| 简介 |
PROBLEM TO BE SOLVED : To provide an oxidation resistant steel which forms oxide films having good electrical conductivity at 700 to 950°C or so, has good oxidation resistance and 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 an electrolyte, and is inexpensive, and to provide a component for a solid-oxide type fuel cell.
SOLUTION : This oxidation resistant steel other than steels for separators of solid-oxide type fuel cells includes, by mass%, ≤0.2% C, ≤1.0% Si, ≤1.0% Mn, ≤2% Ni, 15 to 30% Cr, ≤1% Al, one or more kinds selected from the group consisting of (≤0.5% Y, ≤0.2% rare earth elements and ≤1% Zr), and the balance substantially Fe with inevitable impurities consisting of ≤0.015% S, ≤0.010% O, ≤0.050% N and ≤0.0030% B, and also satisfies equation (1). The oxidation resistant steel has the hardness of ≤280 HV, and is composed of fine grains satisfying the average ferrite grain size number of ASTM No.2 or above.
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