CN108060289B - A kind of temperature-compensating refinery practice of RH refining furnace production IF steel - Google Patents
A kind of temperature-compensating refinery practice of RH refining furnace production IF steel Download PDFInfo
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- CN108060289B CN108060289B CN201711313398.4A CN201711313398A CN108060289B CN 108060289 B CN108060289 B CN 108060289B CN 201711313398 A CN201711313398 A CN 201711313398A CN 108060289 B CN108060289 B CN 108060289B
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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
- C21C7/10—Handling in a vacuum
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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
- C21C7/0006—Adding metallic additives
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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
- C21C7/072—Treatment with gases
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Abstract
The invention discloses a kind of temperature-compensating refinery practices of RH refining furnace production IF steel, belong to iron and steel smelting technology field.Step of the invention are as follows: molten steel arrives at a station after jacking, measures the inlet temperature of molten steel and the oxygen content that enters the station；Judge whether molten steel needs to carry out temperature-compensating, and temperature offset, while vacuumize process is carried out to molten steel；Judge whether molten steel needs to carry out oxygen blast processing, determines blowing oxygen quantity；Heating aluminum shot is added in batches；After heating aluminum shot is added, lift gas flow measures oxygen content after decarburization；The amount of deoxidation aluminum shot and alloying aluminum shot is added；Alloy material is added, Alloying Treatment is carried out to molten steel；Vacuum breaker after molten steel circulation；Argon is stirred only after vacuum breaker.The present invention adds aluminium to carry out temperature-compensating in decarburization early period, while adjusting vacuum degree, lift gas flow, and increases steel ladle bottom argon blowing after breaking vacuum, so that Al2O3It sufficiently excludes, ensure that continuous-cast blank quality, avoid Al2O3The blocking casting mouth of a river, has significant economic benefit.
Description
Technical field
The invention belongs to iron and steel smelting technology field, especially a kind of temperature-compensating of RH refining furnace production IF steel refines work
Skill.
Background technique
RH refining furnace is to produce IF steel to refine equipment, undertakes decarburization, deoxidation, alloying, temperature adjustment, removes
It is mingled with equal metallurgical functions.IF steel smelting process are as follows: KR → converter → Argon station → RH → continuous casting, wherein converter control molten steel goes out
Steel temperature, molten steel, since the factors such as timing, ladle hot situation influence, it is low to easily lead to liquid steel temperature into after RH process；In order to allow steel
Continuous casting working procedure casting in road requires after water meets, and needs to carry out temperature-compensating when refining in RH refining furnace.
Temperature-compensating when domestic steel mill IF steel refines in RH refining furnace is all made of at the end of RH decarburization plus aluminium, utilizes
Alumina reaction generates chemical heat and allows molten steel heating, and the weakness of this technique is: IF steel smelting process, by the later process continuous casting time
Joint rigidity requirement, the refining time of RH refining furnace be it is conditional, due in RH refining furnace plus aluminium time lag, to molten steel matter
Measure harmful alumina reaction product Al2O3Short, the Cleanliness of Molten Steel level error that effectively removes the time, the correspondence slab produced needs
Degrade disposition；If there is a large amount of alumina reacts deoxidation products Al2O3It is trapped in molten steel, continuous casting casting process is easy blocking water
Mouthful, it be easy to cause and unplanned stops pour Deng production accidents；Both the above situation will all cause huge economic loss.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of RH refining furnace production IF steel temperature-compensating refinery practice,
Add aluminium to carry out temperature-compensating early period in decarburization, while adjusting vacuum degree, lift gas flow, and increase Ladle Bottom after breaking vacuum
Argon promotes Al2O3It sufficiently excludes, ensure that continuous-cast blank quality, avoid Al2O3The blocking casting mouth of a river, has significant warp
Ji benefit.
To achieve the goals above, the present invention uses following temperature compensation technique:
Step 1: molten steel arrives at a station after jacking, measures the inlet temperature of molten steel and the oxygen content that enters the station；
Step 2: cooling down according to the inlet temperature of measurement, decarbonizing process cooling, deoxidation process heating and alloying process,
Judge whether molten steel needs to carry out temperature-compensating, and temperature offset；Vacuumize process is carried out to molten steel simultaneously；
Step 3: determining the need for carrying out oxygen blast processing according to temperature compensation value, the oxygen content that enters the station and the carbon content that enters the station,
Determine blowing oxygen quantity；When vacuum degree reaches 100~150mbar, RH top gun oxygen blast is utilized；
Step 4: determining the amount of heating aluminum shot according to temperature compensation value, and after oxygen blast, heating aluminium is added in batches
Grain；
Step 5: after heating aluminum shot is added, adjustment vacuum degree≤1.0mbar, promotion dip pipe gas flow 160~
180Nm3/h；When CO content≤2% in RH refining furnace exhaust, decarburization terminates, while measuring oxygen content after decarburization；
Step 6: deoxidation aluminum shot and alloying aluminium are determined according to the content of dissolved aluminum in oxygen content after decarburization and target molten steel
The amount of grain；Before aluminum shot addition, vacuum degree≤1.0mbar and 160~180Nm of gas flow is kept3/h；2min is added in aluminum shot
Afterwards, adjustment vacuum degree is 60~100mbar, 90~110Nm of lift gas flow3/h；Molten steel circulation time is 4min；
Step 7: alloy material is added to molten steel progress Alloying Treatment after recycling 4min in molten steel；
Step 8: after molten steel Alloying Treatment, adjustment vacuum degree be 60~100mbar, lift gas flow 90~
110Nm3/ h, molten steel recycle vacuum breaker after 6min in this case；
Step 9: Argon is stirred only after vacuum breaker, and 2 road argon gas, argon flow 25Nm is first set separately3/h；It is dropped after 10 seconds
Low argon flow, is slightly wriggled with the top of the slag, subject to molten steel is not exposed；Argon stirs the time only as 6min.
Preferably, whether the molten steel needs to carry out the judgment method of temperature-compensating are as follows:
According to △ T=T0-(T1-T2+T3-T4)；
In formula, T0For outbound target temperature；T1For inlet temperature；T2Temperature is reduced for decarburization；T3Temperature is increased for aluminum shot deoxidation
Degree；T4Temperature is reduced for alloying；
When T≤0 DEG C △, it is not required to carry out temperature-compensating, at this time T=0 DEG C of temperature compensation value；As 0 DEG C of △ T >, temperature need to be carried out
Degree compensates, at this time temperature compensation value T=△ T.
Preferably, whether the molten steel needs to carry out the judgment method of oxygen blast processing are as follows:
According to △ Q=α × T- (Q1-Q2-Q0)；
In formula, T is temperature compensation value；Q0For decarburization target end oxygen content；Q1For the oxygen content that enters the station；Q2For decarburization consumption
Oxygen content；α is oxygen content needed for every 1 DEG C of the raising of molten steel, unit ppm；
When Q≤0 △；It is not required to carry out oxygen blast processing, blowing oxygen quantity is 0 at this time；As △ Q > 0, oxygen blast processing need to be carried out, at this time
Blowing oxygen quantity is V.
Preferably, the blowing oxygen quantity V are as follows:
V=β × △ Q；
In formula, β is blowing oxygen quantity needed for the every increase 1ppm of Oxygen Content in Liquid Steel, unit Nm3。
Preferably, the amount M of the heating aluminum shot are as follows:
M=γ × T；
In formula, T is temperature compensation value；γ is by liquid steel temperature 1 DEG C of addition aluminum shot amount of every raising, unit kg.
Compared with disclosed RH temperature-compensation method:
The present invention is by temperature-compensating time advance to decarburization early period, while not changing RH refining furnace refining time, increases
Temperature reaction product Al is added2O3Effectively remove the time, after heating aluminum shot is added, by adjusting vacuum degree and lift gas
Flow increases steel ladle bottom argon blowing after broken sky, so that Al2O3It sufficiently excludes, so that Cleanliness of Molten Steel is high, ensure that pair produced
Slab quality is answered, Al is avoided2O3The blocking casting mouth of a river；The present invention is safe and reliable, has significant economic benefit.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, in favor of those skilled in the art
It can more be apparent from.
Design factor in embodiment: α is 25ppm/1 DEG C, β 0.5Nm3/ ppm, γ are 12kg/ DEG C.
Embodiment 1
The present embodiment uses following processing step:
Step 1: molten steel arrives at a station after jacking, measures the inlet temperature of molten steel and the oxygen content that enters the station；
Step 2: cooling down according to the inlet temperature of measurement, decarbonizing process cooling, deoxidation process heating and alloying process,
Judge whether molten steel needs to carry out temperature-compensating, and temperature offset；Vacuumize process is carried out to molten steel simultaneously；
Step 3: determining the need for carrying out oxygen blast processing according to temperature compensation value, the oxygen content that enters the station and the carbon content that enters the station,
Determine blowing oxygen quantity；When vacuum degree reaches 100~150mbar, RH top gun oxygen blast is utilized；
Step 4: determining the amount of heating aluminum shot according to temperature compensation value, and after oxygen blast, heating aluminium is added in batches
Grain；
Step 5: after heating aluminum shot is added, adjustment vacuum degree≤1.0mbar, promotion dip pipe gas flow 160~
180Nm3/h；When CO content≤2% in RH refining furnace exhaust, decarburization terminates, while measuring oxygen content after decarburization；
Step 6: deoxidation aluminum shot and alloying aluminium are determined according to the content of dissolved aluminum in oxygen content after decarburization and target molten steel
The amount of grain；Before aluminum shot addition, vacuum degree≤1.0mbar and 160~180Nm of gas flow is kept3/h；2min is added in aluminum shot
Afterwards, adjustment vacuum degree is 60~100mbar, 90~110Nm of lift gas flow3/h；Molten steel circulation time is 4min；
Step 7: alloy material is added to molten steel progress Alloying Treatment after recycling 4min in molten steel；
Step 8: after molten steel Alloying Treatment, adjustment vacuum degree be 60~100mbar, lift gas flow 90~
110Nm3/ h, molten steel recycle vacuum breaker after 6min in this case；
Step 9: Argon is stirred only after vacuum breaker, and 2 road argon gas, argon flow 25Nm is first set separately3/h；It is dropped after 10 seconds
Low argon flow, is slightly wriggled with the top of the slag, subject to molten steel is not exposed；Argon stirs the time only as 6min.
The present embodiment is with 310 tons of preparation IF steel of molten steel, outbound target temperature T0It is 1585 DEG C, inlet temperature T1It is 1590 DEG C,
Decarburization reduces temperature T2It is 31 DEG C, aluminum shot deoxidation increases temperature T3It is 12 DEG C, alloying reduces temperature T4It is 10 DEG C, decarburization terminates
Targeted oxygen content Q0For 300ppm, calculates decarburization and consume oxygen content Q2For 1.33 × 360ppm=478.8ppm, the oxygen content that enters the station Q1
For 450ppm；
So, whether the molten steel needs to carry out the judgement of temperature-compensating: △ T=T0-(T1-T2+T3-T4)=24 DEG C；△T
0 DEG C of >, temperature-compensating need to be carried out, at this time T=24 DEG C of temperature compensation value.
Whether the molten steel needs to carry out the judgement of oxygen blast processing: △ Q=α × T- (Q1-Q2-Q0)=928.8ppm；△Q
> 0 need to carry out oxygen blast processing, and blowing oxygen quantity is V=β × △ Q=464.4Nm at this time3；
The amount M of the heating aluminum shot are as follows: M=γ × T=288kg.
Embodiment 2
The design parameter of the present embodiment requires, temperature-compensating judgement and oxygen blast processing judgement are as shown in table 1~6, this reality
A treatment process is applied with embodiment 1.
Embodiment 3
The design parameter of the present embodiment requires, temperature-compensating judgement and oxygen blast processing judgement are as shown in table 1~6, this reality
A treatment process is applied with embodiment 1.
Embodiment 4
The design parameter of the present embodiment requires, temperature-compensating judgement and oxygen blast processing judgement are as shown in table 1~6, this reality
A treatment process is applied with embodiment 1.
Embodiment 5
The design parameter of the present embodiment requires, temperature-compensating judgement and oxygen blast processing judgement are as shown in table 1~6, this reality
A treatment process is applied with embodiment 1.
Embodiment 6
The design parameter of the present embodiment requires, temperature-compensating judgement and oxygen blast processing judgement are as shown in table 1~6, this reality
A treatment process is applied with embodiment 1.
1 IF composition of steel of table requires (%)
Whether 2 RH of table needs temperature-compensating judgement and parameter
3 temperature-compensating of table is practical to be added aluminum amount and adds aluminium batch
Vacuum degree, lift gas flowmeter in 4 refining process of table
Process treatment time in 5 refining process of table
6 refinery practice of table treated product situation
The temperature-compensating refinery practice of RH refining furnace production IF steel of the present invention, according to specific during liquid steel refining
Situation performs corresponding processing molten steel, and as shown in table 6, gained slab quality is good, not degraded.
Claims (5)
1. a kind of temperature-compensating refinery practice of RH refining furnace production IF steel, which comprises the following steps:
Step 1: molten steel arrives at a station after jacking, measures the inlet temperature of molten steel and the oxygen content that enters the station；
Step 2: cooling down according to the inlet temperature of measurement, decarbonizing process cooling, deoxidation process heating and alloying process, judgement
Whether molten steel needs to carry out temperature-compensating, and temperature offset；Vacuumize process is carried out to molten steel simultaneously；
Step 3: it is determined the need for carrying out oxygen blast processing according to temperature compensation value, the oxygen content that enters the station and the carbon content that enters the station, be determined
Blowing oxygen quantity；When vacuum degree reaches 100~150mbar, RH top gun oxygen blast is utilized；
Step 4: determining the amount of heating aluminum shot according to temperature compensation value, and after oxygen blast, heating aluminum shot is added in batches；
Step 5: after heating aluminum shot is added, vacuum degree≤1.0mbar is adjusted, promotes 160~180Nm of dip pipe gas flow3/
h；When CO content≤2% in RH refining furnace exhaust, decarburization terminates, while measuring oxygen content after decarburization；
Step 6: deoxidation aluminum shot and alloying aluminum shot are determined according to the content of dissolved aluminum in oxygen content after decarburization and target molten steel
Amount；Before aluminum shot addition, vacuum degree≤1.0mbar and 160~180Nm of gas flow is kept3/h；After 2min is added in aluminum shot,
Adjustment vacuum degree is 60~100mbar, 90~110Nm of lift gas flow3/h；Molten steel circulation time is 4min；
Step 7: alloy material is added to molten steel progress Alloying Treatment after recycling 4min in molten steel；
Step 8: after molten steel Alloying Treatment, adjustment vacuum degree is 60~100mbar, 90~110Nm of lift gas flow3/ h,
Molten steel recycles vacuum breaker after 6min in this case；
Step 9: Argon is stirred only after vacuum breaker, and 2 road argon gas, argon flow 25Nm is first set separately3/h；Argon gas is reduced after 10 seconds
Flow is slightly wriggled with the top of the slag, subject to molten steel is not exposed；Argon stirs the time only as 6min.
2. producing the temperature-compensating refinery practice of IF steel according to RH refining furnace described in claims 1, which is characterized in that the steel
Whether water needs to carry out the judgment method of temperature-compensating are as follows:
According to △ T=T0-(T1-T2+T3-T4)；
In formula, T0For outbound target temperature；T1For inlet temperature；T2Temperature is reduced for decarburization；T3Temperature is increased for aluminum shot deoxidation；T4
Temperature is reduced for alloying；
When T≤0 DEG C △, it is not required to carry out temperature-compensating, at this time T=0 DEG C of temperature compensation value；As 0 DEG C of △ T >, temperature benefit need to be carried out
It repays, at this time temperature compensation value T=△ T.
3. according to the temperature-compensating refinery practice of the RH refining furnace production IF steel of claims 1 or 2, which is characterized in that institute
State the judgment method whether molten steel needs to carry out oxygen blast processing are as follows:
According to △ Q=α × T- (Q1-Q2-Q0)；
In formula, T is temperature compensation value；Q0For decarburization target end oxygen content；Q1For the oxygen content that enters the station；Q2Oxygen is consumed for decarburization to contain
Amount；α is oxygen content needed for every 1 DEG C of the raising of molten steel, unit ppm；
When Q≤0 △；It is not required to carry out oxygen blast processing, blowing oxygen quantity is 0 at this time；As △ Q > 0, oxygen blast processing, at this time oxygen blast need to be carried out
Amount is V.
4. producing the temperature-compensating refinery practice of IF steel according to RH refining furnace described in claims 3, which is characterized in that described to blow
Oxygen amount V are as follows:
V=β × △ Q；
In formula, β is blowing oxygen quantity needed for the every increase 1ppm of Oxygen Content in Liquid Steel, unit Nm3。
5. producing the temperature-compensating refinery practice of IF steel according to RH refining furnace described in claims 2, which is characterized in that the liter
The amount M of warm aluminum shot are as follows:
M=γ × T；
In formula, T is temperature compensation value；γ is by liquid steel temperature 1 DEG C of addition aluminum shot amount of every raising, unit kg.
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| CN109182658B (en) * | 2018-09-26 | 2020-12-15 | 首钢集团有限公司 | RH refining control method and device |
| CN109852766B (en) * | 2018-12-05 | 2020-11-03 | 敬业钢铁有限公司 | Hydrogen and oxygen control process for RH furnace refining |
| CN109825674A (en) * | 2019-03-18 | 2019-05-31 | 武汉钢铁有限公司 | Conducive to the RH heating by O2 blowing method of IF steel Cleanliness of Molten Steel control |
| CN110527775B (en) * | 2019-09-29 | 2022-01-25 | 马鞍山钢铁股份有限公司 | RH refining furnace chemical temperature rising method suitable for low-carbon aluminum killed steel |
| CN110592324B (en) * | 2019-09-29 | 2021-12-28 | 马鞍山钢铁股份有限公司 | RH refining method for reducing tapping temperature of IF steel converter |
| CN110684883A (en) * | 2019-11-18 | 2020-01-14 | 马鞍山钢铁股份有限公司 | Steelmaking method for reducing tapping temperature of vacuum decarburization steel converter |
| CN114787394A (en) * | 2019-11-29 | 2022-07-22 | 杰富意钢铁株式会社 | Operating method for ladle refining treatment |
| CN111455136B (en) * | 2020-04-07 | 2022-08-02 | 马鞍山钢铁股份有限公司 | Method for improving energy utilization rate of carbon monoxide and hydrogen escaped from molten steel vacuum decarburization process |
| CN112646954B (en) * | 2020-11-23 | 2022-12-13 | 首钢集团有限公司 | RH refining method for improving removal rate of ultra-low carbon steel inclusions |
| CN113416816B (en) * | 2021-06-18 | 2022-04-05 | 马鞍山钢铁股份有限公司 | Method and model for determining oxygen blowing amount of IF steel smelted by RH refining furnace through two-step method |
| CN113655816B (en) * | 2021-06-30 | 2023-11-21 | 武汉钢铁有限公司 | Ladle bottom argon blowing system flow control method and computer readable storage medium |
| CN114262767B (en) * | 2021-12-03 | 2023-05-16 | 本钢板材股份有限公司 | RH furnace oxygen lance control method based on large forest algorithm |
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| CN100507018C (en) * | 2004-11-29 | 2009-07-01 | 宝山钢铁股份有限公司 | Method for determining oxygen blowing amount and cold material feeding amount in RH refining process |
| CN101928808A (en) * | 2009-06-22 | 2010-12-29 | 鞍钢股份有限公司 | Method for determining alloy addition amount in RH refining process |
| JP5464242B2 (en) * | 2012-08-20 | 2014-04-09 | 新日鐵住金株式会社 | Manufacturing method of clean steel |
| CN103305656B (en) * | 2013-03-27 | 2016-05-18 | 马钢(集团)控股有限公司 | A kind of IF steel RH vacuum decarburization course control method for use |
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