JPH0617497B2 - Method for producing pig iron for casting for melting cupola - Google Patents
Method for producing pig iron for casting for melting cupolaInfo
- Publication number
- JPH0617497B2 JPH0617497B2 JP26217887A JP26217887A JPH0617497B2 JP H0617497 B2 JPH0617497 B2 JP H0617497B2 JP 26217887 A JP26217887 A JP 26217887A JP 26217887 A JP26217887 A JP 26217887A JP H0617497 B2 JPH0617497 B2 JP H0617497B2
- Authority
- JP
- Japan
- Prior art keywords
- pig iron
- carbon
- casting
- amount
- cupola
- 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
- 229910000805 Pig iron Inorganic materials 0.000 title claims description 28
- 238000005266 casting Methods 0.000 title claims description 23
- 238000002844 melting Methods 0.000 title claims description 12
- 230000008018 melting Effects 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 48
- 229910052799 carbon Inorganic materials 0.000 claims description 48
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000009628 steelmaking Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 description 20
- 239000002184 metal Substances 0.000 description 20
- 229910001018 Cast iron Inorganic materials 0.000 description 8
- 239000000571 coke Substances 0.000 description 6
- 238000010079 rubber tapping Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000021258 carbohydrate absorption Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Landscapes
- 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、キュポラ溶解に使用する鋳物用銑鉄の製造方
法に関する。TECHNICAL FIELD The present invention relates to a method for producing pig iron for casting used for melting cupola.
（従来の技術） 従来、鋳物用銑鉄は溶鉱炉により溶製されているが、こ
の溶鉱炉により溶製される鋳物用銑鉄は炭素が過飽和に
なるまで吸収されるため炭素量が高いものとなってい
る。（鉄と炭素との平衡状態図によれば1150℃で 4.3％
の炭素が吸収されることになる。） このため、この高い炭素量の銑鉄を用いるキュポラ溶解
においては、この高い炭素量の銑鉄に加えて炭素量の少
ない鋼屑および／または古銑等の成分の異なる種々の原
料を配合して使用すると共に、さらに、キュポラ溶解の
操業条件であるコークス比（全追込コークス量／地金装
入量）を調整して、溶湯がコークスから吸収する炭素量
を調整し、所望の炭素量にした上で鋳鉄鋳物に供してい
る。(Prior Art) Conventionally, pig iron for casting is smelted in a blast furnace. However, pig iron for casting smelted in this blast furnace has a high carbon content because it is absorbed until carbon becomes supersaturated. . (According to the equilibrium diagram of iron and carbon, 4.3% at 1150 ℃
Will be absorbed. ) Therefore, in the cupola melting using this high carbon content pig iron, in addition to this high carbon content pig iron, various raw materials with different components such as steel scrap and / or old pig iron with low carbon content are used. In addition, the coke ratio (total amount of coke charge / metal charge), which is the operating condition for cupola melting, was adjusted to adjust the amount of carbon absorbed by the molten metal from the coke to obtain the desired amount of carbon. The above is for cast iron castings.
（発明が解決しようとする問題点） ところで、上述のキュポラ溶解における溶湯中の炭素量
を調整するための操業条件の調整は、原料の炭素量の
差、原料の溶融温度の差、キュポラ内での反応形態の
差、コークスからの吸炭量の差等を勘案して決められる
が、目標の炭素量を均一に得るには、相当の熟練と技術
とを必要とし、キュポラ溶解の生産性を阻害している。(Problems to be solved by the invention) By the way, adjustment of operating conditions for adjusting the amount of carbon in the molten metal in the above-mentioned cupola melting is performed by the difference in the amount of carbon in the raw material, the difference in the melting temperature of the raw material, and in the cupola. It can be determined by taking into consideration the difference in the reaction form of, the difference in the amount of carbon absorption from coke, etc., but in order to obtain the target carbon amount uniformly, considerable skill and skill are required, and the productivity of cupola dissolution is required. It is inhibiting.
そこで、本発明者等は、上記の問題点に鑑み、鋼屑を鋳
包み炭素量が揃えられた銑鉄を造り、いろいろ試行した
結果、炭素量が揃えられかつその量が鋳物製品の炭素量
に略近い銑鉄を用いてキュポラで溶解すると、出湯温度
の調整だけで出湯時の炭素量が容易に調整し得、所望の
炭素量の鋳物用溶湯が得られることを見出した。Therefore, in view of the above problems, the inventors of the present invention made a pig iron having a carbon amount that was cast-in with steel scrap and tried variously, and the carbon amount was aligned and the amount was the carbon amount of the casting product. It has been found that when the pig iron is melted in a cupola using substantially similar pig iron, the amount of carbon at the time of tapping can be easily adjusted only by adjusting the tapping temperature, and a molten metal for casting having a desired carbon amount can be obtained.
（問題点を解決するための手段） 本発明は、上記知見に基づきキュポラ溶解に相応しい鋳
物用銑鉄の製造方法を提供するもので、その要旨は、溶
鉱炉で溶製された鋳物用溶銑に、製鋼炉で溶製されかつ
前記鋳物用溶銑の炭素量に比較して低い炭素量に調整さ
れた溶鋼を混合してキュポラ溶解用鋳物用銑鉄を製造す
る方法であって、前記溶銑および溶鋼の混合割合を、両
者の把握された炭素量に基づき、混合後の溶銑の炭素量
が 2.0〜 3.6wt％になるように調整して混合する製造方
法である。(Means for Solving Problems) The present invention provides a method for producing a pig iron for casting that is suitable for cupola melting based on the above findings, and the gist thereof is to produce a hot metal for casting that is produced in a blast furnace, A method for producing a pig iron for cupola melting cast iron by mixing molten steel adjusted to a low carbon content compared to the carbon content of the casting hot metal in a furnace, and a mixing ratio of the molten pig iron and molten steel. Is a manufacturing method in which the amount of carbon in the hot metal after mixing is adjusted to 2.0 to 3.6 wt% based on the amounts of carbon grasped by both.
（作 用） 溶鉱炉で溶製された溶銑は、溶解過程での炭素量の調整
は難しく、炭素量が高いものになっている。一方、製鋼
炉で溶製された溶鋼は比較的炭素量の調整が容易である
と共に、低い炭素量に調整し得る。そして、このように
調整把握された炭素量を基に、炭素量の高い溶銑と炭素
量の低い溶鋼とを鋳鉄鋳物に求められる炭素量に略近い
2.0〜 3.6wt％の炭素量になるように混合割合を調整し
て混合することにより、両者は溶湯状態になっているの
で撹拌されて炭素量が偏ることなく均一に分散され、し
かも、炭素量が鋳鉄鋳物に求められる値に近い値（ 2.0
〜 3.6wt％）のキュポラ溶解用鋳物用銑鉄が製造し得る
ものである。(Operation) It is difficult to adjust the amount of carbon in the melting process of molten pig iron produced in a blast furnace, and the amount of carbon is high. On the other hand, the molten steel produced in the steelmaking furnace has a relatively easy adjustment of the carbon content, and can have a low carbon content. Then, based on the carbon amount thus adjusted and grasped, the hot metal having a high carbon amount and the molten steel having a low carbon amount are approximately close to the carbon amount required for the cast iron casting.
By adjusting the mixing ratio so that the amount of carbon is 2.0 to 3.6 wt% and mixing, the two are in a molten state, so they are agitated and evenly dispersed without uneven carbon amount. Is close to the value required for cast iron castings (2.0
~ 3.6wt%) of the cupola for casting pig iron for casting.
次に、溶銑を溶鋼との混合後の溶銑の炭素量を 2.0〜
3.6wt％に特定した理由について述べる。Next, the carbon content of the hot metal after mixing the hot metal with the molten steel is 2.0 to
The reason for specifying 3.6 wt% will be described.
炭素量 2.0〜 3.6wt％は、一般に汎用されている鋳鉄鋳
物の炭素量 2.5〜 3.9wt％より 0.3〜 0.5wt％低い範囲
の炭素量であり、従って、炭素量が 2.0〜 3.6wt％の溶
銑を固めて製造された鋳物用銑鉄であれば、キュポラで
再溶解する際 0.3〜 0.5wt％の若干の吸炭量の制御で、
しかも、コークス比を低くしても所望の炭素量のキュポ
ラで溶解された溶銑が得られるという利点を有するもの
で、炭素量が 2.0〜 3.6wt％の範囲外であっては、この
ような利点を享受し得ないためである。The carbon content of 2.0 to 3.6 wt% is a range of 0.3 to 0.5 wt% lower than the carbon content of generally used cast iron castings of 2.5 to 3.9 wt%, and therefore, the carbon content is 2.0 to 3.6 wt%. If it is a pig iron for casting that is manufactured by solidifying the
Moreover, even if the coke ratio is lowered, it has an advantage that hot metal dissolved in a cupola having a desired carbon amount can be obtained. If the carbon amount is out of the range of 2.0 to 3.6 wt%, such an advantage can be obtained. This is because they cannot enjoy.
尚、溶銑と溶鋼の混合の仕方については特定しないが、
溶鉱炉から出銑された湯道上の溶銑に溶鋼を注湯して混
合してもよく、または、溶銑を取鍋に取り、その取鍋内
の溶銑に溶鋼を注湯して混合してもよい。Although the method of mixing hot metal and molten steel is not specified,
Molten steel may be poured into and mixed with the hot metal on the runway tapped from the blast furnace, or the hot metal may be placed in a ladle and the hot metal in the ladle may be poured and mixed. .
また、ケイ素，マンガンの成分量調整は、Fe−Si，Fe−
Mn等を用いて常法により行い、その、投入時機は混合後
の溶銑に対し行ってもよい。In addition, the amount of silicon and manganese components can be adjusted by using Fe-Si, Fe-
It may be carried out by an ordinary method using Mn or the like, and the time of introduction may be carried out on the hot metal after mixing.
（実施例） 高炉で常法により溶製した第１表に示す成分の溶銑を電
気炉で常法により溶製した第１表に示す成分溶鋼とを準
備した。次いで、前記溶銑を高炉から出銑し、この出銑
された溶銑に対し、炭素量 3.3wt％， 3.6wt％の溶銑を
得べく、湯道上で溶鋼をそれぞれ5Ton，6Ton注湯し、そ
れぞれ合計15Ton の溶銑を取鍋に取った。これら取鍋に
受けた溶銑を鋳型に注湯し、単重５kgの銑鉄に造り、そ
の成分を調査した結果第２表に示すもので、略目標炭素
量のキュポラ溶解用鋳物用銑鉄が得られた。(Example) Molten pig iron having the components shown in Table 1 melted by a conventional method in a blast furnace was prepared by using an electric furnace, and molten steel having the components shown in Table 1 was prepared. Next, the hot metal was tapped from the blast furnace, and 5Ton and 6Ton of molten steel were poured on the runner respectively to obtain hot metal having a carbon content of 3.3wt% and 3.6wt%. 15Ton of hot metal was placed in a ladle. The hot metal received in these ladles was poured into a mold to make pig iron with a single weight of 5 kg, and the results were investigated as shown in Table 2. Table 1 shows that the target pig iron for cupola melting is pig iron. It was
上記得られた銑鉄の中 3.6wt％の銑鉄について、キュポ
ラ溶解した結果、図面に示すように出湯温度を調整する
だけで、炭素量 3.7合t％， 3.8wt％， 3.9wt％の鋳鉄
が製造し得、しかも、コークス比は10％で従来より２％
〜３％低いものであった。 Of the pig iron obtained above, about 3.6 wt% of pig iron was dissolved in cupola, and as a result, cast iron with a carbon content of 3.7 wt%, 3.8 wt%, 3.9 wt% was produced simply by adjusting the tapping temperature as shown in the drawing. Yes, and the coke ratio is 10%, which is 2% more than before.
~ 3% lower.
（発明の効果） 以上述べたように、本発明方法によれば、炭素量が鋳鉄
鋳物に求められる炭素量に略近い値に調整されたキュポ
ラ溶解用鋳物用銑鉄が製造でき、しかも、この方法によ
り得られた銑鉄を用いれば、キュポラ溶解時の炭素量の
調整が容易になることから、生産性が向上すると共に、
炭素量のバラツキの少ない鋳鉄鋳物が得られるという効
果がある。(Effects of the Invention) As described above, according to the method of the present invention, it is possible to manufacture a pig iron for cupola melting castings in which the amount of carbon is adjusted to a value substantially close to the amount of carbon required for cast iron castings, and moreover, this method By using the pig iron obtained by, it becomes easy to adjust the amount of carbon when the cupola is dissolved, so that the productivity is improved,
There is an effect that a cast iron casting with less variation in carbon amount can be obtained.
図は、キュポラ溶解された溶湯の出湯温度と出湯炭素量
（吸炭量）との関係を示す図である。The figure is a diagram showing the relationship between the tapping temperature of the melted cupola and the tapped carbon amount (carbohydrate absorption amount).
Claims (1)
で溶製されかつ前記鋳物用溶銑の炭素量に比較して低い
炭素量に調整された溶鋼を混合してキュポラ溶解用鋳物
用銑鉄を製造する方法であって、前記溶銑および溶鋼の
混合割合を、両者の把握された炭素量に基づき、混合後
の溶銑の炭素量が 2.0〜3.6wt ％になるように調整して
混合することを特徴とするキュポラ溶解用鋳物用銑鉄の
製造方法。1. A casting for melting cupola by mixing molten iron for casting, which has been melted in a blast furnace, with molten steel which has been melted in a steelmaking furnace and whose carbon content has been adjusted to be lower than the carbon content of the molten iron for casting. A method of producing pig iron for use, wherein the mixing ratio of the molten pig iron and molten steel is adjusted so that the carbon amount of the molten pig iron after mixing is 2.0 to 3.6 wt% based on the grasped carbon amount of both. A method for producing pig iron for casting for melting cupola, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26217887A JPH0617497B2 (en) | 1987-10-16 | 1987-10-16 | Method for producing pig iron for casting for melting cupola |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26217887A JPH0617497B2 (en) | 1987-10-16 | 1987-10-16 | Method for producing pig iron for casting for melting cupola |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01104710A JPH01104710A (en) | 1989-04-21 |
| JPH0617497B2 true JPH0617497B2 (en) | 1994-03-09 |
Family
ID=17372152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26217887A Expired - Lifetime JPH0617497B2 (en) | 1987-10-16 | 1987-10-16 | Method for producing pig iron for casting for melting cupola |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0617497B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109402326A (en) * | 2019-01-10 | 2019-03-01 | 东北大学 | A kind of LF furnace addition molten iron refinery practice |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110814304B (en) * | 2019-12-03 | 2023-06-16 | 西安瑞森金属复合材料有限公司 | Production method of vermicular cast iron |
-
1987
- 1987-10-16 JP JP26217887A patent/JPH0617497B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109402326A (en) * | 2019-01-10 | 2019-03-01 | 东北大学 | A kind of LF furnace addition molten iron refinery practice |
| CN109402326B (en) * | 2019-01-10 | 2020-05-12 | 东北大学 | Refining process for LF furnace added molten iron |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01104710A (en) | 1989-04-21 |
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