Who plays the voice of Ginga from hagane?

You're likely thinking of the character Ginga Ikari from the anime series "Gundam SEED DESTINY".

The voice actor for Ginga Ikari is Kazuya Nakai. He's also known for voicing other popular anime characters like:

* Zoro Roronoa in "One Piece"

* Rokuro Okajima in "Blue Exorcist"

* Gray Fullbuster in "Fairy Tail"

There isn't a character named Ginga in an anime series called "Hagane". Please clarify if you're thinking of a different anime, and I'll try my best to assist you!