JPH07106425B2 - Manufacturing method of casting mold pig iron that hardly causes red rust - Google Patents
Manufacturing method of casting mold pig iron that hardly causes red rustInfo
- Publication number
- JPH07106425B2 JPH07106425B2 JP2067895A JP6789590A JPH07106425B2 JP H07106425 B2 JPH07106425 B2 JP H07106425B2 JP 2067895 A JP2067895 A JP 2067895A JP 6789590 A JP6789590 A JP 6789590A JP H07106425 B2 JPH07106425 B2 JP H07106425B2
- Authority
- JP
- Japan
- Prior art keywords
- pig iron
- mold
- casting
- pig
- red rust
- 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
Landscapes
- Mold Materials And Core Materials (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、銑鉄鋳物に用いる赤錆の発生しにくい鋳物用
銑鉄の製造方法に関するものである。TECHNICAL FIELD The present invention relates to a method for producing pig iron for casting, which is less likely to cause red rust and is used for pig iron castings.
（従来の技術） 溶鉱炉から出銑された鋳物溶銑鉄は、必要に応じて成分
調整され鋳鉄機工場で鋳銑機の鋳型に鋳込まれ型銑にさ
れる。鋳銑機工場では、第３図に示すように、鋳込んだ
銑鉄が鋳型３から離型し易いようにＣ、CaOを主成分と
する離型剤４を離型剤吹き付け装置５で鋳型内面に吹き
付けている。離型剤４を吹き付けた鋳型３に鋳込まれた
銑鉄は表面が凝固してから鋳銑機２上方の一次冷却装置
６からの水の噴射によって一次冷却される。さらに、離
型後の型銑（銑鉄）７は台車８上に山積みされ、再び二
次冷却装置９からの水の噴射によって二次冷却される。
二次冷却直後の銑鉄表面部には第６図に示すように、ほ
とんど被覆物は形成されていない。第６図（ａ）、
（ｂ）、（ｃ）、（ｄ）は銑鉄表面部の断面のEPMA写真
で、同図（ａ）は二次電子像写真、（ｂ）はＯ特製Ｘ線
像写真、（ｃ）はＣ特性Ｘ線像写真、（ｄ）はSi特性Ｘ
線像写真である。同図（ａ）から明らかなように、銑鉄
表面には酸化皮膜はほとんど認められない。このこと
は、同図（ｂ）でＯの特性Ｘ線像が薄いことからも明ら
かである。以上のように、銑鉄は鋳込みから冷却され型
銑になるまで、多くは表面に被覆物は形成されず赤錆の
発生を防ぐことはできない。(Prior Art) Cast iron hot metal that has been tapped from a blast furnace is adjusted in composition as necessary and cast into a mold of a pig iron machine at a cast iron machine factory to form a pig iron. In the pig iron factory, as shown in FIG. 3, the mold release agent spraying device 5 is used to release the mold release agent 4 containing C and CaO as the main components so that the cast pig iron can be easily released from the mold 3. Is spraying on. After the surface of the pig iron cast in the mold 3 sprayed with the mold release agent 4 is solidified, the primary cooling is performed by jetting water from the primary cooling device 6 above the casting pig machine 2. Further, the mold pig (pig iron) 7 after the mold release is piled up on the carriage 8 and is secondarily cooled again by the water injection from the secondary cooling device 9.
As shown in FIG. 6, almost no coating was formed on the surface of the pig iron immediately after the secondary cooling. FIG. 6 (a),
(B), (c) and (d) are EPMA photographs of the cross section of the pig iron surface, (a) is a secondary electron image photograph, (b) is an O special X-ray image photograph, and (c) is C. Characteristic X-ray image photograph, (d) Si characteristic X
It is a line image photograph. As is clear from FIG. 6A, almost no oxide film is observed on the pig iron surface. This is also clear from the fact that the characteristic X-ray image of O is thin in FIG. As described above, in most cases, pig iron cannot be prevented from forming red rust because no coating is formed on the surface from casting until it is cooled to form pig iron.
二次冷却後、型銑は屋外ヤードに移送され品種別に野積
みされ、また、鋳物工場においても、野積みの状態で貯
蔵される。この間、型銑は風雨にさらされ、酸化腐食さ
れ表面に赤錆が生じる。赤錆の主成分はFe2O3である
が、たいていはFe2O3・nH2Oの形で結晶水を含んでいる
のが一般的である。After the secondary cooling, the form iron is transferred to the outdoor yard and loaded in the open field according to the product type, and is also stored in the open condition at the foundry. During this time, the pig iron is exposed to wind and rain, and is oxidized and corroded, causing red rust on the surface. The main component of red rust is Fe 2 O 3 , but most of the time, it usually contains water of crystallization in the form of Fe 2 O 3 · nH 2 O.
（発明が解決しようとする課題） 銑鉄鋳物の溶製は電気炉やコークスを燃料としたキュポ
ラで行われるが、前記した表面に赤錆が発生した型銑を
使用する場合、以下のような問題点がある。(Problems to be Solved by the Invention) Although smelting of pig iron casting is performed in an electric furnace or a cupola using coke as a fuel, when using the pig iron having red rust on the surface, the following problems There is.
電気炉溶製時、特に誘導炉では溶湯中に直接型銑を投入
するため、赤錆鋳の結晶水が溶湯と激しく反応し、溶湯
を飛散させ非常に危険である。また、キュポラ溶製にお
いても、赤錆は還元コークスを浪費するとともにスラグ
発生、炉内の耐火物の消耗などの悪影響を及ぼし、ひい
ては溶銑性質の劣化、鋳造欠陥の発生にも繋がる。When the electric furnace is melted, especially in the induction furnace, the mold pig iron is directly charged into the molten metal, so that the crystal water of the red rust casting reacts violently with the molten metal and the molten metal is scattered, which is very dangerous. Also, in smelting cupola, red rust wastes reducing coke and adversely affects slag generation, consumption of refractory in the furnace, and the like, which leads to deterioration of molten pig iron properties and casting defects.
また、溶製前にショットブラストなどにより、赤錆を除
去する方法もあるが、この場合は、生産コストの上昇を
まねく。なお、赤錆の発生量は銑鉄重量の約0.5％であ
り、鉄源の損失でもある。There is also a method of removing red rust by shot blasting etc. before melting, but in this case, the production cost rises. The amount of red rust generated is about 0.5% of the weight of pig iron, which is also the loss of the iron source.
（課題を解決するための手段） 本発明は、鋳銑機で鋳込んだ銑鉄（型銑）の表面を皮膜
で被覆し、赤錆の発生を防止しようとするもので、その
第１発明は、鋳銑機による鋳物用型銑の製造に際し、鋳
込まれた鋳物銑を一次冷却し、その後、離型された型銑
をミストまたは水蒸気で、冷却終了温度が700℃以上に
なるよう冷却することによって、型銑表皮にマグネタイ
ト（Fe3O4）の皮膜を形成する赤錆の発生しにくい鋳物
用型銑の製造方法である。(Means for Solving the Problems) The present invention is intended to prevent the occurrence of red rust by coating the surface of pig iron (mold pig) cast by a pig iron machine with a film, and the first invention thereof is When manufacturing casting pig iron with a pig iron machine, first cool the cast pig iron that has been cast, and then cool the released casting pig iron with mist or steam to a cooling end temperature of 700 ° C or higher. According to the method, a method for producing a casting pig iron for forming a film of magnetite (Fe 3 O 4 ) on the die pig skin, which hardly causes red rust, is obtained.
第２発明は、鋳銑機による鋳物用型銑の製造に際し、鋳
型内面にFeOとSiO2を主成分とするスラグ皮膜剤を施
し、鋳銑時に鋳物銑の熱で前記スラグ皮膜剤を溶融し
て、型銑表面にスラグ皮膜（Fe2SiO4）を形成する赤錆
の発生しにくい鋳物用型銑の製造方法である。The second aspect of the invention is, in the production of casting pig iron by a pig iron machine, applying a slag coating agent containing FeO and SiO 2 as main components on the inner surface of the mold, and melting the slag coating agent by the heat of the casting pig iron during casting pig iron. And a method for producing a casting mold pig iron that forms a slag film (Fe 2 SiO 4 ) on the surface of the mold pig iron and is unlikely to cause red rust.
（作用） 以下、本発明の作用について説明する。(Operation) Hereinafter, the operation of the present invention will be described.
第１発明は、第１図に示すように、溶鉱炉から出銑され
た溶銑１を、鋳銑機２の鋳型内面に離型剤４を離型剤吹
き付け装置５で吹き付けた鋳型３に鋳込み、鋳銑機上方
の一次冷却装置６により、型銑が鋳型から離型しやすい
温度まで冷却し、鋳型から離型した型銑７を台車８上に
山積みし、この型銑７を耐火物フード11で覆い、型銑７
の保有する熱量を活用して、高温に保持し、この状態で
ミストまたは水蒸気冷却装置12で長時間かけて冷却し、
型銑表面にマグネタイト（Fe3O4）の皮膜を形成させる
ものである。マグネタイトは黒錆として知られており、
不動態を形成し赤錆の発生を防ぐ効果がある。従来技術
では、前記したように一次冷却後も冷却のみを目的とし
た二次冷却を行っていた。As shown in FIG. 1, the first invention casts the hot metal 1 tapped from the blast furnace into a mold 3 in which a mold release agent 4 is sprayed with a mold release agent spraying device 5 on the inner surface of the mold of a cast iron machine 2. The primary cooling device 6 above the casting pig iron cools the mold pig to a temperature at which the mold is easily released from the mold, and the mold pig 7 released from the mold is piled up on the carriage 8, and the mold pig 7 is filled with the refractory hood 11. Cover with, pig iron 7
Utilizing the amount of heat held by, keep it at a high temperature, and in this state cool it with a mist or steam cooling device 12 for a long time,
A film of magnetite (Fe 3 O 4 ) is formed on the surface of the mold pig iron. Magnetite is known as black rust,
It has the effect of forming a passive state and preventing the formation of red rust. In the prior art, as described above, the secondary cooling was performed only for cooling after the primary cooling.
ミストまたは水蒸気冷却の開始温度は、型銑が鋳型から
離型しやすい温度で決まり、冷却終了温度は、赤錆防止
に必要なマグネタイト厚さを確保するための温度で決ま
る。赤錆防止には、厚さ20μｍ以上のマグネタイトの形
成が好ましく、このためには、冷却終了温度は、700℃
以上とする。The mist or steam cooling start temperature is determined by the temperature at which the mold pig is easily released from the mold, and the cooling end temperature is determined by the temperature for securing the magnetite thickness necessary for preventing red rust. To prevent red rust, it is preferable to form magnetite with a thickness of 20 μm or more. For this purpose, the cooling end temperature is 700 ° C.
That is all.
冷却にミストまたは水蒸気を用いる理由は、下記の反応
式に示すように、水蒸気によってマグネタイトの形成が
促進されるためである。また、ミストは水蒸気分圧を上
げる目的で用いる。The reason for using mist or water vapor for cooling is that water vapor promotes the formation of magnetite, as shown in the following reaction formula. The mist is used for the purpose of increasing the partial pressure of water vapor.
3Fe＋4H2O→Fe3O4＋4H2 第２発明は、第２図に示すように、溶鉱炉から出銑され
た溶銑１を、鋳銑機２の鋳型内面に離型剤４を離型剤吹
き付け装置５で吹き付けたのち、スラグ皮膜剤21をスラ
グ皮膜剤吹き付け装置22で吹き付けた鋳型３に鋳込み、
吹き付けられたスラグ皮膜剤は鋳込まれた溶銑の熱によ
って溶解し、鋳型内の溶銑の表面を被覆するものであ
る。なお、スラグ皮膜剤の吹き付けは、刷毛等による塗
布に替えることも可能であり、また、スラグ皮膜剤は溶
銑１を鋳型３に鋳込んだのち、一次冷却前に補足的に追
加することも可能である。3Fe + 4H 2 O → Fe 3 O 4 + 4H 2 The second invention is, as shown in FIG. 2, spraying the release agent 4 onto the inner surface of the mold of the pig iron machine 2 with the hot metal 1 tapped from the blast furnace. After spraying with the device 5, the slag coating agent 21 is cast into the mold 3 sprayed with the slag coating agent spraying device 22,
The sprayed slag coating agent is melted by the heat of the cast hot metal and covers the surface of the hot metal in the mold. The spraying of the slag coating agent can be replaced by application with a brush or the like, and the slag coating agent can be additionally added after the hot metal 1 is cast into the mold 3 and before the primary cooling. Is.
このようにして形成したクラグ皮膜が型銑（銑鉄）を大
気中の酸素および水分から隔離し、型銑表面に発生する
赤錆を防ぐ。The crag film formed in this way isolates the pig iron (pig iron) from oxygen and moisture in the atmosphere, and prevents red rust generated on the surface of the pig iron.
スラグ皮膜剤の主成分はFeO、SiO2で、型銑表面にファ
イヤライト（Fe2SiO4）層を形成する。ファイヤライト
皮膜はガラス質の緻密な層であるため、落下衝撃による
型銑からの剥離はない。赤錆防止の点からファイヤライ
ト皮膜は厚さ40μｍ以上が好ましい。The main components of the slag coating agent are FeO and SiO 2 , and a firelite (Fe 2 SiO 4 ) layer is formed on the surface of the mold pig iron. Since the firelite coating is a glassy and dense layer, it does not peel off from the die pig due to a drop impact. From the viewpoint of preventing red rust, the firelite film preferably has a thickness of 40 μm or more.
なお、鋳型に鋳込まれた溶銑は、従来技術と同じように
鋳銑機２上方の一次冷却装置６からの水の噴射によって
一次冷却される。さらに、離型後の型銑７は台車８上に
山積みされ、再び二次冷却装置９からの水の噴射によっ
て二次冷却される。The hot metal cast in the mold is primarily cooled by jetting water from the primary cooling device 6 above the casting pig machine 2 as in the prior art. Further, the mold iron 7 after the mold release is piled up on the carriage 8 and is secondarily cooled again by the water injection from the secondary cooling device 9.
（実施例） 以下に本発明の実施例について説明する。(Examples) Examples of the present invention will be described below.
実施例１ 溶鉱炉から出銑された溶銑を、離型剤の塗られた鋳銑機
の鋳型に鋳込み、鋳銑機上方の一次冷却装置により、型
銑が鋳型から離型しやすい温度まで冷却した。その後、
鋳型から離型した型銑（銑鉄）を台車上に山積みし、耐
火物フードで覆い、900〜700℃の温度範囲に保持した。
この間、耐火物フードの上部から少量の水蒸気を30分間
型銑に吹き付け、型銑表面にマグネタイト（Fe3O4）の
皮膜を形成させた。型銑表面に形成したマグネタイト
（Fe3O4）皮膜の状態を第４図に示す。Example 1 The hot metal tapped from the blast furnace was cast into a mold of a cast iron machine coated with a release agent, and cooled by a primary cooling device above the cast iron machine to a temperature at which the mold pig was easily released from the mold. . afterwards,
The pig iron (pig iron) released from the mold was piled up on a trolley, covered with a refractory hood, and kept in a temperature range of 900 to 700 ° C.
During this period, a small amount of water vapor was blown onto the mold pig iron from the upper part of the refractory hood for 30 minutes to form a film of magnetite (Fe 3 O 4 ) on the surface of the mold pig iron. Fig. 4 shows the state of the magnetite (Fe 3 O 4 ) film formed on the surface of the mold pig iron.
第４図（ａ）、（ｂ）、（ｃ）、（ｄ）は第１発明の銑
鉄表面部の断面のEPMA写真で、同図（ａ）は二次電子像
写真、（ｂ）はＯ特性Ｘ線像写真、（ｃ）はＣ特性Ｘ線
像写真、（ｄ）はSi特性Ｘ線像写真である。4 (a), (b), (c), and (d) are EPMA photographs of the cross section of the pig iron surface portion of the first invention, FIG. 4 (a) is a secondary electron image photograph, and (b) is O. A characteristic X-ray image photograph, (c) is a C characteristic X-ray image photograph, and (d) is a Si characteristic X-ray image photograph.
同図（ａ）から明らかなように、型銑表面には厚さ20μ
ｍ以上のマグネタイト皮膜が形成されていることが認め
られる。このことは、同図（ｂ）でＯの特性Ｘ線像が濃
いことからも明らかである。As is clear from Fig. 1 (a), the thickness of the mold pig iron surface is 20μ.
It is recognized that a magnetite film of m or more is formed. This is also apparent from the fact that the characteristic X-ray image of O is dark in FIG.
実施例２ 溶鉱炉から出銑された溶銑を、鋳銑機の鋳型内面に離型
剤を吹き付けたのち、スラグ皮膜剤を吹き付けた鋳型に
鋳込み、鋳込まれた溶銑の熱によってスラグ皮膜剤を溶
解し、鋳型内の溶銑の表面を被覆させた。実施例に用い
たスラグ皮膜剤はスケールと珪砂を7:3の割合で混合し
たもので、融点は1100〜1200℃である。なお、この場合
の溶銑温度は1370〜1400℃の範囲であった。Example 2 The hot metal tapped from the blast furnace was sprayed with a mold release agent on the inner surface of the mold of the cast iron machine, and then cast into a mold sprayed with the slag coating agent, and the slag coating agent was melted by the heat of the cast hot metal. Then, the surface of the hot metal in the mold was covered. The slag coating agent used in the examples is a mixture of scale and silica sand in a ratio of 7: 3, and has a melting point of 1100 to 1200 ° C. The hot metal temperature in this case was in the range of 1370 to 1400 ° C.
スラグ皮膜で被覆された溶銑は、従来技術と同じように
鋳銑機上方の一次冷却装置からの水の噴射によって一次
冷却される。さらに、離型後の型銑（銑鉄）は台車上に
山積みされ、再び二次冷却装置からの水の噴射によって
二次冷却される。このようにして得られた型銑表面のス
ラグ皮膜（ファイヤライト層）の状態を第５図に示す。The hot metal coated with the slag film is primarily cooled by jetting water from the primary cooling device above the casting iron machine as in the prior art. Further, the released mold pig iron (pig iron) is piled up on the trolley, and is secondarily cooled again by jetting water from the secondary cooling device. The state of the slag coating (firelite layer) on the surface of the die pig obtained in this way is shown in FIG.
第５図（ａ）、（ｂ）、（ｃ）、（ｄ）は第２発明の銑
鉄表面部の断面のEPMA写真で、同図（ａ）は二次電子像
写真、（ｂ）はＯ特性Ｘ線像写真、（ｃ）はＣ特性Ｘ線
像写真、（ｄ）はSi特性Ｘ線像写真である。5 (a), (b), (c), and (d) are EPMA photographs of the cross section of the pig iron surface portion of the second invention, FIG. 5 (a) is a secondary electron image photograph, and (b) is O. A characteristic X-ray image photograph, (c) is a C characteristic X-ray image photograph, and (d) is a Si characteristic X-ray image photograph.
同図（ａ）から明らかなように、型銑表面には厚さは40
μｍ以上のファイヤライト（Fe2SiO4）層が形成されて
いることが認められる。このことは、同図（ｂ）のＯ特
性Ｘ線像、（ｄ）のSi特性Ｘ線像が濃いことからも明ら
かである。すなわち、型銑表面のスラグ皮膜は、Fe、
Ｏ、Siからなるファイヤライト（Fe2SiO4）層で形成さ
れていることがわかる。As is clear from Fig. 1 (a), the thickness of the die pig iron surface is 40
It is recognized that a firelite (Fe 2 SiO 4 ) layer having a thickness of μm or more is formed. This is also clear from the fact that the O-characteristic X-ray image in (b) and the Si-characteristic X-ray image in (d) are dark. That is, the slag coating on the surface of the mold pig is Fe,
It can be seen that it is formed of a firelite (Fe 2 SiO 4 ) layer composed of O and Si.
（発明の効果） 以上説明したように、本発明は型銑（銑鉄）の表面に不
動態のマグネタイト皮膜またはスラグ皮膜を形成させる
ため、野積みの状態で長時間貯蔵しても型銑の表面に赤
錆が発生することはない。このため、溶解時の赤錆中の
結晶水の溶湯との反応による溶湯の飛散、還元コークス
の浪費、赤錆によるスラグ発生、炉内の耐火物の消耗な
どの悪影響が解消され、さらに、溶湯性質の向上、鋳造
欠陥の防止、鉄源の有効利用が図られる。(Effects of the Invention) As described above, the present invention forms a passive magnetite film or slag film on the surface of mold pig iron (pig iron), so that the surface of mold pig iron can be stored even in the open-stacked state for a long time. No red rust occurs on the. Therefore, adverse effects such as scattering of molten metal due to reaction with crystal water in red rust during melting, waste of reducing coke, slag generation due to red rust, exhaustion of refractory in the furnace, etc. are further eliminated, and further Improvement, prevention of casting defects, and effective utilization of iron source.
第１図は第１発明の工程概要を、第２図は第２発明の工
程概要を、第３図は従来技術の工程概要をそれぞれ示す
図である。 第４図（ａ）、（ｂ）、（ｃ）、（ｄ）は第１発明の銑
鉄表面部の断面のEPMA写真で、同図（ａ）は二次電子像
写真、（ｂ）はＯ特性Ｘ線像写真、（ｃ）はＣ特性Ｘ線
像写真、（ｄ）はSi特性Ｘ線像写真である。 第５図（ａ）、（ｂ）、（ｃ）、（ｄ）は第２発明の銑
鉄表面部の断面のEPMA写真で、同図（ａ）は二次電子像
写真、（ｂ）はＯ特性Ｘ線像写真、（ｃ）はＣ特性Ｘ線
像写真、（ｄ）はSi特性Ｘ線像写真である。 第６図（ａ）、（ｂ）、（ｃ）、（ｄ）は従来技術の銑
鉄表面部の断面のEPMA写真で、同図（ａ）は二次電子像
写真、（ｂ）はＯ特性Ｘ線像写真、（ｃ）はＣ特性Ｘ線
像写真、（ｄ）はSi特性Ｘ線像写真である。 １……溶銑、２……鋳銑機、３……鋳型、４……離型
剤、５……離型剤吹き付け装置、６……一次冷却装置、
７……型銑、８……台車、９……二次冷却装置、11……
耐火物フード、12……ミストまたは水蒸気冷却装置、21
……スラグ皮膜剤、22……スラグ皮膜剤吹き付け装置。FIG. 1 is a diagram showing a process outline of the first invention, FIG. 2 is a diagram showing a process outline of the second invention, and FIG. 3 is a diagram showing a process outline of a conventional technique. 4 (a), (b), (c), and (d) are EPMA photographs of the cross section of the pig iron surface portion of the first invention, FIG. 4 (a) is a secondary electron image photograph, and (b) is O. A characteristic X-ray image photograph, (c) is a C characteristic X-ray image photograph, and (d) is a Si characteristic X-ray image photograph. 5 (a), (b), (c), and (d) are EPMA photographs of the cross section of the pig iron surface portion of the second invention, FIG. 5 (a) is a secondary electron image photograph, and (b) is O. A characteristic X-ray image photograph, (c) is a C characteristic X-ray image photograph, and (d) is a Si characteristic X-ray image photograph. 6 (a), (b), (c), and (d) are EPMA photographs of a cross-section of the conventional pig iron surface, FIG. 6 (a) is a secondary electron image photograph, and (b) is an O characteristic. X-ray image photograph, (c) C characteristic X-ray image photograph, (d) Si characteristic X-ray image photograph. 1 ... hot metal, 2 ... casting iron machine, 3 ... mold, 4 ... release agent, 5 ... release agent spraying device, 6 ... primary cooling device,
7 …… Type pig, 8 …… Truck, 9 …… Secondary cooling device, 11 ……
Refractory hood, 12 ... Mist or steam cooler, 21
…… Slag coating agent, 22 …… Slag coating agent spraying device.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 田中 孝三 兵庫県三木市志染町東自由が丘３―463 (72)発明者 福島 章 兵庫県神戸市東灘区深江南町３―５―14 (72)発明者 福田 勝 兵庫県西宮市甲陽園本庄町４―35 (72)発明者 谷口 浩平 兵庫県明石市中崎１丁目１―１―413号 (56)参考文献 特開 昭61−159245（ＪＰ，Ａ) 特開 昭55−36042（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kozo Tanaka 3-463 Higashijiyugaoka, Shizen-cho, Miki-shi, Hyogo (72) Inventor Akira Fukushima 3-5-14 Fukae-minami-cho, Higashinada-ku, Kobe-shi, Hyogo (72) Fukuda, inventor Katsuyoen, Nishinomiya-shi, Hyogo 4-35, Honjo-cho (72) Inventor Kohei Taniguchi 1-1-1, Nakazaki, Akashi-shi, Hyogo (56) Reference JP-A 61-159245 (JP, A) Sho 55-36042 (JP, A)
Claims (2)
込まれた鋳物銑を一次冷却し、その後、離型された型銑
をミストまたは水蒸気で、冷却終了温度が700℃以上に
なるよう冷却することによって、型銑表皮にマグネタイ
ト（Fe3O4）の皮膜を形成することを特徴とする赤錆の
発生しにくい鋳物用型銑の製造方法。1. A method of producing a casting mold pig iron using a pig iron machine, in which the cast pig iron cast is first cooled, and then the released mold pig iron is cooled with mist or steam to a cooling end temperature of 700 ° C. or more. A method for producing a casting die for casting that is resistant to red rust, characterized in that a film of magnetite (Fe 3 O 4 ) is formed on the surface of the die pig by cooling so.
型内面にFeOとSiO2を主成分とするスラグ皮膜剤を施
し、鋳銑時に鋳物銑の熱で前記スラグ皮膜剤を溶融し
て、型銑表面にスラグ皮膜（Fe2SiO4）を形成すること
を特徴とする赤錆の発生しにくい鋳物用型銑の製造方
法。2. A slag coating agent containing FeO and SiO 2 as a main component is applied to the inner surface of the mold when the casting pig iron is produced by a pig iron machine, and the slag coating agent is melted by the heat of the casting pig iron during casting. And a slag film (Fe 2 SiO 4 ) is formed on the surface of the die pig iron, to thereby produce a die pig iron for casting which hardly causes red rust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2067895A JPH07106425B2 (en) | 1990-03-16 | 1990-03-16 | Manufacturing method of casting mold pig iron that hardly causes red rust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2067895A JPH07106425B2 (en) | 1990-03-16 | 1990-03-16 | Manufacturing method of casting mold pig iron that hardly causes red rust |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03268842A JPH03268842A (en) | 1991-11-29 |
| JPH07106425B2 true JPH07106425B2 (en) | 1995-11-15 |
Family
ID=13358090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2067895A Expired - Lifetime JPH07106425B2 (en) | 1990-03-16 | 1990-03-16 | Manufacturing method of casting mold pig iron that hardly causes red rust |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07106425B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE260723T1 (en) * | 1999-08-18 | 2004-03-15 | Sug Schmelz Und Giessanlagen G | METHOD AND DEVICE FOR PRODUCING PREFERABLY ONE-PIECE ALLOY BODY FROM LIQUID METAL |
| AU2006340901A1 (en) | 2006-03-24 | 2007-10-04 | Mesabi Nugget Llc | Granulated metallic iron superior in rust resistance and method for producing the same |
| CN108127097A (en) * | 2018-01-13 | 2018-06-08 | 合肥市瑞宏重型机械有限公司 | A kind of pedestal internal densener device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5536042A (en) * | 1978-09-07 | 1980-03-13 | Nippon Kokan Kk <Nkk> | Casting method for low-carbon ferrochrome ingot |
| JPS61159245A (en) * | 1984-12-29 | 1986-07-18 | Nippon Steel Corp | Production of casting pig |
-
1990
- 1990-03-16 JP JP2067895A patent/JPH07106425B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03268842A (en) | 1991-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2448361A1 (en) | Method for producing metallic iron | |
| CN105598389B (en) | A kind of casting technique for the composite flange for sealing rain-proof | |
| JPH07106425B2 (en) | Manufacturing method of casting mold pig iron that hardly causes red rust | |
| KR101028437B1 (en) | Products for continuous casting mold protection of cast iron pipes | |
| CN111424134B (en) | Production method of iron-chromium-aluminum alloy continuous casting slab | |
| CN110280711B (en) | Method for producing precision casting high-performance ductile iron by using low-carbon steel scrap | |
| CN1088268A (en) | Process for recovering magnesium from magnesium slag | |
| JP4576657B2 (en) | Steel continuous casting method | |
| US3470937A (en) | Process of protecting castings made of carbon-containing alloys against decarburization at the edges and against surface defects | |
| CN116043099A (en) | Ultra-low temperature nodular cast iron for rail transit and its production process | |
| JPH0533028A (en) | Method for producing pig iron for high-purity casting | |
| CN118600149B (en) | A method for producing small-section aluminum-containing square billet by slag washing and direct-lifting technology | |
| JP2795527B2 (en) | Cast iron manufacturing method | |
| CN111230054A (en) | The method of cleaning the sticky slag at the bottom of the ladle | |
| JPS625213B2 (en) | ||
| JPS5952014B2 (en) | Continuous casting method for medium-coal range steel slabs | |
| JPH0428782B2 (en) | ||
| JPH03294055A (en) | Die casting method using core | |
| JPH03114624A (en) | Core for forming receiving mouth of cast iron pipe | |
| JP4276362B2 (en) | Manufacturing method of casting mold | |
| JP2561527B2 (en) | Die casting method for spheroidal graphite cast iron casting | |
| JPH0871703A (en) | Method for preventing red rust on casting pig iron | |
| SU623639A1 (en) | Method of applying protective coating onto pattern | |
| JPH10314921A (en) | Cooling pipe cast-in casting steel product and its manufacture | |
| JPH09202914A (en) | Vacuum refining vessel refractory repair method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081115 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20081115 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091115 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20091115 Year of fee payment: 14 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101115 Year of fee payment: 15 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101115 Year of fee payment: 15 |