Thermal Conductivity and Electrical Resistivity Standard Reference Materials: Austenitic Stainless Steel, Srm's 735 and 798, from 4 to 1200 K

Thermal Conductivity And Electrical Resistivity Standard Reference Materials: Austenitic Stainless Steel, SRM’s 735 and 798, from 4 to 1200 K by Jerome G. Hust and P. J. Giarratano. This publication provides a historical overview of the development of thermophysical Standard Reference Materials (SRMs), focusing on SRMs 735 (thermal conductivity) and 798 (electrical resistivity) for austenitic stainless steel over 4 to 1200 K. It outlines selection criteria for SRMs, summarizes the measurement program conducted by NBS and AGARD, and presents best-value data with assessed uncertainties, including material variability and temperature dependence. The report discusses low-temperature measurements down to 4 K and high-temperature data up to 1200 K, with uncertainties: about 1-2% for resistivity and a few percent for thermal conductivity, depending on temperature. The authors emphasize the importance of SRMs in achieving consistent, traceable measurements across laboratories, and note the materials' stability and lack of irreversible transformations within the tested range. The SRMs are offered in several rod sizes by the National Bureau of Standards.