While the Skyforge allows Eorland to craft Skyforge Steel weapons, which have the same design as regular Steel weapons but have the same base damage as Elven weapons, you can't forge this particular weapon variety yourself. Located in Whiterun behind Jorvaskyrr, the Skyforge, run by Eorland Greymane, is one of two forges in the city, with the other, Warmaiden's, under the ownership of Adrianne Avenicci.