CN112921146B - Iron-carbon press ball and using method thereof - Google Patents
Iron-carbon press ball and using method thereof Download PDFInfo
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- CN112921146B CN112921146B CN202110174017.9A CN202110174017A CN112921146B CN 112921146 B CN112921146 B CN 112921146B CN 202110174017 A CN202110174017 A CN 202110174017A CN 112921146 B CN112921146 B CN 112921146B
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- iron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to an iron-carbon press ball, a using method thereof and iron-carbon pressThe ball comprises the following chemical components in percentage by weight: 5 to 50 percent of C, less than or equal to 2 percent of Mn, less than or equal to 0.060 percent of S, less than or equal to 0.060 percent of P, less than or equal to 0.60 percent of Si, and the balance of iron and inevitable impurity elements. In the smelting process of the converter, 0.1-3kg/t of iron-carbon press balls are added at the smelting end point, after the iron-carbon press balls are added, the converter performs bottom blowing, the bottom blowing time is more than or equal to 50s, and the bottom blowing flow is more than or equal to 0.05 Nm 3 And (t.min), and then tapping. After the iron-carbon pressure ball is added into the converter, the sulfur content in the molten steel is reduced by 10-30ppm, and the phosphorus content in the molten steel is reduced by 10-50ppm.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to an iron-carbon pressure ball and a using method thereof.
Background
In the steel-making process, sulfur and phosphorus in most steel grades are harmful elements in steel, and in the steel-tapping process, the sulfur and phosphorus can cause the steel to generate hot brittleness and cold brittleness in the processing and using processes, so that quality defects are caused, and the service performance is influenced. In order to reduce the sulfur and phosphorus content of the molten steel and improve the quality of the molten steel, the most effective, most economical and non-pollution method for the molten steel is to properly prolong the reaction time of the high-alkalinity slag and the molten steel and improve the efficiency of slag desulfurization and phosphorus. At present, the methods for reducing sulfur and phosphorus in molten steel mainly comprise the following two methods: firstly, the alkalinity is improved, and the desulfurization and phosphorus capacities of the slag are increased. Secondly, the slag amount is increased, and the sulfur and the phosphorus are removed by utilizing large slag amount. In both methods, the dosage of auxiliary materials of the converter needs to be increased, and the cost is increased.
Disclosure of Invention
The invention aims to provide an iron-carbon pressure ball and a using method thereof, and a method for reducing the contents of sulfur and phosphorus in molten steel.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the iron-carbon press ball is characterized by comprising the following chemical components in percentage by weight: 5 to 50 percent of C, less than or equal to 2 percent of Mn, less than or equal to 0.060 percent of S, less than or equal to 0.060 percent of P, less than or equal to 0.60 percent of Si, and the balance of Fe and inevitable impurity elements.
The iron-carbon pressure ball is added into the molten steel, carbon in the pressure ball reacts with oxygen in the steel to generate carbon monoxide, the generated CO is utilized to stir the molten steel, dynamic conditions are provided, the full reaction of the steel slag is promoted, sulfur and phosphorus in the molten steel are continuously removed, the molten steel is not polluted, and the production requirement is met.
Furthermore, the weight percentage of impurity elements in the iron-carbon pressed ball is less than or equal to 0.10 percent.
The weight percentage of the impurity elements is less than or equal to 0.10 percent, aiming at reducing the impurity elements brought into the steel as much as possible and reducing the pollution to the molten steel.
Furthermore, the diameter of the iron-carbon pressed ball is less than or equal to 40mm.
The diameter of the iron-carbon pressure ball is less than or equal to 40mm, so that the iron-carbon pressure ball can be completely melted in the molten steel as soon as possible.
A method for using iron-carbon press balls comprises the steps of adding 0.1-3kg/t of iron-carbon press balls at the smelting end point in the smelting process of a converter, and then carrying out bottom blowing in the converter after adding the iron-carbon press balls, wherein the bottom blowing time is more than or equal to 50s, and the bottom blowing flow is more than or equal to 0.05 Nm 3 And (t min), and then tapping.
The purpose of bottom blowing after the iron-carbon press balls are added is to stir a molten pool, ensure that the iron-carbon press balls can be completely melted as soon as possible, promote the reaction of steel slag, ensure that the bottom blowing time is less than 50s and have poor effect of removing sulfur and phosphorus.
Furthermore, the temperature of the molten steel at the smelting end point is more than or equal to 1600 ℃.
The smelting end point temperature is more than or equal to 1600 ℃, and the aim is to ensure that the iron-carbon press balls can be completely melted as soon as possible.
Furthermore, the content of dissolved oxygen in the molten steel at the smelting end point is more than or equal to 500ppm
Furthermore, the carbon content of the finished product of the molten steel smelted by the converter is required to be more than 0.060wt%.
The carbon content of the finished product of the molten steel smelted by the converter is required to be more than 0.060wt%, which is a preferable use condition of the iron-carbon pressure ball. Preferably, iron-carbon press balls are used in the smelting process of steel with the finished product carbon content requirement of more than 0.060wt%, so that the problem that the carbon content of the finished product steel exceeds the standard due to the fact that carbon in the iron-carbon press balls is dissolved into molten steel is avoided.
Further, the carbon content at the smelting end point of the converter is less than or equal to 0.040%.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
after the iron-carbon pressure ball is added into the converter, the sulfur content in the molten steel is reduced by 10-30ppm, and the phosphorus content in the molten steel is reduced by 10-50ppm.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to better illustrate the invention, the following examples are given by way of further illustration.
Examples 1 to 6
Examples 1-6 iron carbon pellets were added at the end of the converter smelting, the compositions and weight percentages of the iron carbon pellets are shown in Table 1, the contents of impurity elements in the pellets do not exceed 0.10wt%, and the diameters of the iron carbon pellets are shown in Table 1. The temperature of the molten steel at the smelting end point of the converter, the oxygen content in the steel and the adding amount of the iron-carbon pressure balls are shown in a table 2, the bottom blowing time and the bottom blowing flow of the converter after the iron-carbon pressure balls are added are shown in the table 2, and the carbon content requirement of the finished steel of the molten steel smelted by the converter and the carbon content of the molten steel at the smelting end point of the converter are shown in the table 2.
TABLE 1
TABLE 2
The contents of P and S in the molten steel at the smelting end point of the converter in the embodiments 1 to 6 are shown in Table 3, and the contents of P and S in the molten steel after tapping of the converter are shown in Table 3.
TABLE 3
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (7)
1. The iron-carbon pressure ball is characterized by being used for adding molten steel at the smelting end point of a converter, and comprising the following chemical components in percentage by weight: 5 to 50 percent of C, less than or equal to 2 percent of Mn, less than or equal to 0.060 percent of S, less than or equal to 0.060 percent of P, less than or equal to 0.60 percent of Si, and the balance of Fe and inevitable impurity elements; after the iron-carbon pressure ball is added into the converter, the sulfur content in the molten steel is reduced by 10-30ppm, and the phosphorus content in the molten steel is reduced by 10-50ppm.
2. The iron-carbon pressed ball as recited in claim 1, wherein the weight percentage of the impurity elements is less than or equal to 0.10%.
3. The iron carbon pressed ball as claimed in claim 1, wherein the diameter of the iron carbon pressed ball is less than or equal to 40mm.
4. The use method of iron carbon briquettes according to any of claims 1 to 3, wherein the iron carbon briquettes are added at 0.1-3kg/t at the end of the smelting in a converter, and after the iron carbon briquettes are added, the converter is bottom blown at a bottom blowing time of 50s or more and a bottom blowing flow rate of 0.05 Nm or more 3 And (t.min), the content of dissolved oxygen in the molten steel at the smelting end point is more than or equal to 500ppm, and then tapping operation is carried out.
5. The use method of the iron-carbon pressure ball as claimed in claim 4, wherein the smelting end point molten steel temperature is not less than 1600 ℃.
6. The use of iron carbon briquettes according to claim 4 or 5, wherein the carbon content of the finished product of molten steel produced in the converter is required to be more than 0.060wt%.
7. The use method of the iron-carbon press ball according to claim 4 or 5, characterized in that the carbon content at the smelting end point of the converter is less than or equal to 0.040%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174017.9A CN112921146B (en) | 2021-02-06 | 2021-02-06 | Iron-carbon press ball and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110174017.9A CN112921146B (en) | 2021-02-06 | 2021-02-06 | Iron-carbon press ball and using method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112921146A CN112921146A (en) | 2021-06-08 |
| CN112921146B true CN112921146B (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110174017.9A Active CN112921146B (en) | 2021-02-06 | 2021-02-06 | Iron-carbon press ball and using method thereof |
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| CN (1) | CN112921146B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54123514A (en) * | 1978-03-18 | 1979-09-25 | Kawasaki Steel Co | Phosphorous removing method of molten steel within converter |
| CN105296703B (en) * | 2014-07-11 | 2017-08-25 | 鞍钢股份有限公司 | Top and bottom combined blown converter phosphor-containing steel smelting process |
| CN104561433B (en) * | 2014-12-24 | 2016-08-24 | 山东钢铁股份有限公司 | A kind of converter smelting method of medium high carbon ultra-low phosphoretic steel water |
| CN107365886B (en) * | 2016-05-13 | 2019-03-26 | 上海梅山钢铁股份有限公司 | A kind of method of converter high temperature dephosphorization |
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- 2021-02-06 CN CN202110174017.9A patent/CN112921146B/en active Active
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| CN112921146A (en) | 2021-06-08 |
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