CN100513587C - Electric furnace smelting method for high-grade pipe line steel - Google Patents
Electric furnace smelting method for high-grade pipe line steel Download PDFInfo
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- CN100513587C CN100513587C CNB2006100180122A CN200610018012A CN100513587C CN 100513587 C CN100513587 C CN 100513587C CN B2006100180122 A CNB2006100180122 A CN B2006100180122A CN 200610018012 A CN200610018012 A CN 200610018012A CN 100513587 C CN100513587 C CN 100513587C
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 117
- 239000010959 steel Substances 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000003723 Smelting Methods 0.000 title claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 42
- 238000007670 refining Methods 0.000 claims abstract description 39
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000001301 oxygen Substances 0.000 claims abstract description 24
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 24
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 18
- 230000023556 desulfurization Effects 0.000 claims abstract description 18
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910000805 Pig iron Inorganic materials 0.000 claims abstract description 6
- 238000005261 decarburization Methods 0.000 claims abstract description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 239000004571 lime Substances 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 24
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 238000010079 rubber tapping Methods 0.000 claims description 13
- 239000004411 aluminium Substances 0.000 claims description 12
- 239000011575 calcium Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000000047 product Substances 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 238000005262 decarbonization Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 241001062472 Stokellia anisodon Species 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 3
- ULGYAEQHFNJYML-UHFFFAOYSA-N [AlH3].[Ca] Chemical compound [AlH3].[Ca] ULGYAEQHFNJYML-UHFFFAOYSA-N 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000012467 final product Substances 0.000 claims description 2
- 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 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 239000011572 manganese Substances 0.000 abstract description 2
- 239000006260 foam Substances 0.000 abstract 1
- 238000009489 vacuum treatment Methods 0.000 abstract 1
- 238000004458 analytical method Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000000274 adsorptive effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- -1 aluminium calcium iron Chemical compound 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
-
- 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
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
本发明涉及一种高级别管线钢的电炉冶炼方法，包括以下步骤：取重量含量为60%-70%的热铁水、5%-10%的生铁、15%-30%的废钢及5%-20%的海绵铁进行配料，将配好的料送入电炉进行冶炼，冶炼周期为45-55分钟；电炉工艺采用泡沫渣技术；然后进行真空自然氧脱碳，电炉出钢后，钢中富裕氧含量，在真空状态下与钢中的碳进行反应；然后送入LF精炼炉进行精炼造渣，精炼渣碱度控制在2.5-3.5之间(其二元碱度控制在5-7之间)，加入脱氧剂进行脱氧，并将氩气流量控制在300L/min，在20分钟内加入电解锰等合金，当温度升至1600℃左右时，在脱氧良好的情况下，即可同步完成90%的脱硫任务，精炼后期，氩气流量减小到100L/min，少量补加硅铁粉和石灰；然后进行真空处理，再经过连铸工序即可得成品。The invention relates to an electric furnace smelting method for high-grade pipeline steel, comprising the following steps: taking hot molten iron with a weight content of 60%-70%, pig iron of 5%-10%, scrap steel of 15%-30%, and scrap steel of 5%- 20% sponge iron is used for batching, and the prepared materials are sent to the electric furnace for smelting. The smelting cycle is 45-55 minutes; the electric furnace process adopts foam slag technology; then vacuum natural oxygen decarburization is carried out. The oxygen content reacts with the carbon in the steel in a vacuum state; then it is sent to the LF refining furnace for refining and slagging, and the basicity of the refining slag is controlled between 2.5-3.5 (the binary basicity is controlled between 5-7 ), add a deoxidizer for deoxidation, and control the argon flow rate at 300L/min, add electrolytic manganese and other alloys within 20 minutes, when the temperature rises to about 1600°C, and under the condition of good deoxidation, 90 % of the desulfurization task, in the later stage of refining, the argon gas flow rate is reduced to 100L/min, and a small amount of ferrosilicon powder and lime are added; then vacuum treatment is carried out, and the finished product can be obtained through continuous casting process.
Description
Technical field
The present invention relates to a kind of electric furnace smelting method of high-grade pipe line steel, belong to pipeline steel smelting method field.
Background technology
At present, the production of domestic high-grade pipe line steel is based on converter steel, and that adopts electrosmelting has only one family of Wuyang Iron And Steel Company.Domestic steel mills such as Nanjing converter steelmaking factory, Baosteel plum mountain, Shanghai steelworks all adopt preprocessed molten iron+converter smelting+LF refining+RH (VD/VOD) vacuum-treat+continuous casting process production flow line steel.The coverter pig molten iron needs all to take off processing through three, can accurately control tapping terminal point [C] content and [O] content; Refining process uses the refining pre-melted slag in a large number, and the reductor that uses is aluminum shot, sial calcium, and refining procedure does not have the desulfurization task, uses the Ultra-low carbon alumal, the RH vacuum-treat.The smelting difficult point of existing high-grade pipe line steel is the non-metallic inclusion of finished product steel plate, serves as that control is crucial with the category-B aluminum oxide especially.Because the molten iron of converter is handled through desulfurization, refining does not have the desulfurization task, thus less because of the aluminate of forcing Argon stirring molten steel to bring, help improving the molten steel purity, finally reduced the non-metallic inclusion content in the steel plate, satisfied the requirement of pipe line steel the steel plate physicals.And electrosmelting owing to go into stove iron and steel stock structural limitations, must be taked effective desulfurization means, simultaneously controlled oxidation aluminium content.The pipe line steel highest level of present domestic maturation process is X70, and X80 etc. still need and want import.
Summary of the invention
The object of the present invention is to provide a kind of electric furnace smelting method of high-grade pipe line steel,, improve the market competitiveness of electric furnace steel mill to have enlarged the production kind of electric furnace steel mill.
To achieve these goals, technical program of the present invention lies in adopting a kind of electric furnace smelting method of high-grade pipe line steel, getting weight content and be 60%-70% heating molten steel, 5%-10% the pig iron, 15%-30% steel scrap and 5%-20% sponge iron prepares burden, the material for preparing is sent into electric furnace smelt, smelting cycle is 45-55 minutes; Eaf process adopts Foamed Slag Technique, and the best formation condition of foamy slag is basicity R=1.8-22, FeO 25%-35%, CaO 35%-45%, SiO
218%-22%, oxygen flow 3000-4000Nm
3/ h, the tapping condition is [C] 0.04-0.08%; Liquid steel temperature is 1620-1650 ℃ in [P]≤0.008%, ladle; Carry out the decarburization of vacuum nature oxygen then, behind the electric furnace steel tapping, rich oxygen level in the steel, under vacuum state with steel in carbon react, decarbonization rate is a per minute 0.005%-0.008%, reaches the target value of terminal point [C] content≤0.02%; Send into the LF refining furnace then and carry out the refining slag making, the total quantity of slag of refining process is controlled at more than the 20Kg/t steel, and CaO content is controlled between 50%-55% in the slag, SiO in the slag
2Content is controlled between 5%-10%, Al in the slag
2O
3Content is controlled between 20%-30%, between refining slag basicity is controlled at 2.5-3.5 (its dual alkalinity is controlled between 5-7), add reductor and carry out deoxidation, and argon flow amount is controlled at 300L/min, in 20 minutes, add alloys such as electrolytic manganese, when temperature rises to 1600 ℃ of left and right sides, under the good situation of deoxidation, can finish 90% desulfurization task synchronously, the refining later stage, argon flow amount is reduced to 100L/min, adds ferrosilicon powder and lime on a small quantity; Carry out vacuum-treat then, again through continuous casting working procedure get final product finished product.
Eaf process of the present invention adopts Foamed Slag Technique, and Foamed Slag Technique has improved the thermo-efficiency of electric arc, has improved the dephosphorization condition at fusing initial stage, and can satisfy the decarbonization rate of per minute 0.07%～0.10%.The tapping condition is [C]=0.04～0.08%; [P]≤0.008%.Tapping is adopted and is kept away the slag tapping, does not add any alloy and reductor in the ladle; Liquid steel temperature is 1620-1650 ℃ in the ladle.
The principle that vacuum nature oxygen decarbonization process improves with the raising of vacuum tightness for the response capacity of using [0] and [C] under the vacuum, utilize behind the electric furnace steel tapping rich oxygen level in the steel, under vacuum state with steel in carbon react, reach the target value of terminal point [C] content≤0.02%, and can be in conjunction with the apparatus for determination of oxygen measured value, the adding carbon dust removes oxygen unnecessary in the steel before being changed to vacuum, reach decarburization and finish the re-set target of free [O] content≤60ppm, its advantage is can remedy the not enough and terminal point Control for Oxygen Content of eaf process decarburization capacity to be difficult for problem, and can reach the effect of removing gas in the steel in advance and being mingled with, be to smelt high pure soft steel important key link.
The refining slagging process is that the total quantity of slag of refining process is controlled at more than the 20Kg/t steel, and CaO content is controlled between 50%-55% in the slag, SiO in the slag
2Content is controlled between 5%-10%, Al in the slag
2O
3Content is controlled between 20%-30%, and between refining slag basicity is controlled at 2.5-3.5 (its dual alkalinity is controlled between 5-7), above-mentioned slag is formed the adsorptive power that can improve slag and accelerated desulfurization rate.
The deoxidation system is carried out deoxidation for adopting the complex deoxidization system with aluminum steel, aluminium powder, aluminium calcium, ferrosilicon powder etc., and this technology is different from domestic converter steelmaking factory deoxidation system.Production practice show, the decarburization of vacuum nature oxygen is finished and carried out deciding oxygen and feed the aluminium operation, when free [O] content in the steel＜20ppm, feed aluminium 0.9Kg/t steel; When free [0] content is between 20ppm-40ppm in the steel, feed aluminium 1.05Kg/t steel; When free [0] content is between 40ppm-60ppm in the steel, feed aluminium 1.2Kg/t steel; When free [O] content in the steel〉during 60ppm, feed aluminium 1.35Kh/t steel, can satisfy pre-deoxidizing technology needs in early stage, the consumption of refining process aluminium powder is between 0.8-1.2Kg/t steel, aluminium calcium iron consumption is between 0.6-1.2Kg/t steel, guaranteeing under the good situation of steel liquid deoxidation, focusing on controlling steel plate category-B non-metallic inclusion grade does not exceed standard, [A1] is controlled between 0.010-0.020% among the refining Bi Gang, the refining later stage uses 0.2-0.5Kg/t high quality silicon iron powder (C≤0.5%) to carry out diffusive deoxidation according to [Si] content in the steel, and purpose is to reduce the aluminium consumption, improve moiety in the slag, be convenient to the absorption of inclusion.
The desulfurization task is finished at refining procedure, and this technology is different from domestic converter steelmaking factory and adopts heating molten steel to carry out the three desulfurization systems of taking off processing.Refining process adopts big quantity of slag operation, and under above-mentioned slagging regime, argon flow amount is controlled at 300L/min, adds alloys such as electrolytic manganese in 20 minutes, finishes 98% alloying task, and plays the effect of bulk deoxidation.When temperature rises to 1600 ℃ of left and right sides, under the good situation of deoxidation, can finish 90% desulfurization task synchronously, the refining later stage, argon flow amount is reduced to 100L/min, adds ferrosilicon powder and lime on a small quantity, when heating up, keep deoxidation, desulfurization, the absorption of slag to be mingled with ability, but refining is finished below the desulfurization to 0.008%.
The top slag operation is adopted in described vacuum-treat, require all alloys and auxiliary material before vacuum, once to add, the complete part refining slag that removes of refining, add the CaO amount before the vacuum greater than the 2Kg/t steel, the total quantity of slag of vacuum process is greater than the 12Kg/t steel, keep still having stronger desulfurization in the vacuum process, absorption is mingled with effect, add silico-calcium 0.5-1.2Kg/t steel according to [Si] content in the steel before the vacuum, make finished product [Ca] content be not less than 0.0015%, aluminum steel is once feeding before vacuum, do not allow to add after vacuum any alloy and auxiliary material, the vacuum process argon flow amount is controlled according to " first big after small ", promptly presses 100L/min → 80L/min～60L/min control.Promptly strengthen molten steel early stage and stir, carry out degree of depth deoxidation, desulfurization, degas, go to be mingled with, when above-mentioned task acquires a certain degree, control little argon flow amount gradually, help bubble like this, be mingled with to assemble and grow up, floating to slag interface is absorbed by bits.
The present invention has optimized the batching system, developed vacuum nature oxygen decarbonization process, carried out the refining procedure slagging regime, the deoxidation system, desulfurization and vacuum processing technique research, design requirements of high-grade pipe line composition of steel and internal soundness specified requirement have been reached, Foamed Slag Technique has improved the thermo-efficiency of electric arc, improved the dephosphorization condition at fusing initial stage, the present invention all uses preprocessed molten iron different with present domestic converter steel factory, for reducing Ni in the molten steel, Cr, impurity contents such as Cu, the electric furnace batching should preferentially be used heating molten steel (pig iron), so just reduce the steel scrap consumption, reduced production cost.
Experimental results show that, adopt method of the present invention to smelt pipe line steel and can reach this steel design mix, inclusion grading index fully, its every performance index of pipe line steel of the present invention maintain the leading position at home, reach or approaching external advanced level, with this steel plate and be equipped with rational tube-making process, can produce the fine UOE.The present invention can realize that the steel scrap resource optimization uses, and has enlarged the electric steel kind; Can accurately control endpoint carbon content and oxygen level after vacuum; And by taking to decide the oxygen measure, reduce the reductor consumption to greatest extent, solved the category-B inclusion problem that exceeds standard; By research, when deoxidation is good, can reach the purpose of desulfurization task synchronously to the refining slagging process; Handle by calcium, effectively controlled inclusion morphology and size.The present invention handles by secondary vacuum and to the research of vacuum process argon flow amount control, has strengthened to degas, go to be mingled with effect, has improved the molten steel purity.The pipe line steel that adopts method of the present invention to produce will be widely used in making gas pipeline and build required straight-line joint submerged arc welding tube.Electric furnace steel mill adopts method of the present invention will break the monopoly position of converter steel in this field.
The present invention is simple to operate, and convenient feasible, each electric furnace steel mill all can implement at home, and the steel grade of particular requirements such as similar soft steel of electric furnace steel mill smelting stove and control inclusion content of steel is had great importance.
Embodiment
Embodiment 1
The batching of present embodiment is 12 tons of 15 tons+sponge iron of the 65 tons+pig iron of heating molten steel, 8 tons+high-quality steel scrap, 48 minutes electrosmelting cycles, and tapping [C]: 0.06%, [P]: 0.007%, 1618 ℃ of tapping temperatures; A vacuum predetermination oxygen 500ppm, open vacuum pump and destroyed sampling analysis [C] in 12 minutes: 0.02%, decide oxygen 50ppm, feed aluminium 1.2Kg/t steel, add ferrosilicon 0.5Kg/t steel; Refining cycle 65 minutes is got the slag specimen analysis and is mainly consisted of CaO:52.57%, SiO
2: 9.67%, Al
2O
3: 19.19%, MgO:7.85%, refining is finished, and the sampling main component is [C]: 0.04%, [Si]: 0.14%, [A1]: 0.014%, decide oxygen 10ppm; Feed aluminum steel 180m before the vacuum, silico-calcium 0.8Kg/t steel, CaO 2.8Kg/t steel, finished product [C] 0.04%, [Si] 0.26%, [A1] 0.034%, steel plate analysis [H] 1.2ppm, [0] 12ppm, [N] 60ppm, the inclusion grading: the category-A inclusion is 0; The category-B inclusion is 1.5; The C type impurity is 0; The D type impurity is less than 1.0.Other mechanical property also satisfies the steel grade design requirements fully.
Embodiment 2
The batching of present embodiment is 10 tons of 25 tons+sponge iron of the 60 tons+pig iron of heating molten steel, 5 tons+high-quality steel scrap; 52 minutes electrosmelting cycles, tapping [C]: 0.04%, [P]: 0.008%, 1622 ℃ of tapping temperatures; A vacuum predetermination oxygen 1000ppm adds carbon dust 0.05Kg/t steel, opens vacuum pump and destroys sampling analysis [C] in 12 minutes: 0.01%, decide oxygen 70ppm, and feed aluminium 1.3Kg/t steel, add ferrosilicon 0.5Kg/t steel; Refining cycle 62 minutes is got the slag specimen analysis and is mainly consisted of CaO:53.21%, SiO
2: 8.56%, Al
2O
3: MgO:6.87% 18.76%,, it is [C] that the sampling main component is finished in refining: 0.02%, [Si]: 0.12%, [A1]: 0.011%, decide oxygen 15ppm; Feed aluminum steel 200m before the vacuum, silico-calcium 1.2Kg/t steel, the CaO2.8Kg/t steel, finished product [C]: 0.03%, [Si]: 0.25%, [A1]: 0.030%, steel plate analysis [H]: 1.5ppm, [O]: 15ppm, [N]: 70ppm, the inclusion grading: the category-A inclusion is 0; The category-B inclusion is 1.8; The C type impurity is 0; The D type impurity is less than 1.0.Other mechanical property also satisfies the steel grade design requirements fully.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1, a kind of electric furnace smelting method of high-grade pipe line steel, it is characterized in that, may further comprise the steps: get the heating molten steel that weight content is 60%-70%, the pig iron of 5%-10%, the steel scrap of 15%-30% and the sponge iron of 5%-20% and prepare burden, the material for preparing is sent into electric furnace smelt, smelting cycle is 45-55 minute; Eaf process adopts Foamed Slag Technique, and the formation condition of foamy slag is basicity R=1.8-2.2, FeO 25%-35%, CaO 35%-45%, SiO
218%-22%, oxygen flow 3000-4000Nm
3/ h, the tapping condition is [C] 0.04-0.08%; Liquid steel temperature is not less than 1620 ℃ in [P]≤0.008%, ladle; Carry out the decarburization of vacuum nature oxygen then, behind the electric furnace steel tapping, rich oxygen level in the steel, under vacuum state with steel in carbon react, decarbonization rate is per minute 0.005%-0.008%, reaches the target value of terminal point [C] content≤0.02%; Send into the LF refining furnace then and carry out the refining slag making, the total quantity of slag of refining process is controlled at more than the 20kg/t steel, and CaO content is controlled between the 50%-55% in the slag, SiO in the slag
2Content is controlled between the 5%-10%, Al in the slag
2O
3Content is controlled between the 20%-30%, refining slag basicity is controlled between the 2.5-3.5, and its dual alkalinity is controlled between the 5-7, adds reductor and carries out deoxidation, and argon flow amount is controlled at 300L/min, in 20 minutes, add electrolytic manganese, when temperature rises to 1600 ℃, under the good situation of deoxidation, can finish 90% desulfurization task synchronously, in the refining later stage, argon flow amount is reduced to 100L/min, adds ferrosilicon powder and lime on a small quantity; Carry out vacuum-treat then, again through continuous casting working procedure get final product finished product.
2, the electric furnace smelting method of high-grade pipe line steel according to claim 1 is characterized in that, described reductor is aluminum steel, aluminium powder, aluminium calcium or ferrosilicon powder.
3, the electric furnace smelting method of high-grade pipe line steel according to claim 1, it is characterized in that, the top slag operation is adopted in described vacuum-treat, require all alloys and auxiliary material before vacuum, once to add, the complete part refining slag that removes of refining, add the CaO amount before the vacuum greater than the 2kg/t steel, the total quantity of slag of vacuum process is greater than the 12kg/t steel, keep still having stronger desulfurization in the vacuum process, absorption is mingled with effect, add silico-calcium 0.5-1.2kg/t steel according to [Si] content in the steel before the vacuum, make finished product [Ca] content be not less than 0.0015%, aluminum steel is once feeding before vacuum, do not allow after vacuum, to add any alloy and auxiliary material, the vacuum process argon flow amount according to " first big after small " control, promptly press 100L/min → 80L/min → 60L/min control.
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|---|---|---|---|
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| US8105415B2 (en) * | 2008-08-04 | 2012-01-31 | Nucor Corporation | Low cost making of a low carbon, low sulfur, and low nitrogen steel using conventional steelmaking equipment |
| MY152973A (en) * | 2008-08-04 | 2014-12-15 | Bluescope Steel Ltd | Low cost making of a low carbon, low sulfur, and low nitrogen steel using conventional steelmaking equipment |
| CN102220452B (en) * | 2011-06-13 | 2012-10-31 | 武汉钢铁(集团)公司 | Method for duplex dephosphorization of intermediate frequency furnace and vacuum induction furnace |
| CN102268512B (en) * | 2011-07-08 | 2013-06-26 | 攀钢集团有限公司 | Control method of inclusions in steel |
| CN102534112B (en) * | 2012-02-01 | 2014-07-16 | 江苏省沙钢钢铁研究院有限公司 | Electric furnace full-blowing steelmaking method |
| CN103451368B (en) * | 2012-06-04 | 2016-07-06 | 北大方正集团有限公司 | A kind of method that steel is carried out desulfurization |
| CN106319147B (en) * | 2015-06-30 | 2019-03-26 | 上海梅山钢铁股份有限公司 | LF furnace desulfurization control carbon protects nitrogen control method |
| CN106916919B (en) * | 2017-04-20 | 2019-06-14 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method for controlling stainless steel inclusions |
| US11047015B2 (en) | 2017-08-24 | 2021-06-29 | Nucor Corporation | Manufacture of low carbon steel |
| CN108642226A (en) * | 2018-05-28 | 2018-10-12 | 中冶南方工程技术有限公司 | Electric furnace duplex smelts sponge iron process for extracting vanadium |
| CN108715912B (en) * | 2018-06-07 | 2020-09-22 | 舞阳钢铁有限责任公司 | Method for smelting low-nitrogen steel by electric furnace |
| CN109097525B (en) * | 2018-08-30 | 2020-09-29 | 舞阳钢铁有限责任公司 | Smelting method of high-cleanness chromium-molybdenum steel |
| CN112011668B (en) * | 2020-08-30 | 2021-11-12 | 中南大学 | A production process for improving desulfurization efficiency in EAF-LF molten steel refining process |
| CN112961961B (en) * | 2021-02-08 | 2022-11-18 | 首钢集团有限公司 | Method for producing ultra-low sulfur steel by adopting LF + VD duplex process |
| CN114182063B (en) * | 2021-12-13 | 2023-03-17 | 商丘市商鼎耐火材料有限公司 | A method of using a deoxidizer using aluminum ash as a raw material for refining |
| CN114790504A (en) * | 2022-04-02 | 2022-07-26 | 张家港广大特材股份有限公司 | Deoxidation slagging process and steelmaking method adopting same |
| CN116140356A (en) * | 2022-12-23 | 2023-05-23 | 舞阳钢铁有限责任公司 | A production method for rolling ultra-wide chromium-molybdenum steel plates with flaw detection steel ingots |
| CN117070861A (en) * | 2023-10-07 | 2023-11-17 | 江苏良工精密合金钢有限公司 | An extremely low-oxygen, high-ultra-pure austenitic stainless steel and its preparation process |
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