KR20030028909A - Heat resist cast iron for exhaust system of automobile - Google Patents
Heat resist cast iron for exhaust system of automobile Download PDFInfo
- Publication number
- KR20030028909A KR20030028909A KR1020010061202A KR20010061202A KR20030028909A KR 20030028909 A KR20030028909 A KR 20030028909A KR 1020010061202 A KR1020010061202 A KR 1020010061202A KR 20010061202 A KR20010061202 A KR 20010061202A KR 20030028909 A KR20030028909 A KR 20030028909A
- Authority
- KR
- South Korea
- Prior art keywords
- range
- content
- exhaust system
- cast iron
- silicon
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
본 발명은 자동차 엔진 배기계용 주철 조성물에 관한 것으로, 더욱 상세하게는 종래 재질에 내산화성 증대를 위하여 규소(Si) 4.0 내지 4.6 중량%, 크롬(Cr) 0.3 내지 0.7 중량%를 포함시킴은 물론 고온 강도의 향상을 위하여 몰리브덴(Mo) 0.4 내지 0.8 중량%를 포함시키고, 여기에 탄소(C) 3.0 내지 3.3 중량%, 망간(Mn) 0.6 중량% 이하, 인(P) 0.04 중량% 이하, 황(S) 0.02 중량% 이하 및 마그네슘(Mg)0.04 내지 0.065 중량%를 포함시킨 자동차 엔진 배기계용 주철 조성물에 관한 것이다.The present invention relates to a cast iron composition for an automobile engine exhaust system, and more specifically, to include a silicon (Si) 4.0 to 4.6% by weight, chromium (Cr) 0.3 to 0.7% by weight in order to increase the oxidation resistance in the conventional material, as well as high temperature To improve the strength, molybdenum (Mo) 0.4 to 0.8% by weight, including carbon (C) 3.0 to 3.3% by weight, manganese (Mn) 0.6% by weight or less, phosphorus (P) 0.04% by weight, sulfur ( S) It relates to a cast iron composition for automobile engine exhaust system containing 0.02% by weight or less and magnesium (Mg) 0.04 to 0.065% by weight.
일반적으로 자동차 엔진의 배기계는 최근 성능향상과 배기규제의 강화로 인해서 (Exhaust Manifold)처럼 점점 온도가 가혹한 조건으로 전개되고 있다. 현재 사용되는 일반적인 경제성이 있는 재질로는 구상흑연 주철로서 다음과 같은 것들이 있으며, 이들은 FCD-J(700℃) < FCD-H(730℃) < FCD-HS(750 ℃) << Ni-Base 순으로 고가이다.In general, the exhaust system of automobile engines is being developed under severe temperature conditions, such as Exhaust Manifold, due to recent improvements in performance and tightening of exhaust regulations. The most economical materials currently used are spheroidal graphite cast iron, which are as follows: FCD-J (700 ℃) <FCD-H (730 ℃) <FCD-HS (750 ℃) << Ni-Base It is expensive.
그러나, 이들 주철재 중 최대 사용온도는 약 750 ℃에 불과하며, 엔진개발과정 및 실제 필드에서 내산화성 및 고온에서의 강도가 낮아 내구성의 저하현상이 발생하여 많은 클레임이 발생되는 문제점이 있어왔다(참고: 도 1).However, the maximum use temperature of these cast irons is only about 750 ℃, and in the engine development process and the actual field, there is a problem that many claims are generated due to low resistance to oxidation resistance and low strength at high temperature. Note: Figure 1).
따라서, 내산화성과 고온강도를 보강할 수 있는 재질개발의 필요성이 요구되고 있던 실정이었다.Therefore, there was a need for the development of materials capable of reinforcing oxidation resistance and high temperature strength.
이에, 본 발명의 별명자는 상기와 같은 문제점을 해결하기 위하여 예의 노력한 결과, 내산화성 증대를 위하여 일정 함량의 규소(Si) 및 크롬(Cr)을 포함시키고, 고온 강도의 향상을 위하여 일정 범위의 몰리브덴(Mo)을 포함하는 주철합금을 제작하여 주철재의 내산화성 및 고온강도를 향상시킬 수 있음을 확인함으로써, 본 발명을 완성하였다.Therefore, the nickname of the present invention, as a result of intensive efforts to solve the above problems, includes a certain amount of silicon (Si) and chromium (Cr) to increase the oxidation resistance, and a range of molybdenum to improve the high temperature strength The present invention was completed by confirming that the cast iron alloy containing (Mo) was improved to improve oxidation resistance and high temperature strength of the cast iron material.
결국, 본 발명의 주된 목적은 규소(Si) 4.0 내지 4.6 중량%, 크롬(Cr) 0.3내지 0.7 중량%, 몰리브덴(Mo) 0.4 내지 0.8 중량%, , 탄소(C) 3.0 내지 3.3 중량%, 망간(Mn) 0.6 중량% 이하, 인(P) 0.04 중량% 이하, 황(S) 0.02 중량% 이하 및 마그네슘(Mg) 0.04 내지 0.065 중량%를 포함하는 자동차 엔진 배기계용 주철 조성물을 제공하는 데 있다.After all, the main purpose of the present invention is silicon (Si) 4.0 to 4.6% by weight, chromium (Cr) 0.3 to 0.7% by weight, molybdenum (Mo) 0.4 to 0.8% by weight, carbon (C) 3.0 to 3.3% by weight, manganese (Mn) 0.6 wt% or less, phosphorus (P) 0.04 wt% or less, sulfur (S) 0.02 wt% or less, and magnesium (Mg) 0.04 to 0.065 wt% to provide a cast iron composition for an automotive engine exhaust system.
도 1은 산화에 의한 관통 파괴현상을 나타낸 것이다.Figure 1 shows the penetration failure phenomenon by oxidation.
도 2는 본 발명에 따른 실시예와 비교예의 내산화성 시험결과를 히스토그램으로 나타낸 것이다.Figure 2 shows the results of the oxidation resistance test of the Examples and Comparative Examples according to the present invention as a histogram.
도 3은 본 발명에 따른 실시예와 비교예의 고온 인장강도 시험결과를 히스토그램으로 나타낸 것이다.3 is a histogram of the results of the high temperature tensile strength test of Examples and Comparative Examples according to the present invention.
이하, 본 발명의 자동차 엔진 배기계용 주철 조성물에 대하여 보다 구체적으로 살펴보면 다음과 같다.Hereinafter, the cast iron composition for automobile engine exhaust system of the present invention will be described in more detail.
우선, 본 발명은 자동차 엔진 배기계용 주철재 조성에 있어서, 규소(Si) 4.0 내지 4.6 중량%, 크롬(Cr) 0.3 내지 0.7 중량%, 몰리브덴(Mo) 0.4 내지 0.8 중량%, 탄소(C) 3.0 내지 3.3 중량%, 망간(Mn) 0.6 중량% 이하, 인(P) 0.04 중량% 이하, 황(S) 0.02 중량% 이하 및 마그네슘(Mg) 0.04 내지 0.065 중량%를 포함하는 것을 그 특징으로 한다.First, the present invention, in the cast iron composition for automobile engine exhaust system, silicon (Si) 4.0 to 4.6% by weight, chromium (Cr) 0.3 to 0.7% by weight, molybdenum (Mo) 0.4 to 0.8% by weight, carbon (C) 3.0 To 3.3 wt%, manganese (Mn) 0.6 wt% or less, phosphorus (P) 0.04 wt% or less, sulfur (S) 0.02 wt% or less, and magnesium (Mg).
일반적으로 자동차의 엔진 배기계용으로 사용되는 주철재는 탄소, 규소, 망간, 인, 황 및 마그네슘 등과의 합금을 사용한다. 그러나, 본 발명에서는 재질의 내산화성을 증대시키기 위해 이상의 조성에 규소(Si)의 함량을 일정하게 조정하고 크롬(Cr)을 추가적으로 포함시킨다. 이때, 규소(Si)의 함량은 전체 함량 중 4.0 내지 4.6 중량% 범위가 바람직하다. 왜냐하면, 이 범위를 벗어나면 낮을경우 내산화성 부족, 높을경우 취성의 증대 등으로 바람직하지 않기 때문이다. 또한, 크롬(Cr)의 함량은 전체 함량 중 0.3 내지 0.7 중량%를 첨가하는 것이 바람직하다. 이 성분 역시 상기 범위를 벗어나면 내열성 부족이 발생된다는 점에서 바람직하지 않기 때문이다. 또한, 본 발명은 재질의 고온 강도를 향상시키기 위하여 몰리브덴을 전체함량 중 0.4 내지 0.8 중량% 범위로 포함시킨다. 이 몰리브덴이 상기 범위를 벗어나면 고온강도의 부족 현상이 발생된다는 점에서 바람직하지 않게 된다.In general, the cast iron used for the exhaust system of the automobile uses an alloy of carbon, silicon, manganese, phosphorus, sulfur and magnesium. However, in the present invention, in order to increase the oxidation resistance of the material, the content of silicon (Si) is constantly adjusted to the above composition, and chromium (Cr) is additionally included. At this time, the content of silicon (Si) is preferably in the range of 4.0 to 4.6% by weight of the total content. This is because, if it is out of this range, it is not preferable due to lack of oxidation resistance at low and increased brittleness at high. In addition, the content of chromium (Cr) is preferably added 0.3 to 0.7% by weight of the total content. It is because this component is also unpreferable in the point which heat deficiency arises out of the said range. In addition, the present invention includes molybdenum in the range of 0.4 to 0.8% by weight of the total content to improve the high temperature strength of the material. If the molybdenum is out of the above range, it becomes undesirable in that shortage of high temperature strength occurs.
상기 성분 이외에 본 발명은 자동차 엔진 배기계용 주철재 조성에 탄소(C) 3.0 내지 3.3 중량%, 망간(Mn) 0.6 중량% 이하, 인(P) 0.04 중량% 이하, 황(S) 0.02 중량% 이하 및 마그네슘(Mg) 0.04 내지 0.065 중량%를 포함한다.In addition to the above components, the present invention provides a cast iron composition for automobile engine exhaust systems, wherein carbon (C) 3.0 to 3.3 wt%, manganese (Mn) 0.6 wt% or less, phosphorus (P) 0.04 wt% or less, sulfur (S) 0.02 wt% or less And 0.04 to 0.065 weight percent of magnesium (Mg).
이하, 본 발명을 실시예에 의하여 더욱 상세히 설명하고자 한다. 그러나, 이들 실시예는 오로지 본 발명을 보다 구체적으로 설명하기 위한 것으로, 이들 실시예에 의하여 본 발명의 범위가 한정되지 않는다는 것은 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 있어서 자명할 것이다.Hereinafter, the present invention will be described in more detail with reference to Examples. However, these examples are only for illustrating the present invention in more detail, it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited by these examples. .
실시예 및 비교예 1 내지 3:Examples and Comparative Examples 1 to 3:
다음 표 1에 나타낸 조성 및 함량을 이용하여 통상의 방법에 따라 주철재 시험편을 제작하였다. 그리고, 이 시험편을 이용하여 각각 인장강도, 산화량 및 현미경 조직 등을 관찰하였고, 그 결과를 다음 표 1, 도 2 및 도 3에 요약하여 나타내었다. 이때, 인장강도는 JIS Z 2241 방법으로, 산화량은 항온, 대기 조건에서 시간을 변수로, HB는 JIS Z 2245 방법으로 측정하였으며, 현미경조직은 각각 폴리싱후 광학현미경법에 의해 관찰하였다.Next, the cast iron test piece was manufactured according to a conventional method using the composition and content shown in Table 1 below. Then, the tensile strength, the oxidation amount and the microscopic structure were observed using the test pieces, respectively, and the results are summarized in the following Tables 1, 2 and 3. At this time, the tensile strength was measured by JIS Z 2241 method, the amount of oxidation as a time variable at constant temperature and atmospheric conditions, HB was measured by JIS Z 2245 method, and the microscopic structure was observed by optical microscopy after polishing, respectively.
상술한 바와 같이, 본 발명은 자동차 엔진 배기계용 주철 조성물에 관한 것이다. 이러한 본 발명에 따른 주철재는 내산화성 및 고온에서의 강도가 향상될뿐만 아니라, 최적설계로 실두께 저감에 따른 경량화가 가능하여 자동차 엔진의 배기계 부품(Exhaust manifold, Turbo charger housing) 등에 유용하게 적용할 수 있는 효과가 있다.As mentioned above, the present invention relates to a cast iron composition for an automobile engine exhaust system. The cast iron according to the present invention is not only improves oxidation resistance and strength at high temperature, but also can be effectively applied to exhaust system parts of automobile engines (Exhaust manifold, Turbo charger housing) as it can be lightened by reducing the thickness by an optimal design. It can work.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020010061202A KR20030028909A (en) | 2001-10-04 | 2001-10-04 | Heat resist cast iron for exhaust system of automobile |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020010061202A KR20030028909A (en) | 2001-10-04 | 2001-10-04 | Heat resist cast iron for exhaust system of automobile |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20030028909A true KR20030028909A (en) | 2003-04-11 |
Family
ID=29563244
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020010061202A KR20030028909A (en) | 2001-10-04 | 2001-10-04 | Heat resist cast iron for exhaust system of automobile |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20030028909A (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5858248A (en) * | 1981-10-05 | 1983-04-06 | Nissan Motor Co Ltd | Heat resistant spheroidal graphite cast iron |
US4450019A (en) * | 1982-04-01 | 1984-05-22 | Toyo Kogyo Co., Ltd. | Ductile cast iron |
JPS59185758A (en) * | 1983-04-05 | 1984-10-22 | Mitsubishi Heavy Ind Ltd | High-silicon spheroidal graphite cast iron |
JPS59193242A (en) * | 1983-04-19 | 1984-11-01 | Mitsubishi Heavy Ind Ltd | High silicon spheroidal graphite cast iron |
JPS6324041A (en) * | 1986-07-16 | 1988-02-01 | Toyota Motor Corp | Heat resistant spheroidal graphite cast iron |
JPH03146638A (en) * | 1989-11-01 | 1991-06-21 | Fukushima Seiko Kk | Suction type expendable casting mold method |
JPH0987796A (en) * | 1995-09-25 | 1997-03-31 | Hitachi Metals Ltd | Heat resistant spheroidal graphite cast iron |
-
2001
- 2001-10-04 KR KR1020010061202A patent/KR20030028909A/en not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5858248A (en) * | 1981-10-05 | 1983-04-06 | Nissan Motor Co Ltd | Heat resistant spheroidal graphite cast iron |
US4450019A (en) * | 1982-04-01 | 1984-05-22 | Toyo Kogyo Co., Ltd. | Ductile cast iron |
JPS59185758A (en) * | 1983-04-05 | 1984-10-22 | Mitsubishi Heavy Ind Ltd | High-silicon spheroidal graphite cast iron |
JPS59193242A (en) * | 1983-04-19 | 1984-11-01 | Mitsubishi Heavy Ind Ltd | High silicon spheroidal graphite cast iron |
JPS6324041A (en) * | 1986-07-16 | 1988-02-01 | Toyota Motor Corp | Heat resistant spheroidal graphite cast iron |
JPH03146638A (en) * | 1989-11-01 | 1991-06-21 | Fukushima Seiko Kk | Suction type expendable casting mold method |
JPH0987796A (en) * | 1995-09-25 | 1997-03-31 | Hitachi Metals Ltd | Heat resistant spheroidal graphite cast iron |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4137054B2 (en) | Gray cast iron alloy and internal combustion engine casting parts | |
KR101373488B1 (en) | Spheroidal graphite cast iron | |
US8454764B2 (en) | Ni-25 heat-resistant nodular graphite cast iron for use in exhaust systems | |
KR20120009172A (en) | Flake Graphite Cast Iron with High Tensile Strength, Machinability and cylinder block for vehicle engine | |
KR20030028909A (en) | Heat resist cast iron for exhaust system of automobile | |
KR20040105278A (en) | Composition of cast iron for engine exhaust system in automobile | |
KR20030055751A (en) | Cast iron with improved oxidation resistance at high temperature | |
JP2923578B2 (en) | Wear resistant aluminum alloy | |
WO1994008062A1 (en) | Alloyed grey iron having high thermal fatigue resistance and good machinability | |
EP0109040B1 (en) | Heat-resisting spheroidal graphite cast iron | |
KR20030021917A (en) | A composition of cylinder head for diesel and gasoline | |
KR20120133778A (en) | High strength grey cast iron and method manufacturing thereof | |
JP3866841B2 (en) | Wear-resistant steel | |
JP2981899B2 (en) | Piston ring material | |
JP3303661B2 (en) | Heat resistant high strength aluminum alloy | |
JP3874133B2 (en) | Wear-resistant steel | |
EP3974553A1 (en) | Vermicular cast iron alloy, combustion engine block and head | |
KR20070028809A (en) | Composition of ferritic ductile cast iron for engine's exhaust manifold | |
JPS63100154A (en) | Spheroidal graphite cast iron excellent in wear resistant and oxidation resistance | |
JPS6025500B2 (en) | Heat-resistant and wear-resistant iron-based sintered alloy for valve seat rings with excellent workability | |
KR20050096228A (en) | Composition of turbin housing for automobile | |
JP2002371335A (en) | Heat-resistant spherical cast graphite iron for exhaust part superior in oxidation resistance | |
JPH0359967B2 (en) | ||
JP2673593B2 (en) | Built-in engine valve for intake | |
JPS634044A (en) | Alloy for exhaust manifold |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
E601 | Decision to refuse application |