Fe Base ODS alloys with improved mechanical strength

Developments in higher temperature exchangers and other applications, require high strength as well as oxidation resistance at very high temperatures. In order to meet such requirements, Dour Metal has developed the ODM a new range of oxide dispersion strengthened (ODS) iron based materials. Compositional and thermomechanical manipulations can be used to develop the structure enabling the service temperature to be increased up to about 1200°C. Typical rupture strengths are presented for temperatures ranging from 900 to 1100°C. Data on oxidation and corrosion properties of various compositions are also presented. The emphasis is given to alloy ODM 751 on which most recent work has been performed. The composition of the alloy is 16.5% Cr‐4.5% Al‐0.6% Ti‐1.5% Mo‐0.5% Y2O3‐bal Fe and provides the best compromise between strength, formability and oxidation resistance. Measurements of longitudinal creep at 1100°C to 1200°C on ODM 751 tubes show the outstanding properties of the alloy in this range of temperatures.