Electroslag remelting slag system for mirror mold steel electroslag remelting process

Abstract

The invention discloses an electroslag remelting slag system for an electroslag remelting process of mirror mold steel. The electroslag remelting slag system comprises electroslag remelting slag materials of CaF2, BaF2, MgF2, CaO, MgO, Al2O3, SiO2 and Li2O. The content of each electroslag remelting slag material is as follows by mass percentage: CaF2: 60%-66%, BaF2: 2%-6%, MgF2: 2%-6%, CaO: 8%-14%, MgO: 2%-6%, Al2O3: 8%-12%, SiO2: 4%-8%, Li2O: 2%-6%, and the rest is inevitable impurity residue, wherein the total content of CaF2+MgF2+BaF2 is controlled to be ≥70% by mass percentage, and the basicity (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled to be between 0.85 and 1.2. The electroslag remelting slag of the present invention is applied to the electroslag remelting of mirror mold steel, which can effectively reduce the brittle inclusions in the mold steel, promote the uniform distribution of the aluminum content in the mold steel, and fully meet the end-user's requirements for the polishing performance of the mirror mold steel.

Description

Technical Field

[0001] The invention belongs to the technical field of electroslag remelting of mirror-finished mold steel, and in particular relates to an electroslag remelting slag system used in an electroslag remelting process of mirror-finished mold steel. Background Art

[0002] Mirror mold steel is widely used in home appliance parts, electromechanical industrial parts, rubber products, ceramic products, plastic products, etc. The basic requirements of customers for mirror mold steel products are less inclusions and high polishing performance.

[0003] Electroslag remelting is an important part of the mirror mold steel manufacturing process. Electroslag remelting is a method of melting using the resistance heat generated when electric current passes through the molten slag as a heat source. During the electroslag remelting process, the electroslag remelting slag is in deep contact with the molten metal droplets and a chemical reaction occurs. Therefore, the final product quality of the mirror mold steel is closely related to the electroslag remelting slag.

[0004] At present, conventional electroslag remelting slag systems used in the electroslag remelting process of mirror mold steel include 7-3 slag system and 6-2-2 slag system. In the 7-3 slag system, the ratio of CaF2 and Al2O3 is 7:3. This electroslag remelting slag system has a relatively high melting point, and the Al2O3 content in the slag system is high, and the ability to remove oxide inclusions is relatively poor; in the 6-2-2 slag system, the ratio of CaF2, CaO and Al2O3 is 6:2:2. This electroslag remelting slag system improves the ability to remove inclusions, but still cannot meet the high polishing performance requirements of mirror mold steel. In addition, the use of conventional 7-3 slag system and 6-2-2 slag system for mirror mold steel electroslag remelting process usually has the problem of uneven aluminum content. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an electroslag remelting slag system for an electroslag remelting process of mirror mold steel, wherein the electroslag remelting slag materials contained in the electroslag remelting slag system are CaF2, BaF2, MgF2, CaO, MgO, Al2O3, SiO2, and Li2O, and the component contents of each electroslag remelting slag material are as follows by mass percentage: CaF2: 60% to 66%, BaF2: 2% to 6%, MgF2: 2% to 6%, CaO: 8% to 14%, MgO: 2% to 6%, Al2O3: 8% to 12%, SiO2: 4% to 8%, Li2O: 2% to 6%, and the rest are inevitable impurity residues, wherein the total content of CaF2+MgF2+BaF2 is controlled to be ≥70% by mass percentage, and the basicity (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled to be between 0.85 and 1.2.

[0006] Furthermore, in the above-mentioned electroslag remelting slag system used for the mirror mold steel electroslag remelting process, the electroslag remelting slag system is prepared by pre-melting the electroslag remelting slag materials CaF2, BaF2, MgF2, CaO, MgO, Al2O3, SiO2, and Li2O, cooling them to 25-100°C, and crushing them with a crusher.

[0007] Furthermore, in the electroslag remelting slag system used in the electroslag remelting process of mirror mold steel, the electroslag remelting slag system has a melting point of 1250-1280° C., an electrical conductivity of 1.5-3.1 S / cm, and a viscosity of 0.15-0.35 Pa·s at 1500° C.

[0008] Furthermore, in the above-mentioned electroslag remelting slag system used for the electroslag remelting process of mirror mold steel, the component content of each electroslag remelting slag material in the electroslag remelting slag system is controlled in mass percentage as follows: CaF2: 60.50%, BaF2: 4.80%, MgF2: 4.80%, CaO: 8.50%, MgO: 3.40%, Al2O3: 9.00%, SiO2: 6.70%, Li2O: 2.30%, the total content of CaF2+MgF2+BaF2 is controlled to be 70.10%, and the basicity (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled to be 1.17.

[0009] Furthermore, in the above-mentioned electroslag remelting slag system used for the electroslag remelting process of mirror mold steel, the component content of each electroslag remelting slag material in the electroslag remelting slag system is controlled in mass percentage as follows: CaF2: 63.50%, BaF2: 3.50%, MgF2: 3.40%, CaO: 9.20%, MgO: 2.50%, Al2O3: 9.50%, SiO2: 6.10%, Li2O: 2.30%, the total content of CaF2+MgF2+BaF2 is controlled to be 70.40%, and the basicity (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled to be 1.18.

[0010] Furthermore, in the above-mentioned electroslag remelting slag system used for the electroslag remelting process of mirror mold steel, the component content of each electroslag remelting slag material in the electroslag remelting slag system is controlled in mass percentage as follows: CaF2: 65.50%, BaF2: 2.30%, MgF2: 2.20%, CaO: 9.80%, MgO: 2.10%, Al2O3: 10.30%, SiO2: 5.70%, Li2O: 2.10%, the total content of CaF2+MgF2+BaF2 is controlled to 70.00%, and the basicity (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled to 1.19.

[0011] The electroslag remelting slag system used in the electroslag remelting process of mirror mold steel of the present invention has the following advantages and beneficial effects: the electroslag remelting slag system of the present invention is applied to the electroslag remelting of mirror mold steel, which can effectively reduce the brittle inclusions in the mold steel, promote the uniform distribution of the aluminum content in the mold steel, and fully meet the end users' requirements for the polishing performance of mirror mold steel. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0013] The composition contents of the electroslag remelting slag system used for the electroslag remelting process of mirror mold steel of the present invention are controlled as follows by mass percentage: CaF2: 60%-66%, BaF2: 2%-6%, MgF2: 2%-6%, CaO: 8%-14%, MgO: 2%-6%, Al2O3: 8%-12%, SiO2: 4%-8%, Li2O: 2%-6%, and the rest are inevitable impurity remainders, wherein the total content of low melting point system components CaF2+MgF2+BaF2 is controlled as ≥70% by mass percentage, and the basicity R=(CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled between 0.85 and 1.2.

[0014] The basic physical properties of the electroslag remelting slag system used in the electroslag remelting process of mirror mold steel of the present invention are: a melting point of 1250-1280°C, an electrical conductivity of 1.5-3.1 S / cm, and a viscosity of 0.15-0.35 Pa·s at 1500°C.

[0015] The method for using the electroslag remelting slag system for the electroslag remelting process of mirror mold steel of the present invention comprises:

[0016] (I) Preparation of electroslag remelting slag system

[0017] According to the composition content ratio of the electroslag remelting slag system, the electroslag remelting slag material CaF2, BaF2, MgF2, CaO, MgO, Al2O3, SiO2, and Li2O are pre-melted, then cooled to 25-100° C., crushed by a crusher, and vacuum-sealed for standby use. The content of the electroslag remelting slag material in the electroslag remelting slag system is controlled as follows by mass percentage: CaF2: 60%-66%, BaF2: 2%-6%, MgF2: 2%-6% , CaO: 8% ~ 14%, MgO: 2% ~ 6%, Al2O3: 8% ~ 12%, SiO2: 4% ~ 8%, Li2O: 2% ~ 6%, and the rest are inevitable impurity residues, and the total content of low melting point components CaF2 + MgF2 + BaF2 is controlled to be ≥ 70% by mass percentage, and the basicity R = (CaO + MgO + 0.5Li2O) / (SiO2 + 0.5Al2O3) is controlled between 0.85 and 1.2.

[0018] (II) Electroslag remelting of mirror mold steel

[0019] The prepared electroslag remelting slag system is applied to the smelting of mirror mold steel. The smelting process is carried out in an electroslag furnace and includes:

[0020] 1) Before electroslag remelting, the surface of the consumable electrode of the electroslag furnace must be carefully cleaned to ensure that there is no water seepage or leakage in the crystallizer and bottom water tank, and the condensed water on the inner wall of the crystallizer must be dried;

[0021] 2) Fully bake and dry the electroslag remelting slag, pour it into the slag mixing hopper, and stir and mix it evenly;

[0022] 3) During electroslag remelting, ensure various process parameters, control the current stability in the normal stage, control the surface quality and melting rate, ensure the surface and internal quality of the electroslag ingot are good, and after the arcing of the electroslag furnace is completed, add the electroslag remelting slag system into the electroslag furnace crystallizer for electroslag smelting.

[0023] In the electroslag remelting slag system used in the electroslag remelting process of mirror mold steel of the present invention, the reason why the content of each component in the electroslag remelting slag system is limited is that:

[0024] CaF2: 60%~66%

[0025] CaF2 is an indispensable component in the electroslag remelting slag system due to its low melting point. Adding a certain amount of CaF2 to the composite slag system can significantly reduce the liquidus temperature of the remelting slag. In order to ensure that the liquidus temperature reaches the target range, a small amount of BaF2 and MgF2 are mixed in the electroslag remelting slag system of the present invention.

[0026] BaF2: 2%~6%

[0027] BaF2 can stabilize the arc and keep the electroslag process going smoothly. It is used in conjunction with CaF2 and MgF2.

[0028] MgF2: 2%~6%

[0029] MgF2 is used in combination with CaF2 and BaF2 to form the composition basis of electroslag remelting slag with low melting point and low surface tension.

[0030] CaO: 8%~14%

[0031] The melting point of CaO is 2600°, which is a network-external oxide. Its role in the slag system is to increase the basicity of the slag and improve the desulfurization efficiency; it can significantly reduce the viscosity of the slag and absorb oxide inclusions in the steel, especially Al2O3.

[0032] MgO: 2%~6%

[0033] CaO in the slag system easily absorbs hydrogen. Adding MgO forms a semi-solidified film on the surface of the slag pool, reducing the heat loss from the slag surface to the atmosphere and reducing the permeability of hydrogen. MgO can reduce the viscosity, solidification point and activation energy of the slag. The addition of MgO can increase the fluidity of the slag while maintaining the same viscosity and softening point, but the amount of MgO added should not be too high.

[0034] Al2O3: 8%~12%

[0035] In the slag system, it can increase the viscosity of the slag, significantly reduce the electrical conductivity of the slag, reduce power consumption, and improve productivity. Adding Al2O3 to the slag will increase the viscosity of the slag, but it can reduce the solidification point of the slag, thereby improving the lubrication of the crystallizer.

[0036] SiO2: 4%~8%

[0037] It forms the basis of neutral slag, which can promote the uniform aluminum content in electroslag remelted steel.

[0038] Li2O: 2%~6%

[0039] It lowers the melting point of the slag system and is a strong flux that improves the fluidity of the slag. Li2O is added to the slag to destroy the chain structure of the protective slag, making the slag fluid and lowering the crystallization temperature, but excessive addition will increase the crystallization rate of the slag.

[0040] (CaF2+MgF2+BaF2)≥70%

[0041] Control the composition basis of the slag system's melting point and enhance the fluidity of the slag system.

[0042] (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3)=0.85~1.2

[0043] Forming neutral slag promotes uniform distribution of Al content.

[0044] The electroslag remelting slag system for the electroslag remelting process of mirror mold steel of the present invention is described in detail below in conjunction with specific embodiments.

[0045] Example 1

[0046] The component contents of the electroslag remelting slag system used in the electroslag remelting process of mirror mold steel in Example 1 of the present invention are controlled as follows in mass percentage: CaF2: 60.50%, BaF2: 4.80%, MgF2: 4.80%, CaO: 8.50%, MgO: 3.40%, Al2O3: 9.00%, SiO2: 6.70%, Li2O: 2.30%, the total content of CaF2+MgF2+BaF2 is controlled as 70.10% in mass percentage, and (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled as 1.17.

[0047] The basic physical properties of the electroslag remelting slag system are as follows: melting point 1250-1280°C, electrical conductivity 1.5-3.1 S / cm, and viscosity 0.15-0.35 Pa·s at 1500°C.

[0048] The method for using the electroslag remelting slag system for the electroslag remelting process of mirror mold steel according to embodiment 1 of the present invention comprises:

[0049] (I) Preparation of electroslag remelting slag system

[0050] The electroslag remelting slag is pre-melted according to the composition content ratio of the electroslag remelting slag system, and then cooled to 25-100° C., crushed by a crusher, and vacuum-sealed for standby use. The content of the electroslag remelting slag in the electroslag remelting slag system is controlled as follows by mass percentage: CaF2: 60.50%, BaF2: 4.80%, MgF2: 4.80%, CaO: 8.50%, MgO: 3.40%, Al2O3: 9.00%, SiO2: 6.70%, Li2O: 2.30%, the total content of CaF2+MgF2+BaF2 is controlled as 70.10% by mass percentage, and (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled as 1.17.

[0051] (II) Electroslag remelting of mirror mold steel

[0052] The prepared electroslag remelting slag system is applied to the smelting of mirror mold steel. The components of the target product of mirror plastic mold steel are as follows: C: 0.099%, Si: 0.30%, Mn: 0.31%, P: 0.017%, S: 0.001%, Cr: 7.96%, Ni: 0.43%, Cu: 0.22%, V: 0.18%, Al: 0.052%, N: 0.048% by mass percentage. The smelting process of the mirror mold steel is carried out in an electroslag furnace and includes:

[0053] 1) Before electroslag remelting, the surface of the consumable electrode of the electroslag furnace must be carefully cleaned to ensure that there is no water seepage or leakage in the crystallizer and bottom water tank, and the condensed water on the inner wall of the crystallizer must be dried;

[0054] 2) Bake the electroslag remelting slag at 750℃ for more than 12h, fully dry it, pour it into the slag mixing hopper, and stir and mix it evenly;

[0055] 3) During electroslag remelting, ensure all process parameters, control the current to be stable in the normal stage, control the surface quality and melting rate, ensure the surface and internal quality of the electroslag ingot is good, and after the arcing of the electroslag furnace is completed, add the electroslag remelting slag system into the electroslag furnace crystallizer for electroslag smelting. During the electroslag remelting process, argon gas is blown for protection, and the furnace mouth is completely covered. During the remelting process, observe the total inlet water temperature, and control the outlet water temperature to 45-50℃.

[0056] After the electroslag remelting is completed, the Al content of the electroslag ingot tail and the electroslag ingot riser is detected. It can be seen that the Al content of the electroslag ingot tail is 0.050%, and the Al content of the electroslag ingot riser is 0.048%.

[0057] After the electroslag remelting is completed, the mirror mold steel sample is polished and inspected. The polishing brightness is 12000-14000. There are tiny pits on the surface after polishing. The polishing rate is 95%. It is rated as an excellent product and is suitable for black electronic / cosmetic / high-gloss transparent parts, etc.

[0058] Example 2

[0059] The component contents of the electroslag remelting slag system used in the electroslag remelting process of mirror mold steel in Example 2 of the present invention are controlled as follows in mass percentage: CaF2: 63.50%, BaF2: 3.50%, MgF2: 3.40%, CaO: 9.20%, MgO: 2.50%, Al2O3: 9.50%, SiO2: 6.10%, Li2O: 2.30%, the total content of CaF2+MgF2+BaF2 is controlled as 70.40% in mass percentage, and (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled as 1.18.

[0060] The basic physical properties of the electroslag remelting slag system are as follows: melting point 1250-1280°C, electrical conductivity 1.5-3.1 S / cm, and viscosity 0.15-0.35 Pa·s at 1500°C.

[0061] The method for using the electroslag remelting slag system for the electroslag remelting process of mirror mold steel according to embodiment 2 of the present invention comprises:

[0062] (I) Preparation of electroslag remelting slag system

[0063] The electroslag remelting slag is pre-melted according to the composition content ratio of the electroslag remelting slag system, and then cooled to 25-100° C., crushed by a crusher, and vacuum-sealed for standby use. The content of the electroslag remelting slag in the electroslag remelting slag system is controlled as follows by mass percentage: CaF2: 63.50%, BaF2: 3.50%, MgF2: 3.40%, CaO: 9.20%, MgO: 2.50%, Al2O3: 9.50%, SiO2: 6.10%, Li2O: 2.30%, the total content of CaF2+MgF2+BaF2 is controlled as 70.40% by mass percentage, and (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled as 1.18.

[0064] (II) Electroslag remelting of mirror mold steel

[0065] The prepared electroslag remelting slag system is applied to the smelting of mirror mold steel. The components of the target product of mirror plastic mold steel are as follows: C: 0.38%, Si: 0.37%, Mn: 0.42%, P: 0.017%, S: 0.002%, Cr: 13.5%, Ni: 0.15%, Al: 0.025%, N: 0.022% by mass percentage. The smelting process of the mirror mold steel is carried out in an electroslag furnace and includes:

[0066] 1) Before electroslag remelting, the surface of the consumable electrode of the electroslag furnace must be carefully cleaned to ensure that there is no water seepage or leakage in the crystallizer and bottom water tank, and the condensed water on the inner wall of the crystallizer must be dried;

[0067] 2) Bake the electroslag remelting slag at 750℃ for more than 12h, fully dry it, pour it into the slag mixing hopper, and stir and mix it evenly;

[0068] 3) During electroslag remelting, ensure all process parameters, control the current to be stable in the normal stage, control the surface quality and melting rate, ensure the surface and internal quality of the electroslag ingot is good, and after the arcing of the electroslag furnace is completed, add the electroslag remelting slag system into the electroslag furnace crystallizer for electroslag smelting. During the electroslag remelting process, argon gas is blown for protection, and the furnace mouth is completely covered. During the remelting process, observe the total inlet water temperature, and control the outlet water temperature to 45-50℃.

[0069] After the electroslag remelting is completed, the Al content of the electroslag ingot tail and the electroslag ingot riser is detected. It can be seen that the Al content of the electroslag ingot tail is 0.021%, and the Al content of the electroslag ingot riser is 0.019%.

[0070] After the electroslag remelting is completed, the mirror mold steel sample is polished and inspected. The polishing brightness is 12000-14000. There are tiny pits on the surface after polishing. The polishing rate is 92%. It is rated as an excellent product and is suitable for black electronic / cosmetic / high-gloss transparent parts, etc.

[0071] Example 3

[0072] The component contents of the electroslag remelting slag system used for the electroslag remelting process of mirror mold steel in Example 3 of the present invention are controlled as follows in mass percentage: CaF2: 65.50%, BaF2: 2.30%, MgF2: 2.20%, CaO: 9.80%, MgO: 2.10%, Al2O3: 10.30%, SiO2: 5.70%, Li2O: 2.10%, the total content of CaF2+MgF2+BaF2 is controlled as 70.00% in mass percentage, and (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled as 1.19.

[0073] The basic physical properties of the electroslag remelting slag system are as follows: melting point 1250-1280°C, electrical conductivity 1.5-3.1 S / cm, and viscosity 0.15-0.35 Pa·s at 1500°C.

[0074] The method for using the electroslag remelting slag system for the electroslag remelting process of mirror mold steel according to embodiment 3 of the present invention comprises:

[0075] (I) Preparation of electroslag remelting slag system

[0076] The electroslag remelting slag is pre-melted according to the composition content ratio of the electroslag remelting slag system, and then cooled to 25-100° C., crushed by a crusher, and vacuum-sealed for standby use. Among them, the content of the electroslag remelting slag in the electroslag remelting slag system is controlled as follows by mass percentage: CaF2: 65.50%, BaF2: 2.30%, MgF2: 2.20%, CaO: 9.80%, MgO: 2.10%, Al2O3: 10.30%, SiO2: 5.70%, Li2O: 2.10%, the total content of CaF2+MgF2+BaF2 is controlled as 70.00% by mass percentage, and (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled as 1.19.

[0077] (II) Electroslag remelting of mirror mold steel

[0078] The prepared electroslag remelting slag system is applied to the smelting of mirror mold steel. The components of the target product of mirror plastic mold steel are as follows: C: 0.32%, Si: 0.35%, Mn: 0.33%, P: 0.011%, S: 0.001%, Cr: 7.92%, Ni: 0.11%, Al: 0.042%, N: 0.023% by mass percentage. The smelting process of the mirror mold steel is carried out in an electroslag furnace and includes:

[0079] 1) Before electroslag remelting, the surface of the consumable electrode of the electroslag furnace must be carefully cleaned to ensure that there is no water seepage or leakage in the crystallizer and bottom water tank, and the condensed water on the inner wall of the crystallizer must be dried;

[0080] 2) Bake the electroslag remelting slag at 750℃ for more than 12h, fully dry it, pour it into the slag mixing hopper, and stir and mix it evenly;

[0081] 3) During electroslag remelting, ensure all process parameters, control the current to be stable in the normal stage, control the surface quality and melting rate, ensure the surface and internal quality of the electroslag ingot is good, and after the arcing of the electroslag furnace is completed, add the electroslag remelting slag system into the electroslag furnace crystallizer for electroslag smelting. During the electroslag remelting process, argon gas is blown for protection, and the furnace mouth is completely covered. During the remelting process, observe the total inlet water temperature, and control the outlet water temperature to 45-50℃.

[0082] After the electroslag remelting is completed, the Al content of the electroslag ingot tail and the electroslag ingot riser is detected. It can be seen that the Al content of the electroslag ingot tail is 0.041%, and the Al content of the electroslag ingot riser is 0.038%.

[0083] After the electroslag remelting is completed, the mirror mold steel samples are polished and inspected. The polishing brightness is 12000-14000. There are tiny pits on the surface after polishing. The polishing rate is 91%. It is rated as an excellent product and is suitable for black electronic / cosmetic / high-gloss transparent parts, etc.

[0084] The electroslag remelting slag systems of the above three embodiments of the present invention are compared with the conventional 6-2-2 electroslag remelting slag system as comparative example 1 and the conventional 7-3 electroslag remelting slag system as comparative example 2. The polishing test results of the mirror mold steel samples obtained after electroslag remelting of the mirror mold steel using the electroslag remelting slag systems of embodiments 1, 2, 3 and comparative examples 1 and 2 are shown in Table 1.

[0085] Table 1 Polishing test results of mirror die steel samples

[0086]

[0087] It can be seen that the polishing rate of the mirror mold steel obtained by electroslag remelting of mirror mold steel using the electroslag remelting slag system of the present invention is at least above 91%, and the product grade reaches the excellent grade, while the polishing rate of the mirror mold steel obtained by electroslag remelting of mirror mold steel using conventional 6-2-2 and 7-3 electroslag remelting slag systems is at most 90% or even lower than 90%.

[0088] In addition, the electroslag remelting slag systems of the above three embodiments of the present invention were compared with the conventional 6-2-2 electroslag remelting slag system as comparative example 1 and the conventional 7-3 electroslag remelting slag system as comparative example 2. The Al content of the electroslag ingots obtained after electroslag remelting of mirror mold steel using the electroslag remelting slag systems of embodiments 1, 2, 3 and comparative examples 1 and 2 was tested as shown in Table 2.

[0089] Table 2 Test results of Al content in electroslag ingot

[0090]

[0091] Among them, Al content distribution deviation = (Al content of electroslag ingot tail - Al content of electroslag ingot riser) / Al content of target product.

[0092] It can be seen that the content of aluminum in the mirror mold steel obtained by electroslag remelting of mirror mold steel using the electroslag remelting slag system of the present invention is more evenly distributed.

[0093] Therefore, compared with the prior art, the electric slag remelting slag system used for the electric slag remelting process of mirror mold steel of the present invention has the following advantages and beneficial effects: the electric slag remelting slag system of the present invention is applied to the electric slag remelting of mirror mold steel, which can effectively reduce the brittle inclusions in the mold steel, promote the uniform distribution of the aluminum content in the mold steel, and fully meet the end users' requirements for the polishing performance of mirror mold steel.

[0094] It should be noted that, in this article, the term "comprise" or any other variation thereof is intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such article or device.

[0095] It should also be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the present invention.

Claims

1. An electroslag remelting slag system for mirror mold steel electroslag remelting process, characterized in that: The electroslag remelting slag system comprises electroslag remelting slag materials of CaF2, BaF2, MgF2, CaO, MgO, Al2O3, SiO2 and Li2O, and the electroslag remelting slag system is prepared by pre-melting electroslag remelting slag materials of CaF2, BaF2, MgF2, CaO, MgO, Al2O3, SiO2 and Li2O, cooling to 25-100° C. and crushing with a crusher, and the component contents of each electroslag remelting slag material are as follows by mass percentage: CaF2: 60%-66%, BaF2: 2%-6%, MgF2: 2%-6%, CaO: 8%-14%, MgO: 2% ~ 6%, Al2O3: 8% ~ 12%, SiO2: 4% ~ 8%, Li2O: 2% ~ 6%, and the rest are inevitable impurity residues, wherein the total content of CaF2 + MgF2 + BaF2 is controlled to be ≥ 70% by mass percentage, and the basicity (CaO + MgO + 0.5Li2O) / (SiO2 + 0.5Al2O3) is controlled between 0.85 and 1.2; the melting point of the electroslag remelting slag system is 1250 ~ 1280 ° C, the electrical conductivity is 1.5 ~ 3.1S / cm, and the viscosity at 1500 ° C is 0.15 ~ 0.35Pa s.

2. The electroslag remelting slag system for the electroslag remelting process of mirror mold steel according to claim 1, characterized in that: The component content of each electroslag remelting slag material in the electroslag remelting slag system is controlled as follows by mass percentage: CaF2: 60.50%, BaF2: 4.80%, MgF2: 4.80%, CaO: 8.50%, MgO: 3.40%, Al2O3: 9.00%, SiO2: 6.70%, Li2O: 2.30%, the total content of CaF2+MgF2+BaF2 is controlled to be 70.10%, and the basicity (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled to be 1.

17.

3. The electroslag remelting slag system for the electroslag remelting process of mirror mold steel according to claim 1, characterized in that: The component contents of each electroslag remelting slag material in the electroslag remelting slag system are controlled in mass percentage as follows: CaF2: 63.50%, BaF2: 3.50%, MgF2: 3.40%, CaO: 9.20%, MgO: 2.50%, Al2O3: 9.50%, SiO2: 6.10%, Li2O: 2.30%, the total content of CaF2+MgF2+BaF2 is controlled to be 70.40%, and the basicity (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled to be 1.

18.

4. The electroslag remelting slag system for the electroslag remelting process of mirror mold steel according to claim 1, characterized in that: The component content of each electroslag remelting slag material in the electroslag remelting slag system is controlled in mass percentage as follows: CaF2: 65.50%, BaF2: 2.30%, MgF2: 2.20%, CaO: 9.80%, MgO: 2.10%, Al2O3: 10.30%, SiO2: 5.70%, Li2O: 2.10%, the total content of CaF2+MgF2+BaF2 is controlled to be 70.00%, and the basicity (CaO+MgO+0.5Li2O) / (SiO2+0.5Al2O3) is controlled to be 1.19.

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