CN110129512A - A kind of final slag modifier and converter semi-steel making finishing slag method for modifying - Google Patents
A kind of final slag modifier and converter semi-steel making finishing slag method for modifying Download PDFInfo
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- CN110129512A CN110129512A CN201910522310.2A CN201910522310A CN110129512A CN 110129512 A CN110129512 A CN 110129512A CN 201910522310 A CN201910522310 A CN 201910522310A CN 110129512 A CN110129512 A CN 110129512A
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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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention provides a kind of final slag modifier and converter semi-steel making finishing slag method for modifying, belong to metallurgical technology field, and final slag modifier includes: the C of the SiO2 and 12-18% of MgO, 1-6% of 50-55%.Final slag modifier provided by the invention can carry out deoxidation to finishing slag, adjust the content of finishing slag MgO and the viscosity of finishing slag.Converter semi-steel making finishing slag method for modifying includes the following steps: before tapping after finishing blowing, final slag modifier is added into endpoint molten steel.Converter semi-steel making finishing slag method for modifying provided by the invention, converter semi-steel making finishing slag is modified, reduce the oxygen content of molten steel, reduce the content of finishing slag TFe, the content for increasing finishing slag MgO improves the viscosity of finishing slag, improves the mobility of finishing slag, improve the later period in turn splashes slag effect, improves the service life of furnace lining.
Description
Technical field
The invention belongs to metallurgical technology fields, are to be related to a kind of final slag modifier and converter semi-steel making more specifically
Finishing slag method for modifying.
Background technique
Molten iron carries out vanadium extraction processing, and the molten iron after vanadium extraction is known as half steel, and half steel enters converter again smelt as qualification
Molten steel.Converter semi-steel making causes steel-making shortage of heat, slugging difficulty, iron since its silicon, titanium, manganese heating element are trace
Calcium slag system is unreasonable, causes Oxygen Content in Liquid Steel after steel making operation high, iron oxide content is higher in slag, and iron oxide is in basic slag
The viscosity that can significantly reduce slag causes converter semi-steel making finishing slag diluter, and mobility is strong, and affect converter lining life uses the longevity
Life.
Summary of the invention
The purpose of the present invention is to provide a kind of final slag modifier and converter semi-steel making finishing slag method for modifying, it is intended to solve
After the operation of converter semi-steel making, Oxygen Content in Liquid Steel is high, and iron oxide content is higher in slag, and finishing slag is diluter, and mobility is strong, influences to make steel
The technical issues of cost and converter lining life.
To achieve the above object, the technical solution adopted by the present invention is that: providing a kind of final slag modifier includes 50-55%'s
The SiO of MgO, 1-6%2With the C of 12-18%.
Further, the granularity of the final slag modifier is 10-30mm.
The beneficial effect of final slag modifier provided by the invention is: compared with prior art, final slag modifier of the present invention
In C reacted with the iron oxide in finishing slag after to finishing slag carry out deoxidation, significantly reduce the oxygen content in converter；Finishing slag modification
MgO in agent can be used for adjusting the content of finishing slag MgO and the viscosity of finishing slag, improve the mobility of finishing slag；In final slag modifier
SiO2Conducive to finishing slag basicity is reduced, further improve the mobility of finishing slag, additionally it is possible to play the effect for increasing furnace inner heat source.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of modification of converter semi-steel making finishing slag is also provided
Above-mentioned final slag modifier is added into endpoint molten steel before tapping after finishing blowing for method.
Further, converter semi-steel making finishing slag method for modifying includes the following steps:
(1) before tapping after finishing blowing, endpoint molten steel oxygen content in converter is measured；
(2) according to the endpoint molten steel oxygen content, the final slag modifier is added into converter；
(3) converter top gun gun bit is adjusted, top blast nitrogen carries out residue adjustment operation, while bottom blowing inertia into converter using top gun
Gas；
(4) after tapping steel, slag is splashed.
Further, in step (2), when molten steel terminal oxygen content is more than or equal to 800ppm, 4- is added into converter
The final slag modifier of 5Kg/t；When molten steel terminal oxygen content is greater than 600ppm and is less than 800ppm, 2.5- is added into converter
The final slag modifier of 3.5Kg/t；When molten steel terminal oxygen content is greater than 500ppm and is less than or equal to 600ppm, it is added into converter
The final slag modifier of 2-3Kg/t；When molten steel terminal oxygen content is less than or equal to 500ppm, it is added 1.5-2Kg/t's into converter
Final slag modifier.
Further, in step (3), converter top gun gun bit is away from liquid level 3200mm-3600mm, and nitrogen flow is
33000Nm3/h-37000Nm3/ h, mixing time 1-2s.
Further, in step (4), the inert gas of bottom blowing is nitrogen or argon gas, and bottom blowing flow is 1000NM3/ h,
After stir the time be 60 seconds.
The beneficial effect of converter semi-steel making finishing slag method for modifying provided by the invention is: compared with prior art, this
Invention converter semi-steel making finishing slag method for modifying detects the oxygen content of converter molten steel, and contain according to the oxygen in blowing end point
Amount, final slag modifier appropriate is added into converter, the C in final slag modifier reacted with the iron oxide in finishing slag after to finishing slag into
Row deoxidation significantly reduces the oxygen content in converter；MgO in final slag modifier can be used for adjusting finishing slag MgO content and
The viscosity of finishing slag improves the mobility of finishing slag；SiO in final slag modifier2Conducive to finishing slag basicity is reduced, further improve finishing slag
Mobility, additionally it is possible to play increase furnace inner heat source effect.Therefore converter semi-steel making finishing slag method for modifying of the present invention, to converter
Semi-steel making finishing slag is modified, and the oxygen content of molten steel is reduced, and reduces the content of finishing slag TFe, increases finishing slag MgO's
Content improves the viscosity of finishing slag, improves the mobility of finishing slag, and then improve the later period splashes slag effect, improves furnace lining
Service life.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Now converter semi-steel making finishing slag method for modifying provided by the invention is illustrated.The converter semi-steel making finishing slag
Method for modifying includes the following steps:
(1) before tapping after finishing blowing, endpoint molten steel oxygen content in converter is measured；
(2) according to the endpoint molten steel oxygen content, the final slag modifier, the final slag modifier packet are added into converter
It includes: the SiO of MgO, 1-6% of 50-55%2With the C of 12-18%；
(3) converter top gun gun bit is adjusted, top blast nitrogen carries out residue adjustment operation, while bottom blowing inertia into converter using top gun
Gas；
(4) after tapping steel, slag is splashed.
Converter semi-steel making finishing slag method for modifying provided by the invention, compared with prior art, converter provided by the invention
The beneficial effect of semi-steel making finishing slag method for modifying is: compared with prior art, converter semi-steel making finishing slag modification of the present invention
Method detects the oxygen content of converter molten steel in blowing end point, and according to the oxygen content, end appropriate is added into converter
Slag modifier, the C in final slag modifier carry out deoxidation to finishing slag after reacting with the iron oxide in finishing slag, significantly reduce converter
Interior oxygen content；MgO in final slag modifier can be used for adjusting the content of finishing slag MgO and the viscosity of finishing slag, improve the stream of finishing slag
Dynamic property；SiO in final slag modifier2Conducive to finishing slag basicity is reduced, further improve the mobility of finishing slag, additionally it is possible to play increase
The effect of furnace inner heat source.Therefore converter semi-steel making finishing slag method for modifying of the present invention, converter semi-steel making finishing slag is modified,
The oxygen content for reducing molten steel reduces the content of finishing slag TFe, increases the content of finishing slag MgO, improves the viscosity of finishing slag,
The mobility of finishing slag is improved, and then improve the later period splashes slag effect, improves the service life of furnace lining.
As a kind of specific embodiment of converter semi-steel making finishing slag method for modifying provided by the invention, the finishing slag changes
The granularity of matter agent is 10-30mm.If it is difficult to will lead to fusing since final slag modifier granularity is excessive；If undersized, meeting
It is splashed on furnace lining in Blowing Nitrogen Process or while splashing slag, influences to modify effect.
As a kind of specific embodiment of converter semi-steel making finishing slag method for modifying provided by the invention, in step (3)
In, converter top gun gun bit is 3200mm-3600mm, nitrogen flow 33000Nm3/h-37000Nm3/ h, mixing time 1-2s.
Top gun gun bit refers to the height of liquid steel level in top lance spray nozzle and converter.When top gun gun bit is 3600mm, nitrogen flow is
35000Nm3When/h, it can guarantee that top gun preferably transmits nitrogen to molten bath, melt final slag modifier, and guarantee good stirring
Effect.
As a kind of specific embodiment of converter semi-steel making finishing slag method for modifying provided by the invention, in step (4)
In, the inert gas of bottom blowing is nitrogen or argon gas, and bottom blowing flow-rate ratio normal process improves 200NM3/ h, after stir the time be 60 seconds.
While top blast nitrogen, the effect of bottom blowing inert gas is to improve mixing effect, and when bottom blowing flow more normally blows improves
200NM3/h.While top blast nitrogen, bottom blowing inert gas has preferable stirring action, makes finishing slag mixing more evenly.It can
Choosing, bottom blowing flow is 1000NM3/h.But bottom blowing flow should not be too large, and otherwise can offset the mixing effect of top blast.
As a kind of specific embodiment of converter semi-steel making finishing slag method for modifying provided by the invention, in step (2)
In, when molten steel terminal oxygen content is more than or equal to 800ppm, the final slag modifier of 4-5Kg/t is added into converter；When molten steel end
When point oxygen content is greater than 600ppm and is less than 800ppm, the final slag modifier of 2.5-3.5Kg/t is added into converter；When molten steel end
When point oxygen content is greater than 500ppm and is less than or equal to 600ppm, the final slag modifier of 2-3Kg/t is added into converter；When molten steel end
When point oxygen content is less than or equal to 500ppm, the final slag modifier of 1.5-2Kg/t is added into converter；When molten steel terminal oxygen content connects
When nearly 400ppm, 1.5 final slag modifier is added into converter.
Modification converter semi-steel making finishing slag and normal process tracking compare through the foregoing embodiment, the TFe% in finishing slag
With the content balance of MgO%, see the table below:
| Finishing slag TFe% | Finishing slag MgO% | |
| Technique after finishing slag modification | 22.7 | 8.2 |
| Normal process | 23.6 | 7.6 |
| Difference | -0.9 | 0.6 |
As seen from the above table, by the converter semi-steel making finishing slag method for modifying of the present embodiment, the content ratio of finishing slag TFe% is just
Normal technique low 0.9%, and the content of finishing slag MgO% is higher than normal process by 0.6%, effectively raises the viscosity of finishing slag, improves
The mobility of finishing slag.
Above-described embodiment for a better understanding of the present invention is further described it below with reference to specific example.
Example one:
Produce steel grade SS400,170 tons of half steel weight, 16 tons of steel scrap, 1372 DEG C of half steel temperature, half steel chemical component weight
Percentage are as follows: C:3.68%, Si:0.005%, Mn:0.03%, P:0.123%, S:0.036%, Ti:0.009%, converter are whole
Point target ingredient is [C] 0.06-0.10%, [S]≤0.035%, [P]≤0.025%.
Step 1: lime 25.1Kg/t, light dolomite 13.8Kg/t, machine burning mine 5.2Kg/t, blowing is added in converting process
Process is steady, and/t is found in oxygen supply 39.5, and finishing blowing measures 1635 DEG C of temperature using sublance.
Step 2: after finishing blowing, molten steel terminal oxygen content 425ppm, result of laboratory test [C]: 0.067%, [S]:
0.027%, [P]: 0.021%.
Step 3: taking the finishing slag sample before not modifying to analyze down to big face converter, TFe content is that 23.1%, MgO contains
Amount is 7.4%.
Step 4: converter is vertical straight, the final slag modifier of 1.5Kg/t, granularity 20mm, finishing slag modification are added into converter
Agent includes: 50% MgO, 4% SiO2, 13% C and inevitably bring a small amount of H into2O, the impurity such as P and S.
Step 5: position of the adjustment converter top gun gun bit apart from liquid level 3600mm, using top gun into converter top blast
35000Nm3The nitrogen of/h is stirred 2 seconds, at the same time, nitrogen or argon gas is blown into furnace from converter bottom, general pipeline flow is
1000NM3/ h, after stir 60 seconds.
Step 6: after tap.
In tapping process, observes and do not occur the final slag modifier not melted and sticky compared with normal process scoriform in furnace.It takes
Finishing slag sample after modification is analyzed, and TFe content is 22.4%, lower than normal process 0.7%；Content of MgO is 8.1%, than
Normal process is high by 0.7%.Tapping, which finishes, directly to be carried out splashing slag, is splashed slag effect and is met technique requirement.
Example two:
Produce steel grade SPHC, 167 tons of half steel weight, 19 tons of steel scrap, 1365 DEG C of half steel temperature, half steel chemical component weight hundred
Divide ratio are as follows: C:3.61%, Si:0.004%, Mn:0.02%, P:0.119%, S:0.021%, Ti:0.007%, converter terminal
Target component is [C]≤0.04%, [S]≤0.020%, [P]≤0.015%.
Step 1: lime 29.1Kg/t, light dolomite 14.4Kg/t, machine burning mine 2.3Kg/t, blowing is added in converting process
Process is steady, and/t is found in oxygen supply 44.5, and finishing blowing measures 1623 DEG C of temperature using sublance.
Step 2: after finishing blowing, molten steel terminal oxygen content 869ppm, result of laboratory test [C]: 0.036%, [S]:
0.016%, [P]: 0.012%.
Step 3: taking the finishing slag sample before not modifying to analyze down to big face converter, TFe content is that 24.3%, MgO contains
Amount is 7.9%.
Step 4: converter is vertical straight, the final slag modifier of 4.3Kg/t, granularity 30mm, finishing slag modification are added into converter
Agent includes: 55% MgO, 3% SiO2, 15% C and inevitably bring a small amount of H into2O, the impurity such as P and S.
Step 5: position of the adjustment converter top gun gun bit apart from liquid level 3600mm, using top gun into converter top blast
33000Nm3The nitrogen of/h is stirred 2 seconds, at the same time, nitrogen or argon gas is blown into furnace from converter bottom, general pipeline flow is
1000NM3/ h, after stir 60 seconds.
Step 6: after tap.
In tapping process, observes and do not occur the final slag modifier not melted and sticky compared with normal process scoriform in furnace.It takes
Finishing slag sample after modification is analyzed, and TFe content is 22.8%, lower than normal process 1.5%；Content of MgO is 8.4%, than
Normal process is high by 0.5%.Tapping, which finishes, directly to be carried out splashing slag, is splashed slag effect and is met technique requirement.
Example three:
Produce steel grade Q235B, 169 tons of half steel weight, 17 tons of steel scrap, 1374 DEG C of half steel temperature, half steel chemical component weight
Percentage are as follows: C:3.71%, Si:0.004%, Mn:0.02%, P:0.121%, S:0.032%, Ti:0.008%, converter are whole
Point target ingredient is [C] 0.07-0.10%, [S]≤0.035%, [P]≤0.025%.
Step 1: lime 24.6Kg/t, light dolomite 12.9Kg/t, machine burning mine 4.3Kg/t, blowing is added in converting process
Process is steady, and/t is found in oxygen supply 40.1, and finishing blowing measures 1632 DEG C of temperature using sublance.
Step 2: after finishing blowing, molten steel terminal oxygen content 423ppm, result of laboratory test [C]: 0.069%, [S]:
0.026%, [P]: 0.020%.
Step 3: taking the finishing slag sample before not modifying to analyze down to big face converter, TFe content is that 22.3%, MgO contains
Amount is 7.9%.
Step 4: converter is vertical straight, the final slag modifier of 1.8Kg/t, granularity 15mm, finishing slag modification are added into converter
Agent includes: 54% MgO, 3% SiO2, 14% C and inevitably bring a small amount of H into2O, the impurity such as P and S.
Step 5: position of the adjustment converter top gun gun bit apart from liquid level 3400mm, using top gun into converter top blast
35000Nm3The nitrogen of/h is stirred 2 seconds, at the same time, nitrogen or argon gas is blown into furnace from converter bottom, general pipeline flow is
1000NM3/ h, after stir 60 seconds.
Step 6: after tap.
In tapping process, observes and do not occur the final slag modifier not melted and sticky compared with normal process scoriform in furnace.It takes
Finishing slag sample after modification is analyzed, and TFe content is 21.6%, lower than normal process 0.7%；Content of MgO is 8.4%, than
Normal process is high by 0.5%.Tapping, which finishes, directly to be carried out splashing slag, is splashed slag effect and is met technique requirement.
Example four:
Produce steel grade SPHC, 167 tons of half steel weight, 19 tons of steel scrap, 1365 DEG C of half steel temperature, half steel chemical component weight hundred
Divide ratio are as follows: C:3.61%, Si:0.004%, Mn:0.02%, P:0.119%, S:0.021%, Ti:0.007%, converter terminal
Target component is [C]≤0.04%, [S]≤0.020%, [P]≤0.015%.
Step 1: lime 29.1Kg/t, light dolomite 14.4Kg/t, machine burning mine 2.3Kg/t, blowing is added in converting process
Process is steady, and/t is found in oxygen supply 44.5, and finishing blowing measures 1623 DEG C of temperature using sublance.
Step 2: after finishing blowing, molten steel terminal oxygen content 869ppm, result of laboratory test [C]: 0.036%, [S]:
0.016%, [P]: 0.012%.
Step 3: taking the finishing slag sample before not modifying to analyze down to big face converter, TFe content is that 24.3%, MgO contains
Amount is 7.9%.
Step 4: converter is vertical straight, the final slag modifier of 4.8Kg/t, granularity 15mm, finishing slag modification are added into converter
Agent includes: 51% MgO, 6% SiO2, 12% C and inevitably bring a small amount of H into2O, the impurity such as P and S.
Step 5: position of the adjustment converter top gun gun bit apart from liquid level 3500mm, using top gun into converter top blast
36000Nm3The nitrogen of/h is stirred 1 second, at the same time, nitrogen or argon gas is blown into furnace from converter bottom, general pipeline flow is
1000NM3/ h, after stir 60 seconds.
Step 6: after tap.
In tapping process, observes and do not occur the final slag modifier not melted and sticky compared with normal process scoriform in furnace.It takes
Finishing slag sample after modification is analyzed, and TFe content is 22.9%, lower than normal process 1.4%；Content of MgO is 8.3%, than
Normal process is high by 0.4%.Tapping, which finishes, directly to be carried out splashing slag, is splashed slag effect and is met technique requirement.
Example five:
Produce steel grade SPA-H, 165 tons of half steel weight, 16 tons of steel scrap, 1363 DEG C of half steel temperature, half steel chemical component weight
Percentage are as follows: C:3.66%, Si:0.004%, Mn:0.02%, P:0.123%, S:0.027%, Ti:0.007%, converter are whole
Point target ingredient is [C]≤0.04%, [S]≤0.020%, [P]: 0.020%-0.050%.
Step 1: lime 15.1Kg/t, light dolomite 13.8Kg/t, machine burning mine 2.1Kg/t, blowing is added in converting process
Process is steady, and/t is found in oxygen supply 42.3, and finishing blowing measures 1632 DEG C of temperature using sublance.
Step 2: after finishing blowing, molten steel terminal oxygen content 518ppm, result of laboratory test [C]: 0.031%, [S]:
0.018%, [P]: 0.035%.
Step 3: taking the finishing slag sample before not modifying to analyze down to big face converter, TFe content is that 20.1%, MgO contains
Amount is 7.2%.
Step 4: converter is vertical straight, the final slag modifier of 2.3Kg/t, granularity 15mm, finishing slag modification are added into converter
Agent includes: 53% MgO, 3% SiO2, 15% C and inevitably bring a small amount of H into2O, the impurity such as P and S.
Step 5: position of the adjustment converter top gun gun bit apart from liquid level 3200mm, using top gun into converter top blast
37000Nm3The nitrogen of/h is stirred 2 seconds, at the same time, nitrogen or argon gas is blown into furnace from converter bottom, general pipeline flow is
1000NM3/ h, after stir 60 seconds.
Step 6: after tap.
In tapping process, observes and do not occur the final slag modifier not melted and sticky compared with normal process scoriform in furnace.It takes
Finishing slag sample after modification is analyzed, and TFe content is 19.6%, lower than normal process 0.5%；Content of MgO is 7.9%, than
Normal process is high by 0.7%.Tapping, which finishes, directly to be carried out splashing slag, is splashed slag effect and is met technique requirement.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of final slag modifier characterized by comprising the SiO of MgO, 1-6% of 50-55%2With the C of 12-18%.
2. final slag modifier as described in claim 1, which is characterized in that granularity 10-30mm.
3. converter semi-steel making finishing slag method for modifying, which is characterized in that before tapping after finishing blowing, be added into endpoint molten steel
Final slag modifier of any of claims 1 or 2.
4. converter semi-steel making finishing slag method for modifying as claimed in claim 3, which comprises the steps of:
(1) before tapping after finishing blowing, endpoint molten steel oxygen content in converter is measured；
(2) according to the endpoint molten steel oxygen content, the final slag modifier is added into converter；
(3) converter top gun gun bit is adjusted, top blast nitrogen carries out residue adjustment operation, while bottom blowing indifferent gas into converter using top gun
Body；
(4) after tapping steel, slag is splashed.
5. converter semi-steel making finishing slag method for modifying as claimed in claim 4, which is characterized in that in step (2), work as molten steel
When terminal oxygen content is more than or equal to 800ppm, the final slag modifier of 4-5Kg/t is added into converter；When molten steel terminal oxygen content is big
In 600ppm and be less than 800ppm when, into converter be added 2.5-3.5Kg/t final slag modifier；When molten steel terminal oxygen content is big
In 500ppm and be less than or equal to 600ppm when, into converter be added 2-3Kg/t final slag modifier；When molten steel terminal oxygen content is small
When being equal to 500ppm, the final slag modifier of 1.5-2Kg/t is added into converter.
6. converter semi-steel making finishing slag method for modifying as described in claim 4 or 5, which is characterized in that in step (3), turn
Furnace top gun gun bit is away from liquid level 3200mm-3600mm, nitrogen flow 33000Nm3/h-37000Nm3/ h, mixing time 1-
2s。
7. converter semi-steel making finishing slag method for modifying as described in claim 4 or 5, which is characterized in that in step (4), bottom
The inert gas blown is nitrogen or argon gas, and bottom blowing flow is 1000NM3/ h, after stir the time be 60 seconds.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112662835A (en) * | 2020-12-10 | 2021-04-16 | 四川德胜集团钒钛有限公司 | Converter semi-steel smelting furnace protection method |
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| CN1264745A (en) * | 2000-02-22 | 2000-08-30 | 伍发贵 | Final slag modifier for smelting steel in converter |
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Application publication date: 20190816 |