CN107475481B - Control the steel-casting smelting process of Nb content - Google Patents
Control the steel-casting smelting process of Nb content Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000003723 Smelting Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 15
- 238000005266 casting Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 109
- 239000010959 steel Substances 0.000 claims abstract description 109
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 16
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 16
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 14
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 7
- 241001417490 Sillaginidae Species 0.000 claims abstract description 6
- 229910001341 Crude steel Inorganic materials 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 5
- 239000010955 niobium Substances 0.000 claims description 52
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 34
- 239000011651 chromium Substances 0.000 claims description 34
- 239000001301 oxygen Substances 0.000 claims description 34
- 229910052760 oxygen Inorganic materials 0.000 claims description 34
- 230000000694 effects Effects 0.000 claims description 24
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 22
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 22
- 230000003595 spectral effect Effects 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- 229910000805 Pig iron Inorganic materials 0.000 claims description 12
- 239000004615 ingredient Substances 0.000 claims description 10
- 239000011572 manganese Substances 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 10
- 229910052791 calcium Inorganic materials 0.000 claims description 9
- 239000011575 calcium Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 238000005261 decarburization Methods 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 4
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 241001062472 Stokellia anisodon Species 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical group [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 229910000389 calcium phosphate Inorganic materials 0.000 claims 1
- 239000001506 calcium phosphate Substances 0.000 claims 1
- 235000011010 calcium phosphates Nutrition 0.000 claims 1
- 238000005868 electrolysis reaction Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 239000000956 alloy Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- UUVBYOGFRMMMQL-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca].OP(O)(O)=O UUVBYOGFRMMMQL-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- C21C7/068—Decarburising
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
A kind of steel-casting smelting process controlling Nb content, include the steps that EAF furnace smelts crude steel, the refining of LF furnace, the smelting of VOD furnace, LF furnace adjusting component, first the content of C, Cr, Ni, Mo element is adjusted in LF furnace refinement step, C content drops in VOD furnace smelting step, Cr, Mn, V and C, Ni, Mo and Nb content are adjusted in LF furnace adjusting component step, it is required to technique is met, control method through the invention, the rate of recovery of Nb content can reach 95% or more, and 60% rate of recovery than before improves 35%；98% or more the accuracy rate of Nb element, control method through the invention accurately control content of the Nb element in molten steel, without being unable to control due to Nb element is oxidized and reduced；Although content of the Nb content in molten steel is low, control method through the invention can ensure that Nb content will not be exceeded.
Description
Technical field
The present invention relates to steel-casting technical field of smelting more particularly to a kind of steel-casting smelting processes for controlling Nb content.
Background technique
Nb is added in steel as micro alloying element, can change the microstructure of steel, to steel have good refined crystalline strengthening,
Dispersion-strengthened action；Nb can generate stable carbide and carbonitride with C, N in steel, but also can make carbide point
It dissipates, and forms the steel with grain refining.Nb can also be precipitated by induction and control cooling velocity, realizes precipitate disperse point
Cloth adjusts the toughness levels of steel in a wider scope.Therefore, Nb is added not only can be improved the intensity of steel, can also improve
Toughness, high temperature oxidation resistance and the corrosion resistance of steel reduce steel brittleness transition temperature, the welding performance and processability obtained.
With the development of science and technology, especially in heat-resisting (such as power generation) field, applying working condition gets over material performance requirement
Come stringenter, the heat resistance of material is required very high, it is more and more common that suitable Nb is added in the material.
Nb is a kind of rare refractory metal, 2468 ° of fusing point, 4742 ° of boiling point, and although being stabilized at room temperature,
But also alloy can be formed with titanium, zirconium, tungsten etc. with sulphur, nitrogen, the direct chemical combination of carbon at high temperature, can also be reacted at high temperature with oxygen
Generate NbxOy.Which adds the control difficulty of Nb element in steelmaking process, on the one hand cause the rate of recovery of Nb element low,
On the other hand, it once Nb element is reduced in the later period, is very easy to cause in molten steel that Nb element is exceeded, scraps whole furnace molten steel,
Cost of idleness.
Summary of the invention
It is necessary to propose a kind of control Nb for carrying out comprehensively control to each Nb element and other each elements in smelting process
The steel-casting smelting process of content.
A kind of steel-casting smelting process controlling Nb content, comprising the following steps:
EAF furnace smelts crude steel: preparing steel scrap, the pig iron as smelting according to the ratio that the weight ratio of steel scrap and the pig iron is 3:1
Material, then according to steel scrap and the pig iron fusing after molten steel quality 8kg/t ratio prepare lime, by steel scrap, the pig iron,
Lime puts into fusing in EAF furnace, obtains mixing molten steel, and de- P to P content is 0.005% hereinafter, molten steel temperature to be mixed reaches
1620 ~ 1660 DEG C go out molten steel to LF furnace；
The refining of LF furnace: active stone is added according to the ratio of 5kg/t, 1kg/t of the weight of the mixing molten steel reached in LF furnace
Ash and fluorite, adjust steel slag, then slag hitting measures the oxygen activity of molten steel, and aluminum shot and silico-calcium also raw steel is added according to oxygen activity
Liquid carries out de- S to molten steel by molten steel heating to 1590~1610 DEG C, until S content is 0.005% hereinafter, sampling spectral detection C,
The content of Cr, Ni, Mo, Nb, V element, the content of first coarse adjustment C, Cr, Ni, Mo element is wanted to technique is met according to testing result
It asks, tapping to VOD furnace, wherein C content is adjusted between 0.4%~0.6%, is prepared for the oxygen decarburization of VOD；
VOD furnace is smelted: the molten steel in VOD furnace being carried out to vacuumize oxygen decarburization, the C content in molten steel is made to be reduced to 0.3%
Below；
LF furnace adjusting component: after VOD furnace melting, molten steel is transported to LF furnace and carries out composition adjustment；
Firstly, according to VOD furnace smelt before spectral detection result in Cr, Mn, V content, sequentially add nitrided ferro-chromium,
Electrolytic manganese, vanadium iron are required with adjusting the content of Cr, Mn, V to technique is met；
Secondly, fine tuning C, Ni, Mo ingredient, until each ingredient meets technique requirement；
Third adjusts Nb content, measures the oxygen activity of molten steel before adjustment again, be after if oxygen activity is higher than 5ppm
The continuous oxygen activity that Al, silico-calcium reducing agent reduction molten steel are added, until oxygen activity is reduced to 5ppm hereinafter, ferro-niobium is added later
Nb content is adjusted, after being passed through argon gas stirring 5min later, samples inspection；
The calculation formula of the additional amount of the ferro-niobium are as follows: Nb in the spectral detection result before ferro-niobium additional amount=VOD furnace smelting
Content * molten steel total amount/[ ferro-niobium content * (95% ~ 98%) ], wherein molten steel total amount and ferro-niobium additional amount unit are Kg, and ferro-niobium contains
Amount is the percentage composition of niobium in the raw and auxiliary material of adjusting component selection, and 95% ~ 98% is scaling loss constant.
The rate of recovery of control method through the invention, Nb content can reach 95% or more, 60% rate of recovery than before
Improve 35%；98% or more the accuracy rate of Nb element, control method through the invention accurately control Nb element in molten steel
In content, without being unable to control due to Nb element is oxidized and reduced；Although content of the Nb content in molten steel is low, pass through
Control method of the invention can ensure that Nb content will not be exceeded, at the same because caused by Nb content is exceeded molten steel scrappage be zero,
Greatly improve production efficiency.
Specific embodiment
In order to illustrate the technical solution of the embodiments of the present invention more clearly, being done further to technical solution of the present invention below
Explanation.
The embodiment of the invention provides a kind of steel-casting smelting processes for controlling Nb content.According to current material trademark,
Alloy material containing Nb element is generally high alloy material, and common for 9Cr steel, the present invention is with one of the 9Cr steel trade mark
For ZG1Cr9Mo1VNbN, how statement realizes the control of Nb element.
A kind of steel-casting smelting process controlling Nb content, comprising the following steps:
EAF furnace smelts crude steel: preparing steel scrap, the pig iron as smelting according to the ratio that the weight ratio of steel scrap and the pig iron is 3:1
Material, then according to steel scrap and the pig iron fusing after molten steel quality 8kg/t ratio prepare lime, by steel scrap, the pig iron,
Lime puts into fusing in EAF furnace, obtains mixing molten steel, and de- P to P content is 0.005% hereinafter, molten steel temperature to be mixed reaches
1620 ~ 1660 DEG C go out molten steel to LF furnace；
The refining of LF furnace: active stone is added according to the ratio of 5kg/t, 1kg/t of the weight of the mixing molten steel reached in LF furnace
Ash and fluorite, adjust steel slag, then slag hitting measures the oxygen activity of molten steel, and aluminum shot and silico-calcium also raw steel is added according to oxygen activity
Liquid, for example, additional amount is repeatedly added on a small quantity according to the amount that 0.1kg/t is added in molten steel per ton, by molten steel heating to 1590~1610
DEG C, de- S is carried out to molten steel, until S content is 0.005% hereinafter, sampling the content of spectral detection C, Cr, Ni, Mo, Nb, V element,
The content of first coarse adjustment C, Cr, Ni, Mo element is tapped to VOD furnace, wherein C content to technique requirement is met according to testing result
It is adjusted between 0.4%~0.6%, prepares for the oxygen decarburization of VOD；
In the step, before adjusting other alloying elements, needs to guarantee that the reduction atmosphere of molten steel is preferable, avoid these conjunctions
Gold element is oxidized, and cause its real content reduction, so first S content to be controlled it is lower, when avoiding S content higher
Influence to other elements adjustment, moreover, when adjusting other elements, S element is also contained in the raw and auxiliary material of addition, such as
High carbon ferro-chrome, nickel alloy, all contains S element in molybdenum alloy at evanohm, in this way can secondary introducings S element, cause tiring out for S element
Meter and increase, cause S content higher, and molten steel oxidisability is strong, and reproducibility is weak, and the calculated value of each ingredient and reality is caused to be surveyed
Difference in magnitude is away from larger, Composition Control inaccuracy.
Moreover, first adjusting the content of the highest chromium of content, then the lower other elements of content are tuned into, contain chromium in the present invention
The adjustment of amount is divided into coarse adjustment and two steps of fine tuning to complete, this step is coarse adjustment, then adjusts C content again, later again in LF essence
Chromium content is finely tuned in furnace, high-chromium alloy is added when avoiding primary adjustment in the method for being compared to a successive step chromium content in this way
When quote new C ingredient again.
VOD furnace is smelted: the molten steel in VOD furnace being carried out to vacuumize oxygen decarburization, is reduced to the C content in molten steel
0.3% or less；It is smelted using VOD furnace, may be implemented to vacuumize the purpose that oxygen decarburization protects chromium, while reducing carbon content,
Make being oxidized for chromium minimum.
LF furnace adjusting component: after VOD furnace melting, molten steel is transported to LF furnace and carries out composition adjustment；
Firstly, according to VOD furnace smelt before spectral detection result in Cr, Mn, V content, sequentially add nitrided ferro-chromium,
Electrolytic manganese, vanadium iron are required with adjusting the content of Cr, Mn, V to technique is met；
In this step, subject to the content of Cr, Mn, V in spectral detection result before being smelted according to VOD furnace, without with VOD
Subject to content after furnace smelting, the amount for the raw and auxiliary material that needs are added when calculating adjustment in this way is accurately, because of VOD furnace
After smelting, alloy part element is inevitably oxidized, but after molten steel sufficiently restores, these elements can be gone back again
Original comes out, so if the spectral results after being smelted with VOD furnace calculate the amount for needing the raw and auxiliary material for the adjustment being added,
It is exceeded to may result in final Cr, Mn, V content.
Secondly, fine tuning C, Ni, Mo ingredient, until each ingredient meets technique requirement；When adjusting C, Ni, Mo, calculating needs to be added
The content of C, Ni, Mo in spectral detection result after being smelted when the amount of the raw and auxiliary material containing C, Ni, Mo according to VOD furnace.
Third adjusts Nb content, measures the oxygen activity of molten steel before adjustment again, be after if oxygen activity is higher than 5ppm
The single additional amount of the continuous oxygen activity that Al, silico-calcium reducing agent reduction molten steel are added, Al or silico-calcium is added according to molten steel per ton
The amount of 0.1kg/t is repeatedly added on a small quantity, until oxygen activity is reduced to 5ppm hereinafter, ferro-niobium adjustment Nb content is added later, later
After being passed through argon gas stirring 5min, inspection is sampled；
The calculation formula of the additional amount of the ferro-niobium are as follows: Nb in the spectral detection result before ferro-niobium additional amount=VOD furnace smelting
Content * molten steel total amount/[ ferro-niobium content * (95% ~ 98%) ], wherein molten steel total amount and ferro-niobium additional amount unit are Kg, and ferro-niobium contains
Amount is the percentage composition of niobium in the raw and auxiliary material of adjusting component selection, and 95% ~ 98% is scaling loss constant.
In the step of LF furnace refines adjusting component, the content of the highest chromium of content is first adjusted, it is lower being tuned into content
Other elements, in this way, subsequent composition adjustment is smaller on the influence of the composition adjustment of front, while according further to the ability being oxidized
Degree of strength adjusts, and first adjustment is easiest to the chromium being oxidized, the difficult element being oxidized of finally adjustment.
Further, it in " LF furnace adjusting component " step, before adjusting Cr, Mn, V component content, first to detect and adjust
The reproducibility of whole molten steel, method of adjustment are as follows: the Cr content and VOD furnace in spectral detection result before being smelted according to above-mentioned VOD furnace
Cr content after smelting calculates the difference that Cr is oxidized, and according in the difference, the Cr of every oxidation 0.1% adds into molten steel per ton
Enter the silico-calcium of the Al grain and 0.1~0.3kg of 0.2~0.5kg, until the oxygen activity of molten steel is lower than 5ppm.
Chromium that VOD furnace is inevitably oxidized sufficiently can be reduced out by this operation, true to reflect chromium in molten steel
Actual content, but also molten steel is adjusted to preferable reproducibility, avoids molten steel oxidation susceptibility relatively strong and each ingredient is caused to contain
The inaccuracy of amount.
Further, in " fine tuning C, Ni, Mo ingredient " the step of, at the same to detect Al content be maintained at 0.015% ~
Between 0.025%, temperature is maintained between 1600 ~ 1620 DEG C, sufficiently to keep the reproducibility of molten steel.If reproducibility it is lower it is necessary to
It is appropriate that Al is added to adjust reproducibility.The single additional amount of Al is repeatedly added on a small quantity according to the amount that 0.1kg/t is added in molten steel per ton.
Further, after " adjustment Nb content " the step of, the sample that will sample inspection carries out spectral detection, and detection is final
Nb content, and oxygen activity and temperature according to testing result adjustment molten steel.
When testing result shows that Nb content is lower than technique required value, illustrate the oxygen activity height of molten steel or the temperature of molten steel
It is relatively low, at this point, heat up to molten steel, until 1620 DEG C, and reducing agent adjustment oxygen activity is added, additional amount adds according to molten steel per ton
The amount for entering 0.1kg/t is repeatedly added on a small quantity, then sub-sampling, until spectral results are consistent with technique required value, tapping.At this time cannot
Ferro-niobium is blindly added, once if ferro-niobium blindly is added, after the ferro-niobium being initially added into is reduced, Nb element is very easy to be more than work
Skill required value.
Further, in " EAF furnace smelts crude steel " step, the operation of de- P is that the oxygen blast into mixing molten steel forms phosphoric acid
Calcium slag, then the slag on molten steel surface is got, so that P content reaches 0.005% or less.
Above-mentioned each component content adjust when, additional amount be it is computable, calculation method be same as ferro-niobium adjustment when additional amount
Calculation method.
The steps in the embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and wants according to right of the present invention
Made equivalent variations is sought, is still belonged to the scope covered by the invention.
Claims (5)
1. a kind of steel-casting smelting process for controlling Nb content, it is characterised in that the following steps are included:
EAF furnace smelts crude steel: it is used as ratio preparation steel scrap, the pig iron of 3:1 according to the weight ratio of steel scrap and the pig iron and smelts material,
Then prepare lime according to the ratio of the 8kg/t of the quality of the molten steel after steel scrap and pig iron fusing, steel scrap, the pig iron, lime are thrown
Enter fusing in EAF furnace, obtain mixing molten steel, de- P to P content is 0.005% hereinafter, molten steel temperature to be mixed reaches 1620 ~ 1660
DEG C go out molten steel to LF furnace；
LF furnace refining: according to reach LF furnace in mixing molten steel weight 5kg/t, 1kg/t ratio be added active lime and
Fluorite adjusts steel slag, then slag hitting measures the oxygen activity of molten steel, and aluminum shot and silico-calcium reduction molten steel is added according to oxygen activity, will
Molten steel heating carries out de- S to 1590~1610 DEG C, to molten steel, until S content is 0.005% hereinafter, sampling spectral detection C, Cr, Ni,
The content of Mo, Nb, V element, the content of first coarse adjustment C, Cr, Ni, Mo element is to technique requirement is met according to testing result, and tapping is extremely
VOD furnace, wherein C content is adjusted between 0.4%~0.6%, is prepared for the oxygen decarburization of VOD；
VOD furnace smelt: the molten steel in VOD furnace is carried out to vacuumize oxygen decarburization, make the C content in molten steel be reduced to 0.3% with
Under；
LF furnace adjusting component: after VOD furnace melting, molten steel is transported to LF furnace and carries out composition adjustment；
Firstly, sequentially adding nitrided ferro-chromium, electrolysis according to the content of Cr, Mn, V in the spectral detection result before the smelting of VOD furnace
Manganese, vanadium iron are required with adjusting the content of Cr, Mn, V to technique is met；
Secondly, fine tuning C, Ni, Mo ingredient, until each ingredient meets technique requirement；
Third, adjustment Nb content, measures the oxygen activity of molten steel again before adjustment, if oxygen activity is higher than 5ppm, to continue to add
Enter the oxygen activity of Al, silico-calcium reducing agent reduction molten steel, until oxygen activity is reduced to 5ppm hereinafter, ferro-niobium adjustment Nb is added later
Content samples inspection after being passed through argon gas stirring 5min later；
The calculation formula of the additional amount of the ferro-niobium are as follows: Nb contains in the spectral detection result before ferro-niobium additional amount=VOD furnace smelting
Measure * molten steel total amount/[ ferro-niobium content * (95% ~ 98%) ], wherein molten steel total amount and ferro-niobium additional amount unit are Kg, and ferro-niobium content is
The percentage composition of niobium in the raw and auxiliary material that adjusting component is selected, 95% ~ 98% is scaling loss constant.
2. the steel-casting smelting process of control Nb content as described in claim 1, it is characterised in that: " LF furnace is adjusted to
Point " in step, before adjusting Cr, Mn, V component content, first to detect and adjust the reproducibility of molten steel, method of adjustment are as follows: root
The Cr content after the Cr content and the smelting of VOD furnace in spectral detection result before smelting according to above-mentioned VOD furnace, calculates what Cr was oxidized
Difference, according in the difference, the Cr of every oxidation 0.1%, be added into molten steel per ton the Al grain of 0.2~0.5kg with 0.1~
The silico-calcium of 0.3kg, until the oxygen activity of molten steel is lower than 5ppm.
3. as described in claim 1 control Nb content steel-casting smelting process, it is characterised in that: " fine tuning C, Ni, Mo at
Point " the step of in, while to detect Al content and be maintained between 0.015% ~ 0.025%, temperature be maintained at 1600 ~ 1620 DEG C it
Between, sufficiently to keep the reproducibility of molten steel.
4. the steel-casting smelting process of control Nb content as described in claim 1, it is characterised in that: in " adjustment Nb content "
After step, the sample for sampling inspection is subjected to spectral detection, detects final Nb content, and according to testing result adjustment molten steel
Oxygen activity and temperature.
5. the steel-casting smelting process of control Nb content as described in claim 1, it is characterised in that: " EAF furnace is smelted thick
In steel " step, the operation of de- P is the oxygen blast into mixing molten steel, formation calcium phosphate slag, then the slag on molten steel surface is got, so that
P content reaches 0.005% or less.
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