KR20040037961A - Compound for manufacturing cylinder head of diesel engine - Google Patents

Compound for manufacturing cylinder head of diesel engine Download PDF

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Publication number
KR20040037961A
KR20040037961A KR1020020066810A KR20020066810A KR20040037961A KR 20040037961 A KR20040037961 A KR 20040037961A KR 1020020066810 A KR1020020066810 A KR 1020020066810A KR 20020066810 A KR20020066810 A KR 20020066810A KR 20040037961 A KR20040037961 A KR 20040037961A
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weight
cylinder head
diesel engine
less
tensile strength
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KR1020020066810A
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Korean (ko)
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김종문
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현대자동차주식회사
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Publication of KR20040037961A publication Critical patent/KR20040037961A/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PURPOSE: A cylinder head composition for diesel engine is provided which simultaneously improves tensile strength of cylinder head for heavy diesel engine and castability of the cylinder head. CONSTITUTION: The cylinder head composition for diesel engine comprises Fe as a basic constituent, 2.9 to 3.1 wt.% of C, 2.3 to 2.5 wt.% of Si, 0.8 to 1.0 wt.% of Mn, 0.1 wt.% or less of P, 0.08 wt.% or less of S, 0.8 to 1.0 wt.% of Cu, 0.1 wt.% or less of Cr, 0.03 wt.% or less of Ca, and 0.03 to 0.05 wt.% of Sn.

Description

디젤엔진용 실린더헤드 조성물{Compound for manufacturing cylinder head of diesel engine}Compound head composition for diesel engines {Compound for manufacturing cylinder head of diesel engine}

본 발명은 디젤엔진용 실린더헤드 조성물에 관한 것으로서, 더욱 상세하게는 중형 디젤엔진용 실린더헤드의 인장강도를 향상시키는 동시에 실린더헤드의 주조성을 향상시킬 수 있도록 한 디젤엔진용 실린더헤드 조성물에 관한 것이다.The present invention relates to a cylinder head composition for a diesel engine, and more particularly, to a cylinder head composition for a diesel engine to improve the tensile strength of a cylinder head for a medium diesel engine and to improve the castability of the cylinder head.

통상적으로 종래의 디젤엔진용 실린더헤드의 재질은 인장강도 25Kg급 및 이를 보강한 인장강도 29Kg급의 2가지 재료를 주로 채택하여 사용하고 있으나, 중형디젤엔진의 경우에는 실린더헤드의 크기가 크고 각 부위별 두께가 두꺼워 강도 저하요인이 되고 있으며, 엔진의 고출력화에 따른 폭발압 증대로 인하여 인장강도 30Kg이상의 재질이 요구된다.Conventionally, the material of the conventional diesel engine cylinder head is mainly used by adopting two materials of tensile strength 25Kg class and tensile strength 29Kg class reinforcing it, but in the case of medium-sized diesel engines, the size of the cylinder head is large and each part is used. Due to the thick thickness of the star, it is a factor of lowering strength. Due to the explosion pressure increase due to the high output of the engine, a material having a tensile strength of 30Kg or more is required.

그러나, 기존의 인장강도 29Kg급 재질은 실린더헤드의 인장강도는 어느 정도 만족시키는 효과를 제공하지만, 실린더헤드의 주조성을 크게 떨어뜨리고, 일반 주조공장에서 잘 사용하지 않는 안티몬(Sb)의 첨가로 스크랩(Scrab) 관리에 애로가 있었으며, 공정상의 불량 발생율이 높았다.However, although the existing tensile strength 29Kg material provides an effect that satisfies the tensile strength of the cylinder head to some extent, it greatly degrades the castability of the cylinder head, and the addition of antimony (Sb), which is not well used in a general casting factory, causes the scrap. There was a difficulty in managing the scrabb and the incidence of defects in the process was high.

종래의 인장강도 25Kg급 실린더 헤드 조성물은 주철의 기본 5대 성분인 탄소(C), 규소(Si), 망간(Mn), 인(P), 황(S)외에 매트릭스(Matrix)중의 퍼얼라이트(Pearlite)를 형성하기 쉽도록 안티몬(Sb)을 소량 첨가한 재질로서, 그 화학적 함량비는 다음 표 1과 같다.Conventional tensile strength 25Kg cylinder head composition is based on the five major components of cast iron, carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), in addition to the matrix in the matrix ( A small amount of antimony (Sb) was added to easily form pearlite, and the chemical content ratio thereof is shown in Table 1 below.

이러한 종래의 인장강도 25Kg급 실린더 헤드 조성물은 첨부한 도 2의 현미경 사진에서 관찰된 바와 같이, 100배 현미경 관찰시 최대흑연길이가 450㎛로서, 이 흑연의 길이가 후육부위(해당제품에서 상대적으로 두께가 두꺼운 부위를 말함)에서 지나차게 성장하는 경향이 있으므로 인장강도의 저하 요인이 되고 있다.This conventional tensile strength 25Kg cylinder head composition has a maximum graphite length of 450㎛ when observed 100 times microscope, as observed in the attached micrograph of Figure 2, the length of this graphite is relatively thick (in the product It tends to grow excessively in the thick part), which is a factor of lowering the tensile strength.

종래의 인장강도 29Kg급 실린더 헤드 조성물은 주철의 기본 5대 성분인 탄소(C), 규소(Si), 망간(Mn), 인(P), 황(S)외에 과다한 크롬(Cr) 및 몰리브덴(Mo)의 첨가에 의하여 매트릭스(Matrix)를 강화한 재질로서, 화학적 조성은 위의 표 1에 나타낸 바와 같다.Conventional tensile strength 29Kg cylinder head composition is in addition to carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S) in addition to the five basic components of cast iron (Cr) and molybdenum ( As a material reinforced by the addition of Mo) (Matrix), the chemical composition is as shown in Table 1 above.

이러한 종래의 인장강도 29Kg급 실린더 헤드 조성물은 인장강도는 어느 정도 만족할 수준이나, 실린더헤드의 주조성을 크게 떨어뜨리고, 주조공정을 포함하는 실린더헤드의 공정중에 불량 발생율이 높아지며, 스크랩(Scrab) 처리시 별도로 분류해야 하는 등의 공정상 불편한 단점이 있다.In the conventional tensile strength 29Kg cylinder head composition, the tensile strength is somewhat satisfactory, but greatly lowers the castability of the cylinder head, the failure rate during the process of the cylinder head including the casting process, and the scrap processing There are disadvantages in the process, such as the need to classify separately.

또한, 종래의 인장강도 29Kg급 실린더헤드 조성물도 첨부한 도 3의 현미경 사진에서 관찰된 바와 같이, 인장강도 25Kg급 실린더헤드 조성물에 비하여 덜하지만, 100배 현미경 관찰시 최대흑연길이가 320㎛로서, 이 흑연길이가 후육부위에서 지나차게 성장하는 경향이 있으므로 인장강도의 저하 요인이 되고 있다.In addition, as observed in the micrograph of FIG. 3 to which the conventional tensile strength 29Kg-class cylinder head composition is attached, the maximum graphite length is 320 μm at 100 times microscope observation, although less than that in the 25-kg-g cylinder head composition. Since the graphite length tends to grow excessively in the thick portion, it is a cause of lowering the tensile strength.

위의 표 1에 기재한 일본 히노(HINO)사의 실린더헤드 조성물의 경우에도 주철의 5대 기본 성분인 탄소(C), 규소(Si), 망간(Mn), 인(P), 황(S)외에 과다한 크롬(Cr) 및 몰리브덴(Mo)의 첨가에 의하여 매트릭스(Matrix)를 강화한 재질로서, 인장강도는 어느 정도 만족할 수준이나, 실린더헤드의 주조성을 크게 떨어뜨리는 단점이 있다.In the case of the cylinder head composition of HINO of Japan described in Table 1 above, the five basic components of cast iron are carbon (C), silicon (Si), manganese (Mn), phosphorus (P), and sulfur (S). In addition, as a material reinforced with a matrix by the addition of excessive chromium (Cr) and molybdenum (Mo), the tensile strength is somewhat satisfactory, but has a disadvantage in greatly reducing the castability of the cylinder head.

한편, 이상에서 본 종래의 실린더 헤드 조성물의 물성치는 다음의 표 2와 같다.On the other hand, the physical properties of the conventional cylinder head composition seen above are shown in Table 2 below.

따라서, 본 발명은 상기와 같은 종래의 인장강도 25Kg 및 29kg급 실린더헤드 조성물이 갖는 단점을 감안하여 발명한 것으로서, 중형 디젤엔진용 실린더헤드의 인장강도를 향상시키는 동시에 실린더헤드의 주조성을 향상시킬 수 있도록 디젤엔진용 실린더헤드 조성물을 제공하는데 그 목적이 있다.Therefore, the present invention is in view of the disadvantages of the conventional tensile strength 25Kg and 29kg class cylinder head composition as described above, it is possible to improve the tensile strength of the cylinder head for the medium-sized diesel engine and at the same time improve the castability of the cylinder head. The purpose is to provide a cylinder head composition for a diesel engine.

이러한 목적을 달성하기 위한 본 발명은: 디젤엔진용 실린더헤드 조성물에 있어서, 철(Fe)을 기본성분으로 하고, 여기에 탄소(C) 2.9∼3.1중량%, 규소(Si) 2.3∼2.5중량%, 망간(Mn) 0.8∼1.0중량%, 인(P) 0.1중량% 이하, 황(S) 0.08중량% 이하, 구리(Cu) 0.8∼1.0중량%, 크롬(Cr) 0.1중량% 이하, 칼슘(Ca) 0.03중량% 이하, 주석(Sn) 0.03∼0.05중량%가 함유된 것을 특징으로 하는 디젤엔진용 실린더헤드 조성물을 제공한다.In order to achieve the above object, the present invention provides a cylinder head composition for a diesel engine, wherein iron (Fe) is a basic component, and carbon (C) is 2.9 to 3.1 wt%, and silicon (Si) is 2.3 to 2.5 wt%. , Manganese (Mn) 0.8-1.0 wt%, phosphorus (P) 0.1 wt% or less, sulfur (S) 0.08 wt% or less, copper (Cu) 0.8-1.0 wt%, chromium (Cr) 0.1 wt% or less, calcium ( Ca) 0.03% by weight or less, Tin (Sn) 0.03 to 0.05% by weight to provide a cylinder head composition for a diesel engine.

바람직하기로는, 철(Fe)을 기본성분으로 하고, 여기에 탄소(C) 3.1중량%, 규소(Si) 2.36중량%, 망간(Mn) 0.85중량%, 인(P) 0.05중량%, 황(S) 0.06중량%,구리(Cu) 0.83중량%, 크롬(Cr) 0.06중량%, 칼슘(Ca) 0.02중량%, 주석(Sn) 0.035중량%가 함유된 것을 특징으로 하는 디젤엔진용 실린더헤드 조성물을 제공한다.Preferably, iron (Fe) is used as a basic component, and carbon (C) 3.1% by weight, silicon (Si) 2.36% by weight, manganese (Mn) 0.85% by weight, phosphorus (P) 0.05% by weight, sulfur ( S) 0.06% by weight, 0.83% by weight of copper (Cu), 0.06% by weight of chromium (Cr), 0.02% by weight of calcium (Ca), 0.035% by weight of tin (Sn). To provide.

더욱 바람직하기로는, 철(Fe)을 기본성분으로 하고, 여기에 탄소(C) 3.0중량%, 규소(Si) 2.4중량%, 망간(Mn) 0.85중량%, 인(P) 0.044중량%, 황(S) 0.056중량%, 구리(Cu) 0.85중량%, 크롬(Cr) 0.24중량%, 칼슘(Ca) 0.01중량%, 주석(Sn) 0.045중량%가 함유된 것을 특징으로 하는 디젤엔진용 실린더헤드 조성물을 제공한다.More preferably, iron (Fe) is the basic component, and carbon (C) 3.0% by weight, silicon (Si) 2.4% by weight, manganese (Mn) 0.85% by weight, phosphorus (P) 0.044% by weight, sulfur (S) 0.056% by weight, copper (Cu) 0.85% by weight, chromium (Cr) 0.24% by weight, calcium (Ca) 0.01% by weight, tin (Sn) cylinder head, characterized in that contained To provide a composition.

도 1은 본 발명에 따른 디젤엔진용 실린더헤드 조성물의 현미경 사진1 is a micrograph of a cylinder head composition for a diesel engine according to the present invention

도 2 및 도 3은 종래의 디젤엔진용 실린더헤드 조성물의 현미경 사진2 and 3 are micrographs of a conventional cylinder head composition for a diesel engine

이하, 본 발명에 따른 디젤엔진용 실린더헤드 조성물을 상세하게 설명하면 다음과 같다.Hereinafter, the cylinder head composition for a diesel engine according to the present invention will be described in detail.

본 발명은 중형 디젤엔진용 실린더헤드의 인장강도를 향상시키는 동시에 실린더헤드의 주조성을 향상시킬 수 있도록 한 디젤엔진용 실린더헤드 조성물을 제공하고자 한 것이다.The present invention is to provide a cylinder head composition for a diesel engine to improve the tensile strength of the cylinder head for a medium diesel engine and at the same time improve the castability of the cylinder head.

본 발명의 디젤엔진용 실린더헤드 조성물은 철(Fe)을 기본성분으로 하고, 여기에 탄소(C) 2.9∼3.1중량%, 규소(Si) 2.3∼2.5중량%, 망간(Mn) 0.8∼1.0중량%, 인(P) 0.1중량% 이하, 황(S) 0.08중량% 이하, 구리(Cu) 0.8∼1.0중량%, 크롬(Cr) 0.1중량% 이하, 칼슘(Ca) 0.03중량% 이하, 주석(Sn) 0.03∼0.05중량%가 함유된 것이다.The cylinder head composition for a diesel engine of the present invention contains iron (Fe) as a basic component, wherein carbon (C) is 2.9-3.1 wt%, silicon (Si) 2.3-2.5 wt%, and manganese (Mn) 0.8-1.0 wt% %, 0.1 wt% or less of phosphorus (P), 0.08 wt% or less of sulfur (S), 0.8 to 1.0 wt% of copper (Cu), 0.1 wt% or less of chromium (Cr), 0.03 wt% or less of calcium (Ca), tin ( Sn) 0.03 to 0.05 weight% is contained.

본 발명은 종래의 실린더헤드 조성물에 비해, 주조성을 보다 향상시키기 위하여(수축불량 방지) 몰리브덴(Mo)을 삭제하였으며, 그에따른 강도보강을 위하여 원탕의 탄소(C)함량을 3.1중량% 이하로 조절하였다.The present invention eliminated molybdenum (Mo) in order to improve the castability (prevention of shrinkage), compared to the conventional cylinder head composition, and adjust the carbon (C) content of the raw water to 3.1% by weight or less for strength reinforcement accordingly It was.

구리(Cu)를 0.8∼1.0중량%로 첨가한 이유는 매트릭스 조직중 퍼얼라이트 형성을 촉진하는 역할을 하므로 첨가하였고, 0.8% 이하이면 그 효과가 적고 1.0%이상 첨가시에는 지나치게 브리틀(Brittle)질 우려가 있으므로, 그 함량범위를 0.8∼1.0중량%로 한정하였다.The reason for adding copper (Cu) at 0.8 to 1.0% by weight was added because it promotes the formation of pearlite in the matrix structure. If it is less than 0.8%, the effect is small, and if more than 1.0% is too brittle, Since there is a risk of quality, the content range is limited to 0.8 to 1.0% by weight.

규소(Si)를 2.3∼2.5중량%로 첨가한 이유는 주철의 기본 5대 원소로서 첨가하지 않을 경우 흑연이 생성되지 않는 등의 문제로 반드시 첨가하여야 하는 성분이며, 2.3% 보다 소량 첨가시 주조성이 열악해지고, 2.5%를 넘게되면 퍼얼라이트 분해에 의한 페라이트(Ferrite) 생성 과다로 인장강도의 저하가 우려되므로, 그 함량범위를 2.3∼2.5중량%로 한정하였다.The reason why the amount of silicon (Si) is added in the range of 2.3 to 2.5% by weight is a component that must be added due to the problem that graphite is not produced if it is not added as the basic five major elements of cast iron. When the content is worse than 2.5%, there is a concern that the tensile strength is lowered due to excessive ferrite generation due to the decomposition of the ferrite. Therefore, the content range is limited to 2.3 to 2.5% by weight.

망간(Mn)을 0.8∼1.0중량%로 첨가시킨 이유는 주철의 기본 5대 원소로서 첨가된 것이고, 퍼얼라이트를 촉진하는 원소이며, 과량 첨가시키에 재질이 브리틀해질 수 있으므로, 그 함량범위를 2.3∼2.5중량%로 한정하였다.The reason for adding manganese (Mn) at 0.8 to 1.0% by weight is that it is added as the basic five major elements of cast iron, is an element that promotes ferrite, and the material may become brittle when excessively added. It was limited to 2.3 to 2.5% by weight.

인(P)을 0.1중량% 이하로 첨가시킨 이유는 주철의 기본 5대 원소로서 첨가된 것이고, 0.1중량% 이상으로 첨가하게 되면 탄화물이 생성되므로 0.1중량% 이하로 첨가시키는 것이 좋다.The reason why the phosphorus (P) is added at 0.1 wt% or less is added as the basic five major elements of cast iron, and when it is added at 0.1 wt% or more, it is preferable to add 0.1 wt% or less.

황(S)을 0.08중량% 이하로 첨가한 이유는 주철의 기본 5대 원소로서 첨가된 것이고, 0.08중량% 이상으로 첨가하게 되면 개재물이 생성되므로 0.08중량% 이하로 첨가시키는 것이 좋다.The reason for adding sulfur (S) at 0.08% by weight or less is that it is added as the basic five major elements of cast iron, and when added at 0.08% by weight or more, inclusions are generated.

크롬(Cr)을 0.1중량% 이하로 첨가한 이유는 매트릭스중에서 화합물을 형성하여 인장강도의 증대에 기여하므로 첨가하였고, 과량 첨가시 탄화물 형성으로 재질이 지나치게 브리틀해지므로, 0.1중량% 이하로 첨가시키는 것이 좋다.The reason for adding chromium (Cr) at 0.1 wt% or less is that it is added because it forms a compound in the matrix and contributes to the increase in tensile strength.Additionally, 0.1 wt% or less because the material becomes excessively brittle due to carbide formation. It is good to let.

칼슘(Ca)을 0.03중량% 이하로 첨가한 이유는 주철의 핵생성 사이트(Site)를 제공하여 원활한 흑연의 생성을 조장하는 역할을 위하여 첨가하였고, 소량의 첨가로 흑연의 길이를 조절하여 강도증대를 도모하기 위하여 첨가하였다. 단 0.03중량% 이상으로 첨가시에는 불순물로서 작용하므로 그 함량을 미량으로 제한하는 것이 좋다.The reason for adding less than 0.03% by weight of calcium (Ca) was added in order to provide a nucleation site of cast iron to promote the smooth production of graphite, and to increase the strength by controlling the length of the graphite with a small amount of addition. Was added to facilitate. However, when added to more than 0.03% by weight acts as an impurity it is good to limit the content to a small amount.

주석(Sn)을 0.03∼0.05중량%로 첨가한 이유는 구리와 유사하게 매트릭스 조직중에 퍼얼라이트 형성을 촉진하는 역할을 하도록 첨가시켰고, 0.03% 이하이면 그 효과가 적고 0.05%이상 첨가시에는 재질이 지나치게 브리틀(Brittle)질 우려가 있으므로, 그 함량범위를 0.03∼0.05중량%로 한정하였다.The reason why the tin (Sn) was added at 0.03 to 0.05% by weight was added to promote the formation of pearlite in the matrix structure similarly to copper. If the content is less than 0.03%, the effect is small. Since there is a possibility of brittle too much, the content range was limited to 0.03 to 0.05% by weight.

실시예 1Example 1

철(Fe)을 기본성분으로 하고, 여기에 탄소(C) 3.1중량%, 규소(Si) 2.36중량%, 망간(Mn) 0.85중량%, 인(P) 0.05중량%, 황(S) 0.06중량%, 구리(Cu) 0.83중량%, 크롬(Cr) 0.06중량%, 칼슘(Ca) 0.02중량%, 주석(Sn) 0.035중량%가 함유된 디젤엔진용 실린더헤드 조성물을 이용하여 통상의 주조방법으로 실린더 헤드를 제조하였다.Based on iron (Fe), carbon (C) 3.1% by weight, silicon (Si) 2.36% by weight, manganese (Mn) 0.85% by weight, phosphorus (P) 0.05% by weight, sulfur (S) 0.06% %, Copper (Cu) 0.83% by weight, chromium (Cr) 0.06% by weight, calcium (Ca) 0.02% by weight, tin (Sn) 0.035% by weight using a cylinder head composition for a diesel engine using a conventional casting method Cylinder heads were prepared.

실시예 1은 인장강도 31Kg급으로서 종래의 25Kg급 실린더헤드 조성물에 비하여 보다 나은 주조성 향상(수축불량 발생)을 위하여 Mo을 삭제하였고, 이에따른 강도보강을 위하여 원탕의 탄소(C)함량을 3.1중량% 이하로 조절하면서 구리(Cu)를 0.83중량% 첨가하였고, 매트릭스중의 퍼얼라이트(Pearlite) 생성 촉진을 위하여 퍼얼라이트 생성촉진에 효과적이고, 스크랩(Scrab)관리에도 효과적인 주석(Sn)을 0.035중량% 첨가하였다.Example 1 is 31Kg of tensile strength, and compared to the conventional 25Kg cylinder head composition to remove the Mo for a better castability improvement (occurrence of shrinkage), and thus to increase the carbon content of the raw water 3.1 0.83% by weight of copper (Cu) was added while controlling to less than% by weight, and 0.035 of tin (Sn), which is effective in promoting pearlite production and promoting scrap management, was promoted to promote pearlite production in the matrix. Wt% was added.

실시예 2Example 2

철(Fe)을 기본성분으로 하고, 여기에 탄소(C) 3.0중량%, 규소(Si) 2.4중량%, 망간(Mn) 0.85중량%, 인(P) 0.044중량%, 황(S) 0.056중량%, 구리(Cu) 0.85중량%, 크롬(Cr) 0.24중량%, 칼슘(Ca) 0.01중량%, 주석(Sn) 0.045중량%가 함유된 디젤엔진용 실린더헤드 조성물을 이용하여 통상의 주조 방법으로 실린더 헤드를 제조하였다.Based on iron (Fe), carbon (C) 3.0% by weight, silicon (Si) 2.4% by weight, manganese (Mn) 0.85% by weight, phosphorus (P) 0.044% by weight, sulfur (S) 0.056% by weight %, 0.85 wt% copper (Cu), 0.24 wt% chromium (Cr), 0.01 wt% calcium (Ca), 0.045 wt% tin (Sn) using a cylinder head composition for a diesel engine in a conventional casting method Cylinder heads were prepared.

인장강도를 보다 향상시키기 위하여 실시예 1의 구리(Cu)외에 크롬(Cr) 0.24중량%를 첨가하였고, 퍼얼라이트 생성량을 증대시키기 위해 주석(Sn)의 량을 0.045중량%로 다소 더 증대시켰다.In order to further improve the tensile strength, 0.24% by weight of chromium (Cr) was added to the copper (Cu) of Example 1, and the amount of tin (Sn) was slightly increased to 0.045% by weight to increase the amount of pearlite produced.

이러한 실시예 1,2의 화학적 조성은 다음의 표 3과 같고, 이러한 실시예 1,2의 실린더헤드 조성물을 이용하여 실린더헤드 제조강을 제조한 후, 물성시험(시험의 방법 및 시험 기기를 설명하여 주시기 바랍니다)을 하였는 바, 그 결과는 다음의 표 4와 같다.The chemical composition of Examples 1 and 2 is shown in Table 3 below, and after manufacturing the cylinder head manufactured steel using the cylinder head composition of Examples 1 and 2, the physical property test (explaining the test method and test equipment) The results are shown in Table 4 below.

위의 표 4에서 보는 바와 같이, 실시예 1,2 모두 가공부 표면과 심부의 경도가 증대되었음을 알 수 있었고, 인장강도는 각각 31Kgf/㎟, 34Kgf/㎟로 나타났으며, 그에따라 중형 상용 디젤엔진용 실린더헤드에 유용하게 채택할 수 있다.As shown in Table 4 above, in Examples 1 and 2, it was found that the hardness of the machined surface and the core were increased, and the tensile strengths were 31 Kgf / mm 2 and 34 Kgf / mm 2, respectively. It can be usefully employed in the cylinder head for the engine.

또한, 실시예 1,2 모두 흑연의 길이가 지나치게 증가하여 강도의 저하를 야기시키는 것을 방지하기 위하여 탄소(C)의 함량을 최대 3.1중량%까지로 제한하였으며, 탄소(C) 함량의 제한에 따른 주조성의 저하가 관찰되지 않았으며, 첨부한 도 1의 사진에서 관찰할 수 있는 바와 같이, 최대 흑연길이도 현미경 100배상으로 보았을 때 250㎛로 작게 관찰되어 매트릭스의 강화와 더불어 흑연길이의 감소에 따른강도 향상을 실현시킬 수 있었다.In addition, in Examples 1 and 2, the content of carbon was limited to a maximum of 3.1% by weight in order to prevent excessive increase in the length of the graphite, causing a decrease in strength. No decrease in castability was observed, and as can be observed in the accompanying photograph of FIG. 1, the maximum graphite length was also observed as small as 250 μm when viewed under a microscope of 100 times, resulting in the reduction of the graphite length with the strengthening of the matrix. It was possible to realize the improvement in strength.

또한, 칼슘(Ca)은 접종후에 슬래그 형태로 취출되거나 페이딩(Fading)되므로 스크랩(Scrab)관리에 영향을 주지 않는 것이 확인되었다.In addition, since calcium (Ca) is taken out in the form of slag or fading after inoculation, it was confirmed that it does not affect scrap management.

이상에서 본 바와 같이, 본 발명에 따른 디젤엔진용 실린더 헤드 조성물에 의하면, 중형 디젤엔진용 실린더헤드의 인장강도를 향상시키는 동시에 실린더헤드의 주조성을 크게 향상시킬 수 있는 잇점이 있다.As described above, the cylinder head composition for a diesel engine according to the present invention has the advantage of improving the tensile strength of the cylinder head for a medium-sized diesel engine and at the same time greatly improving the castability of the cylinder head.

Claims (3)

디젤엔진용 실린더헤드 조성물에 있어서,In the cylinder head composition for a diesel engine, 철(Fe)을 기본성분으로 하고, 여기에 탄소(C) 2.9∼3.1중량%, 규소(Si) 2.3∼2.5중량%, 망간(Mn) 0.8∼1.0중량%, 인(P) 0.1중량% 이하, 황(S) 0.08중량% 이하, 구리(Cu) 0.8∼1.0중량%, 크롬(Cr) 0.1중량% 이하, 칼슘(Ca) 0.03중량% 이하, 주석(Sn) 0.03∼0.05중량%가 함유된 것을 특징으로 하는 디젤엔진용 실린더헤드 조성물.Based on iron (Fe), carbon (C) 2.9-3.1 wt%, silicon (Si) 2.3-2.5 wt%, manganese (Mn) 0.8-1.0 wt%, phosphorus (P) 0.1 wt% or less , Sulfur (S) 0.08% or less, copper (Cu) 0.8-1.0% by weight, chromium (Cr) 0.1% or less, calcium (Ca) 0.03% or less, tin (Sn) 0.03-0.05% by weight Cylinder head composition for a diesel engine, characterized in that. 제 1 항에 있어서, 철(Fe)을 기본성분으로 하고, 여기에 탄소(C) 3.1중량%, 규소(Si) 2.36중량%, 망간(Mn) 0.85중량%, 인(P) 0.05중량%, 황(S) 0.06중량%, 구리(Cu) 0.83중량%, 크롬(Cr) 0.06중량%, 칼슘(Ca) 0.02중량%, 주석(Sn) 0.035중량%가 함유된 것을 특징으로 하는 디젤엔진용 실린더헤드 조성물.The method according to claim 1, wherein iron (Fe) is the basic component, wherein carbon (C) 3.1 wt%, silicon (Si) 2.36 wt%, manganese (Mn) 0.85 wt%, phosphorus (P) 0.05 wt%, A cylinder for a diesel engine, comprising 0.06% sulfur (S), 0.83% copper (Cu), 0.06% chromium (Cr), 0.02% calcium (Ca), and 0.035% tin (Sn) Head composition. 제 1 항에 있어서, 철(Fe)을 기본성분으로 하고, 여기에 탄소(C) 3.0중량%, 규소(Si) 2.4중량%, 망간(Mn) 0.85중량%, 인(P) 0.044중량%, 황(S) 0.056중량%, 구리(Cu) 0.85중량%, 크롬(Cr) 0.24중량%, 칼슘(Ca) 0.01중량%, 주석(Sn) 0.045중량%가 함유된 것을 특징으로 하는 디젤엔진용 실린더헤드 조성물.The method of claim 1, wherein the iron (Fe) as a base component, carbon (C) 3.0% by weight, silicon (Si) 2.4% by weight, manganese (Mn) 0.85% by weight, phosphorus (P) 0.044% by weight, A cylinder for diesel engines, comprising 0.056% by weight of sulfur (S), 0.85% by weight of copper (Cu), 0.24% by weight of chromium (Cr), 0.01% by weight of calcium (Ca), and 0.045% by weight of tin (Sn) Head composition.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10975458B2 (en) 2017-12-08 2021-04-13 Hyundai Motor Company High-strength gray cast iron

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Publication number Priority date Publication date Assignee Title
JPS60100649A (en) * 1983-11-02 1985-06-04 Kyoei Tokushu Chiyuukoushiyo:Kk Cast iron for diesel engine
KR960011209A (en) * 1994-06-26 1996-04-20 석진철 CV graphite cast iron for engine cylinder head
KR19980058370U (en) * 1997-02-21 1998-10-26 김무 Dry cylinder liners
WO2001038593A1 (en) * 1999-11-23 2001-05-31 Sintercast Ab New cast iron alloy and method for making the same
KR20010061818A (en) * 1999-12-29 2001-07-07 양재신 Low thermal expansion cast iron and manufacturing method thereof
KR20020044867A (en) * 2000-12-07 2002-06-19 이계안 Cast iron composition for casting cylinder head
KR20040037718A (en) * 2002-10-30 2004-05-07 현대자동차주식회사 Composition of cylinder liner for automobile and manufacturing method of cylinder liner using the same

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Publication number Priority date Publication date Assignee Title
JPS60100649A (en) * 1983-11-02 1985-06-04 Kyoei Tokushu Chiyuukoushiyo:Kk Cast iron for diesel engine
KR960011209A (en) * 1994-06-26 1996-04-20 석진철 CV graphite cast iron for engine cylinder head
KR19980058370U (en) * 1997-02-21 1998-10-26 김무 Dry cylinder liners
WO2001038593A1 (en) * 1999-11-23 2001-05-31 Sintercast Ab New cast iron alloy and method for making the same
KR20010061818A (en) * 1999-12-29 2001-07-07 양재신 Low thermal expansion cast iron and manufacturing method thereof
KR20020044867A (en) * 2000-12-07 2002-06-19 이계안 Cast iron composition for casting cylinder head
KR20040037718A (en) * 2002-10-30 2004-05-07 현대자동차주식회사 Composition of cylinder liner for automobile and manufacturing method of cylinder liner using the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10975458B2 (en) 2017-12-08 2021-04-13 Hyundai Motor Company High-strength gray cast iron

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