Our previous investigations had demonstrated the compatibility of elemental boron with iron, but the selection of austenitic stainless steel presented the question of the compatibility of the boron with the alloying elements at the elevated sintering and fabrication temperatures (1050 to 1150°C) normally used in manufacturing such absorbers. Austenitic stainless steel usually contains nickel to stabilize the austenite. However, the nickel-boron phase system has a eutectic of 990°C at 42 at.%B. Our preliminary tests with intimate coupling of 4.6 wt%B and type 304 stainless steel showed evidence of melting after 30 min at 1050°C. Rather than limiting the processing temperatures to below 990°C, we selected a type 200 stainless steel in which the austenite is stabilized with manganese. Nickel in this alloy is a residual "tramp" element. The type 200 stainless steel tested contained 20.70 wt%Mn, 16.37 wt%Cr, 0.49 wt%Ni, 0.03 wt%C, 0.06 wt%Si, 0.008wt%S, 0.009 wt%P, and the balance iron.