JPS62228452A - Spheroidal graphite cast iron having resistance to high temperature oxidation - Google Patents
Spheroidal graphite cast iron having resistance to high temperature oxidationInfo
- Publication number
- JPS62228452A JPS62228452A JP7085886A JP7085886A JPS62228452A JP S62228452 A JPS62228452 A JP S62228452A JP 7085886 A JP7085886 A JP 7085886A JP 7085886 A JP7085886 A JP 7085886A JP S62228452 A JPS62228452 A JP S62228452A
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- temperature oxidation
- high temperature
- spheroidal graphite
- graphite cast
- 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
Links
- 230000003647 oxidation Effects 0.000 title claims abstract description 31
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 31
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 19
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 229910052742 iron Inorganic materials 0.000 claims abstract 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000011777 magnesium Substances 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 2
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 18
- 230000006866 deterioration Effects 0.000 abstract description 2
- 230000002542 deteriorative effect Effects 0.000 abstract description 2
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- ZVBWPVOCTORPLM-UHFFFAOYSA-N formylsilicon Chemical compound [Si]C=O ZVBWPVOCTORPLM-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 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】
〔発明の技術分野〕
本発明は耐高温酸化球状黒鉛鋳鉄、さらに詳細には良好
な機械加工性を有し、かつ高温酸化に対し優れた耐久性
を有する耐高温酸化球状黒鉛鋳鉄に関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to high temperature oxidation resistant spheroidal graphite cast iron, and more particularly to high temperature oxidation resistant spheroidal graphite cast iron having good machinability and excellent durability against high temperature oxidation. Regarding spheroidal graphite cast iron.
自動車などの内燃機関に使用される材料は、前記内燃機
関が高温に曝されるため、高温において良好な耐久性（
耐高温酸化性）があり、かつ複雑な形状に鋳造、加工さ
れる可能性があるために、機械加工性が良好なことが要
求される。Materials used in internal combustion engines such as automobiles have good durability at high temperatures (because the internal combustion engines are exposed to high temperatures).
Since it has high temperature oxidation resistance) and can be cast and processed into complex shapes, it is required to have good machinability.
このような高温において使用される鋳鉄材料の耐高温酸
化性を改良した鋳鉄として、従来、前記鋳鉄に対し珪素
（Ｓｉ）を５〜７％添加した鋳鉄（商品名 シラル）が
知られている。このような鋳鉄は耐高温性に優れてはい
るが、強度特性や加工性が悪く、たとえば内燃機関の排
気マニホールドなどの複雑形状を有する部品の材料とし
ては、事実上使用できないか、使用困難であるという欠
点があった。すなわち、耐高温酸化性を向上させるため
に、Ｓｔを多量に添加すると、じん性が急激に低下して
、加工性や強度が加速度的に悪化するからである。As a cast iron with improved high-temperature oxidation resistance of a cast iron material used at such high temperatures, cast iron (trade name: SIRAL), which is made by adding 5 to 7% silicon (Si) to the above-mentioned cast iron, is known. Although cast iron has excellent high-temperature resistance, its strength and workability are poor, making it practically unusable or difficult to use as a material for parts with complex shapes, such as the exhaust manifold of an internal combustion engine. There was a drawback. That is, if a large amount of St is added in order to improve high-temperature oxidation resistance, the toughness will drop rapidly and the workability and strength will deteriorate at an accelerated rate.
本発明は上述の点に鑑みなされたものであり、強度特性
および加工性を低下せしめることなく、耐高温酸化性を
改良した耐高温酸化球状黒鉛鋳鉄を提供することを目的
とする。The present invention has been made in view of the above points, and an object thereof is to provide high temperature oxidation resistant spheroidal graphite cast iron with improved high temperature oxidation resistance without deteriorating strength properties and workability.
」＝述の目的を達成するために、本発明による耐高温酸
化黒鉛球状鋳鉄は、炭素（Ｃ） ２．５〜４゜０％、
珪素（Ｓｉ） ３．５〜４．３％、マグネシウム（Ｍ
ｇ） ０．０２〜０．０６％、アルミニウム（八］）
１〜２％、残部 鉄（Ｆｅ）より基本的になること
を特徴としている。In order to achieve the above object, the high temperature resistant oxidized graphite spheroidal cast iron according to the present invention contains 2.5 to 4% carbon (C),
Silicon (Si) 3.5-4.3%, Magnesium (M
g) 0.02-0.06%, aluminum (8)
It is characterized by being more basic than iron (Fe), with the balance being 1-2%.
このような本発明による黒鉛球状鋳鉄によればＳｉおよ
びＡＩを所定量組み合わせることによって、加工性およ
び強度特性を著しく低下せしめることなく、耐高温酸化
性を向上させることができるという利点がある。The graphite spheroidal cast iron according to the present invention has the advantage that by combining a predetermined amount of Si and AI, high-temperature oxidation resistance can be improved without significantly reducing workability and strength properties.
本発明による耐高温酸化黒鉛球状鋳鉄は、Ｃ２゜５〜４
．０％、Ｓｉ ３．５〜４．３％、Ｍｇ ０．０２
〜０．０６％、ＡＩ １〜２％、残部 Ｆｅより基本
的になるものである。The high temperature resistant oxidized graphite spheroidal cast iron according to the present invention has a C2°5~4
．． 0%, Si 3.5-4.3%, Mg 0.02
~0.06%, AI 1-2%, balance Fe.
上記よりも明らかなように、本発明による耐高温酸化球
状鋳鉄によれば、Ｓｉは球状黒鉛鋳鉄の耐高温酸化性を
改良するために従来の球状黒鉛鋳鉄への添加量よりも多
口に添加される。このＳｉの添加量は３．５〜４゜３％
であるが、Ｓｉの添加量が３．５％未満であると、耐高
温酸化性がほとんど改良されず、一方４．３％を超えて
添加すると、じん性が急速に低下し、機械加工性、強度
を著しく低下させるからである。As is clear from the above, according to the high temperature oxidation resistant spheroidal cast iron of the present invention, Si is added in a larger amount than the conventional spheroidal graphite cast iron in order to improve the high temperature oxidation resistance of the spheroidal graphite cast iron. be done. The amount of Si added is 3.5 to 4.3%.
However, if the amount of Si added is less than 3.5%, the high temperature oxidation resistance will hardly be improved, while if it is added in excess of 4.3%, the toughness will rapidly decrease and the machinability will deteriorate. This is because the strength is significantly reduced.
さらに、ＡＩも耐高温酸化性を向上させるために添加す
るものである。このＡＩの添加量は、１〜２％である。Furthermore, AI is also added to improve high temperature oxidation resistance. The amount of this AI added is 1 to 2%.
八１の添加量が１％未満であると、耐高温酸化性の向上
が著しく小さく、また２％を超えると、じん性が低下し
て機械加工性および強度を急速に低下させる。If the amount of 81 added is less than 1%, the improvement in high temperature oxidation resistance is significantly small, and if it exceeds 2%, the toughness decreases and machinability and strength rapidly decrease.
本発明の特徴は上記Ｓｉと旧を所定量組合せて加工性を
著しく低下させることなく耐高温酸化性を向上させるこ
とにある。The feature of the present invention is that the above-mentioned Si and Si are combined in a predetermined amount to improve high-temperature oxidation resistance without significantly reducing workability.
このような本発明における耐高温酸化球状黒鉛鋳鉄はＦ
ｅ、 Ｃ、Ｍｇ、 Ｓｉおよび八１の他に不純物として
マンガン（Ｍｎ） 、リン（Ｐ）、硫黄（Ｓ ）などを
含むことも可能である。このような不純物は、たとえば
、Ｍｎ Ｏ，８％以下、Ｐ Ｏ，１０％以下、５０゜
１０％以下であるのがよい。Such high temperature oxidation spheroidal graphite cast iron in the present invention is F
In addition to C, Mg, Si, and 81, it is also possible to contain impurities such as manganese (Mn), phosphorus (P), and sulfur (S). Such impurities are preferably, for example, Mn 2 O at 8% or less, P 2 O at 10% or less, and 50°10% or less.
以下本発明の実施例について説明する。Examples of the present invention will be described below.
実施例
下記の組成の本発明による球状黒鉛鋳鉄を製造し、耐高
温酸化性および加工性を測定した。EXAMPLE Spheroidal graphite cast iron according to the present invention having the following composition was manufactured and its high temperature oxidation resistance and workability were measured.
第１表
耐高温酸化性の測定は、温度７５０℃の大気中雰囲気に
露し、経過時間毎に表面に形成された酸化スケールの厚
さを測定した。The high temperature oxidation resistance in Table 1 was measured by exposing the sample to an atmosphere at a temperature of 750° C. and measuring the thickness of the oxide scale formed on the surface at each elapsed time.
従来の鋳鉄および高Ｓｉ添加鋳鉄の耐高温酸化性の測定
結果とともに、第１図に示す。図中、×は従来の普通鋳
鉄、ムは通常の球状黒鉛鋳鉄、・は前述のシラル、○は
本発明による球状黒鉛鋳鉄で−Ｆ記の組成においてＡ１
を１％添加したもの、◎は本発明による球状黒鉛鋳鉄で
Ａ１を２％添加したものを示している。Figure 1 shows the measurement results of high-temperature oxidation resistance of conventional cast iron and high Si-added cast iron. In the figure, × indicates conventional ordinary cast iron, MU indicates ordinary spheroidal graphite cast iron, ・ indicates the aforementioned silal, ○ indicates spheroidal graphite cast iron according to the present invention, and A1 in the composition shown in -F.
◎ indicates the spheroidal graphite cast iron according to the present invention to which 2% of A1 was added.
この第１図より明らかなように、本発明による球状黒鉛
鋳鉄によれば、耐高温酸化性が著しく改良されているこ
とがわかる。特に、従来の耐高温酸化性の鋳鉄であるシ
ラルよりも良好な耐高温酸化性を示した。As is clear from FIG. 1, the spheroidal graphite cast iron according to the present invention has significantly improved high-temperature oxidation resistance. In particular, it showed better high-temperature oxidation resistance than Silal, which is a conventional high-temperature oxidation-resistant cast iron.
次ぎに、上述の組成の球状黒鉛鋳鉄において、Ａ１の添
加量を変化させ、７５０℃の大気中に２００時間曝した
ときの酸化スケールの厚さを測定するとともに、そのへ
１添加量における球状黒鉛鋳鉄のピンカース硬度（Ｉｌ
ｖ）と伸び（％）を測定した。結果を第２図および第３
図に示す。この第２図および第３図より明らかなように
、ＡＩ添加量が１〜２％の間において良好な耐高温酸化
性を有し加工性の大きな低下はないことがわかった。Next, in the spheroidal graphite cast iron having the above composition, the amount of A1 added was varied and the thickness of the oxide scale was measured when exposed to the atmosphere at 750°C for 200 hours, and the thickness of the spheroidal graphite at the amount of spheroidal graphite added was Pinkers hardness (Il) of cast iron
v) and elongation (%) were measured. The results are shown in Figures 2 and 3.
As shown in the figure. As is clear from FIGS. 2 and 3, it was found that when the amount of AI added was between 1 and 2%, good high-temperature oxidation resistance was achieved and there was no significant deterioration in workability.
以上説明したように、本発明による耐高温酸化球状黒鉛
鋳鉄によれば、ＳｉおよびＡＩを所定量組み合わせて鋳
鉄に添加することによって、加工性を損なうことなく、
耐高温酸化性を改良できるという利点がある。As explained above, according to the high temperature oxidation resistant spheroidal graphite cast iron according to the present invention, by adding a predetermined amount of Si and AI in combination to the cast iron, without impairing workability,
It has the advantage of improving high temperature oxidation resistance.
第１図は従来の鋳鉄と本発明による耐高温酸化球状鋳鉄
の耐高温性を測定した結果を示す図、第２図は本発明に
よる球状黒鉛鋳鉄のへ１添加量の変化に対する耐高温酸
化性を示した図、第３図は本発明による球状黒鉛鋳鉄の
ＡＩ添加量の変化に対する加工性の変化を示した図であ
る。Figure 1 shows the results of measuring the high temperature resistance of conventional cast iron and the high temperature oxidation resistant spheroidal cast iron according to the present invention, and Figure 2 shows the high temperature oxidation resistance of the spheroidal graphite cast iron according to the present invention as a function of changes in the amount of hel added. FIG. 3 is a diagram showing the change in workability of the spheroidal graphite cast iron according to the present invention with respect to the change in the amount of AI added.
Claims (1)
素３．５〜４．３％、マグネシウム０．０２〜０．０６
％、アルミニウム１〜２％、残部鉄より基本的になる耐
高温酸化球状黒鉛鋳鉄。(1) Carbon 2.5-4.0% (weight%, same below), Silicon 3.5-4.3%, Magnesium 0.02-0.06
%, aluminum 1-2%, the balance is basically more resistant to high temperature oxidation spheroidal graphite cast iron than iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7085886A JPS62228452A (en) | 1986-03-31 | 1986-03-31 | Spheroidal graphite cast iron having resistance to high temperature oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7085886A JPS62228452A (en) | 1986-03-31 | 1986-03-31 | Spheroidal graphite cast iron having resistance to high temperature oxidation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62228452A true JPS62228452A (en) | 1987-10-07 |
| JPH0564228B2 JPH0564228B2 (en) | 1993-09-14 |
Family
ID=13443680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7085886A Granted JPS62228452A (en) | 1986-03-31 | 1986-03-31 | Spheroidal graphite cast iron having resistance to high temperature oxidation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62228452A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014148694A (en) * | 2013-01-31 | 2014-08-21 | Daihatsu Motor Co Ltd | Cast iron |
| WO2017111720A1 (en) * | 2015-12-25 | 2017-06-29 | Ford Otomotiv Sanayi Anonim Sirketi | Cast iron alloy provided with improved mechanical and thermal properties |
-
1986
- 1986-03-31 JP JP7085886A patent/JPS62228452A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014148694A (en) * | 2013-01-31 | 2014-08-21 | Daihatsu Motor Co Ltd | Cast iron |
| WO2017111720A1 (en) * | 2015-12-25 | 2017-06-29 | Ford Otomotiv Sanayi Anonim Sirketi | Cast iron alloy provided with improved mechanical and thermal properties |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0564228B2 (en) | 1993-09-14 |
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