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Modified stainless steel 316LN (SS316LN) is designed as ITER TF jacket materials for the application at 4K. The mechanical properties of modified SS316LN have been measured at both room temperature and 4K in order to evaluate its suitability as the candidate materials for ITER TF jacket. The effects of cold work and aging heat treatments have also been studied using two different modified SS316LN steels. It is found that both base and weld materials of the modified SS316LN after cold work and aging satisfy the designed requirement of mechanical properties for ITER TF jacket. [ABSTRACT FROM AUTHOR]