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Cast iron containing niobium and component

a technology of niobium and cast iron, which is applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve the problems of significant decrease in toughness, and achieve the effect of improving mechanical strength

Inactive Publication Date: 2014-01-30
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patent is to provide an alloy and component that overcome the disadvantages of existing materials and have better mechanical strengths over their lifetime.

Problems solved by technology

Over time, however, these elements lead to a significant decrease in the toughness.

Method used

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  • Cast iron containing niobium and component
  • Cast iron containing niobium and component
  • Cast iron containing niobium and component

Examples

Experimental program
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Effect test

Embodiment Construction

[0027]The component with the alloy has an optimal ferritic microstructure with nodular graphite.

[0028]The table shows exemplary alloys according to the invention which have improved mechanical properties.

CSiMoCoNbMgMnPSSb13.23.50.500.50.040.20.030.0050.000923.33.60.500.10.050.20.030.0050.000333.72.71.00.90.40.050.20.030.0050.000443.52.41.000.50.060.30.030.0040.000252.33.90.500.40.030.30.030.0070.003063.33.40.51.00.50.040.20.020.0050.003073.33.40.50.50.50.040.20.020.0050.003983.03.30.400.20.050.20.030.0040.0014

[0029]The alloy preferably contains no vanadium (V) and / or titanium (Ti) and / or tantalum (Ta) and / or copper (Cu).

[0030]The ratio of C and Si should give an almost-eutectic composition, i.e. should correspond to a carbon equivalent CE of between 4.1% and 4.4%,

(CE=%byweightC+%byweightSi+%byweightP3).

[0031]FIG. 1 shows a steam turbine 300, 303 having a turbine shaft 309 extending along an axis of rotation 306.

[0032]The steam turbine comprises a high-pressure turbine part 300 and a...

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Abstract

Known cast iron alloys have use limits in respect of the temperature. An alloy (in a weight percentage) including silicon 2.0%-4.5%, carbon 2.9%-4.0%, niobium 0.05%-0.7%, molybdenum 0.3%-1.5%, optionally cobalt 0.1%-2.0%, manganese≦0.3%, nickel≦0.5%, magnesium≦0.07%, phosphorus≦0.05%, sulphur≦0.012%, chromium≦0.1%, antimony≦0.004%, and, iron, is provided.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2012 / 054941 filed Mar. 21, 2012 and claims benefit thereof, the entire content of which is hereby incorporated herein by reference. The International Application claims priority to the European Patent Office application No. 11162635.4 EP filed Apr. 15, 2011, the entire contents of which is hereby incorporated herein by reference.FIELD OF INVENTION[0002]The invention relates to a cast iron containing niobium as claimed in the claims and to a component as claimed in the claims.BACKGROUND OF INVENTION[0003]The known cast iron alloys now employed (so-called GJS alloys: nodular cast iron) primarily use silicon and molybdenum to increase the creep strength, scaling resistance and LCF behavior. Over time, however, these elements lead to a significant decrease in the toughness.[0004]Molybdenum furthermore exhibits a very high susceptibility to segregation.SUMMARY OF ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C37/10C22C37/06
CPCC22C37/06C22C37/10C22C33/08C22C37/04F01D5/28F01D25/24
Inventor DEKKER, LUTZGUNTHER, GUIDOJANSSEN, STEFANLANGE, SUSANNESCHOLZ, ALFREDSHENG, SHILUNTONN, BABETTEVIERBAUM, MARKWANJURA, STEFAN
Owner SIEMENS AG