This phase of the LLNL study of wastage of carbon steel evaporator tubing in fluidized-bed coal combustors (FBC) of the bubbling-bed type focused upon leads uncovered during the previous phase suggesting that trace-element residuals in the tubing steel influenced wastage response. Experimental steels of controlled compositions, but simulating commercial steelmaking practices, were prepared within several elements indicated to be important in these respects were varied independently. This initial series showed that additions of some of these elements, principally aluminum, nickel, and copper -- when present singly -- improved scale adhesion in room temperature bend tests. In a second series of experimental steels, aluminum additions significantly decreased elevated temperature indentation hardness, even with co-present residuals of chromium, nickel, and copper. Steels of the same series having combined residuals of aluminum, chromium, nickel, and copper had improved resistance to scale exfoliation in room temperature bend tests over steels without these trace-elements.