this citation summarizes a one-page announcement of technology available for utilization. design criteria and evaluation methods have been identified for austenitic alloys needed for steam service at 650 c and 35 mpa. the design criteria fall into five categories: metallurgical stability, fabrication and joining, mechanical properties, fireside corrosion resistance, and steamside corrosion resistance. alloys that have potential for meeting the design criteria have been identified in each category, and methods have been outlined for evaluating commercial and developmental alloys against the criteria. alloys that fall into the austenite phase field at 650 c are potentially the most stable, and the lean stainless steels typified by 17-14 cu/mo stainless steel appear to have adequate strength and fabricability. such steels need to be protected from corrosive media by cladding or surface treating. research has begun in an effort to improve the corrosion resistance of tubing fabricated from lean stainless steels and to improve the strength of high-chromium alloys. when the evaluation is completed in 1990, a basis will be provided for the selection of the best alloy for subsequent commercialization