JPS6112982B2 - - Google Patents
Info
- Publication number
- JPS6112982B2 JPS6112982B2 JP52582A JP52582A JPS6112982B2 JP S6112982 B2 JPS6112982 B2 JP S6112982B2 JP 52582 A JP52582 A JP 52582A JP 52582 A JP52582 A JP 52582A JP S6112982 B2 JPS6112982 B2 JP S6112982B2
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- antimony
- graphite cast
- spheroidal graphite
- amount
- 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
- 229910001141 Ductile iron Inorganic materials 0.000 claims description 29
- 229910052787 antimony Inorganic materials 0.000 claims description 26
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 21
- 239000010949 copper Substances 0.000 claims description 21
- 229910052802 copper Inorganic materials 0.000 claims description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 20
- 239000010936 titanium Substances 0.000 claims description 20
- 229910052719 titanium Inorganic materials 0.000 claims description 20
- 229910002804 graphite Inorganic materials 0.000 claims description 19
- 239000010439 graphite Substances 0.000 claims description 19
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 15
- 239000011777 magnesium Substances 0.000 claims description 15
- 229910052749 magnesium Inorganic materials 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 5
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052684 Cerium Inorganic materials 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 235000000396 iron Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910001060 Gray iron Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Description
本発明はひけ巣がなく組織が均一で緻密な球状
黒鉛鋳鉄に関するものである。
球状黒鉛鋳鉄は強度などの機械的性質にすぐれ
耐摩耗性も良好であるため自動車のフロントアク
スルハブ、デフケース、クランクシヤフト等の
他、高級機械部品の材料として適している。ま
た、従来の球状黒鉛鋳鉄における黒鉛球状化剤を
減少せしめ、あるいはチタンを添加する等の手段
により黒鉛球状化率を50％〜75％程度と低くした
鋳鉄が開発されている。この鋳鉄は一般に擬球状
黒鉛鋳鉄と称されているが、これは従来の球状黒
鉛鋳鉄の鋳造性を改善したもので、強度はねずみ
鋳鉄よりもすぐれ球状黒鉛鋳鉄に近似する。本発
明の球状黒鉛鋳鉄は上記擬球状黒鉛鋳鉄も含む球
状黒鉛鋳鉄を意味する。なおここで、
黒鉛球状化率（％）＝０×ｎ＋０．３×ｎ＋０．７×ｎ＋０．９×ｎ＋１．０×ｎ／ｎ＋ｎ＋ｎ＋
ｎ＋ｎ
ただし、ｎ〜ｎは第２図の形態記号に該当す
る黒鉛の数である。
上記意味における球状黒鉛鋳鉄は一般に2.8％
〜4.2％（重量％、以下同じ）程度の炭素、1.5％
〜4.3％程度のシリコンを含み、また微量のマン
ガン、リン、硫黄を含むがそれぞれの上限は一般
にマンガン0.8％、リン0.2％、硫黄0.05％程度で
ある。チタンは黒鉛の球状化を阻害し、かつ黒鉛
の球状化の程度を型（第２図）に一様に揃える
性質をもつもので、目的とする黒鉛球状化率に応
じて添加されるが一般には不純物として存在する
程度から0.5％程度の範囲である。なお、黒鉛球
状化剤としてはマグネシウム系、セリウム系（マ
グネシウムの他セリウムを含む）、カルシウム系
（マグネシウムの他のカルシウムを含む）が用い
られる。
ところで上記従来の球状黒鉛鋳鉄は、前述の如
きすぐれた特性をもつ反面、鋳造時のひけ量が大
であつてひけ巣が発生し、これがしばしば割れの
原因となるという欠点がある。本発明はこのひけ
量を可及的に少なく均一な組織の球状黒鉛鋳鉄を
得ることに成功したのである。
発明者らは種々実験を重ねた結果、球状黒鉛鋳
鉄中のチタン量上限を0.3％におさえるととも
に、従来は球状黒鉛鋳鉄において望ましくない元
素とされていたアンチモンを0.01％〜0.04％の範
囲で積極的に添加した組織、およびアンチモン
0.01〜0.04％とともに銅1.0％〜5.0％を積極的に
添加した組織は、従来の球状黒鉛鋳鉄および擬球
状黒鉛鋳鉄に比してひけ量を著しく減少せしめて
均一な組織のものとすることができることを見出
したのである。
即ち、本発明の球状黒鉛鋳鉄の組成は、炭素
2.8％〜4.2％、シリコン1.5〜4.3％、マンガン0.8
％以下、リン0.2％以下、硫黄0.05％以下、チタ
ン0.3％以下、マグネシウム0.005％〜0.07％の他
に、0.01％〜0.04％のアンチモン、または0.01％
〜0.04％のアンチモンとともに1.0％〜5.0％の銅
を含み、残部実質的に鉄の組成を有する。かくし
て、黒鉛球状化剤としてマグネシウム系を用いる
ときは0.01％〜0.07％のマグネシウム、セリウム
系またはカルシウム系を用いるときは0.005％〜
0.05％マグネシウムが望ましい範囲である。そし
てこの範囲内においてマグネシウムを多くすると
きは球状化率は増大し、少くするときは球状化率
は減少する傾向を示し擬球状黒鉛鋳鉄の組織とな
る。本発明の球状黒鉛鋳鉄の黒鉛球状化率は50％
以上である。
以下本発明の詳細を実験例に基づき説明する。
実験例
(1) 球状黒鉛鋳鉄中のチタン、銅およびアンチモ
ンのひけ巣に及ぼす影響を確認するための実験
を行なつた。結果を第１図に示す。これらはい
ずれも炭素3.8％、シリコン2.7％、マンガン
0.25％、リン0.02％、硫黄0.01％を基本成分と
し所定量のマグネシウムを含む。鋳造条件はい
ずれも高周波誘導炉で溶解し、1400℃にてシエ
ル鋳型に注湯して鋳造した。ひけ巣量は水中浸
漬法により求めた。
図中線１はマグネシウム0.045％〜0.05％
で、銅およびアンチモンはいずれも添加されて
いない。線２はマグネシウム0.045％〜0.05％
で3.9％の銅が含有されている。線３はマグネ
シウム0.045％〜0.05％で0.02％のアンチモンが
含有されている。線４はマグネシウム0.02％〜
0.022％で２％の銅と0.02％のアンチモンが含
有されている。
この結果よりチタン量が増加するとともにひ
け量が増加することがわかる。また、銅または
アンチモンの添加によりひけ量は著しく減少
し、就中アンチモンを添加したとき、およびア
ンチモンおよび銅を複合添加したときはその効
果が特にすぐれていることがわかる。また銅お
よびアンチモンを複合添加したときはチタンの
増加にかかわらずひけ量が減少する傾向を示し
ている。
(2) 上記と同一の鋳造条件にて鋳造した各種組成
の球状黒鉛鋳鉄について、ひけ量、引張り強さ
を測定し、また黒鉛の球状化状態をしらべた。
その代表例を第１表および第２表に示す。第１
表は試料の組成、第２表は各試料の試験結果を
示す。第２表中〜は、黒鉛粒子形態分類を
示す第２図の第形態〜第形態に相当する。
試料中７〜９が本発明の球状黒鉛鋳鉄であり、
他は比較材である。
表においては試料１は従来一般の球状黒鉛鋳
鉄であり、試料２は球状黒鉛鋳鉄組成にチタン
を添加したもので、これにより上記擬球状黒鉛
鋳鉄となるが、ひけ量は増している。試料３は
チタンの他に銅を添加したものであるが、銅の
添加にかかわらずひけ量が大であるのはチタン
量が0.5％と多いことによるものと認められ
る。試料４は錫を添加したものであり、ひけ量
は少ないが組織内に微細欠陥が生じ好ましくな
い。試料５および６はチタンとともに銅を添加
したもので、試料１〜３に比しひけ量は著しく
減少し、また引張強さにもすぐてれいる。
試料７〜９は本発明の球状黒鉛鋳鉄である。
試料７は上記の銅にかえアンチモンを添加した
もので、ひけ量は更に大幅に少く試料１の1/4
以下となる。試料８はチタンを含まず、アンチ
モンを添加したものでひけ量は少なく試料７と
同程度である。なお球状化率の高いのはチタン
を含まないことによるものと認められる。試料
９はチタンとともに銅およびアンチモンの両方
を含有するものでひけ量の減少は試料７に匹敵
し、極めて良好である。
The present invention relates to spheroidal graphite cast iron that is free from shrinkage cavities and has a uniform and dense structure. Spheroidal graphite cast iron has excellent mechanical properties such as strength and good wear resistance, so it is suitable as a material for automobile front axle hubs, differential cases, crankshafts, and other high-end mechanical parts. In addition, cast iron has been developed in which the graphite nodularization rate is lowered to about 50% to 75% by reducing the graphite nodularizing agent in conventional spheroidal graphite cast iron or adding titanium. This cast iron is generally called pseudo-spheroidal graphite cast iron, which has improved castability from conventional spheroidal graphite cast iron, and its strength is superior to that of gray cast iron and is similar to that of spheroidal graphite cast iron. The spheroidal graphite cast iron of the present invention means spheroidal graphite cast iron including the above-mentioned pseudospheroidal graphite cast iron. Here, graphite spheroidization rate (%) = 0 x n + 0.3 x n + 0.7 x n + 0.9 x n + 1.0 x n/n + n + n +
n+n However, n to n are the numbers of graphite corresponding to the form symbols in FIG. Spheroidal graphite cast iron in the above sense is generally 2.8%
~4.2% (weight%, same below) carbon, 1.5%
It contains about 4.3% silicon and trace amounts of manganese, phosphorus, and sulfur, but the upper limits for each are generally about 0.8% manganese, 0.2% phosphorus, and 0.05% sulfur. Titanium has the property of inhibiting the spheroidization of graphite and making the degree of spheroidization of graphite uniform in the mold (Figure 2), and is added depending on the desired graphite spheroidization rate, but it is generally ranges from the level of existing as an impurity to about 0.5%. As the graphite spheroidizing agent, a magnesium type, a cerium type (contains cerium in addition to magnesium), and a calcium type (contains calcium in addition to magnesium) are used. By the way, although the conventional spheroidal graphite cast iron has the above-mentioned excellent properties, it has the disadvantage that it has a large amount of shrinkage during casting, which causes shrinkage cavities, which often cause cracks. The present invention has succeeded in obtaining spheroidal graphite cast iron with a uniform structure while minimizing the amount of sinkage. As a result of various experiments, the inventors have suppressed the upper limit of the amount of titanium in spheroidal graphite cast iron to 0.3%, and have proactively reduced the amount of antimony, which was traditionally considered an undesirable element in spheroidal graphite cast iron, in the range of 0.01% to 0.04%. tissue added, and antimony
The structure in which 1.0% to 5.0% of copper is actively added together with 0.01 to 0.04% has a uniform structure with significantly reduced sinkage compared to conventional spheroidal graphite cast iron and pseudospheroidal graphite cast iron. I discovered what I could do. That is, the composition of the spheroidal graphite cast iron of the present invention is carbon
2.8%~4.2%, silicon 1.5~4.3%, manganese 0.8
% or less, phosphorus 0.2% or less, sulfur 0.05% or less, titanium 0.3% or less, magnesium 0.005% to 0.07%, as well as 0.01% to 0.04% antimony, or 0.01%
Contains 1.0% to 5.0% copper along with ~0.04% antimony, with the remainder having a substantially iron composition. Thus, 0.01% to 0.07% magnesium when using a magnesium-based graphite nodularizing agent, and 0.005% to 0.005% when using a cerium-based or calcium-based agent.
0.05% magnesium is the preferred range. Within this range, when magnesium is increased, the spheroidization rate increases, and when it is decreased, the spheroidization rate tends to decrease, resulting in a structure of pseudo-spheroidal graphite cast iron. The graphite spheroidization rate of the spheroidal graphite cast iron of the present invention is 50%
That's all. The details of the present invention will be explained below based on experimental examples. Experimental example (1) An experiment was conducted to confirm the effects of titanium, copper, and antimony on shrinkage cavities in spheroidal graphite cast iron. The results are shown in Figure 1. These are all 3.8% carbon, 2.7% silicon, and manganese.
The basic ingredients are 0.25%, 0.02% phosphorus, and 0.01% sulfur, and a specified amount of magnesium. The casting conditions were as follows: All materials were melted in a high-frequency induction furnace and poured into a shell mold at 1400°C. The amount of shrinkage cavities was determined by the underwater immersion method. Line 1 in the figure is magnesium 0.045% to 0.05%
However, neither copper nor antimony is added. Line 2 is magnesium 0.045% to 0.05%
It contains 3.9% copper. Line 3 contains 0.045% to 0.05% magnesium and 0.02% antimony. Line 4 is magnesium 0.02%~
0.022% contains 2% copper and 0.02% antimony. This result shows that as the amount of titanium increases, the amount of sinkage increases. It can also be seen that the amount of sinkage is significantly reduced by adding copper or antimony, and the effect is particularly excellent when antimony is added, and when antimony and copper are added in combination. Furthermore, when copper and antimony are added in combination, the amount of sinkage tends to decrease regardless of the increase in titanium. (2) The sinkage and tensile strength of spheroidal graphite cast irons of various compositions cast under the same casting conditions as above were measured, and the state of spheroidization of graphite was investigated.
Representative examples are shown in Tables 1 and 2. 1st
The table shows the composition of the samples, and Table 2 shows the test results for each sample. In Table 2, . . . corresponds to morphologies 1 to 3 in FIG. 2, which show graphite particle morphological classifications.
Samples 7 to 9 are spheroidal graphite cast iron of the present invention,
The others are comparative materials. In the table, Sample 1 is a conventional general spheroidal graphite cast iron, and Sample 2 is a spheroidal graphite cast iron with titanium added to it, resulting in the above-mentioned pseudo-spheroidal graphite cast iron, but with an increased sinkage amount. Sample 3 has copper added in addition to titanium, and it is recognized that the reason why the amount of sinkage is large regardless of the addition of copper is because the amount of titanium is as high as 0.5%. Sample 4 has tin added, and although the amount of sinkage is small, minute defects occur within the structure, which is not preferable. Samples 5 and 6 have copper added together with titanium, and have significantly reduced sinkage compared to samples 1 to 3, and also have excellent tensile strength. Samples 7 to 9 are spheroidal graphite cast irons of the present invention.
Sample 7 is made by adding antimony instead of the copper mentioned above, and the sinkage amount is much smaller, 1/4 of that of sample 1.
The following is true. Sample 8 does not contain titanium, but has antimony added, and has a small amount of sinkage, which is comparable to that of sample 7. It is recognized that the high spheroidization rate is due to the fact that it does not contain titanium. Sample 9 contains both copper and antimony as well as titanium, and the reduction in sinkage is comparable to Sample 7 and is extremely good.
【表】【table】
【表】【table】
【表】
以上、実験の代表例を示したが、発明者らの行
なつた実験の結果を綜合するに、チタン量は0.3
％以下が適当であり、0.03％を越えてチタンを添
加すると、銅およびアンチモンを添加してもこれ
等のひけ巣量減少効果が充分に発揮されない。ア
ンチモンは添加量が0.01％未満ではひけ巣量減少
効果が不充分であり、一方0.04％を越えると通称
内ひげと呼ばれる内部欠陥が生じ始め、硬さも硬
くなりすぎ難剤となるので好ましくない。アンチ
モンとともに銅を添加することはひけ量減少を助
長し、またアンチモンによるチル化傾向を抑制
し、かつ組織の均一化に役立つ。だだし、銅の添
加が1.0％未満では上記の効果が充分に現れず、
一方、5.0％を越えるとアンチモン多過の場合と
同様な内部欠陥が生じる。なお、本発明では、炭
素、シリコン、マンガンなど、チタン、アンチモ
ン、銅以外の成分については従来の球状黒鉛鋳鉄
の含有量が適用され得る。
以上要するに本発明は、従来球状黒鉛鋳鉄にお
いて望ましくないとされていたアンチモンを、ま
たアンチモンとともに銅を積極的に、かつ適量に
添加含有せしめることによりひけ量が少なく組織
が均一であり、引張強さなど機械的性質のすぐれ
た球状黒鉛鋳鉄を提供するものである。[Table] The above is a representative example of the experiment, but combining the results of the experiments conducted by the inventors, the amount of titanium is 0.3
% or less, and if titanium is added in an amount exceeding 0.03%, even if copper and antimony are added, the effect of reducing the amount of shrinkage cavities cannot be sufficiently exhibited. If the amount of antimony added is less than 0.01%, the effect of reducing the amount of shrinkage cavities will be insufficient, while if it exceeds 0.04%, internal defects commonly known as internal whiskers will begin to occur, and the hardness will become too hard, which is not preferable. Adding copper together with antimony helps to reduce the amount of sinkage, suppresses the chilling tendency caused by antimony, and helps to homogenize the structure. However, if the addition of copper is less than 1.0%, the above effects will not be fully exhibited,
On the other hand, if it exceeds 5.0%, internal defects similar to those caused by excess antimony will occur. In the present invention, the content of conventional spheroidal graphite cast iron may be applied to components other than titanium, antimony, and copper, such as carbon, silicon, and manganese. In summary, the present invention has been achieved by adding antimony, which has conventionally been considered undesirable in spheroidal graphite cast iron, and by actively adding copper along with antimony in an appropriate amount, resulting in a uniform structure with a small amount of sinkage and a high tensile strength. The purpose is to provide spheroidal graphite cast iron with excellent mechanical properties.
第１図はチタン、銅、アンチモン量の球状黒鉛
鋳鉄におけるひけ量との関係を示す図、第２図は
球状黒鉛鋳鉄における黒鉛粒子形状分類を示す図
である。
FIG. 1 is a diagram showing the relationship between the amounts of titanium, copper, and antimony and the sinkage amount in spheroidal graphite cast iron, and FIG. 2 is a diagram showing the graphite particle shape classification in spheroidal graphite cast iron.
Claims (1)
ン、0.8％以下のマンガン、0.2％以下のリン、
0.05％以下の硫黄、0.3％以下のチタン、0.005％
〜0.07％のマグネシウムの他に、0.01％〜0.04％
のアンチモンを含み、残部実質的に鉄であつて黒
鉛球状化率が50％以上であることを特徴とする、
ひけ巣のない均一な組織を有する球状黒鉛鋳鉄。 ２ 2.8％〜4.2％の炭素、1.5％〜4.3％のシリコ
ン、0.8％以下のマンガン、0.2％以下のリン、
0.05％以下の硫黄、0.3％以下のチタン、0.005％
〜0.07％のマグネシウムの他に、0.01％〜0.04％
のアンチモンおよび1.0％〜5.0％の銅を含み、残
部実質的に鉄であつて黒鉛球状化率が50％以上で
あることを特徴とする、ひけ巣のない均一な組織
を有する球状黒鉛鋳鉄。[Claims] 1 2.8% to 4.2% carbon, 1.5% to 4.3% silicon, 0.8% or less manganese, 0.2% or less phosphorus,
Sulfur up to 0.05%, titanium up to 0.3%, 0.005%
~0.07% magnesium, as well as 0.01%~0.04%
of antimony, the remainder being substantially iron, and having a graphite spheroidization rate of 50% or more,
Spheroidal graphite cast iron with a uniform structure without shrinkage cavities. 2 2.8% to 4.2% carbon, 1.5% to 4.3% silicon, 0.8% or less manganese, 0.2% or less phosphorus,
Sulfur up to 0.05%, titanium up to 0.3%, 0.005%
~0.07% magnesium, as well as 0.01%~0.04%
A spheroidal graphite cast iron having a uniform structure without shrinkage cavities, containing antimony and 1.0% to 5.0% copper, the remainder being substantially iron, and having a graphite nodularity of 50% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52582A JPS57137450A (en) | 1982-01-04 | 1982-01-04 | Spheroidal graphite cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP52582A JPS57137450A (en) | 1982-01-04 | 1982-01-04 | Spheroidal graphite cast iron |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6638477A Division JPS541224A (en) | 1977-06-06 | 1977-06-06 | Nodular graphite cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57137450A JPS57137450A (en) | 1982-08-25 |
| JPS6112982B2 true JPS6112982B2 (en) | 1986-04-11 |
Family
ID=11476177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP52582A Granted JPS57137450A (en) | 1982-01-04 | 1982-01-04 | Spheroidal graphite cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57137450A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100404765B1 (en) * | 2001-09-19 | 2003-11-12 | 엘지전자 주식회사 | Fabrication method of micro-alloyed ferritic cast iron with finely distributed graphite |
| JP2006198650A (en) * | 2005-01-19 | 2006-08-03 | Bridgestone Corp | Composition for tire mold casting equipment |
| CN102268590A (en) * | 2011-07-07 | 2011-12-07 | 无锡小天鹅精密铸造有限公司 | Smelting ingredient of nodular iron crankshaft |
| CN109023030A (en) * | 2018-08-27 | 2018-12-18 | 安徽大来机械制造有限公司 | A kind of processing method of modified ductile cast iron manhole cover |
-
1982
- 1982-01-04 JP JP52582A patent/JPS57137450A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57137450A (en) | 1982-08-25 |
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