[1] For surface running, the boats were powered by two 700-brake-horsepower (522 kW) diesel engines, each driving one propeller shaft.

The light anti-aircraft armament varied and could consist of one or two 20-millimeter (0.79 in) or one or two pairs of 13.2 mm (0.52 in) machine guns.

She had one success, when she sank the British armed trawler Tervani on 7 February 1943 off the Algerian coast.

Her last patrol was on 10 July from La Maddalena to act against Allied forces involved in Operation Husky, the invasion of Sicily.

On 13 July 1943, Acciaio was sunk by the British submarine Unruly with the loss of her entire crew of 46.