding temperature is 580 DEG C; Insulation completes, and slab ingot is shifted out soaking pit, cools.
The slab ingot tensile strength of the present embodiment casting is greater than 112MPa, and yield strength is greater than 112MPa, and unit elongation is greater than 20%, and ingot casting surface smoothness is better.

Claims (4)

1. the castmethod of a super large-scale aluminium alloy slab ingot, comprise batching, melting, insulation, online refinery by de-gassing, grain refining, casting, Homogenization Treatments, it is characterized in that: described batching be according to alloying constituent calculated purity be 99.7% remelted aluminum ingot and 5083 aluminium alloy returns consumptions, then carry out mix, the per-cent that 5083 aluminium alloy returns consumptions account for total input amount is 0.1 ~ 60%;
Described insulation refers to that aluminium liquid is at holding furnace inside holding, temperature controls at 735 DEG C ~ 755 DEG C, then first add AlMn75 master alloy and carry out composition adjustment, add AlTi6 again, pure magnesium ingot adjusting component, carries out elementary refining 10min ~ 15min after composition adjustment completes, elementary refining argon flow amount 50 ~ 60L/min, keep in elementary refining process stirring, cleaning scum silica frost;
The aluminium liquid inflow degasifying device that described online refinery by de-gassing is through elementary refining carries out online refinery by de-gassing, rotor argon flow amount 150 ~ 180L/min, rotor speed 400 ~ 500rpm;
Described grain refining is after degasifying device, and before entering filtration unit, add aluminium Ti, B grain graining agent and carry out grain refining in aluminium liquid, its add-on is 1 ~ 1.5 kg/t Al, and the aluminium liquid after grain refining enters filtration devices;
The mass percent of described aluminium alloy flat bloom alloying constituent is:
Si?:?0.00~0.40????????Fe?:?0.00~0.40??????????Cu?:?0.00~0.10
Mn?:?0.40~1.00???????Mg?:?4.00~4.90??????????Cr?:?0.05~0.25
Zn: 0.00 ~ 0.25 Ti: 0.00 ~ 0.15 surplus is Al.
2. the castmethod of super large-scale aluminium alloy slab ingot according to claim 1, it is characterized in that: described melting first the remelted aluminum ingot of having prepared burden and 5083 aluminium alloy returns is dropped into smelting furnace, and then adds AlMn75 master alloy, AlCr75 master alloy; Furnace charge stirs 10min ~ 30min after smelting furnace melts, after temperature of aluminum liquid reaches 735 DEG C ~ 755 DEG C, proceed to holding furnace.
3. the castmethod of super large-scale aluminium alloy slab ingot according to claim 1, it is characterized in that: the aluminium liquid after filtration is put into slab ingot shunting disk by described casting, be cast as the slab ingot of 650 × 2750mm, casting speed 20mm/min ~ 50mm/min, first open water quench before casting, flow 25 ~ 65 m 3/ hr, pressure is 0.09 ~ 0.11MPa.
4. the castmethod of super large-scale aluminium alloy slab ingot according to claim 3, it is characterized in that: described Homogenization Treatments refers to and heated 7 ~ 9 hours at soaking pit by the slab ingot cast, be incubated 23 ~ 25 hours after temperature reaches 580 ~ 600 DEG C, finally cooled.
CN201210283774.0A 2012-08-10 2012-08-10 Super large specification aluminum alloy slab ingot and casting method CN102899540B (en)

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