It was a big field to be 400 meters indoors.
For the lap, Bengström took the lead and had the other five runners behind him.
Only Dane Benjamin Lobo Vedel hung on during the second lap.
In the short race, Bengström managed to pull in from a few meters further and win safely.
The victory in the tough European competition was a step in the right direction for Bengtström ahead of the Indoor EC in Istanbul at the beginning of March.
Karsten Warholm tops the European list with 45.31.
Bengström is second in his 46.15.
Before today's time, Bengström had run 46.26 indoors in Växjö two weeks ago.