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;
Operators	Regia Marina
Preceded by	Adua class
Succeeded by	end of 600 series
In commission	1941–1966
Completed	13
Lost	8
General characteristics
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 (also sometimes called Platino class) 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.

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