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Cast iron alloy
| Details |
Inventors: Menk, Werner;
Assignee: Georg Fischer Fahrzeugtechnik AG (Schaffhausen, CH)
Primary Examiner: Wyszomierski; George
Assistant Examiner:
Attorney, Agent or Firm: Bachman & LaPointe, P.C.
The invention proposes a cast iron alloy for cast iron products which are highly thermally stable, the alloy containing, as nonferrous constituents, at least the elements C, Si, Mo, Al and, as admixtures, Ni, Mg and/or S, and the C content being less than 2.9% by weight. The alloy is used, for example, to produce exhaust manifolds or turbocharger casings. |
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DETAILED DESCRIPTION In accordance with the present invention, the alloy should have the highest possible structure stability and be as resistant as possible to oxidation.
The foregoing is achieved by providing a Si content of between 4.
7 to 5.
2% by weight and an Al content of between 0.
5 to 0.
9% by weight.
Molybdenum is added in an amount of between 0.
5 to 0.
9% by weight.
The invention provides a cast iron alloy which has a transformation temperature of more than 950.
degree.
C.
, has no disruptive expansion properties when used in conjunction with internal combustion engines and which can be produced as inexpensively as possible in a casting process.
The graphite in the cast iron alloy may be spheroidal or vermicular.
The amount of nickel added remains restricted to 0.
1 to 1% by weight.
Magnesium and silicon may be present in trace amounts of up to 0.
05% by weight.
It has proven particularly advantageous to add zirconium in the range from 0.
1 to 0.
4% by weight immediately before it is cast into its final shape.
Zirconium has a favorable influence on the oxidation resistance and the mechanical strength.
The zirconium may be added in the form of a prealloy.
EXAMPLE 1 An exhaust manifold for an internal combustion engine of a passenger car made from nodular cast iron with the following chemical composition in percent by weight: 2.
6 C, 5.
1 Si, 0.
1 Ni, 0.
6 Mo, 0.
6 Al, 0.
6 Zr, 0.
04 Mg and less than 0.
01 S has a ferritic microstructure.
Measurements carried out in a dilatometer result in a longitudinal linear expansion coefficient of 16.
10.
sup.
-16/K, which makes it possible to conclude that the transformation temperature is over 950.
degree.
C.
In a hot tensile test at a temperature of 300.
degree.
C.
, the following mechanical strength values were determined: Rp.
sub.
0.
2=575 N/mm.
sup.
2, Rm=600 N/mm.
sup.
2 and A=0.
4%.
EXAMPLE 2 An exhaust manifold for an internal combustion engine of a passenger car made from cast iron with vermicular graphite having the following chemical composition in percent by weight: 2
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Manufacturing Materials 
