Ferritic stainless steel having high temperature creep resistance

a stainless steel and high temperature technology, applied in the field of ferrritic stainless steel having high temperature, can solve the problems of reducing operating efficiency, poor conductor of electricity, brittle ceramics, etc., and achieve the effect of increasing the overall efficiency of the cell and high efficiency
US20040050462A1Inactive Publication Date: 2004-03-18GRUBB JOHN F
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
GRUBB JOHN F
Publication Date
2004-03-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

A ferritic stainless steel having improved high temperature mechanical properties includes greater than 25 weight percent chromium, 0.75 up to 1.5 weight percent molybdenum, up to 0.05 weight percent carbon, and at least one of niobium, titanium, and tantalum, wherein the sum of the weight percentages of niobium, titanium, and tantalum satisfies the following equation: 0.4<=(% Nb+% Ti+½(% Ta))<=1. The coefficient of thermal expansion of the ferritic stainless steel is within 25 percent of the CTE of stabilized zirconia between 20° C. (68° F.) and 1000° C. (1832° F.), and the steel exhibits at least one creep property selected from creep rupture strength of at least 1000 psi at 900° C. (1652° F.), time to 1% creep strain of at least 100 hours at 900° C. (1652° F.) under load of 1000 psi, and time to 2% creep strain of at least 200 hours at 900° C. (1652° F.) under load of 1000 psi. The steel is particularly suited for high temperature applications including, but not limited to, current collecting interconnects in solid oxide fuel cells, furnace hardware, equipment for the chemical process, petrochemical, electrical power generation, and pollution control industries, and equipment for handling molten copper and other molten metals.
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Description

[0001] Not applicable.

[0002] Not applicable.TECHNICAL FIELD AND INDUSTRIAL APPLICABILITY OF THE INVENTION

[0003] The present invention is directed to a ferritic stainless steel alloy. More particularly, the present invention is directed to a ferritic stainless steel alloy having microstructural stability and mechanical properties making it particularly suited for high temperature applications. Such applications include, but are not limited to, current collecting interconnects in solid oxide fuel cells, furnace hardware, equipment for the chemical process, petrochemical, electrical power generation, and pollution control industries, and equipment for handling molten copper and other molten metals.DESCRIPTION OF THE INVENTION BACKGROUND

[0004] Fuel cells are highly efficient, environmentally friendly means for generating electric power. The basic principle behind the operation of fuel cells is the generation of electricity by the combustion of fuel. The fuel is separated from an oxidize...

Claims

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