Momentum expansion of massive two-loop Feynman graphs around a finite value

We give an algorithm for obtaining expansions of massive two-loop Feynman g raphs in powers of the external momentum around a finite, nonzero value of the momentum. Such momentum derivatives are encountered while evaluating ph ysical radiative corrections, such as in wave function renormalization cons tants. This is based on our general two-loop formalism to reduce massive tw o-loop graphs with renormalizable interactions into a standard set of speci al functions. After the algebraic reduction, the final results are obtained by numerical integration. We apply the expansion algorithm to treat the to p dependent corrections of O(g(2)alpha(s)) to the b-quark self-energy and e xtract its momentum expansion on-shell.