Ferritic martensitic iron based alloy, a component and a process

a technology of ferric martensitic iron and iron based alloy, which is applied in the field to a component and a process, can solve the problems of lower strength and toughness of ferric martensitic alloy compared to nickel-based superalloy, and achieve the effects of reducing the number of alloys

Inactive Publication Date: 2012-03-22
SIEMENS AG
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  • Abstract
  • Description
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Benefits of technology

[0005]It is therefore an object of the invention to propose an alloy by means of which the use temperature can be increased, and at the same time the strength is maximized and the toughness is retained especially for lower temperatures.

Problems solved by technology

Iron-based alloys are inexpensive alloys compared to nickel-based superalloys, but the strengths and toughnesses thereof are lower compared to the nickel-based superalloys.

Method used

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  • Ferritic martensitic iron based alloy, a component and a process
  • Ferritic martensitic iron based alloy, a component and a process
  • Ferritic martensitic iron based alloy, a component and a process

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Embodiment Construction

[0011]The prior art is formed by iron-based alloys, known from EP 0 867 523, in which use is made of tungsten.

[0012]With preference, the new ferritic-martensitic alloy dispenses with the addition of tungsten (W) except for the customary impurities, which lie considerably below 0.1% by weight, in particular below 0.01% by weight.

[0013]The tables in FIGS. 1 to 3 show some exemplary embodiments of the invention.

[0014]The iron-based alloy comprises, in an inconclusive list (in % by weight):[0015]carbon (C): 0.13-0.22,[0016]chromium (Cr): 9.0-9.8,[0017]molybdenum (Mo): 1.0-2.0, in particular 1.4-1.6,[0018]nickel (Ni): 0.3-0.8, in particular 0.3-0.7,[0019]vanadium (V): 0.25-0.35, in particular 0.25-0.3,[0020]aluminum (Al): 0.005-0.01,[0021]niobium (Nb): 0.04-0.06,[0022]boron (B): 20 ppm-70 ppm, in particular 35 ppm-55 ppm,[0023]nitrogen (N): 150 ppm-500 ppm,[0024]cobalt (Co): 0-1.5, in particular up to 1.3,[0025]manganese (Mn): 0-0.15,[0026]silicon (Si): 0-0.1,[0027]phosphorus (P): 0-0.00...

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Abstract

A novel ferritic martensitic alloy is provided. The ferritic martensitic alloy enables the use temperature to be increased from 500° C. to 550° C., where the strength is maintained or is even maximized and the toughness, especially for low temperatures, is maintained compared to the known iron-based alloys. Tunsten is preferably not used.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2009 / 003640, filed May 22, 2009 and claims the benefit thereof.FIELD OF INVENTION[0002]The invention relates to a ferritic-martensitic alloy, to a component and to a process.BACKGROUND OF INVENTION[0003]Iron-based alloys are inexpensive alloys compared to nickel-based superalloys, but the strengths and toughnesses thereof are lower compared to the nickel-based superalloys.[0004]Similarly, EP 1 466 993 B1 is known, in which use is made of tungsten.SUMMARY OF INVENTION[0005]It is therefore an object of the invention to propose an alloy by means of which the use temperature can be increased, and at the same time the strength is maximized and the toughness is retained especially for lower temperatures.[0006]The object is achieved by an alloy as claimed in the claims, by a component as claimed in the claims and by a process as claimed in the claims.[0007]The depen...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C38/44C22C38/42
CPCC22C38/001C22C38/06C22C38/54C22C38/46C22C38/48C22C38/44
Inventor KERN, TORSTEN-ULFKOLK, KARSTENRUDOLF, THORSTEN
Owner SIEMENS AG
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