CN110438292A - A kind of method of molten steel nitrogen pick-up in process for making - Google Patents
A kind of method of molten steel nitrogen pick-up in process for making Download PDFInfo
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- CN110438292A CN110438292A CN201910718687.5A CN201910718687A CN110438292A CN 110438292 A CN110438292 A CN 110438292A CN 201910718687 A CN201910718687 A CN 201910718687A CN 110438292 A CN110438292 A CN 110438292A
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
Abstract
A kind of method of molten steel nitrogen pick-up in steel technique is provided, it before tapping the following steps are included: S1, start bottom blowing nitrogen, until persistently using ladle bottom blowing nitrogen to be stirred to molten steel after tapping and before ladle is outbound；Deoxidation and the adjustment of microalloy content are carried out to molten steel in S2, tapping process until after tapping by oxygen activity control in steel within 100ppm；S3, multiple nitrogen alloy wire is fed into ladle using feeding wire machine；S4, continuous casting is carried out to molten steel, obtains steel billet.By the nitrogen content in stability contorting molten steel, make niobium, vanadium, titanium and its alloy product have sufficient nitrogen in connection, second phase particles are precipitated sufficiently, improve steel yield strength, reduce niobium, vanadium, titanium and its alloy product usage amount, reduces cost of alloy.
Description
Technical field
The present invention relates generally to steelmaking technical field, more particularly to a kind of method of molten steel nitrogen pick-up in process for making.
Background technique
Nitrogen can be precipitated carefully in solidification with the operation of rolling in steel in conjunction with three kinds of niobium, vanadium, titanium microalloy elements
Small second phase particles hinder dislocation motion, realize the yield strength that steel are greatly improved under the conditions of low niobium, vanadium, titanium, use
Nitrogen, which strengthen to steel, has the characteristics that economic, environmental protection.
Steel industry, which mainly uses, at present is added composite nitride alloy (or similar product) or was refining in tapping process
Nitrogen pick-up is carried out to molten steel in the form of line feeding in journey, both the above method is respectively present the larger and high expensive of recovery rate fluctuation and asks
Topic.
Nitro-alloy is directly added into tapping process, due to molten steel oxygen activity higher (300-500ppm, peroxidating heat meeting
It is higher), cause the metallic element in alloy to aoxidize, while gas solubility is limited in molten steel, when steel oxygen content in water is higher, energy
The nitrogen enough dissolved is fewer, therefore nitrogen alloying is carried out in tapping process, and recovery rate is relatively low；Refining process, which carries out nitrogen alloying, to be had
Preferable recovery rate, but molten steel after entering refining furnace needs that additional slag making materials progress slag making and the heat preservation that is powered, heating is added,
Guarantee that molten steel is within the scope of reasonable temperature, causes increased costs.
Summary of the invention
The present invention provides molten steel in a kind of process for making for the low problem of nitrogen recovery rate in steel in the prior art
The method of nitrogen pick-up, this method force nitrogen pick-up to molten steel after converter tapping, make the nitrogen and micro- conjunction that have sufficient in steel
Gold element combines, and realizes that second phase particles are sufficiently precipitated under extremely low microalloy element content, obtains steel higher
Mechanical property has saved alloy consumption, reduces the cost of steel, solves converter procedure nitrogen pick-up recovery rate fluctuation problem and refining
Process nitrogen pick-up high expensive problem.
The technical scheme is that in a kind of process for making molten steel nitrogen pick-up method, this method use feeding wire machine, turn
After furnace is tapped and under conditions of molten steel oxygen activity≤100ppm, nitrogen pick-up is carried out to molten steel in a manner of the line feeding into ladle.
Further, the method for the present invention includes the following steps:
S1, start bottom blowing nitrogen before tapping, until persistently using ladle bottom blowing after tapping and before ladle is outbound
Nitrogen, to be stirred to molten steel；
Molten steel carries out deoxidation and the adjustment of microalloy content in S2, tapping process；
After S3, tapping and in steel when oxygen activity≤100ppm, multiple nitrogen alloy wire is fed into ladle using feeding wire machine；
S4, continuous casting is carried out to molten steel, obtains steel billet.
Further, the method process of above-mentioned steps S2 are as follows: when molten steel is tapped to the 1/5-1/3 of molten steel total volume,
Start to be used to adjust the deoxidier of molten steel oxygen activity and is used for the metal or alloy addition molten steel of microalloy content adjustment, and
When molten steel is tapped to 3/5~-the 2/3 of molten steel total volume, the deoxidier and metal or alloy for adjusting molten steel composition are added, out
Molten steel oxygen activity≤100ppm at the end of steel.
Further, the method process of above-mentioned steps S3 are as follows: after tapping, use wire-feeding velocity 0.1m/s-30m/s
Feeding wire machine, multiple nitrogen alloy wire or nitrogen pick-up core-spun yarn product are fed into molten steel.
Also further, above-mentioned deoxidier is simple substance or double deoxidizer, and the simple substance deoxidier includes pure aluminum；It is described
Double deoxidizer includes SiAlBaCa, AlMnCa, SiCaBa etc..
Further, the above-mentioned metal for the adjustment of microalloy content includes niobium, vanadium, titanium etc.；Alloy includes vanadium nitride
Other nitro-alloys such as iron, VN alloy, nitrided ferromanganese, ferro-silicon nitride.
Further, in above-mentioned steps S3, every furnace line feeding length is denoted as L, then the calculation method of L are as follows:
L=[(NTarget-NInitially)/(NCore powder×SRecovery rate)]×1000×mMolten steel/gCore powder；
Wherein NTargetFor molten steel target nitrogen content；
NInitiallyFor the original nitrogen content of molten steel；
NCore powderFor multiple nitrogen alloy wire or the core powder nitrogen content of nitrogen pick-up core-spun yarn；
SRecovery rateFor the recovery rate of nitrogen in multiple nitrogen alloy wire or nitrogen pick-up core-spun yarn；
mMolten steelFor the steel quality of tapping；
gCore powderFor core silty amount contained in every meter of multiple nitrogen alloy wire or nitrogen pick-up core-spun yarn.
Further, continuous casting in above-mentioned steps S4 method particularly includes: after ladle reaches conticaster, start to cast, it is intermediate
The control of tank molten steel overheat is at 15-50 DEG C, and the temperature of slab aligning is at 800 DEG C or more.Wherein the degree of superheat is molten steel actual temperature
Difference between liquidus curve.
Further, above-mentioned after the slab for obtaining the aquatic output of nitrogen-increasing steel, the side of hot sending or offline rear cold charge can be used
Formula is packed into heater for rolling steel.This step and step S4 are the relationships of substitution or selection, and two kinds of techniques can use, practical raw
Production is also all using, and essence is that slab is transported in heating furnace.
The method according to the invention step obtains the iron and inevitable impurity by element contained by technique requirement, surplus
And nitrogen content >=80ppm steel billet.
The prior art mainly adopts nitro-alloy is directly added into tapping process, due to the higher (300- of molten steel oxygen activity
500ppm, peroxidating heat can be higher), cause the metallic element in alloy to aoxidize, while gas solubility is limited in molten steel, when
Steel oxygen content in water is higher, and the nitrogen that can be dissolved is fewer, therefore nitrogen alloying is carried out in tapping process, and recovery rate is relatively low；Refining
Process, which carries out nitrogen alloying, has preferable recovery rate, but molten steel after entering refining furnace needs that additional slag making materials progress is added
Slag making and the heat preservation that is powered, heating, guarantee that molten steel is within the scope of reasonable temperature, cause increased costs.The method of the present invention overcomes
Nitrogen recovery rate in steel low problem in the prior art, Oxygen Content in Liquid Steel carry out line feeding nitrogen pick-up when being lower than 100ppm, and
In molten steel nitrogen pick-up simultaneously with addition of niobium, vanadium, titanium and its alloy product, second phase particles eduction rate is improved, vanadium or vanadium alloy system are reduced
Product usage amount saves cost of alloy.
The invention has the following advantages over the prior art:
(1) present invention controls oxygen content and microalloy content in tapping process, and is lower than 100ppm in Oxygen Content in Liquid Steel
Shi Caiyong line feeding mode nitrogen pick-up solves the problems, such as that nitrogen content is unstable in molten steel nitrogen-increasing steel.
(2) for the present invention by the way that Oxygen Content in Liquid Steel is lower than 100ppm as the opportunity of line feeding nitrogen pick-up, this is to stablize nitrogen to contain
The key for measuring recovery rate, solves the problems, such as that molten steel nitrogen increased amount is uncontrollable, by line feeding mode nitrogen pick-up, stability contorting nitrogen in steel contains
Amount.
(3) niobium, vanadium, titanium and nitrogen are added in steelmaking process and forms second phase particles by the present invention, because nitrogen in steel contains
The condition for measuring higher formation second phase particles is more abundant, and formation ratio is higher, and the intensity of raising is more, therefore the direct shadow of nitrogen content
Ring the dosage of niobium, vanadium, titanium and its alloy product.The present invention by the nitrogen content in stability contorting molten steel, make niobium, vanadium, titanium and its
Alloy product has sufficient nitrogen in connection, and second phase particles are precipitated sufficiently, improves steel yield strength, reduces
Niobium, vanadium, titanium and its alloy product usage amount reduce cost of alloy.
Detailed description of the invention
From the detailed description with reference to the accompanying drawing to the embodiment of the present invention, these and/or other aspects of the invention and
Advantage will become clearer and be easier to understand, in which:
Fig. 1 is that the practical N of finished steel that a kind of method of molten steel nitrogen pick-up in process for making in the embodiment of the present invention obtains contains
Measure distribution map.
Fig. 2 is that the practical vanadium of finished steel that a kind of method of molten steel nitrogen pick-up in process for making in the embodiment of the present invention obtains contains
Measure distribution map.
Fig. 3 is the practical mechanics of finished steel that a kind of method of molten steel nitrogen pick-up in process for making in the embodiment of the present invention obtains
Performance profile；
Fig. 4 be the finished steel that a kind of method of molten steel nitrogen pick-up in process for making in the embodiment of the present invention obtains ingredient,
Page is reported in gas, stretching and metal lographic examination；
Fig. 5 is 100 times of metallographs using present invention method steel produced；
Fig. 6 is 100 times of metallographs for not using this method steel produced.
Specific embodiment
In order to make those skilled in the art more fully understand the present invention, with reference to the accompanying drawings and detailed description to this hair
It is bright to be described in further detail.
Embodiment 1:
Molten steel increasing method for nitrogen in a kind of process for making, this method carry out molten steel by converter and just refine, carry out in tapping process complete
Journey bottom nitrogen blowing carries out deoxidation alloying to molten steel, ladle bottom blowing nitrogen is persistently carried out after tapping, using feeding wire machine to steel
Feed multiple nitrogen alloy wire or similar nitrogen pick-up core-spun yarn product in water, continuous casting carried out to molten steel, obtain by the contained element of technique requirements,
The iron of surplus and inevitable impurity and nitrogen content >=80ppm steel billet, the technique specifically comprise the following steps:
Step (1): molten steel is carried out using converter and is just refined；
Step (2): ladle carries out whole bottom blowing nitrogen, blowing nitrogen to ladle time >=5min after tapping when converter tapping；
Step (3): when tapping is to 1/5-1/3, simple substance deoxidier or double deoxidizer is added, pre-deoxidation is carried out to molten steel；Add
Enter metal or alloy adjustment molten steel composition；
Added when step (4) tapping is to 3/5-2/3 simple substance or double deoxidizer and metal for adjusting molten steel composition or
Alloy；
Step (5) line feeding amount length is according to formula [(the target nitrogen content-original nitrogen content of molten steel)/(multiple nitrogen alloy wire or increasing
The nitrogen content of nitrogen core-spun yarn × nitrogen actual recovery rate)] × 1000 × (tapping gross mass/every meter of line feeding quality)] it calculates
It determines；
Step (6) uses the feeding wire machine of wire-feeding velocity 0.1m/s-30m/s after tapping, multiple nitrogen is fed into molten steel and is closed
Gold thread or similar nitrogen pick-up core-spun yarn product；
Step (7) carries out continuous casting to molten steel；
Step (8) is obtained by element contained by technique requirement, the iron of surplus and inevitable impurity and nitrogen content >=80ppm
Steel billet.
Step (9) steel billet is directly heat-fed or offline cooling after be packed into heater for rolling steel, obtain finished steel.
Fig. 1 is the practical N content distribution map of finished steel obtained, it can be seen that obtained finished steel N content can be steady
Fixed control is in 80PPm or more；Fig. 2 is the practical content of vanadium distribution map of finished steel, it can be seen that steel content of vanadium can stablize drop
Down to 0.025% or less；Fig. 3 is the practical mechanics performance profile of finished steel obtained, it can be seen that under hot-rolled state,
Finished steel yield strength can stability contorting in 430MPa or more.
Fig. 4 is ingredient, gas, stretching and the metal lographic examination report page of the finished steel obtained；Fig. 5 is using this method institute
100 times of metallographs of the steel of production, Fig. 6 are 100 times of metallographs for not using this method steel mill produced, pass through photograph
Piece compares, and the metallographic structure of steel is substantially better than metallographic structure in Fig. 6 from grain size number to crystal grain uniformity coefficient in Fig. 5.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.Therefore, protection scope of the present invention is answered
This is subject to the protection scope in claims.
Claims (9)
1. a kind of method of molten steel nitrogen pick-up in process for making, which is characterized in that this method uses feeding wire machine, terminates in converter tapping
Afterwards and when molten steel oxygen activity≤100ppm, nitrogen pick-up is carried out to molten steel in a manner of the line feeding into ladle.
2. the method for molten steel nitrogen pick-up in process for making as described in claim 1, which is characterized in that it the following steps are included:
S1, start bottom blowing nitrogen before tapping, until persistently using ladle bottom blowing nitrogen after tapping and before ladle is outbound
To be stirred to molten steel；
Deoxidation is carried out to molten steel in S2, tapping process and microalloy content adjusts；
S3, after tapping and in steel when oxygen activity activity≤100ppm, multiple nitrogen alloy is fed into ladle using feeding wire machine
Line；
S4, continuous casting is carried out to molten steel, obtains steel billet.
3. the method for molten steel nitrogen pick-up in process for making according to claim 1, which is characterized in that the method for the step S2
Process are as follows: when molten steel is tapped to the 1/5~1/3 of total volume, start to be used to adjust the deoxidier of molten steel oxygen activity and be used for
Molten steel is added in the metal or alloy of microalloy content adjustment, and when molten steel is tapped to the 3/5~2/3 of total volume, adds and be used for
Adjust the deoxidier of molten steel composition and the metal or alloy for adjusting microalloy content.
4. the method for molten steel nitrogen pick-up in process for making according to claim 2, which is characterized in that the method for the step S3
Process are as follows: after tapping and when molten steel oxygen activity≤100ppm, using the feeding wire machine of wire-feeding velocity 0.1m/s~30m/s, to
Multiple nitrogen alloy wire or nitrogen pick-up core-spun yarn product are fed in molten steel.
5. the method for molten steel nitrogen pick-up in process for making according to claim 2, which is characterized in that the deoxidier is simple substance
Or double deoxidizer, the simple substance deoxidier includes aluminum steel；The double deoxidizer includes SiAlBaCa, AlMnCa, SiCaBa
One of or it is a variety of.
6. the method for molten steel nitrogen pick-up in process for making according to claim 3, which is characterized in that described to contain for microalloy
The metal of amount adjustment includes niobium, vanadium, titanium；Alloy includes one of ferrovanadium nitride, VN alloy, nitrided ferromanganese, ferro-silicon nitride
Or it is a variety of.
7. the method for molten steel nitrogen pick-up in process for making according to claim 2, which is characterized in that in the step S3, often
Furnace line feeding length is denoted as L, then the calculation method of L are as follows:
L=[(NTarget-NInitially)/(NCore powder×SRecovery rate)]×1000×mMolten steel/gCore powder；
Wherein NTargetFor molten steel target nitrogen content；
NInitiallyFor the original nitrogen content of molten steel；
NCore powderFor multiple nitrogen alloy wire or the core powder nitrogen content of nitrogen pick-up core-spun yarn；
SRecovery rateFor the recovery rate of nitrogen in multiple nitrogen alloy wire or nitrogen pick-up core-spun yarn；
mMolten steelFor the steel quality of tapping；
gCore powderFor core silty amount contained in every meter of multiple nitrogen alloy wire or nitrogen pick-up core-spun yarn.
8. the method for molten steel nitrogen pick-up in process for making according to claim 2, which is characterized in that continuous casting in the step S4
Method particularly includes: after ladle reaches conticaster, start to cast, the control of pans molten steel overheat at 15~50 DEG C, rectify by slab
Straight temperature is at 800 DEG C or more.
9. the method for molten steel nitrogen pick-up in process for making according to claim 2, which is characterized in that wherein, obtaining nitrogen pick-up
After the slab that molten steel is produced, heater for rolling steel is packed by the way of hot sending or offline rear cold charge.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111607679A (en) * | 2020-07-14 | 2020-09-01 | 广东韶钢松山股份有限公司 | Method for accurately increasing nitrogen of vanadium-containing steel and preparation method of vanadium-containing steel |
| CN111748669A (en) * | 2020-06-22 | 2020-10-09 | 九江萍钢钢铁有限公司 | Nitrogen increasing method for hot-rolled ribbed steel bar |
| CN112359171A (en) * | 2020-11-09 | 2021-02-12 | 李彩云 | Method for titanium-nitrogen alloying of molten steel in steelmaking process |
| CN113564478A (en) * | 2021-07-29 | 2021-10-29 | 三鑫重工机械有限公司 | In-situ regeneration titanium nitride graphite semisteel-based steel billet continuous roller and preparation method thereof |
| CN113564477A (en) * | 2021-07-29 | 2021-10-29 | 三鑫重工机械有限公司 | In-situ regeneration titanium nitride steel base BD roller |
| CN113604726A (en) * | 2021-07-29 | 2021-11-05 | 三鑫重工机械有限公司 | Preparation method of in-situ regeneration titanium nitride steel-based roller |
| CN113621879A (en) * | 2021-07-29 | 2021-11-09 | 三鑫重工机械有限公司 | In-situ regeneration titanium nitride graphite semisteel-based section steel roller and roller ring and preparation method thereof |
| CN116694851A (en) * | 2023-05-26 | 2023-09-05 | 福建三宝钢铁有限公司 | High-nitrogen process method for deformed steel bar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111748669A (en) * | 2020-06-22 | 2020-10-09 | 九江萍钢钢铁有限公司 | Nitrogen increasing method for hot-rolled ribbed steel bar |
| CN111607679A (en) * | 2020-07-14 | 2020-09-01 | 广东韶钢松山股份有限公司 | Method for accurately increasing nitrogen of vanadium-containing steel and preparation method of vanadium-containing steel |
| CN112359171A (en) * | 2020-11-09 | 2021-02-12 | 李彩云 | Method for titanium-nitrogen alloying of molten steel in steelmaking process |
| CN113564478A (en) * | 2021-07-29 | 2021-10-29 | 三鑫重工机械有限公司 | In-situ regeneration titanium nitride graphite semisteel-based steel billet continuous roller and preparation method thereof |
| CN113564477A (en) * | 2021-07-29 | 2021-10-29 | 三鑫重工机械有限公司 | In-situ regeneration titanium nitride steel base BD roller |
| CN113604726A (en) * | 2021-07-29 | 2021-11-05 | 三鑫重工机械有限公司 | Preparation method of in-situ regeneration titanium nitride steel-based roller |
| CN113621879A (en) * | 2021-07-29 | 2021-11-09 | 三鑫重工机械有限公司 | In-situ regeneration titanium nitride graphite semisteel-based section steel roller and roller ring and preparation method thereof |
| CN116694851A (en) * | 2023-05-26 | 2023-09-05 | 福建三宝钢铁有限公司 | High-nitrogen process method for deformed steel bar |
| CN116694851B (en) * | 2023-05-26 | 2024-04-05 | 福建三宝钢铁有限公司 | High-nitrogen process method for deformed steel bar |
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