CN114635042A - High-sulfur steel electroslag remelting slag and application - Google Patents
High-sulfur steel electroslag remelting slag and application Download PDFInfo
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- CN114635042A CN114635042A CN202210289764.1A CN202210289764A CN114635042A CN 114635042 A CN114635042 A CN 114635042A CN 202210289764 A CN202210289764 A CN 202210289764A CN 114635042 A CN114635042 A CN 114635042A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
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Abstract
The invention belongs to the technical field of engineering, and discloses high-sulfur steel electroslag remelting slag which comprises the following substances in percentage by weight: 55-60% of fluorite, 25-30% of aluminum sesquioxide powder, 5-10% of magnesia and 5-10% of silica. The high-sulfur steel electroslag remelting slag can be applied to electroslag remelting production of high-sulfur steel. The high-sulfur steel electroslag remelting slag contains CaF2、Al2O3、MgO、SiO2The quaternary slag system has lower conductivity, lower melting point of slag and stable components. The electroslag ingot produced by adopting the slag system has smooth surface and high sulfur yield, can avoid the problem that sulfur components are unqualified after sulfur-containing steel is electroslag remelted, and has high purity and good surface and internal quality.
Description
Technical Field
The invention belongs to the technical field of engineering, and particularly relates to high-sulfur steel electroslag remelting slag and application thereof.
Background
Electroslag remelting is a process of melting, refining and solidifying and forming a metal consumable electrode in a crystallizer by using resistance heat generated by liquid slag. The consumable electrode inserted into the liquid slag forms metal molten drops under the high-temperature action of the slag bath, the metal molten drops and the slag are subjected to a series of physical and chemical reactions in the forming and dropping processes, so that harmful impurity elements and non-metal inclusions in the metal are removed, the slag purifies, deoxidizes and removes S and prevents elements from being oxidized and burned in the electroslag remelting process, and the steel remelted by the electroslag has the characteristics of high purity, uniform chemical components, low content of impurity elements such as sulfur, phosphorus and the like, compact solidification structure, uniform metallographic structure, excellent steel ingot surface quality and the like.
At present, binary electroslag remelting slag (70 percent CaF) commonly adopted by electroslag remelting2+30％Al2O3) The method has high alkalinity and strong desulfurization capacity, most of sulfur in the sulfur-containing steel electrode blank is removed in the electroslag remelting process, so that the electroslag ingot has low sulfur content and unqualified components. In addition, quaternary slag systems (CaF) are frequently used2、Al2O3CaO, MgO), for example, CN102407321A discloses an electroslag remelting slag and a manufacturing method thereof, the remelting slag having the following components: CaO 30-35%, Al2O3 30％～35％，CaF228 to 38 percent of the slag system, and 0.1 to 5 percent of MgO, wherein the slag system is stable in the using process, the remelting chemical composition is stable, and the surface of the cast ingot is smooth. CN102994768A discloses electroslag remelting slag, which comprises, by weight, 20-25% of fluorite, 35-40% of bauxite, 30-35% of high-calcium lime, 3-8% of fused magnesia and 5-10% of silica, and the electroslag remelting slag can reduce the introduction of hydrogen, oxygen and nitrogen and has a smooth ingot surface. However, the inventors have found thatThe adopted slag system is easy to cause serious S burning loss and is not beneficial to controlling electroslag components.
Disclosure of Invention
The invention aims to solve the problem of low sulfur yield in the sulfur-containing steel electroslag remelting process, and provides high-sulfur steel electroslag remelting slag and application thereof.
In order to achieve the above object, one aspect of the present invention relates to a high sulfur steel electroslag remelting slag.
The high-sulfur steel electroslag remelting slag comprises the following substances in percentage by weight: 55-60% of fluorite, 25-30% of aluminum sesquioxide powder, 5-10% of magnesia and 5-10% of silica.
Further, each substance needs to satisfy the following requirements:
fluorite: CaF2The content is more than or equal to 98.0 percent and SiO2Less than or equal to 1.5 percent, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of P, and 5-20 mm of granularity;
aluminum sesquioxide powder: al (Al)2O3≥98.0％、SiO2＜0.5％、P＜0.05％、S≤0.05％、H2O is less than or equal to 0.30 percent, the granularity is less than 1mm, and the mixture is baked for more than 4 hours at the temperature of 300-500 ℃ for use;
magnesia: MgO is more than or equal to 97.0 percent, H2O is less than or equal to 0.30 percent, and the granularity is less than or equal to 0.08 mm;
silica: SiO 22＞96％、Al2O3＜0.5％、CaO＜0.45％、MgO＜0.2％、H2O is less than or equal to 0.30 percent, and the granularity is 80 meshes.
The invention also relates to a preparation method of the high-sulfur steel electroslag remelting slag, which comprises the following steps:
1) preparing materials: before slagging, preparing slag charge according to composition requirements;
2) preparing: after an arc striking agent is placed on the bottom pad, the crystallizer is seated, and then the electrode falls down to keep good contact between the electrode and the arc striking agent;
3) adding slag charge: adding slag materials in sequence of fluorite → alumina powder → magnesia → silica;
4) and (4) feeding electricity, arcing and slagging.
Preferably, in the step 4), the current and voltage requirements during slagging and power supplying are as follows: the current is 4000 plus or minus 50A, the voltage is 50 plus or minus 50V, and the time is 20-30 minutes.
The invention also relates to application of the high-sulfur steel electroslag remelting slag.
The high-sulfur steel electroslag remelting slag is used for electroslag remelting production of high-sulfur steel.
Compared with the prior art, the invention has the following beneficial effects: the invention relates to high-sulfur steel electroslag remelting slag prepared from CaF2、Al2O3、MgO、SiO2The quaternary slag system has the advantages of low conductivity, low melting point of slag, stable components and the like through specific component proportion. The electroslag ingot produced by adopting the slag system has smooth surface and high sulfur yield, can avoid the problem of unqualified sulfur components after electroslag remelting of sulfur-containing steel, and has high purity and good surface and internal quality.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
Example 1
The high-sulfur steel electroslag remelting slag comprises the substances with the weight percentage shown in the table 1.
TABLE 1 slag System Components
| CaF2 | Al2O3 | MgO | SiO2 |
| 58％ | 29％ | 7％ | 6％ |
Each substance needs to meet the following requirements:
fluorite: CaF2The content is more than or equal to 98.0 percent and SiO2Less than or equal to 1.5 percent, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of P, and 5-20 mm of granularity;
aluminum sesquioxide powder: al (Al)2O3≥98.0％、SiO2＜0.5％、P＜0.05％、S≤0.05％、H2O is less than or equal to 0.30 percent, the granularity is less than 1mm, and the mixture is baked for more than 4 hours at the temperature of 300-500 ℃ for use;
magnesia: MgO is more than or equal to 97.0 percent, H2O is less than or equal to 0.30 percent, and the granularity is less than or equal to 0.08 mm;
silica: SiO 22＞96％、Al2O3＜0.5％、CaO＜0.45％、MgO＜0.2％、H2O is less than or equal to 0.30 percent, and the granularity is 80 meshes.
Electroslag remelting of 15Mn2SiVS steel is carried out by adopting a slag system shown in Table 1, and the production process of a consumable electrode used for remelting comprises the steps of casting 1090kg of electrode blank in a 1000kg induction furnace and electroslag remelting of an electroslag ingot with the phi 470 mm.
The preparation method of the high-sulfur steel electroslag remelting slag comprises the following steps:
1) preparing materials: before slagging, preparing slag charge according to composition requirements;
2) preparing: after an arc striking agent is placed on the bottom pad, the crystallizer is seated, and then the electrode falls down to keep good contact between the electrode and the arc striking agent;
3) adding slag charge: adding slag materials in sequence of fluorite → aluminum sesquioxide powder → magnesia → silica, wherein the slag materials are added uniformly;
4) the method comprises the following steps of (1) carrying out power supply arcing and slagging, wherein the current and voltage requirements during slagging and power supply are as follows: the current is 4000 plus or minus 50A, the voltage is 50 plus or minus 50V, and the time is 20 to 30 minutes.
The sulfur content before and after the test was varied as shown in Table 2.
TABLE 2 variation of sulfur content
| Element(s) | Electrode blank | Electroslag ingot | Yield of the product |
| S | 0.075％ | 0.047％ | 62.7％ |
The detection conditions of the electroslag ingot inclusions are tested and shown in table 3.
TABLE 3 variation of sulfur content
| Coarse A | A is thin | B coarse | B is thin | Coarse fraction of C | Fine diameter of C | D coarse | D is thin |
| 0 | 2.0 | 0 | 1.5 | 0 | 0 | 0 | 0 |
In addition, according to the characteristics of components in the slag, fluoride can improve the electrical conductivity of the slag, and oxide can reduce the electrical conductivity of the slag, so that the invention adds SiO with certain content in the slag2The electrical conductivity of the slag can be obviously reduced; adding a certain content of SiO into the molten slag2The phases with low melting point and simple structure in the slag are increased, so that the fluidity of the slag is obviously improved, and the melting point of the slag is reduced. Therefore, the slag system of the invention also has lower electrical conductivity and lower melting point.
Example 2
The high-sulfur steel electroslag remelting slag comprises substances with the weight percentage shown in table 4.
TABLE 4 slag system components
| CaF2 | Al2O3 | MgO | SiO2 |
| 57％ | 28％ | 7％ | 8％ |
Each substance needs to meet the following requirements:
fluorite: CaF2The content is more than or equal to 98.0 percent and SiO2Less than or equal to 1.5 percent, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of P, and 5-20 mm of granularity;
aluminum sesquioxide powder: al (Al)2O3≥98.0％、SiO2＜0.5％、P＜0.05％、S≤0.05％、H2O is less than or equal to 0.30 percent, the granularity is less than 1mm, and the mixture is baked for more than 4 hours at the temperature of 300-500 ℃ for use;
magnesia: MgO is more than or equal to 97.0 percent, H2O is less than or equal to 0.30 percent, and the granularity is less than or equal to 0.08 mm;
silica: SiO 22＞96％、Al2O3＜0.5％、CaO＜0.45％、MgO＜0.2％、H2O is less than or equal to 0.30 percent, and the granularity is 80 meshes.
Electroslag remelting of 15Mn2SiVS steel is carried out by adopting a slag system shown in Table 1, and the production process of a consumable electrode used for remelting comprises the steps of casting 1090kg of electrode blank in a 1000kg induction furnace and electroslag remelting of an electroslag ingot with the phi 470 mm.
The preparation method of the high-sulfur steel electroslag remelting slag comprises the following steps:
1) preparing materials: before slagging, preparing slag charge according to composition requirements;
2) preparing: after an arc striking agent is placed on the bottom pad, the crystallizer is seated, and then the electrode falls down to keep good contact between the electrode and the arc striking agent;
3) adding slag charge: adding slag materials in sequence of fluorite → aluminum sesquioxide powder → magnesia → silica, wherein the slag materials are added uniformly;
4) the method comprises the following steps of (1) carrying out power supply arcing and slagging, wherein the current and voltage requirements during slagging and power supply are as follows: the current is 4000 plus or minus 50A, the voltage is 50 plus or minus 50V, and the time is 20 to 30 minutes.
The sulfur content before and after the test was varied, as shown in Table 5.
TABLE 5 variation of sulfur content
| Element(s) | Electrode blank | Electroslag ingot | Yield of the product |
| S | 0.071％ | 0.048％ | 67.60％ |
The detection conditions of the electroslag ingot inclusions are tested and shown in Table 6.
TABLE 6 variation of sulfur content
| Coarse A | A is thin | B coarse | B is thin | Coarse fraction of C | Fine diameter of C | D coarse | D is thin |
| 0 | 2.0 | 0 | 1.0 | 0 | 0 | 0 | 0 |
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (5)
1. The high-sulfur steel electroslag remelting slag is characterized by comprising the following substances in percentage by weight: 55-60% of fluorite, 25-30% of aluminum sesquioxide powder, 5-10% of magnesia and 5-10% of silica.
2. The high-sulfur steel electroslag remelting slag according to claim 1, wherein the substances are required to meet the following requirements:
fluorite: CaF2The content is more than or equal to 98.0 percent and SiO2Less than or equal to 1.5 percent, less than or equal to 0.05 percent of S, less than or equal to 0.03 percent of P, and 5-20 mm of granularity;
aluminum sesquioxide powder: al (Al)2O3≥98.0％、SiO2＜0.5％、P＜0.05％、S≤0.05％、H2O is less than or equal to 0.30 percent, the granularity is less than 1mm, and the mixture is baked for more than 4 hours at the temperature of 300-500 ℃ for use;
magnesia: MgO is more than or equal to 97.0 percent, H2O is less than or equal to 0.30 percent, and the granularity is less than or equal to 0.08 mm;
silica: SiO 22＞96％、Al2O3＜0.5％、CaO＜0.45％、MgO＜0.2％、H2O is less than or equal to 0.30 percent, and the granularity is 80 meshes.
3. The high-sulfur steel electroslag remelting slag according to claim 1, wherein the preparation method of the high-sulfur steel electroslag remelting slag comprises the following steps:
1) preparing materials: before slagging, preparing slag charge according to composition requirements;
2) preparing: after an arc striking agent is placed on the bottom pad, the crystallizer is seated, and then the electrode falls down to keep good contact between the electrode and the arc striking agent;
3) adding slag charge: adding slag materials in sequence of fluorite → alumina powder → magnesia → silica;
4) and (4) feeding electricity, arcing and slagging.
4. The high-sulfur steel electroslag remelting slag according to claim 3, wherein in the step 4), the current and voltage requirements during slagging and power supplying are as follows: the current is 4000 plus or minus 50A, the voltage is 50 plus or minus 50V, and the time is 20 to 30 minutes.
5. The high-sulfur steel electroslag remelting slag according to any one of claims 1 to 3 is applied to electroslag remelting production of high-sulfur steel.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605190A (en) * | 2012-04-10 | 2012-07-25 | 山东远大模具材料有限公司 | Mold steel electroslag re-melting slag system and use method of mold steel electroslag re-melting slag system |
| CN105803217A (en) * | 2016-04-22 | 2016-07-27 | 重庆钢铁(集团)有限责任公司 | Method for ensuring high sulfur yield and uniform distribution of sulfur content during electroslag remelting process of sulfur-bearing steel |
| CN105950880A (en) * | 2016-05-27 | 2016-09-21 | 中原特钢股份有限公司 | Sulfur bearing steel electro-slag remelting process |
| CN109055770A (en) * | 2018-09-30 | 2018-12-21 | 重庆钢铁(集团)有限责任公司 | A kind of electroslag remelting slag and it is used for electroslag remelting 40CrNiMoA low hydrogen control method |
| CN110358930A (en) * | 2019-08-13 | 2019-10-22 | 哈尔滨威尔焊接有限责任公司 | A kind of method of the electro slag remelting slag that sulphur can be protected and electroslag remelting |
| CN112226625A (en) * | 2020-09-30 | 2021-01-15 | 大冶特殊钢有限公司 | Quaternary slag system for electroslag remelting steel production and application thereof |
-
2022
- 2022-03-23 CN CN202210289764.1A patent/CN114635042A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605190A (en) * | 2012-04-10 | 2012-07-25 | 山东远大模具材料有限公司 | Mold steel electroslag re-melting slag system and use method of mold steel electroslag re-melting slag system |
| CN105803217A (en) * | 2016-04-22 | 2016-07-27 | 重庆钢铁(集团)有限责任公司 | Method for ensuring high sulfur yield and uniform distribution of sulfur content during electroslag remelting process of sulfur-bearing steel |
| CN105950880A (en) * | 2016-05-27 | 2016-09-21 | 中原特钢股份有限公司 | Sulfur bearing steel electro-slag remelting process |
| CN109055770A (en) * | 2018-09-30 | 2018-12-21 | 重庆钢铁(集团)有限责任公司 | A kind of electroslag remelting slag and it is used for electroslag remelting 40CrNiMoA low hydrogen control method |
| CN110358930A (en) * | 2019-08-13 | 2019-10-22 | 哈尔滨威尔焊接有限责任公司 | A kind of method of the electro slag remelting slag that sulphur can be protected and electroslag remelting |
| CN112226625A (en) * | 2020-09-30 | 2021-01-15 | 大冶特殊钢有限公司 | Quaternary slag system for electroslag remelting steel production and application thereof |
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