JPH04262840A - Method for continuously casting molten metal - Google Patents
Method for continuously casting molten metalInfo
- Publication number
- JPH04262840A JPH04262840A JP4413491A JP4413491A JPH04262840A JP H04262840 A JPH04262840 A JP H04262840A JP 4413491 A JP4413491 A JP 4413491A JP 4413491 A JP4413491 A JP 4413491A JP H04262840 A JPH04262840 A JP H04262840A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- mold
- powder
- fluorinated carbon
- thermal decomposition
- 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
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 80
- 239000002184 metal Substances 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims description 13
- 238000005266 casting Methods 0.000 title description 4
- 239000007789 gas Substances 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 23
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 10
- 239000001257 hydrogen Substances 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- 238000005979 thermal decomposition reaction Methods 0.000 claims abstract description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000009749 continuous casting Methods 0.000 claims description 10
- 239000012159 carrier gas Substances 0.000 claims description 7
- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical compound C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 claims description 6
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052731 fluorine Inorganic materials 0.000 abstract description 6
- 239000011737 fluorine Substances 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 150000004767 nitrides Chemical class 0.000 abstract description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 abstract 1
- 230000002250 progressing effect Effects 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 14
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 7
- 238000007654 immersion Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 6
- 239000001569 carbon dioxide Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 150000002431 hydrogen Chemical class 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 241000120551 Heliconiinae Species 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 241000519995 Stachys sylvatica Species 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 150000002222 fluorine compounds Chemical class 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229920002493 poly(chlorotrifluoroethylene) Polymers 0.000 description 1
- 239000005023 polychlorotrifluoroethylene (PCTFE) polymer Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、表面性状に優れ且つ
内部欠陥のない品質の優れた鋳片を、連続的に鋳造する
ための、溶融金属の連続鋳造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a continuous casting method for molten metal for continuously casting slabs of high quality with excellent surface properties and no internal defects.
【０００２】0002
【従来の技術】鋼、銅、アルミニウム等の、鉄または非
鉄溶融金属を、連続鋳造機によって連続鋳造するに際し
、鋳型内における溶融金属表面の酸化防止および溶融金
属の保温、鋳型と鋳片との間の潤滑、溶融金属の表面に
浮上した介在物の捕捉等のために、鋳型内の溶融金属の
表面上に、モールドパウダーを添加することが行われて
いる。[Prior Art] When continuously casting ferrous or non-ferrous molten metal such as steel, copper, aluminum, etc. using a continuous casting machine, it is necessary to prevent oxidation of the molten metal surface in the mold, keep the molten metal warm, and maintain the relationship between the mold and slab. Mold powder is added to the surface of the molten metal in the mold for lubrication between molds and to capture inclusions floating on the surface of the molten metal.
【０００３】鋳型内の溶融金属の表面上に添加されたモ
ールドパウダーは、溶融金属の熱により溶融し、一定の
粘性を有する溶融ガラス状になって、溶融金属の表面上
を被覆すると共に、凝固シェルの側面と鋳型内面との隙
間に浸透する。従って、鋳型内の溶融金属は、空気から
遮断されるので、酸化および熱放散から防がれる。更に
、溶融モールドパウダーの層は、溶融金属の表面上に浮
上した非金属介在物やスカムを捕捉しこれらを除去する
。また、凝固シェルの側面と鋳型内面との隙間に浸透し
た溶融モールドパウダーによって、鋳型と鋳片との間が
潤滑になり、鋳型から鋳片を円滑に連続的に引き抜くこ
とができる。上述したモールドパウダーとして、従来、
主として、ＣａＯ，ＳｉＯ２， Ａｌ２Ｏ３，Ｎａ２Ｏ
等の成分からなるものが使用されている。[0003] The mold powder added to the surface of the molten metal in the mold is melted by the heat of the molten metal, becomes a molten glass having a certain viscosity, coats the surface of the molten metal, and solidifies. It penetrates into the gap between the side of the shell and the inner surface of the mold. The molten metal within the mold is therefore shielded from air and thus prevented from oxidizing and heat dissipation. Further, the layer of molten mold powder captures and removes non-metallic inclusions and scum floating on the surface of the molten metal. Further, the molten mold powder that has penetrated into the gap between the side surface of the solidified shell and the inner surface of the mold provides lubrication between the mold and the slab, allowing the slab to be smoothly and continuously pulled out from the mold. Conventionally, as the mold powder mentioned above,
Mainly CaO, SiO2, Al2O3, Na2O
A product consisting of the following ingredients is used.
【０００４】0004
【発明が解決しようとする課題】しかしながら、従来の
モールドパウダーを使用した連続鋳造には、次に述べる
ような問題がある。即ち、連続鋳造すべき溶融金属中に
は、水素、酸素および酸化物等が含有されている。溶融
金属中の水素、酸素および酸化物等は、溶融金属の精錬
時において、空気、精錬炉の炉壁耐火物、原料、造滓剤
、添加剤等に含有されている水分によって、溶融金属中
に侵入する。従来のモールドパウダーによっては、上述
した、溶融金属中の水素、酸素および酸化物等を除去す
ることはできない。この結果、凝固した鋳片中に、気孔
、割れ疵、および、あばた状の銀点、白点等の欠陥が発
生し、鋳片の表面性状および品質が劣化する。更に、従
来のモールドパウダーによっては、溶融金属の表面上の
被覆、および、溶融金属の流動性の向上が不十分であり
、溶融金属の温度低下および酸化を適確に防止すること
ができない。However, continuous casting using conventional molding powder has the following problems. That is, the molten metal to be continuously cast contains hydrogen, oxygen, oxides, and the like. Hydrogen, oxygen, oxides, etc. in the molten metal are removed by moisture contained in the air, the refractory wall of the smelting furnace, raw materials, slag forming agents, additives, etc. during molten metal refining. to invade. Conventional molding powders cannot remove hydrogen, oxygen, oxides, etc. in the molten metal as described above. As a result, defects such as pores, cracks, pock-like silver spots, and white spots occur in the solidified slab, and the surface properties and quality of the slab deteriorate. Further, depending on the conventional molding powder, the coating on the surface of the molten metal and the improvement of the fluidity of the molten metal are insufficient, and it is not possible to appropriately prevent the temperature drop and oxidation of the molten metal.
【０００５】従って、この発明の目的は、上述した問題
を解決し、溶融金属中の水素、酸素および酸化物等を除
去し、且つ、溶融金属の温度低下を防止し、そして、そ
の流動性を向上させ、表面性状に優れ且つ内部欠陥の少
ない、品質の優れた鋳片を、連続的に鋳造するための方
法を提供することにある。Therefore, an object of the present invention is to solve the above-mentioned problems, remove hydrogen, oxygen, oxides, etc. from molten metal, prevent the temperature of molten metal from decreasing, and improve its fluidity. The object of the present invention is to provide a method for continuously casting slabs of excellent quality, with improved surface properties and fewer internal defects.
【０００６】[0006]
【課題を解決するための手段〕本発明者等
は、上述した問題を解決すべく鋭意研究を重ねた。その
結果、弗化カーボン粉末または弗化カーボンを含有する
粉末を、鋳型内の溶融金属中に添加すれば、その熱分解
によって発生したガスによる、脱水素作用、酸化防止作
用、流動性向上作用、被覆作用等によって、表面性状に
優れ且つ内部欠陥のない、品質の優れた鋳片を、連続的
に鋳造することができることを知見した。
【０００７】この発明は、上記知見に基づいてなされた
ものであって、この発明の方法は、溶融金属を鋳型内に
注入して鋳片を形成し、形成された鋳片を鋳型内から連
続的に引き抜く、溶融金属の連続鋳造法において、弗化
カーボン粉末または弗化カーボンを含有する粉末を、前
記鋳型内の前記溶融金属の表面上または前記溶融金属中
に添加して、その熱分解により発生したガスにより、溶
融金属中の水素および酸素を除去し、且つ、溶融金属の
流動性を向上させることに特徴を有するものである。[Means for Solving the Problems] The present inventors have conducted extensive research in order to solve the above-mentioned problems. As a result, if fluorinated carbon powder or powder containing fluorinated carbon is added to the molten metal in the mold, the gas generated by its thermal decomposition will have a dehydrogenating effect, an antioxidant effect, and a fluidity-improving effect. It has been discovered that, by coating and the like, it is possible to continuously cast slabs of excellent quality with excellent surface properties and no internal defects. The present invention has been made based on the above findings, and the method of the present invention involves injecting molten metal into a mold to form a slab, and continuously discharging the formed slab from within the mold. In a continuous casting method of molten metal, in which a fluorinated carbon powder or a powder containing fluorinated carbon is added onto the surface of the molten metal in the mold or into the molten metal, and by its thermal decomposition, It is characterized in that the generated gas removes hydrogen and oxygen from the molten metal and improves the fluidity of the molten metal.
【０００８】[0008]
【作用】この発明において、鋳型内の溶融金属中に添加
する弗化カーボンは、（Ｃ２Ｆ４）ｎ を主成分とする
特殊樹脂からなるポリマーである。弗化カーボンポリマ
ーは、約４００ ℃の温度によって熱分解し、弗化カー
ボンモノマーとなり、更に、約６５０ ℃以上の温度に
よって、２酸化炭素（ＣＯ２） および４弗化炭素（Ｃ
Ｆ４）を主成分とするガスになる。[Operation] In this invention, the carbon fluoride added to the molten metal in the mold is a polymer made of a special resin containing (C2F4)n as its main component. Fluorinated carbon polymers thermally decompose into fluorinated carbon monomers at temperatures of about 400°C, and further decompose into carbon dioxide (CO2) and carbon tetrafluoride (C) at temperatures of about 650°C or higher.
It becomes a gas whose main component is F4).
【０００９】鋳型内に注入された溶融金属の温度は約１
５００℃である。従って、溶融金属中に添加された弗化
カーボン粉末は、溶融金属の有する高温度の伝導熱によ
り直ちに熱分解して、２酸化炭素（ＣＯ２） および４
弗化炭素（ＣＦ４）を主成分とする強還元性のガスにな
り、そして、更に熱分解が進むと、２酸化炭素（ＣＯ２
） 、４弗化炭素（ＣＦ４）および弗化水素（ＨＦ）を
主成分とする強還元性のガスになる。The temperature of the molten metal poured into the mold is approximately 1
The temperature is 500°C. Therefore, the carbon fluoride powder added to the molten metal is immediately thermally decomposed by the high temperature conduction heat of the molten metal, producing carbon dioxide (CO2) and 4
It becomes a strongly reducing gas whose main component is carbon fluoride (CF4), and as the thermal decomposition progresses further, it becomes carbon dioxide (CO2).
), becomes a strongly reducing gas whose main components are carbon tetrafluoride (CF4) and hydrogen fluoride (HF).
【００１０】上記弗化カーボンの熱分解により生じた強
還元性のガスにより、鋳型内の溶融金属の表面は覆われ
て空気から遮断され、溶融金属と空気との界面に酸化防
止膜が形成される。この結果、空気との接触による、溶
融金属中の窒化物の生成が抑制される。[0010] The surface of the molten metal in the mold is covered with the strongly reducing gas generated by the thermal decomposition of the carbon fluoride, and is shielded from the air, forming an anti-oxidation film at the interface between the molten metal and the air. Ru. As a result, the formation of nitrides in the molten metal due to contact with air is suppressed.
【００１１】上記熱分解により発生した強還元性のガス
中の炭素および弗素と、溶融金属とが激しく反応して、
溶融金属中に含有されている酸素および水素が除去され
る。更に、溶融金属の凝固表面層に析出する金属酸化物
や難溶性の非金属介在物は、弗素との置換反応によって
弗化物となり、溶融金属中から除去される。[0011] Carbon and fluorine in the strongly reducing gas generated by the above thermal decomposition react violently with the molten metal.
Oxygen and hydrogen contained in the molten metal are removed. Furthermore, metal oxides and poorly soluble nonmetallic inclusions deposited on the solidified surface layer of the molten metal become fluorides through a substitution reaction with fluorine, and are removed from the molten metal.
【００１２】溶融金属中に添加された弗化カーボン粉末
は、沸騰状態の発熱反応（１２００Ｋｃａｌ／ｇ） を
起こして分解し、この発熱反応によって、鋳型内の溶融
金属のメニスカスの温度低下が防止される。従って、溶
融金属の流動性は向上し、鋳型内における溶融金属の流
れが円滑になる。[0012] The carbon fluoride powder added to the molten metal causes an exothermic reaction (1200 Kcal/g) in a boiling state and decomposes, and this exothermic reaction prevents the temperature of the meniscus of the molten metal in the mold from decreasing. Ru. Therefore, the fluidity of the molten metal is improved, and the molten metal flows smoothly within the mold.
【００１３】弗化カーボン粉末としては、６０〜３５０
メッシュの粒度の４弗化エチレン樹脂粉末を使用する
。４弗化エチレン樹脂は、弗素を含むオレフィンの重合
によって得られる合成樹脂である。このような合成樹脂
として、テトラフルオルエチレンから、主として乳化重
合によって得られるポリテトラフルオルエチレン（ＣＦ
２ＣＦ２）ｎ 、または、弗素（Ｆ）を部分的に塩素（
Ｃｌ） に置換したポリクロルトリフルオルエチレン（
ＣＦ２ＣＦＣｌ）ｎ などがある。弗化カーボン粉末と
しては、このような熱分解により有効的に弗素ガスを生
成するフルオロカーボンポリマーの粉末が使用される。[0013] As the fluorinated carbon powder, 60 to 350
Tetrafluoroethylene resin powder with mesh particle size is used. Tetrafluoroethylene resin is a synthetic resin obtained by polymerizing olefin containing fluorine. Such synthetic resins include polytetrafluoroethylene (CF), which is obtained mainly from tetrafluoroethylene by emulsion polymerization.
2CF2)n, or partially convert fluorine (F) into chlorine (
Polychlorotrifluoroethylene (Cl) substituted with
CF2CFCl)n etc. As the fluorinated carbon powder, a fluorocarbon polymer powder that effectively generates fluorine gas through such thermal decomposition is used.
【００１４】弗化カーボン粉末としては、上述したよう
に６０〜３５０ メッシュの粒度のものを使用すること
が好ましい。弗化カーボン粉末の粒度が３５０ メッシ
ュを超えると、溶融金属中における分散効率が低下する
。一方、弗化カーボン粉末の粒度が６０メッシュ未満の
ものは、工業的な製造が困難である。As mentioned above, it is preferable to use fluorinated carbon powder having a particle size of 60 to 350 mesh. When the particle size of the fluorinated carbon powder exceeds 350 mesh, the dispersion efficiency in the molten metal decreases. On the other hand, fluorinated carbon powder having a particle size of less than 60 mesh is difficult to manufacture industrially.
【００１５】弗化カーボン粉末は、鋳型内の溶融金属中
に単体として添加しても、または、従来のモールドパウ
ダーと混合して添加してもよい。溶融金属中への弗化カ
ーボン粉末の添加は、例えば、タンディッシュに取りつ
けられたノズルまたはストッパを介して、鋳型内の溶融
金属の表面上または溶融金属中に、その凝固が始まる直
前に供給する。The fluorinated carbon powder may be added alone to the molten metal in the mold or mixed with conventional molding powder. The addition of fluorinated carbon powder into the molten metal can be carried out, for example via a nozzle or stopper mounted on a tundish, onto the surface of the molten metal in the mold or into the molten metal just before its solidification begins. .
【００１６】図１は、弗化カーボン粉末の供給装置の一
例を示す概略縦断面図である。図１に示すように、タン
ディッシュ１の底部１ａの排出口に設けられたスライデ
ィングゲート２に、浸漬ノズル３の上端が取り付けられ
ている。浸漬ノズル３の下部は、連続鋳造機の鋳型４内
の溶鋼中に浸漬されている。浸漬ノズル３の途中には、
その内孔３ａに連通するガス吹き込み孔３ｂが設けられ
ている。ガス吹き込み孔３ｂには導管５の一端が接続さ
れており、導管５の他端は、キャリアガスとしてのアル
ゴンガスの容器６に接続されている。導管５の途中には
、弗化カーボン粉末を収容する容器７の排出口がバルブ
８を介して接続されている。弗化カーボン粉末を収容す
る容器７の上部には、ガス容器６からの支管９が接続さ
れており、支管９を通って、ガス容器６内のアルゴンガ
スが容器７の上部に供給され、容器７内の弗化カーボン
粉末を加圧している。１０は導管５および支管９の途中
に設けられた圧力ゲージ、１１は支管９の途中に設けら
れたバルブである。FIG. 1 is a schematic longitudinal sectional view showing an example of a fluorinated carbon powder supply device. As shown in FIG. 1, the upper end of the immersion nozzle 3 is attached to a sliding gate 2 provided at the outlet of the bottom 1a of the tundish 1. The lower part of the immersion nozzle 3 is immersed in molten steel in a mold 4 of a continuous casting machine. In the middle of the immersion nozzle 3,
A gas blowing hole 3b communicating with the inner hole 3a is provided. One end of a conduit 5 is connected to the gas blowing hole 3b, and the other end of the conduit 5 is connected to a container 6 for argon gas as a carrier gas. An outlet of a container 7 containing fluorinated carbon powder is connected to the middle of the conduit 5 via a valve 8. A branch pipe 9 from the gas container 6 is connected to the upper part of the container 7 containing the carbon fluoride powder, and through the branch pipe 9, the argon gas in the gas container 6 is supplied to the upper part of the container 7. The fluorinated carbon powder in 7 is pressurized. 10 is a pressure gauge provided in the middle of the conduit 5 and the branch pipe 9, and 11 is a valve provided in the middle of the branch pipe 9.
【００１７】タンディッシュ１内の溶融金属は、スライ
ディングゲート２に取り付けられた浸漬ノズル３の内孔
３ａを通り、その下部の吐出口３ｃから、鋳型４内に鋳
込まれる。このとき、容器７内の弗化カーボン粉末は、
導管５を通り、ガス容器６内のアルゴンガスをキャリア
ガスとして、浸漬ノズル３の内孔３ａ内を流下する溶融
金属中に添加され、その吐出口３ｃから鋳型４内に供給
される。The molten metal in the tundish 1 passes through the inner hole 3a of the submerged nozzle 3 attached to the sliding gate 2, and is cast into the mold 4 from the discharge port 3c at the bottom thereof. At this time, the fluorinated carbon powder in the container 7 is
The argon gas in the gas container 6 is used as a carrier gas to be added to the molten metal flowing down the inner hole 3a of the submerged nozzle 3 through the conduit 5, and is supplied into the mold 4 from the discharge port 3c.
【００１８】図２は、弗化カーボン粉末の供給装置の他
の例を示す概略縦断面図である。図２に示すように、タ
ンディッシュ１の底部１ａに設けられた排出口１ｂには
、浸漬ノズル３が取り付けられ、排出口１ｂには、スト
ッパ１２が上下動可能に取り付けられている。ストッパ
１２の上部には、導管５が接続されており、導管５には
上述したキャリアガスとしてのアルゴンガスの容器６、
および、弗化カーボン粉末を収容する容器７が接続され
ている。ストッパ１２の下部には、ポーラスプラグ１３
が取り付けられている。FIG. 2 is a schematic longitudinal sectional view showing another example of a fluorinated carbon powder supply device. As shown in FIG. 2, a submerged nozzle 3 is attached to an outlet 1b provided at the bottom 1a of the tundish 1, and a stopper 12 is attached to the outlet 1b so as to be movable up and down. A conduit 5 is connected to the upper part of the stopper 12, and the conduit 5 contains a container 6 for argon gas as a carrier gas,
A container 7 containing fluorinated carbon powder is connected thereto. A porous plug 13 is provided at the bottom of the stopper 12.
is installed.
【００１９】タンディッシュ１内の溶融金属は、浸漬ノ
ズル３の内孔３ａを通り、その下部の吐出口３ｃから、
鋳型４内に鋳込まれる。このとき、容器７内の弗化カー
ボン粉末は、導管５を通り、ガス容器６内のアルゴンガ
スをキャリアガスとして、ストッパ１２の上部に供給さ
れ、ストッパ１２の内孔１２ａおよびポーラスプラグ１
３を通り、浸漬ノズル３の内孔３ａ 内を流下する溶融
金属中に添加され、その吐出口３ｃから鋳型４内に供給
される。The molten metal in the tundish 1 passes through the inner hole 3a of the immersion nozzle 3, and is discharged from the lower discharge port 3c.
It is cast into a mold 4. At this time, the fluorinated carbon powder in the container 7 passes through the conduit 5 and is supplied to the upper part of the stopper 12 using the argon gas in the gas container 6 as a carrier gas, and is supplied to the inner hole 12a of the stopper 12 and the porous plug 1.
3, is added to the molten metal flowing down inside the inner hole 3a of the immersion nozzle 3, and is supplied into the mold 4 from the discharge port 3c.
【００２０】[0020]
【実施例】次に、この発明の方法を、実施例により更に
説明する。図１に示した装置を使用し、アルゴンガスを
キャリアガスとして、浸漬ノズル３内を流下する溶鋼中
に、下記条件により弗化カーボン粉末を添加し、鋳型４
内にこれを供給した。
■ 鋼種 ：ＳＵＳ３０４、■ 添
加物 ：弗化カーボン粉末１００％、 粒
度 ５〜４０μｍ、
■ キャリアガス：アルゴンガス、
■ 添加量 ：溶鋼１Ｔ当たり、２０〜３
０ｇ上述のようにして、鋳型内の溶鋼中に弗化カーボン
粉末を添加しながら連続鋳造を行ったところ、鋳造され
たスラブの無傷取り率は、７０〜８０％であった。これ
に対し、鋳型内の溶鋼中に弗化カーボン粉末を添加せず
に連続鋳造を行った場合の、スラブの無傷取り率は、５
０〜６０％であった。このように、本発明によれば、ス
ラブ表面に生ずる傷が大幅に減少し、スラブの無傷取り
率が顕著に向上した。EXAMPLES Next, the method of the present invention will be further explained by examples. Using the apparatus shown in Fig. 1 and using argon gas as a carrier gas, fluorinated carbon powder was added to the molten steel flowing down inside the immersion nozzle 3 under the following conditions, and the mold 4
This was provided within. ■ Steel type: SUS304, ■ Additives: 100% fluorinated carbon powder, particle size 5-40μm, ■ Carrier gas: Argon gas, ■ Addition amount: 20-3 per 1T of molten steel.
When continuous casting was performed while adding carbon fluoride powder to the molten steel in the mold as described above, the intactness rate of the cast slab was 70 to 80%. On the other hand, when continuous casting is performed without adding carbon fluoride powder to the molten steel in the mold, the slab intactness rate is 5.
It was 0-60%. As described above, according to the present invention, the number of scratches occurring on the surface of the slab was significantly reduced, and the rate of intactness of the slab was significantly improved.
【００２１】この発明の方法は、鋼、銅、アルミニウム
等、各種の鉄または非鉄溶融金属の連続鋳造に適用し、
優れた効果が発揮される。The method of the present invention is applicable to continuous casting of various ferrous or non-ferrous molten metals such as steel, copper, aluminum, etc.
Excellent effects are demonstrated.
【００２２】[0022]
【発明の効果】以上述べたように、この発明によれば、
溶融金属の精錬時において、空気、精錬炉の炉壁耐火物
、原料、造滓剤、添加剤等に含有されている水分によっ
て、溶融金属中に侵入した水素、酸素および酸化物等が
、適確に除去される。従って、凝固した鋳片中に、気孔
、割れ疵、および、あばた状の銀点、白点等の欠陥が発
生することはなく、表面性状および品質の優れた鋳片が
得られる。更に、溶融金属の表面上の被覆、および、溶
融金属の流動性の向上が十分に行われる結果、溶融金属
の温度低下および酸化を適確に防止することができる。
このように、この発明によれば、表面性状に優れ且つ内
部欠陥の少ない、品質の優れた鋳片を、連続的に鋳造す
ることができる、工業上有用な効果がもたらされる。[Effects of the Invention] As described above, according to the present invention,
During the refining of molten metal, hydrogen, oxygen, oxides, etc. that have entered the molten metal are properly removed by moisture contained in the air, the refractory wall of the smelting furnace, raw materials, slag forming agents, additives, etc. definitely removed. Therefore, defects such as pores, cracks, pock-shaped silver spots, and white spots do not occur in the solidified slab, and a slab with excellent surface texture and quality can be obtained. Further, since the surface of the molten metal is sufficiently coated and the fluidity of the molten metal is sufficiently improved, the temperature drop and oxidation of the molten metal can be appropriately prevented. As described above, the present invention brings about the industrially useful effect of being able to continuously cast slabs of excellent quality with excellent surface properties and few internal defects.
【図１】この発明の方法を実施するための装置の一例を
示す概略縦断面図である。FIG. 1 is a schematic longitudinal sectional view showing an example of an apparatus for carrying out the method of the present invention.
【図２】この発明の方法を実施するための装置の他の例
を示す概略縦断面図である。FIG. 2 is a schematic longitudinal sectional view showing another example of an apparatus for carrying out the method of the present invention.
１ タンディッシュ ２ スライディングゲート ３ 浸漬ノズル ４ 鋳型 ５ 導管 ６ ガス容器 ７ 容器 ８ バルブ ９ 支管 １０ 圧力ゲージ １１ バルブ １２ ストッパ １３ ポーラスプラグ 1 Tundish 2 Sliding gate 3 Immersion nozzle 4 Mold 5 Conduit 6 Gas container 7 Container 8 Valve 9 Branch pipe 10 Pressure gauge 11 Valve 12 Stopper 13 Porous plug
Claims (2)
成し、形成された鋳片を鋳型内から連続的に引き抜く、
溶融金属の連続鋳造方法において、弗化カーボン粉末ま
たは弗化カーボンを含有する粉末を、前記鋳型内の前記
溶融金属の表面上または前記溶融金属中に添加して、そ
の熱分解により発生したガスにより、溶融金属中の水素
および酸素を除去し、且つ、溶融金属の流動性を向上さ
せることを特徴とする、溶融金属の連続鋳造方法。Claim 1: Injecting molten metal into a mold to form a slab, and continuously pulling out the formed slab from within the mold.
In the continuous casting method of molten metal, fluorinated carbon powder or powder containing fluorinated carbon is added onto the surface of the molten metal in the mold or into the molten metal, and the gas generated by the thermal decomposition of the fluorinated carbon powder is added to the molten metal. A continuous casting method for molten metal, characterized by removing hydrogen and oxygen from the molten metal and improving the fluidity of the molten metal.
ボンを含有する粉末の、前記溶融金属の表面上または前
記溶融金属中への添加を、ノズル、または、タンディッ
シュに取り付けられたストッパのポーラスプラグを通し
、不活性のキャリアガスを介して行う、請求項１記載の
方法。2. The addition of the fluorinated carbon powder or the powder containing fluorinated carbon onto the surface of the molten metal or into the molten metal is performed using a nozzle or a porous plug of a stopper attached to a tundish. 2. The method of claim 1, wherein the process is carried out via an inert carrier gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4413491A JPH04262840A (en) | 1991-02-15 | 1991-02-15 | Method for continuously casting molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4413491A JPH04262840A (en) | 1991-02-15 | 1991-02-15 | Method for continuously casting molten metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04262840A true JPH04262840A (en) | 1992-09-18 |
Family
ID=12683158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4413491A Pending JPH04262840A (en) | 1991-02-15 | 1991-02-15 | Method for continuously casting molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04262840A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014781A (en) * | 2014-06-17 | 2014-09-03 | 常州东大中天钢铁研究院有限公司 | Device and method for adding rare earth through powder injection of continuous casting tundish stopper rod |
| CN110181011A (en) * | 2019-06-25 | 2019-08-30 | 华北理工大学 | A kind of method and its system improving Continuous Casting Square, round billet surface quality |
-
1991
- 1991-02-15 JP JP4413491A patent/JPH04262840A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104014781A (en) * | 2014-06-17 | 2014-09-03 | 常州东大中天钢铁研究院有限公司 | Device and method for adding rare earth through powder injection of continuous casting tundish stopper rod |
| CN110181011A (en) * | 2019-06-25 | 2019-08-30 | 华北理工大学 | A kind of method and its system improving Continuous Casting Square, round billet surface quality |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4504914B2 (en) | Aluminum ingot manufacturing method, aluminum ingot, and protective gas for manufacturing aluminum ingot | |
| US3465811A (en) | Plants for the continuous casting of steel | |
| JP2707288B2 (en) | Continuous casting method of aluminum-lithium alloy | |
| TWI654041B (en) | Continuous casting method | |
| JPH04262840A (en) | Method for continuously casting molten metal | |
| KR100916145B1 (en) | refractories of submerged entry nozzle for continuos casting | |
| JP3141187B2 (en) | Powder for continuous casting of steel | |
| JP2707283B2 (en) | Metal continuous casting method | |
| KR101193850B1 (en) | Method for detecting dropping alien substance of submerged entry nozzle and continuous casting method using the same | |
| CN113333702A (en) | High-carbon chromium bearing steel continuous casting crystallizer casting powder and application thereof | |
| JP3004657B2 (en) | Powder and casting method for casting high aluminum content steel | |
| JPS6138152B2 (en) | ||
| US3718173A (en) | Method of removing alumina scum from a continuous-casting mold | |
| JPH07214263A (en) | Molding powder for continuous casting | |
| KR101159598B1 (en) | Method for estimating mold powder's viscosity | |
| JPS5923898B2 (en) | Continuous casting method for high silicon aluminum alloy | |
| JP3546137B2 (en) | Steel continuous casting method | |
| JP4264286B2 (en) | Continuous casting nozzle | |
| JP2019515797A (en) | Mold flux and casting method using the same | |
| JPH0620622B2 (en) | Nozzle for continuous casting | |
| US1125158A (en) | Process of making clad metals. | |
| JP3348988B2 (en) | Cleaning method for molten steel in tundish | |
| JPS60234740A (en) | Continuous casting method of copper ingot having mirror finished surface | |
| JPH03110043A (en) | Vertical type continuous casting apparatus for metal | |
| SU1764803A1 (en) | Slag-forming mixture for protection of alloy against contact with atmosphere |