JPH0741385B2 - Mold powder for continuous casting of steel - Google Patents
Mold powder for continuous casting of steelInfo
- Publication number
- JPH0741385B2 JPH0741385B2 JP8869792A JP8869792A JPH0741385B2 JP H0741385 B2 JPH0741385 B2 JP H0741385B2 JP 8869792 A JP8869792 A JP 8869792A JP 8869792 A JP8869792 A JP 8869792A JP H0741385 B2 JPH0741385 B2 JP H0741385B2
- Authority
- JP
- Japan
- Prior art keywords
- powder
- raw material
- steel
- mold
- continuous casting
- 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 - Lifetime
Links
- 239000000843 powder Substances 0.000 title claims description 41
- 229910000831 Steel Inorganic materials 0.000 title claims description 20
- 239000010959 steel Substances 0.000 title claims description 20
- 238000009749 continuous casting Methods 0.000 title claims description 13
- 239000002994 raw material Substances 0.000 claims description 45
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 claims description 14
- 229910000174 eucryptite Inorganic materials 0.000 claims description 14
- 229910052643 α-spodumene Inorganic materials 0.000 claims description 14
- 239000002893 slag Substances 0.000 description 23
- 238000002844 melting Methods 0.000 description 13
- 230000008018 melting Effects 0.000 description 11
- 238000005469 granulation Methods 0.000 description 10
- 230000003179 granulation Effects 0.000 description 10
- 238000005266 casting Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 229910018068 Li 2 O Inorganic materials 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- -1 and if necessary Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- VASIZKWUTCETSD-UHFFFAOYSA-N manganese(II) oxide Inorganic materials [Mn]=O VASIZKWUTCETSD-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- OBSZRRSYVTXPNB-UHFFFAOYSA-N tetraphosphorus Chemical compound P12P3P1P32 OBSZRRSYVTXPNB-UHFFFAOYSA-N 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼の連続鋳造用モール
ドパウダーに関する。FIELD OF THE INVENTION The present invention relates to a mold powder for continuous casting of steel.
【０００２】[0002]
【従来の技術】近年、鋼の連続鋳造の進歩は目覚まし
く、高温鋳片の無手入れ化(ＨＣＲ、ＨＤＲ)、高速鋳造
化、モールド断面形状の多様化、多連鋳化が進んでお
り、高温鋳片の無欠陥化と共にトラブル低減による連鋳
機稼働率の向上、安定化がＣＣプロセスにおける最大の
課題となっている。こういった状況下において、モール
ドパウダーの果たす役割は大きい。2. Description of the Related Art In recent years, the progress of continuous casting of steel has been remarkable, and high-temperature slabs have become unmaintained (HCR, HDR), high-speed casting, diversified mold cross-sectional shapes, and multi-casting. Improving and stabilizing the operating rate of the continuous casting machine by reducing defects and eliminating defects in cast slabs are the greatest challenges in the CC process. Under these circumstances, the mold powder plays a large role.
【０００３】モールドパウダーは各種鋼成分、各種鋳造
条件に適合するように品質設計がなされているが、特
に、品質設計が不適切な場合や品質設計は適切であって
も品質にバラツキがある場合には、高速鋳造ではブレー
クアウト等のトラブルによる連鋳機の停止を生じたり、
また、鋳片欠陥の原因となることが多い。モールドパウ
ダーの品質設計レベルの向上に伴って、鋼種によっては
品質の安定度が重要となっている。[0003] The quality of the mold powder is designed so as to meet various steel components and various casting conditions. Especially, when the quality design is inadequate or when the quality design is appropriate but the quality varies. In high-speed casting, the continuous casting machine may stop due to trouble such as breakout,
Further, it often causes a slab defect. With the improvement of the quality design level of mold powder, the stability of quality becomes important depending on the type of steel.
【０００４】鋼の連続鋳造においては、モールド内にお
いてモールドパウダーが添加される。浸漬ノズルを介し
てモールド内に注入された溶鋼表面上に添加されたモー
ルドパウダーは、溶鋼からの受熱により溶鋼表面より溶
融スラグ層、未溶融の原パウダー層の層状構造を形成
し、種々の役割を果たしながら鋼の凝固シェルとモール
ド間に流れ込み消費される。モールドと凝固シェルと
の潤滑作用、溶鋼中から浮上する介在物の溶解、吸収
作用、溶鋼の酸化防止、保温作用、凝固シェルとモ
ールド間の熱媒体としての作用が重要な役割である。す
なわち、一定厚みの溶融スラグ層厚みを確保しながら一
定量流れ込むことにより〜の役割が果たせ、健全な
鋳片を得ることができるのである。In continuous casting of steel, mold powder is added in the mold. The mold powder added on the molten steel surface injected into the mold through the immersion nozzle forms a layered structure of molten slag layer and unmelted raw powder layer from the molten steel surface by receiving heat from the molten steel and plays various roles. It is consumed by flowing between the solidified shell of steel and the mold. Lubrication between the mold and the solidified shell, dissolution of inclusions floating in molten steel, absorption, prevention of molten steel oxidation, heat retention, and function as a heat medium between the solidified shell and the mold are important roles. That is, when a certain amount of the molten slag layer is flowed while ensuring a certain thickness, the roles of ~ can be fulfilled and a sound cast piece can be obtained.
【０００５】特に、溶融スラグ層厚みが重要で、薄過ぎ
ると未溶融の原パウダー層と溶鋼湯面とが近付き、ちょ
っとした湯面変動で接触し易い状態となるため、ピンホ
ールや介在物といった鋳片欠陥が問題となり易い。厚過
ぎるとスラグベアを生成するなどの問題がある。また、
薄過ぎても、厚過ぎてもパウダースラグの不均一流入や
流入不足を生じ易く、割れやブレークアウトの原因とな
る。また、片流れなどの非定常が生じた時にトラブルと
なる確率が大きい。Particularly, the thickness of the molten slag layer is important. If the molten slag layer is too thin, the unmelted raw powder layer and the molten steel surface will come close to each other, and a slight fluctuation in the molten metal surface will make it easier to contact them. One-sided defects tend to be a problem. If it is too thick, there is a problem such as generation of slag bear. Also,
If the powder slag is too thin or too thick, the powder slag may flow unevenly or insufficiently, resulting in cracking or breakout. In addition, there is a high probability that a trouble will occur when an unsteady state such as one-way flow occurs.
【０００６】従って、溶融スラグ層厚みを決定する滓化
速度の設定が極めて重要であり、また、滓化速度を安定
化させることが必要である。Therefore, it is extremely important to set the slagging speed that determines the thickness of the molten slag layer, and it is necessary to stabilize the slagging speed.
【０００７】一般的なモールドパウダーには、ポルトラ
ンドセメント、黄リンスラグ、ウォラストナイト、高炉
スラグ、ダイカルシウムシリケート(２ＣａＯ・Ｓｉ
Ｏ2)、合成珪酸カルシウムなどを主原料基材として、必
要に応じて塩基度や嵩比重などの粉体特性調整のためシ
リカ原料を加え、更に、蛍石、氷晶石、硼砂、フッ化マ
グネシウムなどのフッ化物、炭酸ナトリウム、炭酸バリ
ウムなどの炭酸塩といった軟化点、粘度等の溶融特性調
整材としてのフラックス原料、溶融滓化速度調整材とし
ての炭素質原料などを混合した混合タイプや、炭素質原
料を除く成分の全部を予め溶融水砕したプリメルトタイ
プ、一部を予め溶融水砕したセミメルトタイプがある。
また、形状的には、粉末原料を混合した粉末タイプと更
に種々の方法で造粒した顆粒タイプがある。Typical mold powders include Portland cement, yellow phosphorus slag, wollastonite, blast furnace slag, dicalcium silicate (2CaO ・ Si).
O 2 ), synthetic calcium silicate, etc. as the main raw material base material, and if necessary, silica raw material for adjusting powder characteristics such as basicity and bulk specific gravity, and further fluorite, cryolite, borax, fluorinated A mixed type in which a fluoride raw material such as magnesium, a carbonate such as sodium carbonate and barium carbonate, a flux raw material as a melting property adjusting material such as viscosity, a carbonaceous raw material as a melt slag speed adjusting material, and the like, There are a pre-melt type in which all of the components except the carbonaceous raw material are previously melt-water granulated, and a semi-melt type in which a part of them are previously melt-water granulated.
In terms of shape, there are a powder type in which powder raw materials are mixed and a granule type in which granulation is performed by various methods.
【０００８】溶融パウダー層厚みを決定する溶融滓化速
度は、一部金属やその他の原料によってなされる場合も
あるが、基本的に炭素質原料によってなされており、炭
素質原料の粒度や使用量によって調整されているのが実
情である。The molten slag formation rate, which determines the thickness of the molten powder layer, is basically made of carbonaceous raw materials, although it may be made of some metals and other raw materials. The fact is that it is adjusted by.
【０００９】[0009]
【発明が解決しようとする課題】上記の如く、溶融パウ
ダースラグ層厚みを決定する溶融滓化速度の制御は炭素
質原料によってなされており、炭素質原料の粒度や使用
量によって調整されているのが実情である。As described above, the control of the molten slag formation rate that determines the thickness of the molten powder slag layer is performed by the carbonaceous raw material, and is adjusted by the particle size and the amount of use of the carbonaceous raw material. Is the reality.
【００１０】しかしながら、各種原料を混合あるいは混
合後造粒してなるいわゆる混合タイプの場合、モールド
内に添加された際に低融点原料から順次溶融するため、
場合によっては炭素質原料が溶融したガラス状物質で覆
われ、酸化燃焼できずに残るために溶融滓化速度のバラ
ツキにつながり、スラグベアーの巨大化や溶融パウダー
スラグ層厚みのバラツキ、そして最終的には鋳片品質の
劣化、場合によっては潤滑性不良によるブレークアウト
等の操業トラブルにつながる。特に、押出造粒、撹拌造
粒、噴霧造粒等の方法で製造された顆粒状パウダーにお
いてその傾向が著しい。However, in the case of a so-called mixed type, in which various raw materials are mixed or mixed and then granulated, the raw materials having a low melting point are sequentially melted when added into the mold,
In some cases, the carbonaceous raw material is covered with molten glassy material and remains unoxidized and burned, which leads to variations in the rate of molten slag, causing the slag bear to become huge and the molten powder slag layer to vary in thickness, and finally Causes deterioration of slab quality and, in some cases, operating trouble such as breakout due to poor lubricity. In particular, this tendency is remarkable in the granular powder produced by a method such as extrusion granulation, stirring granulation, and spray granulation.
【００１１】一方、高速鋳造への対応のためにはパウダ
ー消費速度を確保することが必要であり、パウダースラ
グの低粘度化のために炭酸リチウムなどのアルカリ金属
あるいはアルカリ土類金属の炭酸塩が使用される場合が
多い。しかしながら、これらの炭酸塩は分解反応が吸熱
反応であり、使用量が多くなり過ぎると、滓化溶融速度
の阻害やバランスの崩壊を引き起こす問題がある。更
に、上ノズル、スライドプレート、浸漬ノズルからＡｒ
などの不活性ガスを吹き込む場合には、これらのガスが
モールド内を浮上し、パウダー層中に入ってくるため、
そのガス量によってもパウダー中の炭素質原料の酸化は
不安定になり易い。こうした問題は、従来の鋳造速度の
遅い操業ではなかなか明確にならなかったが、高速鋳造
など操業条件の苛酷化とモールドパウダーの品質設計技
術の著しい向上により明らかとなった。On the other hand, in order to cope with high speed casting, it is necessary to secure a powder consumption rate, and in order to reduce the viscosity of the powder slag, an alkali metal carbonate such as lithium carbonate or an alkaline earth metal carbonate is used. Often used. However, the decomposition reaction of these carbonates is an endothermic reaction, and if the amount used is too large, there is a problem that the slag-melting rate is hindered and the balance is disrupted. In addition, Ar from upper nozzle, slide plate, dipping nozzle
When blowing an inert gas such as, these gases float in the mold and enter the powder layer,
Oxidation of the carbonaceous raw material in the powder tends to be unstable depending on the amount of gas. Although these problems were not readily apparent in conventional operations with slow casting speeds, they became apparent due to severe operating conditions such as high-speed casting and a marked improvement in quality design technology for mold powder.
【００１２】従って、本発明の目的は、滓化、溶融特性
に優れ、また、操業安定度、鋼品質の安定性向上に寄与
できる鋼の連続鋳造用モールドパウダーを提供すること
にある。Therefore, an object of the present invention is to provide a mold powder for continuous casting of steel which is excellent in slagging and melting characteristics and can contribute to improvement of operation stability and stability of steel quality.
【００１３】[0013]
【課題を解決するための手段】本発明者らは、上記課題
を解消するために種々検討を重ねた結果、炭素質原料の
酸化燃焼メカニズムを明らかにし、上述の如き欠点をす
べて克服できることを見出した。As a result of various studies to solve the above-mentioned problems, the present inventors have clarified the oxidative combustion mechanism of the carbonaceous raw material and found that all the above-mentioned drawbacks can be overcome. It was
【００１４】即ち、本発明に係る連続鋳造用モールドパ
ウダーは、αスポジュメン及び／またはαユークリプタ
イトを３〜４０重量％含有し、かつ(αスポジュメン及
び／またはαユークリプタイト)／炭素質原料の重量比
が１.５〜８.０であることを特徴とする。That is, the mold powder for continuous casting according to the present invention contains 3 to 40% by weight of α-spodumene and / or α-eucryptite and (α-spodumene and / or α-eucryptite) / carbonaceous raw material. The weight ratio is 1.5 to 8.0.
【００１５】[0015]
【作用】本発明者らは種々の研究、検討を重ねた結果、
以下の知見を得た。 溶融滓化速度は炭素質原料が各種原料の周囲に存在す
ることにより、受熱時に各原料間の接触、焼結を防げ、
各原料は溶融後、周囲の炭素質原料の酸化に伴って溶融
スラグ層中に入る。故に、炭素質原料の種類、粒度、添
加量を調整することにより溶融滓化速度の制御が可能と
なる。 しかしながら、各種原料を混合あるいは混合後造粒し
てなるいわゆる混合タイプの場合、モールド内に添加さ
れた際に低融点原料から順次溶融するため、場合によっ
ては炭素質原料が溶融したガラス状物質で覆われ、酸化
燃焼できずに残るために溶融滓化速度のバラツキなどの
原因となる。特に、低融点の炭酸塩使用量の多い場合に
著しい。よって、フラックス成分を炭酸塩以外の形で使
用することが望ましいが、αスポジュメン、αユークリ
プタイトはフラックス成分であるＬｉ2Ｏの含有量が多
く、炭酸塩等の低融点フラックス原料の使用量低減にも
有効である。 本発明者らが拘わる特願平３−57222号では、炭素質
原料を円滑に酸化させる方法として、炭酸塩を酸化促進
剤として活用する方法が提案されている。しかしなが
ら、シリカ質原料の添加量が限定されるなどの欠点を有
する。 炭素質原料を円滑に酸化させる方法として、モールド
内に添加され、溶鋼から受熱した時に溶融する前に相変
態を起こし、体積変化を起こす原料を活用する方法があ
ることを見出した。即ち、４００〜１０００℃で相変態
を起こすαスポジュメン及び／またはαユークリプタイ
トを活用することにより、炭素質原料が溶融したガラス
状物質で覆われるのを防ぎ、円滑な酸化燃焼が可能とな
ることが判明した。[Function] As a result of various studies and investigations by the present inventors,
The following findings were obtained. Since the carbonaceous raw material exists around various raw materials, the melting and slagging rate can prevent contact between the raw materials and sintering during heat reception,
After the raw materials are melted, they enter the molten slag layer as the surrounding carbonaceous raw material is oxidized. Therefore, it is possible to control the melting and slagging rate by adjusting the type, particle size and addition amount of the carbonaceous raw material. However, in the case of a so-called mixed type in which various raw materials are mixed or mixed and then granulated, since the low melting point raw materials are sequentially melted when added to the mold, the carbonaceous raw material may be a glassy substance melted in some cases. Since it is covered and remains unoxidized and burned, it causes variations in the melting and slag formation rate. Particularly, it is remarkable when a large amount of low melting point carbonate is used. Therefore, it is desirable to use the flux component in a form other than carbonate, but α-spodumene and α-eucryptite have a large content of Li 2 O, which is the flux component, and the amount of low-melting flux raw material such as carbonate used. It is also effective for reduction. Japanese Patent Application No. 3-57222, to which the present inventors are concerned, proposes a method of utilizing a carbonate as an oxidation accelerator as a method of smoothly oxidizing a carbonaceous raw material. However, it has drawbacks such as a limited amount of siliceous raw material added. As a method of smoothly oxidizing a carbonaceous raw material, it has been found that there is a method of utilizing a raw material which is added into a mold and undergoes a phase transformation before melting when receiving heat from molten steel to cause a volume change. That is, by utilizing α-spodumene and / or α-eucryptite, which undergoes a phase transformation at 400 to 1000 ° C., it is possible to prevent the carbonaceous raw material from being covered with the molten glassy substance, and to enable smooth oxidative combustion. It has been found.
【００１６】本発明の連続鋳造用モールドパウダーは上
記の知見を基になされたものである。即ち、αスポジュ
メン及び／またはαユークリプタイトを３〜４０重量％
含有し、かつ(αスポジュメン及び／またはαユークリ
プタイト)／炭素質原料との重量比を１.５〜８.０に限
定することにより溶融滓化速度安定性を高め、その使用
に際しては溶融パウダースラグ層厚みのバラツキをなく
し、最終的には鋳片品質の劣化、ブレークアウト等の操
業トラブルを防止できるものである。The mold powder for continuous casting of the present invention is based on the above findings. That is, 3 to 40% by weight of α-spodumene and / or α-eucryptite
The content of (α-spodumene and / or α-eucryptite) / carbonaceous raw material is limited to 1.5 to 8.0 to improve the stability of the molten slag, It is possible to eliminate variations in the thickness of the powder slag layer, and finally to prevent operational problems such as deterioration of slab quality and breakout.
【００１７】αスポジュメン及び／またはαユークリプ
タイトの添加量は３〜４０重量％が望ましい。３重量％
未満では効果は少ない。また、４０重量％を超えるとＳ
ｉＯ2量が多くなり、パウダーとしての溶融後パウダー
組成、塩基度の調整が困難になり好ましくない。また、
αスポジュメン及び／またはαユークリプタイトは完全
に結晶化した結晶度の高いものが望ましいが、一部非晶
質や他の結晶を含むものでも、純度８５％以上のもので
あれば良い。The amount of α-spodumene and / or α-eucryptite added is preferably 3 to 40% by weight. 3% by weight
Less than is less effective. Further, if it exceeds 40% by weight, S
It is not preferable because the amount of iO 2 increases and it becomes difficult to adjust the powder composition and basicity after melting as powder. Also,
It is desirable that α-spodumene and / or α-eucryptite is completely crystallized and has a high degree of crystallinity. However, even if it partially contains amorphous or other crystals, it may have a purity of 85% or more.
【００１８】(αスポジュメン及び／またはαユークリ
プタイト)／炭素質原料の重量比が１.５未満では効果が
少なく好ましくない。また、８.０を超えると炭素質原
料の酸化速度が大きくなり過ぎ、滓化速度が調整困難と
なり好ましくない。If the weight ratio of (α-spodumene and / or α-eucryptite) / carbonaceous raw material is less than 1.5, the effect is small and it is not preferable. On the other hand, if it exceeds 8.0, the oxidation rate of the carbonaceous raw material becomes too high, and the slagging rate becomes difficult to adjust, which is not preferable.
【００１９】なお、本発明の連続鋳造用モールドパウダ
ーにおいて、上記αスポジュメン及びαユークリプタイ
トを除く他の原料例えば基材原料、シリカ質原料、フラ
ックス原料、カーボン原料、金属、合金原料等は特に限
定されるものではなく、慣用の種々のものを使用するこ
とができる。In the continuous casting mold powder of the present invention, other raw materials other than α-spodumene and α-eucryptite, such as base material, siliceous raw material, flux raw material, carbon raw material, metal, alloy raw material are particularly preferable. It is not limited and various conventional ones can be used.
【００２０】また、本発明の極低炭素鋼用モールドパウ
ダーは前述の粉末原料を混合した粉末状または押出造
粒、撹拌造粒、流動造粒、転動造粒、噴霧造粒などの方
法で造粒した顆粒状にて使用することができる。造粒に
際しては、必要に応じて有機質、無機質のバインダーを
使用することができる。The mold powder for ultra-low carbon steel of the present invention is prepared by mixing the above-mentioned powder raw materials in the form of powder or extrusion granulation, stirring granulation, fluidized granulation, tumbling granulation, spray granulation and the like. It can be used in the form of granulated granules. At the time of granulation, an organic or inorganic binder can be used if necessary.
【００２１】[0021]
【実施例】以下に実施例を挙げて本発明の極低炭素鋼用
モールドパウダーを更に説明する。 実施例 以下の表１に本発明品及び比較品の配合及び実機での使
用結果を記載する。表１中、本発明品Ｎｏ.２及び４は
粉末原料混合物を加水混練し、押出造粒機によって柱状
に造粒した顆粒品であり、その他は粉末配合物をＶ型ミ
キサーにて混合した粉末品である。EXAMPLES The mold powder for ultra-low carbon steel of the present invention will be further described below with reference to examples. Examples Table 1 below shows the formulations of the products of the present invention and comparative products, and the results of use in actual machines. In Table 1, the product Nos. 2 and 4 of the present invention are granular products obtained by hydro-kneading the powder raw material mixture and granulating the mixture into a columnar shape by an extrusion granulator. Others are powders obtained by mixing the powder mixture with a V-type mixer. It is a product.
【００２２】[0022]
【表１】 [Table 1]
【００２３】なお、表１中の合成珪酸カルシウムは電気
炉で溶解後、冷却、粉砕した原料であり、Ｆｅ2Ｏ3、Ａ
ｌ2Ｏ3、Ｎａ2Ｏ、Ｋ2Ｏ、Ｌｉ2Ｏ、ＭｎＯ、ＴｉＯ2、
ＢａＯ、Ｂ2Ｏ3、Ｆ等を含み、Ａｌ2Ｏ3＋Ｎａ2Ｏ＋Ｋ2
Ｏ＋Ｆｅ2Ｏ3＋Ｌｉ2Ｏ＋ＭｎＯ＋ＴｉＯ2＋ＢａＯ＋Ｂ
2Ｏ3量が２０％未満である。また、主成分であるＣａＯ
とＳｉＯ2の比率がＡ、Ｂ、Ｃでは異なり、Ａが低Ｃａ
Ｏ／ＳｉＯ2品、Ｂが高ＣａＯ／ＳｉＯ2品、Ｃが中間品
である。The synthetic calcium silicate in Table 1 is a raw material which is melted in an electric furnace, cooled, and pulverized. Fe 2 O 3 , A
l 2 O 3 , Na 2 O, K 2 O, Li 2 O, MnO, TiO 2 ,
Including BaO, B 2 O 3 , F, etc., Al 2 O 3 + Na 2 O + K 2
O + Fe 2 O 3 + Li 2 O + MnO + TiO 2 + BaO + B
The amount of 2 O 3 is less than 20%. In addition, the main component CaO
The ratio of SiO 2 and SiO 2 is different in A, B and C, and A is low Ca
O / SiO 2 product, B is high CaO / SiO 2 product, and C is intermediate product.
【００２４】[0024]
【発明の効果】本発明に係る鋼の連続鋳造用モールドパ
ウダーは、αスポジュメン及び／またはαユークリプタ
イトを３〜４０重量％含有し、かつ(αスポジュメン及
び／またはαユークリプタイト)／炭素質原料重量比が
１.５〜８.０である構成としたので、滓化、溶融特性に
優れ、また、操業安定度、鋼品質の安定性向上に寄与で
きる。EFFECTS OF THE INVENTION The mold powder for continuous casting of steel according to the present invention contains 3 to 40% by weight of α-spodumene and / or α-eucryptite, and (α-spodumene and / or α-eucryptite) / carbon. Since the quality raw material weight ratio is set to 1.5 to 8.0, it is excellent in slag formation and melting characteristics, and can contribute to the improvement of operation stability and stability of steel quality.
Claims (1)
て、αスポジュメン及び／またはαユークリプタイトを
３〜４０重量％含有し、かつ(αスポジュメン及び／ま
たはαユークリプタイト)／炭素質原料重量比が１.５〜
８.０であることを特徴とする鋼の連続鋳造用モールド
パウダー。1. A mold powder for continuous casting of steel, containing 3 to 40% by weight of α-spodumene and / or α-eucryptite, and (α-spodumene and / or α-eucryptite) / carbonaceous raw material weight ratio. Is 1.5-
Mold powder for continuous casting of steel, which has a value of 8.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8869792A JPH0741385B2 (en) | 1992-04-09 | 1992-04-09 | Mold powder for continuous casting of steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8869792A JPH0741385B2 (en) | 1992-04-09 | 1992-04-09 | Mold powder for continuous casting of steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06285600A JPH06285600A (en) | 1994-10-11 |
| JPH0741385B2 true JPH0741385B2 (en) | 1995-05-10 |
Family
ID=13950055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8869792A Expired - Lifetime JPH0741385B2 (en) | 1992-04-09 | 1992-04-09 | Mold powder for continuous casting of steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0741385B2 (en) |
-
1992
- 1992-04-09 JP JP8869792A patent/JPH0741385B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06285600A (en) | 1994-10-11 |
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