CN1261242C - Mfg. method of magnesium alloyed plate for hot rolling and hot rolling method of magnesium alloyed plate - Google Patents
Mfg. method of magnesium alloyed plate for hot rolling and hot rolling method of magnesium alloyed plate Download PDFInfo
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- CN1261242C CN1261242C CNB021425841A CN02142584A CN1261242C CN 1261242 C CN1261242 C CN 1261242C CN B021425841 A CNB021425841 A CN B021425841A CN 02142584 A CN02142584 A CN 02142584A CN 1261242 C CN1261242 C CN 1261242C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
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Abstract
A method of hot-rolling magnesium alloy comprises discharging a magnesium alloy molten fluid at a temperature range which is 50 to 150 DEG C higher than the melting point of the magnesium alloy; casting the magnesium alloy molten fluid at a temperature range which is 30 to 130 DEG C higher than the melting point of the magnesium alloy to obtain a plate-like ingot with a plate thickness of 50 to 300 cm; applying a lateral rolling on the plate-like ingot for 1 to 15% extension in the thickness direction; and applying a hot-rolling in the thickness direction of the plate.
Description
Technical field
The present invention relates to the hot rolling manufacture method of magnesium alloy plate and the hot-rolling method of magnesium alloy that Al, Zn etc. add element that contain take the Mg metal as base material.
Background technology
Because magnesium alloy is the lightest in practical alloy, and has good weight strength weight/power ratio rigidity ratio, therefore often be used as the framework of electronic instrument. In the past, the method as for the sheet material of casting the framework of being made by magnesium alloy for example adopted the magnesium alloy hot extrusion molding, again this sheet forming was carried out the method that heat is pricked. But in this method, the pressure that pushes during owing to hot extrusion molding is limited, and therefore the Unit Weight of resulting sheet material is restricted. That is, can not produce long thin plate, and the width of thin plate also is subject to severely restricts, can not supply with the goods of large wide cut.
As other manufacture method, be exactly to make ingot bar by casting, after the ingot bar forge hot, carry out again hot rolling (with reference to JP 35-6602 communique). In this method, the reason of why carrying out forge hot after casting is that diameter is the existence of the big particle of number mm in the cast sturcture because can not avoid fully, and therefore, the operation of before hot rolling cast sturcture being destroyed is absolutely necessary. So this method must possess hot forging equipment, and production cost is very high.
As mentioned above, for the low melting point alloy resemble the magnesium alloy, also there is not up to now a kind of effective manufacture method can produce the good large template of inside quality that can direct heating rolls.
Summary of the invention
In view of above present situation, the object of the present invention is to provide a kind of hot rolling manufacture method of magnesium alloy plate and the hot-rolling method of magnesium alloy, this method needn't be by extrusion modling, but also needn't just can make through forge hot the plate of hot rolling, therefore, needn't use hot forging equipment, just can in the manufacturing capacity scope of hot-rolling mill, in the admissible scope of cost, enlarge length and the width of sheet material.
In order to realize this purpose, the present inventor has carried out repeatedly research, finds can avoid faulty casting by specific casting condition, has found thus the method that obtains the large-scale ingot bar that productivity is good, internal soundness is good. And find, by using this ingot bar, needn't pass through hot forging process afterwards, can directly carry out hot rolling, by cross rolling, even in rolling, also can obtain the good coils of hot rolled that can not crack. According to these discoveries, the present invention possesses following structure.
(1) the hot rolling manufacture method of magnesium alloy plate, the method is that cast magnesium alloy is to obtain thickness as the method for the plate ingot bar of 50～300mm, the feature of the method is, in～tapping temperature scope of 150 ℃ higher 50 ℃ than this magnesium alloy fusing point, the fused mass of this magnesium alloy is come out of the stove, the fused mass of this magnesium alloy of casting in～cast temperature scope of 130 ℃ higher 30 ℃ than this magnesium alloy fusing point.
(2) further limit the manufacture method that magnesium alloy plate is used in the hot rolling of (1) putting down in writing, for the thickness of plate ingot bar, the casting mold thickness of slab be set as the casting mold thickness of slab that satisfies following formula (1),
Casting mold thickness of slab (mm) 〉=1.85 * 10-4t
2+2.98×10
-4t+23.6(1)
T: the thickness of plate ingot bar (mm).
(3) further limit the manufacture method that magnesium alloy plate is used in the hot rolling of (1) or (2) putting down in writing, mold temperature is 50 ℃～250 ℃.
(4) (manufacture method of the hot rolling usefulness magnesium alloy plate that (3) are put down in writing, mold temperature is 180 ℃～220 ℃ in further restriction.
(5) further limit the manufacture method that magnesium alloy plate is used in each hot rolling of putting down in writing of (1)～(4), pouring speed is 200～3000cm3/sec。
(6) further limit the manufacture method that magnesium alloy plate is used in the hot rolling of (1) putting down in writing, the feature of the method is also to possess without forging directly this ingot bar is carried out the operation that heat is pricked.
(7) further limit the manufacture method that magnesium alloy plate is used in the hot rolling of (6) putting down in writing, be in the operation of plate ingot bar of 50～300mm casting of magnesium alloy being caused thickness, for the thickness of plate ingot bar, the casting mold thickness of slab is set as the casting mold thickness of slab that satisfies following formula (1)
Casting mold thickness of slab (mm) 〉=1.85 * 10-4t
2+2.98×10
-4t+23.6(1)
T: dull and stereotyped thickness (mm).
(8) further limit the manufacture method that magnesium alloy plate is used in the hot rolling of (6) putting down in writing, mold temperature is 50 ℃～250 ℃.
(9) further limit the manufacture method that magnesium alloy plate is used in the hot rolling of putting down in writing in (8), mold temperature is 180 ℃～220 ℃.
(10) further limit the manufacture method that magnesium alloy plate is used in the hot rolling of (6) putting down in writing, casting rate is 200～3000cm3/sec。
(11) the further hot-rolling method that limits the magnesium alloy of (6) putting down in writing, plate ingot bar carries out hot rolling without forge hot operation possesses along hot rolling carries out 1～15% cross rolling operation with the width of magnesium alloy plate, and the operation of carrying out hot rolling along the thickness of slab direction afterwards.
(12) the further hot-rolling method that limits the magnesium alloy of (6) putting down in writing, hot-rolled process carries out in the scope of recrystallization temperature～eutectic temperature.
(13) the further hot-rolling method that limits the magnesium alloy of (6) putting down in writing, hot-rolled process carries out in 180 ℃～440 ℃ temperature range.
(14) the further hot-rolling method that limits the magnesium alloy of (6) putting down in writing, hot-rolled process by a plurality of mill traines make hot rolling with the magnesium alloy plate attenuation when reaching desirable thickness, the attenuation rate of each mill train is 25%～50%, heats when total attenuation rate surpasses 60% again.
(15) the further hot-rolling method that limits the magnesium alloy of (6) putting down in writing, hot-rolled process by a plurality of mill traines make hot rolling with the magnesium alloy plate attenuation when reaching desirable thickness, under 300 ℃～440 ℃ preheat temperature, hot rolling is carried out preheating with magnesium alloy plate, after the preheating attenuation rate of each mill train is controlled in 25%～50% the scope and carries out hot rolling, when total attenuation rate surpasses 60%, in 230 ℃～440 ℃ temperature range, heat again.
(16) the further hot-rolling method that limits each magnesium alloy of putting down in writing in (6), hot-rolled process by a plurality of mill traines make hot rolling with the magnesium alloy plate attenuation when reaching desirable thickness, under 300 ℃～440 ℃ preheat temperature, hot rolling is carried out preheating with magnesium alloy plate, after the preheating attenuation rate of each mill train is controlled at and carries out hot rolling in 25%～50% scope, and, when rolling temperature before drops to below 300 ℃, in 230 ℃～440 ℃ scope, heat again.
(17) hot-rolling method of magnesium alloy, the feature of the method is, possess hot rolling is carried out 1～15% cross rolling operation and the operation of carrying out hot rolling along the thickness of slab direction in 180 ℃～440 ℃ temperature range after this operation with magnesium alloy plate along the width of flat board.
(18) further limit the hot-rolling method that (17) are put down in writing, hot-rolled process carries out in the recrystallization temperature of magnesium alloy～eutectic temperature scope in hot rolling.
(19) further limit the hot-rolling method that (17) are put down in writing, hot-rolled process carries out in the scope of attenuation rate 25%～50% that makes hot rolling with magnesium alloy plate attenuation each mill train when reaching desirable thickness by a plurality of mill traines, and, when surpassing 60%, total attenuation rate adds again machine.
(20) further limit the hot-rolling method that (17) are put down in writing, hot-rolled process by a plurality of mill traines make hot rolling with the magnesium alloy plate attenuation when reaching desirable thickness, preheat temperature with 300 ℃～440 ℃ is carried out preheating to hot rolling with magnesium alloy plate, after the preheating attenuation rate of each mill train is controlled in 25%～50% the scope and carries out hot rolling, and, when total attenuation rate surpasses 60%, in 230 ℃～440 ℃ scope, heat again.
(21) further limit the hot-rolling method that (17) are put down in writing, hot-rolled process by a plurality of mill traines make hot rolling with the magnesium alloy plate attenuation when reaching desirable thickness, preheat temperature with 300 ℃～440 ℃ is carried out preheating to hot rolling with magnesium alloy plate, after the preheating attenuation rate of each mill train is controlled at and carries out hot rolling in 25%～50% scope, and, when rolling temperature before drops to below 300 ℃, in 230 ℃～440 ℃ scope, heat again.
Although in the present invention, can change because of alloying component as the magnesium alloy fusing point of object, generally about 650 ℃. Because the setting temperature of this low-melting alloy and the temperature difference of mold temperature are less, therefore, if casting condition is undesirable, then can in casting, cause solidifying segregation or solidify and break, thereby cause gas componant to discharge or the casting mold release materials to fire the casting surface that causes bad. In the present invention, as casting condition, should control tapping temperature, the mold thickness of slab, bad with the casting of avoiding envisioning.
The present invention can obtain the plate ingot bar that thickness of slab is 50～300mm by cast magnesium alloy. Magnesium alloy uses the stretching, extension magnesium alloy (ASTM specification AZ, ZK system etc.) that contains Al, Zr, Zn etc. and add element. If thickness of slab is lower than lower limit, then is difficult to control the setting time relevant with casting mold thickness, thereby is difficult to make the impurity that is mingled with in the fused mass to float and removes. On the other hand, thickness of slab is higher than in limited time, the cost up of hot rolling. So making ingot bar thickness is that 50～300mm is optimal. The ingot bar width can be according to casting mold shape Set arbitrarily. When obtaining such ingot bar, the tapping temperature before the casting will than this magnesium alloy fusing point high 50 ℃～150 ℃. If tapping temperature is lower than lower limit, the temperature of fused mass was near near the freezing point, just casting begins to solidify before finishing when then casting began. If tapping temperature is higher than ceiling temperature, the time that not only is cooled to cast temperature is longer, and, can increase the evaporation of adding ingredient and catch fire etc. dangerous. Just because of these reasons just are set in tapping temperature in the said temperature scope. Although cast temperature is set in higher 30 ℃ than this magnesium alloy fusing point, should not exceed 130 ℃ than this magnesium alloy fusing point. Be lower than lower prescribing a time limit, can cause casting bad. On the other hand, be higher than in limited time, can not get suitable setting rate. Therefore, cast temperature should be set in above-mentioned scope.
The thickness of slab of casting mold is set as the casting mold thickness of slab that satisfies following formula with respect to the thickness of flat board.
Casting mold thickness of slab (mm) 〉=1.85 * 10-4t
2+2.98×10
-4t+23.6(1)
T: the thickness of flat ingot bar (mm)
Thickness according to flat ingot bar is set the reasons are as follows of lower limit by formula (1) regulation casting mold thickness of slab. Find after inventor's process studies intensively that setting time preferably 2～30 minutes, setting time are lower than in limited time lower, the slag that swims in the fused mass can not fully be removed, and surpasses upper prescribing a time limit, and can produce big particle in the flat board. This setting time can be controlled by regulating the casting mold thickness of slab. By experiment, the inventor also finds, can obtain to have the relation shown in Fig. 1 and the formula (1) between the casting mold thickness of slab of good setting time and the ingot bar thickness of slab. If the casting mold thickness of slab is lower than the lower limit of formula (1), then can cause because the crystal grain that cooling velocity causes not is thick, cause the release materials burning and cause casting surface bad by the mold temperature rising. If the casting mold thickness of slab is much higher even thickness ratio should be worth more than lower limit, can not affect above-mentioned effect effect of the present invention yet.
Bad in order to prevent casting surface, the preheating of casting mold is carried out in mold temperature is 50 ℃～250 ℃ scope, preferably carries out in 180 ℃～220 ℃ scope. Be lower than lower prescribing a time limit, be difficult to control the cooling velocity at interface between casting mold and the fused mass, easily cause casting surface bad. And surpass upper prescribing a time limit, then can not obtain suitable cooling velocity.
Casting rate is relevant with casting weight, if but casting rate too slowly then can cause solidifying segregation, the not whole unfavorable condition of liquid level can appear too soon, therefore should be at 200～3000cm3In the scope of/sec. In practical operation, turn to target with the homogeneous of flat board, casting time was controlled in 2 minutes.
Then, carry out hot rolling without forge hot in the present invention. The inventor confirms flat board being heated in the situation of carrying out hot rolling after 180 ℃ the fracture of coiled material to occur, and in addition, is being heated in 450 ℃ of situations of carrying out hot rolling, can produce because of organizing of causing of heating bad. Therefore, consider to add breaking of pining for, should be more than the recrystallization temperature of this magnesium alloy～just carry out hot rolling without forge hot in the scope below the eutectic point, be preferably in the processing that homogenizes of carrying out in 180 ℃～440 ℃ the temperature range more than 3 hours. If be lower than this temperature range, then can reduce productivity ratio, if be higher than this temperature range, then segregation can appear. If after carrying out the homogeneous processing, in order to prevent breaking in the hot rolling, along in the operation of thickness of slab direction before hot rolling, immediately the sheet width direction is carried out 1～15% cross rolling. If rolling rate surpasses the upper limit, then can not estimate by the rolling finally rolling increment that reaches of broadening. If be lower than lower limit, then can not bring into play preventing the effect of breaking.
So-called hot rolling, be exactly specifically make by a plurality of mill traines hot rolling with the magnesium alloy plate attenuation when reaching desirable thickness, preheat temperature with 300 ℃～440 ℃ is carried out preheating to hot rolling with magnesium alloy plate, the attenuation rate of each mill train is controlled in 25%～50% the scope, when total attenuation rate surpasses 60%, in 230 ℃～440 ℃ scope, heat again, perhaps when rolling temperature before is lower than below 300 ℃, in 230 ℃～440 ℃ scope, heat again. After the heating, use remaining mill train (the attenuation rate of each mill train is 25%～50%) again, obtain the coils of hot rolled of desired thickness. If the attenuation rate of each mill train is lower than lower limit 25%, can not carry out continuous rolling by crimping, if be higher than the upper limit 50%, then material has the possibility of breaking. If rolling front temperature is lower than 300 ℃, then there is the danger of material breaks. As the condition of heating again, 230 ℃～440 ℃ of heat treatment temperatures preferably with below the eutectic temperature as the upper limit, and must be recrystallization temperature, desirable scope is 400 ℃～430 ℃. If the treatment temperature of preheat temperature, again heating has surpassed eutectic temperature and has heat-treated, will cause organizing bad, thereby badly damaged crudy.
In practical operation, carry out from middle heating again at different production lines of carrying out in order to make hot-rolled process, should be by following scheme implementation. Because when the temperature of magnesium alloy plate was lower than 300 ℃ or total rolling rate and increases in the hot rolling, the danger of rolling middle material breaks can strengthen, so magnesium alloy plate should be delivered to heating furnace from roll mill. The purpose of heating is the distortion that is at first formed by plastic working by the recrystallization acquisition again, so heating-up temperature must be more than recrystallization temperature. If only take recrystallization as purpose, carry out the most effective in the high as far as possible lower short time of temperature so. For example, at this moment heating-up temperature can be 440 ℃, and another purpose of heating is to regulate material structure again, at this moment (for example can be heated in the short period of time rolling necessary material temperature, more than 300 ℃), material delivered on the rolling production line implement rolling process.
Like this, use the present invention just can directly carry out hot rolling without hot forging process, for example, can produce the magnesium alloy large-sized coiled material above 200 kilograms.
Description of drawings
Fig. 1 represents to obtain the dull and stereotyped thickness of slab of good flat board and the relation between the casting mold thickness of slab.
Fig. 2 represents the casting mold shape, (2A) is front view, (2B) is plane.
Fig. 3 represents to obtain the mold temperature of good flat board and the relation between the cast temperature.
The specific embodiment
[embodiment 1]
Use is equivalent to the embodiment of the magnesium alloy plate (thick 86mm, wide 400mm, long 1500mm) of AZ21.
Try to achieve the thickness of slab of casting mold 1 by formula (1), use thickness of slab as the mild steel plate of 25mm, assemble by Fig. 2, so that the face of 400mm * 1500mm can take off. At the inner surface of this casting mold, smeared the releasing agent take magnesium silicate as main body, after the drying, be heated to about 200 ℃ with burner.
Cast take the face of 86mm * 1500mm as upper surface during casting. By combustion furnace magnesium alloy is melted, carry out refining and carry out degassing processing at 660 ℃. Be heated to 720 ℃ before coming out of the stove, be injected in the casting ladle 2, cast with 690 ℃. Casting speed is 900cm3/ sec, the time of extremely solidifying fully after the casting is 6 minutes.
After solidifying fully (66mm is thick, and 400mm is wide, and 1200mm is long) processed on the ingot bar surface, for hot rolling.
Flat board after the casting is in inert protective gas; be set as 430 ℃ of processing that homogenize of carrying out 3 hours; make width rolling from the width that 400mm becomes 370mm afterwards at once; carry out again 2 mill train hot rollings of every mill train 28%; make thickness of slab (be set as 430 ℃ according to heating again after the change in size of 66mm → 48mm → 35mm; heating is 3.5 hours in inert protective gas); then carry out 5 mill train hot rollings of every mill train 35%, make thickness of slab according to the change in size of 35mm → 22.5mm → 14.5mm → 9.5mm → 6.2mm → 4.0mm at once.
By the dull and stereotyped ingot bar that above operation obtains, do not find the inner big particle that has diameter exceedance mm. In addition, in rolling coiled material, the crack that causes because of big particle not occuring yet, limit section seminess do not occur at the edge of width yet. Therefore can determine, use the method can obtain good rolling effect.
The failed example that [comparative example 1] ingot bar thickness of slab is selected
The ingot bar that 20mm is thick carries out hot rolling by the method identical with embodiment 1, produces the slit at right angle along rolling direction, and occurs breaking as basic point. Its reason is because the ingot bar thickness of slab is inadequate, and the impurity in the fused mass does not fully float and causes latent defect.
The failed example that [comparative example 2] casting mold thickness of slab is selected
Take the ingot bar thickness of slab as 80mm, the casting mold thickness of slab of embodiment 1 is that 10mm tests. The situation of the cooling capacity deficiency of cooling velocity and casting mold occurs, produced big particle, cause the faulty casting surface. Need to carry out to the surface of dull and stereotyped ingot bar the grinding of several 10mm, in addition, in hot rolling, occur breaking.
The failed example of [comparative example 3] hot rolling
Under the condition of embodiment 1, the width that does not carry out ingot bar is rolling but directly carry out hot rolling, the limit section crackle of 30mm occurs at the 3rd mill train.
With the working condition of embodiment 1 and comparative example 1～3 and the outcome record that obtains in table 1.
Table 1 magnesium alloy coiled material create conditions 1 and the result
| Project | Embodiment 1 | Comparative example 1 | Bi More example 2 | Comparative example 3 | |||
| Dull and stereotyped specification (mm) | Thickness | 86 | 20 | 80 | 86 | ||
| Width | 400 | 400 | 400 | 400 | |||
| Length | 1500 | 1500 | 1500 | 1500 | |||
| Mold thickness (mm) | 25 | 25 | 10 | 25 | |||
| The mold preheat temperature (℃) | 200 | 220 | 200 | 180 | |||
| Tapping temperature (℃) | 720 | 730 | 720 | 740 | |||
| Cast temperature (℃) | 690 | 700 | 690 | 705 | |||
| Casting speed (cm3/sec) | 900 | 200 | 900 | 900 | |||
| The heat-treat condition that homogenizes (℃, hr) | 430、3 | 430、3 | 430、3 | 430、3 | |||
| Rolling condition | The rolling rate of width (%) | 7.5 | 7.2 | 7.3 | 0 | ||
| Rolling number of times | 7 | 2 | 4 | 7 | |||
| The rolling rate of each mill train (%) | 28～35 | 25～30 | 25～40 | 28～40 | |||
| Rolling rate (%) before heating again | 48 | - | - | 48 | |||
| Heating condition (℃, hr) again | 430、3 | - | - | 430、3 | |||
| Final thickness of slab (mm) | 4.0 | 9.8 | 16.5 | 4.0 | |||
| The result | Good casting surface | ○ | × | × | ○ | ||
| There is not thick crystal grain | ○ | ○ | × | ○ | |||
| There is not fracture | ○ | × | × | × | |||
| Remarks | Casting surface is good, rolls out the good coiled material that does not have limit section crackle. | Produce the bad situation of casting surface, material breaks when rolling 2 mill train. | Because setting rate is improper, therefore when hot rolling 4 mill train, produces and break. | Although make good flat board, it is rolling not carry out width, therefore produces limit section crackle. | |||
[embodiment 2]
Used the embodiment of the magnesium alloy plate (thick 170mm, wide 600mm, long 1500mm) that is equivalent to AZ21.
Calculate the thickness of slab of casting mold 1 by formula (1), use thickness of slab to be the mild steel plate of 30mm, assemble by the shape of Fig. 2, so that the face of 600mm * 1500mm can take off. In the inside of this casting mold, smeared the releasing agent take magnesium silicate as main body, after the drying, be heated to about 200 ℃ with burner.
Cast take the face of 170mm * 1500mm as upper surface during casting. By combustion furnace magnesium alloy is melted, carry out refining, degassing processing with 660 ℃. Be heated to 720 ℃ before coming out of the stove, be injected in the casting ladle 2, cast with 690 ℃. Casting speed is 1100cm3/ sec, the time of extremely solidifying fully after the casting is 6 minutes.
After solidifying fully (66mm is thick, and 400mm is wide, and 1200mm is long) processed on the ingot bar surface, for hot rolling.
Flat board after the casting is in inert protective gas; be set as 430 ℃ of processing that homogenize of carrying out 4 hours; carry out afterwards the width rolling (8%) from 580mm to 534mm at once; carry out again the hot rolling of each mill train 25～50%; make thickness of slab become 47mm from 150mm, heat again afterwards (be set as 430 ℃, heating is 4 hours in inert protective gas); then carry out the hot rolling of every mill train 25～50%, make thickness of slab become 8.0mm from 47mm at once.
Make dull and stereotyped and rolling coiled material by above operation, in the dull and stereotyped ingot bar that obtains, do not found the inner big particle that has diameter exceedance mm. In addition, in the tissue after rolling, the crack that causes because of big particle not occuring yet, limit section seminess do not occur at the edge of wide cut direction yet. Therefore can confirm, use the method can obtain good rolling effect.
The failed example 1 that [comparative example 4] casting mold preheat temperature and cast temperature are selected
Use casting mold similarly to Example 2, test take mold temperature as 140 ℃, cast temperature as 650 ℃, fused solution begins to solidify in casting process, the bad situation of the casting surfaces such as casting lap occurred. Carry out carrying out again hot rolling after the surfacing for the blemish of the dull and stereotyped ingot bar that obtains. During hot rolling, occurred because the crack, right angle that the latent defect of dull and stereotyped ingot bar causes in rolling direction.
The failed example 2 that [comparative example 5] casting mold preheat temperature and cast temperature are selected
Use casting mold similarly to Example 2, test take mold temperature as 275 ℃, cast temperature as 700 ℃. Because the setting rate after the casting is improper, the faulty casting surfaces such as scab have therefore been caused. Carry out carrying out again hot rolling after the surfacing for the blemish of the dull and stereotyped ingot bar that obtains. During hot rolling, occurred because the crack, right angle that the latent defect of dull and stereotyped ingot bar causes in rolling direction.
The failed example 3 that [comparative example 6] casting mold preheat temperature and cast temperature are selected
Use casting mold similarly to Example 2, test take mold temperature as 275 ℃, cast temperature as 750 ℃. Because the setting rate after the casting is improper, therefore cause crystal grain thick. When the dull and stereotyped ingot bar that obtains is carried out hot rolling, the crack occurs, caused Materials Fracture.
With embodiment 2 and comparative example 4～6 create conditions and the outcome record of gained in table 2.
Table 2 magnesium alloy coiled material create conditions 2 and the result
| Project | Embodiment 2 | Comparative example 4 | Comparative example 5 | Comparative example 6 | |||
| Dull and stereotyped specification (mm) | Thickness | 170 | 170 | 170 | 170 | ||
| Width | 600 | 600 | 600 | 600 | |||
| Length | 1500 | 1500 | 1500 | 1500 | |||
| Mold thickness (mm) | 30 | 30 | 30 | 30 | |||
| The mold preheat temperature (℃) | 200 | 140 | 275 | 275 | |||
| Tapping temperature (℃) | 720 | 720 | 720 | 780 | |||
| Cast temperature (℃) | 690 | 650 | 700 | 750 | |||
| Casting speed (cm3/sec) | 1100 | 1100 | 1100 | 1100 | |||
| The heat-treat condition that homogenizes (℃, hr) | 430、4 | 430、4 | 430、4 | 430、4 | |||
| Rolling condition | The rolling rate of width (%) | 8.1 | 9.2 | 7.3 | 8.3 | ||
| Rolling number of times | 15 | 15 | 15 | 6 | |||
| The rolling rate of each mill train (%) | 25～50 | 25～50 | 25～50 | 25～50 | |||
| Rolling rate (%) before heating again | 58 | 57 | 58 | - | |||
| Heating condition (℃, hr) again | 430、4 | 430、4 | 430、4 | - | |||
| Final thickness of slab (mm) | 3.0 | 3.0 | 3.0 | 5.0 | |||
| The result | Good casting surface | ○ | × | × | × | ||
| There is not thick crystal grain | ○ | ○ | ○ | × | |||
| There is not fracture | ○ | × | × | × | |||
| Remarks | Casting surface is good, and rolling out does not have | Because casting condition is not suitable for, therefore | Because casting condition is not suitable for, therefore | Because casting condition is not suitable for, therefore can pass through | |||
| The good coiled material of limit section crackle. | Generation is because of breaking that the defective of casting the formation such as wrinkle causes. | Generation is because of breaking that the defective of the formation such as scab causes. | Thickization of crystalline particle position causes material breaks when rolling 6 mill train. |
Use the present invention directly to carry out hot rolling without hot forging process, for example, can make the magnesium alloy large-sized coiled material above 200 kilograms.
Claims (16)
1. hot rolling is with the manufacture method of magnesium alloy plate, the method is that cast magnesium alloy is to obtain thickness as the method for the plate ingot bar of 50～300mm, it is characterized in that, in～tapping temperature scope of 150 ℃ higher 50 ℃ than this magnesium alloy fusing point, the fused mass of this magnesium alloy is come out of the stove, the fused mass of this magnesium alloy of casting in than the cast temperature scope of 30 ℃～130 ℃ in this magnesium alloy fusing point section.
2. hot rolling as claimed in claim 1 is further characterized in that with the manufacture method of magnesium alloy plate, for the thickness of plate ingot bar, the casting mold thickness of slab is set as the casting mold thickness of slab that satisfies following formula (1),
Casting mold thickness of slab (mm) 〉=1.85 * 10-4t
2+2.98×10
-4t+23.6 (1)
T: the thickness of plate ingot bar (mm).
3. hot rolling as claimed in claim 1 is further characterized in that with the manufacture method of magnesium alloy plate mold temperature is 50 ℃～250 ℃.
4. hot rolling as claimed in claim 3 is further characterized in that with the manufacture method of magnesium alloy plate mold temperature is 180 ℃～220 ℃.
5. hot rolling as claimed in claim 1 is further characterized in that with the manufacture method of magnesium alloy plate pouring speed is 200～3000cm3/sec。
6. hot rolling as claimed in claim 1 is characterized in that with the manufacture method of magnesium alloy plate, also possesses without forging directly this ingot bar is carried out the operation that heat is pricked.
7. hot rolling as claimed in claim 6 is with the manufacture method of magnesium alloy plate, being further characterized in that, is in the operation of plate ingot bar of 50～300mm, for the thickness of plate ingot bar casting of magnesium alloy being caused thickness, the casting mold thickness of slab is set as the casting mold thickness of slab that satisfies following formula (1)
Casting mold thickness of slab (mm) 〉=1.85 * 10-4t
2+2.98×10
-4t+23.6 (1)
T: dull and stereotyped thickness (mm).
8. hot rolling as claimed in claim 6 is further characterized in that with the manufacture method of magnesium alloy plate mold temperature is 50 ℃～250 ℃.
9. hot rolling as claimed in claim 8 is further characterized in that with the manufacture method of magnesium alloy plate mold temperature is 180 ℃～220 ℃.
10. hot rolling as claimed in claim 6 is further characterized in that with the manufacture method of magnesium alloy plate casting rate is 200～3000cm3/sec。
11. the hot-rolling method of magnesium alloy as claimed in claim 6, be further characterized in that, plate ingot bar carries out hot rolling without forge hot operation possesses the operation of carrying out 1～15% cross rolling along hot rolling with the width of magnesium alloy plate, and the operation of carrying out hot rolling along the thickness of slab direction afterwards.
12. the hot-rolling method of magnesium alloy as claimed in claim 6 is further characterized in that, hot-rolled process carries out in the scope of recrystallization temperature～eutectic temperature.
13. the hot-rolling method of magnesium alloy as claimed in claim 6 is further characterized in that, hot-rolled process carries out in 180 ℃～440 ℃ temperature range.
14. the hot-rolling method of magnesium alloy as claimed in claim 6, be further characterized in that, hot-rolled process by a plurality of mill traines make hot rolling with the magnesium alloy plate attenuation when reaching desirable thickness, the attenuation rate of each mill train is 25%～50%, heats when total attenuation rate surpasses 60% again.
15. the hot-rolling method of magnesium alloy as claimed in claim 6, be further characterized in that, hot-rolled process by a plurality of mill traines make hot rolling with the magnesium alloy plate attenuation when reaching desirable thickness, under 300 ℃～440 ℃ preheat temperature, hot rolling is carried out preheating with magnesium alloy plate, after the preheating attenuation rate of each mill train is controlled in 25%～50% the scope and carries out hot rolling, when total attenuation rate surpasses 60%, in 230 ℃～440 ℃ temperature range, heat again.
16. the hot-rolling method of magnesium alloy as claimed in claim 6, be further characterized in that, hot-rolled process by a plurality of mill traines make hot rolling with the magnesium alloy plate attenuation when reaching desirable thickness, under 300 ℃～440 ℃ preheat temperature, hot rolling is carried out preheating with magnesium alloy plate, after the preheating attenuation rate of each mill train is controlled in 25%～50% the scope and carries out hot rolling, and, when rolling temperature before drops to below 300 ℃, in 230 ℃～440 ℃ scope, heat again.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001322109A JP3657217B2 (en) | 2001-10-19 | 2001-10-19 | Method for producing magnesium alloy slab for hot rolling and method for hot rolling magnesium alloy |
| JP2001322109 | 2001-10-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1415438A CN1415438A (en) | 2003-05-07 |
| CN1261242C true CN1261242C (en) | 2006-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021425841A Expired - Lifetime CN1261242C (en) | 2001-10-19 | 2002-08-19 | Mfg. method of magnesium alloyed plate for hot rolling and hot rolling method of magnesium alloyed plate |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP3657217B2 (en) |
| KR (1) | KR100582802B1 (en) |
| CN (1) | CN1261242C (en) |
| HK (1) | HK1055408A1 (en) |
| TW (1) | TW533100B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100671196B1 (en) * | 2005-04-02 | 2007-01-25 | 주식회사 지알로이테크놀로지 | Manufacturing method of particle-distributed wrought magnesium alloys and wrought magnesium alloys thereby |
| JP4296158B2 (en) * | 2005-03-15 | 2009-07-15 | 株式会社日本製鋼所 | Method for producing Mg alloy |
| JP5467294B2 (en) * | 2008-06-05 | 2014-04-09 | 独立行政法人産業技術総合研究所 | Easy-formable magnesium alloy sheet and method for producing the same |
| CN102416405B (en) * | 2011-09-29 | 2013-08-14 | 西部钛业有限责任公司 | Method for processing magnesium alloy wide-width medium-thick plate |
| CN103272852B (en) * | 2013-04-30 | 2015-08-05 | 中色科技股份有限公司 | A kind of technique of rolling wide magnesium alloy strip |
| KR101481909B1 (en) | 2013-08-08 | 2015-01-13 | 주식회사 포스코 | Manufacturing method of magnesium alloy |
| CN103658173B (en) * | 2013-12-13 | 2016-01-06 | 内蒙古科技大学 | A kind of method based on billet production different performance magnesium alloy plate |
| US10370745B2 (en) * | 2014-08-01 | 2019-08-06 | The Boeing Company | Magnesium-zinc-manganese-tin-yttrium alloy and method for making the same |
| CN105463354A (en) * | 2016-01-22 | 2016-04-06 | 重庆大学 | Method for improving strength of magnesium alloy plate through pre-stretching and low-temperature annealing technology |
| CN108787780A (en) * | 2017-04-26 | 2018-11-13 | 中国宝武钢铁集团有限公司 | The production line of even volume production magnesium alloy board volume squeezes in a kind of company |
| CN109465310A (en) * | 2018-12-26 | 2019-03-15 | 西南铝业（集团）有限责任公司 | A kind of high-magnesium aluminum alloy ultra-thick plate and its control technique |
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| JP2648731B2 (en) * | 1992-03-23 | 1997-09-03 | 新日本製鐵株式会社 | Hot rolling method of Cu-added high Mg aluminum alloy |
| JPH10216806A (en) * | 1997-02-04 | 1998-08-18 | Nippon Steel Corp | Method for hot-rolling al-mg base alloy |
| JP3398050B2 (en) * | 1998-05-27 | 2003-04-21 | 大平洋金属株式会社 | Method for producing hot rolled sheet of high Ni alloy |
| JP4278256B2 (en) * | 2000-01-06 | 2009-06-10 | 日本金属株式会社 | Warm plastic working method |
-
2001
- 2001-10-19 JP JP2001322109A patent/JP3657217B2/en not_active Expired - Lifetime
-
2002
- 2002-08-09 TW TW091117932A patent/TW533100B/en not_active IP Right Cessation
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- 2002-08-19 CN CNB021425841A patent/CN1261242C/en not_active Expired - Lifetime
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Also Published As
| Publication number | Publication date |
|---|---|
| HK1055408A1 (en) | 2004-01-09 |
| JP2003126943A (en) | 2003-05-08 |
| KR20030032830A (en) | 2003-04-26 |
| KR100582802B1 (en) | 2006-05-23 |
| JP3657217B2 (en) | 2005-06-08 |
| CN1415438A (en) | 2003-05-07 |
| TW533100B (en) | 2003-05-21 |
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