CN101914710B - Manufacture method of aluminum alloy sheet for high-speed train structure - Google Patents
Manufacture method of aluminum alloy sheet for high-speed train structure Download PDFInfo
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- CN101914710B CN101914710B CN201010283217XA CN201010283217A CN101914710B CN 101914710 B CN101914710 B CN 101914710B CN 201010283217X A CN201010283217X A CN 201010283217XA CN 201010283217 A CN201010283217 A CN 201010283217A CN 101914710 B CN101914710 B CN 101914710B
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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 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 method of manufacture of aluminum alloy plate materials.
Background technology
The 7N01 duraluminum belongs to the Al-Zn-Mg line aluminium alloy, and this alloy is owing to have higher intensity, good anti-corrosion and weldableness, 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 being mostly imitated, still forming the complete alloy system can satisfy various bullet train manufacturing requirements, is aspect the optimizing components of alloy at Al-Zn-Mg; Alloy metallurgy quality control aspect; Therefore aspect such as materials processed and thermal treatment also lacks systematic study, also has many critical technical problems not to be resolved, and is difficult to stably can weld the Al-Zn-Mg sheet alloy for the High Speed Train in China manufacturing provides by force in high performance.
Summary of the invention
The method of manufacture that the purpose of this invention is to provide a kind of aluminum alloy sheet for high-speed train structure.
Each element mass percent is following 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 method of manufacture of aluminum alloy sheet for high-speed train structure is following: the one-level waste material that, takes by weighing fine aluminium ingot, pure magnesium ingot, pure zinc ingot, aluminium manganese master alloy, aluminium chromium hardener, 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 solid material mode one-level waste material, fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy, aluminium chromium hardener, aluminium vanadium master alloy and the aluminium titanium master alloy of aluminum alloy sheet for high-speed train structure joined 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 when the mass content of Cu in the aluminium alloy melt＞0.15%, water down, then aluminium alloy melt being used the volume ratio of argon gas and chlorine is 31～33.5: 1 Ar-Cl
2Hydrogen richness≤0.2ml in mixed gas refining to per 100 gram melts leaves standstill 30min, obtains molten aluminium alloy; Three, casting: the inwall that will have the mold 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 fine aluminium ingot fusing on mold base shop fixtures, is that 710 ℃～725 ℃, hydraulic pressure are that 0.08～0.15MPa, speed are that to be cast as thickness be that 340mm, width are that 1200mm, length are the alloy cast ingot of 4000mm～5000mm with adding the molten aluminium alloy that forms behind the aluminium Ti, B grain graining agent under the condition of 45～50mm/min in temperature then; 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: the alloy cast ingot that will pass through the step 4 processing mills face to 290mm～300mm, is 360～420 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, is 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, ys is 360～382R
P0.2/ N/mm
2, unit elongation is 12.2～13.4%.
Embodiment
Technical scheme of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: this embodiment high speed train composition spare is following 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 this embodiment and embodiment one were different is that this embodiment high speed train composition spare is following 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: this embodiment high speed train composition spare is following 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 this embodiment and embodiment one were different is that this embodiment high speed train composition spare is following 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: this embodiment high speed train composition spare is following with the method for manufacture 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, aluminium chromium hardener, 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 solid material mode one-level waste material, fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy, aluminium chromium hardener, aluminium vanadium master alloy and the aluminium titanium master alloy of aluminum alloy sheet for high-speed train structure joined 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 when the mass content of Cu in the aluminium alloy melt＞0.15%, water down, then aluminium alloy melt being used the volume ratio of argon gas and chlorine is 31～33.5: 1 Ar-Cl
2Hydrogen richness≤0.2ml in mixed gas refining to per 100 gram melts leaves standstill 30min, obtains molten aluminium alloy; Three, casting: the inwall that will have the mold 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 fine aluminium ingot fusing on mold base shop fixtures, is that 710 ℃～725 ℃, hydraulic pressure are that 0.08～0.15MPa, speed are that to be cast as thickness be that 340mm, width are that 1200mm, length are the alloy cast ingot of 4000mm～5000mm with adding the molten aluminium alloy that forms behind the aluminium Ti, B grain graining agent under the condition of 45～50mm/min in temperature then; 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: the alloy cast ingot that will pass through the step 4 processing mills face to 290mm～300mm, is 360～420 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, is 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 this embodiment gained T6 state:
Table 1
Embodiment six: what this 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 this 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: this 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 this 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 this 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: this embodiment high speed train composition spare is following with the method for manufacture 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, aluminium chromium hardener, 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 solid material mode one-level waste material, fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy, aluminium chromium hardener, aluminium vanadium master alloy and the aluminium titanium master alloy of aluminum alloy sheet for high-speed train structure joined 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 when the mass content of Cu in the aluminium alloy melt＞0.15%, water down, then aluminium alloy melt being used the volume ratio of argon gas and chlorine is 31: 1 Ar-Cl
2Hydrogen richness≤0.2ml in mixed gas refining to per 100 gram melts leaves standstill 30min, obtains molten aluminium alloy; Three, casting: the inwall that will have the mold 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 fine aluminium ingot fusing on mold base shop fixtures, is that 710 ℃～725 ℃, hydraulic pressure are that 0.08～0.15MPa, speed are that to be cast as thickness be that 340mm, width are that 1200mm, length are the alloy cast ingot of 4000mm～5000mm with adding the molten aluminium alloy that forms behind the aluminium Ti, B grain graining agent under the condition of 45mm/min in temperature then; 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: the alloy cast ingot that will pass through the step 4 processing mills face to 290mmmm, is 360～400 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, is 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: this embodiment high speed train composition spare is following with the method for manufacture 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, aluminium chromium hardener, 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 solid material mode one-level waste material, fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy, aluminium chromium hardener, aluminium vanadium master alloy and the aluminium titanium master alloy of aluminum alloy sheet for high-speed train structure joined 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 when the mass content of Cu in the aluminium alloy melt＞0.15%, water down, then aluminium alloy melt being used the volume ratio of argon gas and chlorine is 33.5: 1 Ar-Cl
2Hydrogen richness≤0.2ml in mixed gas refining to per 100 gram melts leaves standstill 30min, obtains molten aluminium alloy; Three, casting: the inwall that will have the mold 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 fine aluminium ingot fusing on mold base shop fixtures, is that 710 ℃～725 ℃, hydraulic pressure are that 0.08～0.15MPa, speed are that to be cast as thickness be that 340mm, width are that 1200mm, length are the alloy cast ingot of 4000mm～5000mm with adding the molten aluminium alloy that forms behind the aluminium Ti, B grain graining agent under the condition of 50mm/min in temperature then; 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: the 7N01 alloy cast ingot that will pass through the step 4 processing mills face to 300mm, is 360～420 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, is 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 (5)
1. the method for manufacture of aluminum alloy sheet for high-speed train structure is characterized in that the method for manufacture of aluminum alloy sheet for high-speed train structure is following: one, according to element mass percent 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 requirement of the mass percent of mass percent＞Si of Fe takes by weighing the one-level waste material of fine aluminium ingot, pure magnesium ingot, pure zinc ingot, aluminium manganese master alloy, aluminium chromium hardener, 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; Two, melting: adopt electric furnace to haul oneself willingly into solid material mode one-level waste material, fine aluminium ingot, pure zinc ingot, aluminium manganese master alloy, aluminium chromium hardener, aluminium vanadium master alloy and the aluminium titanium master alloy of aluminum alloy sheet for high-speed train structure joined 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 smelting furnace then, the mass content of mass content＞Si of Fe; And when the mass content of Cu in the aluminium alloy melt＞0.15%, water down, then aluminium alloy melt being used the volume ratio of argon gas and chlorine is 31～33.5: 1 Ar-Cl
2Hydrogen richness≤0.2ml in mixed gas refining to per 100 gram melts leaves standstill 30min, obtains molten aluminium alloy; Three, casting: the inwall that will have the mold 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 fine aluminium ingot fusing on mold base shop fixtures, is that 710 ℃～725 ℃, hydraulic pressure are that 0.08～0.15MPa, speed are that to be cast as thickness be that 340mm, width are that 1200mm, length are the alloy cast ingot of 4000mm～5000mm with adding the molten aluminium alloy that forms behind the aluminium Ti, B grain graining agent under the condition of 45～50mm/min in temperature then; 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: the alloy cast ingot that will pass through the step 4 processing mills face to 290mm～300mm, is 360～420 ℃ at start rolling temperature then, and finishing temperature is under the condition more than 250 ℃, is 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.
2. according to the method for manufacture of the said aluminum alloy sheet for high-speed train structure of claim 1, it is characterized in that the aluminium Ti, B grain graining agent described in the step 1 is the Al-5Ti-1B alloy.
3. according to the method for manufacture of claim 1 or 2 said 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.
4. according to the method for manufacture of the said aluminum alloy sheet for high-speed train structure of claim 3, it is characterized in that insulating covering agent add-on in the step 2 be in the smelting furnace metal quality 0.55%.
5. according to the method for manufacture of claim 1,2 or 4 said 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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