The Swede pushed himself ahead in the lead before the last lap and could then hold off and win at 45.92 without being threatened.
Bengtström was the fastest of all in the two semifinals.
- It feels very good and I went out offensively, says Bengtström who was disturbed by a cold but feels that the body responds well.
He was one hundredth from his personal record set earlier this winter.
- There are great opportunities to run on pers tomorrow.
I have topped the form well and then it does not do much with many races in a short time, says Bengtström after today's second race.
He also won his trial heat at lunchtime at 46.45.
Now there will be a long rest before Saturday's final at 20.15.
The success of the skating virtuoso Nils van der Poel has also served as inspiration.
- I have listened to Nils van der Poel.
He talks about high lactate values and I know how it feels, Bengtström explains.