CN111014623B - Semi-continuous casting method for large-size copper-magnesium alloy slab ingot - Google Patents
Semi-continuous casting method for large-size copper-magnesium alloy slab ingot Download PDFInfo
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- 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
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/025—Casting heavy metals with high melting point, i.e. 1000 - 1600 degrees C, e.g. Co 1490 degrees C, Ni 1450 degrees C, Mn 1240 degrees C, Cu 1083 degrees C
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- 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
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- 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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Abstract
The invention relates to a semi-continuous casting method of a copper-magnesium alloy large-size slab ingot, belonging to the field of nonferrous metal processing. The method comprises the following steps: the semi-continuous casting method comprises the steps of melting a copper-magnesium alloy raw material, covering a covering agent on the surface of the melt, stirring, standing, removing slag, degassing, pouring a copper-magnesium alloy melt into a crystallizer cooled by circulating water, pulling the melt out of the crystallizer through a traction device after the melt begins to solidify into a blank shell, and continuously spraying water for cooling, so that an ingot is obtained.
Description
Technical Field
The invention relates to a semi-continuous casting method of a copper-magnesium alloy large-size slab ingot, belonging to the field of nonferrous metal processing.
Background
With the rapid development of the current electronic information industry technology, the development of electronic components towards high performance, precision and miniaturization is accelerated, higher requirements on the strength, conductivity and reliability of the used materials are provided, and the method is mainly embodied in the following aspects: the high-strength heat-conducting composite material has high electric conductivity and heat-conducting property, good fatigue strength resistance, stress relaxation resistance, complex bending property and forming property.
The Cu-Mg alloy (the magnesium content is less than 3 wt%) belongs to solid solution strengthening type alloy, has higher strength and electric conductivity and excellent stress relaxation resistance, the tensile strength of the alloy reaches 650MPa, the electric conductivity can keep more than 60% IACS, and the Cu-Mg alloy is a material with excellent balance of strength and electric conductivity and can be applied to the fields of terminals, relays, lithium batteries and the like.
However, because magnesium element is easily oxidized in a non-vacuum environment, slag formation, air suction and other phenomena are easily generated on a melt, so that defects such as air holes, cold shut and the like are generated on a cast ingot, the subsequent processing and heat treatment of the alloy are influenced, and the higher the magnesium content is, the greater the casting difficulty is. Under the condition of melting state, magnesium is easy to produce violent chemical reaction with oxygen, nitrogen and water vapor in the air, if the surface of the melt body is not protected, the magnesium liquid can be quickly oxidized and combusted at the temperature of being close to 800 ℃, a large amount of heat is emitted, the reaction heat is continuously increased, and the oxidation of magnesium is intensified, so that the burning loss of the magnesium liquid, the oxidation of alloy and even combustion explosion are caused. Therefore, during the smelting and casting process of the copper-magnesium alloy, the reaction of the magnesium liquid with air and furnace gas must be avoided as much as possible. The copper-magnesium alloy has the defects of easy oxidation, large melt viscosity, easy slag formation, easy air suction, ingot casting pores, cracks and the like in the non-vacuum smelting process, and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a semi-continuous casting method capable of reducing oxidation of a copper-magnesium alloy melt and reducing the viscosity of the melt.
The purpose of the invention is realized by the following technical scheme:
a semi-continuous casting method for a large-size copper-magnesium alloy slab ingot comprises the steps of smelting copper-magnesium alloy, refining and semi-continuous casting, wherein the refining and semi-continuous casting are carried out under the protection of gas, the temperature of a solution in a semi-continuous casting crystallizer is controlled to be 1130-1150 ℃, the casting speed is 70-80mm/min, and the flow rate of cooling water is as follows: 65-80m3H, number of crystallizer oscillations: 50-60 times/min.
The semi-continuous casting method has the advantages of high production rate, low casting cost, simplicity in operation and the like.
Along with the increase of the casting temperature, the air suction amount of the melt is increased, a large amount of hydrogen is separated out in the form of air holes in the solidification process to form air hole defects, the casting temperature is high, the existence time of a solid-liquid two-phase region in the central area of the casting blank is long in the solidification process, liquid which is not solidified still exists between the crystallized dendrites at the end of solidification, the liquid is called as a liquid film, the tensile stress value received by the casting blank is continuously increased due to solidification shrinkage, the liquid film is pulled to crack due to the existence of the tensile stress, at the moment, cracks are generated due to the fact that no more liquid is used for filling up the pulled cracks, the cracks are called as thermal cracks, and the higher the casting temperature is, and the thermal cracks along the crystal are more easily generated in the solidification area of the casting blank. The viscosity of the copper-magnesium alloy melt is extremely high, such as the casting temperature is too low, the copper liquid fluidity is poor, the solidification shrinkage is short due to the existence of a solid-liquid ring two-phase region in the central region of a casting blank in the solidification process, and the cold shut defect of the casting blank is caused, and the temperature of the solution of the semi-continuous casting crystallizer is controlled to be 1130-.
The casting speed is controlled to be 70-80mm/min because the higher the casting speed is, the more heat brought into the casting blank in unit time is, the less the solidification amount of the alloy liquid at the middle upper part of the crystallizer is, the depth of a liquid cavity is correspondingly increased, the temperature gradient of the casting blank is increased under the action of secondary cooling, the solidification speed is accelerated, at the moment, the shrinkage of the casting blank is increased, so that the defects of larger stress is generated, the lower the casting speed is, the cooling is strong, the resistance during casting is too large, cracks or cold shut and the like are easily formed, and the production efficiency is low.
The flow rate of cooling water is controlled to be 65-80m3The reason is that the lower the temperature of the surface of the casting blank is, the larger the temperature gradient inside the casting blank is, the faster the shrinkage of the casting blank is, the greater the equivalent stress inside the casting blank is, because the intensity of the cooling flow is too high,cold cracking is easily generated.
The crystallizer is subjected to vibration casting, the surface quality of the cast ingot can be improved, the effects of removing adhesion, slag removal and the like on the wall of the crystallizer in the casting process are effectively achieved, the vibration frequency is too high, the phenomenon of leakage caused by large fluctuation of the liquid surface during casting is caused, and the effect of improving the surface of the cast ingot is avoided if the vibration frequency is too low, so that the phenomenon of leakage caused by leakage is avoided and the surface effect of the cast ingot is also improved if the vibration frequency of the crystallizer is controlled to be 50-60 times/minute.
In the semi-continuous casting method of the large-size copper-magnesium alloy slab ingot, the copper-magnesium alloy comprises the following components in percentage by mass: mg: 0.5-0.8%, P < 0.015%, Zn < 0.003%, Fe < 0.02%, Pb < 0.004%, Ni < 0.004%, and the balance of Cu.
The influence of magnesium on the mechanical properties of the copper-magnesium alloy is mainly to prolong the lasting fracture time and improve the lasting plasticity, but in the strengthening process, an optimal magnesium content area exists, the best strengthening effect cannot be obtained in the area lower than or higher than the area, the content of magnesium is optimized in production, which is related to the solid solution strengthening of the copper-magnesium alloy on one hand and the cold hardening in the later period on the other hand, the quality of cast ingots is reduced due to overhigh magnesium content, cracks and the like are generated, the magnesium content is too low, the strength of the cast ingots cannot meet the requirements, and the cast ingots are scrapped, so the magnesium content of the copper-magnesium alloy is controlled to be 0.5-0.8% most reasonably.
Phosphorus is the most effective deoxidizer with the lowest cost, and the existence of trace phosphorus can improve the fluidity of a melt, improve the welding performance and the corrosion resistance of copper and alloy and improve the softening resistance. The copper-magnesium alloy casting raw material of the invention is added with 20 percent of Cu-Mg, 20 percent of Cu-P intermediate alloy and an electrolytic copper plate according to the proportion, and the intermediate alloy is an additive functional alloy material, so that the copper-magnesium alloy casting raw material has lower melting point, higher dissolution speed, more stable actual yield and stronger capability of improving the alloy performance in the melting process.
In the semi-continuous casting method for the large-size copper-magnesium alloy slab ingot, the surface of a melt is covered with a first covering agent during smelting of the copper-magnesium alloy, the thickness of the first covering agent is larger than 20mm, and then a second covering agent is superposed on the surface of the first covering agent, and the thickness of the second covering agent is larger than 20 mm.
This application covering agent adopts the double-deck cover on the covering agent two superposes covering agent one, such covering surface tension is little, protective force and covering power are big, can form the good protective layer of one deck on smelting furnace solution surface, the entering of oxygen in the air outside the effective separation molten bath, the oxidation loss of alloying element in the smelting process has been avoided, and have the heat preservation effect, can also promote going on of reaction, and exert low temperature simultaneously and cover and high temperature refining's dual function, along with the increase of smelting the temperature, MgF in the covering agent one2Can improve the melting point of the solvent and play a role of high-temperature refining.
In the semi-continuous casting method of the large-size copper-magnesium alloy slab ingot, the covering agent comprises the following components in percentage by mass: CaF2：15％-18％、CaCO3：5％-8％、MgF2：10％-15％、Na3AlF6： 50％-55％、Na2CO3: 15 to 20 percent. Wherein CaF is added2Because of CaF2The flux has the advantages of reducing the melting point of refractory substances, promoting the flow, well separating slag from copper-magnesium alloy, dephosphorizing in the smelting process and enhancing the malleability of metal. On the basis, MgF is also added2，MgF2Can increase Na content2CO3、CaF2Equal flux refining capacity due to MgF2The MgO has the capacity of chemical combination slagging, which is because the solubility of the MgO in the flux is improved after the villiaumite is added.
In the semi-continuous casting method of the large-size copper-magnesium alloy slab ingot, the covering agent II is one or two of charcoal or graphite powder. The charcoal and the graphite have good heat insulation performance, and also have a reduction effect on the copper liquid, so that the oxygen content in the copper liquid can be greatly reduced.
In the semi-continuous casting method for the large-size copper-magnesium alloy slab ingot, the smelting temperature of the copper-magnesium alloy is 1150-1180 ℃.
In the semi-continuous casting method of the large-size copper-magnesium alloy slab ingot, refining comprises stirring, standing, deslagging and degassing, wherein the stirring time of a solution is 25-35min, the standing time of the solution is 35-45min, and the degassing time is 25-30 min.
In the semi-continuous casting method for the large-size copper-magnesium alloy slab ingot, the protective gas is argon. Hydrogen and oxygen are harmful elements, the copper-magnesium alloy is easily oxidized at high temperature, the compactness of an alloy casting blank is reduced, cracks appear, the solubility of hydrogen in high-temperature copper liquid is high, the solubility of hydrogen is reduced when the copper liquid is cooled, hydrogen is separated out in a bubble shape, and oxygen is dissolved in the copper liquid in the form of Cu2The existence of O causes the reduction of the fluidity of copper liquid, thereby causing the oxidation inclusion of casting blanks and obviously reducing the mechanical properties of the casting blanks, and the argon is rare gas and has inactive chemical property, and can isolate air and prevent secondary oxidation and combustion by being used as protective gas.
Compared with the prior art, the method has the advantages that through the application of different covering agents, argon is used as protective gas in the refining and semi-continuous casting processes, and through reasonable setting of different casting process parameters, oxygen in air outside a molten pool is effectively prevented from entering, oxidation burning loss of alloy elements in the smelting process is avoided, a good heat preservation effect is achieved, the defects that copper-magnesium alloy is easy to oxidize, easy to slag and suck air and the like in the non-vacuum smelting process are overcome, the defects that ingot casting pores, cracks and the like are overcome, and the obtained copper-magnesium alloy ingot casting is free of cracks, smooth and clean in surface and stable in components.
Detailed Description
The following are specific examples of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.
Example 1:
semi-continuously casting to obtain an alloy ingot of Cu-0.55Mg-0.012P with the length of 5320mm
(1) Calculating the components (0.55 percent of Mg, 0.012 percent of P, 0.003 percent of Zn, 0.02 percent of Fe, 0.004 percent of Pb, 0.004 percent of Ni and the balance of Cu) of the required dry raw material copper-magnesium alloy according to the weight percentage, wherein the raw materials comprise 20 percent of Cu-Mg intermediate alloy, 20 percent of Cu-P intermediate alloy and electrolytic copper;
(2) in a 6T smelting furnace, 20 percent of Cu-Mg intermediate alloy, 20 percent of Cu-P intermediate alloy and electrolytic copper are added in sequenceSmelting at 1160 deg.C, covering agent one (CaF as mass percentage)2：15％、CaCO3：5％、MgF2：15％、Na3AlF6： 50％、Na2CO3: 15%) is added on the surface of the solution, the covering thickness is more than 20mm, 50% of charcoal and 50% of graphite powder are mixed to be used as a covering agent II to be superposed on the covering agent I, the covering thickness is more than 20mm, and the molten copper cannot be exposed in the smelting process;
(3) melt refining: stirring for 30min after the raw materials are completely dissolved, standing the solution for 40min, removing the slag of the solution, introducing protective gas for degassing for 30 min;
(4) semi-continuous casting: adopting protective gas to protect the convection groove in the pouring process, controlling the temperature of a crystallizer solution at 1140 ℃, the casting speed at 75mm/min, and the cooling water flow: 73m3H, number of crystallizer oscillations: 55 times/min, and obtaining an alloy ingot with the specification size of 190 x 610mm and the length of 5320mm, namely Cu-0.55 Mg-0.012P.
Example 2:
semi-continuously casting to obtain an alloy ingot casting ingot of Cu-0.65Mg-0.009P with the length of 5320mm
(1) Calculating the components (0.65 percent of Mg, 0.009 percent of P, 0.003 percent of Zn, 0.02 percent of Fe, 0.004 percent of Pb, 0.004 percent of Ni and the balance of Cu) of the required dry raw material copper-magnesium alloy according to the weight percentage, wherein the raw materials comprise 20 percent of Cu-Mg intermediate alloy, 20 percent of Cu-P intermediate alloy and electrolytic copper;
(2) sequentially adding 20% of Cu-Mg intermediate alloy, 20% of Cu-P intermediate alloy and electrolytic copper into a 6T smelting furnace for smelting at the smelting temperature of 1160 ℃, wherein a covering agent I (the component of CaF in percentage by mass) is added in the smelting process2：15％、CaCO3：5％、MgF2：15％、Na3AlF6： 50％、Na2CO3: 15%) is added on the surface of the solution, the covering thickness is more than 20mm, 50% of charcoal and 50% of graphite powder are mixed to be used as a covering agent II to be superposed on the covering agent I, the covering thickness is more than 20mm, and the molten copper cannot be exposed in the smelting process;
(3) melt refining: stirring for 30min after the raw materials are completely dissolved, standing the solution for 40min, removing the slag of the solution, introducing protective gas for degassing for 30 min;
(4) semi-continuous casting: adopting protective gas to protect the convection groove in the pouring process, controlling the temperature of a crystallizer solution at 1140 ℃, the casting speed at 75mm/min, and the cooling water flow: 73m3H, number of crystallizer oscillations: 55 times/min, an ingot of Cu-0.65Mg-0.009P with a gauge size of 190 x 610mm and a length of 5320mm was obtained.
Example 3:
semi-continuously casting an alloy ingot with the length of 5320mm and Cu-0.76Mg-0.013P
(1) Calculating the components of the required dry raw material copper-magnesium alloy (0.76 percent of Mg, 0.013 percent of P, 0.003 percent of Zn, 0.02 percent of Fe, 0.004 percent of Pb, 0.004 percent of Ni and the balance of Cu) according to the weight percentage, wherein the raw materials comprise 20 percent of Cu-Mg intermediate alloy, 20 percent of Cu-P intermediate alloy and electrolytic copper;
(2) sequentially adding 20% of Cu-Mg intermediate alloy, 20% of Cu-P intermediate alloy and electrolytic copper into a 6T smelting furnace for smelting at the smelting temperature of 1160 ℃, wherein a covering agent I (the component of CaF in percentage by mass) is added in the smelting process2：15％、CaCO3：5％、MgF2：15％、Na3AlF6： 50％、Na2CO3: 15%) is added on the surface of the solution, the covering thickness is more than 20mm, 50% of charcoal and 50% of graphite powder are mixed to be used as a covering agent II to be superposed on the covering agent I, the covering thickness is more than 20mm, and the molten copper cannot be exposed in the smelting process;
(3) melt refining: stirring for 30min after the raw materials are completely dissolved, standing the solution for 40min, removing the slag of the solution, introducing protective gas for degassing for 30 min;
(4) semi-continuous casting: adopting protective gas to protect the convection groove in the pouring process, controlling the temperature of a crystallizer solution at 1140 ℃, the casting speed at 75mm/min, and the cooling water flow: 73m3H, number of crystallizer oscillations: 55 times/min, and obtaining an alloy ingot with the specification size of 190 x 610mm and the length of 5320mm, Cu-0.76 Mg-0.013P.
Example 4:
semi-continuously casting an alloy ingot with the length of 5320mm and Cu-0.35Mg-0.011P
(1) Calculating the components (0.35 percent of Mg, 0.011 percent of P, 0.003 percent of Zn, 0.02 percent of Fe, 0.004 percent of Pb, 0.004 percent of Ni and the balance of Cu) of the required dry raw material copper-magnesium alloy according to the weight percentage, wherein the raw materials comprise 20 percent of Cu-Mg intermediate alloy, 20 percent of Cu-P intermediate alloy and electrolytic copper;
(2) sequentially adding 20% of Cu-Mg intermediate alloy, 20% of Cu-P intermediate alloy and electrolytic copper into a 6T smelting furnace for smelting at the smelting temperature of 1160 ℃, wherein a covering agent I (the component of CaF in percentage by mass) is added in the smelting process2：15％、CaCO3：5％、MgF2：15％、Na3AlF6： 50％、Na2CO3: 15%) is added on the surface of the solution, the covering thickness is more than 20mm, 50% of charcoal and 50% of graphite powder are mixed to be used as a covering agent II to be superposed on the covering agent I, the covering thickness is more than 20mm, and the molten copper cannot be exposed in the smelting process;
(3) melt refining: stirring for 30min after the raw materials are completely dissolved, standing the solution for 40min, removing the slag of the solution, introducing protective gas for degassing for 30 min;
(4) semi-continuous casting: adopting protective gas to protect the convection groove in the pouring process, controlling the temperature of a crystallizer solution at 1140 ℃, the casting speed at 75mm/min, and the cooling water flow: 73m3H, number of crystallizer oscillations: 55 times/min, and obtaining an alloy ingot with the specification size of 190 x 610mm and the length of 5320mm, namely Cu-0.35 Mg-0.011P.
Example 5:
semi-continuously casting an alloy ingot with the length of 5320mm and Cu-0.42Mg-0.012P
(1) Calculating the components (0.42 percent of Mg, 0.012 percent of P, 0.003 percent of Zn, 0.02 percent of Fe, 0.004 percent of Pb, 0.004 percent of Ni and the balance of Cu) of the required dry raw material copper-magnesium alloy according to the weight percentage, wherein the raw materials comprise 20 percent of Cu-Mg intermediate alloy, 20 percent of Cu-P intermediate alloy and electrolytic copper;
(2) adding 20 percent of Cu-Mg intermediate alloy, 20 percent of Cu-P intermediate alloy and electrolytic copper in sequence in a 6T smelting furnace for smelting at the smelting temperature of 1160 DEG CDuring smelting, covering agent I (the percentage by mass of the components is CaF)2：15％、CaCO3：5％、MgF2：15％、Na3AlF6： 50％、Na2CO3: 15%) is added on the surface of the solution, the covering thickness is more than 20mm, 50% of charcoal and 50% of graphite powder are mixed to be used as a covering agent II to be superposed on the covering agent I, the covering thickness is more than 20mm, and the molten copper cannot be exposed in the smelting process;
(3) melt refining: stirring for 30min after the raw materials are completely dissolved, standing the solution for 40min, removing the slag of the solution, introducing protective gas for degassing for 30 min;
(4) semi-continuous casting: adopting protective gas to protect the convection groove in the pouring process, controlling the temperature of a crystallizer solution at 1140 ℃, the casting speed at 75mm/min, and the cooling water flow: 73m3H, number of crystallizer oscillations: 55 times/min, and obtaining an alloy ingot with the specification size of 190 x 610mm and the length of 5320mm, namely Cu-0.42 Mg-0.012P.
Example 6:
semi-continuously casting an alloy ingot with the length of 5320mm and Cu-0.85Mg-0.013P
(1) Calculating the components (0.85 percent of Mg, 0.013 percent of P, 0.003 percent of Zn, 0.02 percent of Fe, 0.004 percent of Pb, 0.004 percent of Ni and the balance of Cu) of the required dry raw material copper-magnesium alloy according to the weight percentage, wherein the raw materials comprise 20 percent of Cu-Mg intermediate alloy, 20 percent of Cu-P intermediate alloy and electrolytic copper;
(2) sequentially adding 20% of Cu-Mg intermediate alloy, 20% of Cu-P intermediate alloy and electrolytic copper into a 6T smelting furnace for smelting at the smelting temperature of 1160 ℃, wherein a covering agent I (the component of CaF in percentage by mass) is added in the smelting process2：15％、CaCO3：5％、MgF2：15％、Na3AlF6： 50％、Na2CO3: 15%) is added on the surface of the solution, the covering thickness is more than 20mm, 50% of charcoal and 50% of graphite powder are mixed to be used as a covering agent II to be superposed on the covering agent I, the covering thickness is more than 20mm, and the molten copper cannot be exposed in the smelting process;
(3) melt refining: stirring for 30min after the raw materials are completely dissolved, standing the solution for 40min, removing the slag of the solution, introducing protective gas for degassing for 30 min;
(4) semi-continuous casting: adopting protective gas to protect the convection groove in the pouring process, controlling the temperature of a crystallizer solution at 1140 ℃, the casting speed at 75mm/min, and the cooling water flow: 73m3H, number of crystallizer oscillations: 55 times/min, and obtaining an alloy ingot with the specification size of 190 x 610mm and the length of 5320mm, Cu-0.85 Mg-0.013P.
Example 7:
semi-continuously casting alloy ingot with the length of 5320mm and Cu-0.93Mg-0.010P
(1) Calculating the components (0.93 percent of Mg, 0.010 percent of P, 0.003 percent of Zn, 0.02 percent of Fe, 0.004 percent of Pb, 0.004 percent of Ni and the balance of Cu) of the required dry raw material copper-magnesium alloy according to the weight percentage, wherein the raw materials comprise 20 percent of Cu-Mg intermediate alloy, 20 percent of Cu-P intermediate alloy and electrolytic copper;
(2) sequentially adding 20% of Cu-Mg intermediate alloy, 20% of Cu-P intermediate alloy and electrolytic copper into a 6T smelting furnace for smelting at the smelting temperature of 1160 ℃, wherein a covering agent I (the component of CaF in percentage by mass) is added in the smelting process2：15％、CaCO3：5％、MgF2：15％、Na3AlF6： 50％、Na2CO3: 15%) is added on the surface of the solution, the covering thickness is more than 20mm, 50% of charcoal and 50% of graphite powder are mixed to be used as a covering agent II to be superposed on the covering agent I, the covering thickness is more than 20mm, and the molten copper cannot be exposed in the smelting process;
(3) melt refining: stirring for 30min after the raw materials are completely dissolved, standing the solution for 40min, removing the slag of the solution, introducing protective gas for degassing for 30 min;
(4) semi-continuous casting: adopting protective gas to protect the convection groove in the pouring process, controlling the temperature of a crystallizer solution at 1140 ℃, the casting speed at 75mm/min, and the cooling water flow: 73m3H, number of crystallizer oscillations: 55 times/min, and obtaining an alloy ingot with the specification size of 190 × 610mm and the length of 5320mm, namely Cu-0.93 Mg-0.010P.
Comparative example 1:
the only difference from example 1 is that the coating agent is only coating agent two, which is a mixture of 50% charcoal and 50% graphite powder.
Comparative example 2:
the difference from example 1 is only that the covering agent is only (the percentage of the mass of the components is CaF)2：15％-18％、CaCO3：5％-8％、MgF2：10％-15％、Na3AlF6：50％-55％、 Na2CO3: 15% -20%) of covering agent one.
Comparative example 3:
the only difference from example 1 is that the cover thickness is 15 mm.
Comparative example 4:
the only difference from example 1 is that the crystallizer melt temperature is controlled at 1000 ℃.
Comparative example 5:
the only difference from example 1 is that the crystallizer melt temperature was controlled at 1200 ℃.
Comparative example 6:
the only difference from example 1 is that the casting speed was 60 mm/min.
Comparative example 7:
the only difference from example 1 is that the casting speed was 90 mm/min.
Comparative example 8:
the only difference from example 1 is the cooling water flow: 55m3/h。
Comparative example 9:
the only difference from example 1 is the cooling water flow: 90m3/h。
Comparative example 10:
the difference from example 1 is only in the number of times the mold was vibrated: 40 times per minute.
Comparative example 11:
the difference from example 1 is only in the number of times the mold was vibrated: 70 times per minute.
Table 1: EXAMPLES 1-7 alloy ingot Property test results
Table 2: comparative examples 1-11 alloy ingot casting ingot performance detection results
From the results, the magnesium content in the magnesium alloy ingot has great influence on the tensile strength and the elongation of the ingot, the magnesium content is controlled to be 0.5-0.8%, the tensile strength is excellent, the electric conductivity is excellent, and the elongation is good, so the large-size flat ingot obtained by covering the surface of the melt with the double-layer covering agent, using argon as a protective gas in the refining and semi-continuous casting processes and reasonably setting the parameters of different casting processes by using the semi-continuous casting method has stable components, excellent tensile strength, excellent electric conductivity, good elongation, and no pores or cracks on the surface.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.
Claims (5)
1. The semi-continuous casting method of the large-size copper-magnesium alloy slab ingot is characterized by comprising the step of semi-continuously casting the copper-magnesium alloy slab ingotSmelting, refining, semi-continuous casting, refining and semi-continuous casting are all carried out under the protection of gas, wherein the temperature of a semi-continuous casting crystallizer solution is controlled at 1130-: 65-80m, and the number of times of vibration of the crystallizer: 50-60 times/min; the copper-magnesium alloy comprises the following components in percentage by mass: mg: 0.5-0.8%, P less than 0.015%, Zn<0.003%，Fe<0.02%，Pb<0.004%，Ni<0.004%, and the balance of Cu; in the smelting process of the copper-magnesium alloy, firstly covering the surface of the melt with a first covering agent, wherein the thickness of the first covering agent is more than 20mm, and then overlapping a second covering agent on the surface of the first covering agent, wherein the thickness of the second covering agent is more than 20 mm; the covering agent comprises the following components in percentage by mass: CaF2：15%-18%、CaCO3：5%-8%、 MgF2：10%-15%、Na3AlF6：50%-55%、Na2CO3：15%-20%。
2. The semi-continuous casting method for large-size copper-magnesium alloy slab ingots according to claim 1, wherein the temperature for smelting the copper-magnesium alloy is 1150-1180 ℃.
3. The method of semi-continuous casting of large size copper magnesium alloy slab ingot according to claim 1, wherein the covering agent component is one or more of charcoal or graphite powder.
4. The semi-continuous casting method of the large-size copper-magnesium alloy slab ingot according to claim 1, wherein the refining comprises stirring, standing, deslagging and degassing, wherein the stirring time of the solution is 25-35min, the standing time of the solution is 35-45min, and the degassing time is 25-30 min.
5. The method of semi-continuous casting of a large-size copper-magnesium alloy slab ingot according to claim 1, wherein the protective gas is argon.
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