This WRC Bulletin records the data used to gain approval of ASME and API for application of the 317AP (UNS S31740) alloy at elevated temperatures, and recognition of this alloy in API Std 530 and API 579-1/ASME FFS-1. 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, material physical properties, aged Charpy impact values, Larson-Miller stress-rupture properties, and MPC Omega Method properties, including Omega parameter and initial creep strain rate coefficients corresponding to the stresses and temperatures for which data were provided. Also contained within this Bulletin are available data for both plate and tube welded joints, intended to demonstrate the suitability of welded constructions of 317AP for elevated temperature service. At the publication of this Bulletin, only elevated temperature tensile and aging impact energy data for welded joints are available – no weldment creep data are currently available. Therefore, this Bulletin uses conservative assumptions to recommended modifications to the base metal properties to account for the behavior of welded joints, until such data can be collected.