Heat resist cast iron for exhaust system of automobile

专利摘要:
PURPOSE: A cast iron composition for exhaust system of automobile engine is provided which can be usefully applied to mechanical parts for automobile engine such as exhaust manifold and turbo charger housing by improving oxidation resistance and high temperature strength and enabling weight reduction due to reduction of actual thickness. CONSTITUTION: The cast iron composition for exhaust system of automobile engine comprises 4.0 to 4.6 wt.% of silicon (Si), 0.3 to 0.7 wt.% of chromium (Cr), 0.4 to 0.8 wt.% of molybdenum (Mo), 3.0 to 3.3 wt.% of carbon (C), 0.6 wt.% or less of manganese (Mn), 0.04 wt.% or less of phosphorus (P), 0.02 wt.% or less of sulfur (S), and 0.04 to 0.065 wt.% of magnesium (Mg), wherein content of silicon is preferably in the range of 4.0 to 4.6 wt.% since oxidation resistance is insufficient in case that the content of silicon is lower than the range while brittleness is increased in case that the content of silicon is higher than the range, content of chromium is preferably in the range of 0.3 to 0.7 wt.% since heat resistance is insufficient if the content of chromium is deviated from the range, and content of molybdenum is preferably in the range of 0.4 to 0.8 wt.% to improve strength of the exhaust system of automobile engine at a high temperature since high temperature strength is insufficient if the content of molybdenum is deviated from the range.
公开号:KR20030028909A
申请号:KR1020010061202
申请日:2001-10-04
公开日:2003-04-11
发明作者:정승철
申请人:현대자동차주식회사；
IPC主号:

专利说明:

Heat resist cast iron for exhaust system of automobile}
[4] 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.
[5] 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.
[6] 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).
[7] Therefore, there was a need for the development of materials capable of reinforcing oxidation resistance and high temperature strength.
[8] 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.
[9] 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.
[1] Figure 1 shows the penetration failure phenomenon by oxidation.
[2] Figure 2 shows the results of the oxidation resistance test of the Examples and Comparative Examples according to the present invention as a histogram.
[3] 3 is a histogram of the results of the high temperature tensile strength test of Examples and Comparative Examples according to the present invention.
[10] Hereinafter, the cast iron composition for automobile engine exhaust system of the present invention will be described in more detail.
[11] 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).
[12] 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.
[13] 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).
[14] 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. .
[15] Examples and Comparative Examples 1 to 3:
[16] 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.
[17]
[18] 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.

权利要求:
Claims (1)
[1" claim-type="Currently amended] 4.0 to 4.6 wt% silicon (Si), 0.3 to 0.7 wt% chromium (Cr) and 0.4 to 0.8 wt% molybdenum (Mo), 3.0 to 3.3 wt% carbon (C), 0.6 wt% or less manganese (Mn), phosphorus (P) Cast iron composition for automobile engine exhaust system comprising 0.04% by weight or less, sulfur (S) 0.02% by weight, magnesium (Mg) 0.04 to 0.065% by weight.

类似技术:

---

公开号 | 公开日 | 专利标题

---

Alaneme et al.2013|Fabrication characteristics and mechanical behaviour of rice husk ash–Alumina reinforced Al-Mg-Si alloy matrix hybrid composites

---

EP0016225B1|1982-04-21|Use of an austenitic steel in oxidizing conditions at high temperature

---

US7153373B2|2006-12-26|Heat and corrosion resistant cast CF8C stainless steel with improved high temperature strength and ductility

---

US6881280B2|2005-04-19|Iron-based alloy for internal combustion engine valve seat inserts and the like

---

US8277533B2|2012-10-02|Powder metallurgy composition

---

CN101526046B|2011-04-06|Piston ring

---

DE10252240C5|2019-04-18|Ferrite nodular cast iron and its use in an exhaust system

---

JP5669392B2|2015-02-12|Steel material with high silicon content for the production of piston rings and cylinder liners

---

KR101727426B1|2017-04-14|High-strength, high-damping-capacity cast iron

---

JP4584158B2|2010-11-17|Valve seat material made of iron-based sintered alloy for internal combustion engines

---

DE4031408C2|1993-10-07|Sintered machine part

---

JP3520093B2|2004-04-19|Secondary hardening type high temperature wear resistant sintered alloy

---

DE102009004189B4|2013-07-25|Component of a cast iron alloy, in particular for cylinder heads

---

CN104357736B|2015-11-25|A kind of vanadium titanium vermicular cast iron

---

EP0418943B1|1994-06-22|Sintered materials

---

EP1931810B1|2011-11-02|High silicon niobium casting alloy and process for producing the same

---

JP5484899B2|2014-05-07|Ferrous sintered alloy for valve seat and valve seat for internal combustion engine

---

KR20140080643A|2014-07-01|Compacted graphite iron, engine cylinder head and vehicle

---

JP3853100B2|2006-12-06|Copper alloy with excellent wear resistance

---

JP4648559B2|2011-03-09|Heat-resistant aluminum die-cast product

---

CN101484597B|2011-03-30|Wear resistant high temperature alloy

---

WO2005085488A1|2005-09-15|Heat resisting cast iron and exhaust system part therefrom

---

JP5232620B2|2013-07-10|Spheroidal graphite cast iron

---

KR20020018152A|2002-03-07|Material for valve guides

---

DE102010024488A1|2011-12-22|Nickel-based alloy

同族专利:

---

公开号 | 公开日

---

引用文献:

---

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

---

法律状态:
2001-10-04|Application filed by 현대자동차주식회사

---

2001-10-04|Priority to KR1020010061202A

---

2003-04-11|Publication of KR20030028909A

优先权:

---

申请号 | 申请日 | 专利标题

---

KR1020010061202A|KR20030028909A|2001-10-04|2001-10-04|Heat resist cast iron for exhaust system of automobile|