This WRC Bulletin records the data used to gain approval of ASME and API for application of the 347AP (347LN) alloy at elevated temperatures. All data and property equations are provided herein in both US Customary and Metric units. Included in the data collections and curve fits are yield and tensile strengths, Larson-Miller stress-rupture equations and the Omega Coefficients and corresponding strain rates based on creep curves for the stresses and temperatures for which data were provided.