English
| U-431 | Type VIIC |
| Feldpost Number | M 40 228 |
| Construction Yard | F.Schichau GmbH, Danzig |
| Yard Number | 1472 |
| Ordered | 23rd Sep 1939 |
| Keel laid | 4th Jan 1940 |
| Launched | 2nd Feb 1941 |
| Commissioned | 5th Apr 1941 |
| Baubelehrung | 7.KLA, Danzig-Neufahrwasser |
| Training, Flotillas and Duties | |
| 04.41 – 12.41 | 3.U-Flottille, Kiel & St.Nazaire Ausbildungsboot (under training) Frontboot (operational) |
| 01.42 – 10.43 | 29.U-Flottille, La Spezia & Toulon Frontboot (operational) |
| Commanders | |
| 05.04.41 – 31.12.42 | KL Wilhelm Rudolf Dommes see also: U-178 |
| 01.01.43 – 21.10.43 | OL Dietrich Adalbert Schöneboom see also: U-58 |
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