CN112593039A - Method for reducing smelting cost of non-oriented silicon steel W800 - Google Patents
Method for reducing smelting cost of non-oriented silicon steel W800 Download PDFInfo
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- CN112593039A CN112593039A CN202011611728.XA CN202011611728A CN112593039A CN 112593039 A CN112593039 A CN 112593039A CN 202011611728 A CN202011611728 A CN 202011611728A CN 112593039 A CN112593039 A CN 112593039A
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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
- C21C5/30—Regulating or controlling the blowing
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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
- C21C7/076—Use of slags or fluxes as treating agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a metal smelting process, in particular to a method for reducing the smelting cost of non-oriented silicon steel W800, in the blowing stage, after firing, adding a first batch of slag material, wherein the adding amount of lime accounts for 70% of the total adding amount of lime, the adding amount of limestone accounts for 100% of the total adding amount of limestone, the adding amount of light-burned dolomite accounts for 100% of the total adding amount of light-burned dolomite, and after slagging, the gun position is reduced; adding the rest 30% of lime after slagging, and adjusting the temperature by using ores in the process of adding the rest lime; in the later stage of converting, gradually pressing the gun, pulling the carbon gun position to 1.4m at the end point, and enabling the gun position to be not less than 30s at the height; and reaching the smelting end point. The process reduces the oxidation amount of the manganese in the molten iron and promotes the reduction amount of the manganese oxide by reducing the amount of the converter slag, extracting carbon and reducing oxygen and improving the end temperature, thereby reducing the addition amount of RH metal manganese and reducing the production cost.
Description
Technical Field
The invention relates to a metal smelting process, in particular to a method for reducing the smelting cost of non-oriented silicon steel W800.
Background
Along with the development of industry, the cost is vital to steel enterprises, in the development process of the non-oriented silicon steel W800, the production cost of the non-oriented silicon steel W800 is influenced all the time due to the fact that the manganese content at the end point of the converter is low, the gloom in the prior art is generally in the range of 0.05-0.07%, therefore, a large amount of metal manganese needs to be added in RH vacuum to reach the target value of the manganese content in the steel, the cost is greatly increased, the market proportion price is not favorable, and therefore the problem that the manganese content at the end point of the converter needs to be improved based on the smelting technology is.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for reducing the smelting cost of non-oriented silicon steel W800 by reducing the addition of metal manganese.
The invention adopts the following technical scheme:
a method for reducing the smelting cost of non-oriented silicon steel W800 comprises the following steps:
A. 170-180 tons of desulfurized and drossed molten iron are adopted, and 20-25 tons of pure high-quality scrap steel without steel slag is selected as the scrap steel;
B. in the blowing stage, the lance position of the oxygen lance is 1.9-2.0 m, the flow rate adopts constant flow rate 37000m/3h, after ignition, the first batch of slag is added, the addition amount of lime accounts for 70% of the total addition amount of the lime, the addition amount of limestone accounts for 100% of the total addition amount of the limestone, the addition amount of light-burned dolomite accounts for 100% of the total addition amount of the light-burned dolomite, and after slagging, the lance position is reduced by 0.1-0.3 m;
C. adding the rest 30% of lime after slagging, adjusting the temperature by using ores in the process of adding the rest lime, and adding a small amount of ores in batches when adding the ores;
D. in the later stage of converting, the gun position is controlled at 1.6m, the gun is gradually pressed, the carbon gun position is pulled to 1.4m at the end point, and the gun position is not less than 30s at the height;
E. and reaching the smelting end point.
Compared with the prior art, the invention has the beneficial effects that:
the process reduces the oxidation amount of the manganese in the molten iron and promotes the reduction amount of the manganese oxide by reducing the amount of the converter slag, extracting carbon and reducing oxygen and improving the end point temperature, thereby improving the key residual manganese content, reducing the addition amount of RH metal manganese and reducing the production cost.
Further, the invention adopts the following preferable scheme:
in the step B, the adding amount of lime is 4.2 tons, the adding amount of limestone is 3 tons, and the adding amount of light-burned dolomite is 3 tons.
Detailed Description
A method for reducing the smelting cost of non-oriented silicon steel W800 comprises the following steps:
A. 180 tons of desulfurized and drossed molten iron are adopted, and 25 tons of pure high-quality scrap steel without steel slag are selected as the scrap steel.
B. In the blowing stage, the lance position of the oxygen lance is 2.0m, the flow rate adopts constant flow rate 37000m/3h, after ignition, the first batch of slag charge is added, 4.2 tons of lime is added, accounting for 70% of the total addition amount of the lime, 3 tons of limestone accounting for 100% of the total addition amount of the limestone, 3 tons of light-burned dolomite accounting for 100% of the total addition amount of the light-burned dolomite, and after slag melting, the lance position is gradually reduced by 0.3 m.
C. Adding the rest 30% of lime (1.8 tons) after slagging, adding ore for adjusting the temperature in the process of adding the rest lime, and adding the ore 5-6 batches when adding the ore, wherein the adding amount of the ore is 300-400 kg each time.
D. In the later stage of converting, the gun position is controlled at 1.6m, the gun is gradually pressed, the carbon gun position is pulled to 1.4m at the end point, and the gun position is maintained at the height for not less than 30s, so that the effects of reducing the oxygen content in steel and reducing the manganese oxidation amount of steel are achieved.
E. And when the smelting end point is reached, controlling the carbon content of the converter end point to be 0.05-0.06%, the converter end point temperature to be 1660-1680 ℃, and the residual manganese content in the molten steel to be 0.07-0.09%.
The deoxidation alloying is not carried out in the tapping process, the temperature is measured in an argon station, the steel is sampled and moved, after molten steel enters RH, the circulating decarburization is carried out firstly, then the deoxidation alloying is carried out, and manganese is mixed with metal manganese.
In the smelting process, the waste steel adopts pure high-quality waste steel, steel slag (about 5 tons) is not added into the waste steel, and the amount of converter slag is reduced; the adding amount of lime is reduced from the original 10 tons to 6 tons; the molten iron adopts the low-silicon molten iron subjected to desulfurization and slagging so as to reduce the slag yield of the molten iron.
The method improves the end point carbon content, reduces oxygen in steel, reduces the manganese oxidation technology, controls the end point carbon of the converter to be 0.05-0.06, controls the oxygen value to be 400-700 ppm, and reduces the oxidation amount of manganese in molten steel.
The end point temperature is increased, the manganese oxide reduction technology is promoted, and the steel releasing temperature is increased to 1660-1680 ℃. The reduction of manganese oxide in the slag is promoted, and the end-point residual manganese is improved.
By using smelting technology control, the residual manganese at the end point of the converter is increased to 0.07-0.09 percent, the manganese content is averagely increased by 0.02 percent, the RH vacuum metal manganese is saved by 50 kg/furnace, the cost can be saved by 50kd (metal manganese)/1000 x 10752 yuan/192 =2.83 yuan/ton steel, the cost of W800 series of non-oriented silicon steel per ton steel is reduced, and the enterprise benefit is improved.
The above description is only for the specific embodiment of the present invention, but the protection of the present invention is not limited thereto, and all equivalent changes or substitutions to the technical features of the present invention that can be made by those skilled in the art are included in the protection scope of the present invention.
Claims (2)
1. A method for reducing the smelting cost of non-oriented silicon steel W800 is characterized by comprising the following steps:
A. 170-180 tons of desulfurized and drossed molten iron are adopted, and 20-25 tons of pure high-quality scrap steel without steel slag is selected as the scrap steel;
B. in the blowing stage, the lance position of the oxygen lance is 1.9-2.0 m, the flow rate adopts constant flow rate 37000m/3h, after ignition, the first batch of slag is added, the addition amount of lime accounts for 70% of the total addition amount of the lime, the addition amount of limestone accounts for 100% of the total addition amount of the limestone, the addition amount of light-burned dolomite accounts for 100% of the total addition amount of the light-burned dolomite, and after slagging, the lance position is reduced by 0.1-0.3 m;
C. adding the rest 30% of lime after slagging, adjusting the temperature by using ores in the process of adding the rest lime, and adding a small amount of ores in batches when adding the ores;
D. in the later stage of converting, the gun position is controlled at 1.6m, the gun is gradually pressed, the carbon gun position is pulled to 1.4m at the end point, and the gun position is not less than 30s at the height;
E. and reaching the smelting end point.
2. The method for reducing the smelting cost of the non-oriented silicon steel W800 according to claim 1, wherein the method comprises the following steps: in the step B, the adding amount of lime is 4.2 tons, the adding amount of limestone is 3 tons, and the adding amount of light-burned dolomite is 3 tons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011611728.XA CN112593039A (en) | 2020-12-31 | 2020-12-31 | Method for reducing smelting cost of non-oriented silicon steel W800 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011611728.XA CN112593039A (en) | 2020-12-31 | 2020-12-31 | Method for reducing smelting cost of non-oriented silicon steel W800 |
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| Publication Number | Publication Date |
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| CN112593039A true CN112593039A (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011611728.XA Withdrawn CN112593039A (en) | 2020-12-31 | 2020-12-31 | Method for reducing smelting cost of non-oriented silicon steel W800 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008101232A (en) * | 2006-10-17 | 2008-05-01 | Daido Steel Co Ltd | Method for producing high manganese steel |
| CN102676727A (en) * | 2012-06-01 | 2012-09-19 | 南京钢铁股份有限公司 | Process for controlling smelting silicon content of low-silicon steel |
| CN104694819A (en) * | 2015-03-27 | 2015-06-10 | 山东钢铁股份有限公司 | Production method for low-carbon low-silicon steel |
| CN106148629A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | Method for controlling manganese content of high-manganese molten iron end point |
| CN108660294A (en) * | 2018-05-31 | 2018-10-16 | 江苏省沙钢钢铁研究院有限公司 | Silicon-manganese killed non-oriented silicon steel inclusion control method |
-
2020
- 2020-12-31 CN CN202011611728.XA patent/CN112593039A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008101232A (en) * | 2006-10-17 | 2008-05-01 | Daido Steel Co Ltd | Method for producing high manganese steel |
| CN102676727A (en) * | 2012-06-01 | 2012-09-19 | 南京钢铁股份有限公司 | Process for controlling smelting silicon content of low-silicon steel |
| CN104694819A (en) * | 2015-03-27 | 2015-06-10 | 山东钢铁股份有限公司 | Production method for low-carbon low-silicon steel |
| CN106148629A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | Method for controlling manganese content of high-manganese molten iron end point |
| CN108660294A (en) * | 2018-05-31 | 2018-10-16 | 江苏省沙钢钢铁研究院有限公司 | Silicon-manganese killed non-oriented silicon steel inclusion control method |
Non-Patent Citations (1)
| Title |
|---|
| 孟义春: "提高转炉终点余锰工艺研究", 《山西冶金》 * |
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Application publication date: 20210402 |