JPH04268012A - Production of clean steel - Google Patents
Production of clean steelInfo
- Publication number
- JPH04268012A JPH04268012A JP3026404A JP2640491A JPH04268012A JP H04268012 A JPH04268012 A JP H04268012A JP 3026404 A JP3026404 A JP 3026404A JP 2640491 A JP2640491 A JP 2640491A JP H04268012 A JPH04268012 A JP H04268012A
- Authority
- JP
- Japan
- Prior art keywords
- dephosphorizing
- converter
- refining
- ladle
- steel
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000007670 refining Methods 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 18
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 35
- 229910052751 metal Inorganic materials 0.000 claims description 35
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 6
- 235000012255 calcium oxide Nutrition 0.000 claims description 6
- 238000005261 decarburization Methods 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- 239000010459 dolomite Substances 0.000 claims description 5
- 229910000514 dolomite Inorganic materials 0.000 claims description 5
- 239000011574 phosphorus Substances 0.000 claims description 5
- 239000010802 sludge Substances 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 abstract description 9
- 239000001301 oxygen Substances 0.000 abstract description 9
- 238000011282 treatment Methods 0.000 abstract description 9
- 239000003795 chemical substances by application Substances 0.000 abstract description 6
- 238000007872 degassing Methods 0.000 abstract description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 4
- 239000007789 gas Substances 0.000 abstract description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 2
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 2
- 239000010436 fluorite Substances 0.000 abstract description 2
- 239000004571 lime Substances 0.000 abstract description 2
- 235000017550 sodium carbonate Nutrition 0.000 abstract description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 12
- 229910052742 iron Inorganic materials 0.000 abstract 6
- 230000003009 desulfurizing effect Effects 0.000 abstract 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 229910052717 sulfur Inorganic materials 0.000 description 7
- 238000006477 desulfuration reaction Methods 0.000 description 6
- 230000023556 desulfurization Effects 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001341 Crude steel Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 235000019795 sodium metasilicate Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は加工性に優れた薄板用鋼
材の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing thin plate steel materials with excellent workability.
【０００２】0002
【従来の技術と課題】近年、薄鋼板の品質に対する要求
が高まりそれに応じて、製造方法も発達し、その用途に
応じて、種々の品質特性が要求されているが、鉄以外の
有害成分ができるだけ少ない清浄鋼が望まれるようにな
っていた。[Prior Art and Issues] In recent years, demands for the quality of thin steel sheets have increased, and accordingly, manufacturing methods have also been developed, and various quality characteristics are required depending on the application. It became desirable to use as little clean steel as possible.
【０００３】例えば、Ｓ，Ｃ，Ｎは鋼材中に介在物とし
て析出して加工性を阻害する要因となるので、できるだ
け低いことが望ましい。また、絞り性改善の観点から、
Ｔｉ／Ｃを７以上とすることが必要とされている。Ｔｉ
はＣに優先してＮ，Ｓと容易に結合して窒化物または硫
化物をつくるので、その残余のＴｉがＴｉ／Ｃ＞７とす
ることにより有効に働くことになるので、この点からも
Ｓ，Ｃ，Ｎが少ない方が望ましい。従来の方法では、Ｒ
Ｈ脱ガス炉によって、Ｃ，Ｎは２０ｐｐｍ 以下のもの
が得られ、Ｐについては、５０ｐｐｍ 程度の清浄鋼が
得られている（特開昭６１−６４８１０）。For example, S, C, and N precipitate as inclusions in steel materials and become a factor that inhibits workability, so it is desirable that their content be as low as possible. In addition, from the perspective of improving drawing performance,
It is required that Ti/C be 7 or more. Ti
Since it easily combines with N and S over C to form nitrides or sulfides, the remaining Ti will work more effectively if Ti/C>7. It is desirable to have less S, C, and N. In the conventional method, R
Using an H degassing furnace, a clean steel with a C and N content of 20 ppm or less and a P content of about 50 ppm has been obtained (Japanese Patent Laid-Open No. 61-64810).
【０００４】しかしながら、Ｃ，Ｓ，Ｎを従来通りの低
いレベルに抑えた上に、Ｐをさらに低減して、薄板の加
工の際に必要とされる耐たて割れ性の向上を図ることが
製品の付加価値を高めるのに有効である。[0004] However, in addition to suppressing C, S, and N to the conventional low levels, it is possible to further reduce P to improve the warp cracking resistance required when processing thin plates. It is effective in increasing the added value of products.
【０００５】本発明はかかる事情に鑑みてなされたもの
で、鋼中のＣ，Ｓ，Ｎがそれぞれ２０ｐｐｍ 以下に低
減され、かつＰが２０ｐｐｍ 以下の清浄鋼を製造する
方法を提供しようとするものである。The present invention has been made in view of the above circumstances, and aims to provide a method for producing clean steel in which C, S, and N in steel are each reduced to 20 ppm or less, and P is 20 ppm or less. It is.
【０００６】[0006]
【課題を解決するための手段、作用】本発明による清浄
鋼の製造方法は、溶銑予備処理装置で脱硫および脱燐を
行った溶銑を用いて、転炉精錬により脱炭、脱燐を行っ
た後、溶鋼を取鍋に装入して取鍋精錬装置により未脱酸
加熱を行って除滓した後、真空脱ガス炉により脱炭、脱
窒を行う清浄鋼の製造方法であって、転炉に装入する溶
銑は、溶銑予備処理により燐成分を０．０１ｗｔ％ 以
下とし、転炉吹錬の終了時の溶鋼温度は１６５０℃以下
として、転炉吹錬終了後、取鍋に溶鋼を装入するとき、
５ 〜 １０ｋｇ／ｔ の転炉スラグを取鍋に流出させ
、さらに媒溶剤として焼石灰または軽焼ドロマイトを５
〜１０ｋｇ／ｔ を添加してアークプロセスによる取
鍋精錬を行うことを特徴とする。[Means and effects for solving the problem] The method for manufacturing clean steel according to the present invention uses hot metal that has been desulfurized and dephosphorized in a hot metal pretreatment device, and decarburizes and dephosphorsizes it by converter refining. After that, the molten steel is charged into a ladle, heated in a ladle refining device to remove slag, and then decarburized and denitrified in a vacuum degassing furnace. The molten pig iron charged into the furnace has a phosphorus content of 0.01 wt% or less through hot metal pretreatment, and the molten steel temperature at the end of converter blowing is 1650°C or less. When charging,
5 to 10 kg/t of converter slag is discharged into a ladle, and 5 to 10 kg/t of burnt lime or light dolomite is added as a solvent.
It is characterized by adding ~10 kg/t and performing ladle refining by an arc process.
【０００７】溶銑の段階で予備処理することによって後
工程の不純物低減の負担を軽くする。転炉精錬では上下
吹きの転炉により脱炭、脱燐を行う。転炉の脱燐能力を
高めるため、１６５０℃以下の温度で精錬を終了させる
。取鍋精錬炉は、取鍋を雰囲気調整可能な容器に入れて
アーク加熱を行う。このときの加熱は自然放冷による温
度低下の熱補償をするとともに脱燐のために添加する媒
溶剤の滓化に必要である。脱燐反応促進のためにはスラ
グ中の（ＦｅＯ），（ＭｎＯ） の濃度を確保するとと
もに、（Ｐ２Ｏ５）濃度を希釈する必要がある。このた
め、転炉スラグは ５〜１０ｋｇ／ｔｏｎ（メタルｔｏ
ｎ 当り、以下同じ） 、また媒溶剤として焼石灰また
は軽焼ドロマイトを ５〜１０ｋｇ／ｔｏｎ添加する。
取鍋精錬の後、復燐防止のため除滓して真空脱ガスを行
う。取鍋精錬で、未脱酸加熱を行うのは、真空脱ガス工
程で、脱炭反応に必要な酸素を確保するためである。[0007] Preliminary treatment at the stage of hot metal reduces the burden of reducing impurities in subsequent steps. In converter refining, decarburization and dephosphorization are performed using a top-down blowing converter. In order to increase the dephosphorization capacity of the converter, refining is completed at a temperature of 1650°C or lower. A ladle refining furnace performs arc heating by placing a ladle in a container whose atmosphere can be controlled. Heating at this time is necessary to compensate for the temperature drop due to natural cooling and to form a slag of the solvent added for dephosphorization. In order to promote the dephosphorization reaction, it is necessary to ensure the concentrations of (FeO) and (MnO) in the slag and to dilute the (P2O5) concentration. For this reason, the converter slag is 5 to 10 kg/ton (metal to
(the same applies hereinafter), and 5 to 10 kg/ton of burnt lime or lightly burnt dolomite is added as a solvent. After ladle refining, slag is removed and vacuum degassed to prevent rephosphorization. The reason why non-deoxidizing heating is performed in ladle refining is to secure the oxygen necessary for the decarburization reaction in the vacuum degassing process.
【０００８】[0008]
【実施例】添付の図面を参照しながら本発明の実施例に
ついて詳細に説明する。図１は、本発明の方法を実施す
る工程のブロック図である。高炉１１で出銑された溶銑
は溶銑予備処理される。先ず、溶銑脱硫装置１２で脱硫
され、ついで溶銑脱燐装置１３により脱燐された後、転
炉１４に装入される。脱硫方式は溶銑鍋に脱硫剤を装入
してインペラーを回転して攪拌するものである。脱硫の
処理時間は約１５分である。脱硫の後、溶銑鍋は台車に
より溶銑脱燐装置１３に移動される。DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram of the steps for carrying out the method of the invention. Hot metal tapped in the blast furnace 11 is pretreated. First, it is desulfurized in a hot metal desulfurization device 12, then dephosphorized in a hot metal dephosphorization device 13, and then charged into a converter 14. In the desulfurization method, a desulfurization agent is charged into a hot metal ladle and agitated by rotating an impeller. The desulfurization treatment time is about 15 minutes. After desulfurization, the hot metal ladle is moved to the hot metal dephosphorization device 13 by a trolley.
【０００９】溶銑脱燐装置には集塵用のフード、溶銑を
攪拌するＮ２ガス吹き込み用ランス、脱燐の媒溶剤の装
入装置および酸素吹き込みランスが備えられている。脱
燐の媒溶剤としては石灰、ホタル石、焼結粉、ソーダ灰
を使用している。脱燐の処理時間は約３０分で、溶銑温
度は処理前で１２００〜１４００℃、処理後で１３００
〜１３２０℃としている。The hot metal dephosphorization equipment is equipped with a hood for dust collection, a lance for blowing N2 gas to stir the hot metal, a charging device for a dephosphorizing solvent, and a lance for blowing oxygen. Lime, fluorspar, sintered powder, and soda ash are used as solvents for dephosphorization. The dephosphorization treatment time is approximately 30 minutes, and the hot metal temperature is 1200-1400℃ before treatment and 1300℃ after treatment.
~1320°C.
【００１０】溶銑の予備処理が行われているので、転炉
１４では上吹き酸素ランスからの酸素吹き込みにより主
に脱炭および脱燐が行われる。転炉１４での精錬が終了
した後の溶鋼は取鍋に出鋼されるが、このとき５ 〜１
０ｋｇ／ｔの転炉スラグを取鍋内に流出させる。この後
、取鍋は取鍋精錬装置１５に移動される。取鍋精錬装置
には取鍋を収容する容器、容器内の雰囲気を調整して不
活性雰囲気とする雰囲気調整装置および取鍋内の溶鋼の
温度補償を行い脱燐用の媒溶剤を溶解するためのアーク
加熱装置が備えられている。Since the hot metal is pre-treated, decarburization and dephosphorization are mainly performed in the converter 14 by blowing oxygen from the top-blowing oxygen lance. Molten steel after finishing refining in the converter 14 is tapped into a ladle, but at this time 5 to 1
Converter slag of 0 kg/t is discharged into the ladle. After this, the ladle is moved to the ladle refining device 15. The ladle refining equipment includes a container to house the ladle, an atmosphere adjustment device to adjust the atmosphere inside the container to create an inert atmosphere, and a device to compensate for the temperature of the molten steel in the ladle and dissolve the solvent for dephosphorization. It is equipped with an arc heating device.
【００１１】前記媒溶剤として、転炉スラグの他、アー
ク加熱の前に焼石灰および軽焼ドロマイト（ＣａＯ／Ｓ
ｉＯ２）を５〜１０ｋｇ／ｔ 添加する。上記のように
転炉スラグを用いることにより、脱燐用の高価なフラッ
クス、たとえば、メタ珪酸ソーダ等を使う必要はなくな
る。こうして、スラグ塩基度（ ＣａＯ／ＳｉＯ２）が
上昇し、スラグ中のＰ濃度が希釈され、脱燐が促進され
る。取鍋精錬の後、ＲＨ真空脱ガス装置１６により脱炭
、脱窒が行われる。取鍋精錬で未脱酸加熱を行なってい
るので、熱補償は充分でかつ溶鋼中に脱炭に必要な酸素
量が確保されており、特に脱ガス工程で酸素吹き込みを
行う必要はない。[0011] In addition to converter slag, burnt lime and light burnt dolomite (CaO/S) are used as the solvent before arc heating.
iO2) at a rate of 5 to 10 kg/t. By using converter slag as described above, there is no need to use expensive flux for dephosphorization, such as sodium metasilicate. In this way, the slag basicity (CaO/SiO2) increases, the P concentration in the slag is diluted, and dephosphorization is promoted. After ladle refining, decarburization and denitrification are performed by the RH vacuum degasser 16. Since non-deoxidized heating is performed during ladle refining, heat compensation is sufficient and the amount of oxygen necessary for decarburization is ensured in the molten steel, so there is no need to blow oxygen in the degassing process.
【００１２】表１は４回のヒート、１〜４について、転
炉吹錬および取鍋精錬の終了時（表中、それぞれＡ，Ｂ
で示す）のスラグ成分、溶鋼中の燐成分 Ｐ 、スラグ
と溶鋼の燐成分の比、（Ｐ）／ Ｐ および溶鋼の温度
を示したものである。ヒート１、２は比較例で、ヒート
３、４が本実施例である。この表のスラグ成分から、上
記の転炉スラグ、軽焼ドロマイトの装入により塩基度が
上昇していることが示されている。なお、表１は溶銑予
備処理により溶銑中の燐Ｐ は０．０１ｗｔ％ 程度ま
で下げて操業したものについて示してある。Table 1 shows four heats, 1 to 4, at the end of converter blowing and ladle refining (A and B, respectively, in the table).
The figure shows the slag component (shown by ), the phosphorus component P in the molten steel, the ratio of the phosphorus component between the slag and the molten steel, (P)/P, and the temperature of the molten steel. Heats 1 and 2 are comparative examples, and heats 3 and 4 are examples. The slag components in this table show that the basicity is increased by charging the above-mentioned converter slag and light calcined dolomite. Table 1 shows the results of operations in which the phosphorus P content in the hot metal was reduced to about 0.01 wt% through hot metal pretreatment.
【００１３】[0013]
【表１】[Table 1]
【００１４】表２〜表５は、表１のヒート、１〜４にそ
れぞれ対応したメタル中のＣ，Ｓｉ，Ｐ，Ｓ、Ｎの成分
について、工程毎の変化を示したものである。単位はい
ずれも重量比で、ｗｔ％ または表中に記入したｐｐｍ
である。ヒート１、２は上記の脱燐処理をした溶銑を５
０％，ヒート３，４は１００％使用した結果である。ま
た、表中、Ａは溶銑予備処理後、転炉に装入された溶銑
、Ｂは転炉吹錬終了後、Ｃは取鍋精錬終了後の溶鋼、Ｄ
はＲＨ脱ガス炉による脱ガス処理終了後の溶鋼、Ｅは凝
固後の粗鋼、についてそれぞれメタル成分を示してある
。表中、操業条件は転炉および取鍋精錬について示して
ある。この中で、ａ０ は転炉精錬終了後、酸素プロー
ブで測定した酸素濃度である。Tables 2 to 5 show changes in the C, Si, P, S, and N components in the metals corresponding to heats 1 to 4 in Table 1, respectively, for each process. All units are weight ratios, wt% or ppm as indicated in the table.
It is. In heats 1 and 2, the hot metal that has undergone the above dephosphorization treatment is
0%, heats 3 and 4 are the results of using 100%. In addition, in the table, A is the hot metal charged into the converter after the hot metal pretreatment, B is the hot metal after the converter blowing, C is the hot metal after the ladle refining, and D is the hot metal after the ladle refining.
The metal components are shown for the molten steel after degassing in the RH degassing furnace, and for the crude steel after solidification. In the table, operating conditions are shown for converter and ladle refining. In this, a0 is the oxygen concentration measured with an oxygen probe after the converter refining is completed.
【００１５】表４、５に示されているように本実施例に
よれば、溶銑予備処理を行なった溶銑を１００％使用す
ることにより Ｐ が２０ｐｐｍ 以下である清浄鋼
を得ることができる。[0015] As shown in Tables 4 and 5, according to this example, clean steel having a P content of 20 ppm or less can be obtained by using 100% of hot metal that has undergone hot metal pretreatment.
【００１６】[0016]
【表２】[Table 2]
【００１７】[0017]
【表３】[Table 3]
【００１８】[0018]
【表４】[Table 4]
【００１９】[0019]
【表５】[Table 5]
【００２０】[0020]
【発明の効果】本発明の方法によれば、予備処理した溶
銑を転炉精錬し、取鍋精錬で未脱酸加熱で脱燐した後、
脱ガス処理を行うので、鋼中のＣ，Ｓ，Ｎがそれぞれ２
０ｐｐｍ 以下に低減され、かつＰが２０ｐｐｍ 以下
の清浄鋼が得られる。[Effects of the Invention] According to the method of the present invention, pretreated hot metal is refined in a converter, and after being dephosphorized by heating without deoxidizing in a ladle refining,
Since degassing treatment is performed, C, S, and N in the steel are each reduced to 2
A clean steel in which P is reduced to 0 ppm or less and P is 20 ppm or less can be obtained.
【図１】本実施例の工程を示すブロック図である。FIG. 1 is a block diagram showing the steps of this embodiment.
１１ 高炉 １２ 溶銑脱硫装置 １３ 溶銑脱燐装置 １４ 転炉 １５ 取鍋精錬装置 １６ 真空脱ガス装置 11 Blast furnace 12 Hot metal desulfurization equipment 13 Hot metal dephosphorization equipment 14 Converter 15 Ladle refining equipment 16 Vacuum degassing equipment
Claims (1)
行った溶銑を用いて、転炉精錬により脱炭、脱燐を行っ
た後、溶鋼を取鍋に装入して取鍋精錬装置により未脱酸
加熱を行って除滓した後、真空脱ガス炉により脱炭、脱
窒を行う清浄鋼の製造方法であって、転炉に装入する溶
銑は、溶銑予備処理により燐成分を０．０１ｗｔ％ 以
下とし、転炉吹錬の終了時の溶鋼温度は１６５０℃以下
として、転炉吹錬終了後、取鍋に溶鋼を装入するとき、
５ 〜 １０ｋｇ／ｔの転炉スラグを取鍋に流出させ、
さらに媒溶剤として焼石灰または軽焼ドロマイトを５
〜 １０ｋｇ／ｔ を添加してアークプロセスによる取
鍋精錬を行うことを特徴とする清浄鋼の製造方法。Claim 1: Using the hot metal that has been desulfurized and dephosphorized in the hot metal pretreatment equipment, decarburization and dephosphorization are performed by converter refining, and then the molten metal is charged into a ladle and processed by the ladle refining equipment. A method for producing clean steel in which sludge is removed by non-deoxidized heating, and then decarburized and denitrified in a vacuum degassing furnace, in which the hot metal charged to the converter is pretreated to remove phosphorus from the hot metal. .01wt% or less, and the molten steel temperature at the end of converter blowing is 1650 ° C. or less, and when charging molten steel into the ladle after converter blowing is completed,
5 to 10 kg/t of converter slag flows into a ladle,
Furthermore, burnt lime or lightly burnt dolomite is added as a solvent.
A method for producing clean steel, characterized in that ladle refining is performed by an arc process with the addition of ~10 kg/t.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3026404A JPH04268012A (en) | 1991-02-20 | 1991-02-20 | Production of clean steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3026404A JPH04268012A (en) | 1991-02-20 | 1991-02-20 | Production of clean steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04268012A true JPH04268012A (en) | 1992-09-24 |
Family
ID=12192618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3026404A Pending JPH04268012A (en) | 1991-02-20 | 1991-02-20 | Production of clean steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04268012A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007332398A (en) * | 2006-06-12 | 2007-12-27 | Kobe Steel Ltd | Method for producing high cleanliness steel |
| KR100885117B1 (en) * | 2002-11-14 | 2009-02-20 | 주식회사 포스코 | A method for manufacturing of low carbon steel having high cleaness and low phosphorous |
| JP2010013674A (en) * | 2008-07-01 | 2010-01-21 | Kobe Steel Ltd | Refining method using electric furnace |
| JP2011214023A (en) * | 2010-03-31 | 2011-10-27 | Jfe Steel Corp | Dephosphorization method for hot metal |
-
1991
- 1991-02-20 JP JP3026404A patent/JPH04268012A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100885117B1 (en) * | 2002-11-14 | 2009-02-20 | 주식회사 포스코 | A method for manufacturing of low carbon steel having high cleaness and low phosphorous |
| JP2007332398A (en) * | 2006-06-12 | 2007-12-27 | Kobe Steel Ltd | Method for producing high cleanliness steel |
| JP2010013674A (en) * | 2008-07-01 | 2010-01-21 | Kobe Steel Ltd | Refining method using electric furnace |
| JP2011214023A (en) * | 2010-03-31 | 2011-10-27 | Jfe Steel Corp | Dephosphorization method for hot metal |
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