JPS62142745A - Heat-resistant spheroidal graphite cast iron - Google Patents

Heat-resistant spheroidal graphite cast iron

Info

Publication number
JPS62142745A
JPS62142745A JP28368185A JP28368185A JPS62142745A JP S62142745 A JPS62142745 A JP S62142745A JP 28368185 A JP28368185 A JP 28368185A JP 28368185 A JP28368185 A JP 28368185A JP S62142745 A JPS62142745 A JP S62142745A
Authority
JP
Japan
Prior art keywords
cast iron
graphite cast
heat
spheroidal graphite
resistant spheroidal
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.)
Granted
Application number
JP28368185A
Other languages
Japanese (ja)
Other versions
JPH0524977B2 (en
Inventor
Masami Suzuki
鈴木 正実
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP28368185A priority Critical patent/JPS62142745A/en
Publication of JPS62142745A publication Critical patent/JPS62142745A/en
Publication of JPH0524977B2 publication Critical patent/JPH0524977B2/ja
Granted legal-status Critical Current

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  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

PURPOSE:To obtain heat-resistant spheroidal graphite cast iron having thermal fatigue characteristics and oxidation resistance particularly higher than those of conventional heat-resistant spheroidal graphite cast iron, by providing a composition containing C, Si, Mn, P, S, Cr, Nb or/and Ta, and graphite- spheroidizing elements such as Mg, Ca, Ce, etc., each of prescribed quantity. CONSTITUTION:The heat-resistant spheroidal graphite cast iron has a composition containing, by weight ratio, 3.2-4.2% C, 3.5-4.5% Si, <=0.8% Mn, <=0.1% P, <=0.03% S, 0.2-0.8% Cr, 0.5-2.0% Nb or/and Ta, and required amounts of graphite-spheroidizing elements such as Mg, Ca, Ce, etc. mechanically, above- mentioned graphite cast iron of this invention has a composition in which the amounts of impurities such as P, S, etc., are controlled to low values and the additive quantities of C, Si, Cr, and Nb are well balanced. Accordingly, the above graphite cast iron has thermal fatigue characteristics and oxidation resistance particularly superior to those of conventional heat-resistant spheroidal graphite cast iron and combines castability with machinability.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、耐熱性球状黒鉛鋳鉄にかかり、特に車両用
エンジンの排気系部品等に使用ずろのに好適な耐熱性球
状黒鉛鋳鉄の改良に関するものである。
[Detailed Description of the Invention] [Industrial Application Field] This invention relates to heat-resistant spheroidal graphite cast iron, and in particular to improvements in heat-resistant spheroidal graphite cast iron suitable for use in exhaust system parts of vehicle engines. It is something.

(従来の技術〕 近年、ガソリンエンジンもしくはディーゼルエンジン等
の車両用エンジン、特に自動車用エンジンにおいては、
高出力化、低燃費化に対する改善要求の高まりに伴い、
燃焼効率の改善のための研究開発が積極的に実施されて
いる。
(Prior Art) In recent years, in vehicle engines such as gasoline engines or diesel engines, especially automobile engines,
With the increasing demand for improvements in higher output and lower fuel consumption,
Research and development is actively being carried out to improve combustion efficiency.

その結果、このような要求に応える自動車用エンジンに
おいては、従来の自動車用エンジンに比較して、排気ガ
ス温度が著しく高温となる傾向にある。
As a result, in automobile engines that meet such demands, the exhaust gas temperature tends to be significantly higher than that of conventional automobile engines.

とりわけ、自動車用エンジンにおけるエキゾーストマニ
ホルド、ターボチャージャ用タービンハウジング、排気
ガス浄化装置用部品等の排気系部品においては、使用条
件が特に高温苛酷となることから、従来の高Si球状黒
鉛鋳鉄の耐熱性をさらに向上させるため、Cr、Ajl
!、MOあるいはCe、しa等の希土類元素の添加が試
みられてきた。
In particular, exhaust system parts such as exhaust manifolds in automobile engines, turbine housings for turbochargers, and parts for exhaust gas purification systems are used under particularly high and harsh conditions, so the heat resistance of conventional high-Si spheroidal graphite cast iron is In order to further improve Cr, Ajl
! Attempts have been made to add rare earth elements such as , MO, Ce, and a.

すなわち、鋳物第49巻第12号の第42頁には鋳鉄の
耐熱性を向上させる方法として、MOlCr、Mn、A
ll、S i等の合金元素の添加が試みられていること
が開示されている。
In other words, on page 42 of Cast Iron Vol.
It is disclosed that attempts have been made to add alloying elements such as ll and Si.

また、出願人は先に出!!Jj L、た特公昭54−3
89(38号の中で鋳鉄にS I、M n 、M gを
添加した排気マニホルドを開示している。
Also, applicants should submit first! ! Jj L, Tokuko Sho 54-3
No. 89 (No. 38) discloses an exhaust manifold in which S I, M n , and M g are added to cast iron.

また、特公昭60−17819号にはMo、Ce、1−
、Jの含有か開示され、特開昭58−58248号には
Cr、Moの含有が開示されている。
In addition, Mo, Ce, 1-
, J is disclosed, and JP-A-58-58248 discloses the inclusion of Cr and Mo.

さらに、特開昭6O−70162WにもMoの含有が開
示され、特開昭48−31113号にはA1を含有した
球状黒鉛鋳鉄が開示されている。
Further, JP-A-6O-70162W also discloses the inclusion of Mo, and JP-A-48-31113 discloses spheroidal graphite cast iron containing A1.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

ところで、高Si球状黒鉛鋳鉄の性質を改善するために
は、特に耐酸化性と熱疲労特性を同時に向」二させると
ともに、鋳造性と加工性を悪化させないことが必要であ
る。
By the way, in order to improve the properties of high-Si spheroidal graphite cast iron, it is particularly necessary to simultaneously improve oxidation resistance and thermal fatigue properties, and not to deteriorate castability and workability.

しかしながら、従来の耐熱性の向上の方法には以下のよ
うな問題かあった。
However, conventional methods for improving heat resistance have the following problems.

Si含有量を高めることは耐酸化性を向上させるが、フ
ェライト基地を脆化させ熱疲労特性を悪化させる。
Increasing the Si content improves oxidation resistance, but embrittles the ferrite base and deteriorates thermal fatigue properties.

また、CrあるいはA2を含有させることも耐酸化性を
向」−させるが、Crは網状の1次炭化物を析出させ被
削性を著しく低−ドさせ、またAρは溶湯の流動性を低
ドさせ鋳造性を著しく悪化させる。
In addition, the inclusion of Cr or A2 also improves oxidation resistance, but Cr precipitates network-like primary carbides and significantly reduces machinability, and Aρ reduces the fluidity of the molten metal. This significantly deteriorates castability.

また、Moは基地を強化して熱疲労特性を向上させるが
、Crと同様網状の1次炭化物を析出させ被削性を著し
く低下させるとともに、引は巣の発生を増加させ易い。
Furthermore, Mo strengthens the matrix and improves thermal fatigue properties, but like Cr, it precipitates network-like primary carbides, significantly lowering machinability, and tends to increase the occurrence of shrinkage cavities.

さらに、希土類元素の添加は酸化スケールの密着性を良
くして耐酸化性を向トさせるが、熱疲労特性を向上させ
る効果が小さいという問題がある。
Furthermore, although the addition of rare earth elements improves the adhesion of oxide scale and improves oxidation resistance, there is a problem that the effect of improving thermal fatigue properties is small.

従って、本発明の目的は、従来の耐熱性球状黒鉛鋳鉄よ
りも格段にすぐれた熱疲労特性と耐酸化性を有するとと
もに、鋳造性と機械加工性を兼ね備えた耐熱性球状黒鉛
鋳鉄を提供することにある。
Therefore, an object of the present invention is to provide a heat-resistant spheroidal graphite cast iron that has significantly superior thermal fatigue properties and oxidation resistance than conventional heat-resistant spheroidal graphite cast iron, and also has both castability and machinability. It is in.

〔問題点を解決するための手段〕[Means for solving problems]

このため、本発明にかかる耐熱性球状黒鉛鋳鉄は、重量
比率で、C,3,2〜4.2%+  s’ ;3、 5
〜4. 5%、Mn;0.8%以下、Pro。
Therefore, the heat-resistant spheroidal graphite cast iron according to the present invention has a weight ratio of C, 3,2 to 4.2% + s'; 3,5.
~4. 5%, Mn; 0.8% or less, Pro.

1%以下、sho、03%以下、Cr;0,2〜0.8
%、Nb、’l’aのうら少なくとも1種類を0.5〜
2.0%9Mg、Ca、Ce等の黒鉛球状化元素を黒鉛
の球状化のために必要な量含有し、残部実質的にドCと
不可避の不純物からなることを特徴とするものである。
1% or less, sho, 03% or less, Cr; 0.2 to 0.8
%, Nb, at least one type of 'l'a from 0.5 to
It is characterized in that it contains graphite spheroidizing elements such as 2.0% 9Mg, Ca, and Ce in an amount necessary for spheroidizing graphite, and the remainder essentially consists of carbon and inevitable impurities.

〔作用〕[Effect]

上記の構成にかかる本発明の詳細な説明すると、本発明
にかかる耐熱性球状黒鉛鋳鉄を組成的にはI七 S等の
不純物を低(抑える一方、C,Si。
To explain in detail the present invention according to the above configuration, the heat-resistant spheroidal graphite cast iron according to the present invention has a composition with low impurities such as I7 and S, while containing C and Si.

Cr、Nbをバランスよく添加したことにより、従来の
耐熱性球状黒鉛鋳鉄よりも格段にすぐれた熱疲労特性と
耐酸化性を有するとともに、鋳造性と機械加工性を兼ね
備えた耐熱性球状黒鉛鋳鉄を提供することができたので
ある。
By adding Cr and Nb in a well-balanced manner, we have created a heat-resistant spheroidal graphite cast iron that has far superior thermal fatigue properties and oxidation resistance than conventional heat-resistant spheroidal graphite cast iron, and has both castability and machinability. was able to provide it.

以下、本発明の耐熱性球状黒鉛鋳鉄に添加する各合金元
素の添加量の範囲限定理由について説明する。
The reason for limiting the range of the amount of each alloying element added to the heat-resistant spheroidal graphite cast iron of the present invention will be explained below.

なお、以下の説明において各合金元素の添加量は全て重
用%で表示する。
In the following description, the amount of each alloying element added is expressed in weight percentage.

まず、Cは3.2%未満では鋳造性が悪化し、4.2%
を超えると黒鉛量が多くなり材質を脆弱化させるため、
3.2〜4.2%とした。
First, if C is less than 3.2%, castability deteriorates;
Exceeding this will increase the amount of graphite and make the material brittle.
It was set at 3.2 to 4.2%.

Siは高温における耐酸化性を向上させるためには3.
5%以上必要であるが、4.5%を超えると基地力」電
属化して熱疲労特性を著しく低下させるため、3.5〜
4.5%とした。
3. Si is used to improve oxidation resistance at high temperatures.
5% or more is required, but if it exceeds 4.5%, the base force will become electric and the thermal fatigue properties will deteriorate significantly, so 3.5~
It was set at 4.5%.

また、Mnは溶解原料から不可避的に混入するSの害毒
をMnSとして無害な形に固定するために有効な元素で
あるが、0.8%を超えると耐酸化性を悪化させるため
0.8%とした。
In addition, Mn is an effective element for fixing the poisonous S, which is unavoidably mixed in from the melted raw materials, into a harmless form as MnS, but if it exceeds 0.8%, the oxidation resistance deteriorates. %.

Pはやはり溶解原料から不可避的に混入するが、多量に
混入すると被削性を悪化させるステダイトを晶出させる
ため、その影響が無視できる程度の0.1%以下とした
P is unavoidably mixed in from the melted raw material, but since it crystallizes steadite, which deteriorates machinability when mixed in a large amount, the amount was set to 0.1% or less so that its influence can be ignored.

また、Sも溶解原料から不可避的に混入するが、多量に
混入すると黒鉛の球状化を阻害するため、やはりその影
響が無視できる程度の0.03%以下とした。
Further, S is also inevitably mixed in from the melted raw material, but if it is mixed in a large amount, it will inhibit the spheroidization of graphite, so it was set to 0.03% or less, so that its influence can be ignored.

Crは耐酸化性の向上に有効であるが0.2%未満では
その効果が十分でなく、0.8%を超えて添加するとN
bの含fillとの関係でCrの1次炭化物を粗大化さ
せて機械加工性を著しく悪化させるため、0.2〜0.
8%とした。
Cr is effective in improving oxidation resistance, but if it is less than 0.2%, the effect is not sufficient, and if it is added in excess of 0.8%, N
In relation to the fill content of b, the primary carbide of Cr becomes coarse and the machinability is significantly deteriorated, so it is 0.2 to 0.
It was set at 8%.

Nb、Taは本発明において特に重要な合金元素であっ
て共に同様な作用を有する。すなわち、鋳造時にCrよ
りも優先的に微細な粒状炭化物を形成し、機械加工性を
悪化させるCrの網状1次炭化物の形成を抑制する。
Nb and Ta are particularly important alloying elements in the present invention, and both have similar effects. That is, fine granular carbide is preferentially formed over Cr during casting, and the formation of Cr network primary carbide, which deteriorates machinability, is suppressed.

また、高温におけるC r O) 2次炭化物の析出を
抑制するため耐酸化性の向上に有効であるが、0゜5%
未満ではそれらの緒特性の改善効果が十分でなく、一方
2.0%を超えて添加するとNbあるいはT aが未溶
解状態で基地中に残留して靭性を低下させ易いため、0
゜5〜2.0%とした。
In addition, it is effective in improving oxidation resistance because it suppresses the precipitation of secondary carbides (CrO) at high temperatures;
If it is less than 2.0%, the effect of improving these properties will not be sufficient, while if it is added in excess of 2.0%, Nb or Ta will remain in the matrix in an undissolved state and tend to reduce the toughness.
゜5% to 2.0%.

〔実施例〕〔Example〕

以下、本発明の一実施例を添付図面を参照して詳細に説
明する。
Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

本発明材の各種の特性を評価するために、第1表に示す
ような4種類の本発明材■〜■および4種類の比較材■
〜■の供試材を鋳造成形により製造した。
In order to evaluate various properties of the present invention materials, four types of the present invention materials ■ to ■ and four types of comparative materials ■ as shown in Table 1 were used.
Test materials of ~■ were manufactured by casting.

なお、各供試材の鋳造成形にあたっては50kg川高周
被溶解炉を使用して人気溶解し、1550℃以上で出湯
し取鍋中にてl=’e−3i  MU金合金より黒鉛球
状化処理を行った。
In addition, when casting and forming each test material, a 50 kg Kawakoshu melting furnace was used for melting, and the hot water was tapped at 1550°C or higher and graphite was spheroidized from l='e-3i MU gold alloy in a ladle. processed.

その後、これをF’ e −S i合金にて接種後14
40℃以上で注湯し、JIS規格A号のYブロック形状
に鋳造成形した。このようにして製造した各供試材の化
学組成を第1表に示した。
After that, this was inoculated with F' e -S i alloy and 14
Molten metal was poured at 40° C. or higher and cast into a Y block shape according to JIS standard A. The chemical composition of each sample material thus produced is shown in Table 1.

第1表 鋤 第1表に示すような組成を有する各供試材を使用して、
以下に述べるような各種の評価試験を実施した。
Table 1 Plow Using each sample material having the composition shown in Table 1,
Various evaluation tests were conducted as described below.

ます、電気−油圧サーボ方式熱疲労試験機を使用して、
上記の各供試材に対して熱疲労試験を実施した。
First, using an electro-hydraulic servo type thermal fatigue testing machine,
A thermal fatigue test was conducted on each of the above sample materials.

なお、熱疲労試験は標点間距離を151m、標点間径を
lOwφとした丸棒試験片を使用して、試験片の加熱に
よる伸びおよび冷却による収縮を機械的に拘束させた状
態で、下限温度を200℃、上限温度を900℃とし、
■サイクル10分として加熱冷却サイクルの繰り返しに
より熱疲労破壊させた。
The thermal fatigue test used a round bar test piece with a gauge distance of 151 m and a gauge diameter of lOwφ, with the test piece mechanically restrained from elongation due to heating and contraction due to cooling. The lower limit temperature is 200℃, the upper limit temperature is 900℃,
(2) Thermal fatigue failure was caused by repeating heating and cooling cycles for 10 minutes.

そして、各試験片に負荷させる加熱冷却サイクルを上記
のように一定とし各試験片の拘束率を変化させて、各供
試材の拘束率と熱疲労による破壊までの繰り返し数(回
)との関係によって、各供試材の熱疲労特性を評価した
。ここで、拘束率(%)は次の弐により求められる値で
ある。
Then, by keeping the heating and cooling cycle applied to each test piece constant as described above and varying the restraint rate of each test piece, we calculated the relationship between the restraint rate of each specimen and the number of repetitions (times) until failure due to thermal fatigue. The thermal fatigue properties of each sample material were evaluated based on the relationship. Here, the restraint rate (%) is a value obtained from the following 2.

自由伸び一拘束伸び 拘束率(%’)=            X100自
由伸び このようにして熱疲労試験した結果を第1図に示した。
Free elongation - restrained elongation restraint ratio (%') = X100 free elongation The results of the thermal fatigue test conducted in this manner are shown in FIG.

第1図から明らかなように、本発明材■〜■はいずれも
従来材である4種類の比較材■〜■と比較すると、熱疲
労寿命が格段にすくれていることがわかる。
As is clear from FIG. 1, it can be seen that the thermal fatigue life of the inventive materials (1) to (2) is significantly shorter than that of the four comparative materials (1) to (2), which are conventional materials.

次に、耐酸化性を評価するために、鋳造成形された上記
の組成を有する各供試材を使用して、3Q am X 
20 am X 5 amの形状の板状試験片を製作し
、900℃において100時間の大気中保持による酸化
試験を実施した。
Next, in order to evaluate the oxidation resistance, each test material having the above-mentioned composition was cast, and 3Q am
A plate-shaped test piece with a size of 20 am x 5 am was prepared, and an oxidation test was conducted by holding it in the air at 900° C. for 100 hours.

なお、この酸化試験における試験結果は酸化試験後にシ
ョツトブラスト処理を施して酸化スケールを除去し、酸
化試験前後の単位面積当たりの重量変化(酸化ftl;
■/cm” )を求めることにより評価した。
The test results of this oxidation test were determined by performing shot blasting after the oxidation test to remove oxide scale, and calculating the weight change per unit area (oxidation ftl;
The evaluation was made by determining the ratio (■/cm").

上記の方法により酸化試験した結果を第2図に示した。The results of the oxidation test performed by the above method are shown in FIG.

第2図から明らかなように、本発明材■〜■はいずれも
従来材である比較材■〜■と比較すると酸化減量が少な
くとも約半分以下であり、耐酸化性が格段にすぐれてい
ることがわかる。
As is clear from Figure 2, the oxidation loss of all of the inventive materials ■ to ■ is at least about half that of the conventional materials comparative materials ■ to ■, and their oxidation resistance is significantly superior. I understand.

次に、鋳造性、機械カロエ性を評価するために本発明材
を使用してエキゾーストマニホルドを鋳造成形によって
製造した。
Next, an exhaust manifold was manufactured by casting using the material of the present invention in order to evaluate castability and mechanical corrosion resistance.

その結果、“ひけ巣′、“ピンホール”、“ブローホー
ル”、“砂かみ”、“湯廻り不良゛、“湯境°′等とい
った鋳造不良を生しることなく成形でき、良好な鋳造性
を有していることが’4.i LF、2できた。
As a result, molding can be performed without causing casting defects such as "sinkage cavities,""pinholes,""blowholes,""sandholes,""poor hot water circulation," and "hot water gaps," resulting in good casting. '4.i LF, 2 was able to have sex.

そして、次にこれにドリル加工、フライス加工等の機械
加工を施したところ、刃具の欠けあるいは異常摩耗を生
じることもなく、従来の高Si球状黒鉛鋳鉄と同等の機
械加工性を有していることが確認できた。
When this material is then subjected to machining processes such as drilling and milling, there is no chipping or abnormal wear of the cutting tools, and it has machinability equivalent to that of conventional high-Si spheroidal graphite cast iron. This was confirmed.

次に、耐熱耐久性を評価するために本発明材および比較
材を使用して2.81ガソリンエンジン用のエキゾース
トマニホルドを製作し、実際にエンジンに搭載してエン
ジン台上苛酷耐久試験を行った。
Next, in order to evaluate heat resistance and durability, an exhaust manifold for a 2.81 gasoline engine was manufactured using the present invention material and a comparative material, and was actually mounted on the engine and subjected to a severe on-board engine durability test. .

第2表にこのエンジン台上苛酷耐久試験に使用したエキ
ゾーストマニホルドの各供試品の化学組成を示した。
Table 2 shows the chemical composition of each exhaust manifold sample used in this engine bench severe durability test.

なお、比較、近は従来の高Si球状黒鉛鋳鉄である。For comparison, the conventional high-Si spheroidal graphite cast iron is used.

第1表 試験条件は最高回転数を560Orpmとして全負荷条
件での冷熱サイクル耐久を900サイクルまで実施し、
熱亀裂の発生の有無によってエキソ−ストマニホルドの
耐久性を評価した。
The test conditions in Table 1 are as follows: Maximum rotation speed is 560 Orpm, and cold and heat cycle durability is carried out under full load conditions up to 900 cycles.
The durability of the exhaust manifold was evaluated based on the presence or absence of thermal cracks.

この結果、本発明品は900サイクルの試験終了まで熱
亀裂の発生が認められなかったのに対して、比較品は6
30サイクルで肉厚を貫通する熱亀裂の発生が認められ
た。
As a result, the product of the present invention showed no thermal cracking until the end of the 900-cycle test, whereas the comparative product showed no thermal cracking until the end of the 900-cycle test.
Thermal cracks penetrating the wall thickness were observed to occur after 30 cycles.

以」二の結果より、本発明材によって製造されたエキゾ
ーストマニホルドは熱負荷の厳しい条件下において十分
な熱亀裂耐久性を有していることが明らかになった。
From the above two results, it has been revealed that the exhaust manifold manufactured using the material of the present invention has sufficient thermal cracking durability under severe heat load conditions.

以上、本発明を特定の実施例に暴づいて説明したがこれ
に限定されるものでばス(<、特許請求の範囲に記載し
た範囲内で当業者が実施可能な種々の別な態様が考えら
れる。
Although the present invention has been described above with reference to specific embodiments, it is understood that the present invention is not limited thereto. Conceivable.

例えば、上記の実施例においてはNbのみ含有された例
について説明したが、Nbとi’ aは精錬過程で分離
が困難であるためNbと′1゛aは実實的には同時に含
有される。
For example, in the above embodiment, an example was explained in which only Nb was contained, but since Nb and i'a are difficult to separate in the refining process, Nb and '1'a are actually contained at the same time. .

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明にかかる耐熱性球状黒鉛鋳
鉄は、組成的にばP、S等の不純物を低く抑える一方、
C,Si、Cr、Nbをバランスよく添加したことによ
り、従来の耐熱性球状黒鉛鋳鉄よりも格段Gこすぐれた
熱疲労特性と耐酸化性を有するとともに、鋳造性と機械
加工性を兼ね備えることができた。
As explained above, the heat-resistant spheroidal graphite cast iron according to the present invention suppresses impurities such as P and S to a low level in terms of composition, while
By adding C, Si, Cr, and Nb in a well-balanced manner, it has thermal fatigue properties and oxidation resistance that are significantly better than conventional heat-resistant spheroidal graphite cast iron, and it also has both castability and machinability. did it.

これによって、自動車用エンジンにおける排気系部品用
材料、例えばエキゾーストマニホルド等に通用できると
いうすぐれた効果を奏する。
This provides an excellent effect in that it can be used as a material for exhaust system parts in automobile engines, such as exhaust manifolds.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明材と比較材の熱疲労試験の結果を示すグ
ラフ、第2図は本発明材と比較材の酸化試験の結果を示
すグラフである。 出願人  トヨタ自動車株式会社 纂 1 毘二
FIG. 1 is a graph showing the results of a thermal fatigue test of the present invention material and the comparative material, and FIG. 2 is a graph showing the oxidation test results of the present invention material and the comparative material. Applicant Toyota Motor Corporation Collection 1 Biji

Claims (1)

【特許請求の範囲】[Claims] 重量比率で、C;3.2〜4.2%、Si;3.5〜4
.5%、Mn;0.8%以下、P;0.1%以下、S;
0.03%以下、Cr;0.2〜0.8%、Nb、Ta
のうち少なくとも1種類を0.5〜2.0%、Mg、C
a、Ce等の黒鉛球状化元素を黒鉛の球状化のために必
要な量含有し、残部実質的にFeと不可避の不純物から
なることを特徴とする耐熱性球状黒鉛鋳鉄。
In terms of weight ratio, C: 3.2-4.2%, Si: 3.5-4
.. 5%, Mn; 0.8% or less, P; 0.1% or less, S;
0.03% or less, Cr; 0.2-0.8%, Nb, Ta
0.5 to 2.0% of at least one of these, Mg, C
A heat-resistant spheroidal graphite cast iron, characterized in that it contains a graphite spheroidizing element such as a, Ce, etc. in an amount necessary for spheroidizing graphite, and the remainder substantially consists of Fe and unavoidable impurities.
JP28368185A 1985-12-17 1985-12-17 Heat-resistant spheroidal graphite cast iron Granted JPS62142745A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28368185A JPS62142745A (en) 1985-12-17 1985-12-17 Heat-resistant spheroidal graphite cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28368185A JPS62142745A (en) 1985-12-17 1985-12-17 Heat-resistant spheroidal graphite cast iron

Publications (2)

Publication Number Publication Date
JPS62142745A true JPS62142745A (en) 1987-06-26
JPH0524977B2 JPH0524977B2 (en) 1993-04-09

Family

ID=17668691

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28368185A Granted JPS62142745A (en) 1985-12-17 1985-12-17 Heat-resistant spheroidal graphite cast iron

Country Status (1)

Country Link
JP (1) JPS62142745A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05846U (en) * 1991-06-20 1993-01-08 株式会社共栄建機 Floor material stripping machine and stripping blade structure thereof
WO2007040464A1 (en) * 2005-09-15 2007-04-12 Grede Foundries, Inc. High silicon niobium casting alloy and process for producing the same
WO2010070949A1 (en) * 2008-12-18 2010-06-24 三菱重工業株式会社 Spheroidal graphite cast iron
RU2615916C1 (en) * 2016-04-19 2017-04-11 Юлия Алексеевна Щепочкина Cast iron

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05846U (en) * 1991-06-20 1993-01-08 株式会社共栄建機 Floor material stripping machine and stripping blade structure thereof
WO2007040464A1 (en) * 2005-09-15 2007-04-12 Grede Foundries, Inc. High silicon niobium casting alloy and process for producing the same
JP2009509035A (en) * 2005-09-15 2009-03-05 グリード・ファウンドリーズ・インコーポレイテッド High silicon niobium casting alloy and method for producing the same
US8012410B2 (en) 2005-09-15 2011-09-06 Grede Llc High silicon niobium casting alloy and process for producing the same
WO2010070949A1 (en) * 2008-12-18 2010-06-24 三菱重工業株式会社 Spheroidal graphite cast iron
JP2010144216A (en) * 2008-12-18 2010-07-01 Mitsubishi Heavy Ind Ltd Spheroidal graphite cast iron
EP2377960B1 (en) 2008-12-18 2018-09-26 Mitsubishi Heavy Industries, Ltd. Spheroidal graphite cast iron
RU2615916C1 (en) * 2016-04-19 2017-04-11 Юлия Алексеевна Щепочкина Cast iron

Also Published As

Publication number Publication date
JPH0524977B2 (en) 1993-04-09

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