CN103642970B - A kind of smelting process of carbon aluminium-killed steel - Google Patents

A kind of smelting process of carbon aluminium-killed steel Download PDF

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CN103642970B
CN103642970B CN201310660351.0A CN201310660351A CN103642970B CN 103642970 B CN103642970 B CN 103642970B CN 201310660351 A CN201310660351 A CN 201310660351A CN 103642970 B CN103642970 B CN 103642970B
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steel
ladle
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CN103642970A (en
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周伟
曾建华
陈永
干雄
陈亮
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Abstract

The invention provides a kind of smelting process of carbon aluminium-killed steel, comprise the following steps: (1) molten steel just refines; (2) deoxidation is not carried out to molten steel in tapping process; High carbon ferromanganese is added during tapping; Tapping process steel ladle full Argon; The backward ladle top of the slag of having tapped adds ladle slag modification agent and carries out modification to ladle slag; (3) molten steel after process is made to enter vacuum station; Add carbonaceous material in batches and carry out carbon deoxidation, carry out after oxygen activity being controlled to below 50ppm adding aluminium final deoxygenation and alloy fine setting, molten steel is set off; (4) add ladle slag modification agent to ladle and modification is carried out to ladle slag.Ensure that bof process is stablized, the ability of low cost production carbon aluminium-killed steel improves molten steel cleanness by the smelting process of carbon aluminium-killed steel provided by the invention simultaneously, there is good economic benefit.

Description

A kind of smelting process of carbon aluminium-killed steel
Technical field
The invention belongs to field of iron and steel smelting, particularly relate to a kind of smelting process of carbon aluminium-killed steel.
Background technology
In recent years, along with the fast development of China's Iron And Steel Industry, production capacity surplus, easy contradiction highlight day by day, and the whole industry is all faced with the severe challenge that low profit is even lost.Especially 2008 start, and by the impact of international financial crisis, domestic iron and steel enterprises faces unprecedented severe viability test.Thus, cost control is in the status ever more important of steel industry.
In existing patent documentation, production method for carbon aluminium-killed steel has been reported, patent documentation 1(CN102134628, title: a kind of carbon aluminium-killed steel smelting process of low silicon content) in disclose a kind of production method of carbon aluminium-killed steel of low silicon content.This technical scheme is before blast furnace vanadium-bearing hot metal enters steel making working procedure, first through vanadium extraction, desiliconization treatment process, steel making working procedure adopts semi-steel making, molten steel is in slag-stopping tapping and deoxidation, the pre-deoxidation of low silicon pre-molten composite refining slag is added in alloying process, after molten steel enters LF refining procedure, conventional lower electrode is not adopted to heat the mode making white slag, but adopt buckle closure insulation, under the reducing atmosphere that Argon stirs, make reductor with aluminium powder make white slag rapidly, proceed to Calcium treatment and soft blow argon subsequently, under the prerequisite ensureing refining qualities, inhibit molten steel to return the thermodynamics and kinetics condition of silicon, after molten steel soft blow argon terminates, enter continuous casting working procedure.This technology makes low silicon, carbon aluminium-killed steel Si elemental composition qualification rate reaches more than 98%, owing to eliminating refining heated by electrodes process, has less energy-consumption, environmental protection, feature that production cost is low.
In addition, patent documentation 2(CN102051435, title: the method for smelting low carbon aluminium killed steel and the method for continuous casting carbon aluminium-killed steel) in disclose a kind of production method of carbon aluminium-killed steel, comprising the steps: to use converter top bottom blowing to carry out just refining, then tapping in ladle by just refining the molten steel obtained; Pushing off the slag and pre-deoxidation is carried out in tapping process, pushing off the slag makes the total content of FeO and MnO entering ladle be the 3-5 % by weight of the amount of the molten steel entered in ladle, described pre-deoxidation for add ferro-aluminum reductor in molten steel, and described pre-deoxidation makes the oxygen level of molten steel be 10-100ppm; Carry out refining to the molten steel in ladle after tapping before, carry out once feeding aluminium to the molten steel in ladle; Carry out refining to the molten steel after described once hello aluminium and carry out secondary when refining feeding aluminium; Remove the inclusion swum on liquid steel level.Further, patent documentation 2 also provides a kind of method of continuous casting carbon aluminium-killed steel, and the method by smelting low carbon aluminium killed steel of the present invention is smelted the pouring molten steel obtained and moved and cooling to be pulled continuously to crystallizer by the method.Use the method for the smelting low carbon aluminium killed steel of this technology can significantly improve the purity of molten steel and reduce continuous casting dross.
But the technology that above-mentioned patent documentation relates to all does not relate to vacuum-treat pattern and utilizes the cost of aforesaid method high.
Summary of the invention
One or more in order in solving the problem, the invention provides a kind of smelting process of carbon aluminium-killed steel, comprise the following steps: (1), with the half steel after hot metal containing V-Ti vanadium extraction desulfurization for raw material, described half steel being joined just refining in top and bottom combined blown converter is molten steel; When molten steel just being refined C content is 0.038 ~ 0.048wt%, Mn content is 0.019 ~ 0.025wt%, P content is 0.0055 ~ 0.0076wt%, S content is 0.010 ~ 0.018wt%, Si content is 0.012 ~ 0.005%, temperature is 1680 ~ 1695 DEG C, starting pushing off the slag and tapping to ladle.(2) deoxidation is not carried out to molten steel in tapping process; High carbon ferromanganese is added during tapping; Tapping process steel ladle full Argon; The backward ladle top of the slag of having tapped adds ladle slag modification agent and carries out modification to ladle slag.(3) molten steel after step (2) process is made to enter vacuum station; Add carbonaceous material in batches and carry out carbon deoxidation, add aluminium after oxygen activity being controlled to below 50ppm and carry out final deoxygenation and alloy fine setting, molten steel is set off.(4), after described step (3) terminates, add ladle slag modification agent to ladle and modification is carried out to ladle slag.
Wherein, in above-mentioned steps (1), when first steel-making water, be heated to 1500 ~ 1600 DEG C in advance by described ladle.
Wherein, in above-mentioned steps (2), described high carbon ferromanganese is FeMn74C7.5.
Wherein, in above-mentioned steps (1), the addition of half steel is 220 ~ 245 tons; In above-mentioned steps (2), the add-on of described high carbon ferromanganese is 625 ~ 635kg/ stove, and the add-on of described ladle slag modification agent is 190 ~ 210kg/ stove.
Wherein, above-mentioned steps (2) also comprises: the fluorite of the quickened lime and 0.8 ~ 1.0kg/ ton steel that add 4 ~ 5kg/ ton steel after tapping 2/3 in ladle carries out wash heat.
Wherein, in above-mentioned steps (3), the inlet temperature of molten steel is 1635 ~ 1650 DEG C.
Wherein, in above-mentioned steps (3), described carbonaceous material is refinery coke, and the add-on often criticized is within 35kg.
Wherein, in above-mentioned steps (3), vacuum degree control is below 300mbar.
Wherein, in above-mentioned steps (4), the add-on of ladle slag modification agent is 200 ~ 300kg; Out-station temperature after vacuum-treat is 1585 ~ 1595 DEG C.
Carbon aluminium-killed steel of the present invention can be Stb32, and wherein, C content is 0.02 ~ 0.07wt%, Si content is below 0.03wt%, Mn content is 0.15 ~ 0.25wt%, Als content is 0.020 ~ 0.060wt%.
Ensure that bof process is stablized, the ability of low cost production carbon aluminium-killed steel improves molten steel cleanness by the smelting process of carbon aluminium-killed steel provided by the invention simultaneously, there is good economic benefit.
Embodiment
Below the smelting process of carbon aluminium-killed steel according to the present invention is described in detail.In addition, do not have the step described in detail to be prior art in the present invention, do not repeat them here.
The invention provides a kind of smelting process of carbon aluminium-killed steel, comprise the following steps: (1) molten steel just refines; (2) tap; (3) vacuum-treat; (4) modification.
Specifically, in step (1), with the half steel after hot metal containing V-Ti vanadium extraction desulfurization for raw material, 220 ~ 245 tons of described half steels being joined just refining in top and bottom combined blown converter is molten steel; When molten steel just being refined C content is 0.038 ~ 0.048wt%, Mn content is 0.019 ~ 0.025wt%, P content is 0.0055 ~ 0.0076wt%, S content is 0.010 ~ 0.018wt%, Si content is 0.012 ~ 0.005%, temperature is 1680 ~ 1695 DEG C, starting pushing off the slag and tapping to ladle.
Ladle is heated to the ladle of 1500 ~ 1600 DEG C in advance.Its reason is, contains molten steel ladle through strict fully baking, tapping process temperature drop can be avoided excessive.
In step (2), in tapping process, deoxidation is not carried out to molten steel; High carbon ferromanganese is added during tapping; Tapping process steel ladle full Argon, to ensure that ladle bottom blowing is unobstructed; The backward ladle top of the slag of having tapped adds ladle slag modification agent and carries out modification to ladle slag.
High carbon ferromanganese is preferably FeMn74C7.5.In addition, the add-on of high carbon ferromanganese is 625 ~ 635kg/ stove, is particularly preferably 630kg/ stove (selecting this add-on can control Mn composition in steel in more reasonably scope, with addition of more ferromanganese to regulate and control composition Mn after avoiding RH process to terminate).The add-on of ladle slag modification agent is 190 ~ 210kg/ stove, is particularly preferably 200kg/ stove (if add-on exceedes this this scope, just larger to steel liquid deoxidation degree, to can not meet the requirement (300ppm) of RH carbon deoxygenation to molten steel oxygen activity).In addition, above-mentioned steps (2) also comprises: the fluorite of the quickened lime and 0.8 ~ 1.0kg/ ton steel that add 4 ~ 5kg/ ton steel after tapping 2/3 in ladle carries out wash heat.Ladle slag modification agent in step (2): can following composition: SiO be contained by percentage to the quality 2≤ 7.0%, CaO:40.0 ~ 60.0%, Al 2o 3: 20.0 ~ 30.0%, MAl:6% ~ 10.0%, all the other are CaF 2and S, P, TiO 2.
In step (3), the molten steel after step (2) process is made to enter vacuum station; Add carbonaceous material in batches and carry out carbon deoxidation, carry out after oxygen activity being controlled to below 50ppm adding aluminium final deoxygenation and alloy fine setting, molten steel is set off.
The inlet temperature of molten steel is 1635 ~ 1650 DEG C, and its reason is, carbon deoxidation temperature drop is generally about 35 DEG C, and its out-station temperature meets 1585 ~ 1595 DEG C to select this temperature range to ensure.Carbonaceous material can be refinery coke, and the vacuum thermometric that enters the station determines oxygen.Carbon deoxidation operation can be carried out according to end point carbon and the vacuum oxygen activity that enters the station.Concrete carbonaceous material add-on can see table 4.The feed postition of carbonaceous material preferably enters the station and adds first, then often adds next batch after circulation 1min, often criticizes overall control within 35kg.Vacuum degree control can carry out determining oxygen within 300mbar after 3min (grown place normal atmosphere is about 800mbar, and carbon deoxidation total time can control within 12min.Wherein, vacuum tightness drops to 300mbar needs 4min, and vacuum tightness≤300mbar time is about about 8min), as oxygen activity >=50ppm, proceed carbon deoxidation operation.Carbon deoxidation treatment terminates rear thermometric, determines oxygen, then carries out aluminium final deoxygenation and alloy fine setting.
In step (4), after step (3) terminates, add ladle slag modification agent to ladle and modification is carried out to ladle slag.
The add-on of ladle slag modification agent is preferably 200 ~ 300kg.Out-station temperature after vacuum-treat is 1585 ~ 1595 DEG C.Ladle slag modification agent in step (4) can contain following composition: SiO by percentage to the quality 2≤ 7.0%, CaO:40.0 ~ 60.0%, Al 2o 3: 15.0 ~ 25.0%, MAl:10.0% ~ 20.0%, all the other are CaF 2and S, P, TiO 2.
Below in conjunction with the smelting process further instruction of specific embodiment to carbon aluminium-killed steel of the present invention, but the smelting process of carbon aluminium-killed steel of the present invention is not limited thereto.In addition, if no special instructions, the per-cent used in the present invention is all weight percentage; The units/kg used in the present invention/ton steel refers to the addition (kg) in steel per ton.
The steel grade smelted in embodiment 1 ~ 3 is Stb32, and component requirements is in table 1:
Table 1Stb32 chemical composition/%
C Si Mn Als
0.02~0.07 ≤0.03 0.15~0.25 0.020~0.060
Wherein, Als represents the acid-soluble aluminum content in steel.
embodiment 1
With the half steel after hot metal containing V-Ti vanadium extraction desulfurization for raw material carries out just making steel water, wherein, this half steel comprise by weight percentage 3.6% C, 0.04% Mn, P, the S of 0.010% of 0.068%, Cr, Si and Ti of the V of 0.035% and tracer level, surplus is iron and inevitable impurity.
Concrete steps:
(1) 230 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 220 tons (nominal capacities), utilize the function of top and bottom combined blown converter oxygen decarburization to be smelt molten steel by the beginning of above-mentioned half steel.When just to refine C content be 0.041wt%, Mn content to molten steel be 0.023wt%, P content be 0.0064wt%, S content be 0.012wt%, Si content is 0.007%, temperature is 1685 DEG C, start pushing off the slag and tap in ladle; The ladle after fully toasting is adopted to contain molten steel, tap 221t.
(2) tapping process not deoxidation; Tapping quantitatively adds 630kg/ stove high carbon ferromanganese (FeMn74C7.5); Tapping process steel ladle full Argon; The fluorite of the quickened lime and 0.82kg/ ton steel that add 4.1kg/ ton steel after tapping 2/3 in ladle carries out wash heat.Add 200kg ladle slag modification agent to the ladle top of the slag after having gone out steel and modification is carried out to ladle slag.
(3) above-mentioned molten steel is delivered to vacuum, thermometric, determine oxygen and sampling.Temperature is 1638 DEG C, and oxygen activity is 300ppm.According to end point carbon and the oxygen activity situation that enters the station, the actual add-on of control parameters table table 4(and table have nuance, and as this stove steel, tap is 221t.Reference table adds by 0.44kg/t steel, calculated amount is 97.4kg, and add-on is 100, and general add-on is slightly higher than calculated amount, to ensure deoxidation effect, in general, be advisable with exceed calculated amount 1% ~ 5%) enter the station thermometric sampling after add first carbonaceous material (that is, refinery coke, carbon >=99.4%) 25kg, carry out carbon deoxidation, then add a collection of refinery coke every 1min, divide 4 100kg altogether.Vacuum tightness carries out determining oxygen after 300mbar process 3min, and oxygen activity is 34ppm, carries out adding aluminium final deoxygenation.Then trimming is carried out according to the composition that enters the station.Composition assay: C:0.03wt%, Si:0.01wt%, Mn:0.20wt%, Als:0.03wt%, surplus is iron and inevitable impurity.
(4) vacuum-treat terminates rear temperature is 1590 DEG C, and process terminates backward ladle and adds 200kg ladle slag modification agent.Then sending continuous casting to obtain section is the strand of 230 × 1800mm.Detect strand, contrast with existing technique, design parameter is in table 2.
Obtained carbon aluminium-killed steel composition is in table 3, and surplus is iron and inevitable impurity.
embodiment 2
With the half steel after hot metal containing V-Ti vanadium extraction desulfurization for raw material carries out just making steel water, wherein, this half steel comprise by weight percentage 3.6% C, 0.03% Mn, P, the S of 0.011% of 0.058%, Cr, Si and Ti of the V of 0.038% and tracer level, surplus is iron and inevitable impurity.
Concrete steps:
(1) 235 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 220 tons (nominal capacities), utilize the function of top and bottom combined blown converter oxygen decarburization to be smelt molten steel by the beginning of above-mentioned half steel.When just to refine C content be 0.045wt%, Mn content to molten steel be 0.022wt%, P content be 0.0074wt%, S content be 0.015wt%, Si content is 0.007%, temperature is 1688 DEG C, start pushing off the slag and tap in ladle; Adopt the ladle after fully toasting to contain molten steel, tap is 218t.
(2) tapping process not deoxidation; Tapping quantitatively adds 630kg/ stove high carbon ferromanganese (FeMn74C7.5); Tapping process steel ladle full Argon; The fluorite of the quickened lime and 0.83kg/ ton steel that add 4.2kg/ ton steel after tapping 2/3 in ladle carries out wash heat.Add 200kg ladle slag modification agent to the ladle top of the slag after having gone out steel and modification is carried out to ladle slag.
(3) above-mentioned molten steel is delivered to vacuum, thermometric, determine oxygen and sampling.Temperature is 1641 DEG C, and oxygen activity is 320ppm.According to end point carbon and the oxygen activity situation that enters the station, control parameters table table 4(parameter list adopts C:0.04, oxygen activity 350ppm, calculated value is 218*0.5=109) enter the station thermometric sampling after add first carbonaceous material (refinery coke, carbon >=99.4%) 25kg, carry out carbon deoxidation, then add a collection of refinery coke every 1min, divide and add 110kg altogether 4 times.Vacuum tightness carries out determining oxygen after 300mbar process 3min, and oxygen activity is 36ppm, carries out adding aluminium final deoxygenation.Then trimming is carried out according to the composition that enters the station.Composition assay: C:0.02wt%, Si:0.01wt%, Mn:0.21wt%, Als:0.04wt%, surplus is iron and inevitable impurity.
(4) vacuum-treat terminates rear temperature is 1593 DEG C, and process terminates backward ladle and adds 250kg ladle slag modification agent.Then sending continuous casting to obtain section is the strand of 230 × 1800mm.Detect strand, contrast with existing technique, design parameter is in table 2.
Obtained carbon aluminium-killed steel composition is in table 3, and surplus is iron and inevitable impurity.
embodiment 3
With the half steel after hot metal containing V-Ti vanadium extraction desulfurization for raw material carries out just making steel water, wherein, this half steel comprises the V of S, 0.035wt% of P, 0.012wt% of Mn, 0.066wt% of C, 0.04wt% of 3.5wt% and Cr, Si and Ti of tracer level by weight percentage, and surplus is iron and inevitable impurity.
Concrete steps:
(1) 238 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 220 tons (nominal capacities), utilize the function of top and bottom combined blown converter oxygen decarburization to be smelt molten steel by the beginning of above-mentioned half steel.When just to refine C content be 0.041wt%, Mn content to molten steel be 0.022wt%, P content be 0.0062wt%, S content be 0.016wt%, Si content is 0.01%, temperature is 1687 DEG C, start pushing off the slag and tap in ladle; The ladle after fully toasting is adopted to contain molten steel.
(2) tapping process not deoxidation; Tapping quantitatively adds 630kg/ stove high carbon ferromanganese (FeMn74C7.5); Tapping process steel ladle full Argon; The fluorite of the quickened lime and 0.87kg/ ton steel that add 4.3kg/ ton steel after tapping 2/3 in ladle carries out wash heat.Add 200kg ladle slag modification agent to the ladle top of the slag after having gone out steel and carry out modification to ladle slag, tap is 220t.
(3) above-mentioned molten steel is delivered to vacuum, thermometric, determine oxygen and sampling.Temperature is 1637 DEG C, and oxygen activity is 340ppm.According to end point carbon and the oxygen activity situation that enters the station, control parameters table table 4(parameter list adopts C:0.04, oxygen activity 350ppm, calculated value is 220*0.5=110, be ensure deoxidation effect, slightly improve on this basis its amount) enter the station thermometric sampling after add first carbonaceous material (refinery coke, carbon >=99.4%) 25kg, carry out carbon deoxidation, then add a collection of refinery coke every 1min, divide and add 115kg altogether 4 times.Vacuum tightness carries out determining oxygen after 300mbar process 3min, and oxygen activity is 42ppm, carries out adding aluminium final deoxygenation.Then trimming is carried out according to the composition that enters the station.Composition assay: C:0.04wt%, Si:0.01wt%, Mn:0.18wt%, Als:0.045wt%, surplus is iron and inevitable impurity.
(4) vacuum-treat terminates rear temperature is 1587 DEG C, and process terminates backward ladle and adds 250kg ladle slag modification agent.Then sending continuous casting to obtain section is the strand of 230 × 1800mm.Detect strand, contrast with existing technique, design parameter is in table 2.
Obtained carbon aluminium-killed steel composition is in table 3, and surplus is iron and inevitable impurity.
Table 2 strand T [O], N control situation
Table 3Stb32 finished product Composition Control situation/%
C Si Mn Als
Embodiment 1 0.03 0.01 0.20 0.025
Embodiment 2 0.02 0.01 0.21 0.035
Embodiment 3 0.04 0.01 0.21 0.04
From table, under adopting the condition of present method, the high chromium steel Stb32 of production fullys meet set objective requirement.Meanwhile, its T [O], N level of control are all higher than common process.
Table 4 carbon deoxidation carbonaceous material adds reference table/kg/t steel
By the smelting process of carbon aluminium-killed steel of the present invention, through the laggard RH light treatment mode of chain-wales Argon process after employing converter tapping, while having saved deoxidized aluminium consumption, deoxidation products can also be reduced.The method, compared with the production model of conventional carbon aluminium-killed steel, also improves molten steel cleanness while cost-saving.
Although illustrate and describe the present invention particularly with reference to exemplary embodiment of the present invention, but those skilled in the art will appreciate that, when do not depart from as claims and they equivalent limit the spirit and scope of the present invention, the various changes in form and details can be made at this.Object only in descriptive meaning instead of for restriction should consider embodiment.Therefore, scope of the present invention is not limited by the specific embodiment of the present invention, but is limited by claims, and all differences within the scope of this will be interpreted as comprising in the present invention.

Claims (10)

1. a smelting process for carbon aluminium-killed steel, is characterized in that, comprises the following steps:
(1) with the half steel after hot metal containing V-Ti vanadium extraction desulfurization for raw material, described half steel being joined in top and bottom combined blown converter just refining is molten steel; When molten steel just being refined C content is 0.038 ~ 0.048wt%, Mn content is 0.019 ~ 0.025wt%, P content is 0.0055 ~ 0.0076wt%, S content is 0.010 ~ 0.018wt%, Si content is 0.012 ~ 0.005%, temperature is 1680 ~ 1695 DEG C, starting pushing off the slag and tapping to ladle;
(2) deoxidation is not carried out to molten steel in tapping process; High carbon ferromanganese is added during tapping; Tapping process steel ladle full Argon; The backward ladle top of the slag of having tapped adds ladle slag modification agent and carries out modification to ladle slag, and wherein, described ladle slag modification agent is by percentage to the quality containing following composition: SiO 2≤ 7.0%, CaO:40.0 ~ 60.0%, Al 2o 3: 20.0 ~ 30.0%, MAl:6% ~ 10.0%, all the other are CaF 2and S, P, TiO 2;
(3) molten steel after step (2) process is made to enter vacuum station; Add carbonaceous material in batches and carry out carbon deoxidation, add aluminium after oxygen activity being controlled to below 50ppm and carry out final deoxygenation and alloy fine setting, molten steel is set off;
(4), after described step (3) terminates, add ladle slag modification agent to ladle and modification is carried out to ladle slag.
2. method according to claim 1, is characterized in that, in step (1), when first steel-making water, described ladle is heated to 1500 ~ 1600 DEG C in advance.
3. method according to claim 1, is characterized in that, in step (2), described high carbon ferromanganese is FeMn74C7.5.
4. method according to claim 3, is characterized in that, in step (1), the addition of half steel is 220 ~ 245 tons; In step (2), the add-on of described high carbon ferromanganese is 625 ~ 635kg/ stove, and the add-on of described ladle slag modification agent is 190 ~ 210kg/ stove.
5. method according to claim 4, is characterized in that, step (2) also comprises: the fluorite of the quickened lime and 0.8 ~ 1.0kg/ ton steel that add 4 ~ 5kg/ ton steel after tapping 2/3 in ladle carries out wash heat.
6. method according to claim 4, is characterized in that, in step (3), the inlet temperature of molten steel is 1635 ~ 1650 DEG C.
7. method according to claim 4, is characterized in that, in step (3), described carbonaceous material is refinery coke, and the add-on often criticized is within 35kg.
8. method according to claim 4, is characterized in that, in step (3), vacuum degree control is below 300mbar.
9. method according to claim 4, is characterized in that, in step (4), the add-on of ladle slag modification agent is 200 ~ 300kg; Out-station temperature after vacuum-treat is 1585 ~ 1595 DEG C.
10. by the method described in any one in claim 1 to 9, it is characterized in that, described carbon aluminium-killed steel is Stb32, and wherein, C content is 0.02 ~ 0.07wt%, Si content is below 0.03wt%, Mn content is 0.15 ~ 0.25wt%, Als content is 0.020 ~ 0.060wt%.
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CN103045930A (en) * 2013-01-06 2013-04-17 唐山建龙实业有限公司 Deoxidation alloying production process for low-carbon aluminum killed steel

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101457281A (en) * 2009-01-07 2009-06-17 攀钢集团研究院有限公司 RH decarburization method during ultra-low-carbon steel production process by revolving furnace
CN101760581A (en) * 2009-12-30 2010-06-30 首钢总公司 Production process for smelting high-level low-carbon steel at low cost
CN102312037A (en) * 2010-07-06 2012-01-11 攀钢集团钢铁钒钛股份有限公司 Steelmaking and slagging method
CN103045930A (en) * 2013-01-06 2013-04-17 唐山建龙实业有限公司 Deoxidation alloying production process for low-carbon aluminum killed steel

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