JPH02200718A - Manufacture of spheroidal graphite niresist cast iron - Google Patents
Manufacture of spheroidal graphite niresist cast ironInfo
- Publication number
- JPH02200718A JPH02200718A JP2235889A JP2235889A JPH02200718A JP H02200718 A JPH02200718 A JP H02200718A JP 2235889 A JP2235889 A JP 2235889A JP 2235889 A JP2235889 A JP 2235889A JP H02200718 A JPH02200718 A JP H02200718A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- graphite
- niresist cast
- niresist
- ductile
- 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
- 229910001018 Cast iron Inorganic materials 0.000 title claims abstract description 32
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 26
- 239000010439 graphite Substances 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000002054 inoculum Substances 0.000 claims abstract description 11
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 5
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 5
- 229910014458 Ca-Si Inorganic materials 0.000 claims abstract 3
- 229910017082 Fe-Si Inorganic materials 0.000 claims abstract 3
- 229910017133 Fe—Si Inorganic materials 0.000 claims abstract 3
- 238000005266 casting Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 7
- 238000005260 corrosion Methods 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 2
- 229910052759 nickel Inorganic materials 0.000 abstract description 2
- 230000002542 deteriorative effect Effects 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 description 15
- 239000002184 metal Substances 0.000 description 15
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052702 rhenium 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〕
本発明は球状黒鉛ニレジスト鋳鉄の製造方法であ−ｊ・
て、高強度、耐熱性、耐蝕性を減殺することなく、しか
も湯流れ良好で鋳造性の良い球状黒鉛ニレジスト鋳鉄の
製造方法を捉供することにある。[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for producing spheroidal graphite resist cast iron.
The object of the present invention is to provide a method for producing spheroidal graphite nyresist cast iron that has good flow and castability without reducing its high strength, heat resistance, and corrosion resistance.
ニレジスト鋳鉄とは、成分中にＮｉ１２％以上及びＣｒ
とを含有した鋳鉄であって、極めて耐蝕性に優れたもの
であるが、組織中の黒鉛が片状黒鉛であるため強度が低
い。これを解決するため、黒鉛球状化剤としてＮｉ−ｋ
１ｇ合金を用い′Ｃ黒鉛を球状化したもの（特開昭５８
７１３５３号公報）又は黒鉛球状化剤としてＭｇを添加
した球状黒鉛ニレジスト鋳鉄（以下ダクタイルニレジス
ト鋳鉄という）が公知である。Niresist cast iron is a composition containing 12% or more of Ni and Cr.
Although it is a cast iron containing extremely excellent corrosion resistance, its strength is low because the graphite in its structure is flaky graphite. To solve this problem, Ni-k was used as a graphite nodularizing agent.
'C graphite spheroidized using 1g alloy (Japanese Patent Application Laid-Open No. 58
No. 71353) or spheroidal graphite Niresist cast iron (hereinafter referred to as ductile Niresist cast iron) to which Mg is added as a graphite nodularizing agent are known.
ｒ本発明が解決しようとする課題〕
前述従来のダクタイルニレジスト鋳鉄は高融点のＮｉ等
を含有し、特にｌ１ｉ３０％以−Ｌのものは、鋳造時の
流動性が悪く、鋳造時の温度管理幅が狭く鋳造量が限定
され、鋳造条件がシビャーであるほか、コスト上昇の要
因ともなるという欠点がある。[Problems to be Solved by the Present Invention] The conventional ductile resist cast iron mentioned above contains high-melting-point Ni, etc., and especially those with l1i of 30% or more have poor fluidity during casting, and temperature control during casting is difficult. The disadvantage is that the width is narrow, the casting amount is limited, the casting conditions are severe, and it also causes an increase in costs.
本発明はダクタイルニレジスト鋳鉄の高強度、耐熱性、
耐蝕性を同等減殺する事なくさらに流動性を改善できる
ダクタイルニレジスト鋳鉄の製造法を提供することにあ
る。The present invention is characterized by the high strength, heat resistance, and
The object of the present invention is to provide a method for producing ductile resist cast iron that can further improve fluidity without compromising corrosion resistance.
本発明はＮｉ３０％以上のダクタイルニレジスト鋳鉄の
製造に当たり、ダクタイルニレジスト鋳鉄の溶湯に対し
、接種剤としてＦｅ−３ｉＯ，１〜０．２％、Ｓｂ ０
１０１〜０．０５％、Ｃａ−５ｉ Ｏ，０１〜０．０３
％、及び希土類金属０．００５〜０．０３％を添加する
ことによって流動性の高いダクタイルニレジスト鋳鉄を
製造する方法である。In the production of ductile Ni-resist cast iron containing 30% or more Ni, the present invention applies Fe-3iO, 1 to 0.2%, Sb 0 as an inoculant to the molten ductile Ni-resist cast iron.
101-0.05%, Ca-5i O, 01-0.03
% and 0.005 to 0.03% of rare earth metals to produce highly fluid ductile resist cast iron.
本発明の対象とするダクタイルニレジスト鋳鉄の一般的
組成は下記第１表の如きものである。The general composition of ductile resist cast iron, which is the object of the present invention, is as shown in Table 1 below.
第１表
（単位 ％）
即ち、本発明の対象とするダクタイルニレジスト鋳鉄は
Ｎｉ３０％以上好ましくは３０〜３８％のもので、片状
黒鉛のニレジスト鋳鉄に、黒鉛球状化剤としてｌ１ｇを
溶湯に対し、１．３〜１．４％添加して黒鉛を球状化し
たものである。Table 1 (unit: %) That is, the ductile Niresist cast iron that is the subject of the present invention has Ni of 30% or more, preferably 30 to 38%, and is made of flaky graphite Niresist cast iron, and 1 g of graphite is added to the molten metal as a graphite nodularizing agent. On the other hand, graphite is spheroidized by adding 1.3 to 1.4%.
また、益に使用する接種剤としてのＦｅ−８ｉは一般に
市販されているもの、Ｃａｄｉも一般に市販されている
Ｃａ２５％以上、Ｓｉ ５５〜６５％とからなるもので
あり、また希土類金属（以下Ｒｅという）はＣｅ：Ｌａ
＝ ２：１からなるものである。前記Ｆｅ−３ｉ等の接
種剤の添加は、片状黒鉛のニレジスト鋳鉄に−ｇ等の黒
鉛球状化剤を取鍋で添加すると同時に添加することがで
きるが、これに限定されるものではなく、あらかじめダ
クタイルニレジスト鋳鉄を生成した後、別個にＦｅ−５
ｉ等の接種剤を添加しても良い。In addition, Fe-8i used as an inoculant is generally commercially available, and Cadi is also generally commercially available and consists of 25% or more of Ca and 55 to 65% Si, and rare earth metals (hereinafter referred to as Re ) is Ce:La
= 2:1. The inoculant such as Fe-3i can be added to flaky graphite Niresist cast iron at the same time as the graphite nodularizing agent such as -g is added in a ladle, but is not limited to this. After producing ductile resist cast iron in advance, Fe-5 is separately produced.
An inoculant such as i may be added.
以りのようにダクタイルニレジスト鋳鉄に、Ｆｅ−５ｉ
、 Ｃａ−−５ｉ、 Ｒｅ及びｓｂを混合添加すること
によってＳｉ系合金及びＲｅ等の効果が相乗され、Ｎｉ
３０％以上のダクタイルニレジスト鋳鉄の鋳造時の流動
性か大「１１に改善できる。As shown below, Fe-5i is applied to ductile resist cast iron.
By mixing and adding , Ca--5i, Re and sb, the effects of Si-based alloy and Re etc. are synergized, and Ni
The fluidity during casting of ductile resist cast iron of 30% or more can be improved to 11.
また、接種剤の使用量が本発明の範囲未満であるときは
流動性は改善できず、該範囲を超左でも実質的に流動性
は変わらず、コスト上昇を招き好ましくない。Further, if the amount of inoculant used is less than the range of the present invention, the fluidity cannot be improved, and even if the amount exceeds the range, the fluidity will not substantially change, which is undesirable as it will increase the cost.
尚、接種剤中にｓｂを添加するのは、一般に溶湯にＲｅ
（主としてＣｅ）を添加すると、異常黒鉛（チャンギー
黒鉛）が発生し、易くなり、強度的に劣化するおそれが
あるが、Ｒｅの敵対元素であるｓｂを添加すると、両者
の相乗効果によって異常黒鉛の発生を抑制でき、従って
強度を」ユ昇することができる。In addition, adding sb to the inoculant is generally done by adding Re to the molten metal.
When (mainly Ce) is added, abnormal graphite (Chungi graphite) is generated and becomes easy to form, and there is a risk of deterioration in strength. However, when sb, which is an enemy element of Re, is added, the synergistic effect of the two causes abnormal graphite to form. The occurrence can be suppressed and the strength can therefore be increased.
つぎに、本発明を下記実験例をもつ°Ｃ具体的に説明す
る。Ｆ記第２表の組成からなるニレジスト鋳鉄２００
ｋｇを高周波電気炉で溶解する。Next, the present invention will be specifically explained using the following experimental examples. Niresist cast iron 200 having the composition shown in Table F
kg is melted in a high frequency electric furnace.
第 ２ 表（単位％）
他方、前記電気炉の炉前の球状化処理取鍋に溶湯に対し
黒鉛球状化剤として舅ｇ１．３〜１．４％並びに接種剤
としてＦｅ−５ｉ （Ｓｉ５０％）０．２％、ｓｂｏ、
ｏｓ％、Ｃａ−３ｉ（Ｃａ２５％、５ｉ６５％）０．１
％、ＲｅＯ，０１％を夫々添加し、これに前記溶湯を１
６００℃で出湯してダクタイルニレジスト鋳鉄溶湯を得
る（以下これをＮｏ、 ｌとする）。Table 2 (Unit: %) On the other hand, 1.3 to 1.4% of graphite as a spheroidizing agent and Fe-5i (Si50%) as an inoculant were added to the molten metal in the spheroidizing ladle in front of the electric furnace. 0.2%, sbo,
os%, Ca-3i (Ca25%, 5i65%) 0.1
%, ReO, and 01%, respectively, and 1% of the molten metal was added to this.
The molten metal is tapped at 600°C to obtain ductile resist cast iron (hereinafter referred to as No. 1).
尚、比較のために前記と同一の溶湯に黒鉛球状化剤とし
゛（Ｍｇ及び接種剤としてＦｅ−３ｉ（Ｓｉ５０％）０
，２％接種したものを用意する（以下Ｎｏ。For comparison, a graphite nodularizing agent (Mg and Fe-3i (50% Si) as an inoculant) was added to the same molten metal as above.
, prepare a 2% inoculated one (hereinafter No.
２とする）。2).
前記Ｎｏ、 １及びＮｏ、 ２の２つの溶湯について、
第１図及び第２図に示す渦巻形流動性試験鋳型（Ｌ、
Ｆ、、 Ｐｏｒｔｅｒ及びＰ、 Ｃ，Ｒｏｓｅｒｉｔｈ
ａＤに鋳込み、温度に対する湯の渦巻長さを比較した処
、第３表の通りであった。Regarding the two molten metals No. 1 and No. 2,
Spiral fluidity test mold (L,
F. Porter and P. C. Roserich
Table 3 shows the comparison of the swirl length of the molten metal with respect to the temperature.
第３図は第３表におけるＮ０９１．１５００℃の渦巻長
さを１００とし、第３表をグラフ化したものを示したも
のである。FIG. 3 is a graph of Table 3, with the spiral length of N091.1500° C. in Table 3 set as 100.
第３表及び第３図から明らかなように、本発明法におけ
るＮｏ、 ｌの溶湯は、渦巻長さはＮｏ。As is clear from Table 3 and Figure 3, the molten metal No. 1 in the method of the present invention has a spiral length of No.
２の溶湯に比較して長く、各温度において５．９〜２４
．５％の延びを示しており、明らかに流動性が改占され
ているのが認められる。It is longer than the molten metal of No. 2, and is 5.9 to 24 at each temperature.
．． This shows an increase of 5%, which clearly shows that liquidity has been taken over.
また、前記Ｎｏ、 １及びＮｏ、 ２の溶湯を夫々１５
００℃より砂型に鋳造した。砂型は夫々ｌＯ型鋳造し、
また鋳造法案については同じ物を使用した。In addition, 15 mols of the above No. 1 and No. 2 molten metals, respectively.
It was cast into a sand mold at 00°C. The sand molds were each 1O type cast.
Also, the same casting bill was used.
その結果、Ｎｏ、 ｌの溶湯については１０型全数鋳造
することができた反面、Ｎｏ、 ２の溶湯では４型以降
湯回り不良が発生し、鋳造出来なかった。As a result, while it was possible to cast all 10 types of molten metal No. 1, it was not possible to cast the molten metal No. 2 due to poor running of the molten metal from 4 onwards.
以」−の如く本発明はダクタイルニレジスト鋳鉄、特に
Ｎｉ３０％以上の高品位のものを耐強度、耐熱性、耐蝕
性を減殺することなく間中な手段で流動性を大巾に改善
することができるほか、鋳造時の温度管理も従来より広
くすることができ、またＩバッチの溶湯で鋳造できる個
数も増加できるから、作業能率が改善できると共に、コ
ストダウンにも寄１ｊできるという効果がある。As described above, the present invention is to significantly improve the fluidity of ductile resist cast iron, especially high-grade ones containing 30% or more Ni, by intermediate means without reducing strength, heat resistance, and corrosion resistance. In addition, temperature control during casting can be made wider than before, and the number of pieces that can be cast with I-batch molten metal can be increased, which has the effect of improving work efficiency and reducing costs. .
第１図は渦巻形流動性試験鋳型の断面図、第２図はその
平面図、第３図は渦巻形流動性試験鋳型における鋳造温
度に対する渦巻長さの関係を示すグラフの一例である。FIG. 1 is a sectional view of a spiral flowability test mold, FIG. 2 is a plan view thereof, and FIG. 3 is an example of a graph showing the relationship between spiral length and casting temperature in the spiral flowability test mold.
Claims (1)
り、球状黒鉛ニレジスト鋳鉄の溶湯に対し、接種剤とし
てＦｅ−Ｓｉ０．１〜０．３％、Ｓｂ０．０１〜０．０
５％、Ｃａ−Ｓｉ０．０１〜０．０３％及び希土類金属
０．００５〜０．０３％を添加することを特徴とする球
状黒鉛ニレジスト鋳鉄の製造方法。In the production of spheroidal graphite Niresist cast iron containing 30% or more Ni, 0.1 to 0.3% Fe-Si and 0.01 to 0.0 Sb are added as inoculants to the molten spheroidal graphite Niresist cast iron.
5%, Ca-Si 0.01-0.03%, and rare earth metal 0.005-0.03%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2235889A JPH02200718A (en) | 1989-01-31 | 1989-01-31 | Manufacture of spheroidal graphite niresist cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2235889A JPH02200718A (en) | 1989-01-31 | 1989-01-31 | Manufacture of spheroidal graphite niresist cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02200718A true JPH02200718A (en) | 1990-08-09 |
Family
ID=12080413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2235889A Pending JPH02200718A (en) | 1989-01-31 | 1989-01-31 | Manufacture of spheroidal graphite niresist cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02200718A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014076404A1 (en) | 2012-11-14 | 2014-05-22 | Ferropem | Inoculant alloy for thick cast-iron parts |
-
1989
- 1989-01-31 JP JP2235889A patent/JPH02200718A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014076404A1 (en) | 2012-11-14 | 2014-05-22 | Ferropem | Inoculant alloy for thick cast-iron parts |
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