CN102277471B - Manufacturing method of steel - Google Patents

Manufacturing method of steel Download PDF

Info

Publication number
CN102277471B
CN102277471B CN 201110221641 CN201110221641A CN102277471B CN 102277471 B CN102277471 B CN 102277471B CN 201110221641 CN201110221641 CN 201110221641 CN 201110221641 A CN201110221641 A CN 201110221641A CN 102277471 B CN102277471 B CN 102277471B
Authority
CN
China
Prior art keywords
steel
molten steel
calcium
aluminium
minutes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 201110221641
Other languages
Chinese (zh)
Other versions
CN102277471A (en
Inventor
王海兵
苏雄杰
张珉
王鑫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pangang Group Chengdu Steel and Vanadium Co Ltd
Original Assignee
Pangang Group Chengdu Steel and Vanadium Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pangang Group Chengdu Steel and Vanadium Co Ltd filed Critical Pangang Group Chengdu Steel and Vanadium Co Ltd
Priority to CN 201110221641 priority Critical patent/CN102277471B/en
Publication of CN102277471A publication Critical patent/CN102277471A/en
Application granted granted Critical
Publication of CN102277471B publication Critical patent/CN102277471B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention provides a manufacturing method of steel. The method comprises the following steps: roughly melting molten steel; adding a pre-deoxidizer into a steel ladle in a process from tapping to ladling; and refining the molten steel in an LF (ladle furnace), wherein aluminum is added into the molten steel to perform precipitation and deoxidization in a process of refining the molten steel in the LF furnace; adding the synthesized residues into the ladle to heat; and adding a diffusible deoxidizer into the ladle to perform strengthened deoxidization after the synthesized residues are molten. According to the manufacturing method of steel in the invention, the molten steel can be purified, clogging of a water gap is effectively prevented, and the casting performance of the molten steel is improved. The manufacturing method of steel in the invention is simple, convenient and easy to operate, and has a good application prospect.

Description

The manufacture method of steel
Technical field
The present invention relates to a kind of manufacture method of steel, more particularly, relate to a kind of manufacture method that improves the steel of molten steel casting performance.
Background technology
Inclusion in the control steel is the important content of process for making research.Non-metallic inclusion has reduced plasticity, toughness and the fatigue property of steel, and the cold and hot working performance of steel and even some physicals are degenerated.Simultaneously, non-metallic inclusion has considerable influence to the casting properties of molten steel.
Aluminium is strong deoxidant element, can effectively the oxygen level in the molten steel be dropped to lower level, so be widely used as reductor in process for making.Common process is not only just adopting aluminium deoxidation in the steel-making water process, and also repeatedly (comprises final deoxygenation) at the LF stove and add the aluminum precipitation deoxidation.Yet after repeatedly using the aluminum precipitation deoxidation, particularly the oxygen level in LF stove middle and later periods molten steel is extremely low, forms the tiny Al that is difficult to float in the steel easily 2O 3Inclusion is easy to stick to mouth of a river wall and causes nozzle clogging and stop when continuous casting.The dross thing of Nian Fuing enters and causes the steel flaw detection defective in the molten steel simultaneously.
At present, adopt hello calcium line to the dystectic Al in the molten steel 2O 3Be mingled with and carry out denaturing treatment, form low-melting calcium aluminate, improve the casting properties of molten steel with this.Yet, if calcium add-on deficiency generates high-melting-point calcium aluminate system easily; If the calcium add-on is too much, then can produce the problem that insoluble more dystectic CaS is mingled with.So not only can not reach the metallurgical effect of expection, can worsen the casting properties of steel on the contrary.
Announce among the CN101565771A that at Chinese patent method for making steel comprises steps such as electrosmelting, tapping and pre-deoxidation, molten steel calcium are handled, stirring come-up.And the amount of feeding calcium silk be in the molten steel inclusion 0.02%～0.03%, main purpose is the inclusion that reduces in the molten steel, for example, reduces the grading of category-B inclusion.Yet in the method, through feeding calcium silk behind the liquid steel pre-deoxidizing, this moment, inclusion did not fully float, and the sex change effect that calcium is handled inclusion is affected, and the content of inclusion is difficult for grasping in the molten steel simultaneously, and therefore, the amount that feeds the calcium silk is difficult to determine.In addition, do not relate to the content of molten steel casting aspect of performance in the method that this Chinese patent is announced yet.
Summary of the invention
The object of the present invention is to provide the manufacture method of the steel of at least one technical problem in a kind of can the solving the problems of the technologies described above.
Manufacture method according to steel of the present invention may further comprise the steps: just make steel water; Add pre-deoxidant to ladle to the process of ladle tapping; Refined molten steel in the LF stove, wherein, in the LF stove in the process of refined molten steel, aluminium added carry out bulk deoxidation in the molten steel, will synthesize slag charge then and join in the ladle, heat afterwards, after the slag charge to be synthesized fusing, add diffusion deoxidizer in the ladle and strengthen deoxidation.
Pre-deoxidant can be aluminium and silicon-aluminium-barium-calcium alloy, and the add-on of aluminium can be 1Kg/t Steel～1.5Kg/t Steel, the add-on of silicon-aluminium-barium-calcium alloy can be 3Kg/t Steel～3.5Kg/t SteelSilicon-aluminium-barium-calcium alloy can comprise following component: 50%≤Si≤55%, 8%≤Ca≤14%, 8%≤Al≤14%, 8%≤Ba≤14%, 0%＜S≤0.05%, 0%＜P≤0.05%, 0%＜C≤2.0% by weight percentage, and surplus is Fe and unavoidable impurities.
Pre-deoxidant also can be used aluminium entirely, and the add-on of aluminium can be 2.2Kg/t Steel～2.5Kg/t Steel
In the refining of LF stove, aluminium joined carry out bulk deoxidation in the molten steel before, the total oxygen content in the molten steel can be 0.0060wt%～0.0120wt%.
Aluminium is added the step of carrying out bulk deoxidation in the molten steel can be comprised: with 0.4Kg/t Steel～0.8Kg/t SteelAmount aluminum steel fed molten steel carry out bulk deoxidation.
The add-on of synthetic slag charge can be 12Kg/t Steel～14Kg/t Steel, in the synthetic slag charge of 100 weight parts, can comprise the CaO of 60～68 weight parts, the Al of 15～20 weight parts 2O 3, be no more than 5.0 weight parts and be not the SiO of 0 weight part 2, be no more than 3.0 weight parts and be not the MgO of 0 weight part, the CaF of 10～15 weight parts 2
Diffusion deoxidizer can be that granularity is the silicon calcium powder of 0.5～1.0mm, and the add-on of silicon calcium powder can be 0.4Kg/t Steel～0.8Kg/t SteelSilicon calcium powder comprises following component: 28%≤Ca≤35%, 50%≤Si≤65%, 0%＜C≤1.2%, 0%＜Al≤2.4%, 0%＜P≤0.04%, 0%＜S≤0.08% by weight percentage, all the other are unavoidable impurities, and each components contents sum is 100%.
Can form white slag add diffusion deoxidizer in ladle after, the FeO in the described white slag and the total amount of MnO can be 0～0.5wt%, and the basicity of white slag can be 3～5.
This method also can comprise white slag was kept 15 minutes～30 minutes.
This method also can comprise: after white slag is kept 15 minutes～30 minutes, in the mode of feeding the calcium alloy line to molten steel molten steel is carried out calcium and handle, the amount of the calcium metal in the calcium alloy line of feeding is 0.12Kg/t Steel～0.30Kg/t Steel, calcium was handled back soft blow argon 8 minutes～10 minutes.
Before carrying out the calcium processing, the sulphur content of molten steel can be controlled to be 0～0.012wt%, and full aluminium content can be controlled to be 0.015～0.025wt%.
This method also can comprise: after soft blow argon 8 minutes～10 minutes, stop the soft blow argon and molten steel was left standstill 10 minutes～15 minutes.
This method also can comprise: making after molten steel leaves standstill 10 minutes～15 minutes, by continuous casting molten steel is cast steel billet.
Can comprise the step that molten steel carries out the calcium processing in the mode of feeding the calcium alloy line to molten steel: with 0.4Kg/t Steel～0.8Kg/t SteelAmount silicon-calcium wire is fed molten steel, silicon-calcium wire comprises following component: 28%≤Ca≤35%, 50%≤Si≤65%, 0%＜C≤1.2%, 0%＜Al≤2.4%, 0%＜P≤0.04%, 0%＜S≤0.08% by weight percentage, all the other are unavoidable impurities, and each components contents sum is 100%.
According to the manufacture method of steel of the present invention, but cleaning molten steel has effectively prevented the dross at the mouth of a river, improves the casting properties of molten steel.In addition, the manufacture method of steel of the present invention is simple and easy to operate, has taken full advantage of existing technical process and equipment, does not need equipment is added or transforms, and has good application prospects.
Embodiment
Manufacture method according to steel of the present invention comprises: just make steel water, pre-deoxidation and LF stove (ladle refining furnace) refined molten steel.
At first, in converter, add molten iron, utilize the function of Converter Oxigen Blowing decarburization, molten iron just is smelt molten steel.Also selectively, in electric furnace (usually said electric furnace refers to electric arc furnace), add scrap iron and steel material, utilize the function of electric-arc heating, scrap iron and steel material just is smelt molten steel.
After just steel-making water is finished, in ladle, tap.In tapping process, add pre-deoxidant in the ladle and carry out pre-deoxidation.Described pre-deoxidant can be the combination of aluminium or aluminium and silicon-aluminium-barium-calcium alloy, that is, pre-deoxidant can be aluminium, and pre-deoxidant also can be the combination of aluminium and silicon-aluminium-barium-calcium alloy.In one embodiment, can in tapping process, adopt argon bottom-blowing to stir molten steel, molten steel is fully mixed with pre-deoxidant, improve the effect of pre-deoxidation.Silicon-aluminium-barium-calcium alloy comprises following component: 50%≤Si≤55%, 8%≤Ca≤14%, 8%≤Al≤14%, 8%≤Ba≤14%, 0%＜S≤0.05%, 0%＜P≤0.05%, 0%＜C≤2.0% by weight percentage, and surplus is Fe and unavoidable impurities.
Under the situation of combination as pre-deoxidant of using aluminium and silicon-aluminium-barium-calcium alloy, the add-on of aluminium can be 1Kg/t Steel～1.5Kg/t Steel, the add-on of silicon-aluminium-barium-calcium alloy can be 3Kg/t Steel～3.5Kg/t SteelIf the add-on of aluminium is less than 1Kg/t SteelAnd/or the add-on of silicon-aluminium-barium-calcium alloy is less than 3Kg/t Steel, then deoxidation of molten steel is bad, can increase the deoxidation burden of back operation, prolongs refining time.If the add-on of silicon-aluminium-barium-calcium alloy is greater than 3.5Kg/t Steel, then the silicone content in the molten steel is higher, and correspondingly basicity of slag is on the low side during the refining of LF stove.If the add-on of aluminium is more than 1.5Kg/t Steel, then aluminium is because of light come-up easily, and recovery rate is low, and deoxidation effect is poor, consumes excessive.
Using under the situation of aluminium as pre-deoxidant, the add-on of aluminium can be 2.2Kg/t Steel～2.5Kg/t SteelIf the add-on of aluminium is less than 2.2Kg/t Steel, then deoxidation of molten steel is bad, can increase the deoxidation burden of back operation, prolongs refining time.If the add-on of aluminium is more than 2.5Kg/t Steel, then aluminium is because of light come-up easily, and recovery rate is low, consumes excessive.
Then, adopt the LF stove under the condition of BOTTOM ARGON BLOWING, to carry out liquid steel refining., all chemical compositions can be controlled in the scope that requires between refining period at the LF stove.
Specifically, molten steel is behind LF stove refining station, and the feeding aluminum steel carries out bulk deoxidation in the ladle, adds the synthetic slag charge that is used for slag making then.Afterwards, heat slag making, after the slag charge to be synthesized fusing, add diffusion deoxidizer (for example silicon calcium powder) and strengthen deoxidation, form white slag fast, make the total amount of FeO and MnO in the slag at 0～0.5wt%, basicity of slag (wt%CaO/wt%SiO 2) be 3～5.If basicity is lower than 3, then deoxidation, sweetening effectiveness are poor.If basicity is higher than 5, the mobile variation of slag then.
Add before the aluminium in the LF stove, the total oxygen content of molten steel can be 0.0060wt%～0.0120wt%.The add-on of described aluminium can be 0.4Kg/t Steel～0.8Kg/t SteelIf the aluminium add-on is less than 0.4Kg/t Steel, then can not remove the oxygen in the steel effectively; If the aluminium add-on is more than 0.8Kg/t Steel, then the aluminium too high levels in the molten steel is easy to generate secondary oxidation.
The add-on that is used for the synthetic slag charge of slag making can be 12Kg/t Steel～14Kg/t SteelIf the add-on of synthetic slag charge is less than 12Kg/t Steel, then influence the sweetening effectiveness of slag; If the add-on of synthetic slag charge is more than 14Kg/t Steel, then the quantity of slag is excessive, with many consumed powers.In the synthetic slag charge of 100 weight parts, can comprise the CaO of 60～68 weight parts, the Al of 15～20 weight parts 2O 3, be no more than 5.0 weight parts and be not the SiO of 0 weight part 2, be no more than 3.0 weight parts and be not the MgO of 0 weight part, the CaF of 10～15 weight parts 2
Be that the add-on of silicon calcium powder can be 0.4Kg/t under the situation of silicon calcium powder as diffusion deoxidizer of 0.5～1.0mm using granularity Steel～0.8Kg/t SteelIf the add-on of silicon calcium powder is less than 0.4Kg/t Steel, abundant FeO, the MnO in the reduced blast furnace then, deoxidation effect is poor; If the add-on of silicon calcium powder is more than 0.8Kg/t Steel, then molten steel increases silicon easily.Silicon calcium powder comprises following component: 28%≤Ca≤35%, 50%≤Si≤65%, 0%＜C≤1.2%, 0%＜Al≤2.4%, 0%＜P≤0.04%, 0%＜S≤0.08% by weight percentage, all the other are unavoidable impurities, and each components contents sum is 100%.
According to the manufacture method of steel of the present invention, in tapping process, add sufficient pre-deoxidant in the ladle and carry out pre-deoxidation, make dissolved oxygen form Al fast 2O 3And oarse-grained complex inclusion, floating upward quickly enters in the slag, and the inclusion that remains in the steel also has the sufficient time fully to float in LF stove refining process.In addition, according to the manufacture method of steel of the present invention, in the refining of LF stove, need oxygen level at molten steel to carry out bulk deoxidation, the Al of formation to the aluminium of ladle feeding aequum under than higher state 2O 3Be mingled with morely relatively, assemble easily and grow up, the Argon through the LF stove long period stirs simultaneously, is fully discharged Al 2O 3Be mingled with.After white slag forms, no longer carry out bulk deoxidation to molten steel feeding aluminium, also do the end-deoxidizer deoxidation without aluminium, thus reduce as much as possible generate tiny dispersion be difficult to assemble the bigger Al of come-up difficulty that grows up 2O 3The amount of inclusion reaches the purpose of cleaning molten steel.
After FeO, MnO in the high basicity slag fully reduced, slag had become white slag, and the oxygen in the molten steel is constantly to the slag transmission at this moment, and FeO, MnO in the slag constantly are reduced, thereby have reduced the oxygen level of molten steel.In one embodiment, white slag was kept 15 minutes～30 minutes.The white slag hold-time is to begin to count from the time that slag becomes white slag.Because the oxygen in the molten steel needs the time to the slag mass transfer, so if the white slag hold-time is less than 15 minutes, then the deoxidation effect of molten steel is poor.If the white slag hold-time was longer than 30 minutes, then secondary oxidation easily takes place in high-temperature molten steel.
After white slag is kept 15 minutes～30 minutes, molten steel is carried out calcium handle, namely to high-melting-point Al residual in the molten steel 2O 3Be mingled with and carry out denaturing treatment, form low-melting calcium aluminate, improve the casting properties of molten steel with this.Specifically, can be with a kind of calcium alloy line feeding molten steel in iron calcium line, silicon-calcium wire and other calcium alloy lines, the amount of the calcium metal in the calcium alloy line of its feeding is 0.12Kg/t Steel～0.30Kg/t steel.If the amount of the calcium metal of feeding is less than 0.12Kg/t Steel, inclusion modification weak effect then; If the amount of the calcium metal of feeding is more than 0.30Kg/t Steel, then be easy to generate dystectic CaS and be mingled with.Before calcium was handled, the sulphur content of molten steel was controlled to be 0～0.012wt%, and full aluminium content is controlled to be 0.015～0.025wt%.Aluminium content height, sulphur content height then form dystectic calcium-aluminate and CaS easily, thereby the casting properties variation of molten steel.
Using silicon-calcium wire to carry out under the situation of calcium processing, the amount of the silicon-calcium wire of feeding molten steel can be 0.4Kg/t Steel～0.8Kg/t SteelSilicon-calcium wire comprises following component: 28%≤Ca≤35%, 50%≤Si≤65%, 0%＜C≤1.2%, 0%＜Al≤2.4%, 0%＜P≤0.04%, 0%＜S≤0.08% by weight percentage, all the other are unavoidable impurities, and each components contents sum is 100%.
In the mode of feeding the calcium alloy line to molten steel molten steel is carried out calcium and handle the form feeding of iron calcium line, silicon-calcium wire or other calcium alloy lines (for example with) afterwards, can be to molten steel soft blow argon 8 minutes～10 minutes.If the soft blow argon time is less than 8 minutes, then the calcium-aluminate of calcium processing formation is mingled with and can not fully discharges; If the soft blow argon time was longer than 10 minutes, then molten steel is easily air-breathing, produces secondary oxidation.
The refining of LF stove left standstill molten steel 10 minutes～15 minutes after finishing.Here " LF stove refining end " can refer to stop heating, and stops Argon, and molten steel is left standstill in ladle.In the process of leaving standstill, make the discharge of further floating of inclusion in the molten steel.If the molten steel time of repose is less than 10 minutes, then slag can not fully separate; If the molten steel time of repose was longer than 15 minutes, then liquid steel temperature reduces, the ordinary production of influence back operation.
In one embodiment, can add carburelant and/or iron alloy at the LF stove to molten steel between refining period, to satisfy the chemical ingredients requirement of molten steel.
Manufacture method according to steel of the present invention also can comprise the operation of molten steel being cast steel billet by continuous casting.
Manufacture method according to steel of the present invention also can be included in the refining of LF stove afterwards and other external refinings before continuous casting is operated, and for example VD handles, RH handles, DH handles etc.If use these furnace outer refining technologies, then should after refining, make molten steel leave standstill for some time, inclusion is fully discharged.
Therefore, in the manufacture method according to steel of the present invention, improve the purity of molten steel by multiple measure, thereby improved the casting properties of molten steel.
Below in conjunction with example the manufacture method according to steel of the present invention is elaborated.
Example 1:
Utilize 70 tons of high resistance ultra-high power electric arc furnaces to use according to the manufacture method of steel of the present invention and produce the 16Mn steel, its processing step is as follows:
First steel-making water is 69 tons in electric furnace.The aluminium ball and the Si-Al-Ba-Ca that add as pre-deoxidant in the ladle in tapping process carry out pre-deoxidation, and adopt argon bottom-blowing to stir, and wherein, the add-on of aluminium ball is steel 1.1Kg per ton, and the add-on of Si-Al-Ba-Ca is steel 3.5Kg per ton.To fill the ladle handling of molten steel then to LF stove refining station, feeding 30Kg aluminum steel adds synthetic slag charge by steel 13Kg per ton again.In the synthetic slag charge of 100 weight parts, contain CaO 65.4 weight parts, Al 2O 317.3 weight part, SiO 23.0 weight part, MgO 2.0 weight parts, CaF 212.1 weight part and unavoidable impurities.Then, fall electrode and begin heating, after treating that slag charge dissolves, adding is that silicon calcium powder (containing 32.3% Ca, 62.5% Si, 1.0% C, 2.1% Al, 0.03% P, 0.07% S and the unavoidable impurities) 30Kg of 0.5～1.0mm strengthens deoxidation as the granularity of diffusion deoxidizer, form white slag fast, the total amount of FeO and MnO is at 0.43wt% in the white slag, and basicity of slag is controlled 4, no longer feeds the aluminum steel deoxidation after white slag forms.The white slag hold-time is 18 minutes, afterwards, feeds silicon-calcium wire (composition of silicon-calcium wire is identical with the silicon calcium powder of use in the example 1) 35Kg to molten steel, and silico-calcium was handled back soft blow argon 10 minutes.After refining finishes, molten steel blow off argon after 10 minutes continuous casting open and water.The continuous casting casting is smooth, and the mouth of a river is dross not.
Example 2:
Utilize 70 tons of high resistance ultra-high power electric arc furnaces to use according to the manufacture method of steel of the present invention and produce the Q345B steel, its processing step is as follows:
First steel-making water is 72 tons in electric furnace.The aluminium ball and the Si-Al-Ba-Ca that add as pre-deoxidant in the ladle in tapping process carry out pre-deoxidation, and adopt argon bottom-blowing to stir, and wherein, the add-on of aluminium ball is steel 1.3Kg per ton, and the add-on of Si-Al-Ba-Ca is steel 3.1Kg per ton.To fill the ladle handling of molten steel then to LF stove refining station, feeding 40Kg aluminum steel adds synthetic slag charge by steel 12Kg per ton again.In the synthetic slag charge of 100 weight parts, contain CaO 65.4 weight parts, Al 2O 317.3 weight part, SiO 23.0 weight part, MgO 2.0 weight parts, CaF 212.1 weight part and unavoidable impurities.Then, fall electrode and begin heating, after treating that slag charge dissolves, adding is that silicon calcium powder (containing 32.3% Ca, 62.5% Si, 1.0% C, 2.1% Al, 0.03% P, 0.07% S and the unavoidable impurities) 40Kg of 0.5～1.0mm strengthens deoxidation as the granularity of diffusion deoxidizer, form white slag fast, the total amount of FeO and MnO is at 0.50wt% in the white slag, and basicity of slag is controlled 4.8, no longer feeds the aluminum steel deoxidation after white slag forms.The white slag hold-time is 20 minutes, afterwards, feeds silicon-calcium wire (composition of silicon-calcium wire is identical with the silicon calcium powder of use in the example 2) 45Kg to molten steel, and silico-calcium was handled back soft blow argon 8 minutes.After refining finishes, molten steel blow off argon after 12 minutes continuous casting open and water.The continuous casting casting is smooth, and the mouth of a river is dross not.
Example 3:
Utilize 70 tons of high resistance ultra-high power electric arc furnaces to use according to the manufacture method of steel of the present invention and produce B level steel, its processing step is as follows:
First steel-making water is 70 tons in electric furnace.The aluminium ball and the Si-Al-Ba-Ca that add as pre-deoxidant in the ladle in tapping process carry out pre-deoxidation, and adopt argon bottom-blowing to stir, and wherein, the add-on of aluminium ball is steel 1.4Kg per ton, and the add-on of Si-Al-Ba-Ca is steel 3.3Kg per ton.To fill the ladle handling of molten steel then to LF stove refining station, feeding 45Kg aluminum steel adds synthetic slag charge by steel 14Kg per ton again.In the synthetic slag charge of 100 weight parts, contain CaO 65.4 weight parts, Al 2O 317.3 weight part, SiO 23.0 weight part, MgO 2.0 weight parts, CaF 212.1 weight part and unavoidable impurities.Then, fall electrode and begin heating, after treating that slag charge dissolves, adding is that silicon calcium powder (containing 32.3% Ca, 62.5% Si, 1.0% C, 2.1% Al, 0.03% P, 0.07% S and the unavoidable impurities) 30Kg of 0.5～1.0mm strengthens deoxidation as the granularity of diffusion deoxidizer, form white slag fast, the total amount of FeO and MnO is at 0.31wt% in the white slag, and basicity of slag is controlled 3.5, no longer feeds the aluminum steel deoxidation after white slag forms.The white slag hold-time is 25 minutes, afterwards, feeds silicon-calcium wire (composition of silicon-calcium wire is identical with the silicon calcium powder of use in the example 3) 48Kg to molten steel, and silico-calcium was handled back soft blow argon 9 minutes.After refining finishes, molten steel blow off argon after 14 minutes continuous casting open and water.The continuous casting casting is smooth, and the mouth of a river is dross not.
Example 4:
Utilize 70 tons of high resistance ultra-high power electric arc furnaces to use according to the manufacture method of steel of the present invention and produce B level steel, its processing step is as follows:
First steel-making water is 70 tons in electric furnace.The aluminium ball that adds as pre-deoxidant in the ladle in tapping process carries out pre-deoxidation, and adopts argon bottom-blowing to stir, and wherein, the add-on of aluminium ball is steel 2.4Kg per ton.To fill the ladle handling of molten steel then to LF stove refining station, feeding 42Kg aluminum steel adds synthetic slag charge by steel 14Kg per ton again.In the synthetic slag charge of 100 weight parts, contain CaO 65.4 weight parts, Al 2O 317.3 weight part, SiO 23.0 weight part, MgO 2.0 weight parts, CaF 212.1 weight part and unavoidable impurities.Then, fall electrode and begin heating, after treating that slag charge dissolves, adding is that silicon calcium powder (containing 32.3% Ca, 62.5% Si, 1.0% C, 2.1% Al, 0.03% P, 0.07% S and the unavoidable impurities) 40Kg of 0.5～1.0mm strengthens deoxidation as the granularity of diffusion deoxidizer, form white slag fast, the total amount of FeO and MnO is at 0.5wt% in the white slag, and basicity of slag is controlled 5, no longer feeds the aluminum steel deoxidation after white slag forms.The white slag hold-time is 29 minutes, afterwards, feeds silicon-calcium wire (composition of silicon-calcium wire is identical with the silicon calcium powder of use in the example 4) 49Kg to molten steel, and silico-calcium was handled back soft blow argon 8 minutes.After refining finishes, molten steel blow off argon after 10 minutes continuous casting open and water.The continuous casting casting is smooth, and the mouth of a river is dross not.
According to the manufacture method of steel of the present invention, cleaning molten steel can effectively prevent the dross at the mouth of a river.In addition, the manufacture method of steel of the present invention is simple and easy to operate, has taken full advantage of existing technical process and equipment, does not need equipment is added or transforms, and has good application prospects.

Claims (11)

1. the manufacture method of a steel, described manufacture method may further comprise the steps:
First steel-making water;
Add pre-deoxidant to ladle to the process of ladle tapping;
Refined molten steel in the LF stove,
Wherein, in the LF stove in the process of refined molten steel, aluminium added carry out bulk deoxidation in the molten steel, to synthesize slag charge then and join in the ladle, heat afterwards, after the slag charge fusing to be synthesized, add diffusion deoxidizer in the ladle and strengthen deoxidation, form white slag afterwards, the FeO in the described white slag and the total amount of MnO are 0 ~ 0.5wt%, and the basicity of white slag is 3 ~ 5;
White slag was kept 15 minutes ~ 30 minutes;
After white slag is kept 15 minutes ~ 30 minutes, in the mode of feeding the calcium alloy line to molten steel molten steel to be carried out calcium and handle, the amount of the calcium metal in the calcium alloy line of feeding is 0.12Kg/t Steel~ 0.30Kg/t Steel, calcium was handled back soft blow argon 8 minutes ~ 10 minutes.
2. manufacture method according to claim 1 is characterized in that pre-deoxidant is aluminium and silicon-aluminium-barium-calcium alloy, and the add-on of aluminium is 1Kg/t Steel～1.5Kg/t Steel, the add-on of silicon-aluminium-barium-calcium alloy is 3Kg/t Steel~ 3.5Kg/t Steel,
Silicon-aluminium-barium-calcium alloy comprises following component: 50%≤Si≤55%, 8%≤Ca≤14%, 8%≤Al≤14%, 8%≤Ba≤14%, 0%＜S≤0.05%, 0%＜P≤0.05%, 0%＜C≤2.0% by weight percentage, and surplus is Fe and unavoidable impurities.
3. manufacture method according to claim 1 is characterized in that pre-deoxidant is aluminium, and the add-on of aluminium is 2.2Kg/t Steel~ 2.5Kg/t Steel
4. manufacture method according to claim 1, it is characterized in that aluminium is added carry out bulk deoxidation in the molten steel before, the total oxygen content in the molten steel is 0.0060wt% ~ 0.0120wt%.
5. manufacture method according to claim 4 is characterized in that aluminium is added the step of carrying out bulk deoxidation in the molten steel to be comprised: with 0.4Kg/t Steel～0.8Kg/t SteelAmount aluminum steel fed carry out bulk deoxidation in the molten steel.
6. manufacture method according to claim 1 is characterized in that the add-on of synthetic slag charge is 12Kg/t Steel~ 14Kg/t Steel,
In the synthetic slag charge of 100 weight parts, comprise the CaO of 60 ~ 68 weight parts, the Al of 15 ~ 20 weight parts 2O 3, be no more than 5.0 weight parts and be not the SiO of 0 weight part 2, be no more than 3.0 weight parts and be not the MgO of 0 weight part, the CaF of 10 ~ 15 weight parts 2
7. manufacture method according to claim 1 is characterized in that diffusion deoxidizer is that granularity is the silicon calcium powder of 0.5 ~ 1.0mm, and the add-on of silicon calcium powder is 0.4Kg/t Steel～0.8Kg/t Steel,
Silicon calcium powder comprises following component: 28%≤Ca≤35%, 50%≤Si≤65%, 0%＜C≤1.2%, 0%＜Al≤2.4%, 0%＜P≤0.04%, 0%＜S≤0.08% by weight percentage, all the other are unavoidable impurities, and each components contents sum is 100%.
8. manufacture method according to claim 1 is characterized in that the sulphur content of molten steel is controlled to be 0 ~ 0.012wt% before carrying out the calcium processing, and full aluminium content is controlled to be 0.015 ~ 0.025wt%.
9. manufacture method according to claim 1 is characterized in that described method also comprises: after soft blow argon 8 minutes ~ 10 minutes, stop the soft blow argon and molten steel was left standstill 10 minutes ~ 15 minutes.
10. manufacture method according to claim 9 is characterized in that described method also comprises: making after molten steel leaves standstill 10 minutes ~ 15 minutes, by continuous casting molten steel is cast steel billet.
11. manufacture method according to claim 1 is characterized in that in the mode of feeding the calcium alloy line to molten steel the step that molten steel carries out the calcium processing being comprised: with 0.4Kg/t Steel～0.8Kg/t SteelAmount silicon-calcium wire is fed molten steel, silicon-calcium wire comprises following component: 28%≤Ca≤35%, 50%≤Si≤65%, 0%＜C≤1.2%, 0%＜Al≤2.4%, 0%＜P≤0.04%, 0%＜S≤0.08% by weight percentage, all the other are unavoidable impurities, and each components contents sum is 100%.
CN 201110221641 2011-08-03 2011-08-03 Manufacturing method of steel Expired - Fee Related CN102277471B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201110221641 CN102277471B (en) 2011-08-03 2011-08-03 Manufacturing method of steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201110221641 CN102277471B (en) 2011-08-03 2011-08-03 Manufacturing method of steel

Publications (2)

Publication Number Publication Date
CN102277471A CN102277471A (en) 2011-12-14
CN102277471B true CN102277471B (en) 2013-09-11

Family

ID=45103198

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201110221641 Expired - Fee Related CN102277471B (en) 2011-08-03 2011-08-03 Manufacturing method of steel

Country Status (1)

Country Link
CN (1) CN102277471B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105349731B (en) * 2015-12-07 2017-07-07 攀钢集团成都钢钒有限公司 The method of refining of high-quality scraping cylinder body steel
CN106270422A (en) * 2016-09-20 2017-01-04 河钢股份有限公司承德分公司 Improve high-carbon steel continuous casting and open the method watering effect
CN110938729B (en) * 2019-12-09 2021-10-08 北京首钢吉泰安新材料有限公司 Deoxidizer for smelting nickel-chromium steel by electroslag furnace and deoxidation method thereof
CN113186372A (en) * 2021-04-29 2021-07-30 成渝钒钛科技有限公司 Deoxidation method of silicon-containing wire drawing steel
CN113718085A (en) * 2021-08-17 2021-11-30 舞阳钢铁有限责任公司 Refining method of aluminum deoxidized steel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1778974A (en) * 2004-11-17 2006-05-31 首钢总公司 Deoxidization of calcium-silicon barium for smelting 82B steel
CN1858266A (en) * 2005-05-01 2006-11-08 新疆八一钢铁集团有限责任公司 SAE 1008 deoxidizing process
CN101545066A (en) * 2009-05-12 2009-09-30 攀钢集团成都钢铁有限责任公司 Method for smelting H2S corrosion resistant petroleum casing pipe steel 110S
CN101880747A (en) * 2009-05-06 2010-11-10 鞍钢股份有限公司 Clean steel production method for reducing molten steel total oxygen content
CN102021276A (en) * 2010-11-25 2011-04-20 攀钢集团钢铁钒钛股份有限公司 Method for controlling aluminum component in steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1778974A (en) * 2004-11-17 2006-05-31 首钢总公司 Deoxidization of calcium-silicon barium for smelting 82B steel
CN1858266A (en) * 2005-05-01 2006-11-08 新疆八一钢铁集团有限责任公司 SAE 1008 deoxidizing process
CN101880747A (en) * 2009-05-06 2010-11-10 鞍钢股份有限公司 Clean steel production method for reducing molten steel total oxygen content
CN101545066A (en) * 2009-05-12 2009-09-30 攀钢集团成都钢铁有限责任公司 Method for smelting H2S corrosion resistant petroleum casing pipe steel 110S
CN102021276A (en) * 2010-11-25 2011-04-20 攀钢集团钢铁钒钛股份有限公司 Method for controlling aluminum component in steel

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
J55管坯钢92t钢包炉(LF)精炼工艺实践;王海兵;《特殊钢》;20051021(第05期);第60页第4、5段，第61页第1段、第5段第5-6行 *
王海兵.J55管坯钢92t钢包炉(LF)精炼工艺实践.《特殊钢》.2005,(第05期),
王海兵.LF炉管坯钢精炼技术.《四川冶金》.2005,(第06期), *

Also Published As

Publication number Publication date
CN102277471A (en) 2011-12-14

Similar Documents

Publication Publication Date Title
CN106148844B (en) A kind of preparation method of sulfur-bearing ultralow titanium high standard bearing steel
CN103451349B (en) Control method for preventing nozzle clogging in casting process of ultra-low carbon-aluminium deoxidized molten steel
CN103205524B (en) Method for smelting low-sulfur steel from semi-steel
CN100569969C (en) The ferrosilicon smelting waste utilizes technology in manganese alloy smelting
CN104946972B (en) Steel disc strip for diode lead and production technology of steel disc strip
CN106636953A (en) Method for smelting martensitic stainless steel P91 for boiler pipe
CN102268513B (en) Method for improving castability of molten steel of medium and low carbon steel
CN103469049B (en) Molybdenum oxide DIRECT ALLOYING process for making
CN104212935B (en) A kind of method with high titanium ferrochrome production high-quality GCr15 bearing steel
CN104831153B (en) The preparation method of V150 grade of steel high-strength tenacity casing steels
CN105132612B (en) Converter less slag smelting early stage deslagging control method
CN102994871B (en) Method for smelting medium/high-carbon hard-wired steel by vanadium-titanium containing molten iron
CN105018855B (en) Method for producing circular sulfur-resistant pipeline steel billet for oil and gas collection and transmission
CN107841687B (en) A kind of smelting process of ultralow boron steel
CN102277471B (en) Manufacturing method of steel
CN104004881A (en) Method for controlling nitrogen content in process of producing aluminium deoxidation high-carbon steel
CN105525055A (en) Method for controlling splashing in less slag smelting decarbonization period of converter
CN105861775A (en) Smelting process for ultra-low phosphorus steel with high nickel content
CN102329917B (en) Production method of clean steel
CN107201422A (en) A kind of production method of mild steel
CN107653358A (en) The method of the quick deoxidation of LF refining furnace smelting process
CN108588326A (en) A kind of method that vanadium-bearing hot metal smelts high strength welding wire steel ER80-G
CN107365949A (en) A kind of method of smelting ultralow-carbon high-alloy stainless steel
CN108118115B (en) A kind of method of VD process smelting high carbon chromium bearing steel
CN101613786B (en) Boron-containing modifier for ladle covering slag and use method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130911

Termination date: 20170803

CF01 Termination of patent right due to non-payment of annual fee