CN115852155A - Electroslag remelting slag system for mirror surface die steel electroslag remelting process - Google Patents
Electroslag remelting slag system for mirror surface die steel electroslag remelting process Download PDFInfo
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Abstract
The invention discloses an electroslag remelting slag system for an electroslag remelting process of mirror surface die steel, wherein an electroslag remelting slag contained in the electroslag remelting slag system is CaF 2 、BaF 2 、MgF 2 、CaO、MgO、Al 2 O 3 、SiO 2 、Li 2 And O, the component contents of each electroslag remelting slag are as follows by mass percent: caF 2 ：60％～66％、BaF 2 ：2％～6％、MgF 2 ：2％～6％、CaO：8％～14％、MgO：2％～6％、Al 2 O 3 ：8％～12％、SiO 2 ：4％～8％、Li 2 O:2 to 6 percent, and the balance of inevitable impurities, wherein CaF 2 +MgF 2 +BaF 2 The total content of the lead-free glass powder is controlled to be more than or equal to 70 percent by mass percent, and the alkalinity is (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) The control is between 0.85 and 1.2. The electroslag remelting slag system is applied to the electroslag remelting of mirror surface die steel, and can effectively reduce brittle inclusions in the die steel and promoteThe uniform distribution of the aluminum element content in the die steel completely meets the polishing performance requirements of end users on the mirror surface die steel.
Description
Technical Field
The invention belongs to the technical field of mirror surface die steel electroslag remelting, and particularly relates to an electroslag remelting slag system for a mirror surface die steel electroslag remelting process.
Background
The mirror surface die steel is widely applied to household appliance parts, electromechanical industrial parts, rubber products, ceramic products, plastic products and the like. The basic requirements of customers for mirror surface die steel products are less inclusions and high polishing performance.
Electroslag remelting is an important link in the manufacturing process of mirror surface die steel, and is a method for smelting by using resistance heat generated when current passes through slag as a heat source. In the electroslag remelting process, electroslag remelting slag is deeply contacted with metal droplets, and a chemical reaction occurs. Therefore, the quality of the final product of the mirror surface die steel is closely related to the electroslag remelting slag.
The conventional electroslag remelting slag system used for the electroslag remelting process of mirror surface die steel at present comprises a 7-3 slag system and a 6-2-2 slag system, wherein CaF in the 7-3 slag system 2 And Al 2 O 3 The ratio of (1) to (2) is 7 2 O 3 The content is high, and the capacity of removing oxide inclusions is relatively poor; in 6-2-2 slag system, caF 2 CaO and Al 2 O 3 The ratio of (6). In addition, the conventional slag system of 7-3 and slag system of 6-2-2 are adopted to carry out the electroslag remelting process of the mirror surface die steel, and the electroslag remelting process of the mirror surface die steel also existsThe problem of non-uniform aluminum content.
Disclosure of Invention
In order to solve the problems, the invention provides an electroslag remelting slag system for an electroslag remelting process of mirror surface die steel, wherein an electroslag remelting slag contained in the electroslag remelting slag system is CaF 2 、BaF 2 、MgF 2 、CaO、MgO、Al 2 O 3 、SiO 2 、Li 2 And O, the component contents of each electroslag remelting slag are as follows by mass percent: caF 2 ：60％～66％、BaF 2 ：2％～6％、MgF 2 ：2％～6％、CaO：8％～14％、MgO：2％～6％、Al 2 O 3 ：8％～12％、SiO 2 ：4％～8％、Li 2 O:2 to 6 percent, and the balance of inevitable impurities, wherein CaF 2 +MgF 2 +BaF 2 The total content of the lead-free acid is controlled to be more than or equal to 70 percent by mass percent, and the alkalinity is (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) The control is between 0.85 and 1.2.
Further, in the electroslag remelting slag system for the mirror surface die steel electroslag remelting process, the electroslag remelting slag system is formed by remelting electroslag remelting slag CaF 2 、BaF 2 、MgF 2 、CaO、MgO、Al 2 O 3 、SiO 2 、Li 2 O is pre-melted, cooled to 25-100 ℃ and crushed by a crusher.
Furthermore, in the electroslag remelting slag system for the electroslag remelting process of the mirror surface die steel, the melting point of the electroslag remelting slag system is 1250-1280 ℃, the conductivity is 1.5-3.1S/cm, and the viscosity at 1500 ℃ is 0.15-0.35 Pa.s.
Further, in the electroslag remelting slag system for the mirror surface die steel electroslag remelting process, the component content of each electroslag remelting slag in the electroslag remelting slag system is controlled by the following components in percentage by mass: caF 2 ：60.50％、BaF 2 ：4.80％、MgF 2 ：4.80％、CaO：8.50％、MgO：3.40％、Al 2 O 3 ：9.00％、SiO 2 ：6.70％、Li 2 O：2.30％，CaF 2 +MgF 2 +BaF 2 The total content of (C) is controlled to 70.10%, and the alkalinity is (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.17.
Further, in the electroslag remelting slag system for the mirror surface die steel electroslag remelting process, the component content of each electroslag remelting slag in the electroslag remelting slag system is controlled by the following components in percentage by mass: caF 2 ：63.50％、BaF 2 ：3.50％、MgF 2 ：3.40％、CaO：9.20％、MgO：2.50％、Al 2 O 3 ：9.50％、SiO 2 ：6.10％、Li 2 O：2.30％，CaF 2 +MgF 2 +BaF 2 The total content of (C) is controlled to 70.40%, and the alkalinity is (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.18.
Further, in the electroslag remelting slag system for the mirror surface die steel electroslag remelting process, the component content of each electroslag remelting slag in the electroslag remelting slag system is controlled by the following components in percentage by mass: caF 2 ：65.50％、BaF 2 ：2.30％、MgF 2 ：2.20％、CaO：9.80％、MgO：2.10％、Al 2 O 3 ：10.30％、SiO 2 ：5.70％、Li 2 O：2.10％，CaF 2 +MgF 2 +BaF 2 The total content of (C) is controlled to 70.00%, and the alkalinity is (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.19.
The electroslag remelting slag system for the mirror surface die steel electroslag remelting process has the following advantages and beneficial effects: the electroslag remelting slag system is applied to the electroslag remelting of mirror surface die steel, can effectively reduce brittle inclusions in the die steel, promotes the uniform distribution of the aluminum element content in the die steel, and completely meets the polishing performance requirements of end users on the mirror surface die steel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The electroslag remelting slag system for the mirror surface die steel electroslag remelting process comprises the following components in percentage by mass: caF 2 ：60％～66％、BaF 2 ：2％～6％、MgF 2 ：2％～6％、CaO：8％～14％、MgO：2％～6％、Al 2 O 3 ：8％～12％、SiO 2 ：4％～8％、Li 2 O:2 to 6 percent, and the balance of inevitable impurities, wherein the low-melting-point system component CaF 2 +MgF 2 +BaF 2 The total content of the catalyst is controlled to be more than or equal to 70 percent according to the mass percentage, and the alkalinity R = (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) The control is between 0.85 and 1.2.
The basic physical properties of the electroslag remelting slag system for the mirror surface die steel electroslag remelting process are as follows: the melting point is 1250-1280 ℃, the conductivity is 1.5-3.1S/cm, and the viscosity at 1500 ℃ is 0.15-0.35 Pa.s.
The use method of the electroslag remelting slag system for the mirror surface die steel electroslag remelting process comprises the following steps:
preparation of electroslag remelting slag system
Proportioning the electroslag remelting slag CaF according to the component content of the electroslag remelting slag system 2 、BaF 2 、MgF 2 、CaO、MgO、Al 2 O 3 、SiO 2 、Li 2 Pre-melting the electroslag remelting slag, cooling to 25-100 ℃, crushing by a crusher, and sealing in vacuum for later use, wherein the content of the electroslag remelting slag in the electroslag remelting slag system is controlled as follows by mass percent: caF 2 ：60％～66％、BaF 2 ：2％～6％、MgF 2 ：2％～6％、CaO：8％～14％、MgO：2％～6％、Al 2 O 3 ：8％～12％、SiO 2 ：4％～8％、Li 2 O:2 to 6 percent, the balance being inevitable impurities, and,low melting point system component CaF 2 +MgF 2 +BaF 2 The total content of the catalyst is controlled to be more than or equal to 70 percent according to the mass percentage, and the alkalinity R = (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) The control is between 0.85 and 1.2.
Electroslag remelting of mirror surface die steel
The prepared electroslag remelting slag system is applied to smelting mirror surface die steel, and the smelting process is carried out by adopting an electroslag furnace and comprises the following steps:
1) Before electroslag remelting, carefully cleaning the surface of a consumable electrode of an electroslag furnace, ensuring that the crystallizer and a bottom water tank cannot have water seepage and water leakage phenomena, and drying condensed water on the inner wall of the crystallizer;
2) Fully baking and drying the electroslag remelting slag system, pouring the slag system into a slag mixing hopper, and stirring and mixing uniformly;
3) And during electroslag remelting, various process parameters are ensured, the current is controlled to be stable in a normal stage, the surface quality and the melting rate are controlled well, the surface quality and the internal quality of an electroslag ingot are ensured to be good, and after the arc striking of an electroslag furnace is finished, an electroslag remelting slag system is added into an electroslag furnace crystallizer to carry out electroslag smelting.
In the electroslag remelting slag system for the electroslag remelting process of mirror surface die steel, the reason that the content of each component in the electroslag remelting slag system is limited is as follows:
CaF 2 ：60％～66％
CaF 2 because of its low melting point, it is an indispensable component in electroslag remelting slag system. Adding a certain amount of CaF into the composite slag system 2 The liquidus temperature of the heavy slag can be obviously reduced. In order to ensure that the liquidus temperature reaches the target range, a small amount of BaF is proportioned in the electroslag remelting slag system of the invention 2 And MgF 2 。
BaF 2 ：2％～6％
BaF 2 Can stabilize electric arc, make electroslag process stably proceed, and can 2 、MgF 2 Can be used in combination.
MgF 2 ：2％～6％
MgF 2 With CaF 2 、BaF 2 The combined use of the slag and the slag forms the component basis of the electroslag remelting slag with low melting point and low surface tension.
CaO：8％～14％
CaO has a melting point of 2600 deg., and belongs to an extranet oxide. The function in the slag system is to increase the alkalinity of slag and improve the desulfurization efficiency; can obviously reduce the viscosity of slag and absorb oxide inclusions in steel, particularly Al 2 O 3 。
MgO：2％～6％
CaO in the slag system is easy to absorb hydrogen, and MgO is added to form a semi-solidified film on the surface of the slag pool, so that the radiation heat loss of the slag surface to the atmosphere is reduced, and the permeability of hydrogen is reduced. MgO can reduce the viscosity, solidifying point and activation energy of the slag. The addition of MgO can increase the fluidity of the slag while keeping the same viscosity and softening point of the slag, but the addition amount of MgO cannot be too high.
Al 2 O 3 ：8％～12％
The viscosity of the slag can be increased in the slag system, the conductivity of the slag is obviously reduced, the power consumption is reduced, and the productivity is improved. Adding Al to the slag 2 O 3 The viscosity of the slag is increased, but it can lower the solidification point of the slag, thereby improving the crystallizer lubrication.
SiO 2 ：4％～8％
The basis of neutral slag is formed, and the uniform aluminum content in the electroslag remelting steel can be promoted.
Li 2 O：2％～6％
The melting point of the slag system is reduced, the fluxing agent is strong, and the fluidity of the slag is improved. Li 2 O is added to the slag to break the chain structure of the mold flux, to make the slag fluid and to lower the crystallization temperature, but excessive addition increases the crystallization rate of the slag.
(CaF 2 +MgF 2 +BaF 2 )≥70％
The composition basis of the melting point of the slag system is controlled, and the fluidity of the slag system is enhanced.
(CaO+MgO+0.5Li 2 O)/(SiO 2 +0.5Al 2 O 3 )＝0.85～1.2
Neutral slag is formed, and the uniform distribution of the Al content is promoted.
The electroslag remelting slag system for the electroslag remelting process of mirror surface die steel is described in detail below with reference to specific examples.
Example 1
The electroslag remelting slag system used for the mirror surface die steel electroslag remelting process in the embodiment 1 of the invention comprises the following components in percentage by mass: caF 2 ：60.50％、BaF 2 ：4.80％、MgF 2 ：4.80％、CaO：8.50％、MgO：3.40％、Al 2 O 3 ：9.00％、SiO 2 ：6.70％、Li 2 O：2.30％，CaF 2 +MgF 2 +BaF 2 The total content of the components is controlled to be 70.10 percent by mass percent, (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.17.
The basic physical properties of the electroslag remelting slag system are as follows: the melting point is 1250-1280 ℃, the conductivity is 1.5-3.1S/cm, and the viscosity is 0.15-0.35 Pa.s at 1500 ℃.
The use method of the electroslag remelting slag system for the mirror surface die steel electroslag remelting process in the embodiment 1 of the invention comprises the following steps:
preparation of electroslag remelting slag system
Proportioning the electroslag remelting slag CaF according to the component content of the electroslag remelting slag system 2 、BaF 2 、MgF 2 、CaO、MgO、Al 2 O 3 、SiO 2 、Li 2 Pre-melting the electroslag remelting slag, cooling to 25-100 ℃, crushing by a crusher, and sealing in vacuum for later use, wherein the content of the electroslag remelting slag in the electroslag remelting slag system is controlled as follows by mass percent: caF 2 ：60.50％、BaF 2 ：4.80％、MgF 2 ：4.80％、CaO：8.50％、MgO：3.40％、Al 2 O 3 ：9.00％、SiO 2 ：6.70％、Li 2 O：2.30％，CaF 2 +MgF 2 +BaF 2 The total content of the components is controlled to be 70.10 percent by mass percent, (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) The control was 1.17.
(II) electroslag remelting of mirror surface die steel
The prepared electroslag remelting slag system is applied to smelting of mirror surface die steel, and the mirror surface plastic die steel target product comprises the following components in percentage by mass: 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%, the smelting process of the mirror surface die steel is carried out by adopting an electroslag furnace and comprises the following steps:
1) Before electroslag remelting, carefully cleaning the surface of a consumable electrode of an electroslag furnace, ensuring that the crystallizer and a bottom water tank cannot have water seepage and water leakage phenomena, and drying condensed water on the inner wall of the crystallizer;
2) Baking the electroslag remelting slag system at 750 ℃ for more than 12 hours, fully baking and drying, pouring into a slag mixing hopper, and stirring and mixing uniformly;
3) And during electroslag remelting, various process parameters are ensured, the control current is stable in a normal stage, the surface quality and the melting rate are controlled well, the surface quality and the internal quality of an electroslag ingot are ensured to be good, and after the arc striking of an electroslag furnace is finished, electroslag remelting slag is added into an electroslag furnace crystallizer to carry out electroslag smelting. Argon is blown for protection in the electroslag remelting process, and the furnace mouth is completely covered. The total water inlet temperature is observed in the remelting process, and the water outlet temperature is controlled to be 45-50 ℃.
After electroslag remelting is finished, the Al contents of the electroslag ingot tail and the electroslag ingot riser are detected, and the Al content of the electroslag ingot tail is 0.050%, and the Al content of the electroslag ingot riser is 0.048%.
And after electroslag remelting is finished, polishing and inspecting the mirror die steel sample, wherein the polishing brightness is 12000-14000, fine pits are formed on the polished surface, the polishing rate is 95%, and the product is evaluated to be an excellent product and is suitable for black electronic products, cosmetics, high-light transparent parts and the like.
Example 2
The electroslag remelting slag system used for the mirror surface die steel electroslag remelting process in the embodiment 2 of the invention comprises the following components in percentage by mass: caF 2 ：63.50％、BaF 2 ：3.50％、MgF 2 ：3.40％、CaO：9.20％、MgO：2.50％、Al 2 O 3 ：9.50％、SiO 2 ：6.10％、Li 2 O：2.30％，CaF 2 +MgF 2 +BaF 2 The total content of the components is controlled to be 70.40 percent by mass percent, (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.18.
The basic physical properties of the electroslag remelting slag system are as follows: the melting point is 1250-1280 ℃, the conductivity is 1.5-3.1S/cm, and the viscosity is 0.15-0.35 Pa.s at 1500 ℃.
The use method of the electroslag remelting slag system for the mirror surface die steel electroslag remelting process in the embodiment 2 of the invention comprises the following steps:
preparation of electroslag remelting slag system
Proportioning the electroslag remelting slag CaF according to the component content of the electroslag remelting slag system 2 、BaF 2 、MgF 2 、CaO、MgO、Al 2 O 3 、SiO 2 、Li 2 Pre-melting the electroslag remelting slag, cooling to 25-100 ℃, crushing by a crusher, and sealing in vacuum for later use, wherein the content of the electroslag remelting slag in the electroslag remelting slag system is controlled as follows by mass percent: caF 2 ：63.50％、BaF 2 ：3.50％、MgF 2 ：3.40％、CaO：9.20％、MgO：2.50％、Al 2 O 3 ：9.50％、SiO 2 ：6.10％、Li 2 O：2.30％，CaF 2 +MgF 2 +BaF 2 The total content of the components is controlled to be 70.40 percent by mass percent, (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.18.
(II) electroslag remelting of mirror surface die steel
The prepared electroslag remelting slag system is applied to smelting of mirror surface die steel, and the mirror surface plastic die steel target product comprises the following components in percentage by mass: 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%, the smelting process of the mirror surface die steel is carried out by adopting an electroslag furnace and comprises the following steps:
1) Before electroslag remelting, carefully cleaning the surface of a consumable electrode of an electroslag furnace, ensuring that water seepage and water leakage cannot occur in a crystallizer and a bottom water tank, and drying condensed water on the inner wall of the crystallizer;
2) Baking the electroslag remelting slag system at 750 ℃ for more than 12 hours, fully baking and drying, pouring into a slag mixing hopper, and stirring and mixing uniformly;
3) And during electroslag remelting, various process parameters are ensured, the current is controlled to be stable in a normal stage, the surface quality and the melting rate are controlled well, the surface quality and the internal quality of an electroslag ingot are ensured to be good, and after the arc striking of an electroslag furnace is finished, an electroslag remelting slag system is added into an electroslag furnace crystallizer to carry out electroslag smelting. Argon is blown for protection in the electroslag remelting process, and the furnace mouth is completely covered. The total water inlet temperature is observed in the remelting process, and the water outlet temperature is controlled to be 45-50 ℃.
After the electroslag remelting is finished, the Al contents of the electroslag ingot tail and the electroslag ingot riser are detected, and the Al content of the electroslag ingot tail is 0.021%, and the Al content of the electroslag ingot riser is 0.019%.
And after electroslag remelting is finished, polishing and inspecting the mirror surface die steel sample, wherein the polishing brightness is 12000-14000, fine pits exist on the polished surface, the polishing rate is 92%, and the product is evaluated to be an excellent product and is suitable for black electronic/cosmetics/high-light transparent parts and the like.
Example 3
The electroslag remelting slag system used for the mirror surface die steel electroslag remelting process in the embodiment 3 of the invention comprises the following components in percentage by mass: caF 2 ：65.50％、BaF 2 ：2.30％、MgF 2 ：2.20％、CaO：9.80％、MgO：2.10％、Al 2 O 3 ：10.30％、SiO 2 ：5.70％、Li 2 O：2.10％，CaF 2 +MgF 2 +BaF 2 The total content of the components is controlled to be 70.00 percent by mass percent, (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.19.
The basic physical properties of the electroslag remelting slag system are as follows: the melting point is 1250-1280 ℃, the conductivity is 1.5-3.1S/cm, and the viscosity is 0.15-0.35 Pa.s at 1500 ℃.
The use method of the electroslag remelting slag system for the mirror surface die steel electroslag remelting process in the embodiment 3 of the invention comprises the following steps:
preparation of electroslag remelting slag system
Proportioning the electroslag remelting slag CaF according to the component content of the electroslag remelting slag system 2 、BaF 2 、MgF 2 、CaO、MgO、Al 2 O 3 、SiO 2 、Li 2 Pre-melting the electroslag remelting slag, cooling to 25-100 ℃, crushing by a crusher, and sealing in vacuum for later use, wherein the content of the electroslag remelting slag in the electroslag remelting slag system is controlled by the following mass percent: caF 2 ：65.50％、BaF 2 ：2.30％、MgF 2 ：2.20％、CaO：9.80％、MgO：2.10％、Al 2 O 3 ：10.30％、SiO 2 ：5.70％、Li 2 O：2.10％，CaF 2 +MgF 2 +BaF 2 The total content of the components is controlled to be 70.00 percent by mass percent, (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.19.
(II) electroslag remelting of mirror surface die steel
The prepared electroslag remelting slag system is applied to smelting of mirror surface die steel, and the mirror surface plastic die steel target product comprises the following components in percentage by mass: 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 percent, the smelting process of the mirror surface die steel is carried out by adopting an electroslag furnace and comprises the following steps:
1) Before electroslag remelting, carefully cleaning the surface of a consumable electrode of an electroslag furnace, ensuring that the crystallizer and a bottom water tank cannot have water seepage and water leakage phenomena, and drying condensed water on the inner wall of the crystallizer;
2) Baking the electroslag remelting slag system at 750 ℃ for more than 12 hours, fully baking and drying, pouring into a slag mixing hopper, and stirring and mixing uniformly;
3) And during electroslag remelting, various process parameters are ensured, the current is controlled to be stable in a normal stage, the surface quality and the melting rate are controlled well, the surface quality and the internal quality of an electroslag ingot are ensured to be good, and after the arc striking of an electroslag furnace is finished, an electroslag remelting slag system is added into an electroslag furnace crystallizer to carry out electroslag smelting. Argon is blown for protection in the electroslag remelting process, and the furnace mouth is completely covered. The total water inlet temperature is observed in the remelting process, and the water outlet temperature is controlled to be 45-50 ℃.
After electroslag remelting is finished, the Al contents of the electroslag ingot tail and the electroslag ingot riser are detected, and the Al content of the electroslag ingot tail is 0.041%, and the Al content of the electroslag ingot riser is 0.038%.
And after electroslag remelting is finished, polishing and inspecting the mirror die steel sample, wherein the polishing brightness is 12000-14000, fine pits are formed on the polished surface, the polishing rate is 91%, and the product is evaluated to be an excellent product and is suitable for black electronic products, cosmetics, high-light transparent parts and the like.
The results of the polishing tests of the mirror surface mold steel samples obtained by comparing the electroslag remelting slag systems of the above three examples of the present invention 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 and performing the mirror surface mold steel electroslag remelting using the electroslag remelting slag systems of examples 1, 2 and 3 and comparative examples 1 and 2 are shown in table 1.
TABLE 1 mirror surface mold steel sample polishing test results
Therefore, the polishing rate of the mirror surface die steel obtained by performing the electroslag remelting on the mirror surface die steel by using the electroslag remelting slag system is at least over 91 percent, the product grade reaches the Zuoyue grade, and the polishing rate of the mirror surface die steel obtained by performing the electroslag remelting on the mirror surface die steel by using the conventional 6-2-2 and 7-3 electroslag remelting slag systems is up to 90 percent or even lower than 90 percent.
In addition, the Al content of the electroslag ingots obtained by performing the electroslag remelting of the mirror surface mold steel using the electroslag remelting slag systems of examples 1, 2, and 3 and comparative examples 1 and 2 are shown in table 2, by comparing the electroslag remelting slag systems of the above three examples of the present invention 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.
TABLE 2 detection result of Al content in electroslag ingot
Wherein, the Al content distribution deviation = (the Al content of the electroslag ingot tail-the Al content of an electroslag ingot riser)/the Al content of a target product.
Therefore, the distribution of the aluminum element content in the mirror surface die steel obtained by performing the electroslag remelting on the mirror surface die steel by utilizing the electroslag remelting slag system is more uniform.
Therefore, compared with the prior art, the electroslag remelting slag system for the electroslag remelting process of mirror surface die steel has the following advantages and beneficial effects: the electroslag remelting slag system is applied to the electroslag remelting of mirror surface die steel, can effectively reduce brittle inclusions in the die steel, promotes the uniform distribution of the aluminum element content in the die steel, and completely meets the polishing performance requirements of end users on the mirror surface die steel.
It is to be noted that, in this document, the term "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion, so that an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus.
It should be further noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. The electroslag remelting slag system for the mirror surface die steel electroslag remelting process is characterized in that an electroslag remelting slag contained in the electroslag remelting slag system is CaF 2 、BaF 2 、MgF 2 、CaO、MgO、Al 2 O 3 、SiO 2 、Li 2 And O, the component contents of each electroslag remelting slag are as follows by mass percent: caF 2 ：60％～66％、BaF 2 ：2％～6％、MgF 2 ：2％～6％、CaO：8％～14％、MgO：2％～6％、Al 2 O 3 ：8％～12％、SiO 2 ：4％～8％、Li 2 O:2 to 6 percent, and the balance of inevitable impurities, wherein CaF 2 +MgF 2 +BaF 2 The total content of the lead-free acid is controlled to be more than or equal to 70 percent by mass percent, and the alkalinity is (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) The control is between 0.85 and 1.2.
2. The electroslag remelting slag system for mirror surface die steel electroslag remelting process according to claim 1, wherein the electroslag remelting slag system is obtained by remelting electroslag slag CaF 2 、BaF 2 、MgF 2 、CaO、MgO、Al 2 O 3 、SiO 2 、Li 2 O is pre-melted, cooled to 25-100 ℃ and crushed by a crusher.
3. The electroslag remelting slag system for the electroslag remelting process of mirror surface die steel, according to claim 1, wherein the melting point of the electroslag remelting slag system is 1250 to 1280 ℃, the conductivity is 1.5 to 3.1S/cm, and the viscosity at 1500 ℃ is 0.15 to 0.35 Pa-S.
4. The electroslag remelting slag system for the electroslag remelting process of mirror surface die steel according to any one of claims 1 to 3, wherein the composition content of each electroslag remelting slag in the electroslag remelting slag system is controlled by the following components in percentage by mass: caF 2 ：60.50％、BaF 2 ：4.80％、MgF 2 ：4.80％、CaO：8.50％、MgO：3.40％、Al 2 O 3 ：9.00％、SiO 2 ：6.70％、Li 2 O：2.30％，CaF 2 +MgF 2 +BaF 2 The total content of (C) is controlled to 70.10%, and the alkalinity is (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.17.
5. The electroslag remelting slag system for the electroslag remelting process for mirror surface mold steel according to any one of claims 1 to 3, wherein the composition content of each electroslag remelting slag in the electroslag remelting slag system is controlled by the following components in percentage by mass: caF 2 ：63.50％、BaF 2 ：3.50％、MgF 2 ：3.40％、CaO：9.20％、MgO：2.50％、Al 2 O 3 ：9.50％、SiO 2 ：6.10％、Li 2 O：2.30％，CaF 2 +MgF 2 +BaF 2 The total content of (C) is controlled to 70.40%, and the alkalinity is (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.18.
6. The electroslag remelting slag system for the electroslag remelting process of mirror surface die steel according to any one of claims 1 to 3, wherein the composition content of each electroslag remelting slag in the electroslag remelting slag system is controlled by the following components in percentage by mass: caF 2 ：65.50％、BaF 2 ：2.30％、MgF 2 ：2.20％、CaO：9.80％、MgO：2.10％、Al 2 O 3 ：10.30％、SiO 2 ：5.70％、Li 2 O：2.10％，CaF 2 +MgF 2 +BaF 2 The total content of (C) is controlled to 70.00%, and the alkalinity is (CaO + MgO +0.5 Li) 2 O)/(SiO 2 +0.5Al 2 O 3 ) Control was 1.19.
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