Acciaio-class submarine

Italian Acciaio-class submarine (Porfido)
Class overview
Name	Acciaio class
Builders	Odero Terni Orlando (OTO), Muggiano Cantieri Riuniti dell' Adriatico (CRDA), Monfalcone Tosi, Taranto[1][2]
Operators	Regia Marina
Preceded by	Adua class
Succeeded by	end of 600 series
In commission	1941–1966
Completed	13
Lost	8
General characteristics [1][2]
Type	Submarine
Displacement	697 long tons (708 t) surfaced 850 long tons (864 t) submerged
Length	60.18 m (197 ft 5 in)
Beam	6.44 m (21 ft 2 in)
Draught	4.78 m (15 ft 8 in)
Propulsion	2 diesel engines, 1,400 hp (1,000 kW) 2 electric motors, 800 bhp (600 kW)
Speed	14 knots (26 km/h; 16 mph) surfaced 7.7 knots (14.3 km/h; 8.9 mph) submerged
Range	3,180 nmi (5,890 km) at 10.5 kn (19.4 km/h) surfaced
Test depth	80 m (260 ft)
Complement	45
Armament	1 × 100 mm (4 in) / 47 caliber deck gun 1-2 × 20mm/70 AA 6 × 533 mm (21 in) torpedo tubes (4 forward, 2 aft) 12 × torpedoes

The Acciaio-class submarine^[1][2] (also sometimes called Platino class^[3]) was the fifth subclass of the 600 Series of coastal submarines built by the Regia Marina. They were completed during the early 1940s and saw service in World War II.