Looks like it could be Kona. I didn't see any glaring anomolies to say it isn't but your pictures don't show all details. I reckon it could be a 1993 frame because:
i) Up to 1992 the rear seat stay rack mounts were completely different on steel Konas so it's at least 1993.
ii) From 1994 onward the rack mount on the rear drop out was further to the rear as far i can tell - certainly on the lower-end steel Konas.
Your frame has similarities to the below pictures of two other 1993 Kona frames which i found on the internet, such as location of rack mounts, routing of cables, flaring of seat tube at the bottom bracket. So it might be a 1993 Kileauea or Explosif. A close up photo of your rear dropouts would help a lot.
Hmm but having written all that i just noticed your fluted down tube comment so that changes things a bit. Don't know which model had that.
Above info from 15mins internet research so open to debate!