CN109014090B - Hot-top casting process of 7-series aluminum alloy round bar - Google Patents
Hot-top casting process of 7-series aluminum alloy round bar Download PDFInfo
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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Abstract
The invention provides a hot top casting process of a 7-series aluminum alloy round bar, which comprises the following steps: s1, blending; s2, melting; s3, refining; s4, casting; step S4' is preceded by step S4: cleaning a crystallizer, polishing the surfaces of a graphite ring and an adapter plate, mixing purified water and talcum powder and repeatedly kneading to form talcum powder paste, adding purified water again to repeatedly knead until the talcum powder paste is fine and uniform, standing, then coating the talcum powder paste at the joint of the graphite ring and the adapter plate, pressing the talcum powder paste during coating, brushing a layer of edible vegetable oil on the surface of the talcum powder paste after finishing coating, and then performing the step S4 within 40 minutes; in step S4, the composition and casting process of the 7-series aluminum alloy are well controlled. After the technical scheme is adopted, the 7 aluminum alloy round bar cast by the hot top has small segregation layer, high surface quality and less metallurgical defects.
Description
Technical Field
The invention relates to the technical field of aluminum alloy casting, in particular to a hot-top casting process of a 7-series aluminum alloy round bar.
Background
With the rapid development of the aluminum alloy processing industry in China, the requirements of downstream aluminum processing manufacturers on the surface quality and the metallurgical structure of the aluminum alloy round bar are stricter and stricter.
In the prior art, before hot top casting of a 7-series aluminum alloy round bar, 800-mesh talcum powder is usually matched with mineral lubricating oil in a ratio of 1:1, and is kneaded into a mass to form talcum powder paste, and the talcum powder paste is coated between a hot top graphite ring and an adapter plate and plays a role in lubricating in the hot top casting process to improve the surface quality of the hot top cast aluminum alloy round bar. However, in the hot top casting process, the talc powder paste is not firmly bonded with the graphite ring, and in the high temperature casting process (710 ℃ -730 ℃), the talc powder paste easily falls off, so that the adapter plate hangs aluminum, the cast ingot is pulled to crack, the surface quality, the casting length, the yield and the production safety are seriously affected, and the aluminum alloy round bar produced in the prior art has more metallurgical defects (including corrosion spots, shrinkage cavities, cold shut, ring lines, metal nodules, cracks, slag inclusion and the like), and is difficult to meet the higher and higher requirements of manufacturers on the surface quality and the metallurgical structure of the aluminum alloy round bar, so that the aluminum alloy extrusion manufacturers generally need to peel or machine the aluminum alloy round bar before production, and the processing period is long, and the processing cost is high. Therefore, it is required to develop a hot-top casting process with a small segregation phase, high surface quality and few metallurgical defects in a 7-series aluminum alloy round bar.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide a hot-top casting process with high surface quality and less metallurgical defects for 7-series aluminum alloy round rods.
The invention discloses a hot top casting process of an aluminum alloy round bar, which comprises the following steps:
s1: preparing materials;
s2: melting;
s3: refining;
s4: casting;
the step S4 is also preceded by a step S4': cleaning the crystallizer, and polishing the surfaces of the graphite ring and the adapter plate after cleaning; mixing purified water and talcum powder and repeatedly kneading to form talcum powder paste, adding purified water again and repeatedly kneading until the talcum powder paste is fine and uniform, and then standing; smearing the talc powder paste at the joint of the graphite ring and the adapter plate, pressing the talc powder paste during smearing, and ensuring that no cavity exists in the talc powder paste after smearing is finished; after the talcum powder paste is coated, brushing a layer of edible vegetable oil on the surface of the talcum powder paste; thereafter, step S4 was performed within 40 minutes;
in the step S4, the casting speed is 100-140 mm/min; the casting temperature is 690 and 710 ℃; the water temperature of the cooling water inlet is less than 30 ℃, the flow rate of the cooling water is 2500-2。
Preferably, in step S1, the ingredients are mixed according to the following mass percentages: si: less than or equal to 0.15 percent; fe: less than or equal to 0.2 percent; cu: 0.03-0.12%; mn: 0.12 to 0.18 percent; mg: 0.75-0.9%; cr: less than or equal to 0.15 percent; zn: 5.45 to 5.65 percent; ti: less than or equal to 0.1 percent; impurities: the single component is less than or equal to 0.05 percent, and the total amount is less than or equal to 0.15 percent; the balance being Al.
Preferably, in step S4', steel wool with the mark 0000 is used to polish the surfaces of the graphite ring and the adapter plate in a clockwise or counterclockwise direction, and no obvious scratch is left on the surface of the graphite ring after polishing;
preferably, in step S4', the purified water and the talc powder are mixed in a mass ratio of 4: 3.
Preferably, all the talcum powder is mixed with 1/2 pure water, the water temperature of the pure water is controlled at 25-35 ℃, and the talcum powder paste is formed by repeatedly kneading for 5-6 min; adding the rest 1/2 purified water, kneading repeatedly for 5-6min until the pulvis Talci paste is fine and uniform, and standing for 5-10 min.
Preferably, in the step S4', the talc powder is 3000 mesh.
Preferably, in the step S4', the talc powder paste is applied to the joint of the graphite ring and the adapter plate in a clockwise or counterclockwise direction.
Preferably, the width of the talc powder paste is 2 to 3cm when the application is completed.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1. the aluminum alloy round bar is not easy to crack in the casting process, the surface quality of the aluminum alloy round bar is good, and the forming rate is high.
2. The cast aluminum alloy round bar has small segregation layer and few surface metallurgical defects.
Detailed Description
For a further understanding of the present invention, reference will now be made in detail to the following examples.
Example 1: a hot top casting process of a 7-series aluminum alloy round rod comprises the following steps:
s1, preparing materials: the materials are prepared according to the following mass percentage:
and S2, melting.
And S3, refining.
And S4, casting. Wherein the casting speed is 110 mm/min; the casting temperature is 695 ℃; the cooling strength is: cooling water inlet water temperature is 26 ℃, cooling water flow is 2600L/min, cooling water pressure: 3kg/cm2(ii) a The liquid level of the die disc is closely monitored according to actual production requirements.
The following step S4' is performed before the step S4 is performed:
cleaning the crystallizer, polishing the surfaces of the graphite ring and the adapter plate by high-quality steel wool with the mark number of 0000 along the clockwise or anticlockwise direction, strictly prohibiting clockwise and anticlockwise cross polishing, polishing along one direction, and enabling the surface of the graphite ring to have no visible scratches after polishing.
Proportioning purified water and 3000 meshes of talcum powder according to a mass ratio of 4:3, mixing all the talcum powder with 1/2 purified water, controlling the water temperature of the purified water at 25 ℃, repeatedly kneading for 6min, then adding the rest 1/2 purified water, repeatedly kneading until the talcum powder paste is fine and uniform and is not sticky, and then standing for 5 min.
The talc powder paste with the size of mung bean is cut by the forefinger, and is smeared at the joint of the graphite ring and the adapter plate along the clockwise direction or the anticlockwise direction, and the talc powder paste is pressed with a certain force during smearing, so that no cavity is formed in the talc powder paste after smearing is finished, and the width of the talc powder paste is 2cm when smearing is finished.
After the steps are completed, immediately brushing a layer of edible vegetable oil on the surface of the talcum powder paste, brushing the surface of the talcum powder paste completely at one time during oil brushing, so that the edible vegetable oil can permeate into the surface of the talcum powder paste to enable the surface of the talcum powder paste to be smoother and finer, and the wettability of the talcum powder paste can be kept, and then performing step S4 within 40 minutes.
Through actual detection, the technical indexes of the aluminum alloy round bar cast by the steps are as follows:
| deviation of diameter | Degree of curvature | Shrinkage cavity | Segregation phase | Cold partition | Ring grain | Slag inclusion | Stain of corrosion | Strain injury | Pulling crack | Length of casting |
| ±0.35mm | 0.4mm | ≤0.2mm | 400-430um | Is free of | Is free of | Is free of | Is free of | ≤0.2mm | Is free of | 8500mm |
The aluminum alloy round bar has small segregation layer, high surface quality and few metallurgical defects.
Example 2: a hot top casting process of a 7-series aluminum alloy round rod comprises the following steps:
s1, preparing materials: the materials are prepared according to the following mass percentage:
and S2, melting.
And S3, refining.
And S4, casting. Wherein the casting speed is 100 mm/min; the casting temperature is 700 ℃; the cooling strength is: cooling water inlet water temperature of 28 ℃, cooling water flow rate of 2800L/min, cooling water pressure: 3.5kg/cm2(ii) a The liquid level of the die disc is closely monitored according to actual production requirements.
The following step S4' is performed before the step S4 is performed:
cleaning the crystallizer, polishing the surfaces of the graphite ring and the adapter plate by high-quality steel wool with the mark number of 0000 along the clockwise or anticlockwise direction, strictly prohibiting clockwise and anticlockwise cross polishing, polishing along one direction, and enabling the surface of the graphite ring to have no visible scratches after polishing.
Proportioning purified water and 3000 meshes of talcum powder according to a mass ratio of 4:3, mixing all the talcum powder with 1/2 purified water, controlling the water temperature of the purified water at 35 ℃, repeatedly kneading for 6min, then adding the rest 1/2 purified water, repeatedly kneading until the talcum powder paste is fine and uniform and is not sticky, and then standing for 10 min.
The talc powder paste with the size of mung bean is cut by the forefinger and is smeared at the joint of the graphite ring and the adapter plate in the clockwise or anticlockwise direction, and the talc powder paste is pressed with a certain force during smearing, so that no cavity is formed in the talc powder paste after smearing is finished, and the width of the talc powder paste is 2.5cm when smearing is finished.
After the steps are completed, immediately brushing a layer of edible vegetable oil on the surface of the talcum powder paste, brushing the surface of the talcum powder paste completely at one time during oil brushing, so that the edible vegetable oil can permeate into the surface of the talcum powder paste to enable the surface of the talcum powder paste to be smoother and finer, and the wettability of the talcum powder paste can be kept, and then performing step S4 within 40 minutes.
Through actual detection, the technical indexes of the aluminum alloy round bar cast by the steps are as follows:
| deviation of diameter | Degree of curvature | Shrinkage cavity | Segregation phase | Cold partition | Ring grain | Slag inclusion | Stain of corrosion | Strain injury | Pulling crack | Length of casting |
| ±0.35mm | 0.1mm | Is free of | 430-500um | Is free of | Is free of | Is free of | Is free of | ≤0.3mm | Is free of | 8300mm |
The aluminum alloy round bar has small segregation layer, high surface quality and few metallurgical defects.
Example 3: a hot top casting process of a 7-series aluminum alloy round rod comprises the following steps:
s1, preparing materials: the materials are prepared according to the following mass percentage:
and S2, melting.
And S3, refining.
And S4, casting. Wherein the casting speed is 120 mm/min; the casting temperature is 705 ℃; the cooling strength is: the water temperature of a cooling water inlet is 27 ℃, the flow of the cooling water is 3400L/min, and the water pressure of the cooling water is as follows: 6kg/cm2(ii) a The liquid level of the die disc is closely monitored according to actual production requirements.
The following step S4' is performed before the step S4 is performed:
cleaning the crystallizer, polishing the surfaces of the graphite ring and the adapter plate by high-quality steel wool with the mark number of 0000 along the clockwise or anticlockwise direction, strictly prohibiting clockwise and anticlockwise cross polishing, polishing along one direction, and enabling the surface of the graphite ring to have no visible scratches after polishing.
Proportioning purified water and 3000 meshes of talcum powder according to a mass ratio of 4:3, mixing all the talcum powder with 1/2 purified water, controlling the water temperature of the purified water at 30 ℃, repeatedly kneading for 6min, then adding the rest 1/2 purified water, repeatedly kneading until the talcum powder paste is fine and uniform and is not sticky, and then standing for 8 min.
The talc powder paste with the size of mung bean is cut by the forefinger, and is smeared at the joint of the graphite ring and the adapter plate along the clockwise direction or the anticlockwise direction, and the talc powder paste is pressed with a certain force during smearing, so that no cavity is formed in the talc powder paste after smearing is finished, and the width of the talc powder paste is 3cm when smearing is finished.
After the steps are completed, immediately brushing a layer of edible vegetable oil on the surface of the talcum powder paste, brushing the surface of the talcum powder paste completely at one time during oil brushing, so that the edible vegetable oil can permeate into the surface of the talcum powder paste to enable the surface of the talcum powder paste to be smoother and finer, and the wettability of the talcum powder paste can be kept, and then performing step S4 within 40 minutes.
Through actual detection, the technical indexes of the aluminum alloy round bar cast by the steps are as follows:
| deviation of diameter | Degree of curvature | Shrinkage cavity | Segregation phase | Cold partition | Ring grain | Slag inclusion | Stain of corrosion | Strain injury | Pulling crack | Length of casting |
| ±0.3mm | 0.2mm | Is free of | 440-510um | Is free of | Is free of | Is free of | Is free of | ≤0.2mm | Is free of | 8400mm |
The aluminum alloy round bar has small segregation layer, high surface quality and few metallurgical defects.
Example 4: a hot top casting process of a 7-series aluminum alloy round rod comprises the following steps:
s1, preparing materials: the materials are prepared according to the following mass percentage:
and S2, melting.
And S3, refining.
And S4, casting. Wherein the casting speed is 115 mm/min; the casting temperature is 708 ℃; the cooling strength is: cooling water inlet water temperature is 24 ℃, cooling water flow is 3100L/min, cooling water pressure is: 5kg/cm2(ii) a The liquid level of the die disc is closely monitored according to actual production requirements.
The following step S4' is performed before the step S4 is performed:
cleaning the crystallizer, polishing the surfaces of the graphite ring and the adapter plate by high-quality steel wool with the mark number of 0000 along the clockwise or anticlockwise direction, strictly prohibiting clockwise and anticlockwise cross polishing, polishing along one direction, and enabling the surface of the graphite ring to have no visible scratches after polishing.
Proportioning purified water and 3000 meshes of talcum powder according to a mass ratio of 4:3, mixing all the talcum powder with 1/2 purified water, controlling the water temperature of the purified water at 28 ℃, repeatedly kneading for 6min, then adding the rest 1/2 purified water, repeatedly kneading until the talcum powder paste is fine and uniform and is not sticky, and then standing for 6 min.
The talc powder paste with the size of mung bean is cut by the forefinger, and is smeared at the joint of the graphite ring and the adapter plate along the clockwise direction or the anticlockwise direction, and the talc powder paste is pressed with a certain force during smearing, so that no cavity is formed in the talc powder paste after smearing is finished, and the width of the talc powder paste is 3cm when smearing is finished.
After the steps are completed, immediately brushing a layer of edible vegetable oil on the surface of the talcum powder paste, brushing the surface of the talcum powder paste completely at one time during oil brushing, so that the edible vegetable oil can permeate into the surface of the talcum powder paste to enable the surface of the talcum powder paste to be smoother and finer, and the wettability of the talcum powder paste can be kept, and then performing step S4 within 40 minutes.
Through actual detection, the technical indexes of the aluminum alloy round bar cast by the steps are as follows:
| deviation of diameter | Degree of curvature | Shrinkage cavity | Segregation phase | Cold partition | Ring grain | Slag inclusion | Stain of corrosion | Strain injury | Pulling crack | Length of casting |
| ±0.3mm | 0.15mm | Is free of | 450-550um | Is free of | Is free of | Is free of | Is free of | ≤0.4mm | Is free of | 8100mm |
The aluminum alloy round bar has small segregation layer, high surface quality and few metallurgical defects.
Example 5: a hot top casting process of a 7-series aluminum alloy round rod comprises the following steps:
s1, preparing materials: the materials are prepared according to the following mass percentage:
and S2, melting.
And S3, refining.
And S4, casting. Wherein the casting speed is 110 mm/min; the casting temperature is 690 ℃; the cooling strength is: the water temperature of a cooling water inlet is 20 ℃, the flow of the cooling water is 2500L/min, and the water pressure of the cooling water is as follows: 3kg/cm2(ii) a The liquid level of the die disc is closely monitored according to actual production requirements.
The following step S4' is performed before the step S4 is performed:
cleaning the crystallizer, polishing the surfaces of the graphite ring and the adapter plate by high-quality steel wool with the mark number of 0000 along the clockwise or anticlockwise direction, strictly prohibiting clockwise and anticlockwise cross polishing, polishing along one direction, and enabling the surface of the graphite ring to have no visible scratches after polishing.
Proportioning purified water and 3000 meshes of talcum powder according to a mass ratio of 4:3, mixing all the talcum powder with 1/2 purified water, controlling the water temperature of the purified water at 25 ℃, repeatedly kneading for 5min, then adding the rest 1/2 purified water, repeatedly kneading until the talcum powder paste is fine and uniform and is not sticky, and then standing for 5 min.
The talc powder paste with the size of mung bean is cut by the forefinger, and is smeared at the joint of the graphite ring and the adapter plate along the clockwise direction or the anticlockwise direction, and the talc powder paste is pressed with a certain force during smearing, so that no cavity is formed in the talc powder paste after smearing is finished, and the width of the talc powder paste is 2cm when smearing is finished.
After the steps are completed, immediately brushing a layer of edible vegetable oil on the surface of the talcum powder paste, brushing the surface of the talcum powder paste completely at one time during oil brushing, so that the edible vegetable oil can permeate into the surface of the talcum powder paste to enable the surface of the talcum powder paste to be smoother and finer, and the wettability of the talcum powder paste can be kept, and then performing step S4 within 40 minutes.
Through actual detection, the technical indexes of the aluminum alloy round bar cast by the steps are as follows:
| deviation of diameter | Degree of curvature | Shrinkage cavity | Segregation phase | Cold partition | Ring grain | Slag inclusion | Stain of corrosion | Strain injury | Pulling crack | Length of casting |
| ±0.35mm | 0.4mm | ≤0.2mm | 400-430um | Is free of | Is free of | Is free of | Is free of | ≤0.2mm | Is free of | 8500mm |
The aluminum alloy round bar has small segregation layer, high surface quality and few metallurgical defects.
Example 6: a hot top casting process of a 7-series aluminum alloy round rod comprises the following steps:
s1, preparing materials: the materials are prepared according to the following mass percentage:
and S2, melting.
And S3, refining.
And S4, casting. Wherein the casting speed is 140 mm/min; the casting temperature is 710 ℃; the cooling strength is: the temperature of cooling water at the inlet is 30 ℃, and the flow of cooling water isAmount 3500L/min, cooling water pressure: 6kg/cm2(ii) a The liquid level of the die disc is closely monitored according to actual production requirements.
The following step S4' is performed before the step S4 is performed:
cleaning the crystallizer, polishing the surfaces of the graphite ring and the adapter plate by high-quality steel wool with the mark number of 0000 along the clockwise or anticlockwise direction, strictly prohibiting clockwise and anticlockwise cross polishing, polishing along one direction, and enabling the surface of the graphite ring to have no visible scratches after polishing.
Proportioning purified water and 3000 meshes of talcum powder according to a mass ratio of 4:3, mixing all the talcum powder with 1/2 purified water, controlling the water temperature of the purified water at 35 ℃, repeatedly kneading for 6min, then adding the rest 1/2 purified water, repeatedly kneading until the talcum powder paste is fine and uniform and is not sticky, and then standing for 10 min.
The talc powder paste with the size of mung bean is cut by the forefinger, and is smeared at the joint of the graphite ring and the adapter plate along the clockwise direction or the anticlockwise direction, and the talc powder paste is pressed with a certain force during smearing, so that no cavity is formed in the talc powder paste after smearing is finished, and the width of the talc powder paste is 3cm when smearing is finished.
After the steps are completed, immediately brushing a layer of edible vegetable oil on the surface of the talcum powder paste, brushing the surface of the talcum powder paste completely at one time during oil brushing, so that the edible vegetable oil can permeate into the surface of the talcum powder paste to enable the surface of the talcum powder paste to be smoother and finer, and the wettability of the talcum powder paste can be kept, and then performing step S4 within 40 minutes.
Through actual detection, the technical indexes of the aluminum alloy round bar cast by the steps are as follows:
| deviation of diameter | Degree of curvature | Shrinkage cavity | Segregation phase | Cold partition | Ring grain | Slag inclusion | Stain of corrosion | Strain injury | Pulling crack | Length of casting |
| ±0.3mm | 0.15mm | Is free of | 450-550um | Is free of | Is free of | Is free of | Is free of | ≤0.4mm | Is free of | 8100mm |
The aluminum alloy round bar has small segregation layer, high surface quality and few metallurgical defects.
According to the hot top casting process of the aluminum alloy round bar, purified water which is more environment-friendly than mineral lubricating oil is adopted, the water temperature is controlled, and the talc powder with high number is selected, so that the caking property of the water and the talc powder after kneading is stronger. The graphite ring and the adapter plate are polished by the 0000 steel wool, so that the talcum powder paste is more firmly bonded with the graphite ring and the adapter plate and is not easy to fall off during high-temperature casting. Edible vegetable oil is brushed on the surface of the talcum powder paste for lubrication, so that the surface of the talcum powder paste is smoother and finer. Thereby improving the surface quality of the aluminum alloy round bar cast by the hot top. The technological parameters such as casting speed, casting temperature, cooling water inlet water temperature, cooling water flow, cooling water pressure and the like are reasonably controlled during hot-top casting, so that the parameters are well matched, stable continuous casting is realized, and the metallurgical defects of the aluminum alloy round bar cast by the hot-top are effectively reduced. In addition, through good component optimization, 7-series aluminum alloy round bars with different types of small segregation layers, high surface quality and low metallurgical defects can be cast according to requirements, and the requirements of downstream manufacturers on the aluminum alloy round bars can be fully met.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.
Claims (8)
1. A hot top casting process of a 7-series aluminum alloy round rod comprises the following steps:
s1: preparing materials;
s2: melting;
s3: refining;
s4: casting;
it is characterized in that the preparation method is characterized in that,
the step S4 is also preceded by a step S4': cleaning the crystallizer, and polishing the surfaces of the graphite ring and the adapter plate after cleaning; mixing purified water and talcum powder and repeatedly kneading to form talcum powder paste, adding purified water again and repeatedly kneading until the talcum powder paste is fine and uniform, and then standing; smearing the talc powder paste at the joint of the graphite ring and the adapter plate, pressing the talc powder paste during smearing, and ensuring that no cavity exists in the talc powder paste after smearing is finished; after the talcum powder paste is coated, brushing a layer of edible vegetable oil on the surface of the talcum powder paste; thereafter, step S4 was performed within 40 minutes;
in the step S4, the casting speed is 100-140 mm/min; the casting temperature is 690 and 710 ℃; the water temperature of the cooling water inlet is less than 30 ℃, the flow rate of the cooling water is 2500-2。
2. The hot-top casting process according to claim 1, wherein in step S1, the following ingredients are mixed in percentage by mass:
si: less than or equal to 0.15 percent; fe: less than or equal to 0.2 percent; cu: 0.03-0.12%; mn: 0.12 to 0.18 percent; mg: 0.75-0.9%; cr: less than or equal to 0.15 percent; zn: 5.45 to 5.65 percent; ti: less than or equal to 0.1 percent; impurities: the single component is less than or equal to 0.05 percent, and the total amount is less than or equal to 0.15 percent; the balance being Al.
3. The hot-top casting process according to claim 1, wherein in step S4', steel wool with the reference number 0000 is used to grind the graphite ring and the surface of the adapter plate in a clockwise or counterclockwise direction, and no scratch is observed on the surface of the graphite ring after grinding.
4. The hot-top casting process according to claim 1, wherein in step S4', the purified water and the talc powder are mixed in a mass ratio of 4: 3.
5. The hot-top casting process according to claim 4, wherein all the talc powder is mixed with 1/2 pure water, the water temperature of the pure water is controlled at 25-35 ℃, and the talc powder paste is formed by repeatedly kneading for 5-6 min;
adding the rest 1/2 purified water, kneading repeatedly for 5-6min until the pulvis Talci paste is fine and uniform, and standing for 5-10 min.
6. The hot-top casting process of claim 1, wherein in step S4', the talc powder is 3000 mesh.
7. The hot-top casting process according to claim 1, wherein in the step S4', the talc powder paste is applied to the joint of the graphite ring and the adapter plate in a clockwise or counterclockwise direction.
8. The hot-top casting process according to claim 1, wherein the width of the talc powder paste is 2-3 cm when the application is completed.
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| JP4907248B2 (en) * | 2006-07-14 | 2012-03-28 | 三協マテリアル株式会社 | Continuous casting method of Al-Si aluminum alloy |
| CN102328065B (en) * | 2011-07-20 | 2013-03-13 | 辽宁忠旺集团有限公司 | Hot-top casting process of 7075 aluminium alloy round rod with diameter of phi582 mm |
| CN103194300B (en) * | 2013-04-07 | 2016-06-29 | 昆明理工大学 | A kind of High-temperature antioxidant wearable lubricant and preparation method thereof |
| CN103480613B (en) * | 2013-09-06 | 2015-01-21 | 国家电网公司 | Insulating sleeve cleaner |
| CN203900443U (en) * | 2014-06-24 | 2014-10-29 | 亚太轻合金(南通)科技有限公司 | Arc-shaped adapter plate for connecting graphite ring with flow guide pipe |
| JP6417133B2 (en) * | 2014-07-04 | 2018-10-31 | 昭和電工株式会社 | Aluminum alloy for continuous casting and method for producing continuous cast material |
| CN105347829B (en) * | 2015-12-10 | 2018-06-22 | 西南铝业（集团）有限责任公司 | A kind of hot direct casting, which is made, uses material for repairing |
| CN107022699A (en) * | 2016-01-29 | 2017-08-08 | 银锚铝业股份公司 | A kind of cast aluminium alloy gold and casting technique |
| CN105734369B (en) * | 2016-04-21 | 2017-12-22 | 辽宁忠旺集团有限公司 | The heat top casting technique of φ 784mm 7xxx 7 series extra super duralumin alloy poles |
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