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Aging embrittlement, normally observed in ferritic stainless steels, was found in a Fe-Cr-Ni duplex stainless steel thermally aged at 400°C for a long time. The ferrite content and composition of the duplex stainless steel was changed by varying the solution annealing temperature in order to investigate the effect of ferrite phase on the aging embrittlement. The material was aged at 400°C up to 10000...