CN113789425B - Method for smelting return high silicon steel water by converter - Google Patents
Method for smelting return high silicon steel water by converter Download PDFInfo
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- CN113789425B CN113789425B CN202111076513.7A CN202111076513A CN113789425B CN 113789425 B CN113789425 B CN 113789425B CN 202111076513 A CN202111076513 A CN 202111076513A CN 113789425 B CN113789425 B CN 113789425B
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- converter
- blowing
- steel
- high silicon
- slag
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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
- C21C5/36—Processes yielding slags of special composition
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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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a method for smelting return high-silicon molten steel by a converter, which comprises the steps of adding the return high-silicon molten steel into the converter, and adding molten iron to a preset loading amount so that the silicon content of the molten steel in the converter is less than or equal to 1.0%; the converter adopts a double slag smelting method, and the added slag forming materials comprise active lime, dolomite, light burned dolomite and sinter; when oxygen accumulation reaches 83% -85% during blowing, measuring TSC by using a sublance, blowing to reach the target composition and target temperature of molten steel according to TSC measurement data, lifting the sublance, and tapping. The invention realizes the stable control of the high silicon steel water in the converter smelting return. Reduces the economic loss of steel factories and reduces the accident rate of steelmaking production. Improves the steel-making production operation rate.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for smelting return high-silicon steel water by a converter.
Background
When the high-silicon molten steel is produced, faults of a continuous casting machine can be encountered, the accident that the high-silicon molten steel does not have castability due to the fact that components are not mixed and the like is found before casting, in order to avoid larger economic loss, the high-silicon molten steel must be returned to a converter again, conventional raw materials smelted by the converter are molten iron and scrap steel, and the silicon content of the molten iron is generally about 0.3% -0.6%. The silicon content of common molten steel returned from furnace is about 0.02% -0.5%. However, the silicon content of the high silicon steel water is high and can reach between 1.5 and 3.5 percent, so that great difficulty is caused to converter smelting.
The high-silicon molten steel with ultrahigh silicon content can obviously increase the consumption of slag charge, is extremely easy to cause splashing, has extremely low metal yield, and can further aggravate corrosion to a furnace lining due to excessive SiO2 in slag, influence the melting speed of active lime and obviously prolong blowing time.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for smelting the return high silicon steel water by the converter, so that the purposes of normal smelting of the converter, no splash, qualified temperature and qualified components are achieved.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for smelting return high-silicon molten steel by a converter comprises the following steps: the method comprises the following specific steps of returning high silicon steel water, a converter, an argon station, refining and a casting machine:
1) Load control
Adding returned high silicon molten steel into the converter, adding molten iron to a preset loading amount to ensure that the silicon content of the molten steel in the converter is less than or equal to 1.0 percent, and according to the silicon content of the returned high silicon molten steel, adding the following components into the converter:
adding 1/2 of the furnace return high silicon steel into the converter, wherein the silicon content of the return high silicon steel is less than or equal to 2%;
2 percent is less than 3 percent of the water silicon content of the return high silicon steel, and the return high silicon steel water is added into the converter in a proportion of less than or equal to 1/3 of the converter;
the silicon content of the return high silicon steel water is more than or equal to 3 percent, and the return high silicon steel water of less than or equal to 1/4 of the furnace is added into the converter;
2) Slag formation control
The converter adopts a double slag smelting method, and the added slag forming materials comprise active lime, dolomite, light burned dolomite and sinter; the total addition amount of the sintering ore is = [ (molten iron temperature-1300) + (molten steel silicon content/n-0.3) ×200+180]/20; units: t is; n is the number of times of molten steel blending;
a. slag control before slag discharge: the addition amount of the active lime is as follows: 15+/-0.5 kg/t; the addition amount of dolomite and light burned dolomite is as follows: 15+/-0.5 kg/t; the addition amount of the sintering ore is as follows: adding 1+/-0.5 t of the total amount of the sintering ore; after opening and blowing for 30s, adding in two batches;
b. slag discharge control: the addition amount of the active lime is as follows: 25+ -0.5 kg/t; the addition amount of dolomite and light burned dolomite is as follows: 5+/-0.5 kg/t; sinter added = total sinter added-amount of sinter added before deslagging;
3) Gun position control
a. Blowing gun position: 2600mm-2700mm, oxygen pressure is opened: 0.9MPa-1.05MPa, oxygen blowing flow 53700 + -50 Nm 3 /h; reducing the gun position to 2400+/-10 mm in 1 min+/-30 s of blowing, reducing the gun position to 2200+/-10 mm in 2 min+/-30 s of blowing, reducing the gun position to 2600+/-10 mm in3 min+/-30 s of blowing, reducing the gun position to 3000+/-10 mm in 4 min+/-30 s of blowing, and waiting for 5 min+/-30 s of lifting gun to discharge slag;
b. blowing again after slag discharge, and opening a blowing gun position: 2600+ -10 mm, oxygen flow 48000+ -50 Nm 3 After successful ignition, the gun position is lifted to 2800+/-10 mm, and the oxygen blowing flow is regulated to 53700 +/-50 Nm 3 /h；
4) Endpoint control
When the oxygen is accumulated to 83% -85%, measuring TSC by using a sublance, blowing according to TSC measurement data to reach the target composition and target temperature of molten steel, lifting the sublance, and tapping.
The re-melted high silicon steel water comprises FJACT, FJACT-1, FJACT-2, 50AW470, 50AW800, 50AW1300, 50AW600 and AW800R, DY015-03K.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a method for realizing converter smelting return high silicon steel water through converter loading control, slag formation control, gun position control and end point control. The purpose of normal smelting of the converter is achieved, and stable control of the high silicon steel water returned from the converter smelting is realized. Reduces the economic loss of steel factories and reduces the accident rate of steelmaking production. Improves the steel-making production operation rate.
Detailed Description
The invention is further illustrated by the following examples:
the following examples illustrate the invention in detail. These examples are merely illustrative of the best embodiments of the invention and do not limit the scope of the invention.
Examples
The method for smelting the back-smelting high-silicon molten steel by the converter comprises the following process steps: the method comprises the steps of returning high silicon steel water, a converter, an argon station, refining, a casting machine, smelting steel SPHC, and 270 tons of converter loading, and comprises the following steps:
1) A new D-level ladle is used during tapping, and the turnover time is less than or equal to 100min;
2) Adding molten iron except for the recycled high silicon steel water, wherein the temperature of the molten iron is 1284 ℃ and the silicon content is 0.32%;
3) The target tapping temperature of the converter is 1665 ℃, and the product requirement P is less than or equal to 0.020%;
4) The water silicon content of the high silicon steel is 2.9%, the water amount of the high silicon steel added into the converter is 90 tons, and the water amount of the added iron is 180 tons;
5) After the high silicon molten steel and molten iron are added, blowing oxygen by a lance, and opening the lance position: 2600mm-2700mm, oxygen pressure is opened: 0.9Mpa-1.05Mpa, oxygen blowing flow 53700Nm 3 Adding 3000kg of active lime, 3000kg of dolomite and 500kg of light burned dolomite after successful ignition, blowing for 1min until the gun position is reduced to 2400mm, and adding 3000 of sinterkg, blowing for 2min until the gun position is reduced to 2200mm, simultaneously adding 1000kg of second batch of active lime, 500kg of light burned dolomite, lifting the gun position to 2600mm, blowing for 3min until the gun position is lifted to 3000mm, adding 1000kg of sinter during 4min, and waiting for 5min for 30s of gun lifting and slag discharging;
6) Blowing again after slag discharge, and opening a blowing gun position: 2600mm, oxygen flow 48000Nm 3 After successful ignition, the gun position is lifted to 2800mm, and the oxygen blowing flow is regulated to 53700Nm 3 Adding 7000kg of active lime, 1000kg of dolomite, 500kg of light burned dolomite and 13800kg of residual sinter, and obtaining 9500Nm of oxygen accumulation according to automatic calculation 3 When the gun is used, TSC test is carried out through the sublance, the gun is lifted through the TSC measurement data to be blown to the end point; the end point temperature is 1663 ℃, the oxygen value is 503ppm, the end point P=0.0163% and tapping is carried out;
7) Refining after steel is discharged, and pouring the steel on a machine after the refining treatment is qualified;
8) And (3) continuously adding the residual furnace returning high silicon steel water into different two furnace times for 2 times, and repeating the steps 4) -7) to carry out blowing and casting.
Claims (2)
1. A method for smelting return high-silicon molten steel by a converter comprises the following steps: the method is characterized by comprising the following specific steps of:
1) Load control
Adding high silicon molten steel returned from the converter, and adding molten iron to a preset loading amount to ensure that the silicon content of the molten steel in the converter is less than or equal to 1.0 percent; according to the silicon content of the returned high silicon steel water, the converter is added with the returned high silicon steel water according to the following weight:
adding 1/2 of the furnace return high silicon steel into the converter, wherein the silicon content of the return high silicon steel is less than or equal to 2%;
2 percent is less than 3 percent of the water silicon content of the return high silicon steel, and the return high silicon steel water is added into the converter in a proportion of less than or equal to 1/3 of the converter;
the silicon content of the return high silicon steel water is more than or equal to 3 percent, and the return high silicon steel water of less than or equal to 1/4 of the furnace is added into the converter;
2) Slag formation control
The converter adopts a double slag smelting method, and the added slag forming materials comprise active lime, dolomite, light burned dolomite and sinter; the total addition amount of the sintering ore is = [ (molten iron temperature-1300) + (molten steel silicon content/n-0.3) ×200+180]/20; units: t is; n is the number of times of molten steel blending;
a. slag control before slag discharge: the addition amount of the active lime is as follows: 15+/-0.5 kg/t; the addition amount of dolomite and light burned dolomite is as follows: 15+/-0.5 kg/t; adding 1+/-0.5 t of the total amount of the sintering ore;
b. slag discharge control: the addition amount of the active lime is as follows: 25+ -0.5 kg/t; the addition amount of dolomite and light burned dolomite is as follows: 5+/-0.5 kg/t; sinter added = total sinter added-amount of sinter added before deslagging;
3) Gun position control
a. Blowing gun position: 2600mm-2700mm, oxygen pressure is opened: 0.9MPa-1.05MPa, oxygen blowing flow 53700 + -50 Nm 3 /h; reducing the gun position to 2400+/-10 mm in 1 min+/-30 s of blowing, reducing the gun position to 2200+/-10 mm in 2 min+/-30 s of blowing, reducing the gun position to 2600+/-10 mm in3 min+/-30 s of blowing, reducing the gun position to 3000+/-10 mm in 4 min+/-30 s of blowing, and waiting for 5 min+/-30 s of lifting gun to discharge slag;
b. blowing again after slag discharge, and opening a blowing gun position: 2600+ -10 mm, oxygen flow 48000+ -50 Nm 3 After successful ignition, the gun position is lifted to 2800+/-10 mm, and the oxygen blowing flow is regulated to 53700 +/-50 Nm 3 /h；
4) Endpoint control
When the oxygen is accumulated to 83% -85%, measuring TSC by using a sublance, blowing according to TSC measurement data to reach the target composition and target temperature of molten steel, lifting the sublance, and tapping.
2. The method for smelting back-to-furnace high silicon steel water in a converter according to claim 1, wherein in the step 2) a, slag is added in two batches after being blown for 30 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111076513.7A CN113789425B (en) | 2021-09-14 | 2021-09-14 | Method for smelting return high silicon steel water by converter |
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| CN202111076513.7A CN113789425B (en) | 2021-09-14 | 2021-09-14 | Method for smelting return high silicon steel water by converter |
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| CN113789425A CN113789425A (en) | 2021-12-14 |
| CN113789425B true CN113789425B (en) | 2023-05-12 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102952915B (en) * | 2011-08-20 | 2014-06-04 | 鞍钢股份有限公司 | Phosphorus-containing steel converter smelting method |
| CN105714012A (en) * | 2014-12-01 | 2016-06-29 | 鞍钢股份有限公司 | Converter little slag smelting method for high silicon molten iron |
| CN105950815A (en) * | 2016-06-22 | 2016-09-21 | 山东钢铁股份有限公司 | Recycled steel converter blowing method |
| CN106834592B (en) * | 2017-01-03 | 2019-02-12 | 山东钢铁股份有限公司 | A kind of method that steel treatment is melted down in converter |
| CN112210638B (en) * | 2019-07-10 | 2022-03-11 | 山东钢铁股份有限公司 | Converter smelting method for medium and high silicon molten iron |
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