CN115261712B - Composite vanadium-nitrogen alloy, manufacturing process and application method thereof - Google Patents
Composite vanadium-nitrogen alloy, manufacturing process and application method thereof Download PDFInfo
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- CN115261712B CN115261712B CN202210927536.2A CN202210927536A CN115261712B CN 115261712 B CN115261712 B CN 115261712B CN 202210927536 A CN202210927536 A CN 202210927536A CN 115261712 B CN115261712 B CN 115261712B
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- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 title claims abstract description 212
- 229910001199 N alloy Inorganic materials 0.000 title claims abstract description 195
- 239000002131 composite material Substances 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 195
- 239000010959 steel Substances 0.000 claims abstract description 195
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 194
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 105
- 238000003723 Smelting Methods 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- 238000010079 rubber tapping Methods 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 15
- 239000011230 binding agent Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000009628 steelmaking Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 238000011049 filling Methods 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229910000600 Ba alloy Inorganic materials 0.000 claims description 2
- 229910000882 Ca alloy Inorganic materials 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 claims description 2
- 125000004433 nitrogen atom Chemical group N* 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 description 33
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 32
- 230000000052 comparative effect Effects 0.000 description 22
- 238000011084 recovery Methods 0.000 description 22
- 239000012298 atmosphere Substances 0.000 description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 229910052760 oxygen Inorganic materials 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 14
- 230000001965 increasing effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 125000004429 atom Chemical group 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000009472 formulation Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005121 nitriding Methods 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
-
- 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
-
- 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
-
- 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
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/20—Obtaining niobium, tantalum or vanadium
- C22B34/22—Obtaining vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/02—Alloys based on vanadium, niobium, or tantalum
- C22C27/025—Alloys based on vanadium, niobium, or tantalum alloys based on vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/006—Making ferrous alloys compositions used for making ferrous alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/20—Recycling
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- General Life Sciences & Earth Sciences (AREA)
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a composite vanadium-nitrogen alloy, wherein the surface of the composite vanadium-nitrogen alloy is coated with a deoxidizer layer, so that the deoxidizer is uniformly diffused in molten steel, and the transmission speed of nitrogen into the molten steel is improved. The application also provides a use method of the composite vanadium-nitrogen alloy, which specifically comprises the following steps: adopting a mode of centralized addition or batch addition according to the total addition amount of the composite vanadium-nitrogen alloy; controlling the temperature of molten steel at the smelting end point of the converter to be 1640-1660 ℃; the carbon content of the smelting end point of the converter is controlled to be 0.08-0.20%, so that the problems of local supersaturation of nitrogen atom concentration in molten steel and too slow transfer speed of nitrogen in the composite vanadium-nitrogen alloy to the molten steel are solved.
Description
Technical Field
The invention relates to a composite vanadium-nitrogen alloy, a manufacturing process and a using method thereof, and belongs to the technical field of alloys in steelmaking process.
Background
The vanadium-nitrogen alloy is widely applied to the field of steel making, is used for improving the content of V, N element in molten steel, is separated out in the form of VN in the subsequent steel rolling or cooling process, and can greatly improve the strength of steel. According to production practice, under the condition that the N content is sufficient, every 0.01% of V in the mass fraction of the steel components can improve the yield strength of the steel by 25-30 Mpa, and under the condition that the N content is insufficient, every 0.01% of V can only improve the yield strength of the steel by 15-20 Mpa, because the precipitation strengthening effect of VN on the steel is obviously better than that of VC on the steel.
However, at present, the domestic steel mill generally adds vanadium-nitrogen alloy containing 77% of vanadium and 15% of nitrogen into molten steel, the adding method is that the vanadium-nitrogen alloy is intensively added along with the steel flow at one time in the early stage of converter tapping, but the problem of unstable nitrogen recovery rate in the composite vanadium-nitrogen alloy exists, only about 30-60% of nitrogen in the vanadium-nitrogen alloy can be reserved in the molten steel, and other nitrogen elements are diffused into the atmosphere in the form of nitrogen.
For example, chinese patent CN104673971a discloses a method for increasing nitrogen content in vanadium-containing steel bar, in which ladle bottom blowing nitrogen is performed during tapping of converter, and deoxidizer is added into ladle during tapping to control oxygen activity of molten steel below 30ppm, meanwhile, converter vanadium-containing slag is added to perform vanadium alloying, so as to increase strength of ladle bottom blowing nitrogen, and make nitrogen content of molten steel reach 70-90 ppm before LF refining. However, since the deoxidizer cannot be uniformly diffused in the molten steel, there is unevenness in deoxidization, and thus there are problems in that the nitrogen content of the molten steel is unstable and the nitrogen content is low.
From the above, the existing vanadium-nitrogen alloy and the use method thereof have the problems of low nitrogen content recovery rate, unstable nitrogen content and the like, so that the strengthening effect of V cannot be fully exerted, the performance of steel is low and unstable, and the vanadium-nitrogen alloy is also a waste of vanadium resources.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a composite vanadium-nitrogen alloy, a manufacturing process and a using method thereof, so as to solve the problems of low nitrogen content recovery rate, instability and the like, and the method mainly comprises the following steps:
the first part, the invention provides a composite vanadium-nitrogen alloy, comprising: vanadium-nitrogen alloy and deoxidizer layer.
The deoxidizer layer is coated on the surface of the vanadium-nitrogen alloy.
The thickness of the deoxidizer layer is 2-4 mm, the deoxidizer layer contains deoxidizer and binder, and the mass ratio of the deoxidizer to the binder is (98-99.5): (0.5-2), and the weight of the deoxidizer layer accounts for 30-60% of the total weight of the composite vanadium-nitrogen alloy.
The deoxidizer is one or a combination of a plurality of Al, ca and Ba alloys.
The binder comprises: water glass and phenolic resin.
The vanadium-nitrogen alloy is produced by the prior art, and the content range of the components is V: 75-78%, N: 14-18%, C1-5% and Fe 0.5-5%.
Under the condition that the target control value of the V component is 0.04%, the nitrogen content in the molten steel is more than 97ppm by adopting the composite vanadium-nitrogen alloy provided by the application.
[ O ] in molten Steel]Is a surface active atom which is easy to adsorb on the surface of molten steel, thus [ O ]]Atomic energy and [ N ]]Atoms compete for active sites on the surface of molten steel, and oxygen [ O ] is dissolved in molten steel]Influence of the content [ N ]]The adsorption of atoms on the surface of molten steel has decisive influence on the nitrogen absorption process, and oxygen [ O ] is dissolved in the molten steel]The content can obviously influence the transmission speed of nitrogen in the composite vanadium-nitrogen alloy into molten steel; dissolved oxygen [ O ] in molten steel]The higher the content is, the activity [ O ] of the molten steel surface]The more is left to [ N ]]The active point of atoms is reduced, and [ N ] in the vanadium-nitrogen alloy]The slower the transfer rate into the molten steel, the faster the transfer into the molten steel [ N ]]Will be N 2 In the form of (2) escaping into the atmosphere, resulting in [ N ] in the vanadium-nitrogen alloy]The element recovery rate is reduced; dissolved oxygen [ O ] in molten steel]The content is approximately inversely proportional to the transmission speed of nitrogen in the vanadium-nitrogen alloy to molten steel. After the composite vanadium-nitrogen alloy with the deoxidizer layer on the surface is added into molten steel, the deoxidizer layer is melted at the temperature of the molten steel, so as to reduce the dissolved oxygen (O) in the molten steel]The content of the N element in the composite vanadium-nitrogen alloy is lower than that of the N element in the molten steel around the vanadium-nitrogen alloy, so that the N element in the composite vanadium-nitrogen alloy can be quickly diffused into the molten steel, the diffusion of nitrogen in the composite vanadium-nitrogen alloy into the atmosphere caused by poor nitrogen absorption capacity of the molten steel is reduced, and the recovery rate of the nitrogen element in the composite vanadium-nitrogen alloy is improved.
The second part, the application provides a manufacturing process of the composite vanadium-nitrogen alloy, which comprises the following steps:
crushing the deoxidizer and the binder, uniformly mixing to obtain deoxidized materials, and pressing the deoxidized materials to the surface of the vanadium-nitrogen alloy ball by using a ball pressing machine.
The granularity of the deoxidizer and the binder after being crushed is less than or equal to 2mm.
Preferably, the pressing process is as follows:
s1, pressing deoxidized materials into a hollow hemisphere by using a die, wherein the hollow part of the hollow hemisphere is matched with vanadium-nitrogen alloy;
s2, filling vanadium-nitrogen alloy into the hollow part of the hollow hemisphere, pressing the other hollow hemisphere with the vanadium-nitrogen alloy into a complete ball,
s3, drying the complete spherical objects at the temperature of 100-200 ℃ for 4-5 hours.
The production process of the vanadium-nitrogen alloy ball comprises the following steps: uniformly stirring and mixing vanadium-containing raw material powder, ferric oxide powder, a carbonaceous reducing agent and a binder, briquetting, forming into a sphere or a rugby ball shape, then sending into a calcining kiln for preheating and drying, wherein the treatment temperature is 400-600 ℃ for 3-5 hours, then heating to 1200-1400 ℃, reducing vanadium-containing materials at the temperature, generating elemental vanadium or vanadium carbide from the vanadium-containing materials, continuously vacuumizing in the reaction process, controlling the vacuum degree in the kiln to 20-50 pa for 2-3 hours, controlling the temperature in the kiln to 1100-1200 ℃, and nitriding vanadium at the temperature in the atmosphere of N 2 Atmosphere, gas pressure of 0.05-0.20 Mpa for 2-4 hours, vanadium-containing substance in N 2 And generating vanadium nitride in the atmosphere, and then cooling and discharging to obtain a vanadium-nitrogen alloy product.
The weight ratio of the vanadium-containing raw material powder to the ferric oxide powder to the carbonaceous reducing agent to the binding agent is 100: (3-5): (25-30): (0.4-0.8).
The third part provides a use method of the composite vanadium-nitrogen alloy, wherein the use method of the composite vanadium-nitrogen alloy comprises the following steps: smelting the steelmaking raw materials, tapping at the smelting end point of the converter, and adding the composite vanadium-nitrogen alloy into a ladle.
The mass of the composite vanadium-nitrogen alloy added into the ladle and the mass of molten steel in the ladle need to meet the following relational expression:
0.003％+W composite vanadium-nitrogen *ω N /(100*W Molten steel )≤0.042％①
W in (1) Composite vanadium-nitrogen Adding the total mass (kg) of the composite vanadium-nitrogen alloy into the ladle at the moment t; omega N The mass percent of nitrogen in the composite vanadium-nitrogen alloy is (%); w (W) Molten steel The total mass of molten steel put into a ladle at the moment t, (kg); the time t is any time of tapping; 0.003% represents the original nitrogen concentration of the converter molten steel without vanadium-nitrogen alloy; 0.042% is represented by [ N ]]Saturated solubility in molten steel.
Preferably, the adding method of the composite vanadium-nitrogen alloy comprises the following steps:
if the target V element content in the steel composition is: v is less than or equal to 0.04 percent, the composite vanadium-nitrogen alloy is added when the converter tapping is 1/4 of the converter tapping, and the addition is completed within 20 seconds.
If the target V element content in the steel composition is: v is more than 0.04 percent and less than or equal to 0.08 percent, the addition of the composite vanadium-nitrogen alloy is started within 1/2 of the total amount of the composite vanadium-nitrogen alloy when the converter is tapped for 1/4 of the steel, and the addition of the composite vanadium-nitrogen alloy is started within the other 1/2 of the total amount of the composite vanadium-nitrogen alloy when the converter is tapped for 2/4 of the steel, and the addition is completed within 20 seconds.
If the target V element content in the steel composition is: v is more than 0.08 percent and less than or equal to 0.12 percent, the addition of the composite vanadium-nitrogen alloy is started within 1/3 of the total amount of the composite vanadium-nitrogen alloy when the converter is tapped for 1/4, the addition of the composite vanadium-nitrogen alloy is started within the other 1/3 of the total amount of the composite vanadium-nitrogen alloy when the converter is tapped for 2/4, the addition of the composite vanadium-nitrogen alloy is started within the other 1/3 of the total amount of the composite vanadium-nitrogen alloy when the converter is tapped for 3/4, and the addition of the composite vanadium-nitrogen alloy is completed within 20 seconds.
After the process is adopted, the problem that nitrogen atom concentration at a local position in molten steel exceeds saturation concentration and escapes to the atmosphere due to the concentrated addition of a large amount of composite vanadium-nitrogen alloy is avoided, and the recovery rate of nitrogen elements in the composite vanadium-nitrogen alloy is improved.
The temperature of molten steel at the smelting end point of the converter is 1640-1660 ℃.
The higher the temperature of the molten steel is, the faster the diffusion speed of nitrogen in the molten steel is, which is favorable for improving the transmission speed of nitrogen in the composite vanadium-nitrogen alloy into the molten steel and the recovery rate of nitrogen element in the composite vanadium-nitrogen alloy, but the high temperature of the molten steel can cause the problems of serious peroxidation of the molten steel, serious corrosion of a furnace lining and the like, and the set control parameters of the smelting endpoint temperature of the converter are as follows: the temperature of molten steel at the smelting end point of the converter is more than or equal to 1640 ℃.
The carbon content of the smelting end point of the converter is 0.08-0.20%.
The higher the carbon content of the converter smelting end point is, the lower the oxidizing property of molten steel is, the lower the content of dissolved oxygen [ O ] in the molten steel is, the transmission speed of nitrogen in the composite vanadium-nitrogen alloy into the molten steel is improved, the recovery rate of nitrogen element in the composite vanadium-nitrogen alloy is improved, but the increase of the carbon content of the converter smelting end point can lead to the corresponding increase of the phosphorus content in the molten steel, so that the phosphorus content exceeds a target control range, and the stable increase of the carbon content of the converter smelting end point has difficulty in operation control, and the set carbon content control parameters of the converter smelting end point are as follows under comprehensive consideration: the carbon content of the smelting end point of the converter is more than or equal to 0.08 percent.
According to theoretical calculation, at 1 standard atmospheric pressure and temperature of 1660℃, [ N ]]The saturated solubility in molten steel was about 420ppm, exceeding this concentration [ N ]]The atoms will generate N 2 Diffuse into the atmosphere. That is, in the tapping process, the molten steel in the ladle at the earlier stage of tapping has small mass, and is easy to generate [ N ]]If the composite vanadium-nitrogen alloy is excessively added into a ladle at an early stage or excessively concentrated into the ladle, the concentration of nitrogen atoms at a local position in molten steel exceeds the saturation concentration and diffuses into the atmosphere, so that the yield of nitrogen elements is reduced. Aiming at the problems, the application provides the following composite vanadium-nitrogen alloy adding process: in the composite vanadium-nitrogen alloy adding process, a mode of centralized adding or batch adding is adopted according to the total adding amount of the composite vanadium-nitrogen alloy, if the total adding amount of the composite vanadium-nitrogen alloy is small, the composite vanadium-nitrogen alloy is added at one time in the early tapping stage of a converter, and the molten steel in the ladle is small at the moment, but the nitrogen concentration in the molten steel is still lower than 420ppm due to the small total adding amount of the composite vanadium-nitrogen alloy, so that the phenomenon that nitrogen element escapes from the molten steel due to supersaturation can not occur; if the total adding amount of the composite vanadium-nitrogen alloy is large, the composite vanadium-nitrogen alloy is added in batches in the converter tapping process, and the composite vanadium-nitrogen alloy is gradually added into the steel ladle molten steel along with the gradual increment of the molten steel amount in the steel ladle, so that the nitrogen concentration in the molten steel is always lower than 420ppm, and the large amount of the composite vanadium-nitrogen alloy is completely eradicatedThe concentrated addition of the composite vanadium-nitrogen alloy can cause the problem that the nitrogen atom concentration at the local position in the molten steel exceeds the saturation concentration and escapes to the atmosphere, thereby being beneficial to improving the recovery rate of nitrogen element in the composite vanadium-nitrogen alloy.
The invention has the beneficial effects that:
(1) The surface of the composite vanadium-nitrogen alloy provided by the invention contains a deoxidizer layer, and after the deoxidizer layer is added into molten steel, the deoxidizer layer is firstly melted at the temperature of the molten steel, so that the effect of reducing the content of dissolved oxygen (O) in the molten steel is achieved, and the lower the content of the dissolved oxygen (O) in the molten steel is, the faster the transmission speed of nitrogen in the composite vanadium-nitrogen alloy into the molten steel is; then the inner layer VN of the composite vanadium-nitrogen alloy begins to melt, and the N element with the value of the composite vanadium-nitrogen alloy can be rapidly diffused into the molten steel because the content of dissolved oxygen in the molten steel is low, so that the occurrence rate of the phenomenon that nitrogen in the composite vanadium-nitrogen alloy is diffused into the atmosphere due to poor nitrogen absorption capability of the molten steel is reduced, and the recovery rate of the nitrogen element in the composite vanadium-nitrogen alloy is improved.
(2) In the composite vanadium-nitrogen alloy adding process provided by the invention, a mode of centralized adding or batch adding is adopted according to the total adding amount of the composite vanadium-nitrogen alloy, if the total adding amount of the composite vanadium-nitrogen alloy is small, the composite vanadium-nitrogen alloy is added at one time in the early tapping stage of a converter, and at the moment, the molten steel in a ladle is only 1/4 of the weight of the molten steel, but the nitrogen concentration in the molten steel is still lower than 420ppm due to the small total adding amount of the composite vanadium-nitrogen alloy, so that the phenomenon that nitrogen element escapes from the molten steel due to supersaturation can not occur; if the total adding amount of the composite vanadium-nitrogen alloy is large, the composite vanadium-nitrogen alloy is added in batches in the tapping process of the converter, and the composite vanadium-nitrogen alloy is gradually added into the molten steel of the steel ladle along with the gradual increment of the molten steel amount in the steel ladle, so that the nitrogen concentration in the molten steel is always lower than 420ppm, the problem that the nitrogen atom concentration at a local position in the molten steel exceeds the saturation concentration and escapes to the atmosphere due to the centralized adding of a large amount of composite vanadium-nitrogen alloy is avoided, and the improvement of the nitrogen element recovery rate in the composite vanadium-nitrogen alloy is facilitated.
(3) The invention determines the molten steel temperature of the smelting end point of the converter to be 1640-1660 ℃ and the carbon content to be controlled to be 0.08-0.20%, thereby improving the recovery rate of nitrogen element in the composite vanadium-nitrogen alloy.
Detailed Description
The present application is further illustrated by the following examples:
1. composite vanadium-nitrogen alloy
Example 1
Crushing the deoxidizer and the binder to be less than 2mm, uniformly mixing to obtain deoxidized materials, and pressing the deoxidized materials to the surface of the vanadium-nitrogen alloy ball by using a ball pressing machine.
The pressing process comprises the following steps: firstly, pressing the deoxidized material into a hollow hemispherical shape by using a die, wherein the shape of the hollow part is the same as that of the 1/2 volume part of the vanadium-nitrogen alloy, then filling the vanadium-nitrogen alloy ball into the hollow position of the hemisphere, pressing the other hollow hemispherical deoxidized material into a complete spherical object together with the hollow hemispherical deoxidized material, and then drying at 150 ℃ for 4 hours.
Wherein the deoxidizer layer parameters are shown in table 1 below.
The production process of the vanadium-nitrogen alloy ball comprises the following steps: 100 parts by weight of vanadium pentoxide, 4 parts by weight of ferric oxide, 25 parts by weight of carbon powder and 0.6 part by weight of water glass are uniformly stirred and mixed, then pressed, molded into a sphere or a rugby ball shape, then sent into a calcining kiln for preheating and drying, the treatment temperature is 550 ℃ for 5 hours, then heated to 1350 ℃, the vanadium-containing material is reduced at the temperature, the vanadium-containing material generates elemental vanadium or vanadium carbide, the reaction process is continuously vacuumized, the vacuum degree in the kiln is 25pa, the time is 2.5 hours, then the temperature in the kiln is controlled to 1180 ℃, the nitriding of vanadium is carried out at the temperature, and the atmosphere is N 2 Atmosphere, gas pressure of 0.15Mpa, time of 3 hours, vanadium-containing substance in N 2 And generating vanadium nitride in the atmosphere, and then cooling and discharging to obtain a vanadium-nitrogen alloy product.
Example 2
This example is the same as example 1 except for the parameters of the deoxidizer layer of the composite vanadium-nitrogen alloy.
The specific parameters are shown in table 1.
The composite vanadium-nitrogen alloy is adopted to carry out vanadium and nitrogen increasing and deoxidizing on molten steel, and the target control value of the V component is 0.04%.
Smelting the steelmaking raw materials, tapping at the smelting end point of the converter, and adding the composite vanadium-nitrogen alloy into a ladle.
The mass of the composite vanadium-nitrogen alloy added into the ladle and the mass of molten steel in the ladle need to meet the following relational expression:
0.003％+W composite vanadium-nitrogen *ω N /(100*W Molten steel )≤0.042％①
W in (1) Composite vanadium-nitrogen Adding the total mass (kg) of the composite vanadium-nitrogen alloy into the ladle at the moment t; omega N The mass percent of nitrogen in the composite vanadium-nitrogen alloy is (%); w (W) Molten steel The total mass of molten steel put into a ladle at the moment t, (kg); the time t is any time of tapping; 0.003% represents the original nitrogen concentration of the converter molten steel without vanadium-nitrogen alloy; 0.042% is represented by [ N ]]Saturated solubility in molten steel.
The method for adding the composite vanadium-nitrogen alloy comprises the following steps: the composite vanadium-nitrogen alloy is added when the converter tapping is 1/4 of the converter tapping, and the addition is completed within 20 seconds.
The nitrogen content of the molten steel is detected by adopting a nitrogen-oxygen analyzer commonly used in steel works, and the specific nitrogen increasing effect is shown in table 2.
When tapping is carried out at 1/4 time, the calculation process of whether supersaturation precipitation of [ N ] atoms occurs in molten steel after adding the composite vanadium-nitrogen alloy is as follows: the vanadium-nitrogen alloy contains 18% of nitrogen, the weight of the vanadium-nitrogen alloy layer accounts for 60% of the total weight of the composite vanadium-nitrogen alloy, so that the mass percentage of nitrogen in the composite vanadium-nitrogen alloy is 18% 0.6=10.8%, the nitrogen concentration in molten steel is required to be ensured to be less than 0.042% at the moment of tapping 1/4, and the vanadium-nitrogen alloy is as follows after being brought into the formula (1):
0.003％+W composite vanadium-nitrogen *10.8/(100*W Molten steel )≤0.042％
Obtaining: w (W) Composite vanadium-nitrogen *10.8/(100*W Molten steel )≤0.042％-0.003％，
Obtaining: w (W) Composite vanadium-nitrogen /W Molten steel ≤(0.00039/0.108)
Is obtained W Composite vanadium-nitrogen /W Molten steel ≤0.00361
W at 1/4 of the tapping time Molten steel 1/4 of the total mass of the molten steel in the furnace,namely, the method comprises the following steps:
W composite vanadium-nitrogen /(1/4W Molten steel for whole furnace )≤0.00361
Obtaining: w (W) Composite vanadium-nitrogen /W Molten steel for whole furnace ≤0.00361*0.25
Obtaining W Composite vanadium-nitrogen /W Molten steel for whole furnace ≤0.0009025
The steel enterprises generally adopt the unit of kg/ton steel to express the alloy addition, and the conversion relation between kg and ton is 1000 times, so that the alloy addition is obtained: w (W) Composite vanadium-nitrogen /W Molten steel for whole furnace 0.9025kg of composite vanadium-nitrogen alloy/ton steel.
Namely, when the compound vanadium-nitrogen alloy of which the steel weight is less than or equal to 0.9025 kg/ton is added at 1/4 moment of converter tapping, the supersaturation of nitrogen atoms in molten steel can not occur, and the alloy is in N form 2 Form escape phenomenon.
The vanadium content in the vanadium-nitrogen alloy is about 77%, the weight of the vanadium-nitrogen alloy layer accounts for 60% of the total weight of the composite vanadium-nitrogen alloy, and the vanadium content in molten steel added by the composite vanadium-nitrogen alloy of 0.9025 kg/ton of steel is as follows:
0.9025*0.77*0.6/1000＝0.0417％
thus if the target V element content in the steel composition: v is less than or equal to 0.04 percent, the composite vanadium-nitrogen alloy is added when the converter tapping is started to be 1/4 of the converter tapping, and the addition is completed within 20 seconds, so that N in molten steel due to supersaturation of nitrogen atoms can not be generated 2 Form escape phenomenon.
Example 3
This example is the same as example 1 except for the parameters of the deoxidizer layer of the composite vanadium-nitrogen alloy.
The specific parameters are shown in table 1.
Example 4
This example is the same as example 1 except for the parameters of the deoxidizer layer of the composite vanadium-nitrogen alloy.
The specific parameters are shown in table 1.
Parameters of deoxidizer layer of the composite vanadium-nitrogen alloy produced in Table 1, examples 1-4
Comparative example 1
The comparative example adopts vanadium-nitrogen alloy and Al deoxidizer to simultaneously add vanadium and nitrogen to molten steel and deoxidize the molten steel, wherein the addition amount of the deoxidizer is the same as the total aluminum content of the composite vanadium-nitrogen alloy in example 2.
The process conditions of the comparative example are utilized to carry out vanadium and nitrogen increasing and deoxidizing on molten steel, and the target control value of the V component is 0.04%. The specific nitrogen increasing effect is shown in the following table 2.
Table 2, comparison of Nitrogen-increasing effects of molten steels in example 2 and comparative example 1
As can be seen from table 2, in the case where the addition amounts of vanadium, nitrogen, and aluminum elements are the same, the nitrogen content in the molten steel under the condition of example 2 is significantly higher than that in the molten steel under the condition of comparative example 1, because under the condition of example 2, the deoxidizer layer of the composite vanadium-nitrogen alloy is melted first at the temperature of the molten steel, the oxygen content in the molten steel at that position is reduced, then the inner layer VN of the composite vanadium-nitrogen alloy starts to melt, and the molten steel contacted by VN after melting is molten steel having a lower dissolved oxygen content, so that the diffusion rate of N element into the molten steel is fast, and the recovery rate of nitrogen element in the composite vanadium-nitrogen alloy is high. While under the condition of comparative example 1, although the addition amount of the deoxidizer was not reduced, there was unevenness of deoxidization due to the fact that the deoxidizer could not be uniformly diffused in the molten steel, the deoxidizing effect was good at some positions where it was necessary to exist in the molten steel, and the deoxidizing effect was poor at some positions where it was necessary to have a low nitrogen recovery rate if some vanadium-nitrogen alloy was melted at the position where the deoxidizing effect was poor.
2. Application method of composite vanadium-nitrogen alloy
Example 5
In this example, the composite vanadium-nitrogen alloy obtained in example 2 was added in batches, and the V content in the molten steel was controlled to 0.08%, and the calculation method of whether precipitation of supersaturated [ N ] atoms in the molten steel occurred after the addition of the composite vanadium-nitrogen alloy was the same as in example 2, and will not be described here. The specific process parameters and the nitrogen increasing effect are shown in table 3.
Example 6
In this example, the method for calculating whether supersaturation precipitation of [ N ] atoms occurs in molten steel after adding the composite vanadium-nitrogen alloy obtained in example 2 is the same as that in example 2, and the V content in molten steel is controlled to be 0.12%, and will not be described here. The specific process parameters and the nitrogen increasing effect are shown in table 3.
Comparative example 2
In this comparative example, the composite vanadium-nitrogen alloy obtained in example 2 was added to ladle molten steel at 1/4 of the tapping time, and the vanadium content in the molten steel was controlled to 0.08%. The specific process parameters and the nitrogen increasing effect are shown in table 3.
Comparative example 3
In this comparative example, the composite vanadium-nitrogen alloy obtained in example 2 was intensively added to ladle molten steel at 1/4 of the tapping time, and the vanadium content in the molten steel was controlled to 0.12%. The specific process parameters and the nitrogen increasing effect are shown in table 3.
TABLE 3 comparison of Nitrogen increasing effect of vanadium-nitrogen alloy addition Process on molten Steel
As can be seen from Table 3, the average value of nitrogen content of molten steel in example 5 was 171ppm, and the average value of nitrogen content of molten steel in comparative example 2 was 142ppm, with the composition target of vanadium formulation to 0.08%; example 5 has a nitrogen content 29ppm higher than comparative example 2.
The average value of nitrogen content of molten steel in example 6 was 226ppm, and the average value of nitrogen content of molten steel in comparative example 3 was 187ppm with the composition target of vanadium formulation to 0.12%; example 6 has a nitrogen content 39ppm higher than that of comparative example 3.
The method is characterized in that the vanadium-nitrogen-containing alloy is added in batches in the tapping process of the converter, and the composite vanadium-nitrogen alloy is gradually added into the molten steel of the ladle along with the gradual increment of the molten steel amount in the ladle, so that the nitrogen concentration in the molten steel is always lower than 420ppm, the problem that the nitrogen atom concentration at a local position in the molten steel exceeds the saturation concentration and escapes to the atmosphere due to the centralized addition of a large amount of composite vanadium-nitrogen alloy is avoided, and the nitrogen element recovery rate in the composite vanadium-nitrogen alloy is improved.
Example 7 converter smelting endpoint control Process
In the embodiment, the temperature of the smelting end point of the converter is controlled to be more than or equal to 1640 ℃, the carbon content of the smelting end point of the converter is controlled to be more than or equal to 0.08%, and the composite vanadium-nitrogen alloy obtained in the embodiment 2 is added into a ladle when the converter is tapped for 1/4 of the time.
The specific temperature, carbon content and nitrogen content at the target control value of V component of 0.04% are shown in Table 4.
Comparative example 4
In the comparative example, the temperature of molten steel at the smelting end point of the converter is controlled to be less than 1640 ℃ or the carbon content at the smelting end point of the converter is controlled to be less than 0.08%. And adding the composite vanadium-nitrogen alloy obtained in the example 2 into a ladle when the converter tapping is 1/4 of that of the converter.
The specific temperature, carbon content and nitrogen content at the target control value of V component of 0.04% are shown in Table 4. Table 4, comparison of the Nitrogen increasing effect of the converter smelting endpoint control Process on molten steel
As can be seen from Table 4, the average value of nitrogen content of the molten steel in example 7 was 105ppm, and the average value of nitrogen content of comparative example 4 was 94ppm, with the composition target of vanadium formulation to 0.04%; example 7 has a nitrogen content 11ppm higher than comparative example 4.
The reason is that the recovery rate of nitrogen elements in the composite vanadium-nitrogen alloy is influenced by the temperature and the carbon content of molten steel at the smelting end point of the converter, and specifically, the recovery rate of nitrogen elements in the composite vanadium-nitrogen alloy is higher as the temperature of molten steel at the smelting end point of the converter is higher and the carbon content is higher.
3. Technological combination effect
Example 8
The composite vanadium-nitrogen alloy obtained in the embodiment 2 is used for vanadium and nitrogen increasing and deoxidizing molten steel, the nitrogen content in the molten steel is controlled to be 0.08% by adopting the composite vanadium-nitrogen alloy batch adding process in the content of the invention, the temperature of the molten steel at the smelting end point of a converter is more than or equal to 1640 ℃, and the carbon content at the smelting end point of the converter is more than or equal to 0.08%.
The specific process parameters and nitrogen content are shown in table 5.
Comparative example 5
According to the comparative example, vanadium and nitrogen are added to molten steel simultaneously by using a vanadium-nitrogen alloy and an Al deoxidizer, the vanadium content in the molten steel is controlled to be 0.08%, wherein the addition amount of the deoxidizer is the same as the total aluminum content of the composite vanadium-nitrogen alloy added in the embodiment 8, and the vanadium-nitrogen alloy adding process in the prior art that the vanadium-nitrogen alloy is intensively added to the molten steel of a ladle at the moment of tapping 1/4 is adopted, wherein the temperature of the molten steel at the smelting end point of a converter is less than 1640 ℃ or the carbon content at the smelting end point of the converter is less than 0.08%.
The specific process parameters and nitrogen content are shown in table 5.
TABLE 5 influence of nitrogen content in molten steel using and without the techniques described herein
As can be seen from Table 5, the average value of nitrogen content of molten steel in example 8 using the technique described in the present application was 176.25ppm, while that of comparative example 5 not using the technique described in the present application was 108ppm, with the composition target of vanadium formulation to 0.08%; example 8 has a nitrogen content 68ppm higher than comparative example 5.
The reason is that the dissolved oxygen content in the molten steel, the adding process of the vanadium-nitrogen alloy, the molten steel temperature at the smelting end point of the converter and the carbon content can influence the recovery rate of nitrogen element in the vanadium-nitrogen alloy, and the surface of the composite vanadium-nitrogen alloy provided by the application contains a deoxidizer layer, so that the effect of reducing the dissolved oxygen [ O ] content in the molten steel is achieved; in the composite vanadium-nitrogen alloy adding process, if the total adding amount of the composite vanadium-nitrogen alloy is large, the composite vanadium-nitrogen alloy is added in batches in the converter tapping process, and the composite vanadium-nitrogen alloy is gradually added into the steel ladle molten steel along with the gradual increment of the molten steel amount in the steel ladle, so that the nitrogen concentration in the molten steel is always lower than 420ppm, the problem that a large amount of composite vanadium-nitrogen alloy is intensively added to cause the nitrogen atom concentration at a local position in the molten steel to exceed the saturation concentration and escape to the atmosphere is avoided, and the recovery rate of nitrogen elements in the composite vanadium-nitrogen alloy is improved; the higher the molten steel temperature at the converter smelting end point is, the higher the carbon content is, and the higher the recovery rate of nitrogen element in the composite vanadium-nitrogen alloy is, the control range of the molten steel temperature and the carbon content at the converter smelting end point is determined, and the recovery rate of nitrogen element in the composite vanadium-nitrogen alloy is improved.
From examples 1-8 above, it can be seen that the techniques described herein, whether used alone or in combination, have a positive effect on improving the recovery of nitrogen from vanadium-nitrogen alloys.
Claims (6)
1. The application method of the composite vanadium-nitrogen alloy is characterized in that a steelmaking raw material is smelted by a converter, tapping is carried out at the smelting end point of the converter, the composite vanadium-nitrogen alloy is added into a ladle, the composite vanadium-nitrogen alloy consists of a vanadium-nitrogen alloy and a deoxidizer layer, and the deoxidizer layer is coated on the surface of the vanadium-nitrogen alloy; the vanadium-nitrogen alloy is a vanadium-nitrogen alloy ball; the weight of the deoxidizer layer accounts for 30-60% of the total weight of the composite vanadium-nitrogen alloy; the thickness of the deoxidizer layer is 2-4 mm;
the method for adding the composite vanadium-nitrogen alloy comprises the following steps:
if the target V element content in the steel composition is: v is less than or equal to 0.04 percent, the composite vanadium-nitrogen alloy is added when the converter tapping is 1/4 of the converter tapping, and the addition is completed within 20 seconds;
if the target V element content in the steel composition is: v is more than 0.04 percent and less than or equal to 0.08 percent, the addition of the composite vanadium-nitrogen alloy is started within 1/2 of the total amount of the composite vanadium-nitrogen alloy when the converter is tapped for 1/4 of the steel, and the addition of the composite vanadium-nitrogen alloy is started within 1/2 of the total amount of the composite vanadium-nitrogen alloy when the converter is tapped for 2/4 of the steel, and the addition of the composite vanadium-nitrogen alloy is completed within 20 seconds;
if the target V element content in the steel composition is: v is more than 0.08 percent and less than or equal to 0.12 percent, the addition of the composite vanadium-nitrogen alloy is started to be completed within 20 seconds when the converter is tapped for 1/4, the addition of the composite vanadium-nitrogen alloy is started to be completed within 20 seconds when the converter is tapped for 2/4, and the addition of the composite vanadium-nitrogen alloy is started to be completed within 1/3 and 20 seconds when the converter is tapped for 3/4;
the temperature of molten steel at the smelting end point of the converter is 1640-1660 ℃; and the carbon content of the converter smelting end point is 0.08-0.20%.
2. The method for using the composite vanadium-nitrogen alloy according to claim 1, wherein the mass of the composite vanadium-nitrogen alloy added into the ladle and the mass of the molten steel in the ladle are required to satisfy the following relation:
0.003%+W composite vanadium-nitrogen */（100*W Molten steel ）≤0.042%①
W in (1) Composite vanadium-nitrogen Adding the total mass of the composite vanadium-nitrogen alloy into the ladle at the moment t and kg;the mass percent of nitrogen in the composite vanadium-nitrogen alloy is shown as the percentage; w (W) Molten steel The total mass of molten steel put into a ladle at the moment t is kg; the time t is any time of tapping; 0.003% of the original [ N ] of the converter molten steel without vanadium-nitrogen alloy]Concentration; 0.042% is represented by [ N ]]Saturated solubility in molten steel.
3. The method of using a composite vanadium-nitrogen alloy according to claim 1, wherein the deoxidizer layer contains a deoxidizer and a binder,
the mass ratio of the deoxidizer to the binder is (98-99.5): (0.5-2).
4. The method for using the composite vanadium-nitrogen alloy according to claim 3, wherein the deoxidizer is one or a combination of several of Al, ca and Ba alloys,
the binder comprises: water glass and phenolic resin.
5. The method of claim 1, wherein the nitrogen content in the molten steel is greater than 97ppm after the composite vanadium-nitrogen alloy is added under the condition that the target control value of the V component is 0.04%.
6. The method of claim 4, wherein the process for producing the composite vanadium-nitrogen alloy comprises the steps of:
crushing the deoxidizer and the binder, uniformly mixing to obtain deoxidized materials, and pressing the deoxidized materials to the surface of the vanadium-nitrogen alloy balls by using a ball pressing machine;
the pressing process comprises the following steps:
s1, pressing deoxidized materials into a hollow hemisphere by using a die, wherein the hollow part of the hollow hemisphere is matched with vanadium-nitrogen alloy;
s2, filling vanadium-nitrogen alloy into the hollow part of the hollow hemisphere, pressing the other hollow hemisphere with the vanadium-nitrogen alloy into a complete ball,
s3, drying the complete spherical objects at the temperature of 100-200 ℃ for 4-5 hours.
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