Al-contained heatproof ferrite series stainless steel for fuel cell and manufacturing method thereof
A fuel cell, manufacturing method technology, applied in the direction of manufacturing tools, final product manufacturing, sustainable manufacturing/processing, etc., can solve problems such as unclear manufacturing methods
Active Publication Date: 2013-09-11
NIPPON STEEL STAINLESS STEEL CORP
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Problems solved by technology
On the other hand, regarding the oxidation resistance of the Al-based oxide film, there is no document that studies Ti and Nb, which are stabilizing elements for ferritic stainless steel, for improving corrosion resistance and workability.
That is, regarding the oxidation resistance and creep rupture life, which are the above-mentioned problems of stainless steel for fuel cells, heat-resistant ferrite that uses trace elements such as Ti and Nb without relying on high alloying and addition of expensive elements System stainless steel and its manufacturing method are still unclear
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[0064] Hereinafter, examples in which the steel of the present invention is a steel plate will be described.
[0065] Al-containing ferritic stainless steel having the composition shown in Table 3 was melted and then hot-rolled to produce a hot-rolled sheet having a thickness of 4.0 to 5.0 mm. Steel Nos. 1 to 9 have the component ranges prescribed by the present invention. Steel Nos. 10 to 17 deviated from the range of components specified in the present invention.
[0066]
[0067] Using steel Nos. 1 to 4 and 10 to 17, steel plates with sample numbers (sample numbers) 1 to 12 and 24 to 31 were produced under the following manufacturing conditions. The annealing of the hot-rolled sheet was omitted, and the thickness of 1.2mm was formed by cold rolling, and the finishing annealing was performed at 850-950°C. After finish annealing, cooling is performed by gas cooling (10°C / sec), water cooling (>100°C / sec) or air cooling (5°C / sec). In addition, using steel Nos. 5 to 9, ste...
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The invention relates to an Al-contained heatproof ferrite series stainless steel for a fuel cell and manufacturing method thereof, The Al-contained heatproof ferrite series stainless steel for the fuel cell contains, based on the mass percent, lower than 0.01% of C, 0.15 to 0.7% of Si, below 0.3% of Mn, below 0.35% of P, below 0.003% of S, 13 to 20% of Cr, 1.5 to 6% of Al, below 0.01% of N, 0.03 to 0.5% of Ti, below 0.6% of Nb and the balance of Fe and inevitable impurities, the solid solution Ti amount in the steel is [Ti], the solid solution Ti amount is [Nb], under the condition of 13%<=Cr<=16%, the relation of [Ti] and [Nb] meets the flowing formula (a), under the condition of 16%<=Cr<=20%, the relation of [Ti] and [Nb] meets the flowing formula (b), wherein, 0<=[Ti]<=[Nb]+0.05, 0<[Nb]<=0.6% (a), 0<=[Ti]<=1 / 2X[Nb]+0.15, 0<[Nb]<=0.6% (b).
Description
technical field [0001] The present invention relates to Al-containing high-temperature components suitable for high-temperature parts of fuel cells that use methane, natural gas, city gas, propane, kerosene, etc. as fuels, have excellent oxidation resistance in an atmosphere containing high-temperature water vapor, and have good creep rupture life. Heat-resistant ferritic stainless steel and its manufacturing method. Background technique [0002] From the depletion of fossil fuels represented by oil, CO 2 From the viewpoint of global warming due to emissions, there has been a demand for practical use and popularization of new systems that replace conventional power generation systems. Among them, the popularization of solid polymer fuel cells (PEFC) and solid oxide fuel cells (SOFC), which are green power generation systems, has been promoted. [0003] In these fuel cells, hydrocarbon-based fuels such as methane, natural gas, city gas, propane, and kerosene are used as fue...
Claims
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IPC IPC(8): C22C38/50C22C38/54C21D8/02C21D9/46
CPCY02E60/50Y02P70/50C21D7/13C21D8/005C21D9/0081C22C38/005C22C38/02C22C38/06C22C38/26C22C38/28
Inventor 秦野正治井上宜治池上修深谷益启高桥明彦
Owner NIPPON STEEL STAINLESS STEEL CORP