Here you have all metal bar locations in Google maps, hope this helps 🙂
I don’t know much this area but I’ve found a few interesting places. Please, leave a comment if your pub is in this district and I didn’t mention it.
Kalcos. Open till 3:00 am. Metro station Vista Alegre, line 5, green.
Hellraiser. Open till 3:30 am. Metro station Opañel, line 6, gray.
Gruta 77. Pub and Venue. Open till 4:00 am. Metro station Oporto, line 6 and 5, gray and green respectively.
Star. Open till 3:30 am. Metro station Opañel, line 6, gray
Julia Rock. Venue and pub. Open till 3:30 am (Thurst – Sat). Metro station Opañel (like the rest)
Entre darts Rock. Venue and pub. Open till 5:00 am saturday and sunday, the rest days at 2:00 am. Between Plaza Elíptica and Oporto metro stations.