The main objectives of the work presented in this report are to gain knowledge and collect characteristics for the application of duplex stainless steel (EN 1.4462) in economical pressure vessel design. The work covers ECOPRESS subtasks 4.3, 5.1, 5.4 and 6.2 and have included a total of 30 uniaxial tensile tests on base material, weld material and material from HAZ, redesign of an existing test set-up for membrane tests, a total of 12 membrane tests on plain and butt welded specimens and specimens with nozzles welded to them, 3 biaxial tests, design according to the Swedish Pressure vessel code of a typical pressure vessel in duplex stainless steel and a non-linear finite element analysis of the previously designed pressure vessel using material characteristics and other necessary inputs obtained from the evaluation of the uniaxial and membrane tests.