CN101914710A - Aluminum alloy sheet for high-speed train structure and manufacture thereof - Google Patents
Aluminum alloy sheet for high-speed train structure and manufacture thereof Download PDFInfo
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Abstract
The invention relates to an aluminum alloy sheet for a high-speed train structure and a manufacture thereof, in particular to an aluminum alloy sheet and a manufacture thereof. The sheet of the invention is prepared from the following elements: Zn, Mg, Mn, Cr, Zr, V, Cu, Si, Fe, Ti and Al. The preparation method comprises the following steps of: (1) weighting raw materials; (2) melting; (3) casting; (4) homogenized annealing; (5) hot rolling; (6) cold rolling; (7) quenching; and (8) one-stage ageing treatment. The aluminum alloy sheet for the high-speed train structure has the tensile strength of 410-425 Rm/N/mm<2>, the yield strength of 360-382 RP0.2/N/mm<2> and the elongation rate of 12.2-13.4 percent.
Description
Technical field
The present invention relates to a kind of aluminum alloy plate materials and manufacture method thereof.
Background technology
The 7N01 aluminium alloy belongs to the Al-Zn-Mg line aluminium alloy, and this alloy is owing to have higher intensity, good anti-corrosion and weldability, high comprehensive performance, and Japanese express locomotive is used more to this material.The present domestic manufacturer production 7N01 aluminum alloy materials that also do not have does not have molding production process can use for reference reference.For many years, it is that alloy has carried out some researchs that China's centering can be welded Al-Zn-Mg by force, but be mostly imitated, still do not form the complete alloy system that can satisfy various bullet train manufacturing requirements, be aspect the optimizing components of alloy at Al-Zn-Mg, alloy metallurgy quality control aspect, aspect such as materials processing and thermal treatment also lacks systematic study, therefore also have many critical technical problems not to be resolved, be difficult to stably can weld the Al-Zn-Mg sheet alloy by force in high performance for the High Speed Train in China manufacturing provides.
Summary of the invention
The purpose of this invention is to provide a kind of aluminum alloy sheet for high-speed train structure and manufacture method thereof.
Each element mass percent is as follows in the aluminum alloy sheet for high-speed train structure of the present invention: Zn:3.5～6.0%, Mg:1.2～3.0%, Mn:0.3～0.9%, Cr＜0.4%, Zr＜0.45%, V＜0.15%, Cu＜0.30%, Si＜0.30%, Fe＜0.35%, Ti≤0.2%, single impurity≤0.05%, add up to impurity≤0.15%, all the other are Al, and the mass percent of mass percent＞Si of Fe.
The manufacture method of aluminum alloy sheet for high-speed train structure is as follows: the one-level waste material that, takes by weighing fine aluminium ingot, pure magnesium ingot, pure zinc ingot, aluminium manganese master alloy, Lv Chrome master alloy, aluminium vanadium master alloy, aluminium titanium master alloy, magnesium zirconium master alloy, aluminium Ti, B grain graining agent and aluminum alloy sheet for high-speed train structure according to each element mass percent in the above-mentioned aluminum alloy sheet for high-speed train structure; Two, melting: adopt electric furnace to haul oneself willingly into the one-level waste material of solid material mode with aluminum alloy sheet for high-speed train structure, the fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy Lv Chrome master alloy, aluminium vanadium master alloy and aluminium titanium master alloy join in the smelting furnace, treat to imbed pure magnesium ingot after the furnace charge fusing, melting 8h～10h under 720 ℃～760 ℃ condition, obtain aluminium alloy melt, and add magnesium zirconium master alloy when temperature reaches 740 ℃ in stove, press 0.5%～0.6% adding insulating covering agent of metal quality in the furnace then, the mass content of mass content＞Si of Fe, and watering down when the mass content of Cu in the aluminium alloy melt＞0.15%, is 31～33.5: 1 Ar-Cl then with the volume ratio of argon gas and chlorine with aluminium alloy melt
2The mixed gas refining is left standstill 30min to the per 100 hydrogen richness≤0.2ml that restrain in the melts, obtains molten aluminium alloy; Three, casting: the inwall that will have the crystallizer of water baffle plate device sticks one deck thermal isolation film, and the aluminium Ti, B grain graining agent placed chute upper end, in the time of cast aluminium titanium boron wire being inserted the element that makes in the chute in the aluminium Ti, B grain graining agent evenly fuses in the molten aluminium alloy, open online degasifying device then, pouring the melt after the fusing of fine aluminium ingot on crystallizer base shop fixtures, is 710 ℃～725 ℃ in temperature then, hydraulic pressure is 0.08～0.15MPa, speed is that under the condition of 45～50mm/min the molten aluminium alloy of step 2 gained to be cast as thickness be 340mm, width is 1200mm, length is the alloy cast ingot of 4000mm～5000mm; Four, homogenizing annealing: the alloy cast ingot that step 3 is obtained is under 460～470 ℃ the condition, to be incubated 24 hours in temperature; Five, hot rolling: will mill face to 290mm～300mm through the alloy cast ingot that step 4 is handled, be 360～420 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, to be rolled into the thick hot-rolled sheet of 8mm～6mm; Six, cold rolling: as after the hot-rolled sheet that 8mm～6mm is thick is handled through 300 ℃～380 ℃, the process annealing of 1h, to be rolled to the cold rolled sheet of required specification; Seven, quench: be under 470 ± 2 ℃ the condition in quenching temperature, thickness is adopted roller greater than the cold rolled sheet of 6.3mm at the bottom of stove quench, carry out deflection again and be 1.2%～2.2% preliminary draft, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Be under 470 ± 2 ℃ the condition in quenching temperature, adopt salt bath to quench less than the cold rolled sheet of 6.3mm thickness, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Eight, single-stage aging is handled: is that 120 ℃, soaking time are 24 hours ageing treatment with the aluminum alloy sheet for high-speed train structure of T4 state through excess temperature, obtains the aluminum alloy sheet for high-speed train structure of T6 state; Aluminium Ti, B grain graining agent described in the step 1 is the Al-5Ti-1B alloy; Insulating covering agent described in the step 2 is No. 2 flux.
The tensile strength of aluminum alloy sheet for high-speed train structure of the present invention is 410～425R
m/ N/mm
2, yield strength is 360～382R
P0.2/ N/mm
2, unit elongation is 12.2～13.4%.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: present embodiment high speed train composition spare is as follows with each element mass percent in the aluminum alloy plate materials: Zn:3.5～6.0%, Mg:1.2～3.0%, Mn:0.3～0.9%, Cr＜0.4%, Zr＜0.45%, V＜0.15%, Cu＜0.30%, Si＜0.30%, Fe＜0.35%, Ti≤0.2%, single impurity≤0.05%, add up to impurity≤0.15%, all the other are Al, and the mass percent of mass percent＞Si of Fe.
Embodiment two: what present embodiment and embodiment one were different is that present embodiment high speed train composition spare is as follows with each element mass percent in the aluminum alloy plate materials: Zn:3.5%, Mg:1.2%, Mn:0.3%, Cr＜0.4%, Zr＜0.45%, V＜0.15%, Cu＜0.30%, Si＜0.30%, Fe＜0.35%, Ti≤0.2%, single impurity≤0.05%, add up to impurity≤0.15%, all the other are Al, and the mass percent of mass percent＞Si of Fe.
Embodiment three: present embodiment high speed train composition spare is as follows with each element mass percent in the aluminum alloy plate materials: Zn:6.0%, Mg:3.0%, Mn:0.9%, Cr＜0.4%, Zr＜0.45%, V＜0.15%, Cu＜0.30%, Si＜0.30%, Fe＜0.35%, Ti＜0.2%, single impurity≤0.05%, add up to impurity≤0.15%, all the other are Al, and the mass percent of mass percent＞Si of Fe.
Embodiment four: what present embodiment and embodiment one were different is that present embodiment high speed train composition spare is as follows with each element mass percent in the aluminum alloy plate materials: Zn:5.0%, Mg:2.4%, Mn:0.7%, Cr＜0.4%, Zr＜0.45%, V＜0.15%, Cu＜0.30%, Si＜0.30%, Fe＜0.35%, Ti≤0.2%, single impurity≤0.05%, add up to impurity≤0.15%, all the other are Al, and the mass percent of mass percent＞Si of Fe.
Embodiment five: present embodiment high speed train composition spare is as follows with the manufacture method of aluminum alloy plate materials: the one-level waste material that, takes by weighing fine aluminium ingot, pure magnesium ingot, pure zinc ingot, aluminium manganese master alloy, Lv Chrome master alloy, aluminium vanadium master alloy, aluminium titanium master alloy, magnesium zirconium master alloy, aluminium Ti, B grain graining agent and aluminum alloy sheet for high-speed train structure according to each element mass percent in the aluminum alloy sheet for high-speed train structure described in the embodiment one; Two, melting: adopt electric furnace to haul oneself willingly into the one-level waste material of solid material mode with aluminum alloy sheet for high-speed train structure, the fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy Lv Chrome master alloy, aluminium vanadium master alloy and aluminium titanium master alloy join in the smelting furnace, treat to imbed pure magnesium ingot after the furnace charge fusing, melting 8h～10h under 720 ℃～760 ℃ condition, obtain aluminium alloy melt, and add magnesium zirconium master alloy when temperature reaches 740 ℃ in stove, press 0.5%～0.6% adding insulating covering agent of metal quality in the furnace then, the mass content of mass content＞Si of Fe, and watering down when the mass content of Cu in the aluminium alloy melt＞0.15%, is 31～33.5: 1 Ar-Cl then with the volume ratio of argon gas and chlorine with aluminium alloy melt
2The mixed gas refining is left standstill 30min to the per 100 hydrogen richness≤0.2ml that restrain in the melts, obtains molten aluminium alloy; Three, casting: the inwall that will have the crystallizer of water baffle plate device sticks one deck thermal isolation film, and the aluminium Ti, B grain graining agent placed chute upper end, in the time of cast aluminium titanium boron wire being inserted the element that makes in the chute in the aluminium Ti, B grain graining agent evenly fuses in the molten aluminium alloy, open online degasifying device then, pouring the melt after the fusing of fine aluminium ingot on crystallizer base shop fixtures, is 710 ℃～725 ℃ in temperature then, hydraulic pressure is 0.08～0.15MPa, speed is that under the condition of 45～50mm/min the molten aluminium alloy of step 2 gained to be cast as thickness be 340mm, width is 1200mm, length is the alloy cast ingot of 4000mm～5000mm; Four, homogenizing annealing: the alloy cast ingot that step 3 is obtained is under 460～470 ℃ the condition, to be incubated 24 hours in temperature; Five, hot rolling: will mill face to 290mm～300mm through the alloy cast ingot that step 4 is handled, be 360～420 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, to be rolled into the thick hot-rolled sheet of 8mm～6mm; Six, cold rolling: as after the hot-rolled sheet that 8mm～6mm is thick is handled through 300 ℃～380 ℃, the process annealing of 1h, to be rolled to the cold rolled sheet of required specification; Seven, quench: be under 470 ± 2 ℃ the condition in quenching temperature, thickness is adopted roller greater than the cold rolled sheet of 6.3mm at the bottom of stove quench, carry out deflection again and be 1.2%～2.2% preliminary draft, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Be under 470 ± 2 ℃ the condition in quenching temperature, adopt salt bath to quench less than the cold rolled sheet of 6.3mm thickness, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Eight, single-stage aging is handled: is that 120 ℃, soaking time are 24 hours ageing treatment with the aluminum alloy sheet for high-speed train structure of T4 state through excess temperature, obtains the aluminum alloy sheet for high-speed train structure of T6 state.
The over-all properties such as the table 1 of the aluminum alloy sheet for high-speed train structure of present embodiment gained T6 state:
Table 1
Embodiment six: what present embodiment and embodiment five were different is that the aluminium Ti, B grain graining agent described in the step 1 is the Al-5Ti-1B alloy.Other is identical with embodiment five.
Embodiment seven: what present embodiment was different with one of embodiment five or six is that the insulating covering agent described in the step 2 is No. 2 flux.Other is identical with one of embodiment five or six.
Embodiment eight: present embodiment is different with one of embodiment five to seven be in the step 2 insulating covering agent add-on be in the furnace metal quality 0.55%.Other is identical with one of embodiment five to seven.
Embodiment nine: that present embodiment is different with one of embodiment five to eight is Ar-Cl in the step 2
2The volume ratio of argon gas and chlorine is 31.5～33: 1 in the mixed gas.Other is identical with one of embodiment five to eight.
Embodiment ten: that present embodiment is different with one of embodiment five to nine is Ar-Cl in the step 2
2The volume ratio of argon gas and chlorine is 32: 1 in the mixed gas.Other is identical with one of embodiment five to nine.
Embodiment 11: present embodiment high speed train composition spare is as follows with the manufacture method of aluminum alloy plate materials: the one-level waste material that, takes by weighing fine aluminium ingot, pure magnesium ingot, pure zinc ingot, aluminium manganese master alloy, Lv Chrome master alloy, aluminium vanadium master alloy, aluminium titanium master alloy, magnesium zirconium master alloy, aluminium Ti, B grain graining agent and aluminum alloy sheet for high-speed train structure according to each element mass percent in the aluminum alloy sheet for high-speed train structure described in the embodiment one; Two, melting: adopt electric furnace to haul oneself willingly into the one-level waste material of solid material mode with aluminum alloy sheet for high-speed train structure, the fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy Lv Chrome master alloy, aluminium vanadium master alloy and aluminium titanium master alloy join in the smelting furnace, treat to imbed pure magnesium ingot after the furnace charge fusing, melting 8h under 720 ℃～760 ℃ condition, obtain aluminium alloy melt, and add magnesium zirconium master alloy when temperature reaches 740 ℃ in stove, press 0.5% adding insulating covering agent of metal quality in the furnace then, the mass content of mass content＞Si of Fe, and watering down when the mass content of Cu in the aluminium alloy melt＞0.15%, is 31: 1 Ar-Cl then with the volume ratio of argon gas and chlorine with aluminium alloy melt
2The mixed gas refining is left standstill 30min to the per 100 hydrogen richness≤0.2ml that restrain in the melts, obtains molten aluminium alloy; Three, casting: the inwall that will have the crystallizer of water baffle plate device sticks one deck thermal isolation film, and the aluminium Ti, B grain graining agent placed chute upper end, in the time of cast aluminium titanium boron wire being inserted the element that makes in the chute in the aluminium Ti, B grain graining agent evenly fuses in the molten aluminium alloy, open online degasifying device then, pouring the melt after the fusing of fine aluminium ingot on crystallizer base shop fixtures, is 710 ℃～725 ℃ in temperature then, hydraulic pressure is 0.08～0.15MPa, speed is that under the condition of 45mm/min the molten aluminium alloy of step 2 gained to be cast as thickness be 340mm, width is 1200mm, length is the alloy cast ingot of 4000mm～5000mm; Four, homogenizing annealing: the 7N01 alloy cast ingot that step 3 is obtained is under 460 ℃ the condition, to be incubated 24 hours in temperature; Five, hot rolling: will mill face to 290mmmm through the alloy cast ingot that step 4 is handled, be 360～400 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, to be rolled into the thick hot-rolled sheet of 8mm～6mm; Six, cold rolling: as after the hot-rolled sheet that 8mm～6mm is thick is handled through 300 ℃, the process annealing of 1h, to be rolled to the cold rolled sheet of required specification; Seven, quench: be under 470 ℃ the condition in quenching temperature, thickness is adopted roller greater than the cold rolled sheet of 6.3mm at the bottom of stove quench, carry out deflection again and be 1.2% preliminary draft, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Be under 470 ℃ the condition in quenching temperature, adopt salt bath to quench less than the cold rolled sheet of 6.3mm thickness, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Eight, single-stage aging is handled: is that 120 ℃, soaking time are 24 hours ageing treatment with the aluminum alloy sheet for high-speed train structure of T4 state through excess temperature, obtains the aluminum alloy sheet for high-speed train structure of T6 state.
Embodiment 12: present embodiment high speed train composition spare is as follows with the manufacture method of aluminum alloy plate materials: the one-level waste material that, takes by weighing fine aluminium ingot, pure magnesium ingot, pure zinc ingot, aluminium manganese master alloy, Lv Chrome master alloy, aluminium vanadium master alloy, aluminium titanium master alloy, magnesium zirconium master alloy, aluminium Ti, B grain graining agent and aluminum alloy sheet for high-speed train structure according to each element mass percent in the aluminum alloy sheet for high-speed train structure described in the embodiment one; Two, melting: adopt electric furnace to haul oneself willingly into the one-level waste material of solid material mode with aluminum alloy sheet for high-speed train structure, the fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy Lv Chrome master alloy, aluminium vanadium master alloy and aluminium titanium master alloy join in the smelting furnace, treat to imbed pure magnesium ingot after the furnace charge fusing, melting 10h under 720 ℃～760 ℃ condition, obtain aluminium alloy melt, and add magnesium zirconium master alloy when temperature reaches 740 ℃ in stove, press 0.6% adding insulating covering agent of metal quality in the furnace then, the mass content of mass content＞Si of Fe, and watering down when the mass content of Cu in the aluminium alloy melt＞0.15%, is 33.5: 1 Ar-Cl then with the volume ratio of argon gas and chlorine with aluminium alloy melt
2The mixed gas refining is left standstill 30min to the per 100 hydrogen richness≤0.2ml that restrain in the melts, obtains molten aluminium alloy; Three, casting: the inwall that will have the crystallizer of water baffle plate device sticks one deck thermal isolation film, and the aluminium Ti, B grain graining agent placed chute upper end, in the time of cast aluminium titanium boron wire being inserted the element that makes in the chute in the aluminium Ti, B grain graining agent evenly fuses in the molten aluminium alloy, open online degasifying device then, pouring the melt after the fusing of fine aluminium ingot on crystallizer base shop fixtures, is 710 ℃～725 ℃ in temperature then, hydraulic pressure is 0.08～0.15MPa, speed is that under the condition of 50mm/min the molten aluminium alloy of step 2 gained to be cast as thickness be 340mm, width is 1200mm, length is the alloy cast ingot of 4000mm～5000mm; Four, homogenizing annealing: the alloy cast ingot that step 3 is obtained is under 460～470 ℃ the condition, to be incubated 24 hours in temperature; Five, hot rolling: will mill face to 300mm through the 7N01 alloy cast ingot that step 4 is handled, be 360～420 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, to be rolled into the thick hot-rolled sheet of 8mm～6mm; Six, cold rolling: as after the hot-rolled sheet that 8mm～6mm is thick is handled through 300 ℃～380 ℃, the process annealing of 1h, to be rolled to the cold rolled sheet of required specification; Seven, quench: be under 472 ℃ the condition in quenching temperature, thickness is adopted roller greater than the cold rolled sheet of 6.3mm at the bottom of stove quench, carry out deflection again and be 1.2%～2.2% preliminary draft, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Be under 472 ℃ the condition in quenching temperature, adopt salt bath to quench less than the cold rolled sheet of 6.3mm thickness, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Eight, single-stage aging is handled: is that 120 ℃, soaking time are 24 hours ageing treatment with the aluminum alloy sheet for high-speed train structure of T4 state through excess temperature, obtains the aluminum alloy sheet for high-speed train structure of T6 state.
Claims (7)
1. aluminum alloy sheet for high-speed train structure is characterized in that each element mass percent is as follows in the described aluminum alloy sheet for high-speed train structure: Zn:3.5～6.0%, Mg:1.2～3.0%, Mn:0.3～0.9%, Cr＜0.4%, Zr＜0.45%, V＜0.15%, Cu＜0.30%, Si＜0.30%, Fe＜0.35%, Ti≤0.2%, single impurity≤0.05% adds up to impurity≤0.15%, all the other are Al, and the mass percent of mass percent＞Si of Fe.
2. according to the described aluminum alloy sheet for high-speed train structure of claim 1, it is characterized in that each element mass percent is as follows in the described aluminum alloy sheet for high-speed train structure: Zn:5.0%, Mg:2.4%, Mn:0.7%, Cr＜0.4%, Zr＜0.45%, V＜0.15%, Cu＜0.30%, Si＜0.30%, Fe＜0.35%, Ti≤0.2%, single impurity≤0.05% adds up to impurity≤0.15%, all the other are Al, and the mass percent of mass percent＞Si of Fe.
3. the manufacture method of the described aluminum alloy sheet for high-speed train structure of claim 1 is characterized in that the manufacture method of aluminum alloy sheet for high-speed train structure is as follows: the one-level waste material that, takes by weighing fine aluminium ingot, pure magnesium ingot, pure zinc ingot, aluminium manganese master alloy, Lv Chrome master alloy, aluminium vanadium master alloy, aluminium titanium master alloy, magnesium zirconium master alloy, aluminium Ti, B grain graining agent and aluminum alloy sheet for high-speed train structure according to each element mass percent in the aluminum alloy sheet for high-speed train structure described in the claim 1; Two, melting: adopt electric furnace to haul oneself willingly into the one-level waste material of solid material mode with aluminum alloy sheet for high-speed train structure, the fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy Lv Chrome master alloy, aluminium vanadium master alloy and aluminium titanium master alloy join in the smelting furnace, treat to imbed pure magnesium ingot after the furnace charge fusing, melting 8h～10h under 720 ℃～760 ℃ condition, obtain aluminium alloy melt, and add magnesium zirconium master alloy when temperature reaches 740 ℃ in stove, press 0.5%～0.6% adding insulating covering agent of metal quality in the furnace then, the mass content of mass content＞Si of Fe, and watering down when the mass content of Cu in the aluminium alloy melt＞0.15%, is 31～33.5: 1 Ar-Cl then with the volume ratio of argon gas and chlorine with aluminium alloy melt
2The mixed gas refining is left standstill 30min to the per 100 hydrogen richness≤0.2ml that restrain in the melts, obtains molten aluminium alloy; Three, casting: the inwall that will have the crystallizer of water baffle plate device sticks one deck thermal isolation film, and the aluminium Ti, B grain graining agent placed chute upper end, in the time of cast aluminium titanium boron wire being inserted the element that makes in the chute in the aluminium Ti, B grain graining agent evenly fuses in the molten aluminium alloy, open online degasifying device then, pouring the melt after the fusing of fine aluminium ingot on crystallizer base shop fixtures, is 710 ℃～725 ℃ in temperature then, hydraulic pressure is 0.08～0.15MPa, speed is that under the condition of 45～50mm/min the molten aluminium alloy of step 2 gained to be cast as thickness be 340mm, width is 1200mm, length is the alloy cast ingot of 4000mm～5000mm; Four, homogenizing annealing: the alloy cast ingot that step 3 is obtained is under 460～470 ℃ the condition, to be incubated 24 hours in temperature; Five, hot rolling: will mill face to 290mm～300mm through the alloy cast ingot that step 4 is handled, be 360～420 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, to be rolled into the thick hot-rolled sheet of 8mm～6mm; Six, cold rolling: as after the hot-rolled sheet that 8mm～6mm is thick is handled through 300 ℃～380 ℃, the process annealing of 1h, to be rolled to the cold rolled sheet of required specification; Seven, quench: be under 470 ± 2 ℃ the condition in quenching temperature, thickness is adopted roller greater than the cold rolled sheet of 6.3mm at the bottom of stove quench, carry out deflection again and be 1.2%～2.2% preliminary draft, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Be under 470 ± 2 ℃ the condition in quenching temperature, adopt salt bath to quench less than the cold rolled sheet of 6.3mm thickness, obtain the aluminum alloy sheet for high-speed train structure of T4 state; Eight, single-stage aging is handled: is that 120 ℃, soaking time are 24 hours ageing treatment with the aluminum alloy sheet for high-speed train structure of T4 state through excess temperature, obtains the aluminum alloy sheet for high-speed train structure of T6 state.
4. according to the manufacture method of the described aluminum alloy sheet for high-speed train structure of claim 3, it is characterized in that the aluminium Ti, B grain graining agent described in the step 1 is the Al-5Ti-1B alloy.
5. according to the manufacture method of claim 3 or 4 described aluminum alloy sheet for high-speed train structure, it is characterized in that the insulating covering agent described in the step 2 is No. 2 flux.
6. according to the manufacture method of the described aluminum alloy sheet for high-speed train structure of claim 5, it is characterized in that insulating covering agent add-on in the step 2 be in the furnace metal quality 0.55%.
7. according to the manufacture method of claim 3,4 or 6 described aluminum alloy sheet for high-speed train structure, it is characterized in that Ar-Cl in the step 2
2The volume ratio of argon gas and chlorine is 31.5～33: 1 in the mixed gas.
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