Friction stir processing of dual certified 304/304L austenitic stainless steel for improved cavitation erosion resistance

•Friction stir processing was performed on dual certified 304/304L plates.•Temperature control was applied during processing.•Microstructure and hardness of the processed and the base metal were evaluated.•Cavitation testing was done according to ASTM G134.•Friction stir processing improved materials' cavitation erosion resistance.