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High-cr high-ni austenitic heat-resistant cast steel and exhaust system component produced from same

By optimizing the elemental composition of high Cr and high Ni austenitic heat-resistant cast steel, the high-temperature yield point and oxidation resistance of motor vehicle engine exhaust system parts are improved, and the problems of insufficient oxidation resistance and durability in the existing technology are solved. problem, achieving long life and efficient performance in high temperature environments.

Active Publication Date: 2007-04-04
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the peeling of the oxide film not only contaminates the catalyst, but also causes damage to the turbine blade of the turbocharger, which becomes the cause of failure.

Method used

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  • High-cr high-ni austenitic heat-resistant cast steel and exhaust system component produced from same
  • High-cr high-ni austenitic heat-resistant cast steel and exhaust system component produced from same
  • High-cr high-ni austenitic heat-resistant cast steel and exhaust system component produced from same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～47

[0086] Examples 1 to 47, Comparative Examples 1 to 14

[0087] Table 1-1 to Table 1-4 show the chemical composition of the heat-resistant cast steel test materials of Examples 1 to 47, and Table 2-1 to Table 2-2 show the heat-resistant cast steel test materials of Comparative Examples 1 to 14 Chemical composition. Comparative Examples 1 to 8 are cast steels with excessive Al content, Comparative Example 9 is cast steels with excessive N content, Comparative Example 10 is cast steels with excessive N content, and Comparative Examples 11 and 12 are cast steels with O content. Too much cast steel, and Comparative Example 13 is a cast steel with too much O and N content. In addition, Comparative Example 14 is an example of the high Cr and high Ni austenitic heat-resistant cast steel described in JP 2000-291430 A.

[0088] Using a 100kg high-frequency melting furnace (alkaline lining), the cast steels of Examples 1 to 47 and Comparative Examples 1 to 14 were melted in the atmosphere, t...

Embodiment 48

[0118] After the cast steel of Example 36 was melted in the atmosphere using a 100kg high-frequency melting furnace (alkaline lining), the steel was tapped into a ladle at 1550°C or higher, and immediately poured into the turbine housing 32 shown in Fig. 3 at a temperature of 1500°C or higher. Used sand molds. In order to achieve weight reduction, the wall thickness of the main part of the turbine housing 32 is made 5.0 mm or less. In addition, machining is performed on the flange of the turbine housing 32 and the like. In the obtained turbine housing 32, gas defects such as pinholes and bubbles, casting defects such as pores and stagnation were not confirmed, and there were no cutting defects due to machining, abnormal wear and damage of cutting tools, and the like.

[0119] The turbine housing 32 of this embodiment was assembled on an exhaust simulator of an in-line 4-cylinder high-performance gasoline engine (gasolineengine) equivalent to a displacement of 2000cc, and a fatigue...

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Abstract

Disclosed is a high-Cr high-Ni austenitic heat-resistant cast steel having a composition mainly containing C, Si, Mn, Cr, Ni, W and / or Mo, and Nb, and further containing, in weight%, 0.01-0.5% of N, not more than 0.23% of Al, not more than 0.07% of O and the balance of Fe and unavoidable impurities. Since this high-Cr high-Ni austenitic heat-resistant cast steel is excellent in high-temperature resistance, oxidation resistance and thermal fatigue life, it is preferably used for exhaust system components.

Description

Technical field [0001] The present invention relates to a high-Cr and high-Ni austenitic heat-resistant cast steel with excellent thermal fatigue life at 1000°C or higher, and exhaust system parts for automobile engines composed of the high-Cr and high-Ni austenitic cast steel. Background technique [0002] Historically, exhaust system components such as exhaust manifolds and turbine housings for automobile engines have been made of corrosion-resistant high-nickel cast iron (Ni-Cr-Cu series austenitic cast iron). Manufacture of heat-resistant cast iron and ferrite-based heat-resistant cast steel. However, corrosion-resistant high-nickel cast iron has relatively high strength when the exhaust temperature reaches 900°C, but at temperatures exceeding 900°C, its oxidation resistance and crack resistance are reduced, and heat resistance and durability are poor. In addition, in the ferritic heat-resistant cast steel, when the exhaust gas temperature reaches 950°C or higher, there is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60F01N3/28F01N7/16F02B39/00F01N13/16F01N13/18
CPCC22C38/02C22C38/002C22C38/34F01N13/1861C22C38/04C22C38/44C22C38/60C22C38/06C22C38/48F01N13/16F01N2530/04C22C38/58C22C38/001C22C38/40
Inventor 林启次郎伊藤贤儿大平章永大塚公辉
Owner PROTERIAL LTD
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