CN102876845A - Method for producing ultra-low phosphorus steel through applying pre-melting calcium ferrite to refine outside LF (Ladle Furnace) molten steel furnace - Google Patents
Method for producing ultra-low phosphorus steel through applying pre-melting calcium ferrite to refine outside LF (Ladle Furnace) molten steel furnace Download PDFInfo
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- CN102876845A CN102876845A CN201210226169XA CN201210226169A CN102876845A CN 102876845 A CN102876845 A CN 102876845A CN 201210226169X A CN201210226169X A CN 201210226169XA CN 201210226169 A CN201210226169 A CN 201210226169A CN 102876845 A CN102876845 A CN 102876845A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a method for producing ultra-low phosphorus steel through applying pre-melting calcium ferrite to refine outside an LF (ladle furnace) molten steel furnace. The method mainly the following steps: tapping through a converter, deeply removing phosphorus through an LF refining furnace (carrying out argon stirring on molten steel in the whole refining and phosphorus removal process), drossing, adjusting temperature and stirring, deoxidizing, refining, alloying and continuously casting. Deep phosphorus removal is carried out through the method, so that the phosphorus removal rate is more than 80%, the phosphorus content in the molten steel is lower than 0.003%, the phosphorus removal efficiency is high and stable, the smelting intensity of the converter is reduced, the service life of the converter is increased, and meanwhile, the lime consumption and the oxygen consumption are reduced, the electric energy is saved, the consumption of a steel material is reduced, and the metal yield is improved.
Description
Technical field
The invention belongs to metallurgical technology field, be used in the external refining process, use the pre-molten calcium ferrite and remove phosphorus in the steel, especially use the pre-molten calcium ferrite and carry out producing in the molten steel furnace external refining process method of ultra-low phosphoretic steel at LF refining furnace (Ladle Furnace ladle refining furnace).
Background technology
Phosphorus harmful element normally in steel because the segregation of phosphorus in steel is more serious, degenerates steel toughness, produces " cold short " phenomenon, especially under cold condition, and easier generation " cold short ".The segregation of phosphorus also can cause the anisotropy of steel, reduces welding property, causes stainless corrosion fatigue, therefore will strictly control.In conventional art, the phosphorus general requirement in the steel is controlled at below 0.02%, but along with the fast development of science and technology, senior high-quality steel to steel material metallurgical quality requires to improve constantly, and especially phosphorus content in the steel is proposed harsher requirement.Phosphorus content in some Cryogenic Steel, marine steel, anti-hydrogen crackle steel and the part Plate Steel requirement steel is less than 0.01% even 0.005%; In order to prevent that austenitic stainless steel from producing stress corrosion cracking, require in the steel phosphorus content less than 0.005%.
Steel mill adopts " double slag process " mostly at present, namely adopts twice slag making in converter smelting; Or " duplex practice ", pour the method for proceeding to smelt in another block converter into after namely taking a block converter with the molten iron smelting half the time, the deficiency of these two kinds of methods is complex process, and tap to tap time is long, and converter productivity can not be not fully exerted.Also having a kind of mode is that molten iron is carried out " three take off " in advance, be desiliconization, desulfurization, dephosphorization, iron and steel enterprise such as Japan, its deficiency is need be many with equipment, investment is large, complex process, heat waste are large, and because the molten iron temperature after " three take off " is low, the steel scrap amount that adds when making converter smelting greatly reduces.Therefore, in order to produce these low-phosphorous, ultra-low phosphoretic steels, conventional converter smelting method can not satisfy these steel grades to the requirement of phosphorus, assists the method for coming dephosphorization with external refining so require study, thereby realizes producing ultra-low phosphoretic steel.
Summary of the invention
The present invention be directed to that above-mentioned problems of the prior art propose, its objective is provides a kind of application pre-molten calcium ferrite to carry out the molten steel furnace external refining dephosphorization at the LF refining furnace, phosphorus content in the molten steel can be stablized and be controlled at below 0.003%, successful, stable, and guarantee and improve the quality of refining steel, reduce the processing method of the manufacturing ultra-low phosphoretic steel with outside-stove refining dephosphorization of smelting cost.
In order to reach the foregoing invention purpose, technical scheme of the present invention is as follows, and the method that application pre-molten calcium ferrite carries out LF molten steel furnace external refining production ultra-low phosphoretic steel mainly may further comprise the steps:
(1) converter tapping: converter smelting is controlled at the converter terminal phosphorus content below 0.03% after finishing, and tapping temperature is controlled at 1550 ℃～1680 ℃, molten steel is not carried out deoxidation treatment in the tapping process, and adopts pushing off the slag to process in the tapping process;
(2) LF refining furnace deep dephosphorization: ladle is transported to LF refining station, at first opens the argon gas valve and carries out the Argon stirring, then adds the pre-molten calcium ferrite in ladle, all will carry out Argon to molten steel in the whole refining dephosphorization process and stir;
(3) skim: after refining dephosphorization finishes ladle is transported to the station of skimming, utilize slag removal machine with dephosphorization treatment after the slag on molten steel surface remove, then add ladle covering agent;
(4) temperature adjustment and stirring: at the LF refining furnace molten steel is carried out temperature adjustment processing and stir process, liquid steel temperature should be controlled at 1570 ℃～1600 ℃ after processing finished;
(6) deoxidation, refining, Alloying Treatment: add reductor in the molten steel according to different steel grade smelting requirements and carry out deoxidation treatment, deoxidation is carried out refining treatment after finishing, add alloy to molten steel more afterwards and carry out the alloying operation, also will carry out the argon gas stirring operation in deoxidation, refining and the alloying process;
(7) continuous casting: adopt the whole process protection cast.
Wherein, described pushing off the slag processing is to adopt any one mode in floating plug, slag-blocking ball or the slag stop cone to realize.
The adding mode of described pre-molten calcium ferrite can be that one or many adds molten steel, and the adding mode can be by bin blanking or artificial the input.
Described pre-molten calcium ferrite consumption is controlled at 3～20Kg/ ton steel, and granularity is controlled at 0.1mm～100mm.
Its main image of described pre-molten calcium ferrite consists of CaOFe
2O
3, 2CaOFe
2O
3, CaO2Fe
2O
3One or more mixture, and other inevitable impurity.
Described Argon in the LF refining process is processed, and the flow control of argon gas is at 10～500NL/min (standard Liter Per Minute), and the treatment time is controlled at 1～15min.
Described skimming carried out at the station of skimming, and adopts any one equipment in vacuum dreg-sucking machine or the mechanical slag removal machine to realize.
The add-on of described ladle covering agent is controlled at 1～10Kg/ ton steel.
Argon gas in described deoxidation, refining, the Alloying Treatment process stirs flow at 1～100NL/min.
In addition, it is worth mentioning that: the preparation method of the dephosphorizing agent pre-molten calcium ferrite among the present invention mainly may further comprise the steps:
The first step: prepare raw material, raw material comprises the material that is rich in calcium oxide and the material that is rich in ferric oxide;
Second step: the raw material of preparing in the first step is made respectively powder;
The 3rd step: mix, the powder for preparing in the second step is mixed by a certain percentage;
The 4th step: melting, the powder that mixes is added in the high temperature kiln, carry out melting 1450～1600 ℃ of temperature;
The 5th step: come out of the stove post crystallization cooling of melting;
The 6th step: broken moulding, through fragmentation, make and be rich in CaO and Fe
2O
3, granularity is the calcareous pre-molten dephosphorizing agent of low melting point iron of 0.1～100mm.
Wherein, the various trade wastes such as carbide slag, calcium lime powder, paper white sludge, calcium powder that comprise the raw mineral materialss such as calcite, Wingdale, rhombspar and be rich in calcium oxide of the material that is rich in calcium oxide in the raw material.The material that is rich in ferric oxide in the raw material comprises the trade wastes such as the iron sheet that is rich in ferric oxide that produces in the raw mineral materialss such as powdered iron ore and the Industrial processes, iron scale, dirt mud.Trade waste is chief component in the above-mentioned raw materials, and raw mineral materials is less important integral part.And the weight percentage ranges of above-mentioned two class materials is respectively: the material that is rich in ferric oxide is 30%～70%; The material that is rich in calcium oxide is 30%～70%.
The composition range of the calcareous pre-molten dephosphorizing agent of the steely iron for preparing at last, product is: CaO 25～75%, Fe
2O
325～75%, SiO
2≤ 8%, F
-≤ 2%, content of impurities≤5%.
Use method of the present invention to carry out deep dephosphorization, its dephosphorization rate can reach more than 80%, can make in the steel that phosphorus element content is stable to be controlled at below 0.003%.Compared with prior art, dephosphorization efficient is high and stable, alleviates converter smelting intensity, increases life of converter, can also reduce lime consumption simultaneously, reduce oxygen consumption, saves energy, and reduce iron and steel stock consumption, has improved recovery rate of iron.And because the raw material of pre-molten dephosphorizing agent is mainly taken from trade waste, so that refuse reclamation can further reduce production costs.
Embodiment
Below, describe the preferred embodiments of the present invention in detail.Need to prove before this, employed term or word can not limited interpretation be the implication in common implication or the dictionary in this specification and claims book, and should be based in order to illustrate that in the best way principle that its invention contriver can suitably define the concept of term is interpreted as meeting implication and the concept of the technology of the present invention thought.Thereupon, the structure that represents among the embodiment that this specification sheets is put down in writing is one of most preferred embodiment of the present invention, can not represent technological thought of the present invention fully, therefore should be understood that to have for the present invention various equivalents and the variation that can replace.
The below illustrates method of the present invention and produce an effect thereof with several specific embodiments.
Embodiment 1:
After converter smelting finished, the converter terminal phosphorus content was controlled at below 0.03%, and tapping temperature is controlled at about 1580 ℃, molten steel is not carried out deoxidation treatment in the tapping process, and adopted pushing off the slag to process in the tapping process; After having gone out steel ladle is transported to LF refining station, molten steel is carried out Argon to be stirred, the flow control of argon gas is at 50NL/min, by feed bin is disposable the pre-molten calcium ferrite is added molten steel, pre-molten calcium ferrite consumption is controlled at 5Kg/ ton steel, and granularity is controlled at 0.1mm～100mm, and the refining treatment time is controlled at 12～15min, refining treatment finishes to stop argon gas and stirs, and ladle is left LF refining station; Ladle is transported to the station of skimming, utilize slag removal machine with dephosphorization treatment after the slag on molten steel surface remove, then add the ladle covering agent of 2Kg/ ton steel; Again ladle is transported to refining furnace molten steel is carried out the temperature adjustment processing, liquid steel temperature should be controlled at 1570 ℃～1600 ℃; Then add reductor in the molten steel and carry out deoxidation treatment, deoxidation is carried out refining treatment after finishing, and then adds alloy to molten steel and carries out the alloying operation; All will carry out the Argon stir process in whole temperature adjustment, deoxidation, refining and the alloying process, argon flow amount is 100NL/min; Continuous casting adopts the whole process protection cast.
Embodiment 2:
After converter smelting finished, the converter terminal phosphorus content was controlled at below 0.03%, and tapping temperature is controlled at about 1620 ℃, molten steel is not carried out deoxidation treatment in the tapping process, and adopted pushing off the slag to process in the tapping process; After having gone out steel ladle is transported to LF refining station, molten steel is carried out Argon to be stirred, the flow control of argon gas is at 100NL/min, by feed bin is disposable the pre-molten calcium ferrite is added molten steel, pre-molten calcium ferrite consumption is controlled at 8Kg/ ton steel, and granularity is controlled at 0.1mm～100mm, and the refining treatment time is controlled at 9～12min, refining treatment finishes to stop argon gas and stirs, and ladle is left LF refining station; Ladle is transported to the station of skimming, utilize slag removal machine with dephosphorization treatment after the slag on molten steel surface remove, then add the ladle covering agent of 4Kg/ ton steel; Again ladle is transported to refining furnace molten steel is carried out the temperature adjustment processing, liquid steel temperature should be controlled at 1570 ℃～1600 ℃; Then add reductor in the molten steel and carry out deoxidation treatment, deoxidation is carried out refining treatment after finishing, and then adds alloy to molten steel and carries out the alloying operation; All will carry out the Argon stir process in whole temperature adjustment, deoxidation, refining and the alloying process, argon flow amount is 80NL/min; Continuous casting adopts the whole process protection cast.
Embodiment 3:
After converter smelting finished, the converter terminal phosphorus content was controlled at below 0.03%, and tapping temperature is controlled at about 1650 ℃, molten steel is not carried out deoxidation treatment in the tapping process, and adopted pushing off the slag to process in the tapping process; After having gone out steel ladle is transported to LF refining station, molten steel is carried out Argon to be stirred, the flow control of argon gas is at 180NL/min, by feed bin is disposable the pre-molten calcium ferrite is added molten steel, pre-molten calcium ferrite consumption is controlled at 10Kg/ ton steel, and granularity is controlled at 0.1mm～100mm, and the refining treatment time is controlled at 7～9min, refining treatment finishes to stop argon gas and stirs, and ladle is left LF refining station; Ladle is transported to the station of skimming, utilize slag removal machine with dephosphorization treatment after the slag on molten steel surface remove, then add the ladle covering agent of 5Kg/ ton steel; Again ladle is transported to refining furnace molten steel is carried out the temperature adjustment processing, liquid steel temperature should be controlled at 1570 ℃～1600 ℃; Then add reductor in the molten steel and carry out deoxidation treatment, deoxidation is carried out refining treatment after finishing, and then adds alloy to molten steel and carries out the alloying operation; All will carry out the Argon stir process in whole temperature adjustment, deoxidation, refining and the alloying process, argon flow amount is 50NL/min; Continuous casting adopts the whole process protection cast.
Embodiment 4:
After converter smelting finished, the converter terminal phosphorus content was controlled at below 0.03%, and tapping temperature is controlled at about 1660 ℃, molten steel is not carried out deoxidation treatment in the tapping process, and adopted pushing off the slag to process in the tapping process; After having gone out steel ladle is transported to LF refining station, molten steel is carried out Argon to be stirred, the flow control of argon gas is at 270NL/min, at twice the pre-molten calcium ferrite is added molten steel by feed bin, the processing initial stage adds half pre-molten calcium ferrite, refining treatment proceeds to a half and adds second half pre-molten calcium ferrite again, the total consumption of pre-molten calcium ferrite is controlled at 12Kg/ ton steel, granularity is controlled at 0.1mm～100mm, the refining treatment time is controlled at 5～7min, refining treatment finishes to stop argon gas and stirs, and ladle is left LF refining station; Ladle is transported to the station of skimming, utilize slag removal machine with dephosphorization treatment after the slag on molten steel surface remove, then add the ladle covering agent of 7Kg/ ton steel; Again ladle is transported to refining furnace molten steel is carried out the temperature adjustment processing, liquid steel temperature should be controlled at 1570 ℃～1600 ℃; Then add reductor in the molten steel and carry out deoxidation treatment, deoxidation is carried out refining treatment after finishing, and then adds alloy to molten steel and carries out the alloying operation; All will carry out the Argon stir process in whole temperature adjustment, deoxidation, refining and the alloying process, argon flow amount is 30NL/min; Continuous casting adopts the whole process protection cast.
Embodiment 5:
After the stove of walking around was smelted and finished, the converter terminal phosphorus content was controlled at below 0.03%, and tapping temperature is controlled at about 1670 ℃, molten steel is not carried out deoxidation treatment in the tapping process, and adopted pushing off the slag to process in the tapping process; After having gone out steel ladle is transported to LF refining station, molten steel is carried out Argon to be stirred, the flow control of argon gas is at 350NL/min, at twice the pre-molten calcium ferrite is added molten steel by feed bin, the processing initial stage adds half pre-molten calcium ferrite, refining treatment proceeds to a half and adds second half pre-molten calcium ferrite again, the total consumption of pre-molten calcium ferrite is controlled at 15Kg/ ton steel, granularity is controlled at 0.1mm～100mm, the refining treatment time is controlled at 3～5min, refining treatment finishes to stop argon gas and stirs, and ladle is left LF refining station; Ladle is transported to the station of skimming, utilize slag removal machine with dephosphorization treatment after the slag on molten steel surface remove, then add the ladle covering agent of 8Kg/ ton steel; Again ladle is transported to refining furnace molten steel is carried out the temperature adjustment processing, liquid steel temperature should be controlled at 1570 ℃～1600 ℃; Then add reductor in the molten steel and carry out deoxidation treatment, deoxidation is carried out refining treatment after finishing, and then adds alloy to molten steel and carries out the alloying operation; All will carry out the Argon stir process in whole temperature adjustment, deoxidation, refining and the alloying process, argon flow amount is 20NL/min; Continuous casting adopts the whole process protection cast.
Embodiment 6:
After converter smelting finished, the converter terminal phosphorus content was controlled at below 0.03%, and tapping temperature is controlled at about 1680 ℃, molten steel is not carried out deoxidation treatment in the tapping process, and adopted pushing off the slag to process in the tapping process; After having gone out steel ladle is transported to LF refining station, molten steel is carried out Argon to be stirred, the flow control of argon gas is at 480NL/min, by feed bin is disposable the pre-molten calcium ferrite is added molten steel, pre-molten calcium ferrite consumption is controlled at 20Kg/ ton steel, and granularity is controlled at 0.1mm～100mm, and the refining treatment time is controlled at 2～4min, refining treatment finishes to stop argon gas and stirs, and ladle is left LF refining station; Ladle is transported to the station of skimming, utilize slag removal machine with dephosphorization treatment after the slag on molten steel surface remove, then add the ladle covering agent of 10Kg/ ton steel; Again ladle is transported to refining furnace molten steel is carried out the temperature adjustment processing, liquid steel temperature should be controlled at 1570 ℃～1600 ℃; Then add reductor in the molten steel and carry out deoxidation treatment, deoxidation is carried out refining treatment after finishing, and then adds alloy to molten steel and carries out the alloying operation; All will carry out the Argon stir process in whole temperature adjustment, deoxidation, refining and the alloying process, argon flow amount is 10NL/min; Continuous casting adopts the whole process protection cast.
Above embodiment 1～6th makes steel at 100 tons of converters, 100 tons of LF refining furnaces and 100 tons of LF refining furnaces, and its deep dephosphorization effect sees Table 1.
Table 1 is used the pre-molten calcium ferrite and is carried out external refining deep dephosphorization result
| Embodiment | Initial phosphorus, % | Finished product phosphorus, % | Dephosphorization rate, % |
| Embodiment 1 | 0.02 | 0.0022 | 89.0 |
| Embodiment 2 | 0.017 | 0.0028 | 83.5 |
| Embodiment 3 | 0.023 | 0.0026 | 88.7 |
| Embodiment 4 | 0.019 | 0.0018 | 90.5 |
| Embodiment 5 | 0.026 | 0.0027 | 89.6 |
| Embodiment 6 | 0.021 | 0.003 | 85.7 |
This shows, use the dephosphorization rate of the steel that method of the present invention produces high, and technique is clear, equipment is simple, is suitable for industrial production and popularization.
Be described and illustrate with reference to embodiment although it should be noted that the present invention, and in embodiment, provided and use the pre-molten calcium ferrite and carry out the concrete technology step that the LF molten steel furnace external refining is produced the method for ultra-low phosphoretic steel.But and do not mean that the present invention is limited to the embodiment of these descriptions.Those skilled in the art can therefrom derive many different variants, and they all will be covered in the true spirit and scope of claim of the present invention.
Claims (9)
1. use the method that the pre-molten calcium ferrite carries out LF molten steel furnace external refining production ultra-low phosphoretic steel for one kind, it is characterized in that:
The method mainly may further comprise the steps:
(1) converter tapping: converter smelting is controlled at the converter terminal phosphorus content below 0.03% after finishing, and tapping temperature is controlled at 1550 ℃～1680 ℃, molten steel is not carried out deoxidation treatment in the tapping process, and adopts pushing off the slag to process in the tapping process;
(2) LF refining furnace deep dephosphorization: ladle is transported to LF refining station, at first opens the argon gas valve and carries out the Argon stirring, then adds the pre-molten calcium ferrite in ladle, all will carry out Argon to molten steel in the whole refining dephosphorization process and stir;
(3) skim: after refining dephosphorization finishes ladle is transported to the station of skimming, utilize slag removal machine with dephosphorization treatment after the slag on molten steel surface remove, then add ladle covering agent;
(4) temperature adjustment and stirring: at the LF refining furnace molten steel is carried out temperature adjustment processing and stir process, liquid steel temperature should be controlled at 1570 ℃～1600 ℃ after processing finished;
(5) deoxidation, refining, Alloying Treatment: add reductor in the molten steel according to different steel grade smelting requirements and carry out deoxidation treatment, deoxidation is carried out refining treatment after finishing, add alloy to molten steel more afterwards and carry out the alloying operation, also will carry out the argon gas stirring operation in deoxidation, refining and the alloying process;
(6) continuous casting: adopt the whole process protection cast.
2. application pre-molten calcium ferrite according to claim 1 carries out the method that the LF molten steel furnace external refining is produced ultra-low phosphoretic steel, it is characterized in that: it is to adopt any one mode in floating plug, slag-blocking ball or the slag stop cone to realize that the pushing off the slag described in the first step is processed.
3. application pre-molten calcium ferrite according to claim 1 and 2 carries out the method that the LF molten steel furnace external refining is produced ultra-low phosphoretic steel, it is characterized in that: the adding mode of the pre-molten calcium ferrite described in the second step can be that one or many adds molten steel, and the adding mode can be by bin blanking or artificial the input.
4. application pre-molten calcium ferrite according to claim 3 carries out the method that the LF molten steel furnace external refining is produced ultra-low phosphoretic steel, and it is characterized in that: described pre-molten calcium ferrite consumption is controlled at 3～20Kg/ ton steel, and granularity is controlled at 0.1mm～100mm.
5. application pre-molten calcium ferrite according to claim 4 carries out the method that the LF molten steel furnace external refining is produced ultra-low phosphoretic steel, and it is characterized in that: its main image of described pre-molten calcium ferrite consists of CaOFe
2O
3, 2CaOFe
2O
3, CaO2Fe
2O
3One or more mixture, and other inevitable impurity.
6. application pre-molten calcium ferrite according to claim 5 carries out the method that the LF molten steel furnace external refining is produced ultra-low phosphoretic steel, it is characterized in that: described Argon in the LF refining process is processed, the flow control of argon gas is at 10～500NL/min, and the treatment time is controlled at 1～15min.
7. application pre-molten calcium ferrite according to claim 6 carries out the method that the LF molten steel furnace external refining is produced ultra-low phosphoretic steel, and it is characterized in that: described skimming carried out at the station of skimming, and adopts any one equipment in vacuum dreg-sucking machine or the mechanical slag removal machine to realize.
8. application pre-molten calcium ferrite according to claim 7 carries out the method that the LF molten steel furnace external refining is produced ultra-low phosphoretic steel, and it is characterized in that: the add-on of described ladle covering agent is controlled at 1～10Kg/ ton steel.
9. application pre-molten calcium ferrite according to claim 8 carries out the method that the LF molten steel furnace external refining is produced ultra-low phosphoretic steel, it is characterized in that: the argon gas in described deoxidation, refining, the Alloying Treatment process stirs flow at 1～100NL/min.
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| CN103938069A (en) * | 2014-03-19 | 2014-07-23 | 唐山国丰钢铁有限公司 | LF refining dephosphorization production process for low-phosphorus low-carbon steel |
| CN104032095A (en) * | 2014-06-19 | 2014-09-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel dephosphorizing agent and method for dephosphorizing molten steel |
| CN104046748A (en) * | 2014-06-19 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel dephosphorizing agent and molten steel dephosphorizing method |
| CN107557534A (en) * | 2017-10-31 | 2018-01-09 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of extremely low phosphoretic steel |
| CN107604120A (en) * | 2017-09-12 | 2018-01-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-phosphorous low-sulfur method for making steel |
| CN107723415A (en) * | 2017-10-31 | 2018-02-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of the ultralow phosphorus ultra-low-carbon steel of super-low sulfur |
| CN107746907A (en) * | 2017-10-31 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | The production method of clean steel |
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