KR20150075754A - Austenite stainless steel sheet for molten carbonate fuel cell and method for manufacturing the same - Google Patents
Austenite stainless steel sheet for molten carbonate fuel cell and method for manufacturing the same Download PDFInfo
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- KR20150075754A KR20150075754A KR1020130164016A KR20130164016A KR20150075754A KR 20150075754 A KR20150075754 A KR 20150075754A KR 1020130164016 A KR1020130164016 A KR 1020130164016A KR 20130164016 A KR20130164016 A KR 20130164016A KR 20150075754 A KR20150075754 A KR 20150075754A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/60—Compounds characterised by their crystallite size
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Fuel Cell (AREA)
Abstract
The present invention relates to austenitic stainless steel sheet for a molten carbonate fuel cell and a method for producing the same, and has a sufficiently large crystal grain diameter, a high content of nickel and chromium, excellent corrosion resistance, Austenitic stainless steel sheet for a molten carbonate fuel cell in which numerical strain due to stress is minimized, and a method for manufacturing the same.
Description
The present invention relates to austenitic stainless steel sheet for a molten carbonate fuel cell and a method of manufacturing the same, and more particularly, to austenitic stainless steel sheet for a molten carbonate fuel cell having minimized numerical strain due to thermal stress and having excellent corrosion resistance, .
The molten carbonate fuel cell is a power generation device that generates electricity using oxygen and hydrogen gas. Among the components mounted inside the molten carbonate fuel cell, portions using metal materials such as a separator plate, a wet seal area, , Current collectors and the like are operated at a high temperature of 650 ° C or higher and are easily corrosive due to the characteristics of a molten carbonate fuel cell which is exposed to various gases.
In order to prevent deterioration of the molten carbonate fuel cell due to such corrosion, Japanese Patent Application Laid-Open Nos. 6-260178, 7-7728, 1995-75575, Korean Patent Application No. 1995-0068695, 1996 -0022387, 10-2002-0083033, and 10-2007-0135798, nickel, aluminum, titanium, chromium, or the like is coated on the surface of a stainless steel plate used as a substrate of a separator to form a protective film Called double layer method has been studied. However, the method of coating the protective film on the surface of such a stainless steel plate is problematic in that the material used for the protective film is expensive, which causes an increase in manufacturing cost and is not suitable for mass production have.
For this reason, a single layer method using an austenitic stainless steel sheet having a high chromium content and a high nickel content is mainly used instead of the double layer method as described above. This is because Cr 2 O 3 And has a corrosion resistance due to its high corrosion resistance due to the high content of nickel, which is an internal material.
However, when the austenitic stainless steel sheet having a high chromium content and a high nickel content is used as a material for a separator for a molten carbonate fuel cell, a corrosion resistance effect can be obtained, but numerical deformation occurs due to a creep due to thermal stress There is a problem that the life of the separator is shortened.
The creep rate is inversely proportional to the grain size and is proportional to the grain boundary diffusion coefficient. The grain size is determined by temperature, time, grain boundary Strain energy and so on. Conventional high chromium and high nickel content austenitic stainless steel sheets were prepared by heating, hot rolling, cooling and annealing the steel slabs, which were annealed at a temperature of about 723 to 1050 ° C The austenitic stainless steel sheet produced through such a process has a problem in that the diameter of the crystal grains is not sufficiently large in the range of about () to (), and the creep occurrence rate is high. Therefore, it is necessary to find the heat treatment conditions that can lower the creep occurrence rate, that is, the heat treatment temperature, the temperature increase rate, and the time, which can lower the creep occurrence rate, by lowering the grain boundary strain energy and increasing the grain size.
Disclosure of Invention Technical Problem [8] The present invention provides austenitic stainless steel sheet for a molten carbonate fuel cell capable of minimizing numerical strain due to thermal stress and having excellent corrosion resistance and mass production at a relatively low cost The purpose.
Another object of the present invention is to provide a method of manufacturing austenitic stainless steel sheet for a molten carbonate fuel cell, which can be mass-produced at a relatively low cost while minimizing numerical strain due to thermal stress and having excellent corrosion resistance.
In order to attain the above object, the present invention is characterized in that the crystal grain diameter is in the range of 50 to 200 탆, and that 10 to 30 parts by weight of nickel and 15 to 30 parts by weight of chromium are contained with respect to 100 parts by weight of the austenitic stainless steel sheet Austenitic stainless steel sheets for molten carbonate fuel cells are provided.
The austenitic stainless steel sheet for a molten carbonate fuel cell may contain nickel in an amount of 11 to 15 parts by weight based on 100 parts by weight of the austenitic stainless steel sheet.
The austenitic stainless steel sheet for a molten carbonate fuel cell may contain chromium in an amount of 19 to 21 parts by weight based on 100 parts by weight of the austenitic stainless steel sheet.
The present invention also provides a method of manufacturing a steel slab, comprising: heating a steel slab and performing hot rolling; Cooling step; And a heat treatment step, wherein the heat treatment step is performed at a temperature of about 1000 to 1400 占 폚, the rate of temperature increase is 1 占 폚 / min to 10 占 폚 / min, and the peak temperature retention time is 1 hour to 10 hours A method of manufacturing an austenitic stainless steel sheet for a molten carbonate fuel cell is provided.
The steel slab may contain 10 to 30 parts by weight of nickel and 15 to 30 parts by weight of chromium based on 100 parts by weight of the steel slab.
When the austenitic stainless steel sheet of high chromium and high nickel content of the present invention is used, the corrosion resistance is excellent and the numerical strain due to thermal stress is minimized, so that the life of the separator for molten carbonate fuel cells can be prolonged, It has an effect of mass production at a relatively low cost as compared with a method of coating a protective film on the surface of a steel sheet.
Hereinafter, the present invention will be described in more detail. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention, and the singular forms as used herein include the plural forms as well, provided that the phrases do not expressly contradict it. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.
Hereinafter, an austenitic stainless steel sheet for a molten carbonate fuel cell having excellent corrosion resistance and minimizing numerical strain due to thermal stress according to an embodiment of the present invention will be described.
The austenitic stainless steel sheet for a molten carbonate fuel cell according to an embodiment of the present invention may have a crystal grain diameter of about 50 to 200 mu m and may contain about 10 to 30 parts by weight of nickel, 15 to 30 parts by weight.
Since the creep rate of the separator for a molten carbonate fuel cell is inversely proportional to the size of the crystal grains, the creep occurrence rate can be reduced by controlling the size of the crystal grains to about 50 to 200 mu m, preferably about 150 to 200 mu m. The grain diameter in the range of about 50 to 200 mu m corresponds to a size of about 2 to 6 on the basis of ASTM E112 (standard test method for determining average grain size) grain size number.
Nickel contained in the austenitic stainless steel sheet for a molten carbonate fuel cell is used as an austenite stabilizer. As the content of nickel increases, the austenite fraction in the stainless steel sheet increases and the corrosion resistance increases. When the content of nickel is small, ferritic stainless steel can be produced, not austenite, and the corrosion resistance increases as the content of nickel increases, but it is not suitable for mass production because the price of nickel is high. Therefore, the nickel contained in the austenitic stainless steel sheet for a molten carbonate fuel cell may be included in an amount of about 10 to 30 parts by weight, preferably about 11 to 15 parts by weight, based on 100 parts by weight of the stainless steel sheet.
The chromium contained in the austenitic stainless steel sheet for a molten carbonate fuel cell is oxidized to form a protective film of Cr 2 O 3 on the surface of the stainless steel sheet, and is an effective element particularly for suppressing formation of a high-temperature scale. It also has an effect of preventing coarsening of austenite grains at a high temperature of 1000 ° C or higher. In order to improve corrosion resistance and high temperature properties, it is effective to contain at least 15 parts by weight, but if it is contained excessively, the strength is greatly increased and the formation of δ-ferrite leads to deterioration of corrosion resistance and hot workability, The chromium included in the austenitic stainless steel sheet for a fuel cell may be contained in an amount of about 15 to 30 parts by weight, preferably about 19 to 21 parts by weight, based on 100 parts by weight of the stainless steel sheet.
The austenitic stainless steel sheet for a molten carbonate fuel cell according to an embodiment of the present invention has a sufficiently large grain diameter as compared with a conventional austenitic stainless steel sheet and has a low occurrence rate of creep so that numerical strain due to thermal stress can be minimized It has a high content of nickel and chromium and is excellent in corrosion resistance.
Hereinafter, a method for manufacturing austenitic stainless steel sheet for a molten carbonate fuel cell having excellent corrosion resistance and minimizing numerical strain due to thermal stress according to an embodiment of the present invention will be described.
A method of manufacturing austenitic stainless steel sheet for a molten carbonate fuel cell according to an embodiment of the present invention includes heating, hot rolling, cooling, and heat treating a steel slab, wherein the heat treatment is performed at a temperature of about 1000 to 1400 DEG C , The rate of temperature rise can be from about 1 占 폚 / min to 10 占 폚 / min, and the peak temperature retention time can be from about 1 hour to 10 hours.
The creep rate is inversely proportional to grain size and is proportional to the grain boundary diffusion coefficient, which is affected by temperature, time, grain boundary strain energy, and the like. That is, in order to lower the creep occurrence rate, the grain size diffusion coefficient should be small and the grain size should be large. Since the grain size is a function of temperature, time and strain strain energy, the grain size can be controlled by heat treatment. Therefore, in order to lower the creep incidence, a heat treatment is performed at a temperature of about 1000 to 1400 占 폚 at a heating rate of 1 to 10 占 폚 / min and a peak temperature holding time of 1 to 10 hours instead of the annealing treatment in the conventional austenitic stainless steel sheet manufacturing method , The grain boundary strain energy is reduced and the grain size is increased, so that an austenitic stainless steel sheet having a crystal grain diameter sufficiently large in the range of about 50 to 200 mu m can be produced.
The steel slab may include about 10 to 30 parts by weight of nickel and about 15 to 30 parts by weight of chromium based on 100 parts by weight of the steel slab.
The nickel is used as an austenite stabilizer, and as the content of nickel increases, the austenite fraction present in the stainless steel sheet increases and the corrosion resistance increases. When the content of nickel is small, ferritic stainless steel can be produced, not austenite, and the corrosion resistance increases as the content of nickel increases, but it is not suitable for mass production because the price of nickel is high. Accordingly, the nickel included in the steel slab may be included in an amount of about 10 to 30 parts by weight, preferably about 11 to 15 parts by weight, based on 100 parts by weight of the steel slab.
The chromium is oxidized to form a protective film of Cr 2 O 3 on the surface of the stainless steel plate, and is an effective element particularly for suppressing formation of a high-temperature scale. It also has an effect of preventing coarsening of austenite grains at a high temperature of 1000 ° C or higher. In order to improve corrosion resistance and high-temperature properties, it is effective to contain at least 15 parts by weight. However, if it is contained excessively, the strength is greatly increased and deterioration of corrosion resistance and hot workability is caused by formation of? -Ferrite, May be contained in an amount of about 15 to 30 parts by weight, preferably about 19 to 21 parts by weight, based on 100 parts by weight of the steel slab.
The method of manufacturing austenitic stainless steel sheet for a molten carbonate fuel cell according to an embodiment of the present invention is a method for manufacturing austenitic stainless steel sheet in which a grain boundary strain energy is reduced and a grain size can be increased By including the heat treatment step, the crystal grain diameter is sufficiently larger than that of the conventional austenitic stainless steel sheet producing method, the creep incidence is low, the numerical strain due to thermal stress can be minimized, and nickel and chromium are contained in a high content So that an austenitic stainless steel sheet excellent in corrosion resistance can be produced.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (5)
Wherein the nickel is contained in an amount of 11 to 15 parts by weight based on 100 parts by weight of the austenitic stainless steel sheet.
Wherein the chromium is contained in an amount of 19 to 21 parts by weight based on 100 parts by weight of the austenitic stainless steel sheet.
Cooling step; And
And a heat treatment step,
Wherein the heat treatment step is performed at a temperature of about 1000 to 1400 占 폚, the rate of temperature increase is from 1 占 폚 / min to 10 占 폚 / min, and the duration of peak temperature is from 1 hour to 10 hours. A method of manufacturing a stainless steel plate.
Wherein the steel slab comprises 10 to 30 parts by weight of nickel and 15 to 30 parts by weight of chromium based on 100 parts by weight of the steel slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130164016A KR20150075754A (en) | 2013-12-26 | 2013-12-26 | Austenite stainless steel sheet for molten carbonate fuel cell and method for manufacturing the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130164016A KR20150075754A (en) | 2013-12-26 | 2013-12-26 | Austenite stainless steel sheet for molten carbonate fuel cell and method for manufacturing the same |
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| KR20150075754A true KR20150075754A (en) | 2015-07-06 |
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| KR1020130164016A KR20150075754A (en) | 2013-12-26 | 2013-12-26 | Austenite stainless steel sheet for molten carbonate fuel cell and method for manufacturing the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102326257B1 (en) * | 2021-05-31 | 2021-11-16 | 주식회사 포스코 | Steel plate with excellent hydrophilicty and conductivity |
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2013
- 2013-12-26 KR KR1020130164016A patent/KR20150075754A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102326257B1 (en) * | 2021-05-31 | 2021-11-16 | 주식회사 포스코 | Steel plate with excellent hydrophilicty and conductivity |
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