JPH01136919A - Production of spheroidal graphite cast iron - Google Patents
Production of spheroidal graphite cast ironInfo
- Publication number
- JPH01136919A JPH01136919A JP29381587A JP29381587A JPH01136919A JP H01136919 A JPH01136919 A JP H01136919A JP 29381587 A JP29381587 A JP 29381587A JP 29381587 A JP29381587 A JP 29381587A JP H01136919 A JPH01136919 A JP H01136919A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- spheroidal graphite
- graphite cast
- ladle
- molten 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.)
- Pending
Links
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 26
- 239000010439 graphite Substances 0.000 claims abstract description 26
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 238000011081 inoculation Methods 0.000 claims abstract description 10
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 10
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 229910000676 Si alloy Inorganic materials 0.000 claims abstract description 4
- 229910001339 C alloy Inorganic materials 0.000 claims abstract 3
- 239000000463 material Substances 0.000 claims abstract 2
- 239000002184 metal Substances 0.000 claims description 39
- 229910052751 metal Inorganic materials 0.000 claims description 39
- 238000005087 graphitization Methods 0.000 claims description 15
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical group [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- 239000005997 Calcium carbide Substances 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical group CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 21
- 238000005266 casting Methods 0.000 abstract description 17
- 229910052742 iron Inorganic materials 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 229910052797 bismuth Inorganic materials 0.000 abstract description 7
- 239000006025 fining agent Substances 0.000 abstract 3
- 229910003465 moissanite Inorganic materials 0.000 abstract 3
- 229910001018 Cast iron Inorganic materials 0.000 abstract 2
- 239000002245 particle Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 239000002054 inoculum Substances 0.000 description 5
- 229910001567 cementite Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 229910014813 CaC2 Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 229910007981 Si-Mg Inorganic materials 0.000 description 1
- 229910008316 Si—Mg Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は薄肉鋳物を製造するのに適した黒鉛化能に優れ
た球状黒鉛鋳鉄の製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing spheroidal graphite cast iron with excellent graphitization ability and suitable for producing thin-walled castings.
〔従来の技術及び発明が解決しようとする問題点〕球状
黒鉛鋳鉄を製造する際、工業的に最も多く使用されてい
る球状化剤は通常Ｆｅ−５１−Ｍｇ合金又はこれに少量
のＲＥを含有せしめた合金である。[Prior art and problems to be solved by the invention] When producing spheroidal graphite cast iron, the spheroidizing agent most commonly used industrially is usually Fe-51-Mg alloy or it containing a small amount of RE. It is a special alloy.
また球状化処理法としては開放取鍋添加法、いわゆる置
注ぎサンドイツチ法が一般に広く用いられている。As a spheroidization treatment method, an open ladle addition method, the so-called pour-in-place sandwich method, is generally widely used.
この球状化処理の後、ＭｇまたはＭｇおよびＲＥを含有
したことにより低下した溶湯の黒鉛化能を向上させる為
に、一般には各種Ｓｉ合金系又は黒鉛系の接種剤を取鍋
中及び／又は注湯流へ接種して鋳物を製造する。After this spheroidization treatment, various Si alloy-based or graphite-based inoculants are generally used in the ladle and/or injected in order to improve the graphitization ability of the molten metal, which has decreased due to the inclusion of Mg or Mg and RE. Castings are manufactured by inoculating a hot metal stream.
しかし、工業的には球状化処理後に行なう接種のみでは
薄肉鋳物に於ける一次セメンタイトの発生を完全には防
止できないため通常−次セメンタイトを分解するための
熱処理が必要とされている。However, industrially, inoculation performed after spheroidization treatment alone cannot completely prevent the generation of primary cementite in thin-walled castings, and therefore heat treatment is required to decompose the primary cementite.
従って製造原価の高騰、工程期間の増大など好ましから
ざる結果を招くことになる。This results in undesirable results such as a rise in manufacturing costs and an increase in process time.
そこで本発明者等が先に出願した球状黒鉛鋳鉄の製造方
法（特願昭６１−１４４５９１号）は、薄肉鋳物に対し
て優れたチル防止効果を有するが本発明は特願昭６１−
１４４５９１号に黒鉛微細化剤としてビスマス（以下単
にＢｉと記す）を添加してさらに効果をあげようとする
ものである。Therefore, the method for manufacturing spheroidal graphite cast iron (Japanese Patent Application No. 61-144591), which the present inventors previously filed, has an excellent chill prevention effect on thin-walled castings.
Bismuth (hereinafter simply referred to as Bi) is added to No. 144591 as a graphite refiner to further improve the effect.
Ｂｉ添加が黒鉛微細化に対し効果があることは既に文献
、例えば、Ａ Ｆ Ｓ Ｉｎｔｅｒｎａｔ、Ｃａ５ｔ
Ｍｅｔａｌｓ、Ｊ、７（１９８２）Ｎｒ、３．Ｓ、２２
／３１及びＦＯＮＤＥＲＩＥ ＢＥＬＧＥ５２（１９８
２）Ｎｒ、２．Ｓ、５／１８にも発表されており、また
Ｂｉを含有する接種剤、例えば５ＰＨＥＲＩＸ（商品名
）も市販されている。It is already known in the literature that the addition of Bi is effective for graphite refinement, such as AF S International, Ca5t
Metals, J., 7 (1982) Nr, 3. S, 22
/31 and FONDERIE BELGE52 (198
2) Nr, 2. S, 5/18, and Bi-containing inoculants, such as 5PHERIX (trade name), are also commercially available.
しかし、本発明はＳＩＣを主体とする黒鉛化促進剤又は
ＣａＣ２を主体とする黒鉛化促進剤による溶湯処理とＢ
ｉ添加の相乗効果により特に薄肉鋳物に要求される黒鉛
化促進効果と黒鉛粒数増大効果を大幅に向上せしめるも
ので、例えば特願昭６１−１４４５９１号の球状黒鉛鋳
鉄の製造方法を適用した場合の黒鉛粒数は３００ケ／ｍ
ｍ２（但し肉厚２５ｍｍのＹブロックを鋳造し黒鉛粒径
８μｍ以上）、またＢｉ添加のみでも黒鉛粒数は３００
ケ／ｍｍ２（但し肉厚２５ｍｍのＹブロックを鋳造し黒
鉛粒径８μｍ以上）程度であるが。However, the present invention deals with molten metal treatment using a graphitization accelerator mainly composed of SIC or a graphitization accelerator mainly composed of CaC2, and B.
The synergistic effect of i addition greatly improves the graphitization promotion effect and the graphite particle number increase effect, which are especially required for thin-walled castings. For example, when the manufacturing method of spheroidal graphite cast iron of Japanese Patent Application No. 144591/1980 is applied. The number of graphite particles is 300 particles/m
m2 (however, a Y block with a wall thickness of 25 mm is cast and the graphite grain size is 8 μm or more), and even with the addition of Bi, the number of graphite grains is 300.
However, the graphite particle size is about 8 μm or more when a Y block with a wall thickness of 25 mm is cast.
本発明では６００ケ／ｍｍ”（但し肉厚２５ｍｍのＹブ
ロックを鋳造し黒鉛粒径８μｍ以上）と増大する。In the present invention, it increases to 600 particles/mm'' (However, when a Y block with a wall thickness of 25 mm is cast, the graphite particle size is 8 μm or more).
このように、本発明の目的は、薄肉鋳物に対して一次セ
メンタイトの発生を防止し鋳放し状態で充分な変形能を
有する球状黒鉛鋳鉄の製造法を提供するものである。Thus, an object of the present invention is to provide a method for producing spheroidal graphite cast iron that prevents the formation of primary cementite in thin-walled castings and has sufficient deformability in the as-cast state.
本発明の球状黒鉛鋳鉄の製造法は、球状黒鉛鋳鉄を製造
する際に１球状化剤と黒鉛化促進剤および黒鉛微細化剤
とを取鍋内に装填し、該取鍋内に球状黒鉛鋳鉄となる組
成の溶湯を注入して球状化処理を行ない、その後溶湯が
鋳型内の製品空隙部に流入する迄の間に接種を行なうこ
とを特徴とするものである。The manufacturing method of spheroidal graphite cast iron of the present invention is such that when manufacturing spheroidal graphite cast iron, a spheroidizing agent, a graphitization accelerator, and a graphite refining agent are loaded into a ladle, and the spheroidal graphite cast iron is loaded into a ladle. This method is characterized by injecting a molten metal having the following composition and performing a spheroidizing treatment, and then performing inoculation before the molten metal flows into the product cavity in the mold.
以下本発明の実施例をさらに詳細に説明する。Examples of the present invention will be described in more detail below.
〔実施例、１〕
１）取鍋内に装入する球状黒鉛鋳鉄となる組成の溶湯重
量に対して球状化剤としてＦｅ−３Ｆｅ−３ｉ、５）を
１．６％、また黒鉛化促進剤として炭化珪素を１．０％
、Ｆａ−８ｉを０．５％、また黒鉛微細化剤として金Ｂ
Ｂｉを０．０１０％取鍋の底に装填した。[Example 1] 1) 1.6% of Fe-3Fe-3i, 5) as a spheroidizing agent, and a graphitization accelerator based on the weight of the molten metal charged into a ladle and having a composition that will become spheroidal graphite cast iron. silicon carbide as 1.0%
, 0.5% Fa-8i, and gold B as a graphite refiner.
0.010% Bi was loaded at the bottom of the ladle.
２）ついで球状黒鉛鋳鉄となる組成の溶湯を取鍋に装入
した。この時の溶湯の温度は１，５２０℃であった。2) Next, the molten metal having the composition of spheroidal graphite cast iron was charged into the ladle. The temperature of the molten metal at this time was 1,520°C.
３）上記処理によって得た溶湯は、鉄と不可避的不純物
と数表に示す化学成分であった。3) The molten metal obtained by the above treatment contained iron, inevitable impurities, and the chemical components shown in the table.
（ｗｔ％）
４） この溶湯を用いて第１図に示す階段状の試験片を
作成した。試験片鋳込みのときＦｅ−５ｉでＳｉ当量０
．１％を注湯流中に接種した。この時の注入温度は１，
４００℃であった。(wt%) 4) Using this molten metal, a stepped test piece shown in FIG. 1 was prepared. Si equivalent is 0 with Fe-5i when casting the test piece.
．． 1% was inoculated into the pouring water. The injection temperature at this time is 1,
The temperature was 400°C.
５）試験片の肉厚２ｍｍの部分の顕微鏡組織は第２図に
示すように、微細かつ多数の黒鉛が晶出し、チルの発生
は全く認められず、きわめて良好な球状黒鉛組織となっ
ている。5) As shown in Figure 2, the microscopic structure of the 2 mm thick part of the test piece shows that a large number of fine graphite crystals were crystallized, and no chill was observed, resulting in an extremely good spheroidal graphite structure. .
〔実施例、２〕
１）取鍋内に装入する球状黒鉛鋳鉄となる組成の溶湯重
量に対して球状化剤としてＦｅ−３Ｆｅ−３ｉ−，５）
を１．６％、また黒鉛化促進剤として炭化珪素を１．０
％、電極粉０．４％、Ｆｅ−８ｉを０．５％、また黒鉛
微細化剤としてＦｅ −５Ｌ（７１）−ＡＩ（０，２）
−Ｃａ（０，６） −ＲＥ （０，４２） −Ｂ ｉ
（０，５）合金をＢｉ当量で０．０１０％取鍋の底に装
填した。[Example 2] 1) Fe-3Fe-3i-,5) as a spheroidizing agent for the weight of the molten metal with the composition to become spheroidal graphite cast iron charged into a ladle.
1.6%, and 1.0% silicon carbide as a graphitization accelerator.
%, electrode powder 0.4%, Fe-8i 0.5%, and Fe-5L(71)-AI(0,2) as a graphite refiner.
-Ca (0,6) -RE (0,42) -B i
The (0,5) alloy was loaded with 0.010% Bi equivalent into the bottom of the ladle.
２）ついで球状黒鉛鋳鉄となる組成の溶湯を取鍋に装入
した。この時の溶湯の温度は１，５４０°Ｃであった。2) Next, the molten metal having the composition of spheroidal graphite cast iron was charged into the ladle. The temperature of the molten metal at this time was 1,540°C.
３）上記処理によって得た溶湯は、鉄と不可避的不純物
と次表に示す化学成分であった。3) The molten metal obtained by the above treatment contained iron, inevitable impurities, and the chemical components shown in the following table.
（ｗｔ％）
４） この溶湯を用いて第１図に示す階段状の試験片を
作成した。試験片鋳込みにあたって、Ｆｅ−３ｉ粒を接
着剤でブリケット状とした接種剤を湯口下の鋳型内に埋
め込み、いわゆる鋳型内接種を行なった。接種量はＳｉ
当量で０．１０％である。(wt%) 4) Using this molten metal, a stepped test piece shown in FIG. 1 was prepared. When casting the test piece, an inoculant made of Fe-3i grains in the form of briquettes was embedded in the mold below the sprue to perform so-called in-mold inoculation. The amount of inoculation is Si
The equivalent amount is 0.10%.
この時の注入温度は１，４１０℃であった。The injection temperature at this time was 1,410°C.
５）試験片の肉厚２ｍｍの部分の顕微鏡組織は第３図に
示すように、微細かつ多数の黒鉛が晶出し、チルの発生
は全く認められず、きわめて良好な球状黒鉛組織となっ
ている。5) As shown in Figure 3, the microscopic structure of the 2 mm thick part of the test piece shows that a large number of fine graphites are crystallized, and no chill is observed, resulting in an extremely good spheroidal graphite structure. .
〔実施例、３〕
１）取鍋内に装入する球状黒鉛鋳鉄となる組成の溶湯重
量に対して球状化剤としてＦｅ−８Ｆｅ−８ｉ−，５’
）を１．６％、また黒鉛化促進剤として炭化カルシウム
を１．０％、Ｆｅ−５ｉを０．５％、また黒鉛微細化剤
として金ｍＢｉを０．０１０％取鍋の底に装填した。[Example 3] 1) Fe-8Fe-8i-,5' was added as a spheroidizing agent to the weight of the molten metal having the composition to become spheroidal graphite cast iron charged into a ladle.
), 1.0% calcium carbide as a graphitization accelerator, 0.5% Fe-5i as a graphite refining agent, and 0.010% gold mBi as a graphite refiner were loaded at the bottom of the ladle. .
２）ついで球状黒鉛鋳鉄となる組成の溶湯を取鍋に装入
した。この時の溶湯の温度は１，５２０℃であった。2) Next, the molten metal having the composition of spheroidal graphite cast iron was charged into the ladle. The temperature of the molten metal at this time was 1,520°C.
３）上記処理によって得た溶湯は、鉄と不可避的不純物
と次表に示す化学成分であった。3) The molten metal obtained by the above treatment contained iron, inevitable impurities, and the chemical components shown in the following table.
（ｗｔ％）
４） この？８湯を用いて第１図に示す階段状の試験片
を作成した。試験片鋳込みのときＦｅ−３ｉでＳｉ当量
０．１０％を注湯流中に接種した。この時の注入温度は
１，４０５℃であった。(wt%) 4) This? A step-shaped test piece shown in FIG. 1 was prepared using 8 hot water. When casting the test piece, Fe-3i was used to inoculate 0.10% Si equivalent into the pouring stream. The injection temperature at this time was 1,405°C.
５）試験片の肉厚２ｍｍの部分の顕微鏡組織は第４図に
示すように、微細かつ多数の黒鉛が品出し、チルの発生
は全く認められず、きわめて良好な球状黒鉛組織となっ
ている。5) As shown in Figure 4, the microscopic structure of the 2 mm thick part of the test piece shows a large number of fine graphite particles, with no chill observed at all, resulting in an extremely good spheroidal graphite structure. .
〔実施例、４〕
１）取鍋内に装入する球状黒鉛鋳鉄となる組成の溶湯重
量に対して球状化剤としてＲＥｌ、５％を含有したＦｅ
−Ｓｉ−Ｍｇ（３，５）を１．６％、また黒鉛化促進
剤として炭化珪素を１．０％、Ｆｅ−５ｉを０．５％、
また黒鉛微細化剤として金属Ｂｉを０．０１ｏ％取鍋の
底に装填した。[Example 4] 1) Fe containing 5% of REL as a spheroidizing agent based on the weight of the molten metal charged into the ladle and having the composition to become spheroidal graphite cast iron.
-1.6% of Si-Mg(3,5), 1.0% of silicon carbide as a graphitization accelerator, 0.5% of Fe-5i,
In addition, 0.01% Bi metal was loaded at the bottom of the ladle as a graphite refining agent.
２）ついで球状黒鉛鋳鉄となる組成の溶湯を取鍋に装入
した。この時の溶湯の温度は１，５１５℃であった。2) Next, the molten metal having the composition of spheroidal graphite cast iron was charged into the ladle. The temperature of the molten metal at this time was 1,515°C.
３）上記処理によって得た溶湯は、鉄と不可避的不純物
と次表に示す化学成分であった。3) The molten metal obtained by the above treatment contained iron, inevitable impurities, and the chemical components shown in the following table.
（ｗｔ％）
４） この溶湯を用いて第１図に示す階段状の試験片を
作成した。試験片鋳込みのときＦｅ−５ｉでＳｉ当量０
．１０％を注湯流中に接種した。この時の注入温度は１
，４００℃であった。(wt%) 4) Using this molten metal, a stepped test piece shown in FIG. 1 was prepared. Si equivalent is 0 with Fe-5i when casting the test piece.
．． 10% was inoculated into the pouring water stream. The injection temperature at this time is 1
, 400°C.
５）試験片の肉厚２ｍｍの部分の顕微鏡組織は第５図に
示すように、微細かつ多数の黒鉛が晶出し、チルの発生
は全く認められず、きわめて良好な球状黒鉛組織となっ
ている。5) As shown in Figure 5, the microscopic structure of the 2 mm thick part of the test piece shows that a large number of fine graphite crystals were crystallized, and no chill was observed, resulting in an extremely good spheroidal graphite structure. .
〔実施例、５〕
ｌ）取鍋内に装入する球状黒鉛鋳鉄となる組成の溶湯重
量に対して、球状化剤としてＲＥｌ、５％を含有したＦ
ｅ −Ｓ Ｌ −Ｍｇ（３，５）を１．６％、また黒
鉛化促進剤として炭化珪素を１．０％、電極粉０．４％
、Ｆｅ−３ｉを０．５％、また黒鉛微細化剤として金属
Ｂｉを０．０１０％取鍋の底に装填した。[Example 5] l) F containing 5% of REL as a spheroidizing agent based on the weight of the molten metal charged into the ladle and having the composition to become spheroidal graphite cast iron.
1.6% of e-S L -Mg(3,5), 1.0% of silicon carbide as a graphitization accelerator, and 0.4% of electrode powder.
, 0.5% Fe-3i and 0.010% Bi metal as a graphite refining agent were loaded at the bottom of the ladle.
２）ついで球状黒鉛鋳鉄となる組成の溶湯を取鍋に装入
した。この時の溶湯の温度は１，５２０℃であった。2) Next, the molten metal having the composition of spheroidal graphite cast iron was charged into the ladle. The temperature of the molten metal at this time was 1,520°C.
３）上記処理によって得た溶湯は、鉄と不可避的不純物
と次表に示す化学成分であった。3) The molten metal obtained by the above treatment contained iron, inevitable impurities, and the chemical components shown in the following table.
（ｗｔ％）
４） この溶湯を用いて第１図に示す階段状の試験片を
作成した。試験片鋳込みにあたって、Ｆｅ−３ｉ粒を接
着剤でブリケット状とした接種剤を湯口下の鋳型内に埋
め込み、いわゆる鋳型内接種を行なった。接種量はＳｉ
当量で０．１０％である。(wt%) 4) Using this molten metal, a stepped test piece shown in FIG. 1 was prepared. When casting the test piece, an inoculant made of Fe-3i grains in the form of briquettes was embedded in the mold below the sprue to perform so-called in-mold inoculation. The amount of inoculation is Si
The equivalent amount is 0.10%.
この時の注入温度は１，４１０℃であった。The injection temperature at this time was 1,410°C.
５）試験片の肉厚２ｍｍの部分の顕微鏡組織は第６図に
示すように、微細かつ多数の黒鉛が晶出し、チルの発生
は全く認められず、きわめて良好な球状黒鉛組織となっ
ている。5) As shown in Figure 6, the microscopic structure of the 2 mm thick part of the test piece shows that a large number of fine graphite crystals are crystallized, and no chill is observed, resulting in an extremely good spheroidal graphite structure. .
〔実施例、６〕
１）取鍋内に装入する球状黒鉛鋳鉄となる組成の溶湯重
量に対して、球状化剤としてＲＥｌ、５％を含有したＦ
ｅ Ｓ ｉ Ｍｇ（３，５）を１．６％、また黒
鉛化促進剤として炭化カルシウムを１．０％、電極粉０
．４％、Ｆｅ−３ｉを０．５％、また黒鉛微細化剤とし
てＦｅ −５Ｌ（７１）−Ａｌ（０，２）−Ｃａ（０，
６）−ＲＥ （０，４２） −Ｂ ｉ（０，５）合金を
Ｂｉ当量で０．０１０％取鍋の底に装填した。[Example 6] 1) F containing 5% of REl as a spheroidizing agent based on the weight of the molten metal having the composition to become spheroidal graphite cast iron charged into a ladle.
e Si Mg(3,5) 1.6%, calcium carbide 1.0% as a graphitization accelerator, electrode powder 0
．． 4%, Fe-3i 0.5%, and Fe-5L(71)-Al(0,2)-Ca(0,
6) -RE (0,42) -B i (0,5) alloy was loaded with 0.010% Bi equivalent at the bottom of the ladle.
２）ついで球状黒鉛鋳鉄となる組成の溶湯を取鍋に装入
した。この時の溶湯の温度は１，５２５°Ｃであった。2) Next, the molten metal having the composition of spheroidal graphite cast iron was charged into the ladle. The temperature of the molten metal at this time was 1,525°C.
３）上記処理によって得た溶湯は、鉄と不可避的不純物
と数表に示す化学成分であった。3) The molten metal obtained by the above treatment contained iron, inevitable impurities, and the chemical components shown in the table.
（ｗｔ％）
４） この溶湯を用いて第１図に示す階段状の試験片を
作成した。試験片鋳込みにあたって、Ｆｅ−８ｉ粒を接
着剤でブリケット状とした接種剤を湯口下の鋳型内に埋
め込み、いわゆる鋳型内接種を行なった。接種量はＳｉ
当量で０．１０％である。(wt%) 4) Using this molten metal, a stepped test piece shown in FIG. 1 was prepared. In casting the test piece, an inoculant made of Fe-8i grains in the form of briquettes was embedded in the mold below the sprue to perform so-called in-mold inoculation. The amount of inoculation is Si
The equivalent amount is 0.10%.
この時の注入温度は１，４１０℃であった。The injection temperature at this time was 1,410°C.
５）試験片の肉厚２ｍｍの部分の顕微鏡組織は第７図に
示すように、微細かつ多数の黒鉛が晶出し、チルの発生
は全く認められず、きわめて良好な球状黒鉛組織となっ
ている。5) As shown in Figure 7, the microscopic structure of the 2 mm thick part of the test piece shows that a large number of fine graphites are crystallized, and no chill is observed, resulting in an extremely good spheroidal graphite structure. .
本発明により製造された球状黒鉛鋳鉄の特徴を列記する
と下記の通りである。The characteristics of the spheroidal graphite cast iron produced according to the present invention are listed below.
同一肉厚において比較すると、
１、黒鉛粒数が通常の球状黒鉛鋳鉄に比へて２倍以上と
多いためチルの発生が皆無である。Comparing the same wall thickness, 1. The number of graphite particles is more than twice that of normal spheroidal graphite cast iron, so there is no chilling.
２、薄肉品においてチルの発生がないことは、鋳放し化
、もしくは低温域での熱処理を可能とする。2. The absence of chilling in thin-walled products allows for as-cast or heat treatment at low temperatures.
これは熱処理費の低減につながる。This leads to a reduction in heat treatment costs.
３、複雑な鋳物品の高温域での熱処理は歪の発生を大き
くするが、鋳放し化および低温域での熱処理では歪取工
程の必要がない。3. Heat treatment in a high temperature range for complex castings increases the occurrence of strain, but as-cast casting and heat treatment in a low temperature range do not require a strain relief process.
以上の説明で明らかなように、本発明により製造された
球状黒鉛鋳鉄は、製造工程が短縮されるので製造原価が
きわめて低廉であるなど工業的に顕著な効果を有するも
のである。As is clear from the above description, the spheroidal graphite cast iron manufactured according to the present invention has significant industrial effects such as extremely low manufacturing costs because the manufacturing process is shortened.
第１図は試験片の斜視図、第２〜７図は１００倍の金属
顕微鏡組織写真である。FIG. 1 is a perspective view of the test piece, and FIGS. 2 to 7 are photographs of the metallurgical microstructure at 100 times magnification.
Claims (1)
化促進剤および黒鉛微細化剤とを取鍋内に装填し、該取
鍋内に球状黒鉛鋳鉄となる組成の溶湯を装入して球状化
処理を行ない、鋳型に注入することを特徴とする球状黒
鉛鋳鉄の製造法。 ２、上記球状化処理を行なった後、溶湯が鋳型内製品空
隙部に流れ込む以前に接種を行なうことを特徴とする特
許請求の範囲第１項記載の球状黒鉛鋳鉄の製造法。 ３、上記球状化剤はＭｇ又はＭｇを含む合金である特許
請求の範囲第１項又は第２項記載の球状黒鉛鋳鉄の製造
法。 ４、上記黒鉛化促進剤は炭化珪素又は炭化珪素と炭素又
は炭化珪素と炭素とＳｉ合金である特許請求の範囲第１
項ないし第３項の何れかに記載の球状黒鉛鋳鉄の製造法
。 ５、上記黒鉛化促進剤は炭化カルシウム又は炭化カルシ
ウムと炭素又は炭化カルシウムと炭素とＳｉ合金である
特許請求の範囲第１項ないし第３項のいずれかに記載の
球状黒鉛鋳鉄の製造法。 ６、上記黒鉛微細化剤はＢｉ又はＢｉを含む材料である
特許請求の範囲第１項ないし第５項のいずれかに記載の
球状黒鉛鋳鉄の製造法。[Claims] 1. In producing spheroidal graphite cast iron, a spheroidizing agent, a graphitization accelerator, and a graphite refining agent are loaded into a ladle, and the composition of the spheroidal graphite cast iron is charged into the ladle. A method for producing spheroidal graphite cast iron characterized by charging molten metal, subjecting it to spheroidization treatment, and pouring it into a mold. 2. The method for producing spheroidal graphite cast iron according to claim 1, characterized in that after the spheroidizing treatment is performed, inoculation is performed before the molten metal flows into the product cavity in the mold. 3. The method for producing spheroidal graphite cast iron according to claim 1 or 2, wherein the spheroidizing agent is Mg or an alloy containing Mg. 4. Claim 1, wherein the graphitization accelerator is silicon carbide, silicon carbide and carbon, or silicon carbide, carbon and Si alloy.
A method for producing spheroidal graphite cast iron according to any one of Items 1 to 3. 5. The method for producing spheroidal graphite cast iron according to any one of claims 1 to 3, wherein the graphitization accelerator is calcium carbide, calcium carbide and carbon, or a calcium carbide, carbon and Si alloy. 6. The method for producing spheroidal graphite cast iron according to any one of claims 1 to 5, wherein the graphite refiner is Bi or a material containing Bi.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29381587A JPH01136919A (en) | 1987-11-20 | 1987-11-20 | Production of spheroidal graphite cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29381587A JPH01136919A (en) | 1987-11-20 | 1987-11-20 | Production of spheroidal graphite cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01136919A true JPH01136919A (en) | 1989-05-30 |
Family
ID=17799507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29381587A Pending JPH01136919A (en) | 1987-11-20 | 1987-11-20 | Production of spheroidal graphite cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01136919A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03146638A (en) * | 1989-11-01 | 1991-06-21 | Fukushima Seiko Kk | Suction type expendable casting mold method |
-
1987
- 1987-11-20 JP JP29381587A patent/JPH01136919A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03146638A (en) * | 1989-11-01 | 1991-06-21 | Fukushima Seiko Kk | Suction type expendable casting mold method |
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