Stabilimento Tecnico Triestino
Stabilimento Tecnico Triestino was a private shipbuilding company based in Trieste from the mid-19th to early 20th century, and the most important naval shipbuilding firm of the Austro-Hungarian Empire.
After World War I, Trieste was annexed by Italy and the firm built naval and commercial vessels for its new host country. STT was merged with another Italian shipbuilding firm, Cantiere Navale Triestino, in 1929 to form Cantieri Riuniti dell' Adriatico. As CRDA Trieste, its shipyards remained active well into the postwar period, becoming part of the Fincantieri group in 1984.
History
Austro-Hungarian ownership
Stabilimento Tecnico Triestino had its origins in a private shipyard founded by Giuseppe Tonello at San Marco, on the coastline west of Trieste, in 1838. In 1857, the shipyard was merged with a local manufacturer of marine engines to become STT. A second shipyard was also acquired, at San Rocco near the town of Muggia just south of Trieste.STT was the largest and most important shipbuilder in the Austrian Empire and its successor state, the Austro-Hungarian Empire. The company built most of the Austro-Hungarian Navy's capital ships, as well as many merchant vessels. In the 1860s and 1870s, STT built five of the Austro-Hungarian Navy's seven centre-battery ships, as well as a number of ironclads, cruisers, frigates and corvettes. Between 1884 and 1914, the company built 13 of the Austro-Hungarian Navy's 16 battleships, including all three battleships of the, all three of the, and three of the four. It also built the three coastal defence battleships of the.
In 1909 Rudolf Montecuccoli, chief of the Austro-Hungarian Navy, pressured STT to start work on two dreadnoughts, and, even though approval of the budget for them was held up in the Austro-Hungarian Reichstag – being concerned about Italy and France embarking on dreadnought projects of their own. Montecuccoli was compelled to resort to an intricate web of propaganda and deception to camouflage the fact that the new ships did not have Reichstag approval. He asserted that industry was financing the construction of two dreadnoughts on speculation; this was completely untrue, and both STT and Skoda were extremely nervous about the subterfuge. In the event, the two ships could not be laid down until after Montecuccoli took an expensive 32 million crown credit in 1910 upon his own responsibility. The parliamentary approval was only granted in March 1911, when the dreadnoughts were already under construction. STT then also got the contract for the.
By 1914, the San Rocco shipyard had five slipways of between 350 and 500 feet as well as a 350-foot dry dock and a 400-foot floating dock. The company had its own plant in Muggia for the manufacturer of engines and boilers, and a licence from the United Kingdom to produce Parsons steam turbines. In the years prior to World War I, the company's workforce had been gradually expanded from 2,700 to approximately 3,200.
Following Italy's entry into World War I against the Central Powers, STT was stripped of its Italian name and given the patriotic German name Austriawerft. Austriawerft was contracted to build two new battleships during the war, but these were cancelled in 1915, probably due to the company's loss of skilled workers, most of whom were Italian. Two submarines contracted to the company later in the war also had to be cancelled due to the lack of experienced submarine technicians.
Italian ownership
After the Austro-Hungarian Empire broke up at the close of World War I, the region of Trieste was ceded to Italy and Austriawerft became an Italian firm, whereupon its original name, Stabilimento Tecnico Triestino, was restored. During the 1920s, STT built the heavy cruiser for the Italian navy, and the luxury commercial liner.In 1929, STT merged with another Italian company, Cantieri Navale Triestino based at Monfalcone, to form Cantieri Riuniti dell' Adriatico , and the STT component was named CRDA Trieste. CRDA Trieste built a number of light and heavy cruisers for the Regia Marina Italia between the wars, as well as some 27 submarines. The ocean liner was also constructed there in 1932.
During the Second World War, CRDA Trieste built two battleships for the Regia Marina, and. CRDA Trieste survived the postwar shakeup in the shipbuilding industry and went on to build several more commercial liners in the 1950s and 1960s, as well as a few naval vessels. In 1984, CRDA was sold to the Fincantieri Group, and its Trieste shipyards were no longer considered important ship construction or repair facilities. However, as of 2000, the shipyards still retained three dry docks capable of serving ships up to 25,000, 35,000 and 170,000 tons respectively.
Production
STT (Austria-Hungary)
The following table lists the capital ships built for the Austro-Hungarian Navy. An asterisk denotes a unique ship.| Ship | Type | Class | Built | Disp. | Notes |
| Ironclad | Erzherzog Ferdinand Max | 1866 | N/A | Scrapped 1917 | |
| Ironclad | Erzherzog Ferdinand Max | 1866 | N/A | Scrapped 1900 | |
| Ironclad | * | 1869 | 2,000 | Built for Greek Navy, scrapped 1925 | |
| Zrinyi | Screw corvette | Zrinyi | 1871 | 1,450 | Scrapped after 1920 |
| Centre-battery | * | 1871 | 7,178 | Scrapped 1895 | |
| Radetzky | Screw frigate | Radetzky | 1873 | 4,000 | To Italy in 1919, scrapped 1921 |
| Centre-battery | * | 1874 | 6,500 | To Italy in 1920, scrapped 1955 | |
| Laudon | Screw frigate | Radetzky | 1875 | 4,000 | To SHS 1919, to Italy in 1921, scrapped 1924 |
| Centre-battery | * | 1875 | 7,700 | To Italy in 1919, scrapped after collision, 1925 | |
| Centre-battery | Kaiser Max | 1876 | 4,000 | Sunk, 1919 | |
| Centre-battery | Kaiser Max | 1878 | 4,000 | To Serbo-Croatia 1920, sunk as breakwater, 1945 | |
| Centre-battery | Tegetthoff | 1881 | 8,000 | To Italy in 1919, scrapped after 1921 | |
| Battleship | * | 1887 | 5,631 | To Italy in 1919, scrapped 1926 | |
| Torpedo cruiser | * | 1888 | 1,683 | To Italy in 1919, scrapped 1920 | |
| Torpedo/ram cruiser | Kaiser Franz Joseph I | 1890 | 4,500 | Capsized and sank, Oct 1919 | |
| Torpedo/ram cruiser | Kaiser Franz Joseph I | 1892 | 4,500 | Scuttled Nov 1914 at Tsingtao, China | |
| Armoured cruiser | * | 1895 | 6,000 | To United Kingdom in 1919, scrapped 1921 | |
| Coastal defence | 1898 | 5,878 | To United Kingdom in 1919, scrapped 1921 | ||
| Coastal defence | 1898 | 5,878 | Torpedoed 1916, salvaged 1925, fate unknown | ||
| Coastal defence | 1898 | 5,878 | To United Kingdom in 1919, scrapped 1921 | ||
| Armoured cruiser | * | 1900 | 7,000 | To United Kingdom in 1919, scrapped 1922 | |
| Battleship | 1902 | N/A | To United Kingdom in 1919, scrapped 1922 | ||
| Battleship | 1903 | N/A | To United Kingdom in 1919, scrapped 1922 | ||
| Battleship | 1904 | N/A | To United Kingdom in 1919, scrapped 1922 | ||
| Battleship | 1906 | 11,000 | To France in 1919, scrapped 1921 | ||
| Battleship | 1907 | 11,000 | To France in 1919, scrapped 1921 | ||
| Battleship | 1907 | 11,000 | To United Kingdom in 1919, scrapped 1921 | ||
| Battleship | 1908 | 15,000 | To Italy in 1918, scrapped 1922 | ||
| Battleship | 1911 | 16,000 | To South Slavic 1918, scrapped 1922 | ||
| Battleship | 1911 | 16,000 | To South Slavic 1918, scrapped 1922 | ||
| Battleship | 1913 | 21,000 | To South Slavic in 1918, to Italy in 1918, scrapped in 1924 | ||
| Battleship | 1912 | 21,000 | To South Slavic in 1918, scrapped 1920-1922 | ||
| Battleship | 1914 | 21,000 | To South Slavic in 1918, to Italy in 1919, to France in 1920, sunk as target 1922 | ||
| Battleship | N/A | 25,000 | Cancelled 1915 | ||
| Battleship | N/A | 25,000 | Cancelled 1915 |
References: Conways All the World's Fighting Ships, 1860–1905, Historical Handbook of World Navies website, Naval History Flixco website
STT (Italy)
The following table lists ships built by STT after the Italian takeover.| Ship | Type | Class | Built | Disp. | Notes |
| Trieste | Cruiser | Trento | 1926 | 13,545 | Sunk by bombing, 1943 |
| Ocean liner | N/A | 1928 | 25,661 | Scrapped 1961 |
Reference: Winklareth p. 292
CRDA Trieste
The following table lists ships built at the former STT shipyards after the company's 1929 merger with Cantieri Navale Triestino to form CRDA.| Ship | Type | Class | Built | Disp. | Notes |
| Various | Submarines | N/A | 1931–40 | N/A | 27 submarines |
| Cruiser | 1931 | 14,530 | Sunk 1941 | ||
| Light cruiser | 1931 | 7,113 | Scrapped, 1951 | ||
| Ocean liner | N/A | 1932 | 48,502 | Scuttled 1943 | |
| Light cruiser | 1935 | 8,994 | Sunk by bombing, 1942 | ||
| Light cruiser | 1937 | 11,735 | Converted to guided missile cruiser, 1957, scrapped 1972 | ||
| Battleship | 1940 | 45,752 | Scrapped 1946? | ||
| Battleship | 1942 | 45,752 | Sunk by bombing, 1943 | ||
| Donizetti | Ocean liner | N/A | 1951 | N/A | N/A |
| Rossini | Ocean liner | N/A | 1951 | N/A | N/A |
| Verdi | Ocean liner | N/A | 1951 | N/A | N/A |
| Ocean liner | N/A | 1952 | 27,090 | Still operating as restaurant ship, MS Philippines, in 1999 | |
| Ocean liner | N/A | 1965 | 45,933 | Sold to Iran and converted as floating barracks, 1977, sunk by bombing in 1983 |
Reference: Winklareth pp. 292–293