New alumina forming steels for future energy production with focus on high efficiency CSP´s

Research Project, 2014 – 2016

Objective and GoalThe technical/scientifical goal is to design a low temperature (LT)- FeCrAl alloy with excellent oxidation properties and ductility in the critical temperature range of 4-500°C.The ultimate project goal could be summarised by development of new ductile FeCrAl-alloys with superior oxidation/corrosion resistance in molten salt, liquid metal and steam in the temperature range of 300-750°C for future energy production with focus on CSP (concentrated solar power).Result and Expected EffectsDevelopment of a decision basis for production of a ductile Al2O3-forming steel for the temp range of 300-750°C. This steel is expected to have at least 10-times better oxidation resistance in in molten salt, liquid metal and steam compared to the stainless steels used today. An initial LT-FeCrAl steel export as tubes of around 10 kton per year is realistic only considering CSP´s, but the demands could be much larger within the area of increasing efficiencies in several energy processes.Approach and ImplementationA set of experimental alloys will be designed based on thermodynamic modelling and results from earlier projects, this will be performed by all project partners. The industrial partners will produce the alloys. Exposures the different environments will be performed by KTH and Chalmers. A more optimised set of experimental alloys, based on the evaluation of the exposures will be designed/produced and exposed again. The final evaluation will represent a decision basis for industrial production.

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