CN104673971A - Method for increasing nitrogen content in vanadium-containing steel bar - Google Patents
Method for increasing nitrogen content in vanadium-containing steel bar Download PDFInfo
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- CN104673971A CN104673971A CN201510060395.9A CN201510060395A CN104673971A CN 104673971 A CN104673971 A CN 104673971A CN 201510060395 A CN201510060395 A CN 201510060395A CN 104673971 A CN104673971 A CN 104673971A
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Abstract
The invention discloses a method for increasing the nitrogen content in a vanadium-containing steel bar. The method comprises the following steps: performing ladle bottom nitrogen blowing stirring in the converter tapping process, adding a deoxidant in the steel ladle in the tapping process to control the oxygen activity of the molten steel to below 30 ppm, and adding the converter vanadium-containing slag to perform vanadium alloying so that the nitrogen content of the molten steel is 70-90 ppm before LF refining; in the LF converter refining process, adding ferrovanadium nitride to adjust the vanadium content in the molten steel, simultaneously stirring the molten steel by adopting the ladle bottom nitrogen blowing to substitute the bottom argon blowing to finally control the nitrogen content in the molten steel to 130-220 ppm. The nitrogen content is increased in the converter tapping-LF refining process so that the nitrogen content in the steel is controlled to 130-220 ppm; the vanadium alloying is performed by the converter vanadium-containing slag so that separation out of vanadium nitride from the steel is promoted. The steel performance is obviously increased, the alloy adding amount is reduced and simultaneously the production cost of the vanadium-containing steel bar is reduced.
Description
Technical field
The present invention relates to steelmaking technical field, especially a kind of method increasing nitrogen content in V-alloyed steel muscle.
Background technology
Nitrogen element is all regarded as harmful element in most of steel grade, the existence of nitrogen in steel reduces toughness and the plasticity of steel, make steel produce strain aging, aging precipitation sclerosis or aged brittleness, cause the blue shortness of steel, cold short, on the mechanical property of steel, there is significant impact.But for V-alloyed steel muscle, nitrogen and vanadium have stronger avidity, and vanadium not only forms VN and suppresses the disadvantageous effect of nitrogen, and nitrogen is utilized to make precipitin reaction optimizing.Increase the nitrogen content in V-alloyed steel, ferritic degree of supersaturation can be improved and impel V(C, N) particle raw core faster, give full play to grain refining and precipitation strength effect, played the combination of strength and toughness improving steel, significantly improve the effect of steel performance.For this reason, when V-alloyed steel muscle is produced, take measures to improve nitrogen in steel content, not only can improve steel and improve steel performance, and V-alloyed steel muscle production cost can be reduced.
Publication number is that the Chinese patent of CN101168817A discloses " a kind of increasing method for nitrogen of nitrogenous Clean Steel ", the feature of the method is secondary refining latter stage, molten steel nitrogen pick-up is carried out by ladle bottom blowing nitrogen, carry out molten steel cleaning by argon bottom-blowing after nitrogen flushing terminates, reached molten steel nitrogen pick-up and improved the object of purity.The method to carry out separately ladle bottom blowing N Gas Alloying latter stage and argon bottom-blowing cleaning removal is mingled with at secondary refining, and treatment time fluctuation is comparatively large, is unfavorable for the stability of producing, and affect continuous casting production.
Publication number is that the Chinese patent of CN101538636A discloses " ladle furnace use nitrogen gas nitrogen alloying process ", the feature of the method is that nitrogen-contained stainless steel is after smelting terminates, under steel hammer composition reaches the prerequisite of target component, in furnaceman LF position by ladle bottom blowing nitrogen gas nitrogen alloying, alternative nitro-alloy reaches the object of molten steel nitrogen pick-up.The shortcoming of the method is that the treatment time is longer, and treating processes ladle bottom blowing nitrogen flow is comparatively large, and the fluctuation of nitrogen in steel content is comparatively large, affects production stability.
Publication number is that the Chinese patent of CN102851451A discloses " a kind of method of operation molten steel nitrogen pick-up of tapping ", by carrying out nitrogen flushing operation with tapping process to ladle before converter tapping, to make molten steel nitrogen content before refining reach between 80 ~ 90ppm, and obtain by refining treatment the molten steel that nitrogen content is less than 150ppm.The shortcoming of the method is by means of only tapping process nitrogen blowing, because the bottom blowing time is short, is difficult to realize nitrogen content in molten steel and reaches between 80 ~ 90ppm before refining.
Publication number is that the Chinese patent of CN103451350A discloses " a kind of method controlling nitrogen content in molten steel ", to make in molten steel Control of Nitrogen Content between 100 ~ 230ppm by converter steelmaking process nitrogen pick-up and tapping process nitrogen pick-up.The shortcoming of the method is that requirement tapping process adds reductor and makes molten steel oxygen activity in ladle reach below 10ppm, reductor add-on is larger, production cost is higher, the nitrogenous steel being only applicable to require oxygen level lower is produced, simultaneously, nitrogen in steel content controls between 100 ~ 230ppm, and nitrogen content fluctuation is larger.
Summary of the invention
The invention provides a kind of method increasing nitrogen content in V-alloyed steel muscle, nitrogen in steel content is made to control between 130 ~ 220ppm by the nitrogen pick-up of converter tapping-LF refining process, converter vanadium containing slag is used to carry out vanadium alloying, thus facilitate the precipitation of nitrogen in steel vanadium, improve steel performance significantly, reduce alloy addition simultaneously, achieve the object reducing V-alloyed steel muscle production cost.
The technical solution used in the present invention is:
A kind of method increasing nitrogen content in V-alloyed steel muscle, ladle bottom blowing nitrogen gas stirring is carried out in converter tapping process, and in tapping process, in ladle, add reductor make molten steel oxygen activity control at below 30ppm, add converter vanadium containing slag simultaneously and carry out vanadium alloying, increase ladle bottom blowing nitrogen intensity, make nitrogen content of molten steel before LF refining reach 70 ~ 90ppm; Described reductor is Si-Al-Ba alloy, aluminium manganese calcium magnesium or aluminium manganese calcium iron;
In LF stove refining process, add ferrovanadium nitride and content of vanadium in molten steel adjusted, adopt ladle bottom blowing nitrogen to replace argon bottom-blowing to carry out agitation of molten steel simultaneously, promote molten steel nitrogen pick-up, the most at last in molten steel Control of Nitrogen Content between 130 ~ 220ppm.
In described converter tapping process, bottom blowing nitrogen flow controls at 0.5 ~ 0.8 m
3between/min.
In described converter tapping process, vanadium containing slag add-on is 400-1000kg.
In described LF stove refining process, during agitation of molten steel, Bottom Blowing Flow Rate Control is at 0.5 ~ 0.8 m
3between/min, during molten steel heating, Bottom Blowing Flow Rate Control is at 0.15 ~ 0.22 m
3between/min.
The present invention uses converter vanadium containing slag to carry out vanadium alloying, thus facilitates the precipitation of nitrogen in steel vanadium, improving steel significantly and improves steel performance, reducing alloy addition when ensureing reinforcement property.
In LF stove refining process, according to content of vanadium in molten steel, add ferrovanadium nitride and carry out molten steel vanadium trimming, it is made to reach target content of vanadium, adopt ladle bottom blowing nitrogen to replace argon bottom-blowing to carry out agitation of molten steel simultaneously, promote molten steel nitrogen pick-up, the most at last in molten steel Control of Nitrogen Content between 130 ~ 220ppm.
Meanwhile, to strictly control the ladle refining time in LF stove refining process, make same specification steel grade refining time deviation control within 10min, reduce the fluctuation of nitrogen content in molten steel.
The refining of LF stove adopts bottom blowing nitrogen to replace argon bottom-blowing to carry out stirring and nitrogen pick-up, not only reduces alloy addition when ensureing reinforcement property, and significantly reduces bottom blown gas cost, achieve the object reducing V-alloyed steel muscle production cost.
The beneficial effect adopting technique scheme to produce is:
The present invention makes nitrogen in steel content control between 130 ~ 220ppm by the nitrogen pick-up of converter tapping-LF refining process, converter vanadium containing slag is used to carry out vanadium alloying, thus facilitate the precipitation of nitrogen in steel vanadium, improve steel performance significantly, reduce alloy addition simultaneously, achieve the object reducing V-alloyed steel muscle production cost.
Replace argon bottom-blowing to carry out stirring and nitrogen pick-up by bottom blowing nitrogen, significantly reduce bottom blown gas cost, reduce V-alloyed steel muscle production cost further.
Embodiment
Below by way of specific examples, the present invention is described further.
Example of the present invention carries out in 100t converter tapping and LF stove refining process.Converter tapping process adds aluminium base reductor and carries out deoxidation, adds vanadium slag and carries out vanadium alloying, and LF stove refining process is added ferrovanadium nitride and finely tuned vanadium composition in steel, carries out bottom blowing nitrogen carry out stirring and nitrogen pick-up at 100t converter tapping-LF stove refining process.As follows:
Embodiment 1
Converter tapping process Ladle Bottom nitrogen flushing flow is 0.5m
3/ min, tapping adds Si-Al-Ba alloy deoxidation, and tapping temperature is 1680 DEG C, and vanadium slag add-on is 456kg, and it is 28ppm that deoxidation terminates rear molten steel oxygen activity, and obtaining nitrogen content in liquid steel at stove rear platform is 83.0ppm.
In LF stove refining process, according to refining molten steel vanadium content in early stage, add ferrovanadium nitride and vanadium in molten steel is adjusted to steel grade requirement, during molten steel heating, ladle bottom blowing nitrogen flow is 0.2 m
3/ min, heat-up time is 12min, and during agitation of molten steel, Ladle Bottom nitrogen flushing flow is 0.6m
3/ min, refining time is 23min, finally obtains the molten steel that nitrogen content is 179.2ppm, obtains final steel water constituent as shown in table 1.
Table 1 embodiment 1 molten steel composition (wt %)
Embodiment 2
Converter tapping process Ladle Bottom nitrogen flushing flow is 0.6m
3/ min, tapping adds Si-Al-Ba alloy deoxidation, and tapping temperature is 1649 DEG C, and vanadium slag add-on is 430kg, and it is 23.3ppm that deoxidation terminates rear molten steel oxygen activity, and obtaining nitrogen content in liquid steel at stove rear platform is 80.6ppm.
In LF stove refining process, according to refining molten steel vanadium content in early stage, add ferrovanadium nitride and vanadium in molten steel is adjusted to steel grade requirement, during molten steel heating, ladle bottom blowing nitrogen flow is 0.15 m
3/ min, heat-up time is 13min, and during agitation of molten steel, Ladle Bottom nitrogen flushing flow is 0.5m
3/ min, refining time is 29min, finally obtains the molten steel that nitrogen content is 158.1ppm, obtains final steel water constituent as shown in table 2.
Table 2 embodiment 2 molten steel composition (wt %)
Embodiment 3
Converter tapping process Ladle Bottom nitrogen flushing flow is 0.65m
3/ min, tapping adds the deoxidation of aluminium manganese calcium iron, and tapping temperature is 1679 DEG C, and vanadium slag add-on is 414kg, and it is 28ppm that deoxidation terminates rear molten steel oxygen activity, and obtaining nitrogen content in liquid steel at stove rear platform is 90.0ppm.
In LF stove refining process, according to refining molten steel vanadium content in early stage, add ferrovanadium nitride and vanadium in molten steel is adjusted to steel grade requirement, during molten steel heating, ladle bottom blowing nitrogen flow is 0.21 m
3/ min, heat-up time is 9min, and during agitation of molten steel, Ladle Bottom nitrogen flushing flow is 0.6m
3/ min, refining time is 25min, finally obtains the molten steel that nitrogen content is 198.75ppm.Obtain final steel water constituent as shown in table 3.
Table 3 embodiment 3 molten steel composition (wt %)
Embodiment 4
Converter tapping process Ladle Bottom nitrogen flushing flow is 0.8m
3/ min, tapping adds the deoxidation of aluminium manganese calcium iron, and tapping temperature is 1659 DEG C, and vanadium slag add-on is 400kg, and it is 25ppm that deoxidation terminates rear molten steel oxygen activity, and obtaining nitrogen content in liquid steel at stove rear platform is 70.0ppm.
In LF stove refining process, according to refining molten steel vanadium content in early stage, add ferrovanadium nitride and vanadium in molten steel is adjusted to steel grade requirement, during molten steel heating, ladle bottom blowing nitrogen flow is 0.22 m
3/ min, heat-up time is 9min, and during agitation of molten steel, Ladle Bottom nitrogen flushing flow is 0.8m
3/ min, refining time is 25min, finally obtains the molten steel that nitrogen content is 220ppm.Obtain final steel water constituent as shown in table 5.
Table 4 embodiment 4 molten steel composition (wt %)
Embodiment 5
Converter tapping process Ladle Bottom nitrogen flushing flow is 0.7m
3/ min, tapping adds the deoxidation of aluminium manganese calcium magnesium, and tapping temperature is 1665 DEG C, and vanadium slag add-on is 1000kg, and it is 21ppm that deoxidation terminates rear molten steel oxygen activity, and obtaining nitrogen content in liquid steel at stove rear platform is 70.0ppm.
In LF stove refining process, according to refining molten steel vanadium content in early stage, add ferrovanadium nitride and vanadium in molten steel is adjusted to steel grade requirement, during molten steel heating, ladle bottom blowing nitrogen flow is 0.15 m
3/ min, heat-up time is 9min, and during agitation of molten steel, Ladle Bottom nitrogen flushing flow is 0.5m
3/ min, refining time is 25min, finally obtains the molten steel that nitrogen content is 130ppm.Obtain final steel water constituent as shown in table 5.
Table 5 embodiment 5 molten steel composition (wt %)
Claims (4)
1. one kind increases the method for nitrogen content in V-alloyed steel muscle, it is characterized in that: in converter tapping process, carry out ladle bottom blowing nitrogen gas stirring, and in tapping process, in ladle, add reductor make molten steel oxygen activity control at below 30ppm, add converter vanadium containing slag simultaneously and carry out vanadium alloying, increase ladle bottom blowing nitrogen intensity, make nitrogen content of molten steel before LF refining reach 70 ~ 90ppm; Described reductor is Si-Al-Ba alloy, aluminium manganese calcium magnesium or aluminium manganese calcium iron;
In LF stove refining process, add ferrovanadium nitride and content of vanadium in molten steel adjusted, adopt ladle bottom blowing nitrogen to replace argon bottom-blowing to carry out agitation of molten steel simultaneously, promote molten steel nitrogen pick-up, the most at last in molten steel Control of Nitrogen Content between 130 ~ 220ppm.
2. a kind of method increasing nitrogen content in V-alloyed steel muscle according to claim 1, is characterized in that in described converter tapping process, bottom blowing nitrogen flow controls at 0.5 ~ 0.8 m
3between/min.
3. a kind of method increasing nitrogen content in V-alloyed steel muscle according to claim 1, is characterized in that in described converter tapping process, vanadium containing slag add-on is 400-1000kg.
4. a kind of method increasing nitrogen content in V-alloyed steel muscle according to claim 1, is characterized in that in described LF stove refining process, during agitation of molten steel, Bottom Blowing Flow Rate Control is at 0.5 ~ 0.8 m
3between/min, during molten steel heating, Bottom Blowing Flow Rate Control is at 0.15 ~ 0.22 m
3between/min.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108193011A (en) * | 2017-12-29 | 2018-06-22 | 攀钢集团攀枝花钢钒有限公司 | The method that the converter smelting of half steel containing vanadium carries out vanadium alloying using vanadium slag |
| CN109355548A (en) * | 2018-10-25 | 2019-02-19 | 舞阳钢铁有限责任公司 | A kind of smelting process of 630MPa grades of nitrogenous high-strength steel |
| CN111020105A (en) * | 2019-12-12 | 2020-04-17 | 河钢股份有限公司承德分公司 | Utilization method of vanadium-containing iron block |
| 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 |
| CN111926140A (en) * | 2020-07-30 | 2020-11-13 | 中天钢铁集团有限公司 | Nitrogen control method for steel for high-performance CVT gearbox gear |
| CN113337679A (en) * | 2021-06-21 | 2021-09-03 | 重庆钢铁股份有限公司 | Method for increasing nitrogen content in steel |
| CN113462852A (en) * | 2021-07-01 | 2021-10-01 | 攀钢集团攀枝花钢钒有限公司 | Method for alloying vanadium in semisteel slag |
| CN113817950A (en) * | 2021-07-15 | 2021-12-21 | 新疆八一钢铁股份有限公司 | Method for stably controlling nitrogen in LF furnace by using nitrogen |
| CN114000040A (en) * | 2021-11-19 | 2022-02-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Production method for improving nitrogen content in vanadium microalloyed deformed steel bar |
| CN115261561A (en) * | 2022-08-03 | 2022-11-01 | 山东钢铁股份有限公司 | Molten steel vanadium-nitrogen microalloying method |
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| CN108193011A (en) * | 2017-12-29 | 2018-06-22 | 攀钢集团攀枝花钢钒有限公司 | The method that the converter smelting of half steel containing vanadium carries out vanadium alloying using vanadium slag |
| CN109355548A (en) * | 2018-10-25 | 2019-02-19 | 舞阳钢铁有限责任公司 | A kind of smelting process of 630MPa grades of nitrogenous high-strength steel |
| CN111020105A (en) * | 2019-12-12 | 2020-04-17 | 河钢股份有限公司承德分公司 | Utilization method of vanadium-containing iron block |
| 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 |
| CN111926140A (en) * | 2020-07-30 | 2020-11-13 | 中天钢铁集团有限公司 | Nitrogen control method for steel for high-performance CVT gearbox gear |
| CN111926140B (en) * | 2020-07-30 | 2022-04-05 | 中天钢铁集团有限公司 | Nitrogen control method for steel for high-performance CVT gearbox gear |
| CN113337679A (en) * | 2021-06-21 | 2021-09-03 | 重庆钢铁股份有限公司 | Method for increasing nitrogen content in steel |
| CN113462852A (en) * | 2021-07-01 | 2021-10-01 | 攀钢集团攀枝花钢钒有限公司 | Method for alloying vanadium in semisteel slag |
| CN113817950A (en) * | 2021-07-15 | 2021-12-21 | 新疆八一钢铁股份有限公司 | Method for stably controlling nitrogen in LF furnace by using nitrogen |
| CN114000040A (en) * | 2021-11-19 | 2022-02-01 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Production method for improving nitrogen content in vanadium microalloyed deformed steel bar |
| CN115261561A (en) * | 2022-08-03 | 2022-11-01 | 山东钢铁股份有限公司 | Molten steel vanadium-nitrogen microalloying method |
| CN115261561B (en) * | 2022-08-03 | 2024-03-01 | 山东钢铁股份有限公司 | Molten steel vanadium-nitrogen microalloying method |
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