CN103898275A - Refining method for enhancing cleanliness of steel - Google Patents
Refining method for enhancing cleanliness of steel Download PDFInfo
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- CN103898275A CN103898275A CN201210585841.4A CN201210585841A CN103898275A CN 103898275 A CN103898275 A CN 103898275A CN 201210585841 A CN201210585841 A CN 201210585841A CN 103898275 A CN103898275 A CN 103898275A
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Abstract
The invention discloses a refining method for enhancing cleanliness of steel, which comprises the following steps: tapping molten steel obtained by converter smelting into a ladle, carrying out LF (ladle furnace) refining and casting, wherein pre-deoxidation alloying and desulfurization with high-basicity refining slag are performed in the tapping process, and a low-aluminum slag modifier is adopted to modify the ladle top slag after the tapping finishes. The LF refining process comprises the following steps: sending the ladle into the LF, adding the high-basicity refining slag, low-aluminum slag modifier and aluminum shots into the molten steel in batches while blowing argon into the molten steel in the ladle, wherein the Als content in the molten steel is controlled at 0.03-0.05 wt% in the LF refining process. In the continuous casting billet obtained by the method, the sulfur content is less than or equal to 0.003%, the inclusion indexes are respectively less than or equal to Grade 1.5, and T[O] is less than or equal to 20*10<-6>.
Description
Technical field
The present invention relates to a kind of for improving the method for refining of cleanliness factor of steel.
Background technology
External refining is that the molten steel refining in converter, open hearth or electric furnace is transferred to the process that in another container, (being mainly ladle) carries out refining.External refining is divided into just refining and two steps of refining traditional steelmaking process.Wherein, just refining is fusing, dephosphorization, decarburization and the master alloying that carries out furnace charge under oxidizing atmosphere; Refining is under vacuum, inert atmosphere or controlled atmosphere, to carry out that deoxidation, desulfurization, removal are mingled with, inclusion modification, fine setting composition, control liquid steel temperature etc.
At present, common secondary refining method comprises that the ladle of ladle envelope electric-arc heating blows Ar stove (, LF stove) and vacuum circulation degassing processing (, RH processes).Method of refining difference, the technological operation of employing is not identical yet, and the metallurgical effect reaching is also different.
CN1851004A discloses a kind of method of refining of low-silicon low-carbon aluminium full killed steel, and not pretreated molten iron is carried out to low-silicon low-carbon smelting at top and bottom combined blown converter, taps, with the refining of LF stove after endpoint molten steel composition reaches requirement.When starting, refining adds quaternary slag CaO-Al in steel
2o
3-MgO-SiO
21-15kg/t steel, power transmission, omnidistance Argon processing, is 1.5-5.0NL/t steel min for argon intensity, in slag, quaternary basicity is 1.6-3.2, (MgO+FeO)≤0.2-1.0% in slag.In liquid steel refining process, add 0.5-5.0kg/t steel aluminium reducing silicon dioxde reaction inhibitor Al
2o
3, NaAlO
2or Ca (AlO
2)
2, refining time is 25-50min, feeds the front 5-10min of iron calcium and add 1.0-5.0kg/t steel calcium reduction silicon dioxde reaction inhibitor C aO or CaCO in molten steel
3, after power failure, molten steel is carried out to microalloy treatment, on large Baogang water surface, add the low silicon insulating covering agent of carbon-free high alkalinity, send CSP continuous casting and continuous rolling mill.
CN1220316A discloses a kind of molten steel refining technology, and this technique comprises: (1) is left in RH processing station process at RH ladle trolley, carries out end Stirring by Ar Blowing pre-treatment; (2) in RH treating processes, molten steel T[O] when≤20ppm, carry out desulfurization processing to feeding composite desulfate heart yearn in ladle; (3) finish vacuum tank in RH processing and destroy in vacuum, carry out calcium processing to feeding CaSi heart yearn in ladle, or finish, after thermometric sampling, in blowing Ar, to feed immediately CaSi heart yearn and carry out calcium processing in RH processing.
Summary of the invention
The object of the present invention is to provide a kind of new for improving the method for refining of cleanliness factor of steel.The continuously cast bloom obtaining by aforesaid method can reach sulphur≤0.003%, the every grading of inclusion all≤1.5 grades, T[O]≤20 × 10
-6.
In the present invention, described inclusion comprises category-A inclusion, category-B inclusion, C type impurity and the D type impurity in inclusion grading standard GB/T10561-2005.The content of described inclusion is evaluated according to this inclusion grading standard GB/T10561-2005.
The present inventor finds through deep research, in LF refining process, by high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot are added respectively separately several times, and the gradation of preferably controlling high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot adds mode, adds moment and add-on, and to control in refining process Als content in molten steel be 0.03 % by weight～0.05 % by weight, can adjust the content of finished product steel inclusion, can obtain sulphur≤0.003 % by weight, the every grading of inclusion all≤1.5 grades, T[O]≤20 × 10
-6the continuously cast bloom of high-quality, thereby completed the present invention.
; a kind of for improving the method for refining of cleanliness factor of steel; the method comprises that the molten steel that converter smelting is obtained taps in ladle; and carry out the refining of LF stove and casting; in tapping process, carry out pre-deoxidation alloying and adopt high alkalinity refining slag to carry out desulfurization, tapping finishes the low aluminium slag supplying agent of rear employing and carries out the modification of ladle top slag; Wherein, the method of described LF stove refining comprises to be delivered to ladle in LF stove, in the molten steel in ladle, be blown under the condition of argon gas, in molten steel, add several times described high alkalinity refining slag, described low aluminium slag supplying agent and aluminum shot, and control molten steel in LF stove refining process in, Als content is 0.03 % by weight～0.05 % by weight.
According to of the present invention for improving the method for refining of cleanliness factor of steel, can obtain sulphur≤0.003%, the every grading of inclusion all≤1.5 grades, T[O]≤20 × 10
-6the continuously cast bloom of high-quality.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
The method of liquid steel refining of the present invention comprises that the molten steel that converter smelting is obtained taps in ladle, and carry out the refining of LF stove and casting, in tapping process, carry out pre-deoxidation alloying and adopt high alkalinity refining slag to carry out desulfurization, tapping finishes the low aluminium slag supplying agent of rear employing and carries out the modification of ladle top slag; Wherein, the method of described LF stove refining comprises to be delivered to ladle in LF stove (ladle refining furnace), in the molten steel in ladle, be blown under the condition of argon gas, in molten steel, adding several times described high alkalinity refining slag, described low aluminium slag supplying agent and aluminum shot, and the acid-soluble aluminium of Als(control molten steel in LF stove refining process in) content is 0.03 % by weight～0.05 % by weight.
According to of the present invention for improving the method for refining of cleanliness factor of steel, it mainly improves and is LF refining process, in its method to converter smelting, tapping process, carry out the pre-alloyed method of deoxidation, adopt high alkalinity refining slag to carry out the method for desulfurization and tapping to finish the low aluminium slag supplying agent of rear employing and carry out the method for modification of ladle top slag there is no particular limitation, can carry out according to the normally used method in this area.
In the present invention, for example, after the method that deoxidation is carried out in tapping in ladle process can be added in ladle by the molten steel that the described converter smelting of 28-40 % by weight is obtained, add reductor to carry out, the add-on of described reductor can add according to desired endpoint carbon content of converter, described reductor can be ferro-aluminum and/or metallic aluminium, is preferably ferro-aluminum (aluminium content is that 40 % by weight, iron level are that 58 % by weight, surplus are impurity).In the time that described reductor is ferro-aluminum and/or metallic aluminium, can calculate according to following formula with the add-on Q of the reductor of aluminium weighing scale:
Q=0.05*W/[C]；
[C]-endpoint carbon content of converter, % by weight;
The molten steel amount of W-converter tapping, t.
In addition, carry out pre-alloyed method can will enter reductor be added to ladle in after, pre-alloyed by adding various alloys to carry out.Described pre-alloyed middle added alloy can add various alloys according to the requirement of steel grade in molten steel, for example, ferrosilicon, manganeseirom, the add-on of various alloys in pre-alloyed process is as long as at least lower limit content that in guarantee steel, each component concentration requires in steel grade.
In the present invention, for example, in tapping process, adopt high alkalinity refining slag carry out the method for desulfurization can be in the molten steel that the described smelting of 65-75 % by weight is obtained be added to ladle after, in described ladle, add high alkalinity refining slag, after its add-on makes to tap, molten steel sulphur content is controlled at 0.005 % by weight ~ 0.015 % by weight; After preferably making to tap, molten steel sulphur content is controlled at 0.005 % by weight ~ 0.010 % by weight.Under normal circumstances, the add-on of described high alkalinity refining slag can be that 5-7kg/t steel is (at this, in units/kg/t steel, " steel " refers to: the molten steel amount after tapping in ladle), the composition of described high alkalinity refining slag preferably includes the CaO of 65-85 % by weight, the SiO of 1-5 % by weight
2, 1-3 % by weight Al
2o
3, 7-15 % by weight CaF
2mgO with 1-5 % by weight; In addition, also contain a small amount of impurity.
In the present invention, for example, adopting low aluminium slag supplying agent to carry out the method for the modification of ladle top slag can be after tapping finishes, add low aluminium slag supplying agent uniform fold on the ladle top of the slag to the ladle top of the slag, the object of its modification is to reduce equably ladle slag oxidisability, and reduce ladle top slag fusing point, be beneficial to adsorb inclusion content in melting steel; Preferably, the add-on of low aluminium slag supplying agent is 1.5-3kg/t steel; Then carry out argon bottom-blowing, blowing argon gas flow is 0.5-0.8NL/t steel min, controls argon blowing time 0-10min.The composition of described low aluminium slag supplying agent preferably includes the Al of 25-30 % by weight
2o
3, 25-30 % by weight CaO, 20-25 % by weight SiO
2, 5-10 % by weight Al; In addition, also contain a small amount of impurity.
According to the present invention, for can obtain sulphur≤0.003%, the every grading of inclusion all≤1.5 grades, T[O]≤20 × 10
-6the continuously cast bloom of high-quality.Under preferable case, the carbon content in the molten steel that described smelting obtains is that 0.03-0.08 % by weight, sulphur content are 0.005-0.015 % by weight, and tapping temperature is 1640-1700 DEG C.
According to the present invention, in LF refining process, need to add high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot.In LF refining process, the object that adds described high alkalinity refining slag and described low aluminium slag supplying agent is for reducing equably ladle slag oxidisability, and reduces ladle top slag fusing point, is beneficial to adsorb inclusion content in melting steel; The object that adds described aluminum shot is regulate and control the Als content in molten steel and reduce ladle top slag oxidisability.
In the present invention, for can obtain sulphur≤0.003%, the every grading of inclusion all≤1.5 grades, T[O]≤20 × 10
-6the continuously cast bloom of high-quality, adding of described high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot need to be carried out respectively separately several times.Ensureing under the prerequisite of quality of the continuously cast bloom obtaining, in order further to simplify working process, the adding to divide respectively separately of preferred described high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot carries out for 2-5 time.More preferably described high alkalinity refining slag, low aluminium slag supplying agent and adding separately of aluminum shot divide respectively and carry out for 2-3 time.
According to one of the present invention preferred embodiment, divide and add high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot for three times.
According to the present invention, for can obtain sulphur≤0.003%, the every grading of inclusion all≤1.5 grades, T[O]≤20 × 10
-6the continuously cast bloom of high-quality, described high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot add opportunity also extremely important.Under preferable case, above-mentioned preferred embodiment in, be that the refining of LF stove started in rear 1-5 minute the opportunity that adds for the first time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot; Be that the refining of LF stove started in rear 10-15 minute the opportunity that adds for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot; Be that the refining of LF stove starts rear 20-25 minute the opportunity that adds for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, and described LF refining time is 30-45 minute.More preferably be that the refining of LF stove started in rear 1-3 minute the opportunity that adds for the first time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot; Be that the refining of LF stove started in rear 10-12 minute the opportunity that adds for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot; Be that the refining of LF stove starts rear 20-23 minute the opportunity that adds for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, and described LF refining time is 35-40 minute.In addition,, in the present invention, after molten steel being entered to LF stove, carry out the initial time (be refining time opening) of Argon as the refining of LF stove.
According to the present invention, add for the first time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot as long as in 1-5 minute, add in 1-5 minute after high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot can being mixed after the refining of LF stove starts after the refining of LF stove starts; Also after can having added one in 1-5 minute after the refining of LF stove starts, add immediately another kind, addition sequence for high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot does not have special requirement, but consider from the oxidisability that reduces ladle top slag, preferably adding after high alkalinity refining slag, then adding low aluminium slag supplying agent.Add for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot as long as in 10-15 minute, add in 10-15 minute after high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot can being mixed after the refining of LF stove starts after the refining of LF stove starts; Also after can having added one in 10-15 minute after the refining of LF stove starts, add immediately another kind, addition sequence for high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot does not have special requirement, but consider from the oxidisability that reduces ladle top slag, preferably adding after high alkalinity refining slag, then adding low aluminium slag supplying agent.In addition, add for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot if after starting for the refining of LF stove 20-25 minute, can will high alkalinity refining slag and the mixing of low aluminium slag supplying agent after after the refining of LF stove starts, in 20-25 minute, add; Also after can having added one in 20-25 minute after the refining of LF stove starts, add immediately another kind, addition sequence for high alkalinity refining slag and low aluminium slag supplying agent does not have special requirement, but consider from the oxidisability that reduces ladle top slag, preferably adding after high alkalinity refining slag, then adding low aluminium slag supplying agent.
According to the present invention, the high alkalinity refining slag of each time, low aluminium slag supplying agent and aluminum shot add-on can change in wide scope.Under preferable case, while adding for the first time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the add-on of high alkalinity refining slag is 1-2kg/t steel, and the add-on of low aluminium slag supplying agent is 0.8-1.5kg/t steel, and the add-on of aluminum shot is 0-1kg/t steel; While adding for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the add-on of high alkalinity refining slag is 1-2kg/t steel, and the add-on of low aluminium slag supplying agent is 0.8-1.5kg/t steel, and the add-on of aluminum shot is 0-1kg/t steel; While adding for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the add-on of high alkalinity refining slag is 0.5-1.5kg/t steel, and the add-on of low aluminium slag supplying agent is 0-1.5kg/t steel, and the add-on of aluminum shot is 0-1kg/t steel.More preferably in situation, while adding for the first time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the add-on of high alkalinity refining slag is 1.3-1.6kg/t steel, and the add-on of low aluminium slag supplying agent is 1-1.3kg/t steel, and the add-on of aluminum shot is 0.2-0.4kg/t steel; While adding for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the add-on of high alkalinity refining slag is 1.5-1.6kg/t steel, and the add-on of low aluminium slag supplying agent is 1-1.2kg/t steel, and the add-on of aluminum shot is 0.2-0.4kg/t steel; While adding for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the add-on of high alkalinity refining slag is 0.5-1kg/t steel, and the add-on of low aluminium slag supplying agent is 0-1.2kg/t steel, and the add-on of aluminum shot is 0-0.2kg/t steel; Ensureing, under the prerequisite of refining effect, taking cost into account, more preferably not add aluminum shot for the third time.At this, " steel " in units/kg/t steel refers to molten steel amount in ladle, and for example, " add-on of described high alkalinity refining slag is 1-2kg/t steel " refers to: with respect to molten steel in 1 ton of ladle, the add-on of described high alkalinity refining slag is 1-2kg.
According to the present invention, in LF refining process, under the condition of argon bottom-blowing, carry out, described add for the first time, for the second time and for the third time after, the flow of described argon bottom-blowing can be the same or different.Under preferable case, before adding for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the flow of argon gas is 1-1.5NL/t steel min; Between adding for the second time and adding for the third time, the flow of argon gas is 1-1.5NL/t steel min; After adding for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, finish to the refining of LF stove, the flow of argon gas is 0.5-1.0NL/t steel min.More preferably in situation, before adding for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the flow of argon gas is 1.2-1.5NL/t steel min; Between adding for the second time and adding for the third time, the flow of argon gas is 1.2-1.5NL/t steel min; After adding for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, finish to the refining of LF stove, the flow of argon gas is 0.8-1.0NL/t steel min.
In the present invention, unit " NL/t steel min " refers to respect to molten steel per ton, the argon flow amount of per minute (in standard volume).
According to the present invention, the temperature of LF refining is not had to special requirement, can adopt the temperature of the conventional use in this area to carry out.Under preferable case, the temperature of described LF refining is 1550-1650 DEG C; Be preferably 1600-1630 DEG C.
According to the present invention, described high alkalinity refining slag can be the conventional various high alkalinity refining slags in this area, and under preferable case, described high alkalinity refining slag preferably forms and comprises the CaO of 65-85 % by weight, the SiO of 1-5 % by weight
2, 1-3 % by weight Al
2o
3, 7-15 % by weight CaF
2mgO with 1-5 % by weight; In addition, also contain a small amount of impurity.This refining slag can make by conventional method, for example, and can be by quickened lime, fluorite be evenly mixed and are made according to the ratio of weight ratio 10:1-10:2.
According to the present invention, described low aluminium slag supplying agent can be the conventional various low aluminium slag supplying agent in this area.Under preferable case, the composition of described low aluminium slag supplying agent comprises the Al of 25-30 % by weight
2o
3, 25-30 % by weight CaO, 20-25 % by weight SiO
2, 5-10 % by weight Al; In addition, also contain a small amount of impurity.
According to the present invention, under preferable case, the particle diameter of described aluminum shot is 5-20mm, and the aluminium content of aluminum shot is more than 98 % by weight, is preferably 98 % by weight ~ 99.9 % by weight.
According to the present invention, the method is carried out calcium processing to molten steel after being also included in and adding for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot.Under preferable case, molten steel is carried out to the method for calcium processing by adding silicon-calcium wire to realize.
According to the present invention, the add-on of silicon-calcium wire meets following formula:
G=1500×(Alt-Als+S)×W×D/N
G-silicon-calcium wire add-on, m;
Holo-Al content in Alt-molten steel, % by weight;
Acid-soluble aluminum content in Als-molten steel, % by weight;
Sulphur content in S-molten steel, % by weight;
Molten steel amount in W-ladle, t;
D-silicon-calcium wire weight, kg/m;
N-silicon-calcium wire calcium content, % by weight.
Wherein, the content of above-mentioned Alt, Als, S can be measured by the method for spectroscopic analysis, by measuring on Thermo Scientific ARL4460 direct-reading spectrometer described later.
Add silicon-calcium wire by above-mentioned formula, can effectively reduce category-A and category-B inclusion in molten steel.
According to the present invention, under preferable case, the composition of described silicon-calcium wire comprises: the Ca of 28-32 % by weight, the Si of 50-55 % by weight, the Fe of 5-10 % by weight; In addition, also contain a small amount of impurity.
According to the present invention, after the method is also included in described silicon-calcium wire and has added, be under the condition of 0.5-1.0NL/t steel min at argon bottom-blowing flow, refining 6-10min, obtains the molten steel after LF refining.
According to the present invention, although the molten steel after the LF refining obtaining directly can be cast, thus steel finished product obtained.But before being preferably also included in the molten steel after LF refining being cast, the molten steel after LF refining is sent to RH vacuum station and carries out vacuum-treat, and carry out alloy fine setting in treating processes, after RH processing finishes, carry out calcium processing.
According to the present invention, molten steel after LF refining is sent to RH vacuum station molten steel is carried out to vacuum-treat, and in treating processes, carry out alloy fine setting, after RH processing finishes, carrying out the method for calcium processing can carry out according to following steps again: the molten steel after LF refining is sent to RH vacuum station and carries out vacuum-treat, RH treating processes comprises that promoting argon flow amount with tubular stinger is 1200-1500NL/min, and the treatment time that is less than 300Pa in vacuum tightness is more than 20min.RH processes after 15-18min, keeps vacuum tightness, adds alloy, carries out alloy fine setting, and the object of alloy fine setting is according to steel grade requirement, each metal content is adjusted near the middle limit of steel grade requirement, for example, can fluctuate 3%.After alloying, more than circular treatment 5min, make composition even, vacuum breaker, then molten steel is carried out to calcium processing, calcium processing is the same with above-mentioned calcium processing in LF refining furnace to be undertaken by the silicon-calcium wire that adds same composition, and the add-on of silicon-calcium wire is 1.0-5.0m/t steel.Adopting ladle bottom blowing argon flow amount is 0.5-1.0NL/t steel min, more than blowing argon gas 5min, is preferably 5-10min.
According to the present invention, the method comprises casts molten steel, obtains the method for continuously cast bloom.
According to the present invention, the method also comprises passes through rolling technology by continuously cast bloom, is produced into steel finished product (for example steel pipe or rod iron).
According to the present invention, above-mentioned continuous casting and rolling technology can adopt the conventional method in this area and condition to carry out.
Below will describe the present invention by embodiment, but the present invention is not limited in following embodiment.
In following examples and comparative example, C content, Alt content, Als content, S content adopt the method for spectroscopic analysis, on Thermo Scientific ARL4460 direct-reading spectrometer, measure.
In following examples and comparative example, in carburelant, carbon content is 99 % by weight, and surplus is impurity; In ferrosilicon, contain the Si of 75 % by weight, 23% iron, all the other are impurity; In ferromanganese, contain the Mn of 65 % by weight, the Fe of 33% weight, all the other are impurity; Consisting of of silicon-calcium wire: 30 % by weight Ca, 55 % by weight Si, 10 % by weight Fe, surplus is impurity, this silicon-calcium wire weight is 150kg/m.
In following examples and comparative example, in round steel sulphur content by adopt carbon and sulfur analytical instrument (be purchased from LECO company, model is CS-444LS) measure T[O] mensuration by oxygen-nitrogen analyzer (be purchased from LECO company, model is TC-600).
Embodiment 1
In the present embodiment, the SiO of the CaO that consists of 70 % by weight of high alkalinity refining slag, 3 % by weight
2, 3 % by weight Al
2o
3, 12 % by weight CaF
2with the MgO of 5 % by weight, surplus is impurity.The Al that consists of 25 % by weight of low aluminium slag supplying agent
2o
3, the CaO of 30 % by weight, the SiO of 25 % by weight
2, 10 % by weight Al, surplus is impurity.The particle diameter of described aluminum shot is 10-15mm, and the aluminium content of aluminum shot is 99 % by weight, and surplus is impurity.
In converter, molten iron is smelted, obtain the molten steel that converter smelting terminal carbon content is 0.05 % by weight (consist of C:0.05 % by weight, Si:0.01 % by weight, Mn:0.05 % by weight, S:0.006 % by weight, Fe:99.81 % by weight, surplus is impurity; Liquid steel temperature is 1670 DEG C) 135 tons, then the tapping of falling stove, when tap is 40 ton hours, in ladle, add ferro-aluminum (aluminium content is that 40 % by weight, iron level are that 58 % by weight, surplus are impurity) to carry out deoxidation, add-on is 2.5kg/t steel, adds immediately carburelant 1kg/t steel, ferrosilicon 1.5kg/t steel, manganese metal 4.5kg/t steel after ferro-aluminum has added.When tapping is 90 ton hours, in ladle, add high alkalinity refining slag 5kg/t steel.After tapping finishes, evenly add low aluminium slag supplying agent 2.0kg/t steel to the ladle top of the slag.In above-mentioned tapping process, ladle bottom blowing argon flow amount adopts 0.8NL/t steel min.After tapping finishes, adopt the BOTTOM ARGON BLOWING flow Argon 6min of 0.5NL/t steel min, then by molten steel (molten steel consists of C:0.15 % by weight, S:0.008 % by weight, Si:0.016 % by weight, Mn:0.51 % by weight, Fe:98.15 % by weight, surplus is impurity; Liquid steel temperature is 1610 DEG C) be sent to LF refining.
Molten steel carries out steel ladle bottom argon blowing and starts refining to connecting BOTTOM ARGON BLOWING after LF stove, argon blowing rate adopts 1.5NL/t steel min, after Argon 2min, in sampling analysis molten steel, Als content is 0.03 % by weight, in ladle, add high alkalinity refining slag 1.5kg/t steel, low aluminium slag supplying agent 1.0kg/t steel and Al ball 0.3kg/t steel (adding cost 2min) simultaneously, add rear continuation refining (refining temperature is 1555 DEG C); Refining starts after 10min, ladle bottom blowing argon flow amount is adjusted into 1.2NL/t steel min, in sampling analysis molten steel, Als content is 0.02 % by weight, in ladle, add high alkalinity refining slag 1.5kg/t steel, low aluminium slag supplying agent 1.0kg/t steel and Al ball 0.3kg/t steel (adding cost 2min) simultaneously, after adding, proceed refining (refining temperature is 1575 DEG C); Refining starts after 20min, and ladle bottom blowing argon flow amount is adjusted into 1.0NL/t steel min, and in sampling analysis molten steel, Als is 0.04 % by weight, adds high alkalinity refining slag 0.5kg/t steel and low aluminium slag supplying agent 0.5kg/t steel (adding cost 2min) simultaneously.Then continue refining (refining temperature is 1599 DEG C), after refining 12min, liquid steel temperature reaches 1635 DEG C.Now, ladle bottom blowing argon flow amount is adjusted into 1.0NL/t steel min, sampling analysis now in molten steel Alt be 0.045 % by weight, Als is 0.043 % by weight, S content is 0.003 % by weight, in ladle, feed silicon-calcium wire 650m, after silicon-calcium wire has been fed, ladle is proceeded argon bottom-blowing, and argon flow amount adopts 0.8NL/t steel min, after Argon 8min, molten steel LF sets off and is sent to RH and carries out vacuum-treat.
Molten steel (temperature is 1607 DEG C) is after RH vacuum station, setting RH tubular stinger lifting argon flow amount is 1500NL/min, start to vacuumize, 3min final vacuum degree reaches 100Pa and is stabilized in this value and carries out vacuum-treat, in the time that the treatment time is 18min, keep vacuum tightness, add carburelant 0.1kg/t steel, ferrosilicon 0.15kg/t steel, after alloy adds, circular treatment 7min, make composition even, vacuum breaker.Then molten steel is carried out to calcium processing, the add-on of silicon-calcium wire is 1.5m/t steel, and line feeding process ladle bottom blowing argon flow amount is 1.0NL/t steel min, then blowing argon gas 6min.Then molten steel is sent to continuous casting working procedure, is produced into 360 × 450mm bloom continuous casting base product, continuously cast bloom product, by rolling technology, is produced into Φ 40mm round steel.According to inclusion grading standard GB/T10561-2005 evaluate out category-A inclusion in Finished Steel, category-B inclusion, C type impurity, the grading of D type impurity all≤1 grade, in round steel, sulphur content is 0.0025 % by weight, T[O] average≤13.8 × 10
-6.
Embodiment 2
In the present embodiment, the SiO of the CaO that consists of 85 % by weight of high alkalinity refining slag, 2 % by weight
2, 2 % by weight Al
2o
3, 8 % by weight CaF
2with the MgO of 4 % by weight, surplus is impurity.The Al that consists of 28 % by weight of low aluminium slag supplying agent
2o
3, the CaO of 28 % by weight, the SiO of 20 % by weight
2, 8 % by weight Al, surplus is impurity.The particle diameter of described aluminum shot is 10-15mm, and the aluminium content of aluminum shot is 99 % by weight, and surplus is impurity.
In converter, molten iron is smelted, obtain the molten steel that converter smelting terminal carbon content is 0.06 % by weight (consist of C:0.06 % by weight, Si:0.02 % by weight, Mn:0.04 % by weight, S:0.005 % by weight, Fe:99.82 % by weight, surplus is impurity; Liquid steel temperature is 1675 DEG C) 130 tons, then the tapping of falling stove, when tap is 40 ton hours, in ladle, add ferro-aluminum (aluminium content is that 40 % by weight, iron level are that 58 % by weight, surplus are impurity) to carry out deoxidation, add-on is 3.15kg/t steel, adds immediately carburelant 3.0kg/t steel, ferrosilicon 1.2kg/t steel, manganese metal 7.5kg/t steel after ferro-aluminum has added.When tapping is 90 ton hours, in ladle, add high alkalinity refining slag 5.5kg/t steel.After tapping finishes, evenly add low aluminium slag supplying agent 1.5kg/t steel to the ladle top of the slag.After in above-mentioned tapping process, ladle bottom blowing argon flow amount adopts 0.8NL/t steel min tapping to finish, adopt the BOTTOM ARGON BLOWING flow Argon 6min of 0.6NL/t steel min, then by molten steel, (molten steel consists of C:0.35 % by weight, S:0.008 % by weight, Si:0.015 % by weight, Mn:0.81 % by weight, Fe:98.72 % by weight, surplus is impurity; Liquid steel temperature is 1565 DEG C) be sent to LF refining.
Molten steel carries out steel ladle bottom argon blowing and starts refining to connecting BOTTOM ARGON BLOWING after LF stove, argon blowing rate adopts 1.5NL/t steel min, after Argon 3min, in sampling analysis molten steel, Als content is 0.025 % by weight, in ladle, add high alkalinity refining slag 1.3kg/t steel, low aluminium slag supplying agent 1.2kg/t steel and Al ball 0.4kg/t steel (adding cost 2min) simultaneously, add rear continuation refining (refining temperature is 1588 DEG C); Refining starts after 12min, ladle bottom blowing argon flow amount is adjusted into 1.5NL/t steel min, in sampling analysis molten steel, Als content is 0.03 % by weight, in ladle, add high alkalinity refining slag 1.5kg/t steel, low aluminium slag supplying agent 1.0kg/t steel and Al ball 0.32kg/t steel (adding cost 2min) simultaneously, after adding, proceed refining (refining temperature is 1605 DEG C); Refining starts after 20min, ladle bottom blowing argon flow amount is adjusted into 1.0NL/t steel min, in sampling analysis molten steel, Als is 0.04 % by weight, add high alkalinity refining slag 0.5kg/t steel (adding cost 2min) simultaneously, then continue refining (refining temperature is 1620 DEG C), after refining 12min, liquid steel temperature reaches 1630 DEG C.Now, ladle bottom blowing argon flow amount is adjusted into 0.5NL/t steel min, sampling analysis now in molten steel Alt be 0.037 % by weight, Als is 0.035 % by weight, S content is 0.002 % by weight, in ladle, feed silicon-calcium wire 520m, after silicon-calcium wire has been fed, ladle is proceeded argon bottom-blowing, and argon flow amount adopts 0.5NL/t steel min, after Argon 7min, molten steel LF sets off and is sent to RH and carries out vacuum-treat.
Molten steel (temperature is 1604 DEG C) is after RH vacuum station, setting RH tubular stinger lift gas flow is 1500NL/min, start to vacuumize, 3.5min final vacuum degree reaches 100Pa and is stabilized in this value and carries out vacuum-treat, in the time that the treatment time is 20min, keep vacuum tightness, add ferrosilicon 0.12kg/t steel, after alloy adds, circular treatment 6min, make composition even, vacuum breaker.Then molten steel is carried out to calcium processing, the add-on of silicon-calcium wire is 1.0m/t steel, and line feeding process ladle bottom blowing argon flow amount is 0.6NL/t steel min, then blowing argon gas 7min.Then molten steel is sent to continuous casting working procedure, is produced into 200 × 200mm billet continuous casting base product, continuously cast bloom product, by rolling technology, is produced into Φ 50mm round steel.According to inclusion grading standard GB/T10561-2005 evaluate out category-A inclusion in Finished Steel, category-B inclusion, C type impurity, the grading of D type impurity all≤1 grade, in round steel, sulphur content is 0.002 % by weight, T[O] average≤11.7 × 10
-6.
Embodiment 3
In the present embodiment, the SiO of the CaO that consists of 85 % by weight of high alkalinity refining slag, 4 % by weight
2, 2 % by weight Al
2o
3, 13 % by weight CaF
2with the MgO of 2 % by weight, surplus is impurity.The Al that consists of 28 % by weight of low aluminium slag supplying agent
2o
3, the CaO of 25 % by weight, the SiO of 23 % by weight
2, 7 % by weight Al, surplus is impurity.The particle diameter of described aluminum shot is 10-15mm, and the aluminium content of aluminum shot is 99 % by weight, and surplus is impurity.
In converter, molten iron is smelted, obtain the molten steel that converter smelting terminal carbon content is 0.07 % by weight (consist of C:0.07 % by weight, Si:0.01 % by weight, Mn:0.05 % by weight, S:0.007 % by weight, Fe:99.80 % by weight, surplus is impurity; Liquid steel temperature is 1665 DEG C) 138 tons, then the tapping of falling stove, when tap is 40 ton hours, in ladle, add ferro-aluminum (aluminium content is that 40 % by weight, iron level are that 58 % by weight, surplus are impurity) to carry out deoxidation, add-on is 2.8kg/t steel, adds immediately carburelant 2.0kg/t steel, ferrosilicon 1.5kg/t steel, manganese metal 3.5kg/t steel after ferro-aluminum has added.When tapping is 90 ton hours, in ladle, add high alkalinity refining slag 6.0kg/t steel.After tapping finishes, evenly add low aluminium slag supplying agent 1.8kg/t steel to the ladle top of the slag.In above-mentioned tapping process, ladle bottom blowing argon flow amount adopts 0.85NL/t steel min.After tapping finishes, adopt the BOTTOM ARGON BLOWING flow Argon 6min of 0.55NL/t steel min, then by molten steel (molten steel consists of: the C of 0.28 % by weight, S:0.009 % by weight, Si:0.017 % by weight, Mn:0.42 % by weight, Fe:99.23 % by weight, surplus is impurity; Liquid steel temperature is 1555 DEG C) be sent to LF refining.
Molten steel carries out steel ladle bottom argon blowing and starts refining to connecting BOTTOM ARGON BLOWING after LF stove, argon blowing rate adopts 1.5NL/t steel min, after Argon 1min, in sampling analysis molten steel, Als content is 0.030 % by weight, and add high alkalinity refining slag 1.5kg/t steel, low aluminium slag supplying agent 1.3kg/t steel and Al ball 0.35kg/t steel (adding cost 2min) in ladle, add rear continuation refining (refining temperature is 1568 DEG C); Refining starts after 11min, ladle bottom blowing argon flow amount is adjusted into 1NL/t steel min, in sampling analysis molten steel, Als content is 0.035 % by weight, and add high alkalinity refining slag 1.6kg/t steel, low aluminium slag supplying agent 1.1kg/t steel and Al ball 0.35kg/t steel (adding cost 2min) in ladle, after adding, proceed refining (refining temperature is 1588 DEG C); Refining starts after 23min, ladle bottom blowing argon flow amount is adjusted into 1.1NL/t steel min, in sampling analysis molten steel, Als is 0.038 % by weight, add high alkalinity refining slag 0.8kg/t steel and low aluminium slag supplying agent 1.2kg/t steel (adding cost 2min) simultaneously, then continue refining (refining temperature is 1612 DEG C), after refining 12min, liquid steel temperature reaches 1645 DEG C.Now, ladle bottom blowing argon flow amount is adjusted into 0.8NL/t steel min, sampling analysis now in molten steel Alt be 0.036 % by weight, Als is 0.033 % by weight, S content is 0.0018 % by weight, in ladle, feed silicon-calcium wire 480m, after silicon-calcium wire has been fed, ladle is proceeded argon bottom-blowing, and argon flow amount adopts 0.5NL/t steel min, after Argon 7min, molten steel LF sets off and is sent to RH and carries out vacuum-treat.
Molten steel (liquid steel temperature is 1628 DEG C) is after RH vacuum station, setting RH tubular stinger lift gas flow is 1500NL/min, start to vacuumize, 3.5min final vacuum degree reaches 100Pa and is stabilized in this value and carries out vacuum-treat, in the time that the treatment time is 20min, keep vacuum tightness, add ferrosilicon 0.2kg/t steel, after alloy adds, circular treatment 6min, make composition even, vacuum breaker.Then molten steel is carried out to calcium processing, the add-on of silicon-calcium wire is 0.8m/t steel, and line feeding process ladle bottom blowing argon flow amount is 0.7NL/t steel min, then blowing argon gas 7min.Then molten steel is sent to continuous casting working procedure, is produced into 200 × 200mm bloom continuous casting base product, continuously cast bloom product, by rolling technology, is produced into Φ 50mm round steel.According to inclusion grading standard GB/T10561-2005 evaluate out category-A inclusion in Finished Steel, category-B inclusion, C type impurity, the grading of D type impurity all≤1 grade, in round steel, sulphur content is 0.0017 % by weight, T[O] average≤10.5 × 10
-6.
Embodiment 4
In the present embodiment, the SiO of the CaO that consists of 65 % by weight of high alkalinity refining slag, 2 % by weight
2, 1 % by weight Al
2o
3, 15 % by weight CaF
2with the MgO of 4 % by weight, surplus is impurity.The Al that consists of 30 % by weight of low aluminium slag supplying agent
2o
3, the CaO of 28 % by weight, the SiO of 23 % by weight
2, 6 % by weight Al, surplus is impurity.The particle diameter of described aluminum shot is 10-15mm, and the aluminium content of aluminum shot is 99 % by weight, and surplus is impurity.
In converter, molten iron is smelted, obtain the molten steel that converter smelting terminal carbon content is 0.06 % by weight (consist of C:0.06 % by weight, Si:0.015 % by weight, Mn:0.045 % by weight, S:0.006 % by weight, Fe:99.81 % by weight, surplus is impurity; Liquid steel temperature is 1665 DEG C) 133 tons, then the tapping of falling stove, when tap is 40 ton hours, in ladle, add ferro-aluminum (aluminium content is that 40 % by weight, iron level are that 58 % by weight, surplus are impurity) to carry out deoxidation, add-on is 2.18kg/t steel, adds immediately ferrosilicon 1.5kg/t steel, ferromanganese 6.5kg/t steel after ferro-aluminum has added.When tapping is 90 ton hours, in ladle, add high alkalinity refining slag 6kg/t steel.After tapping finishes, evenly add low aluminium slag supplying agent 3.0kg/t steel to the ladle top of the slag.In above-mentioned tapping process, ladle bottom blowing argon flow amount adopts 0.7NL/t steel min.After tapping finishes, adopt the BOTTOM ARGON BLOWING flow Argon 7min of 0.5NL/t steel min, then by molten steel, (molten steel consists of C:0.08 % by weight, S:0.008 % by weight, Si:0.18 % by weight; Mn:0.71 % by weight, Fe:98.11 % by weight, surplus is impurity; Liquid steel temperature is 1588 DEG C) be sent to LF refining.
Molten steel carries out steel ladle bottom argon blowing and starts refining to connecting BOTTOM ARGON BLOWING after LF stove, argon blowing rate adopts 1.2NL/t steel min, after Argon 4min, in sampling analysis molten steel, Als content is 0.035 % by weight, in ladle, add high alkalinity refining slag 1.6kg/t steel, low aluminium slag supplying agent 1.2kg/t steel and Al ball 0.2kg/t steel (adding cost 2min) simultaneously, add rear continuation refining (refining temperature is 1545 DEG C); Refining starts after 14min, in sampling analysis molten steel, Als content is 0.033 % by weight, continue as under 1.2NL/t steel min condition at ladle bottom blowing argon flow amount, in ladle, add high alkalinity refining slag 1.5kg/t steel, low aluminium slag supplying agent 1.2kg/t steel and Al ball 0.2kg/t steel (adding cost 1min), after adding, proceed refining (refining temperature is 1578 DEG C); Refining starts after 24min, and ladle bottom blowing argon flow amount is adjusted into 1.5NL/t steel min, and in sampling analysis molten steel, Als is 0.034 % by weight, adds high alkalinity refining slag 1.0kg/t steel (adding cost 2min) simultaneously.Then continue refining (refining temperature is 1598 DEG C), after refining 13min, liquid steel temperature reaches 1623 DEG C.Now, ladle bottom blowing argon flow amount is adjusted into 0.7NL/t steel min, sampling analysis now in molten steel Alt be 0.033 % by weight, Als is 0.032 % by weight, and S content is 0.002 % by weight, in ladle, feeds silicon-calcium wire 390m, after silicon-calcium wire has been fed, ladle is proceeded argon bottom-blowing, and argon flow amount adopts 0.5NL/t steel min, after Argon 7min, molten steel LF sets off and carries out continuous casting, generate Φ 200mm circle base product, by rolling technology, be produced into Φ 60mm round steel.According to inclusion grading standard GB/T10561-2005 evaluate out category-A inclusion in Finished Steel, category-B inclusion, C type impurity, the grading of D type impurity all≤1.5 grades, in round steel, sulphur content is 0.0018 % by weight, the every grading of inclusion all≤1.5 grades, T[O] average≤18.8 × 10
-6.
Embodiment 5
Carry out according to the method for embodiment 3, different, add for the first time the time of high alkalinity refining slag, low aluminium slag supplying agent and Al ball after Argon 6min.Obtain in the same manner Φ 50mm round steel.Evaluating out in Finished Steel category-A inclusion according to inclusion grading standard GB/T10561-2005 is that 1.5 grades, category-B inclusion are that 1.5 ranks, C type impurity are that 1.5 grades, D type impurity are 1.5 grades.In round steel, sulphur content is 0.0025 % by weight, T[O] average≤19.2 × 10
-6.
Comparative example 1
Carry out according to the method for embodiment 3, different, after LF refining 1min, by once all adding of high alkalinity refining slag, low aluminium slag supplying agent and Al ball.Obtain in the same manner Φ 50mm round steel.Evaluating out in Finished Steel category-A inclusion according to inclusion grading standard GB/T10561-2005 is that 2.5 grades, category-B inclusion are that 1.5 ranks, C type impurity are that 2.0 grades, D type impurity are 2.0 grades.In round steel, sulphur content is 0.005 % by weight, T[O] average out to 25 × 10
-6.
Can find out by above-described embodiment 1-5, by adopting method of the present invention, can obtain sulphur≤0.003%, the every grading of inclusion all≤1.5 grades, T[O]≤20 × 10
-6the continuous cast products of high-quality.And by high alkalinity refining slag, low aluminium slag supplying agent consist of with the comparative example once adding 1 of Al ball cannot obtain sulphur≤0.003%, the every grading of inclusion all≤1.5 grades, T[O]≤20 × 10
-6the continuous cast products of high-quality.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. one kind for improving the method for refining of cleanliness factor of steel, the method comprises that the molten steel that converter smelting is obtained taps in ladle, and carry out the refining of LF stove and casting, in tapping process, carry out pre-deoxidation alloying and adopt high alkalinity refining slag to carry out desulfurization, tapping finishes the low aluminium slag supplying agent of rear employing and carries out the modification of ladle top slag; It is characterized in that, the method of described LF stove refining comprises to be delivered to ladle in LF stove, in the molten steel in ladle, be blown under the condition of argon gas, in molten steel, add several times described high alkalinity refining slag, described low aluminium slag supplying agent and aluminum shot, and control molten steel in LF stove refining process in, Als content is 0.03 % by weight～0.05 % by weight.
2. method of refining according to claim 1, wherein, described high alkalinity refining slag, low aluminium slag supplying agent and adding separately of aluminum shot divide respectively and carry out for 2-5 time.
3. method of refining according to claim 2, wherein, divides and adds high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot for three times.
4. method of refining according to claim 3, wherein, be that the refining of LF stove started in rear 1-5 minute the opportunity that adds for the first time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot; Be that the refining of LF stove started in rear 10-15 minute the opportunity that adds for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot; Be that the refining of LF stove starts rear 20-25 minute the opportunity that adds for the third time high alkalinity refining slag and low aluminium slag supplying agent, and described LF stove refining time is 30-45 minute.
5. method of refining according to claim 4, wherein, while adding for the first time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the add-on of high alkalinity refining slag is 1-2kg/t steel, the add-on of low aluminium slag supplying agent is 0.8-1.5kg/t steel, and the add-on of aluminum shot is 0-1kg steel; While adding for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the add-on of high alkalinity refining slag is 1-2kg/t steel, and the add-on of low aluminium slag supplying agent is 0.8-1.5kg/t steel, and the add-on of aluminum shot is 0-1kg/t steel; While adding for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the add-on of high alkalinity refining slag is 0.5-1.5kg/t steel, and the add-on of low aluminium slag supplying agent is 0-1.5kg/t steel, and the add-on of aluminum shot is 0-1kg/t steel.
6. method of refining according to claim 4, wherein, in LF stove refining process, in the time period before adding for the second time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, the flow of argon gas is 1-1.5NL/t steel min; In time period between adding for the second time and adding for the third time, the flow of argon gas is 1-1.5NL/t steel min; After adding for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot, to the time period that the refining of LF stove finishes, the flow of argon gas is 0.5-1.0NL/t steel min.
7. method of refining according to claim 4, wherein, the method is carried out calcium processing to molten steel after being also included in and adding for the third time high alkalinity refining slag, low aluminium slag supplying agent and aluminum shot.
8. method of refining according to claim 7, wherein, the method that molten steel is carried out to calcium processing for to add silicon-calcium wire in molten steel, and the add-on of silicon-calcium wire meets following formula:
G=1500×(Alt-Als+S)×W×D/N
G-silicon-calcium wire add-on, m;
Holo-Al content in Alt-molten steel, % by weight;
Acid-soluble aluminum content in Als-molten steel, % by weight;
Sulphur content in S-molten steel, % by weight;
Molten steel amount in W-ladle, t;
D-silicon-calcium wire weight, kg/m;
N-silicon-calcium wire calcium content, % by weight.
9. according to the method for refining described in any one in claim 1-7, wherein, the composition of described high alkalinity refining slag comprises the CaO of 65-85 % by weight, SiO below 1-5 % by weight
2, 1-3 % by weight Al
2o
3, 7-15 % by weight CaF
2mgO with 1-5 % by weight; The composition of described low aluminium slag supplying agent comprises the Al of 25-30 % by weight
2o
3, the CaO of 25-30 % by weight, the SiO of 20-25 % by weight
2, 5-10 % by weight Al; The particle diameter of described aluminum shot is 5-20mm, and the aluminium content of aluminum shot is more than 98 % by weight.
10. method of refining according to claim 1, wherein, the carbon content of the molten steel that converter smelting obtains is that 0.03%-0.08 % by weight, sulphur content are 0.005%-0.015 % by weight, tapping temperature is 1640-1700 DEG C.
11. according to the method for refining described in claim 1 or 7, and wherein, the method also comprises that the molten steel after the refining of LF stove is sent to RH vacuum station carries out vacuum-treat, and carries out alloy fine setting in treating processes, carries out calcium processing after RH processing finishes.
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| CN112522474A (en) * | 2020-12-01 | 2021-03-19 | 攀钢集团西昌钢钒有限公司 | Method for controlling LF refining end point temperature |
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| CN113122672A (en) * | 2021-04-20 | 2021-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for dephosphorizing semisteel steelmaking converter after furnace |
| CN115449599A (en) * | 2022-10-11 | 2022-12-09 | 安徽富凯特材有限公司 | Molten steel calcium deoxidation method |
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