The Kriegsmarine ordered the completion of K1, K2 and K3, then commissioned them for service in Norwegian and German home waters.

After the war only K3 entered Dutch service as the Van Speijk.

K2 was found in Horten in 1945 and towed back to the Delfzijl where she sank by accident in November of that year.

The ship was raised the next year on 26 July and towed to Den Helder where she was sold for scrap in October 1947 after inspection.

After the war only K3 entered Dutch service as the Van Speijk after she was repaired at the Rijkswerf at Amsterdam.