CN102776390B - Method for producing titanium slabs efficiently - Google Patents
Method for producing titanium slabs efficiently Download PDFInfo
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- CN102776390B CN102776390B CN2012102226910A CN201210222691A CN102776390B CN 102776390 B CN102776390 B CN 102776390B CN 2012102226910 A CN2012102226910 A CN 2012102226910A CN 201210222691 A CN201210222691 A CN 201210222691A CN 102776390 B CN102776390 B CN 102776390B
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Abstract
The invention discloses a method for producing titanium slabs efficiently. Electron beam cold hearth furnaces of six electron guns are used, raw materials of which components are selected are placed in bulk material feeders or bar material feeders of the electron beam cold hearth furnaces, smelting is conducted, then obtained cast ingots are cooled and are discharged out of the furnace, and finished products are obtained. According to the method, the raw materials in an original state are used directly for smelting, crushing of recycled materials, mixing of titanium sponge materials, electrode block pressing and electrode welding are avoided, slab ingots smelted through optimization design are two cast ingots of 200*1290*5000mm which are produced in one furnace, the weight is about 12 tons, and the slab ingots are not required to be smelted twice or to be forged can be used in rolling, so that the production flow and the production period are shortened, the production cost is reduced, and the efficiency is improved greatly.
Description
Technical field
The present invention relates to a kind of materials processing technology, particularly a kind of method of High-efficient Production titanium slab.
Background technology
Prior art is mainly the method that VAR melting billet+cogging is forged.(VAR) carries out melting by vacuum consumable electrode arc furnace, this kind method need to be broken into reclaimed materials the bits shape and mix with titanium sponge, be pressed into again electrode block, weld in vacuum welding equipment, then carry out vacuum arc fumace (VAR) melting once, secondary smelting or even three meltings, the ingot casting after melting is billet, forge after machining, need to pass through again the inferior forging of several fire, its forging be become the slab of rectangular parallelepiped, could be used for board materials production.And the planeness of forging slab is poor, the surface oxidation bed thickness, and yield rate is low.Therefore not only the raw material shape is restricted for traditional method, and processing charges is high, complex procedures, and long flow path, and through after melting-forging, the utilization ratio of material is low.
Titanium belongs to infusibility, difficult deformable metal, because the activity of titanium, at high temperature as easy as rolling off a log and the gas reactions such as oxygen, nitrogen are polluted metallic titanium and lost original good process performance and mechanical property.Forge under atmospheric condition and add trade union and form thick zone of oxidation, and it is wayward to forge the dimensional precision of slab, the amount of machining that carries out before rolling is very large, does not satisfy the requirement of near-net-shape.Manufacturing process's complexity and the lumber recovery of titanium slab are low.The manufacturing cost height of titanium sponge is one of high reason of titanium processing material price, and expensive processing charges and the low titanium especially of material use efficiency processed the high major cause of material price in the course of processing.So, a kind of method of inventing High-efficient Production titanium slab, the raw material of employing virgin state, the processing charges of reduction pilot process, the slab of acquisition near-net-shape, the utilization ratio that improves material is the important channel of raising the efficiency, reducing costs.。
Summary of the invention
The technical problem of the solution that the present invention solves is to have introduced a kind of method of High-efficient Production titanium slab, directly uses the raw material of virgin state to carry out melting, has avoided reclaimed materials broken, titanium sponge batch mixing, electrode block compacting, being welded of electrode; Adopt the processing method of " EB melting+High-efficient Production ", can obtain chemical composition even, foreign matter content is low, and surface quality is good, and slab planeness and linearity all are better than forging slab, and amount of machining is little, the slab that yield rate is high.
For the purpose that realizes solving the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of method of High-efficient Production titanium slab, comprise using and have the electron-beam cold bed furnace of 6 electron beam gun, wherein 1#, 2# electron beam gun work area is the melting cold bed, 3#, 4# electron beam gun work area is the refining cold bed, 5#, 6# electron beam gun work area is overflow cold bed and 1#, 2# crystallizer, the corresponding 1# crystallizer of 5# rifle wherein, the corresponding 2# crystallizer of 6# rifle, 1#, 2#, 3# rifle are by the GIP time variable control of 1# computer, 4#, 5#, 6# rifle are by the GIP time variable control of 2# computer, and the GIP program of two computers is set respectively the electron beam gun step, it is characterized in that:
(1), with raw material titanium sponge, electrode block, block reclaimed materials or bits shape reclaimed materials, directly pack in the rotary drum feeder of electron-beam cold bed furnace by feeding system or put into the bar feeder of electron-beam cold bed furnace in the titanium of packing into bar box processed; Wherein reclaimed materials needs the sandblast pickling, then could use;
(2), with working chamber, the feed compartment of electron-beam cold bed furnace with draw the ingot chamber to be evacuated to (1～8) * 10
-2Pa; (3), then open and draw ingot chamber plate valve, will draw the ingot heelpiece to rise up in water jacketed copper crucible;
(4), subsequently feed in raw material at every turn all need re-start venting, material loading is evacuated to (1～8) * 10
-2Pa;
(5), open 1#, 2#, 3#, 4#, 5#, 6# electron beam gun, select " positioning of beam " step, readability and the angle of each electron beam gun working order and stroboscope are confirmed.
(6), 1#, 2#, 3#, 4#, 5#, 6# electron beam gun GIP are transferred to " preheating " step, the titanium scull in fusing cold bed, refining cold bed or overflow cold bed is carried out slow preheating and make its slow expansion.
(7), treat on scull to form the molten bath passage, begin 1#, 2#, 3#, 4#, 5#, 6# rifle GIP are transferred to " testing current step ", the emission maximum electric current that electron beam gun can reach is tested; By testing current, confirm the working order of electron beam gun under large electric current; This is because electron beam gun after this step is high-power many, confirms the working order of electron beam gun under large electric current by testing current, can avoid because of the electron beam gun slab ingot quality problems that job insecurity causes under large electric current.
(8), 1#, 2#, 3# electron beam gun GIP are transferred to " continue melting " step, utilize large electric current that raw material is melted; This step, melts raw material under lasting feed state by 1#, 2#, 3# rifle, and the setting of this process figure and optimization have directly determined melting rate, can optimize to improve melting efficiency by the electron beam gun scanning pattern.
(9), treat that titanium liquid flow to the crucible place, 4#, 5#, 6# electron beam gun GIP are transferred to " filling crucible " step, heighten the energy of 5#, 6# electron beam gun, first the crucible heelpiece is filled full, 4#, 5#, 6# electron beam gun GIP are transferred to " continuing melting " step, improve the melting speed of 1#, 2#, 3# rifle, and the energy of 5#, 6# rifle is set, make the superheating temperature of crucible titanium liquid at 200 ℃, then begin automatically ingot pulling.
Step passes through to improve the melting speed of 1#, 2#, 3# rifle " to continue melting ", and the energy of 5#, 6# rifle is set, and makes the superheating temperature of crucible titanium liquid at 200 ℃, guarantees the flat bloom surface good quality and reduces inner grain size.Step refers to that titanium liquid flows under the crucible state " to continue melting ", the scanning process step of electron beam gun to crucible.
(10), in continuing fusion process, in the setting program of 5#, 6# rifle, edge graph shape is clearly arranged also in " continuing melting " step, constantly crucible limit section is scanned.Like this, fall into the titanium condensation product that prevents the growth of limit section and form condensation product in crucible and be mingled with, thereby have influence on the internal soundness of slab ingot.
(11) if continue in fusion process, because causing melting, Equipment interrupts, 1#, 2#, 3# electron beam gun GIP are transferred to " preheating " step, 4#, 5#, 6# electron beam gun GIP are transferred to " melting interrupt continuous heating step ", the 56# rifle is to slab ingot top continuous heating; After equipment recovers, then continue melting, and the cutout seam crossing does not affect the quality of final titanium ingot.The enforcement of this step, purpose are to eliminate cutout to the impact of slab ingot quality, have avoided the defect ware that causes because of cutout.
(12), ingot length to be drawn reaches the length that needs, and stops charging, and closes 1#, 2#, 3#, 4# electron beam gun, stays 5#, 6# electron beam gun.
(13), 4#, 5#, 6# electron beam gun GIP being transferred to " clear limit " step uses clear limit scanning pattern that crucible runner and crucible limit section are cleared up.
(14), 4#, 5#, 6# electron beam gun GIP are transferred to " heat-sealing top " step the slab ingot top are sealed the top, make its Slow cooling, prevent cooling and cause inner shrinkage cavity shrinkage porosity fast.The creativeness of this step be to eliminate the slab ingot top because of cause for quality must excision defective, after adopting this step, the slab ingot top can be excised.
(15), heat-sealing top is complete, all electron beam gun quit work, vacuum system keeps operation, slab ingot is drawing ingot indoor cooling more than 10 hours, then blow-on venting goes out ingot.
Specific as follows: the size of plate blank of this patent design is slab one of key efficiently.This patent is designed to two, 200 * 1290 * 5000mm ingot casting of stove two ingots, approximately 12 tons of weight.Compare with the slab of normally used 400-500mm thickness, the slab of 200mm need not to carry out the operation of roughing cogging again, can be directly used in the finish rolling operation.The operation of roughing cogging refers on roughing mill by the 400-500mm split rolling method to 200mm, and carries out the surface-treated operation.
Must electrode pressing when the VAR method is produced ingot casting, can only use the block raw material through processing, and in order to guarantee the strength of joint of electrode, adding reclaimed materials can not surpass 30%, and prepared electrode block also need to be welded into a large electrode and could use in vacuum welding equipment.And the electron beam cold hearth melting feeding manner is unrestricted, can use the raw material of the virgin states such as titanium sponge, electrode block, block reclaimed materials or bits shape reclaimed materials, and can use 100% reclaimed materials, can reduce like this titanium material production cost and tooling cost in early stage.Adopt the VAR stove need to carry out the ingot casting that repeatedly melting could obtain homogeneous chemical composition, and the electron-beam cold bed furnace melting once get final product.Ingot casting after the melting of VAR stove is billet, forges after machining, need to pass through the inferior forging of several fire again, its forging is become the slab of rectangular parallelepiped, could be used for board materials production.Electron-beam cold bed furnace has melted out the slab ingot of size, can be directly used in the production of sheet material.The titanium ingot chemical composition of making through electron-beam cold bed furnace is even, and foreign matter content is low, and surface quality is good.Titanium ingot specification is the slab ingot of 200 * 1290 * 5000mm, after 3 ~ 5mm milling machine strips off the skin, can be directly used in hot rolling slab, improves terrible material rate.Slab planeness and linearity all are better than forging slab.
The electron-beam cold bed furnace of this patent is EBCHR 6/200/3600 type electron-beam cold bed furnace, and EBCHR represents the electron beam cold hearth melting stove, and 6 represent 6 electron beam gun, and 200 represent the speed of evacuation of 200000 liters/second, and 3600 represent 3600KW maximum electron rifle power.
The present invention breaks through i.e. " the VAR melting billet+cogging is forged " processing method of traditional slab manufacture method, the method of a kind of High-efficient Production titanium slab of introducing, use the electron-beam cold bed furnace of 6 electron beam gun, bulk cargo feeder or bar feeder with raw material (titanium sponge, electrode block, block reclaimed materials or the bits shape reclaimed materials etc.) electron-beam cold bed furnace of packing into of selected components, carry out melting, then come out of the stove the ingot casting that obtains is cooling, can obtain finished product.The present invention directly uses the raw material of virgin state to carry out melting, has avoided reclaimed materials broken, titanium sponge batch mixing, electrode block compacting, being welded of electrode.The slab ingot that melts out by optimization design is two, 200 * 1290 * 5000mm ingot casting of stove two ingots, approximately 12 tons of weight, and this slab ingot need not secondary smelting, need not to forge, can be directly used in rollingly, shortened Production Flow Chart and production cycle, reduce manufacturing cost, improved greatly efficient.Adopt the processing method of " EB melting+High-efficient Production ", can obtain chemical composition even, foreign matter content is low, and surface quality is good, and slab planeness and linearity all are better than forging slab, and amount of machining is little, the slab that yield rate is high.
By adopting technique scheme, the present invention has following beneficial effect:
The present invention directly uses the raw material of the virgin states such as titanium sponge, block reclaimed materials and bits shape reclaimed materials to carry out melting, has avoided waste material broken, electrode block compacting, being welded of electrode.The use of titanium sponge: 30 barrels of single ingot melting meltings every day, every barrel of 200 kg, but 6 tons of titanium sponges of melting; 60 barrels of two ingot melting meltings every day, every barrel of 200 kg, but 12 tons of titanium sponges of melting; The use of reclaimed materials: the bar collection box only needs the pure titanium plate that 5 3-5mm is thick to being connected into the box of 450*450*1600mm, and then spot welding get final product, is welded simply, and 1 box can be completed making in 2 hours.Be welded and reclaimed materials directly put into the bar case after completing, each load-bearing 500 ~ 1200kg, but approximately 6.5 tons of 9 bar gross weights of single ingot melting single device every day melting, but approximately 13 tons of 18 bar gross weights of two ingot melting single device every day melting; And the slab ingot that melts out can be directly used in hot rolling slab after stripping off the skin through 3 ~ 5mm milling machine, has improved greatly efficient.
The VAR stove of prior art, reclaimed materials is broken, electrode block is suppressed, being welded of electrode needs the long period, and expends a large amount of manpower and materials, with electrode pressing, can suppress 200 every day, and every 10-20kg can prepare raw material 2-4 ton; 1 electrode weight of every stove melting is 150Kg, and every days 5, stove melting production capacity can only reach 750kg, and the titanium ingot that melts out also needs the forging through too much fire time, takes off and can carry out hot rolling after descaling, and gets the material rate also low.
Adopt the method for this patent High-efficient Production titanium slab, the slab yield rate improves approximately 10% than traditional vacuum consumable smelting+forging process; Efficient also improves several times.
TA1 slab chemical composition satisfies " the GBT3620.1-2007 titanium or titanium alloy trade mark and chemical composition ", and its Composition Control can reach the regulation of following table.The monolateral amount of stripping off the skin≤5mm, planeness≤3mm/5m.
Table 1
Hot-rolled sheet and the cold-reduced sheet produced with this slab all satisfy " GBT3621-2007 titanium or titanium alloy sheet material ", and its performance sees the following form.
Table 2 hot-rolled pure titanium plate stretching test result.
| The sampling direction | Yield strength/MPa | Tensile strength/MPa | Unit elongation |
| Index | 140～310 | ≥240 | ≥30 |
| The cross directional stretch sample | 270 | 345 | 40% |
| Samples stretched in longitudinal direction | 250 | 350 | 39.5% |
Table 3 Cold-rolled Pure titanium plate stretching test result.
| The sampling direction | Surrender | Tension | Unit elongation | Bending property |
| Index | 140～310 | ≥240 | ≥30 | ? |
| The cross directional stretch test | 300 | 365 | 47.5 | Qualified |
| The longitudinal stretching test | 250 | 370 | 50 | Qualified |
Embodiment
Embodiment 1: single ingot melting
Starting material: 1 grade of titanium sponge.
Equipment: EBCHR 6/200/3600 type electron-beam cold bed furnace.
The titanium sponge chemical composition requires as shown in table 4.
Table 4
Actual melting technology:
A. 30 barrels of titanium sponges that meet the composition requirement are ready to, minute No. three material loadings, each material loading is put into electron-beam cold bed furnace rotary drum feeder with 10 barrels.
B. with the working chamber of electron-beam cold bed furnace, vibration charging chamber, rotary drum feeder with draw the ingot chamber to be evacuated to 4x 10-2Pa, then open and draw ingot chamber plate valve, will draw the ingot heelpiece to rise up in water jacketed copper crucible.
C. vibration charging chamber plate valve is opened, driven the vibrating feeder feeding port into fusing cold bed top, then the rotary drum feeder plate valve is opened, make feed system be in ready state.
D. open 1#, 2#, 3#, 4#, 5#, 6# electron beam gun, select " positioning of beam " step, readability and the angle of each electron beam gun working order and stroboscope are confirmed.
E. 1#, 2#, 3# and 4,5,6# electron beam gun GIP being transferred to " preheating " step carries out slow preheating to the titanium scull of fusing in cold bed, refining cold bed or overflow cold bed and makes its slow expansion.
F. " vibrator " of vibrating feeder opened, then the rotary drum feeder motor is opened, begin a little charging errorless to confirm charging, then stop charging.
G. treat to form the molten bath passage on scull, begin 1#, 2#, 3#, 4#, 5#, 6# rifle GIP are transferred to " testing current step ", the emission maximum electric current that electron beam gun can reach is tested.
H. 1#, 2#, 3# electron beam gun GIP are transferred to " continuing melting " step, utilize large electric current that raw material is melted.
I. open the rotary drum feeder motor and begin charging, and according to the start and stop of how much carrying out of inlet amount.Can not pile up too many waste material in order to avoid overflow in the fusing cold bed.
J. treat that titanium liquid flow to the crucible place, 4#, 5#, 6# electron beam gun GIP are transferred to " filling crucible " step, first the crucible heelpiece is filled fullly, 4#, 5#, 6# electron beam gun GIP are transferred to " continuing melting " step, then begin automatically ingot pulling.
K. in continuing fusion process, in " continuing melting " step, 5#, 6# rifle have edge graph shape clearly, constantly crucible limit section are scanned, and fall into the titanium condensation product that prevents the growth of limit section to form condensation product in crucible and be mingled with, thereby have influence on the internal soundness of slab ingot.
If L. continue in fusion process, because causing melting, Equipment interrupts, 1#, 2#, 3# electron beam gun GIP are transferred to " preheating " step, 4#, 5#, 6# electron beam gun GIP are transferred to " melting interrupt continuous heating step ", the 5#6# rifle is to slab ingot top continuous heating.
M. ingot length to be drawn reaches the length that needs, and stops charging, and closes 1#, 2#, 3#, 4# electron beam gun, stays 5#, 6# electron beam gun.
N. 4#, 5#, 6# electron beam gun GIP being transferred to " clear limit " step uses dedicated scan figure that crucible runner and crucible limit section are cleared up.
O. 4#, 5#, 6# electron beam gun GIP are transferred to " heat-sealing top " step the slab ingot top is sealed the top, make its Slow cooling, prevent cooling and cause inner shrinkage cavity shrinkage porosity fast.
The heat-sealing top is complete, and all electron beam gun quit work, and vacuum system keeps operation, and slab ingot is drawing ingot indoor cooling more than 10 hours, and then blow-on venting goes out ingot.Going out the ingot specification is 200*1290*5000mm.
The slab ingot chemical composition analysis that melts out such as following table 5.
Table 5
| The position | Fe | C | N | H | O |
| On | 0.034 | 0.023 | 0.005 | 0.001 | 0.074 |
| In | 0.033 | 0.020 | 0.005 | 0.001 | 0.060 |
| Under | 0.025 | 0.022 | 0.005 | 0.001 | 0.069 |
| Average | 0.031 | 0.022 | 0.005 | 0.001 | 0.068 |
The flat bloom surface quality that melts out is good, and chemical composition is even, mills face 5mm rear surface good, and ultrasonic inspection inside is without excessive defect.
Embodiment 2: two ingot meltings
Starting material: 0 grade of titanium sponge.
Equipment: EBCHR 6/200/3600 type electron-beam cold bed furnace.
The titanium sponge chemical composition requires as table 6.
Table 6
Actual melting technology:
A. 60 barrels of titanium sponges that meet the composition requirement are ready to, minute No. six material loadings, each material loading is put into electron-beam cold bed furnace rotary drum feeder with 10 barrels.
B. with the working chamber of electron-beam cold bed furnace, vibration charging chamber, rotary drum feeder with draw the ingot chamber to be evacuated to 4x 10-2Pa, then open and draw ingot chamber plate valve, will draw the ingot heelpiece to rise up in water jacketed copper crucible.
C. vibration charging chamber plate valve is opened, driven the vibrating feeder feeding port into fusing cold bed top, then the rotary drum feeder plate valve is opened, make feed system be in ready state.
D. open 1#, 2#, 3#, 4#, 5#, 6# electron beam gun, selection " positioning of beam " step (, readability and the angle of each electron beam gun working order and stroboscope are confirmed.
E. 1#, 2#, 3# and 4,5,6# electron beam gun GIP being transferred to " preheating " step carries out slow preheating to the titanium scull of fusing in cold bed, refining cold bed or overflow cold bed and makes its slow expansion.
F. " vibrator " of vibrating feeder opened, then the rotary drum feeder motor is opened, begin a little charging errorless to confirm charging, then stop charging.
G. treat to form the molten bath passage on scull, begin 1#, 2#, 3#, 4#, 5#, 6# rifle GIP are transferred to " testing current step ", the emission maximum electric current that electron beam gun can reach is tested.
H. 1#, 2#, 3# electron beam gun GIP are transferred to " continuing melting " step, utilize large electric current that raw material is melted.
I. open the rotary drum feeder motor and begin charging, and according to the start and stop of how much carrying out of inlet amount.Can not pile up too many waste material in order to avoid overflow in the fusing cold bed.
J. treat that titanium liquid flow to the crucible place, 4#, 5#, 6# electron beam gun GIP are transferred to " filling crucible " step, first the crucible heelpiece is filled fullly, 4#, 5#, 6# electron beam gun GIP are transferred to " continuing melting " step, then begin automatically ingot pulling.
K. in continuing fusion process, in " continuing melting " step, 5#, 6# rifle have edge graph shape clearly, constantly crucible limit section are scanned, and fall into the titanium condensation product that prevents the growth of limit section to form condensation product in crucible and be mingled with, thereby have influence on the internal soundness of slab ingot.
If L. continue in fusion process, because causing melting, Equipment interrupts, 1#, 2#, 3# electron beam gun GIP are transferred to " preheating " step, 4#, 5#, 6# electron beam gun GIP are transferred to " melting interrupt continuous heating step ", the 5#6# rifle is to slab ingot top continuous heating.
M. ingot length to be drawn reaches the length that needs, and stops charging, and closes 1#, 2#, 3#, 4# electron beam gun, stays 5#, 6# electron beam gun.
N. 4#, 5#, 6# electron beam gun GIP being transferred to " clear limit " step uses dedicated scan figure that crucible runner and crucible limit section are cleared up.
O. 4#, 5#, 6# electron beam gun GIP are transferred to " heat-sealing top " step the slab ingot top is sealed the top, make its Slow cooling, prevent cooling and cause inner shrinkage cavity shrinkage porosity fast.
The heat-sealing top is complete, and all electron beam gun quit work, and vacuum system keeps operation, and slab ingot is drawing ingot indoor cooling more than 10 hours, and then blow-on venting goes out ingot.Going out the ingot specification is 200*1290*5000mm.
The slab ingot chemical composition analysis that melts out such as following table 7.
Table 7
| Specimen coding | Fe | C | N | H | O |
| On | 0.0190 | 0.0100 | 0.0050 | 0.0014 | 0.0380 |
| Under | 0.0200 | 0.0140 | 0.0050 | 0.0010 | 0.0420 |
| Average | 0.0180 | 0.0170 | 0.0053 | 0.0013 | 0.0500 |
The flat bloom surface quality that melts out is good, and chemical composition is even, mills face 5mm rear surface good, and ultrasonic inspection inside is without excessive defect.
Embodiment 3: single ingot melting
Starting material: block TA1 reclaimed materials.
Equipment: EBCHR 6/200/3600 type electron-beam cold bed furnace.
The reclaimed materials chemical composition requires as shown in table 8.
Table 8
Actual melting technology:
A. with after TA1 reclaimed materials sandblast pickling, put into electron-beam cold bed furnace bar feeder in the titanium of the 450x450x1600mm that packs into bar box processed.
B. with working chamber, the bar feed compartment of electron-beam cold bed furnace with draw the ingot chamber to be evacuated to 4x 10-2Pa, then open and draw ingot chamber plate valve, will draw the ingot heelpiece to rise up in water jacketed copper crucible.
C. open 1#, 2#, 3#, 4#, 5# electron beam gun, select " positioning of beam " step, readability and the angle of each electron beam gun working order and stroboscope are confirmed.
D. 1#, 2#, 3# and 4#, 5#, 6# electron beam gun GIP being transferred to " preheating " step carries out slow preheating to the titanium scull of fusing in cold bed, refining cold bed or overflow cold bed and makes its slow expansion.
E. treat to form the molten bath passage on scull, begin 1#, 2#, 3#, 4#, 5#, 6# rifle GIP are transferred to " testing current step ", the emission maximum electric current that electron beam gun can reach is tested.
F. 1#, 2#, 3# electron beam gun GIP are transferred to " continuing melting " step, utilize large electric current that raw material is melted;
G. treat that titanium liquid flow to the crucible place, 4#, 5#, 6# electron beam gun GIP are transferred to " filling crucible " step, first the crucible heelpiece is filled fullly, 4#, 5#, 6# electron beam gun GIP are transferred to " continuing melting " step, then begin automatically ingot pulling.
H. in continuing fusion process, in the 5# rifle, edge graph shape is clearly arranged in " continuing melting " step, constantly crucible limit section is scanned, fall into the titanium condensation product that prevents the growth of limit section and form condensation product in crucible and be mingled with, thereby have influence on the internal soundness of slab ingot.
If I. continue in fusion process, because causing melting, Equipment interrupts, 1#, 2#, 3# electron beam gun GIP are transferred to " preheating " step, 4#, 5#, 6# electron beam gun GIP are transferred to " the continuous heating step is interrupted in melting ", the 5# rifle is to slab ingot top continuous heating.
J. ingot length to be drawn reaches the length that needs, and stops charging, and closes 1#, 2#, 3#, 4# electron beam gun, stays the 5# electron beam gun.
K. 4#, 5#, 6# electron beam gun GIP being transferred to " clear limit " step uses dedicated scan figure that crucible runner and crucible limit section are cleared up.
L. 4#, 5#, 6# electron beam gun GIP are transferred to " heat-sealing top " step the slab ingot top is sealed the top, make its Slow cooling, prevent cooling and cause inner shrinkage cavity shrinkage porosity fast.
M. the heat-sealing top is complete, and all electron beam gun quit work, and vacuum system keeps operation, and slab ingot is drawing ingot indoor cooling more than 10 hours, and then blow-on venting goes out ingot, and going out the ingot specification is 200*1290*5600mm.
The slab ingot chemical composition analysis that melts out such as following table 9.
Table 9
| The position | Fe | C | N | H | O |
| On | 0.0140 | 0.0270 | 0.0066 | 0.0010 | 0.1030 |
| In | 0.0160 | 0.0360 | 0.0054 | 0.0010 | 0.1030 |
| Under | 0.0120 | 0.0270 | 0.0067 | 0.0010 | 0.0980 |
| Average | 0.0140 | 0.0300 | 0.0062 | 0.0010 | 0.1013 |
The flat bloom surface quality that melts out is good, and chemical composition is even, mills face 5mm rear surface good, and ultrasonic inspection inside is without excessive defect.
Comparative Examples
Starting material: 1 grade of titanium sponge and TA1 reclaimed materials.
Equipment: VAC-150kg.
Chemical composition is defined as shown in table 10.
Table 10
Actual melting technology:
A. with after TA1 reclaimed materials sandblast pickling, carry out fragmentation.
B. reclaimed materials (8%) and the titanium sponge with fragmentation mixes, and carries out the electrode block compacting take 18kg as unit, is of a size of Φ 180x200mm.
8 electrode blocks that C. will suppress carry out the argon arc welding welding, and the grid for welding head, are welded into 1.6 meters of length, the electrode of weight 144kg.
D. will weld good electrode and pack in the VAR stove, carry out 1 melting.And it is cooling to come out of the stove.
E. the titanium ingot of melting being carried out the secondary electric cartridge is welded.
F. for preventing molten reclaimed materials being mingled with in the titanium ingot of bulk, reach the segregation of composition, the titanium ingot is carried out secondary smelting, and it is cooling to come out of the stove.
G. the titanium ingot of coming out of the stove cooling is carried out the rising head excision, because titanium ingot epidermis shrinkage cavity shrinkage porosity is intensive, epidermis is carried out the machined into peeling.
H. the titanium ingot after peeling is forged, take off after forging and descale.
The ingot casting chemical composition analysis that melts out such as following table 11.
Table 11
Claims (1)
1. the method for a High-efficient Production titanium slab, comprise using and have the electron-beam cold bed furnace of 6 electron beam gun, wherein 1#, 2# electron beam gun work area is the melting cold bed, 3#, 4# electron beam gun work area is the refining cold bed, 5#, 6# electron beam gun work area is overflow cold bed and 1#, 2# crystallizer, the corresponding 1# crystallizer of 5# electron beam gun wherein, the corresponding 2# crystallizer of 6# electron beam gun, 1#, 2#, 3# electron beam gun are controlled by the GIP of 1# computer, 4#, 5#, 6# electron beam gun are controlled by the GIP of 2# computer, the GIP of two computers sets respectively the electron beam gun step, it is characterized in that:
(1), with raw material titanium sponge, electrode block, block reclaimed materials or bits shape reclaimed materials, directly pack in the rotary drum feeder of electron-beam cold bed furnace by feeding system or put into the bar feeder of electron-beam cold bed furnace in the titanium of packing into bar box processed; Wherein reclaimed materials needs the sandblast pickling, then could use;
(2), with working chamber, the feed compartment of electron-beam cold bed furnace with draw the ingot chamber to be evacuated to 1 * 10
-2Pa～8 * 10
-2Pa;
(3), then open and draw ingot chamber plate valve, will draw the ingot heelpiece to rise up in water jacketed copper crucible;
(4), subsequently feed in raw material at every turn all need re-start venting, material loading is evacuated to 1 * 10
-2Pa～8 * 10
-2Pa;
(5), open 1#, 2#, 3#, 4#, 5#, 6# electron beam gun, select " positioning of beam " step, readability and the angle of each electron beam gun working order and stroboscope are confirmed;
(6), 1#, 2#, 3#, 4#, 5#, 6# electron beam gun GIP are transferred to " preheating " step, the titanium scull in melting cold bed, refining cold bed or overflow cold bed is carried out slow preheating make its slow expansion;
(7), treat on the titanium scull to form the molten bath passage, begin 1#, 2#, 3#, 4#, 5#, 6# electron beam gun GIP are transferred to " testing current step ", the emission maximum electric current that electron beam gun can reach is tested; By testing current, confirm the working order of electron beam gun under large electric current;
(8), 1#, 2#, 3# electron beam gun GIP are transferred to " continue melting " step, utilize large electric current that raw material is melted;
(9), treat that titanium liquid flow to the crucible place, 4#, 5#, 6# electron beam gun GIP are transferred to " filling crucible " step, heighten the energy of 5#, 6# electron beam gun, first the crucible heelpiece is filled full, 4#, 5#, 6# electron beam gun GIP are transferred to " continuing melting " step, improve the melting speed of 1#, 2#, 3# electron beam gun, and the energy of 5#, 6# electron beam gun is set, make the superheating temperature of crucible titanium liquid at 200 ℃, then begin automatically ingot pulling;
(10), in continuing fusion process, in the setting program of 5#, 6# electron beam gun, edge graph shape is clearly arranged also in " continuing melting " step, constantly crucible limit section is scanned;
(11) if continue in fusion process, because causing melting, Equipment interrupts, 1#, 2#, 3# electron beam gun GIP are transferred to " preheating " step, 4#, 5#, 6# electron beam gun GIP are transferred to " melting interrupt continuous heating step ", 5# and 6# rifle are to slab ingot top continuous heating; After equipment recovers, then continue melting, and the cutout seam crossing does not affect the quality of final titanium ingot;
(12), ingot length to be drawn reaches the length that needs, and stops charging, and closes 1#, 2#, 3#, 4# electron beam gun, stays 5#, 6# electron beam gun;
(13), 4#, 5#, 6# electron beam gun GIP are transferred to " clear limit " step, use clear limit scanning pattern that crucible runner and crucible limit section are cleared up;
(14), 4#, 5#, 6# electron beam gun GIP are transferred to " heat-sealing top " step, the slab ingot top is sealed the top, make its Slow cooling, prevent cooling and cause inner shrinkage cavity shrinkage porosity fast;
(15), heat-sealing top is complete, all electron beam gun quit work, vacuum system keeps operation, slab ingot is drawing ingot indoor cooling more than 10 hours, then blow-on venting goes out ingot.
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| CN103667734B (en) * | 2013-11-25 | 2015-09-30 | 攀枝花云钛实业有限公司 | The pure titanium of a kind of electron beam cold hearth melting stove melting does the method for the head of ingot |
| CN103866130A (en) * | 2014-03-19 | 2014-06-18 | 洛阳双瑞精铸钛业有限公司 | Method for melting titanium scraps and pure titanium wastes of thin titanium plates by electron beam cold hearth melting furnace |
| CN104032151B (en) * | 2014-05-30 | 2016-06-01 | 云南钛业股份有限公司 | EB (electron beam) cold hearth furnace smelting method of TC4 titanium alloy ingot |
| CN107164642B (en) * | 2017-05-12 | 2019-03-08 | 西部钛业有限责任公司 | A method of TA1 titanium ingot is prepared using titanium crumble |
| CN108277370B (en) * | 2017-12-14 | 2019-10-25 | 洛阳双瑞精铸钛业有限公司 | A kind of TC4 titanium alloy large size slab and the preparation method and application thereof |
| CN108265182B (en) * | 2018-01-19 | 2020-04-17 | 青海聚能钛业股份有限公司 | Method for recycling smelting zirconium residues by using electron beam cold bed furnace |
| CN109136596A (en) * | 2018-09-07 | 2019-01-04 | 青海聚能钛金属材料技术研究有限公司 | The processing method of electron-beam cold bed furnace melting TC4 alloy cast ingot |
| CN110918906A (en) * | 2019-10-23 | 2020-03-27 | 云南钛业股份有限公司 | A method for removing bubbles from electron beam cooling bed furnace casting titanium and titanium alloy hollow ingots |
| CN110964916A (en) * | 2020-01-10 | 2020-04-07 | 云南昆钢重型装备制造集团有限公司 | A two-machine two-flow electron beam cooling bed melting furnace |
| CN112708774B (en) * | 2020-12-17 | 2022-11-22 | 云南昆钢电子信息科技有限公司 | Large-scale electron beam cold bed furnace double ingot pulling device and control method |
| CN114289539A (en) * | 2021-11-18 | 2022-04-08 | 成都先进金属材料产业技术研究院股份有限公司 | Production method of titanium alloy seamless pipe |
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| WO2002052051A2 (en) * | 2000-12-27 | 2002-07-04 | Rmi Titanium Company | Methods of melting titanium and other metals and alloys by plasma arc or electron beam |
| US20030226624A1 (en) * | 2002-06-07 | 2003-12-11 | Yoshihiro Hatta | Process for production of titanium alloy |
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| WO2002052051A2 (en) * | 2000-12-27 | 2002-07-04 | Rmi Titanium Company | Methods of melting titanium and other metals and alloys by plasma arc or electron beam |
| US20030226624A1 (en) * | 2002-06-07 | 2003-12-11 | Yoshihiro Hatta | Process for production of titanium alloy |
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