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High alloy iron, use of the material for structural components that are subject to high thermal stress and corresponding structural component

A component and cast iron technology, applied in the field of high-alloy cast iron materials, can solve problems such as heat resistance decline and fuel exhaustion

Inactive Publication Date: 2009-08-26
EISENWERK ERLA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in thin-walled components with a wall thickness of less than 8 mm, the thermal resistance drops to only about 950°C
In order to reduce the temperature to this maximum allowable level, injection and combustion are carefully adjusted with expensive engine controllers, which in turn uses up more fuel again

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] A particularly advantageous combination of the invention provides that the cast iron material has 0.5-1.5% manganese. The manganese content in the alloy affects the castability on the one hand, but also reduces graphite precipitation on the other hand, so in this case the manganese content is preferably limited to 1.5%.

[0011] In accordance with a further advantageous combination of the invention, the material has less than 0.1% phosphorus, since higher proportions of phosphorus can also lead to brittleness of the material. Furthermore, it is advantageous for the material to have less than 0.5% copper.

[0012] A particularly preferred combination of the invention provides that the cast iron material contains 34-36% nickel. This proportion of nickel has the function of building an austenitic basic structure.

[0013] Another advantageous combination of the invention provides that the material preferably has 1.5 to 2.5% chromium in order to increase the high temperat...

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PUM

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Abstract

The invention relates to a high alloy cast iron with austenitic structure and ductile graph configuration, which includes the following components expressed in weight percentages: carbon <2.0%, silicon 2.0-6.0%, nickel 29-36%, chromium 1.0-2.5% %, niobium 0.1~1.0% and molybdenum 0.1~2.5%. The invention also relates to the use of this cast iron material for components subject to high thermal stresses, in particular for exhaust manifolds and turbocharger housings of independent or integral internal combustion engines. The invention finally relates to components subjected to high thermal stresses, in particular to exhaust systems of engines composed of the above-mentioned cast iron materials.

Description

technical field [0001] The invention refers to a high-alloy cast iron material with an austenitic structure and a nodular configuration. The structure according to the invention is particularly suitable for those parts of the engine which are under great thermal stress, in particular the exhaust system of the engine, but also for other components which are under high thermal stress. Background of the invention [0002] Due to the introduction of new combustion methods, the thermal stress on exhaust manifolds and turbocharger housings has increased substantially. The exhaust temperature of a modern Otto engine, specifically, generally reaches above 1000°C. Components subjected to such thermal stress must, in addition to high temperature resistance, have high antifouling ability, good resistance to temperature fluctuations, and low temperature expansion coefficient. Therefore, it is known from the prior art that components under high thermal stress are made of cast steel. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/08
CPCF01N13/10C22C37/08F01N13/16F01N2530/04
Inventor 霍斯特·凯尔迪特马尔·哈恩
Owner EISENWERK ERLA GMBH