JPH06128685A - Heat resistant cast iron - Google Patents
Heat resistant cast ironInfo
- Publication number
- JPH06128685A JPH06128685A JP5122294A JP12229493A JPH06128685A JP H06128685 A JPH06128685 A JP H06128685A JP 5122294 A JP5122294 A JP 5122294A JP 12229493 A JP12229493 A JP 12229493A JP H06128685 A JPH06128685 A JP H06128685A
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- cast iron
- heating
- heat resistance
- test
- sample
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、例えば、自動車の排
気系における鋳物部品のように繰り返し加熱を受ける鋳
物品に好適な耐熱性鋳鉄に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat resistant cast iron suitable for a cast article which is repeatedly heated, such as a cast part in an exhaust system of an automobile.
【０００２】[0002]
【従来の技術】鋳鉄の耐熱性は、一般的に加熱試験によ
り測定される酸化減量により評価されており、この種の
繰り返し加熱を受ける鋳物品においても、酸化減量はそ
の耐熱性を評価するうえでの重要な要素である。2. Description of the Related Art The heat resistance of cast iron is generally evaluated by the oxidation weight loss measured by a heating test. Even in a cast article which is repeatedly heated by this kind, the oxidation weight loss is used to evaluate the heat resistance. Is an important factor in.
【０００３】そのため、この種の繰り返し加熱を受ける
鋳鉄品に用いられる耐熱性鋳鉄の選択は、前記酸化減量
を判断の基準として行なわれ、この酸化減量の良好な材
料として、例えば多量のNiを含んだ耐熱性球状黒鉛鋳鉄
が一般に広く用いられており、またこの種の耐熱性球状
黒鉛鋳鉄にさらにSiを添加したものも一部で用いられて
いる。Therefore, the heat-resistant cast iron used in the cast iron products subjected to this kind of repeated heating is selected based on the above-mentioned oxidation weight loss as a criterion, and as a material having a good oxidation weight loss, for example, a large amount of Ni is contained. The heat-resistant spheroidal graphite cast iron is generally widely used, and a part of this kind of heat-resistant spheroidal graphite cast iron to which Si is further added is also used.
【０００４】[0004]
【発明が解決しようとする課題】ところで、繰り返し加
熱を受ける鋳物品においては、その耐久性の改善を図る
うえでは、単に酸化減量が良好であるばかりでなく、そ
の繰り返し加熱による熱応力に対する良好な耐性を有す
ることが好ましいものと考えられる。By the way, in a cast article which is repeatedly heated, in order to improve its durability, not only the oxidation weight loss is good, but also the thermal stress due to the repeated heating is good. It is considered preferable to have resistance.
【０００５】しかしながら、従来のこの種の繰り返し加
熱を受ける鋳物品においては、かかる観点からの検討が
あまりなされておらず、繰り返し加熱であることによる
鋳物品への熱応力の影響がほとんど積極的には考慮され
ていないのが現状である。However, in the conventional cast article which is subjected to this type of repeated heating, there has not been much study from such a viewpoint, and the influence of thermal stress on the cast article due to the repeated heating is almost positive. Is currently not considered.
【０００６】また、発明者らの研究によれば、とくに1
3.0〜40.0％の多量のNiが添加された耐熱鋳鉄において
は、添加すべきSi量を3.0〜10.0％とすることにより、
低コストでその耐熱性を一層向上させることができる。Further, according to the research conducted by the inventors, in particular,
In heat-resistant cast iron to which a large amount of Ni of 3.0 to 40.0% was added, by setting the amount of Si to be added to 3.0 to 10.0%,
The heat resistance can be further improved at low cost.
【０００７】この発明は、このような背景に基づいてな
されたもので、13.0〜40.0％の多量のNiが添加された鋳
鉄材料に、耐熱性と熱応力に対する良好な耐性とを具備
させて、繰り返し加熱を受ける鋳物品の耐久性を改善す
ることを目的とするものである。The present invention has been made based on such a background, and a cast iron material containing a large amount of Ni of 13.0 to 40.0% is provided with heat resistance and good resistance to thermal stress. It is intended to improve the durability of a cast article that is repeatedly heated.
【０００８】[0008]
【課題を解決するための手段】この目的を達成するため
に、請求項１記載の発明は、繰り返し加熱を受ける鋳鉄
であって、13.0〜40.0％のNiと、3.5〜7.0％のSiとを添
加したことを特徴とする。In order to achieve this object, the invention according to claim 1 is cast iron which is repeatedly heated, and contains 13.0 to 40.0% Ni and 3.5 to 7.0% Si. It is characterized by being added.
【０００９】[0009]
【作用】鋳鉄に、13.0〜40.0％のNiと所定量のSiとが添
加されているので、その鋳物の耐熱性は良好である。[Operation] Since 13.0 to 40.0% of Ni and a predetermined amount of Si are added to cast iron, the heat resistance of the cast iron is good.
【００１０】そして、この場合にSi量が3.5〜7.0％の範
囲内であり、この範囲の成分組成からなる鋳鉄材料は、
繰り返し熱応力試験の結果からみて熱応力の集中に対す
る良好な耐性を有する鋳鉄材料である。In this case, the cast iron material containing Si in the range of 3.5 to 7.0% and having a composition in this range is
It is a cast iron material having good resistance to the concentration of thermal stress in view of the results of repeated thermal stress tests.
【００１１】したがって、請求項１記載の耐熱性鋳鉄
は、耐熱性と熱応力に対する良好な耐性とを具備し、繰
り返し加熱を受ける鋳物品の耐久性を高めることができ
る。Therefore, the heat-resistant cast iron according to claim 1 has heat resistance and good resistance to thermal stress, and can enhance the durability of the cast article that is repeatedly heated.
【００１２】[0012]
【実施例】以下、実施例を説明するが、まず第１の実験
について述べる。EXAMPLES Examples will be described below. First, the first experiment will be described.
【００１３】この第１の実験は、13.0〜40.0％のNiが添
加された，高Ni鋳鉄の耐熱性について主に添加されたSi
量によりどのように向上するかを酸化減量で調査するも
ので、表．１にこの第１の実験に用いる各試料の成分組
成を重量％で示す。This first experiment was conducted mainly on the heat resistance of high Ni cast iron containing 13.0 to 40.0% of Ni.
The amount of oxidative loss is investigated to see how the amount improves. 1 shows the component composition of each sample used in this first experiment in% by weight.
【００１４】[0014]
【表．１】 前記表．１において、試料１−１は比較例としての従来
公知の高Ni鋳鉄であって、いわゆるニレジストダクタイ
ル鋳鉄のＤ2種（ASTM A439のD-2,JIS FCDA-NiCr20 2相
当）である。【table. 1] The above table. In No. 1, sample 1-1 is a conventionally known high Ni cast iron as a comparative example, which is a so-called Niresist ductile cast iron type D2 (ASTM A439 D-2, JIS FCDA-NiCr202 equivalent).
【００１５】試料１−２から試料１−８は、いずれもこ
の発明の実施例であり、試料１−２は添加元素としての
Si量をとくに高めたもので、試料１−３は添加元素とし
てのNi量を高めたものである。Samples 1-2 to 1-8 are all examples of the present invention, and sample 1-2 is an additive element.
The amount of Si is particularly increased, and Samples 1-3 are those in which the amount of Ni as an additional element is increased.
【００１６】また、試料１−４はSi量をすこし高めたう
えで添加元素としてのNi量をすこし減量して添加したも
ので、試料１−５〜１−８は前記試料２と同様の趣旨の
下に添加したSi量を変化させたものである。Samples 1-4 were obtained by slightly increasing the amount of Si and then slightly reducing the amount of Ni as an additional element. Samples 1-5 to 1-8 have the same effect as the sample 2. The amount of Si added underneath is changed.
【００１７】これらの成分組成からなる鋳物の耐熱性を
評価するために、前記各試料１−１〜１−８のそれぞれ
を同一条件で溶解し、所定の金型に注湯して一定形状の
鋳物を形成し、この鋳物の黒皮部分を除いた内部から所
定の直方体形状に切りだして耐熱性試験用テストピース
を作成した。In order to evaluate the heat resistance of a casting having these component compositions, each of the samples 1-1 to 1-8 was melted under the same conditions and poured into a predetermined mold to obtain a fixed shape. A casting was formed, and a test piece for heat resistance test was prepared by cutting the casting into a predetermined rectangular parallelepiped shape from the inside excluding the black skin portion.
【００１８】このようにして用意された耐熱性試験用の
各テストピースにおいては、いずれもその全体に渡って
成分組成が均質に分布した状態である。In each of the test pieces for the heat resistance test thus prepared, the component composition is uniformly distributed over the whole.
【００１９】このような各試料を用いての耐熱性の評価
試験は次のようである。The heat resistance evaluation test using each of these samples is as follows.
【００２０】すなわち、この耐熱性の評価試験として
は、大気中において次のような加熱保持試験と繰り返し
加熱試験とを行なった。That is, as the heat resistance evaluation test, the following heat retention test and repeated heat test were performed in the atmosphere.
【００２１】加熱保持試験は、加熱炉中において、所定
の直方体形状に形成された各テストピースを均一に加熱
して一定温度で一定時間保持させた後、各テストピース
の質量を測定して酸化減量を得るものであり、この加熱
保持試験においては加熱温度を900℃とし、加熱保持時
間を4時間，および20時間としてそれぞれの時点での酸
化減量を得た。In the heating and holding test, each test piece formed in a predetermined rectangular parallelepiped shape is uniformly heated in a heating furnace and held at a constant temperature for a predetermined time, and then the mass of each test piece is measured to oxidize it. In this heating and holding test, the heating temperature was set to 900 ° C., and the heating and holding time was set to 4 hours and 20 hours, and the oxidation weight loss at each time point was obtained.
【００２２】この結果は、図１に示すとおりであり、図
中Ａは加熱保持時間が4時間の時点での酸化減量を示
し、Ｂは20時間の時点での酸化減量を示す。The results are shown in FIG. 1, in which A indicates the oxidation weight loss when the heating and holding time is 4 hours, and B indicates the oxidation weight loss when the heating and holding time is 20 hours.
【００２３】なお、前記試料１−５〜１−８は、前記の
ように試料１−２と同様の趣旨によるものであり、酸化
減量の測定値もほぼ同レベルであったので図示を省略す
る。The samples 1-5 to 1-8 have the same purpose as the sample 1-2 as described above, and the measured values of the oxidation weight loss were almost at the same level, so the illustration thereof is omitted. .
【００２４】図１から理解できるように、加熱保持試験
における酸化減量は、比較例としての試料１−１が最も
大きく、本願の実施例である，試料１−２〜１−４はい
ずれも前記試料１−１より小さい値となっている。そし
て、この酸化減量の差は、加熱時間が長いほど拡大傾向
にあることがわかる。As can be seen from FIG. 1, the oxidation weight loss in the heating and holding test is largest in the sample 1-1 as a comparative example, and the samples 1-2 to 1-4, which are the examples of the present application, have the above-mentioned values. The value is smaller than that of Sample 1-1. It can be seen that the difference in the weight loss due to oxidation tends to increase as the heating time increases.
【００２５】したがって、この加熱保持試験の結果か
ら、本願発明の各実施例はいずれも既存の耐熱鋳鉄より
良好な耐熱性を有することが確認できる。Therefore, from the results of this heating and holding test, it can be confirmed that each of the examples of the present invention has better heat resistance than the existing heat-resistant cast iron.
【００２６】一方、繰り返し加熱試験は、前記加熱炉中
の低温部と高温部との間を移動させることにより一定の
熱サイクルで繰り返し加熱し、これに伴う酸化減量を測
定するものである。On the other hand, the repeated heating test is a test in which heating is repeatedly performed in a constant heat cycle by moving between a low temperature portion and a high temperature portion in the heating furnace, and an oxidative loss is measured.
【００２７】この繰り返し加熱試験においては、低温部
の温度を200℃とし高温部の温度を870℃として、各試料
をそれぞれ200回，500回および1000回の回数だけ加熱
し、各時点で質量を測定することにより酸化減量を得
た。In this repeated heating test, the temperature of the low temperature part was set to 200 ° C., the temperature of the high temperature part was set to 870 ° C., each sample was heated 200 times, 500 times and 1000 times respectively, and the mass was measured at each time point. Oxidation weight loss was obtained by measurement.
【００２８】この繰り返し加熱試験の結果は、図２に示
す通りであり、図中Ｃは200回の時点での酸化減量を示
し、Ｄは500回，Ｅは1000回の酸化減量を示す。The results of this repeated heating test are as shown in FIG. 2, in which C indicates the oxidation weight loss at the time of 200 times, D indicates the oxidation weight loss of 500 times, and E indicates the oxidation weight loss of 1000 times.
【００２９】なお、前記試料１−５〜１−８について
は、前記加熱保持試験の場合と同様に図示を省略する。The samples 1-5 to 1-8 are not shown, as in the case of the heating and holding test.
【００３０】図２からあきらかなように、繰り返し加熱
の回数がいずれの場合であっても、比較例である試料１
−１の酸化減量が最も大きく、本願発明の実施例である
各試料１−２〜１−４はいずれもそれより小さくなって
いる。As is clear from FIG. 2, no matter how many times the heating was repeated, Sample 1 as a comparative example was used.
-1 has the largest oxidative weight loss, and each of the samples 1-2 to 1-4 which are the examples of the present invention is smaller than that.
【００３１】したがって、本願発明の各実施例は、この
繰り返し加熱試験の結果からも、既存の耐熱性鋳鉄より
良好な耐熱性を有していることがわかる。Therefore, it can be seen from the results of this repeated heating test that each example of the present invention has better heat resistance than the existing heat resistant cast iron.
【００３２】とくに、試料１−２については、前記加熱
保持試験および繰り返し加熱試験のいずれの結果におい
ても、既存の耐熱性鋳鉄の酸化減量と比べて大幅に小さ
い値を示しており、きわめて優れた耐熱性を備えている
ことが明らかである。In particular, for sample 1-2, both the results of the heating holding test and the repeated heating test showed significantly smaller values than the oxidation weight loss of the existing heat-resistant cast iron, and were extremely excellent. It is clear that it has heat resistance.
【００３３】なお、この試料１−２と同様の趣旨によ
る，前記試料１−５〜１−８も概ね同様である。The samples 1-5 to 1-8, which have the same meaning as the sample 1-2, are substantially the same.
【００３４】前記した第１の実験の結果から、高Ni鋳鉄
へのSiの添加量を3.0％以上で概ね10％程度までとする
ことはその耐熱性の向上に有効であるが、次に説明する
第２の実験においては、前記の結果の妥当性を確認する
とともに、第１の実験に用いた試料より多量あるいは少
量のNiを含有する場合の耐熱性についての見通しを調査
する。From the results of the first experiment described above, it is effective to improve the heat resistance of the high Ni cast iron by increasing the amount of Si added to 3.0% or more to about 10%. In the second experiment, the validity of the above result is confirmed, and the prospect of heat resistance in the case of containing a larger amount or a smaller amount of Ni than the sample used in the first experiment is investigated.
【００３５】なお、この第２の実験における各試料の成
分組成は、表．２に示すとおりであり、これらの各試料
により概ね容器状の所定形状のターボチャージャ用ケー
シング部品を鋳造し、これをそのままテストピースとし
て用い、これを前記した第１の実験での繰り返し加熱試
験と同様に200〜870℃の範囲で繰り返し加熱することに
より、その形状において熱応力の集中する部位でのクラ
ック等の損傷が生じるまでの加熱回数を以て耐熱性の面
での寿命とした。The composition of each sample in this second experiment is shown in Table. As shown in Fig. 2, each of these samples was used to cast a casing part for a turbocharger having a substantially container-like predetermined shape, which was used as it was as a test piece, which was subjected to the repeated heating test in the first experiment described above. Similarly, by repeatedly heating in the range of 200 to 870 ° C., the number of times of heating until damage such as cracks occurs at the portion where the thermal stress is concentrated in the shape was taken as the life in terms of heat resistance.
【００３６】[0036]
【表．２】 なお、表．２は、各試料の成分組成を重量％で示すもの
であり、表．２において、試料２−１は第１の実験にお
ける試料１−１と同一の比較例である。【table. 2] Table. 2 shows the component composition of each sample in% by weight. 2, the sample 2-1 is the same comparative example as the sample 1-1 in the first experiment.
【００３７】試料２−２から試料２−７は、いずれもこ
の発明の実施例であって、試料２−６は第１の実験での
試料１−２と同一のものである。Samples 2-2 to 2-7 are all examples of the present invention, and sample 2-6 is the same as sample 1-2 in the first experiment.
【００３８】なお、第１の実験に用いた試料より多量の
Niを含有する場合の耐熱性についての見通しは、この第
２の実験後の試料２−５のテストピースを観察すること
により行ない、少量のNiを含有する場合については試料
２−４のテストピースを観察して行なった。A larger amount of the sample used in the first experiment was used.
The prospect of heat resistance in the case of containing Ni is performed by observing the test piece of Sample 2-5 after this second experiment, and in the case of containing a small amount of Ni, the test piece of Sample 2-4. Was observed.
【００３９】これらのテストピースを観察するかぎり、
多量あるいは少量のNiを含有する場合でも、先の第１の
実験と概ね同様に良好な耐熱性を有することが確認され
た。As long as one observes these test pieces,
It was confirmed that even when a large amount or a small amount of Ni was contained, it had good heat resistance in the same manner as in the first experiment.
【００４０】そして、この第２の実験で得られた，寿命
となる加熱回数をSi量で整理してみると、図３に示すと
おりである。なお、図３において○付きの数字は成分組
成との対応を示す。Then, the number of times of heating, which is the life, obtained in the second experiment is arranged by the amount of Si, as shown in FIG. In addition, in FIG. 3, the numbers with a circle show the correspondence with the component composition.
【００４１】図３から明かとなるように、本願実施例で
ある前記各試料と同様の成分組成からなるターボチャー
ジャ用ケーシングの熱応力に関連する耐熱性は、Si量の
3.5%〜7%の範囲で、中高状となっている。As is apparent from FIG. 3, the heat resistance associated with the thermal stress of the turbocharger casing having the same composition as the samples of the examples of the present application is related to the amount of Si.
In the range of 3.5% to 7%, it has a medium-high shape.
【００４２】これは、Si量が3.5%未満の場合には、加熱
による酸化減量が大きく、鋳物表面に形成される酸化物
層が脱落し、これにより鋳物品の強度が低下してクラッ
ク等を発生するからであると考えられる。This is because when the Si content is less than 3.5%, the oxidation loss due to heating is large and the oxide layer formed on the surface of the casting falls off, which lowers the strength of the cast article and causes cracks and the like. It is thought to be because it occurs.
【００４３】また、Si量が7%を越える場合には、鋳物材
料の硬さが大きく，じん性が小さいことにより、加熱に
よる熱応力に敏感に反応してクラックが発生しやすくな
るからであると考えられる。Further, when the Si content exceeds 7%, the hardness of the casting material is large and the toughness is small, so that it is sensitive to the thermal stress due to heating and cracks are likely to occur. it is conceivable that.
【００４４】前記Si量の3.5%〜7%の範囲においては、加
熱による酸化減量が小さく、かつ加熱による熱応力に対
抗し得る程度の適度なじん性をも具備しているので、こ
の範囲での鋳鉄材料は、とくに繰り返し加熱により熱応
力が作用する場合きわめて優れた耐熱性を有するもので
ある。In the range of 3.5% to 7% of the Si content, the oxidation weight loss due to heating is small, and the toughness is appropriate to withstand the thermal stress due to heating. The cast iron material has extremely excellent heat resistance, especially when thermal stress is exerted by repeated heating.
【００４５】以上説明した第２の実験においては、鋳物
品としてターボチャージャ用ケーシングを一例として挙
げて説明したが、これに限らず、例えば自動車エンジン
の排気マニホールド等の排気系部品やその他繰り返し加
熱を受ける鋳物品一般に適用できることはいうまでもな
い。In the second experiment described above, a casing for a turbocharger was described as an example of a cast article, but the present invention is not limited to this. For example, exhaust system parts such as an exhaust manifold of an automobile engine and other repetitive heating may be performed. It goes without saying that it can be applied to cast articles generally received.
【００４６】[0046]
【発明の効果】以上説明したように、請求項１記載の発
明によれば、鋳鉄に、13.0〜40.0％のNiと所定量のSiと
が添加されているので、その鋳物の耐熱性は良好であ
る。As described above, according to the invention described in claim 1, since 13.0 to 40.0% of Ni and a predetermined amount of Si are added to cast iron, the heat resistance of the cast product is good. Is.
【００４７】そして、この場合にSi量が3.5〜7.0％の範
囲内であり、この範囲の成分組成からなる鋳鉄材料は、
繰り返し熱応力試験の結果からみて熱応力の集中に対す
る良好な耐性を有する鋳鉄材料である。In this case, the cast iron material having a Si content in the range of 3.5 to 7.0% and having a composition in this range is
It is a cast iron material having good resistance to the concentration of thermal stress in view of the results of repeated thermal stress tests.
【００４８】したがって、請求項１記載の耐熱性鋳鉄
は、耐熱性と熱応力に対する良好な耐性とを具備し、繰
り返し加熱を受ける鋳物品の耐久性を高めることができ
る。Therefore, the heat-resistant cast iron according to claim 1 has heat resistance and good resistance to thermal stress, and can enhance the durability of the cast article that is repeatedly heated.
【図１】加熱保持試験の結果を示すグラフである。FIG. 1 is a graph showing the results of a heating and holding test.
【図２】繰り返し加熱試験の結果を示すグラフである。FIG. 2 is a graph showing the results of repeated heating tests.
【図３】繰り返し熱応力試験の結果を示すグラフであ
る。FIG. 3 is a graph showing the results of repeated thermal stress tests.
Claims (1)
3.0〜40.0％のNiと、3.5〜7.0％のSiとを添加したこと
を特徴とする耐熱性鋳鉄。1. A cast iron which is repeatedly heated, the casting iron comprising:
Heat-resistant cast iron characterized by adding 3.0 to 40.0% Ni and 3.5 to 7.0% Si.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5122294A JPH06128685A (en) | 1992-10-19 | 1993-05-25 | Heat resistant cast iron |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4279790A JPH06128682A (en) | 1992-10-19 | 1992-10-19 | Heat resistant cast iron |
| JP5122294A JPH06128685A (en) | 1992-10-19 | 1993-05-25 | Heat resistant cast iron |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4279790A Division JPH06128682A (en) | 1992-10-19 | 1992-10-19 | Heat resistant cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06128685A true JPH06128685A (en) | 1994-05-10 |
Family
ID=26459444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5122294A Pending JPH06128685A (en) | 1992-10-19 | 1993-05-25 | Heat resistant cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06128685A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003055730A (en) * | 2001-08-13 | 2003-02-26 | Asahi Tec Corp | Cover body for underground structure |
-
1993
- 1993-05-25 JP JP5122294A patent/JPH06128685A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003055730A (en) * | 2001-08-13 | 2003-02-26 | Asahi Tec Corp | Cover body for underground structure |
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