The progress achieved since 1977 in the important area of materials and processes development of fast reactor steam generator development is summarized. The two distinguishing features of the proposed Westinghouse-Tampa steam generator concept are the convoluted shell expansion joint (CSEJ) and the double-wall tubing with a third fluid leak detection capability. A Cr—1 Mo low alloy steel will be used for all important parts of the generator including the CSEJ and the tubes. Other areas in which progress was made include tube-to-tubesheet (TITS) welding, post-weld heat treatment (PWHT), tube expansion, and development of materials specifications for prototype and future plant materials. The tubing development work was based on the successful completion of a manufacturing feasibility program in 1974. This activity has involved manufacture of 23.47-m (77-ft)-long pre-stressed double-wall tubing (DWT) and testing of the tubing for dimensional tolerance or control interface residual stress, heat transfer, interface wear, and gas flow rates at the DWT interface. Results illustrate the capabilities of the vendors’ tube manufacturing process in achieving the important attributes of a leak detecting, prestressed, double-wall steam generator concept. The CSEJ material selection and design have evolved significantly since 1977. A materials change from Alloy 600 to Cr—1 Mo was recently made. The approach to manufacturing the CSEJ is to machine the convolutes from a large pre-forged ring of remelt Cr—1 Mo steel. Significant welding and PWHT process development progress has been achieved for both accessible and inaccessible T/TS welds. Equipment has been designed and manufactured successfully, and welding parameter development is well under way. Automatic and manual welding guns utilizing the pulsed current technique are described. The approach to PWHT involves induction heating for short times at a relatively high tempering temperature. Temperature control of the induction unit involves a preprogrammed heating cycle and feedback control using infrared sensors or thermocouples.