The results of a metallurgical investigation which led to and supported the selection of Type-316 stainless steel (17 Cr-13 Ni-2.5 Mo) piping and a welding electrode of 16Cr-8 Ni-2 Mo composition for fabricating the main steam system of Eddystone No. 1 are presented. The investigation revealed the comparative properties of welds in several combinations of columbium and molybdenum-bearing austenitic stainless steels. A brief description of the major steps required to fabricate the heavy-wall stainless-steel piping is presented.

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