CN104313414A - Aluminum-magnesium alloy and preparation method of plate of aluminum-magnesium alloy - Google Patents
Aluminum-magnesium alloy and preparation method of plate of aluminum-magnesium alloy Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses an aluminum-magnesium alloy and a preparation method of a plate of the aluminum-magnesium alloy, and relates to the technical field of alloy materials. The aluminum-magnesium alloy comprises the following chemical components in percentage by mass: less than 0.3% of iron, less than 0.2% of silicon, 0.1% of copper, 0.3-0.6% of manganese, 4.7-5.5% of magnesium, less than or equal to 0.1% of zinc, less than 0.1% of titanium, 0.05-0.15% of zirconium, less than 0.05% of lanthanide elements, less than or equal to 0.0005% of sodium, 0.0005-0.003% of beryllium, less than or equal to 0.05% of other single impurities, less than or equal to 0.15% of other impurities, and the balance of aluminum. The preparation method comprises the following steps: blending the above materials, melting into cast ingots, sawing and milling the surfaces of the cast ingots, heating the cast ingots to be 450-470 DEG C for 12-24 hours, performing thermal rough rolling and thermal fine rolling on the cast ingots, coiling a plate, and naturally cooling, wherein the final rolling temperature is 330-350 DEG C. The aluminum-magnesium alloy disclosed by the invention has the characteristics of high strength, high extension rate and good thermal stability.
Description
Technical field
The present invention relates to technical field of alloy material, especially a kind of aluminum magnesium alloy for the manufacture of the vehicles and preparation of plates method thereof.
Background technology
Take magnesium as the feature that the 5XXX line aluminium alloy of main alloy element has quality light, anti-corrosion good, easy-formation, medium tenacity, be widely used in the vehicles manufactures such as auto sheet, tank wagon, coal conveyor, boats and ships, manufacture the vehicles with aluminium alloy and obviously can alleviate deadweight, improve carrying capacity, reduce energy consumption.Along with the development of society, people require that the vehicles possess higher use properties and reliability, and the over-all propertieies such as this mechanical property to some parts material, processability, thermostability it is also proposed higher requirement.For some the parts manufacture aluminium alloy on automobile, tank car, require that material property meets tensile strength sigma
b=280 ~ 350Mpa, yield strength σ
0.2>=125 Mpa, elongation δ>=26%, simultaneously there is not obvious decline in material intensity after baking of spraying paint.This just requires that material preserves very high unit elongation when higher-strength, to improve the processability of material, requires that material has very high resistance toheat simultaneously, has higher safety performance to make the vehicles prepared.
The product produced by composition proportion and the controlling of production process of current 5XXX aluminium alloy routine or meeting intensity index can not meet unit elongation index, or meet the intensity that unit elongation can not meet baking front and back, be difficult to carry out stably manufactured to this kind of high performance alloys, therefore, for producing high-quality Al-Mg alloy, be necessary to carry out new alloying constituent research and and technological design.
Summary of the invention
The object of this invention is to provide a kind of aluminum magnesium alloy and preparation of plates method thereof, this alloy and preparation method can solve the aluminum magnesium alloy poor stability that prior art is produced, and are difficult to the problem of the index request simultaneously meeting higher intensity and unit elongation.
In order to solve the problem, the technical solution used in the present invention is:
This aluminum magnesium alloy is made up of the chemical composition of following masses per-cent: iron <0.3%, silicon <0.2%, copper <0.1%, manganese 0.3% ~ 0.6%, magnesium 4.7 ~ 5.5%, zinc≤0.1%, titanium <0.1%, zirconium 0.05 ~ 0.15%, lanthanon <0.05%, sodium≤0.0005%, beryllium 0.0005% ~ 0.003%, all the other single impurity≤0.05%, all the other impurity adds up to≤0.15%, and surplus is aluminium; Wherein lanthanon is one or more elements in lanthanum, cerium, praseodymium, erbium.
The step adopting above-mentioned chemical composition to prepare aluminium-magnesium alloy sheet is:
A, by above-mentioned chemical composition and mass percent requirement batching after, founding becomes ingot casting;
B, sawing, milling face are carried out to ingot casting, make surfacing flawless;
The ingot casting of C, heating steps B gained, controlling Heating temperature is 450 DEG C ~ 470 DEG C, and heat-up time is 12 hours ~ 24 hours;
D, carry out hot roughing to the ingot casting after heating, then carry out hot finishing, the finishing temperature of hot finishing is 330 DEG C ~ 350 DEG C;
E, by after curling for the sheet material of step D gained, naturally cooling.
In technique scheme, technical scheme can also be more specifically: in steps A, founding becomes the processing step of ingot casting to comprise: melting, converter, covering, leave standstill, degasification, casting, wherein, alloy melting temp is 730 DEG C ~ 760 DEG C, converter temperature is 730 DEG C ~ 740 DEG C, dwell temperature is 720 DEG C ~ 740 DEG C, hydrogen richness≤0.25 after degasification milliliter/100 grams of aluminium, casting temp is 675 DEG C ~ 685 DEG C, casting speed is 45 mm/min ~ 50 mm/min, and the monolithic ingot casting cooling water inflow in castingprocesses is 900 liters/min ~ 1250 liters/min.
Further, in step B, the both ends of the surface of first sawing ingot casting, then the upper and lower surface of ingot casting and side carry out milling faces, the sawing amount at described ingot casting two ends is greater than 150 millimeters, and the milling face amount of upper and lower surface is greater than 10 millimeters, and the milling face amount of side is greater than 6 millimeters.
Further, in step D, the start rolling temperature of hot roughing is 440 DEG C ~ 470 DEG C, and finishing temperature is 370 DEG C ~ 430 DEG C; The start rolling temperature of hot finishing is 360 DEG C ~ 420 DEG C, and the sheet metal thickness after finish rolling completes is 5 millimeters ~ 9 millimeters.
Further, after step e, align cooled sheet material, after sheet material aligning, longitudinal roughness is not more than 0.3%, and horizontal roughness is not more than 0.4%.Wherein, longitudinal roughness is the ratio of thickness and spiral-plate length, and horizontal roughness is the ratio of thickness and spiral-plate width.
Iron in the present invention and silicon are impurity element, their mass percent are controlled respectively in 0.3%, 0.2%, to reduce these disadvantageous effect of impurity unit to unit elongation; Magnesium elements is main alloy element, and Mg content is set to 4.7 ~ 5.5%, and improving the object of Mg content is improve its solid solubility in the base to ensure the requirement of strength of material.
Manganese in alloy, copper, Zn content are less, and mainly manganese, copper add in alloy and can form MnAl
6, CuMgAl
2, Al
2cu phase, has a negative impact to the unit elongation of material, though zinc adds in alloy form MgZn
2, Al
2mg
3zn
2the corrosion resisting property of material is improved Deng compound, if but zinc controls not with great difficulty generation zinc flower, therefore Zn content controlled within 0.1%.
Add a small amount of titanium, zirconium in alloy, its objective is and form heterogeneous forming core particle in the melt, with crystal grain thinning, zirconium also can form Al with aluminium in addition
3zr particle dispersion in the base, plays strengthening effect.
Add lanthanide rare (lanthanum, cerium, praseodymium, erbium) in alloy, lanthanide rare and hydrogen have larger avidity, can adsorb in a large number and dissolved hydrogen, and form stable compound, can not be gathered into bubble, and the hydrogen content of aluminium and porosity are obviously reduced; Lanthanide rare and nitrogen generate infusible compound, and in fusion process, major part is got rid of with the form of slag, thus reach the object of purification aluminium liquid.Lanthanide rare-earth atoms Nature comparison is active, is fused to the surface imperfection very easily filling up alloy phase in aluminium liquid, the surface tension on new and old two-phase interface is reduced, improves the speed of growth of nucleus; Surface-active film can also be formed between crystal grain and fused solution simultaneously, stop the grain growth generated, refining alloy tissue.Compound easily forms the compound phase between rare earth aluminium when adding, the mismatch of compound phase and matrix is lower, increases heterogeneous nucleation efficiency, adds a small amount of rare earth just energy well refining alloy as-cast grain structure, can reduce production cost.
Lanthanide rare and zirconium all can form small and dispersed phase with aluminium, and these disperse phases play pinning effect to crystal boundary, subgrain boundary, dislocation, make it move and become more difficult with motion, therefore can improve recrystallization temperature and the thermostability of material.
Alloy is made to ensure that the sheet material produced has good intensity, unit elongation, thermostability from composition by mentioned component design.
The present invention adopts 450 ~ 470 DEG C/12 ~ 24h to heat ingot casting, to eliminate ingot casting in process of setting because cooling the component segregation comparatively fast caused on the one hand, for subsequent thermal tandem rolling provides temperature basis on the other hand, in the present invention, temperature reduces relatively, this mainly in alloy Mg content higher, avoid the too high generation of temperature to organize burning.
The finishing temperature control of hot finishing is 330 ~ 350 DEG C, and batch its naturally cooling of relief to realize self-annealing to the sheet material after hot finishing in the present invention, no longer carry out finished products, therefore finishing temperature will directly determine the mechanical property of finished product.Because adding the element such as zirconium, lanthanide rare in the present invention, improve the recrystallization temperature of material, if temperature is too low, material can not realize recrystallize, and thus work hardening can not be eliminated, unit elongation can decline, if temperature is too high, require that start rolling temperature is higher, require to improve ingot casting Heating temperature, can cause ingot structure burning, the too high strength of materials that also may cause of temperature is inadequate.
Owing to have employed technique scheme, the present invention compared with prior art has following beneficial effect: by regulating and controlling the control to composition and processing parameter, produced the Al-Mg alloy of high combination property, material property meets: tensile strength sigma
b=280 ~ 350Mpa, yield strength σ
0.2>=125 Mpa, elongation δ>=26%, stable performance after baking, the material produced has that intensity is high, unit elongation is high, the feature of Heat stability is good.
Embodiment
Below by specific embodiment and comparative example, technical scheme of the present invention is described in further detail, but the present invention is not limited to these embodiments.
Embodiment one:
The chemical composition of the aluminum magnesium alloy of the present embodiment and mass percent are: iron 0.28%, silicon 0.18%, copper 0.03%, manganese 0.4%, magnesium 5.4%, zinc 0.04%, titanium 0.08%, zirconium 0.1%, lanthanum 0.04%, sodium≤0.0005%, beryllium 0.0005% ~ 0.003%, all the other single impurity≤0.05%, all the other impurity adds up to≤0.15%, and surplus is aluminium.
The step of the preparation method of aluminium-magnesium alloy sheet is:
A, by above-mentioned chemical composition and mass percent requirement batching after, founding becomes ingot casting, the processing step of founding comprises: melting, converter, covering, leave standstill, degasification, casting, wherein, alloy melting temp is 740 DEG C ~ 750 DEG C, converter temperature is 730 DEG C ~ 740 DEG C, dwell temperature is 720 DEG C ~ 730 DEG C, hydrogen richness≤0.25 after degasification milliliter/100 grams of aluminium, casting temp is 678 DEG C ~ 682 DEG C, casting speed is 48 mm/min, and the monolithic ingot casting cooling water inflow in castingprocesses is 1000 liters/min ~ 1100 liters/min;
B, sawing, milling face are carried out to ingot casting, the both ends of the surface of first sawing ingot casting, then the upper and lower surface of ingot casting and side carry out milling faces, make surfacing flawless, wherein, the sawing amount at ingot casting two ends is 210 millimeters, the milling face amount of upper and lower surface is 12 millimeters, and the milling face amount of side is 8 millimeters;
The ingot casting of C, heating steps B gained, controlling Heating temperature is 460 DEG C, and heat-up time is 20 hours;
D, by heating after ingot casting through the hot roughing of multi-pass, the start rolling temperature of hot roughing is 455 DEG C, and finishing temperature is 372 DEG C; Again this sheet material is carried out hot finishing by continuous finishing train, the start rolling temperature of hot finishing is 365 DEG C, and finishing temperature is 338 DEG C, and the sheet metal thickness after finish rolling completes is 7 millimeters;
E, by curling for the sheet material of step D finish rolling gained, allow after its naturally cooling, obtain the aluminum magnesium alloy product of desired properties, in process of cooling, avoiding high wind to blowing;
Follow-up operation after step e, can be aligned cooled sheet material, and after sheet material aligning, longitudinal roughness is 0.18%, and horizontal roughness is 0.26%, carries out cutting after aligning by finished product requirement.
In order to test the performance of the aluminum magnesium alloy product of gained, from the material after aligning, intercept test samples, a part directly carries out mechanics properties testing, part baking 3 times, the temperature of each baking is 210 DEG C, and the time is 10 minutes, carries out mechanics properties testing again after baking.Detected result as shown in Table 1, high from the known product strength of the present invention of detected result, unit elongation is high, after baking, mechanical properties decrease is very little, before and after all reaching traffic baking, mechanics performance variation is very little, its Heat stability is good is described, the mechanical property of product all reaches the performance index manufacturing some particular component simultaneously.
Table one
Embodiment two:
The chemical composition of the aluminum magnesium alloy of the present embodiment and mass percent are: iron 0.25%, silicon 0.15%, copper 0.04%, manganese 0.35%, magnesium 5.2%, zinc 0.04%, titanium 0.04%, zirconium 0.06%, lanthanum, cerium and praseodymium add up to 0.03%, sodium≤0.0005%, beryllium 0.0005% ~ 0.003%, all the other single impurity≤0.05%, all the other impurity adds up to≤0.15%, and surplus is aluminium.
The step of the preparation method of aluminium-magnesium alloy sheet is:
A, by above-mentioned chemical composition and mass percent requirement batching after, founding becomes ingot casting, the processing step of founding comprises: melting, converter, covering, leave standstill, degasification, casting, wherein, alloy melting temp is 745 DEG C ~ 755 DEG C, converter temperature is 730 DEG C ~ 740 DEG C, dwell temperature is 720 DEG C ~ 730 DEG C, hydrogen richness≤0.25 after degasification milliliter/100 grams of aluminium, casting temp is 680 DEG C ~ 685 DEG C, casting speed is 49 mm/min, and the monolithic ingot casting cooling water inflow in castingprocesses is 1100 liters/min ~ 1200 liters/min;
B, sawing, milling face are carried out to ingot casting, the both ends of the surface of first sawing ingot casting, then the upper and lower surface of ingot casting and side carry out milling faces, make surfacing flawless, wherein, the sawing amount at ingot casting two ends is 180 millimeters, the milling face amount of upper and lower surface is 11 millimeters, and the milling face amount of side is 8 millimeters;
The ingot casting of C, heating steps B gained, controlling Heating temperature is 465 DEG C, and heat-up time is 16 hours;
D, by heating after ingot casting through the hot roughing of multi-pass, the start rolling temperature of hot roughing is 460 DEG C, and finishing temperature is 380 DEG C; Again this sheet material is carried out hot finishing by continuous finishing train, the start rolling temperature of hot finishing is 372 DEG C, and finishing temperature is 343 DEG C, and the sheet metal thickness after finish rolling completes is 7 millimeters;
E, by curling for the sheet material of step D finish rolling gained, allow after its naturally cooling, obtain the aluminum magnesium alloy product of desired properties, in process of cooling, avoiding high wind to blowing;
Follow-up operation after step e, can be aligned cooled sheet material, and after sheet material aligning, longitudinal roughness is 0.2%, and horizontal roughness is 0.24%, carries out cutting after aligning by finished product requirement.
In order to test the performance of the aluminum magnesium alloy product of gained, from the material after aligning, intercept test samples, a part directly carries out mechanics properties testing, part baking 3 times, the temperature of each baking is 210 DEG C, and the time is 10 minutes, carries out mechanics properties testing again after baking.Detected result as shown in Table 2, high from the known product strength of the present invention of detected result, unit elongation is high, after baking, mechanical properties decrease is very little, before and after all reaching traffic baking, mechanics performance variation is very little, its Heat stability is good is described, the mechanical property of product all reaches the performance index manufacturing some particular component simultaneously.
Table two
Embodiment three:
The chemical composition of the aluminum magnesium alloy of the present embodiment and mass percent are: iron 0.24%, silicon 0.16%, copper 0.03%, manganese 0.37%, magnesium 5%, zinc 0.05%, titanium 0.06%, zirconium 0.08%, lanthanum, cerium and erbium add up to 0.03%, sodium≤0.0005%, beryllium 0.0005% ~ 0.003%, all the other single impurity≤0.05%, all the other impurity adds up to≤0.15%, and surplus is aluminium.
The step of the preparation method of aluminium-magnesium alloy sheet is:
A, by above-mentioned chemical composition and mass percent requirement batching after, founding becomes ingot casting, the processing step of founding comprises: melting, converter, covering, leave standstill, degasification, casting, wherein, alloy melting temp is 745 DEG C ~ 755 DEG C, converter temperature is 730 DEG C ~ 740 DEG C, dwell temperature is 720 DEG C ~ 730 DEG C, hydrogen richness≤0.25 after degasification milliliter/100 grams of aluminium, casting temp is 680 DEG C ~ 685 DEG C, casting speed is 48 mm/min, and the monolithic ingot casting cooling water inflow in castingprocesses is 1000 liters/min ~ 1100 liters/min;
B, sawing, milling face are carried out to ingot casting, the both ends of the surface of first sawing ingot casting, then the upper and lower surface of ingot casting and side carry out milling faces, make surfacing flawless, wherein, the sawing amount at ingot casting two ends is 180 millimeters, the milling face amount of upper and lower surface is 10 millimeters, and the milling face amount of side is 8 millimeters;
The ingot casting of C, heating steps B gained, controlling Heating temperature is 460 DEG C, and heat-up time is 18 hours;
D, by heating after ingot casting through the hot roughing of multi-pass, the start rolling temperature of hot roughing is 455 DEG C, and finishing temperature is 382 DEG C; Again this sheet material is carried out hot finishing by continuous finishing train, the start rolling temperature of hot finishing is 376 DEG C, and finishing temperature is 338 DEG C, and the sheet metal thickness after finish rolling completes is 6.5 millimeters;
E, by curling for the sheet material of step D finish rolling gained, allow after its naturally cooling, obtain the aluminum magnesium alloy product of desired properties, in process of cooling, avoiding high wind to blowing;
Follow-up operation after step e, can be aligned cooled sheet material, and after sheet material aligning, longitudinal roughness is 0.18%, and horizontal roughness is 0.2%, carries out cutting after aligning by finished product requirement.
In order to test the performance of the aluminum magnesium alloy product of gained, from the material after aligning, intercept test samples, a part directly carries out mechanics properties testing, part baking 3 times, the temperature of each baking is 210 DEG C, and the time is 10 minutes, carries out mechanics properties testing again after baking.Detected result as shown in Table 3, high from the known product strength of the present invention of detected result, unit elongation is high, after baking, mechanical properties decrease is very little, before and after all reaching traffic baking, mechanics performance variation is very little, its Heat stability is good is described, the mechanical property of product all reaches the performance index manufacturing some particular component simultaneously.
Table three
Embodiment four:
The chemical composition of the aluminum magnesium alloy of the present embodiment and mass percent are: iron 0.26%, silicon 0.14%, copper 0.06%, manganese 0.3%, magnesium 5.5%, zinc 0.04%, titanium 0.05%, zirconium 0.11%, lanthanum 0.04%, sodium≤0.0005%, beryllium 0.0005% ~ 0.003%, all the other single impurity≤0.05%, all the other impurity adds up to≤0.15%, and surplus is aluminium.
A, by above-mentioned chemical composition and mass percent requirement batching after, founding becomes ingot casting, the processing step of founding comprises: melting, converter, covering, leave standstill, degasification, casting, wherein, alloy melting temp is 755 DEG C ~ 760 DEG C, converter temperature is 730 DEG C ~ 740 DEG C, dwell temperature is 730 DEG C ~ 740 DEG C, hydrogen richness≤0.25 after degasification milliliter/100 grams of aluminium, casting temp is 680 DEG C ~ 685 DEG C, casting speed is 50 mm/min, and the monolithic ingot casting cooling water inflow in castingprocesses is 900 liters/min ~ 1000 liters/min;
B, sawing, milling face are carried out to ingot casting, the both ends of the surface of first sawing ingot casting, then the upper and lower surface of ingot casting and side carry out milling faces, make surfacing flawless, wherein, the sawing amount at ingot casting two ends is 180 millimeters, the milling face amount of upper and lower surface is 12 millimeters, and the milling face amount of side is 10 millimeters;
The ingot casting of C, heating steps B gained, controlling Heating temperature is 450 DEG C, and heat-up time is 24 hours;
D, by heating after ingot casting through the hot roughing of multi-pass, the start rolling temperature of hot roughing is 440 DEG C, and finishing temperature is 370 DEG C; Again this sheet material is carried out hot finishing by continuous finishing train, the start rolling temperature of hot finishing is 360 DEG C, and finishing temperature is 330 DEG C, and the sheet metal thickness after finish rolling completes is 5 millimeters;
E, by curling for the sheet material of step D finish rolling gained, allow after its naturally cooling, obtain the aluminum magnesium alloy product of desired properties, in process of cooling, avoiding high wind to blowing;
Follow-up operation after step e, can be aligned cooled sheet material, and after sheet material aligning, longitudinal roughness is 0.2%, and horizontal roughness is 0.25%, carries out cutting after aligning by finished product requirement.
In order to test the performance of the aluminum magnesium alloy product of gained, from the material after aligning, intercept test samples, a part directly carries out mechanics properties testing, part baking 3 times, the temperature of each baking is 210 DEG C, and the time is 10 minutes, carries out mechanics properties testing again after baking.Detected result as shown in Table 4, high from the known product strength of the present invention of detected result, unit elongation is high, after baking, mechanical properties decrease is very little, before and after all reaching traffic baking, mechanics performance variation is very little, its Heat stability is good is described, the mechanical property of product all reaches the performance index manufacturing some particular component simultaneously.
Table four
Embodiment five:
The chemical composition of the aluminum magnesium alloy of the present embodiment and mass percent are: iron 0.2%, silicon 0.08%, copper 0.04%, manganese 0.6%, magnesium 4.7%, zinc 0.1%, titanium 0.05%, zirconium 0.15%, lanthanum 0.02%, sodium≤0.0005%, beryllium 0.0005% ~ 0.003%, all the other single impurity≤0.05%, all the other impurity adds up to≤0.15%, and surplus is aluminium.
A, by above-mentioned chemical composition and mass percent requirement batching after, founding becomes ingot casting, the processing step of founding comprises: melting, converter, covering, leave standstill, degasification, casting, wherein, alloy melting temp is 730 DEG C ~ 740 DEG C, converter temperature is 730 DEG C ~ 740 DEG C, dwell temperature is 720 DEG C ~ 730 DEG C, hydrogen richness≤0.25 after degasification milliliter/100 grams of aluminium, casting temp is 675 DEG C ~ 680 DEG C, casting speed is 45 mm/min, and the monolithic ingot casting cooling water inflow in castingprocesses is 1150 liters/min ~ 1250 liters/min;
B, sawing, milling face are carried out to ingot casting, the both ends of the surface of first sawing ingot casting, then the upper and lower surface of ingot casting and side carry out milling faces, make surfacing flawless, wherein, the sawing amount at ingot casting two ends is 170 millimeters, the milling face amount of upper and lower surface is 13 millimeters, and the milling face amount of side is 9 millimeters;
The ingot casting of C, heating steps B gained, controlling Heating temperature is 470 DEG C, and heat-up time is 12 hours;
D, by heating after ingot casting through the hot roughing of multi-pass, the start rolling temperature of hot roughing is 470 DEG C, and finishing temperature is 430 DEG C; Again this sheet material is carried out hot finishing by continuous finishing train, the start rolling temperature of hot finishing is 420 DEG C, and finishing temperature is 350 DEG C, and the sheet metal thickness after finish rolling completes is 9 millimeters;
E, by curling for the sheet material of step D finish rolling gained, allow after its naturally cooling, obtain the aluminum magnesium alloy product of desired properties, in process of cooling, avoiding high wind to blowing;
Follow-up operation after step e, can be aligned cooled sheet material, and after sheet material aligning, longitudinal roughness is 0.2%, and horizontal roughness is 0.3%, carries out cutting after aligning by finished product requirement.
In order to test the performance of the aluminum magnesium alloy product of gained, from the material after aligning, intercept test samples, a part directly carries out mechanics properties testing, part baking 3 times, the temperature of each baking is 210 DEG C, and the time is 10 minutes, carries out mechanics properties testing again after baking.Detected result as shown in Table 5, high from the known product strength of the present invention of detected result, unit elongation is high, after baking, mechanical properties decrease is very little, before and after all reaching traffic baking, mechanics performance variation is very little, its Heat stability is good is described, the mechanical property of product all reaches the performance index manufacturing some particular component simultaneously.
Table five
Comparative example one:
When this comparative example is not for adding zirconium, lanthanon, produce 6.5 mm thick aluminum magnesium alloy products, its preparation process is:
A, alloy composition and mass percent are pressed following requirements batching, iron 0.24%, silicon 0.16%, copper 0.03%, manganese 0.37%, magnesium 4.7%, zinc 0.05%, titanium 0.06%, sodium≤0.0005%, beryllium 0.0005% ~ 0.003%, all the other single impurity≤0.05%, all the other impurity adds up to≤0.15%, surplus is aluminium, after having prepared burden, founding becomes ingot casting, the processing step of founding comprises: melting, converter, cover, leave standstill, degasification, casting, wherein, alloy melting temp is 745 DEG C ~ 755 DEG C, converter temperature is 730 DEG C ~ 740 DEG C, dwell temperature is 720 DEG C ~ 730 DEG C, hydrogen richness≤0.25 after degasification milliliter/100 grams of aluminium, casting temp is 680 DEG C ~ 685 DEG C, casting speed is 48 mm/min, monolithic ingot casting cooling water inflow in castingprocesses is 1000 liters/min ~ 1100 liters/min,
B, sawing, milling face are carried out to ingot casting, the both ends of the surface of first sawing ingot casting, then the upper and lower surface of ingot casting and side carry out milling faces, make surfacing flawless, wherein, the sawing amount at ingot casting two ends is 180 millimeters, the milling face amount of upper and lower surface is 10 millimeters, and the milling face amount of side is 8 millimeters;
The ingot casting of C, heating steps B gained, controlling Heating temperature is 460 DEG C, and heat-up time is 18 hours;
D, by heating after ingot casting through the hot roughing of multi-pass, the start rolling temperature of hot roughing is 455 DEG C, and finishing temperature is 382 DEG C; Again this sheet material is carried out hot finishing by continuous finishing train, the start rolling temperature of hot finishing is 376 DEG C, and finishing temperature is 338 DEG C, and the sheet metal thickness after finish rolling completes is 6.5 millimeters;
E, by curling for the sheet material of step D finish rolling gained, allow after its naturally cooling, obtain the aluminum magnesium alloy product of desired properties, in process of cooling, avoiding high wind to blowing;
Follow-up operation after step e, can be aligned cooled sheet material, and after sheet material aligning, longitudinal roughness is 0.17%, and horizontal roughness is 0.2%, carries out cutting after aligning by finished product requirement.
In order to test the performance of the aluminum magnesium alloy product of gained, sampling and toasting from the product cut out, toast 3 times, the temperature of each baking is 250 DEG C, and the time is 10 minutes.
Product before baking and after baking is sampled and carries out mechanics properties testing, detected result is as table six, product strength, the unit elongation produced from the production technology before the known invention of detected result all can not meet the demands, and after baking, strength degradation is comparatively large, and stability is relatively poor.
Table six
Known by the performance of comparative example and comparative example product, the product that the present invention produces has good mechanical property and thermal stability, meets the manufacture requirements of some particular component in transportation.
Claims (6)
1. an aluminum magnesium alloy, it is characterized in that being made up of the chemical composition of following masses per-cent: iron <0.3%, silicon <0.2%, copper <0.1%, manganese 0.3% ~ 0.6%, magnesium 4.7 ~ 5.5%, zinc≤0.1%, titanium <0.1%, zirconium 0.05 ~ 0.15%, lanthanon <0.05%, sodium≤0.0005%, beryllium 0.0005% ~ 0.003%, all the other single impurity≤0.05%, all the other impurity adds up to≤0.15%, and surplus is aluminium; Wherein lanthanon is one or more elements in lanthanum, cerium, praseodymium, erbium.
2. a preparation method for aluminium-magnesium alloy sheet, is characterized in that:
Adopt the chemical composition of following mass percent:
Iron <0.3%, silicon <0.2%, copper <0.1%, manganese 0.3% ~ 0.6%, magnesium 4.7 ~ 5.5%, zinc≤0.1%, titanium <0.1%, zirconium 0.05 ~ 0.15%, lanthanon <0.05%, sodium≤0.0005%, beryllium 0.0005% ~ 0.003%, all the other single impurity≤0.05%, all the other impurity adds up to≤0.15%, and surplus is aluminium; Wherein lanthanon is one or more elements in lanthanum, cerium, praseodymium, erbium;
Its preparation is carried out according to the following steps:
A, by above-mentioned chemical composition and mass percent requirement batching after, founding becomes ingot casting;
B, sawing, milling face are carried out to ingot casting, make surfacing flawless;
The ingot casting of C, heating steps B gained, controlling Heating temperature is 450 DEG C ~ 470 DEG C, and heat-up time is 12 hours ~ 24 hours;
D, carry out hot roughing to the ingot casting after heating, then carry out hot finishing, the finishing temperature of hot finishing is 330 DEG C ~ 350 DEG C;
E, by after curling for the sheet material of step D gained, naturally cooling.
3. the preparation method of aluminium-magnesium alloy sheet according to claim 2, it is characterized in that: in steps A, founding becomes the processing step of ingot casting to comprise: melting, converter, cover, leave standstill, degasification, casting, wherein, alloy melting temp is 730 DEG C ~ 760 DEG C, converter temperature is 730 DEG C ~ 740 DEG C, dwell temperature is 720 DEG C ~ 740 DEG C, hydrogen richness≤0.25 after degasification milliliter/100 grams of aluminium, casting temp is 675 DEG C ~ 685 DEG C, casting speed is 45 mm/min ~ 50 mm/min, monolithic ingot casting cooling water inflow in castingprocesses is 900 liters/min ~ 1250 liters/min.
4. the preparation method of aluminium-magnesium alloy sheet according to claim 2, it is characterized in that: in step B, the both ends of the surface of first sawing ingot casting, again the upper and lower surface of ingot casting and side carry out milling faces, the sawing amount at described ingot casting two ends is greater than 150 millimeters, the milling face amount of upper and lower surface is greater than 10 millimeters, and the milling face amount of side is greater than 6 millimeters.
5. the preparation method of the aluminium-magnesium alloy sheet according to any one of claim 2 to 4 claim, is characterized in that: in step D, and the start rolling temperature of hot roughing is 440 DEG C ~ 470 DEG C, and finishing temperature is 370 DEG C ~ 430 DEG C; The start rolling temperature of hot finishing is 360 DEG C ~ 420 DEG C, and the sheet metal thickness after finish rolling completes is 5 millimeters ~ 9 millimeters.
6. the preparation method of aluminium-magnesium alloy sheet according to claim 5, is characterized in that: after step e, aligns cooled sheet material, and after sheet material aligning, longitudinal roughness is not more than 0.3%, and horizontal roughness is not more than 0.4%.
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