An inexpensive metallic material for interconnects of solid-oxide fuel
cells, a fuel cell using the metallic material, and a method for
producing the metallic material having excellent oxidation resistance and
spalling resistance of an oxide layer, high electrical conductivity, and
a small difference in thermal expansion from an electrolyte.
Specifically, 0.20 percent by mass or less of C, 0.02 to 1.0 percent by
mass of Si, 2.0 percent by mass or less of Mn, 10 to 40 percent by mass
of Cr, 0.03 to 5.0 percent by mass of Mo, 0.1 to 3.0 percent by mass of
Nb, and at least one element selected from the group consisting of Sc, Y,
La, Ce, Pr, Nd, Pm, Sm, Zr, and Hf in a total of 1.0 percent by mass or
less are added so as to satisfy 0.1.ltoreq.Mo/Nb.ltoreq.30, for
decreasing the growth rate of the oxide layer and improving the spalling
resistance.