CN106834610A - A kind of high-strength micro alloyed steel multistage combination control nitrogen method - Google Patents
A kind of high-strength micro alloyed steel multistage combination control nitrogen method Download PDFInfo
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- CN106834610A CN106834610A CN201710066916.0A CN201710066916A CN106834610A CN 106834610 A CN106834610 A CN 106834610A CN 201710066916 A CN201710066916 A CN 201710066916A CN 106834610 A CN106834610 A CN 106834610A
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- alloyed steel
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims description 132
- 229910052757 nitrogen Inorganic materials 0.000 title claims description 66
- 238000000034 method Methods 0.000 title claims description 41
- 229910000742 Microalloyed steel Inorganic materials 0.000 title claims description 23
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 98
- 229910000831 Steel Inorganic materials 0.000 claims description 78
- 239000010959 steel Substances 0.000 claims description 78
- 238000010079 rubber tapping Methods 0.000 claims description 59
- 229910052786 argon Inorganic materials 0.000 claims description 49
- 238000007670 refining Methods 0.000 claims description 49
- 238000003723 Smelting Methods 0.000 claims description 35
- 239000002893 slag Substances 0.000 claims description 30
- 239000007789 gas Substances 0.000 claims description 25
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 24
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 24
- 238000009749 continuous casting Methods 0.000 claims description 24
- 239000004571 lime Substances 0.000 claims description 24
- 229910052698 phosphorus Inorganic materials 0.000 claims description 22
- 229910052717 sulfur Inorganic materials 0.000 claims description 22
- 239000000956 alloy Substances 0.000 claims description 21
- 238000007664 blowing Methods 0.000 claims description 17
- 239000008187 granular material Substances 0.000 claims description 15
- 239000005997 Calcium carbide Substances 0.000 claims description 14
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 238000000605 extraction Methods 0.000 claims description 13
- 229910052720 vanadium Inorganic materials 0.000 claims description 13
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 238000013019 agitation Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 238000006467 substitution reaction Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 21
- 239000000203 mixture Substances 0.000 description 20
- 238000004519 manufacturing process Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 13
- 238000003756 stirring Methods 0.000 description 11
- 230000004907 flux Effects 0.000 description 10
- 238000007689 inspection Methods 0.000 description 10
- 229910000616 Ferromanganese Inorganic materials 0.000 description 9
- 229910000592 Ferroniobium Inorganic materials 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 9
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 9
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 238000005070 sampling Methods 0.000 description 9
- 230000007306 turnover Effects 0.000 description 9
- 229910000838 Al alloy Inorganic materials 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000002955 isolation Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006392 deoxygenation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/003—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using inert gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
-
- 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
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
- C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of high-strength micro alloyed steel multistage combination control nitrogen method, methods described step is：Vanadium extraction by converter blowing, converter smelting, LF refining and sheet billet continuous casting molding casting operation, N≤0.005% in the micro alloyed steel finished steel.The present invention forms certain thickness slag blanket on molten steel surface, plays a part of to completely cut off air.Using the weak alloy material of deoxidizing capacity is first added, the strong alloy material of deoxidizing capacity is added afterwards, it is to avoid the generation that strong deoxygenation causes molten steel and air contact nitrogen pick-up occurs in ladle.Buggy ladle is opened and stirs 2min into Argon active station Argon by tapping after terminating, and adjusts molten steel O≤0.002%.LF refining controls the electrical heating time, and refining heating process is dividedly in some parts calcium carbide makes slag form good foamed slag, is covered in the directly contact that molten steel surface forms protective layer, isolation air and molten steel.Jointly controlled by above multiple operation and finally obtain N≤0.005% in micro alloyed steel finished steel.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of high-strength micro alloyed steel multistage combination control nitrogen method.
Background technology
Effect of the nitrogen in steel is existing favourable while again harmful, and such as nitrogen can replace part in stainless steel
Alloy, nitrogen can play a part of the intensity that crystal grain thinning improves material in V-alloyed steel, and nitrogen turns into beneficial element；Nitrogen is low
The cold short of material, nitrogen can be caused in carbon steel can cause the ageing of material in general steel, put forward the hardness of steel, intensity
Height, but plasticity and toughness reduction, particularly in the case of strain ageing, plasticity and toughness reduction are notable.Therefore to low-alloy
For steel, aging phenomenon is harmful.
On the other hand continuous casting billet is caused to ftracture because nitrogen is combined with microalloy element in steel, therefore high-strength micro alloyed steel is produced
Shi Yaoqiu strictly controls nitrogen content.
Therefore, effective control method of nitrogen content in a kind of high-strength micro alloyed steel production process of exploitation is needed in the industry badly.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of high-strength micro alloyed steel multistage combination control nitrogen method.By many
Operation joint control nitrogen, finally realizes the production of high-strength micro alloyed steel low nitrogen steel.
In order to solve the above technical problems, the technical solution used in the present invention is, a kind of high-strength micro alloyed steel multistage combination
Nitrogen method is controlled, methods described step is：Vanadium extraction by converter blowing, converter smelting, LF refining and sheet billet continuous casting molding casting operation, it is described
N≤0.005% in micro alloyed steel finished steel.
Vanadium extraction by converter blowing operation of the present invention, the half steel temperature for obtaining is 1360-1400 DEG C, P≤0.080%, S in half steel
≤0.020%、C≥3.5%。
Converter smelting operation of the present invention, semisteel smelting terminates C in molten steel：0.03-0.06%、P≤0.012%、S≤
0.020%, liquid steel temperature is 1650-1690 DEG C.
Converter smelting operation of the present invention, 2min argon bottom-blowings displacement ladle is oxygen-free environment, ladle before accepting molten steel
Red heat is cleaned, ladle liner temperature >=600 DEG C.
Converter smelting operation of the present invention, pre- melt type refining slag 1.0-2.5kg/t, high-quality granule are added during tapping 1/5
Lime 0.5-2kg/t；CaO content >=88% of the high-quality granule lime, granularity is 10-30mm.Using the hot conditions of molten steel
And dynamic conditions carries out slag making operation, certain thickness slag blanket is formed on molten steel surface, play a part of to completely cut off air.
Converter smelting operation of the present invention, adds alloy material during tapping 1/4, alloy material is added and finished during tapping 3/4.
Converter smelting operation of the present invention, first adds the weak alloy material of deoxidizing capacity, and the strong conjunction of deoxidizing capacity is added afterwards
Gold material, it is to avoid the generation that strong deoxygenation causes molten steel and air contact nitrogen pick-up occurs in ladle, addition for target into
The 85-90% for dividing.
Converter smelting operation of the present invention, tapping terminates, to Argon agitation 2-5min in ladle, adjustment molten steel O≤
0.002%。
LF refining operation of the present invention, electrical heating time 8-15min, calcium carbide addition is 1.0-1.5kg/t, and refining adds
Thermal process is dividedly in some parts calcium carbide makes slag form good foamed slag, be covered in molten steel surface formed protective layer, isolation air with
The directly contact of molten steel.
Sheet billet continuous casting molding casting operation of the present invention, opens and pours first 5 minutes to middle bag blowing argon gas substitution gas；Work as molten steel
Start when pouring basket liquid level did not highly have ladle long nozzle to adding pre- melt type tundish covering flux 0.5- in tundish
0.8kg/t, now stops being operated to tundish Argon.
Mentality of designing of the present invention and CCP are as follows：1st, converter smelting half steel contents temperature, Composition Control requirement；2、
Terminal point control composition, temperature control requirement；3rd, the requirement of ladle temperature used and cleanliness factor；4th, ladle was carried out using first 2 minutes
Argon gas is replaced, while refining slag and high-quality granule lime the fusing covering that will be added using the dynamics stirring condition for tapping good
Completely cut off contact of the molten steel with air in molten steel surface；5th, tapping process is operated using first adduction aurification in the order of deoxidation；
6th, the liquid steel refining process heating-up time is controlled, and calcium carbide is dividedly in some parts in refining treatment early stage；7th, using centre before continuous casting
Bag Argon carries out argon gas displacement, and casting process keeps the cast of tundish constant level, and liquid steel level adopts pre- melt type tundish covering
Agent carries out isolation air.Jointly controlled by above multiple operation and finally obtain nitrogen content percentage by weight in micro alloyed steel finished steel
≤0.005%。
It is using the beneficial effect produced by above-mentioned technical proposal：1st, 2min argon bottom-blowings displacement ladle before molten steel is accepted
It is oxygen-free environment, pre- melt type refining slag 1.0-2.5kg/t, high-quality granule lime 0.5-2kg/t, using steel is added during tapping 1/5
The hot conditions and dynamic conditions of water carry out slag making operation, and certain thickness slag blanket is formed on molten steel surface, play isolation empty
The effect of gas.2nd, alloy material is added during tapping 1/4, alloy material is added and finished during tapping 3/4, it is weak using first addition deoxidizing capacity
Alloy material, adds the strong alloy material of deoxidizing capacity afterwards, it is to avoid strong deoxygenation occurs in ladle and causes molten steel to be connect with air
Touch the generation of nitrogen pick-up.3rd, buggy ladle is opened after tapping terminates stirs 2min, adjustment molten steel O into Argon active station Argon：≤
0.002%.LF refining controls the electrical heating time, and refining heating process is dividedly in some parts calcium carbide makes slag form good foamed slag, covers
Cover the directly contact that protective layer, isolation air and molten steel are formed in molten steel surface.Jointly controlled by above multiple operation and finally obtained
Nitrogen content is≤0.005% in obtaining micro alloyed steel finished steel.Low cost of the present invention, it is easy to accomplish industrialized production.
Specific embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
There is the high-strength micro alloyed steel such as C700L, C750L, S700MC using the present invention high-strength automobile steel of production, added up
Produce 610 heats and amount to and reach 100,000 tons, nitrogen is controlled in production process and is touched the mark.
Embodiment 1
The production high-strength microalloy automobile steels of C700L, 16308199 heats, semi-steel after extraction of vanadium composition is C：3.97%, P：
0.072%, S：0.017%, temperature is 1385 DEG C；Half steel enters converter smelting, smelting endpoint C：0.04%, P：0.009%, S：
0.019%, temperature is 1685 DEG C, is tapped using 680 DEG C of turnover ladles, and Argon 2min before tapping adds pre- melt type during tapping 1/5
Refining slag 2kg/t, adds high-quality granule lime 1.2kg/t, and ferro-niobium, vanadium iron, low-carbon ferromanganese, platform aluminium alloy are added during tapping 1/4
Material, is added during tapping 3/4 and finishes, and addition sequence is first to add deoxidizing capacity weak, and the strong alloy material of deoxidizing capacity is added afterwards, plus
It is the 88% of target component to enter amount.Tapping stirs 2min after terminating in Argon station Argon, determines oxygen result for 8ppm, and sampling analysis is surveyed
It is 0.0027% to determine nitrogen content, and outbound to go LF refining to adjust temperature and composition, slagging process is dividedly in some parts calcium carbide 1.2kg/t altogether,
Fat lime slag making is added, the refining accumulative heat time is 8min, and refining process submerged arc is good, and adjusting component temperature reaches target
Outbound after value to remove continuous casting, outbound inspection nitrogen content is 0.003%, and continuous casting is opened and pours preceding 5min and carry out gas displacement to middle bag blowing argon gas,
Open to pour rear molten steel face and do not had after ladle long nozzle and add pre- melt type tundish covering flux addition for 0.6kg/t, in unwrap and pour after
Pulling rate is controlled to be poured into a mould for 1.1m/min, it is 0.0032% to control final finished to check nitrogen content through above step.
Embodiment 2
The production high-strength microalloy automobile steels of C700L, 16101786 heats, semi-steel after extraction of vanadium composition is C：4.07%, P：
0.053%, S：0.015%, temperature is 1389 DEG C；Half steel enters converter smelting, smelting endpoint C：0.04%, P：0.007%, S：
0.016%, temperature is 1675 DEG C, is tapped using 640 DEG C of turnover ladles, and Argon 2 minutes before tapping adds pre- melt type during tapping 1/5
Refining slag 2kg/t, adds high-quality granule lime 1.2kg/t, and ferro-niobium, vanadium iron, low-carbon ferromanganese, platform aluminium alloy are added during tapping 1/4
Material, is added during tapping 3/4 and finishes, and addition sequence is first to add deoxidizing capacity weak, and the strong alloy material of deoxidizing capacity is added afterwards, plus
It is the 85% of target component to enter amount.Tapping stirs 2min after terminating in Argon station Argon, determines oxygen result for 4ppm, and sampling analysis is surveyed
It is 0.0032% to determine nitrogen content, and outbound to go LF refining to adjust temperature and composition, slagging process is dividedly in some parts calcium carbide 1.5kg/t altogether,
Fat lime slag making is added, the refining accumulative heat time is 10min, and refining process submerged arc is good, and adjusting component temperature reaches mesh
Outbound after scale value to remove continuous casting, outbound inspection nitrogen content is 0.0035%, and continuous casting is opened to pour preceding 5min and carry out gas to middle bag blowing argon gas and put
Change, open to pour rear molten steel face and do not had after ladle long nozzle and add pre- melt type tundish covering flux addition for 0.6kg/t, in unwrap and pour
Pulling rate is controlled to be poured into a mould for 1.1m/min afterwards, it is 0.0037% to control final finished nitrogen content to check nitrogen content through above step.
Embodiment 3
The production high-strength microalloy automobile steels of C750L, 16306970 heats, semi-steel after extraction of vanadium composition is C：4.2%, P：
0.058%, S：0.019%, temperature is 1379 DEG C；Half steel enters converter smelting, smelting endpoint C：0.05%, P：0.010%, S：
0.019%, temperature is 1679 DEG C, is tapped using 660 DEG C of turnover ladles, and Argon 2min before tapping adds pre- melt type during tapping 1/5
Refining slag 2kg/t, adds high-quality granule lime 1.5kg/t, and ferro-niobium, vanadium iron, low-carbon ferromanganese, platform aluminium alloy are added during tapping 1/4
Material, is added during tapping 3/4 and finishes, and addition sequence is first to add deoxidizing capacity weak, and the strong alloy material of deoxidizing capacity is added afterwards, plus
It is the 86% of target component to enter amount.Tapping stirs 2min after terminating in Argon station Argon, determines oxygen result for 13ppm, sampling analysis,
It is 0.0024% to determine nitrogen content, and outbound to go LF refining to adjust temperature and composition, slagging process is dividedly in some parts calcium carbide 1.2kg/ altogether
T, adds fat lime slag making, and the refining accumulative heat time is 10min, and refining process submerged arc is good, and adjusting component temperature reaches
Outbound after desired value to remove continuous casting, outbound inspection nitrogen content is 0.003%, and continuous casting is opened and pours preceding 5min and carry out gas to middle bag blowing argon gas
Displacement, opens to pour rear molten steel face and there be not after ladle long nozzle and adds pre- melt type tundish covering flux addition for 0.5kg/t, in unwrap
Control pulling rate to be poured into a mould for 1.05m/min after pouring, through above step control final finished nitrogen content check nitrogen content be
0.0034%。
Embodiment 4
The production high-strength microalloy automobile steels of C750L, 16206338 heats, semi-steel after extraction of vanadium composition is C：4.13%, P：
0.062%, S：0.013%, temperature is 1395 DEG C；Half steel enters converter smelting, smelting endpoint C：0.04%, P：0.009%, S：
0.017%, temperature is 1665 DEG C, is tapped using 630 DEG C of turnover ladles, and Argon 2min before tapping adds pre- melt type during tapping 1/5
Refining slag 2kg/t, adds high-quality granule lime 1.5kg/t, and ferro-niobium, vanadium iron, low-carbon ferromanganese, platform aluminium alloy are added during tapping 1/4
Material, is added during tapping 3/4 and finishes, and addition sequence is first to add deoxidizing capacity weak, and the strong alloy material of deoxidizing capacity is added afterwards, plus
It is the 89% of target component to enter amount.Tapping stirs 2min after terminating in Argon station Argon, determines oxygen result for 12ppm, sampling analysis,
It is 0.0035% to determine nitrogen content, and outbound to go LF refining to adjust temperature and composition, slagging process is dividedly in some parts calcium carbide 1.0kg/ altogether
T, adds fat lime slag making, and the refining accumulative heat time is 12min, and refining process submerged arc is good, and adjusting component temperature reaches
Outbound after desired value to remove continuous casting, outbound inspection nitrogen content is 0.0038%, and continuous casting is opened and pours preceding 5min and carry out gas to middle bag blowing argon gas
Displacement, opens to pour rear molten steel face and there be not after ladle long nozzle and adds pre- melt type tundish covering flux addition for 0.5kg/t, in unwrap
Control pulling rate to be poured into a mould for 1.1m/min after pouring, through above step control final finished nitrogen content check nitrogen content be
0.0038%。
Embodiment 5
The production high-strength microalloy automobile steels of S700MC, 16206862 heats, semi-steel after extraction of vanadium composition is C：3.89%, P：
0.065%, S：0.012%, temperature is 1397 DEG C；Half steel enters converter smelting, smelting endpoint C：0.03%, P：0.011%, S：
0.019%, temperature is 1690 DEG C, is tapped using 720 DEG C of turnover ladles, and Argon 2min before tapping adds pre- melt type during tapping 1/5
Refining slag 2kg/t, adds high-quality granule lime 1.2kg/t, and ferro-niobium, vanadium iron, low-carbon ferromanganese, platform aluminium alloy are added during tapping 1/4
Material, is added during tapping 3/4 and finishes, and addition sequence is first to add deoxidizing capacity weak, and the strong alloy material of deoxidizing capacity is added afterwards, plus
It is the 88% of target component to enter amount.Tapping stirs 2min after terminating in Argon station Argon, determines oxygen result for 16ppm, sampling analysis,
It is 0.0036% to determine nitrogen content, and outbound to go LF refining to adjust temperature and composition, slagging process is dividedly in some parts calcium carbide 1.2kg/ altogether
T, adds fat lime slag making, and the refining accumulative heat time is 9min, and refining process submerged arc is good, and adjusting component temperature reaches mesh
Outbound after scale value to remove continuous casting, outbound inspection nitrogen content is 0.0038%, and continuous casting is opened to pour preceding 5min and carry out gas to middle bag blowing argon gas and put
Change, open to pour rear molten steel face and do not had after ladle long nozzle and add pre- melt type tundish covering flux addition for 0.7kg/t, in unwrap and pour
Control pulling rate to be poured into a mould for 1.05m/min afterwards, through above step control final finished nitrogen content check nitrogen content be
0.0043%。
Embodiment 6
The production high-strength microalloy automobile steels of CGLC780,16306777 heats, semi-steel after extraction of vanadium composition is C：3.77%, P：
0.064%, S：0.017%, temperature is 1382 DEG C；Half steel enters converter smelting, smelting endpoint C：0.04%, P：0.012%, S：
0.019%, temperature is 1673 DEG C, is tapped using 660 DEG C of turnover ladles, and Argon 2min before tapping adds pre- melt type during tapping 1/5
Refining slag 2kg/t, adds high-quality granule lime 1.5kg/t, and ferro-niobium, vanadium iron, low-carbon ferromanganese, platform aluminium alloy are added during tapping 1/4
Material, is added during tapping 3/4 and finishes, and addition sequence is first to add deoxidizing capacity weak, and the strong alloy material of deoxidizing capacity is added afterwards, plus
It is the 87% of target component to enter amount.Tapping stirs 2min after terminating in Argon station Argon, determines oxygen result for 6ppm, and sampling analysis is surveyed
It is 0.0032% to determine nitrogen content, and outbound to go LF refining to adjust temperature and composition, slagging process is dividedly in some parts calcium carbide 1.5kg/t altogether,
Fat lime slag making is added, the refining accumulative heat time is 12min, and refining process submerged arc is good, and adjusting component temperature reaches mesh
Outbound after scale value to remove continuous casting, outbound inspection nitrogen content is 0.0038%, and continuous casting is opened to pour preceding 5min and carry out gas to middle bag blowing argon gas and put
Change, open to pour rear molten steel face and do not had after ladle long nozzle and add pre- melt type tundish covering flux addition for 0.8kg/t, in unwrap and pour
Pulling rate is controlled to be poured into a mould for 1.0m/min afterwards, it is 0.0038% to control final finished nitrogen content to check nitrogen content through above step.
Embodiment 7
The production high-strength microalloy automobile steels of S700MC-TY, 16208195 heats, semi-steel after extraction of vanadium composition is C：3.72%, P：
0.066%, S：0.012%, temperature is 1386 DEG C；Half steel enters converter smelting, smelting endpoint C：0.03%, P：0.009%, S：
0.017%, temperature is 1687 DEG C, is tapped using 640 DEG C of turnover ladles, and Argon 2min before tapping adds pre- melt type during tapping 1/5
Refining slag 2kg/t, adds high-quality granule lime 1.5kg/t, and ferro-niobium, vanadium iron, low-carbon ferromanganese, platform aluminium alloy are added during tapping 1/4
Material, is added during tapping 3/4 and finishes, and addition sequence is first to add deoxidizing capacity weak, and the strong alloy material of deoxidizing capacity is added afterwards, plus
It is the 86% of target component to enter amount.Tapping stirs 2min after terminating in Argon station Argon, determines oxygen result for 7ppm, and sampling analysis is surveyed
It is 0.0034% to determine nitrogen content, and outbound to go LF refining to adjust temperature and composition, slagging process is dividedly in some parts calcium carbide 1.5kg/t altogether,
Fat lime slag making is added, the refining accumulative heat time is 11min, and refining process submerged arc is good, and adjusting component temperature reaches mesh
Outbound after scale value to remove continuous casting, outbound inspection nitrogen content is 0.0039%, and continuous casting is opened to pour preceding 5min and carry out gas to middle bag blowing argon gas and put
Change, open to pour rear molten steel face and do not had after ladle long nozzle and add pre- melt type tundish covering flux addition for 0.6kg/t, in unwrap and pour
Control pulling rate to be poured into a mould for 1.05m/min afterwards, through above step control final finished nitrogen content check nitrogen content be
0.0044%。
Embodiment 8
The production high-strength microalloy automobile steels of CGLC780,16306747 heats, semi-steel after extraction of vanadium composition is C：3.50%, P：
0.080%, S：0.020%, temperature is 1360 DEG C；Half steel enters converter smelting, smelting endpoint C：0.06%, P：0.012%, S：
0.020%, temperature is 1650 DEG C, is tapped using 600 DEG C of turnover ladles, and Argon 2min before tapping adds pre- melt type during tapping 1/5
Refining slag 2.5kg/t, adds high-quality granule lime 2kg/t, and ferro-niobium, vanadium iron, low-carbon ferromanganese, platform aluminium alloy are added during tapping 1/4
Material, is added during tapping 3/4 and finishes, and addition sequence is first to add deoxidizing capacity weak, and the strong alloy material of deoxidizing capacity is added afterwards, plus
It is the 90% of target component to enter amount.Tapping stirs 3min after terminating in Argon station Argon, determines oxygen result for 13ppm, sampling analysis,
It is 0.0034% to determine nitrogen content, and outbound to go LF refining to adjust temperature and composition, slagging process is dividedly in some parts calcium carbide 1.5kg/ altogether
T, adds fat lime slag making, and the refining accumulative heat time is 9min, and refining process submerged arc is good, and adjusting component temperature reaches mesh
Outbound after scale value to remove continuous casting, outbound inspection nitrogen content is 0.0039%, and continuous casting is opened to pour preceding 5min and carry out gas to middle bag blowing argon gas and put
Change, open to pour rear molten steel face and do not had after ladle long nozzle and add pre- melt type tundish covering flux addition for 0.8kg/t, in unwrap and pour
Pulling rate is controlled to be poured into a mould for 1.35m/min afterwards, it is 0.005% to control final finished nitrogen content to check nitrogen content through above step.
Embodiment 9
The production high-strength microalloy automobile steels of S700MC, 16206853 heats, semi-steel after extraction of vanadium composition is C：3.55%, P：
0.075%, S：0.020%, temperature is 1400 DEG C；Half steel enters converter smelting, smelting endpoint C：0.03%, P：0.011%, S：
0.019%, temperature is 1690 DEG C, is tapped using 620 DEG C of turnover ladles, and Argon 2min before tapping adds pre- melt type during tapping 1/5
Refining slag 1.0kg/t, adds high-quality granule lime 0.5kg/t, adds ferro-niobium, vanadium iron, low-carbon ferromanganese, platform aluminium to close during tapping 1/4
Gold material, adds during tapping 3/4 and finishes, and addition sequence is first to add deoxidizing capacity weak, and the strong alloy material of deoxidizing capacity is added afterwards,
Addition is the 85% of target component.Tapping stirs 5min after terminating in Argon station Argon, determines oxygen result for 11ppm, sampling point
Analysis, it is 0.0032% to determine nitrogen content, and outbound to go LF refining to adjust temperature and composition, slagging process is dividedly in some parts calcium carbide and amounts to
1.0kg/t, adds fat lime slag making, and the refining accumulative heat time is 15min, and refining process submerged arc is good, adjusting component temperature
Degree reach it is outbound after desired value remove continuous casting, outbound inspection nitrogen content is 0.0036%, and continuous casting is opened and pours preceding 5min and enter to middle bag blowing argon gas
Row gas displacement, opens to pour rear molten steel face and there be not after ladle long nozzle and adds pre- melt type tundish covering flux addition for 0.5kg/t,
In unwrap pour after control pulling rate to be poured into a mould for 1.15m/min, through above step control final finished nitrogen content inspection nitrogen content
It is 0.0046%.
Above example is only used to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that：Still the present invention can be modified or be waited
With replacement, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover in power of the invention
In the middle of sharp claimed range.
Claims (10)
1. a kind of high-strength micro alloyed steel multistage combination control nitrogen method, it is characterised in that methods described step is：Vanadium extraction by converter blowing, turn
Stove smelting, LF refining and sheet billet continuous casting molding casting operation, N≤0.005% in the micro alloyed steel finished steel.
2. nitrogen method is controlled in a kind of high-strength micro alloyed steel multistage combination according to claim 1, it is characterised in that the converter
Vanadium extraction operation, the half steel temperature for obtaining is 1360-1400 DEG C, P≤0.080%, S≤0.020%, C >=3.5% in half steel.
3. nitrogen method is controlled in a kind of high-strength micro alloyed steel multistage combination according to claim 1, it is characterised in that the converter
Smelting procedure, semisteel smelting terminates C in molten steel：0.03-0.06%, P≤0.012%, S≤0.020%, liquid steel temperature is 1650-
1690℃。
4. nitrogen method is controlled in a kind of high-strength micro alloyed steel multistage combination according to claim 1, it is characterised in that the converter
Smelting procedure, 2min argon bottom-blowings displacement ladle is oxygen-free environment, ladle liner temperature >=600 DEG C before accepting molten steel.
5. nitrogen method is controlled in a kind of high-strength micro alloyed steel multistage combination according to claim 1-4 any one, and its feature exists
In the converter smelting operation adds pre- melt type refining slag 1.0-2.5kg/t, high-quality granule lime 0.5-2kg/ during tapping 1/5
t；CaO content >=88% of the high-quality granule lime, granularity is 10-30mm.
6. nitrogen method is controlled in a kind of high-strength micro alloyed steel multistage combination according to claim 1-4 any one, and its feature exists
In the converter smelting operation adds alloy material during tapping 1/4, alloy material is added and finished during tapping 3/4.
7. nitrogen method is controlled in a kind of high-strength micro alloyed steel multistage combination according to claim 1-4 any one, and its feature exists
In the converter smelting operation first adds the weak alloy material of deoxidizing capacity, and the strong alloy material of deoxidizing capacity, addition are added afterwards
It is the 85-90% of target component.
8. nitrogen method is controlled in a kind of high-strength micro alloyed steel multistage combination according to claim 1-4 any one, and its feature exists
In the converter smelting operation, tapping terminates, and to Argon agitation 2-5min in ladle, adjusts molten steel O≤0.002%.
9. nitrogen method is controlled in a kind of high-strength micro alloyed steel multistage combination according to claim 1-4 any one, and its feature exists
In, the LF refining operation, electrical heating time 8-15min, calcium carbide addition is 1.0-1.5kg/t.
10. nitrogen method is controlled in a kind of high-strength micro alloyed steel multistage combination according to claim 1-4 any one, and its feature exists
In the sheet billet continuous casting molding casting operation is opened and pours first 5 minutes to middle bag blowing argon gas substitution gas；Pre- melt type tundish covering
Agent addition is 0.5-0.8kg/t.
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Cited By (2)
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|---|---|---|---|---|
| CN112553407A (en) * | 2020-12-25 | 2021-03-26 | 广西永烨金属材料科技有限公司 | Preparation method of nitrogen-controlled nuclear-grade special steel |
| CN114807515A (en) * | 2022-05-05 | 2022-07-29 | 湖南华菱涟源钢铁有限公司 | Method for controlling nitrogen increase of molten steel in BOF-LF-CC process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334050A (en) * | 2013-06-13 | 2013-10-02 | 河北钢铁股份有限公司唐山分公司 | Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel |
| CN103952511A (en) * | 2014-04-03 | 2014-07-30 | 商洛学院 | Method for controlling nitrogen content of high-strength steel molten steel |
| CN104046923A (en) * | 2014-06-25 | 2014-09-17 | 攀钢集团西昌钢钒有限公司 | X80 pipeline steel smelted under semisteel conditions and production technique thereof |
-
2017
- 2017-02-07 CN CN201710066916.0A patent/CN106834610A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103334050A (en) * | 2013-06-13 | 2013-10-02 | 河北钢铁股份有限公司唐山分公司 | Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel |
| CN103952511A (en) * | 2014-04-03 | 2014-07-30 | 商洛学院 | Method for controlling nitrogen content of high-strength steel molten steel |
| CN104046923A (en) * | 2014-06-25 | 2014-09-17 | 攀钢集团西昌钢钒有限公司 | X80 pipeline steel smelted under semisteel conditions and production technique thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112553407A (en) * | 2020-12-25 | 2021-03-26 | 广西永烨金属材料科技有限公司 | Preparation method of nitrogen-controlled nuclear-grade special steel |
| CN114807515A (en) * | 2022-05-05 | 2022-07-29 | 湖南华菱涟源钢铁有限公司 | Method for controlling nitrogen increase of molten steel in BOF-LF-CC process |
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Application publication date: 20170613 |