CN104775060A - Production and heat treatment method of aluminum alloy continuous-casting continuous-rolling billet - Google Patents
Production and heat treatment method of aluminum alloy continuous-casting continuous-rolling billet Download PDFInfo
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Abstract
The present invention belongs to the technical field of non-ferrous metal processing, and particularly relates to a production and heat treatment method of a 5052 aluminum alloy continuous-casting continuous-rolling billet. The production and heat treatment method comprises steps such as smelting, continuous casting, continuous rolling, coiling and heat treatment, and is characterized in that the Hazelett continuous-casting continuous-rolling process is used after the smelting, and the smelting step comprises three refining and concretely comprises material preparing, aluminum alloy liquid smelting, first refining, slag skimming, alloy element adding, second refining, alloy component adjusting, third refining, degassing filtration, and standing. With the production and heat treatment method of the present invention, the key technology that the Hazelett process is adopted to produce the 5052 aluminum alloy plate material and perform the heat treatment is solved, the blank of the production process is filled up, and the high economic benefits and the high practical values are provided.
Description
Technical field
The invention belongs to technical field of nonferrous metal processing, particularly 5052 aluminum alloy continuous casting tandem rolling bases are produced and heat treating method.
Background technology
5052 alloys are that the thermal treatment of Al-Mg system can not intensified type rust-preventing aluminum alloy, have the characteristics such as good plasticity, weldability, medium tenacity, are widely used in defence and military and civil area.Be commonly used for the interior trim of automobile, bottle cap, fuel tanker, instrument, various container aluminium sheet alloy, building and ornament materials are as window shutter etc., and along with the development of relevant industries, the demand of 5052 aluminum alloy plate materials can be increasing.
Produce 5052 sheet alloys at present both at home and abroad and still produce 5052 alloys based on hot rolling for base mode, and technology is very ripe, its technical process is: melting one purifies an ingot casting one crop end one milling face one and heats hot rolling one packaging, but this method exists the shortcomings such as technical process length, production cycle length, high cost and highly energy-consuming, also Some Enterprises is had to attempt adopting cast rolling stock mode to produce 5052 aluminum alloy plate materials, there is the advantages such as low cost, flow process are short, environmental protection compared with slab hot-rolling mode, but the problem such as surface quality and component segregation easily appears in continuous casting and rolling blank, have influence on the performance of its final cold-rolled products, and continuous casting and rolling be continuous casting and tandem rolling two techniques in succession together with rolling technology, the equipment adopted is U.S. Ha Ziliete continuous casting and continuous rolling mill, first aluminum alloy melt is injected continuous caster and cast out blank, then directly by three continuous mills, it to be rolled, the cast rolled aluminium stock of more than 2.0mm can be produced, this technique is also known as air-sea flux, the casting that the production technique reheating rolling and continuous casting and rolling eliminates large plate ingot is first cast compared to traditional, ingot blank saw head milling face reheats again, the multiple tracks links such as the roughing mill split rolling method of large amount of finish, the aluminum finstock tissue characteristic of this explained hereafter is also between casting and semicontinuous casting, product performance are better than continuous casting and rolling plate, but comparatively hot-rolled sheet is slightly poor.But compared with air-sea flux and other two kinds of techniques, energy-saving and cost-reducing, cost-saving, there is obvious economic benefit and social benefit; Current air-sea flux is few in China's application, production technology is also immature, acquire a certain degree of difficulty when production complex alloys and comparatively wide plate band, easily formed during continuous casting the casting flaw such as surface segregation and hole this, produce made-up belt upper surface subsurface inclusion thing assemble and affect product surface quality, especially continuous casting and rolling is produced 5052 aluminum alloy hot rolling bands and is had typical variant texture and strong beta rolling texture, anneal and cold rollingly can affect Mechanical Properties of Aluminum Alloys consumingly.Current domestic employing air-sea flux is produced in 5052 alloy prioies also immature, also lacks the comprehensive analysis to its tissue signature, performance variation and stability and research simultaneously, is unfavorable for the optimization of production process and the raising of quality product.The development of this technique is made to receive very big restriction
In sum, develop a kind of 5052 aluminum alloy continuous casting tandem rolling bases to produce and heat-treating methods, not only changing domestic current employing air-sea flux, to produce 5052 aluminum alloy strips technologic immature and unstable, make cold rolling after sheet material mechanical property meet requirement in use, simultaneously also for scale operation from now on 5052 sheet alloy provides the necessary technical deposit, there is important theory significance and production practical value; The producer of current domestic employing Ha Ziliete production line production Aluminum Plate and Strip is also few, most of manufacturer lacks the understanding to Ha Ziliete production line, so research air-sea flux and the technology of heat treating method to this explained hereafter Aluminum sheets foil are significantly.
Summary of the invention
The object of this invention is to provide a kind of 5052 aluminum alloy continuous casting tandem rolling blanks to produce and heat-treating methods, make it to meet the requirement of follow-up cold-rolling process and the requirement of quality product.
The object of the invention is to be realized by following technical proposal
1. the chemical composition of 5052 aluminium alloys of the present invention is in table 1.
Table 1 alloy composition unit: %
2. a kind of production of aluminum alloy continuous casting tandem rolling base and heat treating method, comprise the step of melting, the step of continuous casting, the step of tandem rolling, the step of batching and heat treated step, it is characterized in that: after melting, adopt Ha Ziliete casting and rolling process, melting step comprises three refinement step, is specially batching, the melting of alloy aluminum liquid, initial refining, skims, adds alloying element, secondary refining, adjustment alloying constituent, three refinings, degassing and filtration, leaves standstill.
Casting and rolling process operation of the present invention comprises: alloy aluminum liquid melting one initial refining one of preparing burden is skimmed interpolation alloying element one secondary refining-adjustment alloying constituent-tri-time refining-degassing and filtration-leave standstill-continuous casting-tandem rolling-batch-thermal treatment.
3. melting
In described burden process, in alloying ingredient, electrolytic aluminium liquid is 85wt%, and solid material is 15%, and solid material comprises aluminium ingot, 5052 waste materials, magnesium ingot and other alloying elements batching.
First add aluminium ingot, 5052 waste materials enter electrolytic aluminium liquid, add No. two insulating covering agents and adopt induction stirring, the temperature of smelting furnace controls between for 750 ~ 760 DEG C, and carry out initial refining in stove, between refining temperature 710 ~ 720 DEG C, refining adopts Ar+Cl
2refining and induction stirring, skim after refining, adjusting component add Fe agent, Si agent, Cr additive, standing and reacting.
Described No. two insulating covering agent compositions are by KCl, MgCl
2and BaCl
2the powder solvent of composition is the insulating covering agent that aluminium alloy is special.
Standing and reacting 20min, then carry out secondary refining, refining temperature controls between 720 ~ 750 DEG C, and refining still adopts Ar+Cl
2refining and induction stirring; Magnesium ingot is added, sample examination adjusting component after composition is qualified; Before degasification, bar-shaped Al-5Ti-1B fining agent is added by chute; Carry out third time refining after leaving standstill 10 ~ 20min, between refining temperature 725 ~ 745 DEG C, refining adopts N
2+ Cl
2refining.
After grain-refining agent enters aluminium liquid, titanium content will reach 0.015%.
The present invention adopts SINF degasifying device online treatment and on-line filtration.
Before continuous casting and after start 20 min, survey hydrogen respectively once in front case position, hydrogen richness is less than 0.12ml/100gAl;
4. continuous casting
The present invention adopts Ha Ziliete continuous caster, and continuous casting 5052 aluminium alloy adopts Y steel band of model, SS lip; Graphite coating system carries out spraying once before casting half an hour, and in castingprocesses, strip edge occurs that breach need spray; Before casting, half an hour starts steel brush and clears up steel band, changes steel band spraying into pre-spray pattern subsequently, sprays in advance steel band;
Casting parameters of the present invention:
During continuous casting, front case temperature of aluminum liquid controls is 670 ~ 700 DEG C; Casting coolant water temperature 35 DEG C.
The length of casting region die cavity is 2362mm.
Casting speed: starting up speed 8.0 ~ 9.0m/min, casting speed adopts 10 ~ 11m/min.
Caster outlet board temperature edge 510 ~ 560 DEG C.
5052 continuously cast bloom size: 19mm × 1650mm × L that above continuous casting process is produced.
5. continuous rolling process
The technical process of tandem rolling: start confirmations-optimum configurations-analog rolling-milling train signal is sent to casting machine-casting beginning-cutting ends of band materials-3 frame threading and nip-helps and be rolled into merit-rolling condition foundation-plate form control-normally rolling.
Tandem rolling road sub-distribution of the present invention:
19mm (continuously cast bloom) → 11mm → 6.5mm → 3.7mm.
Continuous rolling process of the present invention realizes at MINO tri-tandem mill frame milling train; Finishing temperature control is between 170 ~ 230 DEG C; Plate form control is 0.2 ~ 0.5%; Finish to gauge thickness: 5.3 ± 0.05mm; Coil diameter: 1700 ~ 1800mm; Strip width: 1630 ~ 1640mm.
3. 5052 cast rolled aluminium stock annealing processs
Adopt the continuous billet casting surface cool speed of air-sea flux fast, so surface microstructure is tiny, its alloying element of the second-phase of intercrystalline precipitation cannot be separated out due to cooling fast, be solid-solubilized in supersaturation in matrix, and middle part speed of cooling wants slow a lot of relatively; The distribution of second-phase, form, size surface and middle difference, easily produce the casting flaw such as surface segregation and hole; Simultaneously continuous casting and rolling is produced 5052 aluminum alloy hot rolling bands and is had typical variant structure and strong beta rolling texture, and anneal and cold rollingly can affect Mechanical Properties of Aluminum Alloys consumingly.
For eliminating the ununiformity of composition and tissue, prevent the coarse grains after finished products, and obtain good final mechanical property, row annealing need be involved in continuous casting and rolling; Annealing process is: annealing temperature is between 330 ~ 360 DEG C, and annealing time controlled at 11 ~ 15 hours.
Adopt gordian technique of the present invention and advantage as follows:
1. the present invention is directed to the crucial production technology of Ha Ziliete casting and rolling process and be mainly reflected in the following aspects
Alloying ingredient is: the electrolytic aluminium liquid of 85%, 15% aluminium ingot and magnesium ingot and other alloying elements batching.
Control between 750 ~ 760 DEG C for 5052 aluminium alloy smelting temperature, first time refining adopts Ar+Cl
2refining and induction stirring; Secondary refining temperature after leaving standstill controls between 720 ~ 750 DEG C, and refining still adopts Ar+Cl
2refining and induction stirring;
During continuous casting, front case temperature of aluminum liquid controls is 670 ~ 700 DEG C; Casting coolant water temperature 35 DEG C; The length of casting region die cavity is 2362mm; Casting speed: starting up speed 8.0 ~ 9.0 m/min, casting speed adopts 10 ~ 11m/min; Caster outlet board temperature edge 510 ~ 560 DEG C;
Continuous rolling process is: 19mm (continuously cast bloom) → 11mm → 6.5mm → 3.7mm; Finishing temperature is greater than 170 DEG C.
2. the invention solves for 5052 aluminum alloy continuous casting tandem rolling base production technique and heat treated gordian technique, for continuous casting connects
The follow-up better formability of cold rolling and sheet material of rolling stock provides good structure property basis.Compared with producing the technology of sheet material with employing continuous casting and rolling base, heat-treated by the plate produced air-sea flux, reduce the casting flaws such as the surface segregation of casting process generation, control the form of second-phase and compound, distribution and shape, change textured finish and component in continuous casting and rolling production process simultaneously, increase recrystallization texture, reduce hot-rolled sheet and there is typical variant structure and strong beta rolling texture, thus affect the mechanical property of follow-up cold rolling rear 5052 aluminum alloy plate materials and follow-up deep shaping property.
According to 5052 plates of this explained hereafter, the mechanical property reached after being cold-rolled to 1.23 ~ 0.95 mm is: tensile strength sigma
b: 300 ~ 310 MPa, unit elongation δ: 3.0% ~ 3.5 %.
In sum, the present invention is adopted to propose a kind of production and heat treating method of aluminum alloy continuous casting tandem rolling base
,solve and adopt air-sea flux to produce 5052 alloy plate materials and heat treated gordian technique, solve the blank of this production technique domestic, have
Higher economic benefit and practical value.
Embodiment
Below in conjunction with embodiment, the invention will be further elaborated.Embodiment only for illustration of the present invention, instead of limits the present invention by any way.
embodiment
Adopt 85% electrolytic aluminium liquid, 15% solid material (99.70% technical pure aluminium ingot, solid 5052 waste material, magnesium ingot etc.) prepare this alloy, meet the furnace charge of the aluminum alloy smelting furnace of 20t capacity, chemical composition strictly by 5052 aluminum alloy chemical composition scopes perform.Setting smelting temperature is 750 ~ 760
0c, initial refining temperature is 715
0c, second time and for the third time refining temperature are 735
0c; Adopt SNIF degasification, add the agent of Al-5Ti-1B crystal grain thinning before degasification by chute, fining agent add-on controls as 10m/min; In melt, hydrogen richness controls within 0.12ml/100gAl; Front case casting temp 680 ± 5 DEG C, through on-line checkingi, actual measurement chemical composition is
。
Adopt Ha Ziliete continuous caster, continuous casting 5052 aluminium alloy adopts Y steel band of model, SS lip; Graphite coating system carries out spraying once before casting half an hour, and in castingprocesses, strip edge occurs that breach need spray again; Before casting, half an hour starts steel brush and clears up steel band, changes steel band spraying into pre-spray pattern subsequently, sprays in advance steel band.
During continuous casting, front case temperature of aluminum liquid controls is 680 ± 5 DEG C; Casting coolant water temperature 35 DEG C.
Casting speed: starting up speed 8.7 m/min, casting speed adopts 10.4m/min.
Caster outlet board temperature edge 540 DEG C.
5052 continuously cast bloom size: 19mm × 1650mm × L that above continuous casting process is produced.
Continuous rolling process realizes at MINO tri-tandem mill frame milling train; Finishing temperature control is at 200 DEG C; Plate form control is 0.3%; Finish to gauge thickness: 5.3 ± 0.05mm; Coil diameter: 1700 ~ 1800mm; Strip width 1630 ~ 1640mm.
Tandem rolling road sub-distribution of the present invention:
19mm (continuously cast bloom) → 11mm → 6.5mm → 3.7mm.
Involve in row annealing to above continuous casting and rolling, annealing process is: 340 DEG C/12h
By this explained hereafter 5 batch of 5052 plate, the mechanical property reached after being cold-rolled to 1.23 and 0.95mm is as table 2.
Adopt 5052 cast rolled aluminium stock that air-sea flux is produced, after heat treatment the mechanical performance index of cold rolled sheet meets mark
Alignment request.
Mechanical property after table 2 5052 cast rolled aluminium stock is cold rolling
| Lot number | Alloy | Specification | Tensile strength | Unit elongation |
| TR4851 | 5052 | 1.23 | 307 | 3.3 |
| TR4852 | 5052 | 1.23 | 300 | 3.5 |
| TR4853 | 5052 | 1.23 | 302 | 3.4 |
| TR4854 | 5052 | 0.95 | 312 | 3.4 |
| TR4855 | 5052 | 0.95 | 310 | 3.5 |
Claims (10)
1. the production of an aluminum alloy continuous casting tandem rolling base and heat treating method, comprise the step of melting, the step of continuous casting, the step of tandem rolling, the step of batching and heat treated step, it is characterized in that: after melting, adopt Ha Ziliete casting and rolling process, melting step comprises three refinement step, is specially batching, the melting of alloy aluminum liquid, initial refining, skims, adds alloying element, secondary refining, adjustment alloying constituent, three refinings, degassing and filtration, leaves standstill.
2. the production of a kind of aluminum alloy continuous casting tandem rolling base as claimed in claim 1 and heat treating method, is characterized in that the step of melting is:
Alloying ingredient, electrolytic aluminium liquid is 85wt%, and solid material is 15%, and solid material comprises aluminium ingot, 5052 waste materials, magnesium ingot and other alloying elements batching;
First add aluminium ingot, 5052 waste materials enter electrolytic aluminium liquid, add No. two insulating covering agents and adopt induction stirring, the temperature of smelting furnace controls between for 750 ~ 760 DEG C, and carry out initial refining in stove, between refining temperature 710 ~ 720 DEG C, refining adopts Ar+Cl
2refining and induction stirring, skim after refining, adjusting component add Fe agent, Si agent, Cr additive, standing and reacting;
Standing and reacting 20min, then carry out secondary refining, refining temperature controls between 720 ~ 750 DEG C, and refining still adopts Ar+Cl
2refining and induction stirring; Magnesium ingot is added, sample examination adjusting component after composition is qualified; Before degasification, bar-shaped Al-5Ti-1B fining agent is added by chute; Carry out third time refining after leaving standstill 10 ~ 20min, between refining temperature 725 ~ 745 DEG C, refining adopts N
2+ Cl
2refining.
3. the production of a kind of aluminum alloy continuous casting tandem rolling base as claimed in claim 2 and heat treating method, is characterized in that: described No. two insulating covering agent compositions are by KCl, MgCl
2and BaCl
2the powder solvent of composition is the insulating covering agent that aluminium alloy is special.
4. the production of a kind of aluminum alloy continuous casting tandem rolling base as claimed in claim 2 and heat treating method, is characterized in that: after grain-refining agent enters aluminium liquid, titanium content will reach 0.015%.
5. the production of a kind of aluminum alloy continuous casting tandem rolling base as claimed in claim 1 and heat treating method, is characterized in that: adopt SINF degasifying device online treatment and on-line filtration.
6. the production of a kind of aluminum alloy continuous casting tandem rolling base as claimed in claim 1 and heat treating method, is characterized in that: continuous casting adopts Ha Ziliete continuous caster, and continuous casting 5052 aluminium alloy adopts Y steel band of model, SS lip; Graphite coating system carries out spraying once before casting half an hour, and in castingprocesses, strip edge occurs that breach need spray; Before casting, half an hour starts steel brush and clears up steel band, changes steel band spraying into pre-spray pattern subsequently, sprays in advance steel band.
7. the production of a kind of aluminum alloy continuous casting tandem rolling base as claimed in claim 6 and heat treating method, is characterized in that casting parameters is: during continuous casting, front case temperature of aluminum liquid controls is 670 ~ 700 DEG C; Casting coolant water temperature 35 DEG C; The length of casting region die cavity is 2362mm; Casting speed: starting up speed 8.0 ~ 9.0m/min, casting speed adopts 10 ~ 11m/min; Caster outlet board temperature edge 510 ~ 560 DEG C; 5052 continuously cast bloom size: 19mm × 1650mm × L that above continuous casting process is produced.
8. the production of a kind of aluminum alloy continuous casting tandem rolling base as claimed in claim 6 and heat treating method, is characterized in that: before continuous casting and after start 20 min, survey hydrogen respectively once in front case position, hydrogen richness is less than 0.12ml/100gAl.
9. the production of a kind of aluminum alloy continuous casting tandem rolling base as claimed in claim 6 and heat treating method, is characterized in that the technical process of tandem rolling is: start confirmations-optimum configurations-analog rolling-milling train signal is sent to casting machine-casting beginning-cutting ends of band materials-3 frame threading and nip-helps and be rolled into merit-rolling condition foundation-plate form control-normally rolling.
10. the production of a kind of aluminum alloy continuous casting tandem rolling base as claimed in claim 9 and heat treating method, is characterized in that: tandem rolling passage is assigned as: 19mm (continuously cast bloom) → 11mm → 6.5mm → 3.7mm;
Continuous rolling process realizes at MINO tri-tandem mill frame milling train; Finishing temperature control is between 170 ~ 230 DEG C; Plate form control is 0.2 ~ 0.5%; Finish to gauge thickness: 5.3 ± 0.05mm; Coil diameter: 1700 ~ 1800mm; Strip width: 1630 ~ 1640mm.
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