JPH0154155B2 - - Google Patents
Info
- Publication number
- JPH0154155B2 JPH0154155B2 JP13585087A JP13585087A JPH0154155B2 JP H0154155 B2 JPH0154155 B2 JP H0154155B2 JP 13585087 A JP13585087 A JP 13585087A JP 13585087 A JP13585087 A JP 13585087A JP H0154155 B2 JPH0154155 B2 JP H0154155B2
- Authority
- JP
- Japan
- Prior art keywords
- heat insulating
- heat
- insulating agent
- casting
- less
- 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
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- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 31
- 239000003795 chemical substances by application Substances 0.000 claims description 27
- 239000000292 calcium oxide Substances 0.000 claims description 16
- 235000012255 calcium oxide Nutrition 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 10
- 235000014653 Carica parviflora Nutrition 0.000 claims description 9
- 241000243321 Cnidaria Species 0.000 claims description 9
- 239000011435 rock Substances 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000009628 steelmaking Methods 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 2
- 239000002184 metal Substances 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000010304 firing Methods 0.000 description 6
- 239000000395 magnesium oxide Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000005550 wet granulation Methods 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
本発明は、製鋼、鋳造等における溶鋼又は溶銑
等の溶融金属表面にふりかけ添加し、該表面より
の熱放散を少なくしてその温度低下を防止する製
鋼、鋳造用保温剤に関し、特に非発熱性非炭素型
の保温材の改良に関する。Detailed Description of the Invention <Industrial Application Field> The present invention is a method of adding sprinkling to the surface of molten metal such as molten steel or hot metal in steel making, casting, etc. to reduce heat dissipation from the surface and reduce the temperature. This invention relates to heat insulators for steel manufacturing and casting, and particularly to improvements in non-heat generating, non-carbon type heat insulators.
＜従来の技術＞
製鋼、鋳造等において高炉等より出湯された溶
融金属は、混銑車へ給湯されて次工程の転炉その
他の作業部内へ移送されているが、この間にその
表面放散熱により溶融金属の温度が低下し、次工
程の作業に支障を生ずるおそれがある。そこでこ
の温度低下を防止するため、各種の保温剤が溶融
金属表面を被覆するようにふりかけ添加されてい
る。そして、この種の保温剤として、鋼材、鋳鉄
の品質安定の見地から、非発熱性非炭素型のもの
を使用することが多い。<Prior art> In steelmaking, casting, etc., molten metal discharged from a blast furnace, etc. is fed to a mixer car and transferred to a converter or other working area for the next process. The temperature of the metal may drop, causing problems in the next process. In order to prevent this temperature drop, various types of heat insulating agents are sprinkled and added to coat the surface of the molten metal. As this type of heat insulating agent, a non-heat generating, non-carbon type is often used from the viewpoint of stable quality of steel materials and cast iron.
この非発熱性非炭素型保温剤は、耐火度が高く
て比較的安価に入手できる石灰石、ドロマイト及
びマグネサイト系の微粉体、もしくはそれらの焼
成物、水和物を原料としており、これらをスプレ
ー法により中空球体とした造粒品、又は気泡ある
いは軽量骨材を混入して軽量化した焼成酸化物、
乾燥水酸化物の造粒品からなるものであつた。 This non-pyrogenic, non-carbon type heat insulating agent is made from fine powders of limestone, dolomite and magnesite, which have high fire resistance and are available at a relatively low price, or their calcined products or hydrates. Granulated products made into hollow spheres by a method, or baked oxides made lighter by mixing air bubbles or lightweight aggregates,
It consisted of a granulated product of dry hydroxide.
＜発明が解決しようとする問題点＞
非発熱性非炭素型保温剤は前記したように、空
気断熱層の形成のために種々の軽量化手段を講じ
ているが、いずれの場合も耐火度の高い原料を湿
式造粒後、焼成もしくは乾燥して製品化してい
る。したがつて、湿式造粒工程が不可欠となつて
コスト高となつた。<Problems to be Solved by the Invention> As mentioned above, various weight reduction measures have been taken for non-heat generating, non-carbon type heat insulating agents to form an air insulation layer, but in all cases, the fire resistance is After wet granulation of expensive raw materials, products are produced by firing or drying. Therefore, a wet granulation process has become indispensable, resulting in high costs.
＜問題点を解決するための手段＞
以上のように、非発熱性非炭素型保温剤はCaO
（酸化カルシウム）ないしMgO（マグネシア）系
構造部の軽量化でコスト高になつて汎用性を失つ
ているのにかんがみ、CaO系で安価な軽量化法を
模索している段階で、鹿児島県及び沖縄県地方に
産する第四紀石灰石鉱床及び現世リーフ堆積物等
を総称した造礁サンゴ岩は、石灰石（密度2.9
ｇ／cm3）や工業用生石灰（見掛け密度1.8〜2.1
ｇ／cm3）に対し、多孔質であるため見掛け密度が
1.4〜1.5ｇ／cm3を中心とした軽量であること、及
び市販のCaO、MgO系を主成分とする一般の保
温剤の見掛け密度が0.4〜1.5ｇ／cm3程度である点
に着目し、前記造礁さんご岩を焼成後、粗砕、整
粒して使用することにより、工業用生石灰に近い
安価な保温剤が得られることを見出し、本発明に
到達したものである。<Means to solve the problem> As mentioned above, non-heat generating non-carbon type heat insulating agent is CaO
In light of the fact that reducing the weight of (calcium oxide) or MgO (magnesia) based structures has increased costs and lost versatility, Kagoshima Prefecture and Reef-building coral rocks, which collectively refer to Quaternary limestone deposits and modern reef deposits produced in the Okinawa region, are limestone (density 2.9
g/cm 3 ) and industrial quicklime (apparent density 1.8 to 2.1
g/cm 3 ), but because it is porous, the apparent density is
We focused on the fact that it is lightweight, with a density of 1.4 to 1.5 g/cm 3 , and that the apparent density of commercially available general heat insulating agents whose main ingredients are CaO and MgO is approximately 0.4 to 1.5 g/cm 3 . The present invention was achieved based on the discovery that an inexpensive heat insulating agent similar to that of industrial quicklime can be obtained by using the reef-building coral rock after firing, crushing it, and sizing it.
即ち、本発明の製鋼、鋳造用保温剤は、造礁さ
んご岩が焼成処理されて得られる軽質生石灰の粗
砕、整粒物からなる非発熱性非炭素型の製鋼、鋳
造用保温剤であつて、粗砕・整粒物の粒度が２〜
50mmであり、また、前記軽質生石灰の組成がCaO
とMgOの合計48％以上、かつ、不純物として
SiO2が２％以下、硫黄及びリンが0.5％以下であ
ることを特徴とする。 That is, the heat insulating agent for steel making and casting of the present invention is a non-heat generating, non-carbon type heat insulating agent for steel making and casting, which is made of coarsely crushed and sized light quicklime obtained by firing reef-building coral rock. If the particle size of coarsely crushed/sized particles is 2~
50mm, and the composition of the light quicklime is CaO
and MgO in total of 48% or more, and as impurities
It is characterized by containing less than 2% SiO 2 and less than 0.5% sulfur and phosphorus.
本発明の保温剤の原料となる造礁さんご岩の見
掛け密度は1.3〜1.8ｇ／cm3の範囲が望ましく、見
掛け密度が1.3ｇ／cm3未満のものは工業的に大量
確保することが困難であり、また、見掛け密度が
1.8ｇ／cm3を越すと、焼成処理しても保温効果に
密接な関係のあるかさ高さがなくなつて断熱保温
効果が低下する。 The apparent density of reef-building coral rock, which is the raw material for the heat insulating agent of the present invention, is preferably in the range of 1.3 to 1.8 g/cm 3 , and those with an apparent density of less than 1.3 g/cm 3 can be obtained in large quantities industrially. It is difficult, and the apparent density
When it exceeds 1.8 g/cm 3 , the bulkiness, which is closely related to the heat retention effect, is lost even after firing, and the heat insulation effect decreases.
造礁さんご岩の焼成処理は、ロータリーキルン
又はシヤフトキルンを使用する。焼成処理条件
は、通常、1100〜1500℃×１〜２時間とする。こ
こで1100℃未満では、さんご岩内の結晶水が飛ば
ず、1500℃を越えると、焼結して多孔構造が消失
しやすく、それぞれ望ましくない。 A rotary kiln or a shaft kiln is used for firing the reef-building coral rock. The firing treatment conditions are usually 1100 to 1500°C for 1 to 2 hours. Here, if the temperature is less than 1100°C, the crystal water in the coral rock will not be blown away, and if it exceeds 1500°C, the porous structure will easily disappear due to sintering, which are both undesirable.
この保温剤の粒度は２〜50mmとされていて、こ
の粒度範囲内においては所定のかさ高さが得られ
るとともに溶融金属面上への投入時の飛散、発塵
等が少ないので作業上好都合である。なお、粒度
が２mmより小さくなるとかさ高さは高くなるが投
入時に飛散したり、炉壁の耐火物部分への付着が
激しくなつて作業性が低下し、また、粒度が50mm
を越えると、溶融金属面上へ投入堆積させた場合
の隣接粒体間に形成される空隙が大きくなり過
ぎ、良好な断熱空気層の形成を防げることがあ
る。なお、溶融金属上に保温剤をふりかけて形成
する被覆保温層の厚みは、通常、30〜50mmとす
る。 The particle size of this heat insulating agent is 2 to 50 mm, and within this particle size range, a specified bulkiness can be obtained, and there is less scattering and dust generation when pouring it onto the molten metal surface, making it convenient for work. be. Note that if the grain size is smaller than 2 mm, the bulk will be high, but the workability will be reduced due to scattering during charging or adhesion to the refractory part of the furnace wall, and if the grain size is less than 50 mm.
If it exceeds this value, the voids formed between adjacent grains when deposited on a molten metal surface become too large, which may prevent the formation of a good heat insulating air layer. The thickness of the heat-insulating coating layer formed by sprinkling a heat-insulating agent on the molten metal is usually 30 to 50 mm.
また、成分においてはCaOとMgOの合計が48
％以上であることが望ましい。48％未満では、所
要の保温特性を得がたい。不純物としてSiO2（二
酸化ケイ素）は２％以下、硫黄及びリンは0.5％
以下、好ましくは0.1％以下がよい。これより不
純物が多いと保温剤の融点を降下させて保温効果
を低減させ、また、耐火物部分への付着現象を生
じ、更に、溶鋼、溶銑成分の変動を生ずる等によ
り好ましくない。 In addition, the total of CaO and MgO is 48
% or more is desirable. If it is less than 48%, it is difficult to obtain the required heat retention properties. As impurities, SiO 2 (silicon dioxide) is 2% or less, sulfur and phosphorus are 0.5%.
The content is preferably 0.1% or less. If there are more impurities than this, the melting point of the heat insulating agent will be lowered, reducing the heat insulating effect, adhesion to the refractory parts, and fluctuations in the molten steel and hot metal components, which are undesirable.
＜発明の効果＞
本発明に係る非発熱性非炭素型の、鋳造用保温
剤は、天然産の造礁さんご岩を焼成した軽質生石
灰を粗砕、整粒したものからなり、炭素分はな
く、かつSiO2及び水分も極めて少なく、湿式造
粒工程が不要であるから、安価で工業用生石灰に
近いコストで製造可能となり、製鋼、鋳造時等の
あらゆるプロセスにおける保温剤として好適であ
る。しかも混銑車により移送される溶融金属表面
に使用すれば、次工程の精練、製鋼用等の転炉作
業において、十分顕熱を蓋積した造滓剤として有
効に使用される。更に、精練が終つて連鋳作業に
移る場合、不純物が極めて少ないので使用に際し
て水素のピツクアツプ等による溶融金属の組成変
動がほとんどなく、なかでも炭素のピツクアツプ
防止に極めて有効である。また、不純物が極小で
あるため融点が2000℃以上と高く、したがつて、
鋼浴上の微量のスラグとも反応し難いので、スラ
グの巻込み防止効果もあり、汎用性をもつた石灰
質保温剤として実用化が可能となり、製鋼、鋳造
用に極めて有用である。<Effects of the Invention> The non-heat generating, non-carbon type heat insulating agent for casting according to the present invention is made of coarsely crushed and sized light quicklime obtained by calcining naturally produced reef-building coral rock, and the carbon content is low. Since it contains very little SiO 2 and moisture, and does not require a wet granulation process, it can be produced at a low cost and at a cost close to that of industrial quicklime, making it suitable as a heat insulating agent in all processes such as steel manufacturing and casting. Moreover, if it is used on the surface of molten metal transported by a pig iron mixer car, it can be effectively used as a slag-forming agent with sufficient sensible heat in the next process of smelting and converter operations such as steel manufacturing. Furthermore, when the continuous casting operation is started after scouring, there are very few impurities, so there is almost no change in the composition of the molten metal due to hydrogen pick-up during use, and it is particularly effective in preventing carbon pick-up. In addition, since the impurities are extremely small, the melting point is as high as 2000℃ or more, and therefore,
Since it is difficult to react with even the slightest amount of slag on a steel bath, it has the effect of preventing slag entrainment, and can be put to practical use as a versatile calcareous heat insulating agent, making it extremely useful for steel manufacturing and casting.
＜実施例＞
以下に本発明の実施例について保温効果の確認
試験を行なつたのでそれについて説明する。<Example> Hereinafter, a test was conducted to confirm the heat retention effect of an example of the present invention, and this will be explained.
実施例の保温剤は、造礁さんご岩（沖縄産；見
掛け密度1.54ｇ／cm3）をロータリーキルンにより
1200℃で1.5時間焼成した軽質生石灰を、粒度３
〜７mmに粗砕、整粒して得た。得られた保温剤の
仕様を下記に示す。 The heat insulating agent in the example was made from reef-building coral rock (produced in Okinawa; apparent density 1.54 g/cm 3 ) in a rotary kiln.
Light quicklime calcined at 1200℃ for 1.5 hours is made into a grain size of 3.
It was obtained by coarsely crushing and sizing to ~7 mm. The specifications of the obtained heat insulating agent are shown below.
（保温剤仕様）
見掛け密度…0.91ｇ／cm3
かさ密度…0.57ｇ／cm3
CaO＋MgO…70.8％
SiO2…1.1％
強熱減量…26.3％
水分…１％未満
こうして得た保温剤を用いて、保温効果を確認
するために、下記試験を行なつた。まず、JIS
G2202の鋳物用銑（１種１号Ａ）８Kgを10Kg溶解
用高周波誘導炉により溶解し、1600℃に保持した
状態の溶融金属を調製する。この溶融金属上に実
施例保温材を、50mm厚さとなるよう添加し、その
後、電流を切つて溶融金属の表面温度効果を測定
した結果を図に示す。なお、比較のため、市販の
石灰質保温剤（見掛け密度；1.3〜1.5ｇ／cm3、粒
度；３〜７mm）ついて上記同様にして保温効果を
試験した。このとき、実施例及び市販の各保温材
の使用量は、それぞれ33ｇ、420ｇであつた。こ
のことから、本発明の保温剤は、格段に使用量が
少なくてすむことが分る。保温効果の試験結果を
示す第１図から、実施例の保温効果が格段に市販
品に比して優れていることが分かる。なお、参照
のために、保温剤なし曲線を第１図に示す。(Insulating agent specifications) Apparent density...0.91 g/cm 3 Bulk density...0.57 g/cm 3 CaO + MgO... 70.8% SiO 2 ... 1.1% Loss on ignition... 26.3% Moisture... less than 1% Using the heat insulating agent obtained in this way, In order to confirm the heat retention effect, the following test was conducted. First, JIS
Melt 8 kg of G2202 foundry pig iron (Type 1, No. 1 A) in a 10 kg melting high-frequency induction furnace to prepare molten metal maintained at 1600°C. The heat insulating material of the example was added to the molten metal to a thickness of 50 mm, and then the current was turned off to measure the surface temperature effect of the molten metal. The results are shown in the figure. For comparison, the heat retaining effect of a commercially available calcareous heat retaining agent (apparent density: 1.3 to 1.5 g/cm 3 , particle size: 3 to 7 mm) was tested in the same manner as above. At this time, the amounts used of each of the example and commercially available heat insulating materials were 33 g and 420 g, respectively. This shows that the heat retaining agent of the present invention can be used in a much smaller amount. From FIG. 1 showing the test results of the heat retention effect, it can be seen that the heat retention effect of the example is significantly superior to that of commercially available products. For reference, a curve without heat insulating agent is shown in FIG.
第１図は鋳造物用銑を溶解して1600℃に保持し
た溶銑上に保温剤を添加し、加熱停止して溶銑表
面温度と経過時間との関係を示すグラフ図であ
る。
FIG. 1 is a graph showing the relationship between the surface temperature of the hot metal and the elapsed time after a heat insulating agent is added to the hot metal which has been melted and maintained at 1600° C. after heating is stopped.
Claims (1)
生石灰の粗砕、整粒物からなる非発熱性非炭素型
の製鋼、鋳造用保温剤であつて、 前記粗砕、整粒物の粒度が２〜50mmであり、 また、 前記軽質生石灰の組成が、CaOとMgOの合計
48％以上、かつ、不純物としてSiO2が２％以下、
硫黄及びリンが0.5％以下である、 ことを特徴とする製鋼、鋳造用保温剤。[Scope of Claims] 1. A non-heat generating, non-carbon type heat insulating agent for steelmaking and casting, which is made of a coarsely crushed and sized light quicklime obtained by calcining reef-building coral rock, comprising: , the particle size of the sized product is 2 to 50 mm, and the composition of the light quicklime is the sum of CaO and MgO.
48% or more, and SiO 2 as an impurity is 2% or less,
A heat insulating agent for steel making and casting, characterized by containing 0.5% or less of sulfur and phosphorus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13585087A JPS63299851A (en) | 1987-05-29 | 1987-05-29 | Heat insulating material for steel making and casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13585087A JPS63299851A (en) | 1987-05-29 | 1987-05-29 | Heat insulating material for steel making and casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63299851A JPS63299851A (en) | 1988-12-07 |
| JPH0154155B2 true JPH0154155B2 (en) | 1989-11-16 |
Family
ID=15161226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13585087A Granted JPS63299851A (en) | 1987-05-29 | 1987-05-29 | Heat insulating material for steel making and casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63299851A (en) |
-
1987
- 1987-05-29 JP JP13585087A patent/JPS63299851A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63299851A (en) | 1988-12-07 |
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