JPH0480083B2 - - Google Patents
Info
- Publication number
- JPH0480083B2 JPH0480083B2 JP26717088A JP26717088A JPH0480083B2 JP H0480083 B2 JPH0480083 B2 JP H0480083B2 JP 26717088 A JP26717088 A JP 26717088A JP 26717088 A JP26717088 A JP 26717088A JP H0480083 B2 JPH0480083 B2 JP H0480083B2
- Authority
- JP
- Japan
- Prior art keywords
- pig iron
- converter
- heating
- heat
- hot metal
- 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
Links
- 229910000805 Pig iron Inorganic materials 0.000 claims description 37
- 239000002184 metal Substances 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 11
- 238000007670 refining Methods 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 34
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 238000005516 engineering process Methods 0.000 description 8
- 239000003575 carbonaceous material Substances 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 238000009628 steelmaking Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、転炉操業方法およびこれに用いる型
銑に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a converter operating method and a pig iron used therein.
近年、転炉製鋼において、コストダウン、高品
質化を意図して、100％溶銑予備処理銑配合操業
を実施する方向にある。
In recent years, there has been a trend in converter steelmaking to implement 100% hot metal pretreatment pig iron blending operations with the intention of reducing costs and improving quality.
このような予備処理銑では脱Si、脱Ｓ、脱Ｐが
十分に行われており、Ｃも低くなつているので転
炉製鋼における熱源が不足する傾向にある。 In such pretreated pig iron, the removal of Si, S, and P is sufficiently performed, and the carbon content is also low, so that the heat source in converter steelmaking tends to be insufficient.
一方、溶銑生産量に対して転炉製鋼量は変動が
大きいので、その伸縮性を保持するため、および
製鋼品質の安定を図るため、良質のスクラツプま
たは予備処理した冷銑を使用する必要がある。こ
の場合、さらに転炉製鋼の熱量が不足する。 On the other hand, since the amount of steel produced in a converter fluctuates significantly compared to the amount of hot metal produced, it is necessary to use high-quality scrap or pretreated cold pig iron in order to maintain its elasticity and stabilize the quality of steel production. . In this case, the amount of heat for steelmaking in the converter is further insufficient.
このような熱源不足を補う熱補償手段として
は、従来、ポストコンバツシヨン、炭材添加、装
入物予熱などがある。 Conventional heat compensation means to compensate for such a lack of heat source include post-compression, addition of carbonaceous material, charge preheating, and the like.
ポストコンバツシヨン技術は、転炉操業時に鋼
浴で生成したCOガスを炉内でO2と反応させCO2
とし、その時に発生する熱量を溶鋼に着熱させる
技術であり、これまでの実績では、H.R.（Hot
Ratio、熱量比）で４％相当の熱補償が可能とさ
れているに過ぎず、熱補償には不十分である。 Post-combustion technology involves reacting CO gas generated in a steel bath during converter operation with O 2 in the furnace to convert CO 2
This is a technology that heats the molten steel with the amount of heat generated at that time.
It is said that only 4% of heat compensation is possible in terms of heat ratio (heat ratio), which is insufficient for heat compensation.
炭材添加による熱補償としては、
（） 炉上から添加
（） 底からインジエクシヨン添加
による炭材添加方法があり、添加された炭材は鋼
浴中あるいは鋼浴面上で燃焼し、さらに生成した
COガスは上記のポストコンバツシヨン法で鋼浴
に熱付与する技術である。この方法によれば、炭
材の添加量によつてかなりの熱補償は可能である
が、炭材からの加硫や鋼浴面上での燃焼熱による
耐火物の溶損および精錬時間の延長などが生じ、
熱付与量には限度がある。 There are two methods of heat compensation by adding carbonaceous materials: () Addition from the top of the furnace () Injection addition from the bottom.The added carbonaceous material burns in the steel bath or on the surface of the steel bath, and is further generated.
CO gas is a technology that applies heat to the steel bath using the above-mentioned post-conversion method. According to this method, considerable heat compensation is possible depending on the amount of carbonaceous material added, but the vulcanization from the carbonaceous material and the combustion heat on the steel bath surface cause melting of the refractory and prolongation of the refining time. etc. occur,
There is a limit to the amount of heat applied.
また、従来の型銑形状は、ガス加熱に適した形
状ではないので加熱効率が低い。 Furthermore, the conventional shape of the pig iron is not suitable for gas heating, so the heating efficiency is low.
また、特公昭63−42685には固体材料を連続的
に反応器に装入し、反応器から発生したガスによ
り直接前記材料を加熱する方法が開示されてい
る。この技術は直接発生するガスを連続装入材料
例えば鋼スクラツプ、油状鋼スクラツプ、石炭な
どと熱交換させるので、材料の量、成分、形状お
よび製品品質の完全なバランスを必要とし、目標
鋼種を溶製するのが容易でない。 Further, Japanese Patent Publication No. 63-42685 discloses a method in which a solid material is continuously charged into a reactor and the material is directly heated by gas generated from the reactor. This technology involves heat exchange of the directly generated gas with a continuous charge of materials such as steel scrap, oily steel scrap, coal, etc., and therefore requires a perfect balance of material quantity, composition, shape and product quality to melt the target steel grade. It is not easy to manufacture.
現行の熱補償技術によると、ポストコンバツシ
ヨンでは熱補償量が熱量比で約４％と少なく、炭
材添加では熱補償量は十分あるが、加硫による鋼
の品質劣化の問題があり、かつ両方ともに多量の
熱負荷はコスト的にも問題がある。
According to the current heat compensation technology, the amount of heat compensation in post-conversion is small at about 4% in terms of heat ratio, and although there is sufficient amount of heat compensation with the addition of carbonaceous material, there is a problem of deterioration of the quality of steel due to vulcanization. In both cases, a large amount of heat load poses a problem in terms of cost.
本発明の目的は、これらの問題点を解決するも
のである。 The object of the present invention is to solve these problems.
本発明は溶銑予備処理を施した後表面に凹凸を
有し、単体実績率80％以下の形状に鋳造した銑鉄
を、バツチ式充填層型熱風加熱器内に装入し、該
加熱器内に熱風を吹込んで例えば800℃まで該銑
鉄を予熱し、該予熱した銑鉄を転炉内に装入し、
これに溶銑に加えて転炉精錬を行うことを特徴と
する転炉操業方法であり、またこの方法の実施に
用いるための転炉用型銑であつて、表面に凹凸を
設け、単体実績率80％以下の形状を有する単体か
らなる転炉用型銑である。
In the present invention, after pre-treatment of hot metal, the pig iron is cast into a shape that has irregularities on the surface and has a single unit performance rate of 80% or less, and is charged into a batch type packed bed hot air heater. Preheating the pig iron to, for example, 800°C by blowing hot air, and charging the preheated pig iron into a converter,
This is a converter operating method characterized by performing converter refining in addition to hot metal, and the converter mold pig iron used for implementing this method is provided with irregularities on the surface and has a single actual performance rate. This is a converter type pig iron consisting of a single piece with a shape of 80% or less.
このような型銑は、充填層型熱風加熱器内にお
いて加熱効率が良好となるよう上述のように型銑
形状を決定し、所定の鋳型を製作し、鋳銑機にセ
ツトし、この鋳銑機を用いて、現在一般的に実施
されている溶銑予備処理技術を適用して得られた
予備処理溶銑を、加熱効率の良好な形状を有する
形状に鋳銑する。 For such shaped pig iron, the shape of the shaped pig iron is determined as described above so that the heating efficiency is good in a packed bed type hot air heater, a specified mold is manufactured, it is set in a casting machine, and this cast pig iron is Using a machine, pretreated hot metal obtained by applying the hot metal pretreatment technology commonly practiced at present is cast into a shape having good heating efficiency.
本発明はこのようにして得られた型銑を充填層
型熱風加熱器内に装入し、所定温度に加熱し、そ
の後速やかに転炉に装入する。 In the present invention, the molded pig iron thus obtained is charged into a packed bed type hot air heater, heated to a predetermined temperature, and then promptly charged into a converter.
以下本発明の構成および作用を詳細に分説す
る。
The structure and operation of the present invention will be explained in detail below.
(1) 使用する冷鉄源
最も望ましいのは、転炉に装入する溶銑成分
と、加熱後装入する型銑の成分がほぼ同一である
ことである。コスト並びに、品質を考慮した時、
予備処理は脱Si、脱Ｐ、脱Ｓを施したものが好適
である。(1) Cold iron source to be used The most desirable thing is that the composition of the hot metal charged into the converter and the composition of the molded pig iron charged after heating are almost the same. When considering cost and quality,
As the preliminary treatment, it is preferable to remove Si, P, and S.
すなわち、冷鉄源として、予備処理を施した溶
銑を鋳銑した型銑を使用する。このような型銑は
低Ｐ、低Ｓ、低Si型銑である。 That is, as a source of cold iron, mold pig iron is used, which is made by casting pretreated hot metal. Such type pig iron is low P, low S, and low Si type pig.
(2) 熱補償の方法 一般に、物体を加熱する方法として、 (1) 低密度熱エネルギーを多量に使用して加熱 (2) 高密度熱エネルギーを少量使用して加熱 (3) 高密度熱エネルギーを多量使用して加熱 があり、主として到達加熱温度が決まる。(2) Method of thermal compensation Generally, as a method of heating an object, (1) Heating using a large amount of low-density thermal energy (2) Heating using a small amount of high-density thermal energy (3) Heating using a large amount of high-density thermal energy This mainly determines the heating temperature reached.
つまり、到達加熱温度が低、中温度域すなわち
約1000℃までは(1)または(2)、高温域では(2)または
(3)の加熱が一般的である。 In other words, (1) or (2) is used when the heating temperature reached is low to medium, that is, up to about 1000℃, and (2) or (2) is used when the heating temperature is high.
(3) Heating is common.
本技術の加熱温度は最高1000℃であり、上記(1)
の方法によつて、製鉄所で多量に発生する高炉ガ
ス、コークス炉ガス、転炉ガスまたはこれらの混
合ガスなどの安価なガスを使用して加熱すること
が可能である。 The heating temperature of this technology is a maximum of 1000℃, and the above (1)
By this method, it is possible to heat the steel using inexpensive gas such as blast furnace gas, coke oven gas, converter gas, or a mixture thereof, which is generated in large quantities in steel plants.
熱補償として、型銑を中温（例えば800℃）に
外部予熱することにより、
熱補償による硫黄などの汚染がない。 As heat compensation, by externally preheating the pig iron to a medium temperature (e.g. 800℃), there is no contamination such as sulfur due to heat compensation.
低温〜中温域の予熱に最も適したガス加熱 を利用することができ、経済的である。 Gas heating most suitable for preheating in the low to medium temperature range can be used and is economical.
第４図は高純度銑の予熱温度と配合率との関係
を示すものでこれにより配合率に応じて余熱温度
を定めることができる。 FIG. 4 shows the relationship between the preheating temperature of high-purity pig iron and the blending ratio, which allows the preheating temperature to be determined according to the blending ratio.
(3) ガス加熱に適した型銑形状
型銑を加熱炉に装入した時、加熱ガス流れが良
好な程、加熱効率が向上する。そこで、型銑の表
面に凹凸を設け、これを単体実績率で表示して伝
熱性能を比較した。第２図ａ〜ｄはこのような型
銑１０を例示したものである。ここに単体実績率
とは単体の型銑に外接する最小の直方体の容積に
対する型銑自身の容積との比を百分率で表わした
値をいう。(3) Shape of pig iron suitable for gas heating When pig iron is charged into a heating furnace, the better the flow of heating gas, the better the heating efficiency. Therefore, the heat transfer performance was compared by creating irregularities on the surface of the mold pig iron and displaying the irregularities as a single actual rate. FIGS. 2a to 2d illustrate such a type pig iron 10. Here, the unit performance rate is a value expressed as a percentage of the ratio of the volume of the pig iron itself to the volume of the smallest rectangular parallelepiped circumscribing the single pig pig.
第１図に示したバツチ式充填層型熱風加熱器に
おいて、型銑を加熱したときの単体実績率と加熱
効率との関係を第３図に示す。実体積率が80％以
下の時、良好な加熱効率が得られる。 FIG. 3 shows the relationship between the individual performance rate and the heating efficiency when heating the pig iron in the batch type packed bed hot air heater shown in FIG. 1. Good heating efficiency can be obtained when the actual volume ratio is 80% or less.
200トン上底吹転炉において本発明法による転
炉操業を実施した。
A converter operation using the method of the present invention was carried out in a 200-ton top-bottom blowing converter.
第２図ｃに示す形状を有し、予備処理後の溶銑
成分が下記のような予備処理型銑を製造し、これ
を所定の鋳型に鋳銑した。 A pretreated pig iron having the shape shown in FIG. 2c and having the following hot metal components after pretreatment was manufactured, and this was cast into a predetermined mold.
Ｃ：4.21重量％
Si：0.01重量％
Mn：0.24重量％
Ｐ：0.03重量％
Ｓ：0.02重量％
この型銑１０は外接する直方体が幅10cm×長さ
30cm×高さ20cmで単体実績率は約69.3％である。 C: 4.21% by weight Si: 0.01% by weight Mn: 0.24% by weight P: 0.03% by weight S: 0.02% by weight The circumscribed rectangular parallelepiped of this pig iron 10 is 10cm wide x length
30cm x height 20cm, the single performance rate is approximately 69.3%.
次に、この型銑を第１図に示すバツチ式充填層
型加熱器１に装入し加熱する。このバツチ式充填
層型熱風加熱器１は、加熱兼装入鍋２の底部に熱
風通気孔３を備えている。加熱兼装入鍋２はバー
ナ５、２次空気導入管６を備えた熱風発生炉４上
に載置されて加熱される。この加熱兼装入鍋２の
内容積は、転炉の１ヒート処理量の５〜20％の冷
銑を収納する大きさでよい。また着脱可能な蓋８
を備え、この蓋８には排ガス管７を備えている。
また図示しない吊装置を備え、転炉に内容物を容
易に装入することができる。 Next, this molded pig iron is charged into a batch-type packed bed heater 1 shown in FIG. 1 and heated. This batch type packed bed type hot air heater 1 is equipped with a hot air ventilation hole 3 at the bottom of a heating/charging pot 2. The heating/charging pan 2 is placed on a hot air generating furnace 4 equipped with a burner 5 and a secondary air introduction pipe 6 to be heated. The internal volume of this heating/charging ladle 2 may be large enough to accommodate cold pig iron corresponding to 5 to 20% of the one heat processing amount of the converter. Also, a removable lid 8
The lid 8 is equipped with an exhaust gas pipe 7.
Moreover, it is equipped with a hanging device (not shown), so that the contents can be easily charged into the converter.
バツチ式充填層型加熱器の１例の仕様およびそ
の加熱例は次の通りである。 The specifications of one example of the batch-type packed bed heater and its heating example are as follows.
加熱兼装入鍋形状：
内径：1.5ｍ
充填高さ：1.77ｍ
装入量：14トン（配合率７％）
加熱温度：800℃
加熱時間：1hr
加熱炉兼装入鍋：初期温度 400℃
冷銑初期温度：10℃
単体実績率：0.64
必要熱量：QN＝14000Kg×0.2Kcal／Kg℃
×（800−10）℃＝2.2×106Kcal／hr
加熱ガス温度：1000℃
排ガス温度：400℃（平均）
熱ガス量：
Vg＝2.2×106／0.35（1000−400）
＝10.5×103Ｎm2／hr
供給カロリー：
Qg＝10.5×103×1000×0.38
＝4.0×106Kcal／hr
熱効率：
η＝QN／Qg＝2.2×106／4.0×106×100
＝55.0（％）
転炉は、出鋼後所定の炉修を実施し、上記バツ
チ式充填型熱風加熱器で800℃に予熱した型銑を
装入し、続いて、予備処理を施した溶銑186tを装
入し、吹錬を開始し、吹錬開始後は、通常の転炉
の操業を実施した。 Heating and charging pot shape: Inner diameter: 1.5m Filling height: 1.77m Charging amount: 14 tons (compound ratio 7%) Heating temperature: 800℃ Heating time: 1hr Heating furnace and charging pot: Initial temperature 400℃ Cold Initial pig temperature: 10℃ Single actual rate: 0.64 Required heat: Q N = 14000Kg×0.2Kcal/Kg℃×(800−10)℃=2.2×10 6 Kcal/hr Heating gas temperature: 1000℃ Exhaust gas temperature: 400℃ (Average) Amount of hot gas: Vg = 2.2 x 10 6 /0.35 (1000-400) = 10.5 x 10 3 Nm 2 /hr Calories supplied: Qg = 10.5 x 10 3 x 1000 x 0.38 = 4.0 x 10 6 Kcal/hr Thermal efficiency: η = Q N /Qg = 2.2 × 10 6 / 4.0 × 10 6 × 100 = 55.0 (%) The converter was subjected to the specified furnace repair after tapping, and the above batch-type filling hot air heater was used to heat the converter to 800 Pig iron preheated to ℃ was charged, followed by 186 tons of pretreated hot metal, and blowing was started. After the start of blowing, normal converter operation was carried out.
比較例
100トン上底吹転炉を用いて炭材上添加法を行
なつた。スクラツプ比を20％上昇させた時の操業
例は以下の通りであつた。なお、比較例と共に従
来の通常の例を併せて示した。Comparative Example A charcoal material addition method was carried out using a 100-ton top-bottom blowing converter. An example of operation when the scrap ratio was increased by 20% was as follows. In addition, a conventional conventional example is shown together with a comparative example.
不純成分、製鋼歩止、耐火物の溶損量は通常ベ
ースとの差を掲げた。 Differences from the normal base were listed for impurity components, steel production yield, and the amount of erosion of refractories.
比較例 通常
溶銑： 70トン （90トン）
スクラツプ：30トン （10トン）
昇温用熱源：８トン （０トン）
（コークス）
副原料（石灰等）：3.9トン （1.5トン）
製鋼時間：43分 （18分）
不純成分：＋0.2 （ベース）
（Cu＋Ni＋Cr）
製鋼歩止：−2.3％ （ベース）
耐火物の溶損量：＋25％ （ベース）
〔発明の効果〕
生産計画に対して溶銑が不足する時、例えば、
(イ) 高炉が不調となり、所要量の溶銑が生産され
ない時、
(ロ) 高炉改修時の溶銑不足時、
(ハ) 景気変動があり、上方に振れた時の溶銑不足
時、
があり、この時備蓄してあつた型銑を配合して生
産計画を達成することができる。 Comparative example Normal Hot metal: 70 tons (90 tons) Scrap: 30 tons (10 tons) Heat source for heating: 8 tons (0 tons) (coke) Sub-materials (lime, etc.): 3.9 tons (1.5 tons) Steelmaking time: 43 (18 minutes) Impurity component: +0.2 (base) (Cu+Ni+Cr) Steelmaking yield: -2.3% (base) Amount of corrosion of refractory: +25% (base) [Effect of the invention] Hot metal compared to production plan For example, when there is a shortage of hot metal, for example: (a) when the blast furnace is in a bad condition and the required amount of hot metal is not produced; (b) when there is a shortage of hot metal during blast furnace renovation; (c) when there is an economic fluctuation and the demand for hot metal increases. When there is a shortage, the production plan can be achieved by blending the stockpiled mold pig iron.
第１図は本発明の実施に用いるバツチ式充填層
型熱風加熱器の縦断面図、第２図は本発明の型銑
の例を示す斜視図、第３図は単体実績率と加熱効
率の関係を例示したグラフ、第４図は予熱温度と
配合率との関係を示すグラフである。
１……バツチ式充填層型熱風加熱器、２……加
熱兼装入鍋、３……熱風通気孔、４……熱風発生
炉、５……バーナ、６……２次空気管、７……排
ガス管、８……蓋、１０……型銑。
Fig. 1 is a longitudinal cross-sectional view of a batch-type packed bed hot air heater used in the implementation of the present invention, Fig. 2 is a perspective view showing an example of the molded pig iron of the present invention, and Fig. 3 is a graph showing the individual performance rate and heating efficiency. A graph illustrating the relationship, FIG. 4 is a graph showing the relationship between preheating temperature and blending ratio. 1... Batch type packed bed hot air heater, 2... Heating/charging pan, 3... Hot air vent, 4... Hot air generating furnace, 5... Burner, 6... Secondary air pipe, 7... ...exhaust gas pipe, 8...lid, 10...mould pig iron.
Claims (1)
単体実績率80％以下の形状に鋳造した銑鉄を、バ
ツチ式充填層型熱風加熱器内に装入し、該加熱器
内に熱風を吹込んで該銑鉄を予熱し、該予熱した
銑鉄を転炉内に装入し、これに溶銑に加えて転炉
精錬を行うことを特徴とする転炉操業方法。 ２ 表面に凹凸を有し、単体実績率80％以下の形
状を有する単体からなる転炉用型銑。[Claims] 1 Having an uneven surface after pre-treatment of hot metal,
Pig iron cast into a shape with a single performance rate of 80% or less is charged into a batch type packed bed hot air heater, hot air is blown into the heater to preheat the pig iron, and the preheated pig iron is transferred to a converter. A method of operating a converter, which is characterized by charging the hot metal into a converter and refining it in a converter. 2. Pig iron for converter consisting of a single piece with an uneven surface and a shape with a single piece performance rate of 80% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26717088A JPH02115313A (en) | 1988-10-25 | 1988-10-25 | Operating method for converter and cast pig used therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26717088A JPH02115313A (en) | 1988-10-25 | 1988-10-25 | Operating method for converter and cast pig used therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02115313A JPH02115313A (en) | 1990-04-27 |
| JPH0480083B2 true JPH0480083B2 (en) | 1992-12-17 |
Family
ID=17441076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26717088A Granted JPH02115313A (en) | 1988-10-25 | 1988-10-25 | Operating method for converter and cast pig used therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02115313A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013133536A (en) * | 2011-12-27 | 2013-07-08 | Jfe Steel Corp | Method for producing molten steel |
-
1988
- 1988-10-25 JP JP26717088A patent/JPH02115313A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02115313A (en) | 1990-04-27 |
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