Abstract
This paper shows results of fatigue properties and design fatigue curves of dual phase stainless steels. The dual phase stainless steels are often used in chemical plants because of advantageous properties of corrosion resistance for seawater, weldability and workability. To take advantage of plant design at low cost, the design fatigue curves are required. However, fatigue data of the dual phase stainless steels are not so many. Results of fatigue properties and design fatigue curves of the dual phase stainless steels (SUS329J4L and DP-3) by testing at room temperature are shown. In ultra high cycle region, the fish-eye type interior fracture is found. The design fatigue curves are constructed in accordance with ASME (Section VIII Division 2).
