The SB-2 was used by Bulgaria, China (~200), Czechoslovakia (53), Finland, Germany, the Soviet Union, and Spain (~200 / 210).
The SB-2 entered service in early 1936 / February 1936. The SB-2bis entered service in 1939.
From 1944-1945 the SB-2s were used as night fighters.
Payload to Height Record
In 1937 the SB-2 set a payload to height record of 2,205 lb / 1,000 kg to 40,177' / 12,246 m.
Spanish Civil War
The SB-2s were successful in the Spanish Civil War as they could typically out fly the Nationalist fighters. The Republican forces nicknamed them "Katyusha."
Chinese Air Force
The Chinese used SB-2s against the Japanese during 1938 - 1939. Most were lost during the second Sino-Japanese conflict.
Winter War Against Finland
From 1939-1940 SB-2s were used against Finland during the Winter War. The harsh weather conditions caused many breakdowns of the liquid cooled engeines.
Great Patriotic War
By the time Germany invaded in June 1941 the SB-2 was obsolete but it was still used as a night bomber.
Starting in 1943 most were used as trainers or target tugs.