API TR 938-C: 2015 [paper]

API TR 938C – Use of Duplex Stainless Steels in the Oil Refining Industry, 3rd edition

Covers many of the “lean”, “standard”, “super”, and “hyper” grades of duplex stainless steels (DSSs) most commonly used within refineries. The definitions of these terms have not been firmly established by the industry, and vary between literature references and materials suppliers. Table 1 shows how the various grades are being classified into “families” for the purposes of this report.