H - Electricity – 01 – M
Patent
H - Electricity
01
M
H01M 2/16 (2006.01) C22C 38/00 (2006.01) C22C 38/06 (2006.01) C22C 38/50 (2006.01)
Patent
CA 2383808
Provided is a steel for separators of solid- oxide type fuel cells, which forms oxide films having good electrical conductivity at 700 to 950°C or so, has good oxidation resistance and, in particular, resistance to exfoliation even in the case of long hours of use, is excellent in impact properties at room temperature, shows a small difference in thermal expansion from the electrolyte, and is inexpensive. This steel for separators of solid-oxide fuel cells includes, by mass %, not more than 0.2% C, not more than 1.0% Si, not more than 1.0 % Mn, not more than 2% Ni, 15 to 30% Cr, not more than 1% Al, one or more elements selected from the group of not more than 0.5% Y, not more than 0.2% REM and not more than 1% Zr, and the balance of Fe and unavoidable impurities. In this steel, amounts of S, O, N and B in the unavoidable impurities are restricted to not more than 0.015%, not more than 0.010%, not more than 0.050% and not more than 0.0050%, respectively, the following equation is satisfied: (0+2S)/(0.27Y+0.035Zr+0.16REM)<= 2.0, Furthermore, in this steel, the hardness is not more than 280 HV and the average ferrite grain size number is not less than ASTM No. 2, which provides fine grains.
Ohno Takehiro
Toji Akihiro
Uehara Toshihiro
Gowling Lafleur Henderson Llp
Hitachi Metals Ltd.
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