English
| U-231 | Type VIIC |
| Feldpost Number | M 50 310 |
| Construction Yard | F.Krupp Germaniawerft AG, Kiel-Gaarden |
| Yard Number | 661 |
| Ordered | 7th Dec 1940 |
| Keel laid | 30th Jan 1942 |
| Launched | 1st Oct 1942 |
| Commissioned | 14th Nov 1942 |
| Baubelehrung | 1.KLA, Kiel |
| Training, Flotillas and Duties | |
| 11.42 – 04.43 | 5.U-Flottille, Kiel Ausbildungsboot (under training) |
| 05.43 – 01.44 | 3.U-Flottille, La Pallice Frontboot (operational) |
| Commanders | |
| 11.42 – 01.44 | KL Wolfgang Wenzel |
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