Find monsters that drop items in this list, and then kill them.
Or, just kill anything, anywhere, because iron is very common. Warrior mobs that drop armor drop more items salvageable to iron, simply because they drop the armors. Nearly all warrior weapons salvage to iron as well.
By doing Fronis Irontoe's Liar. There is a lot of armor dops and you just salvage them and get a lot of iron + if u come to the end of the dungeon you get the chest (alko).
swords and wand have a high yeild usually 40+ with highly salvagable inscript on. just doing the regular play gets me enough to salvage. Otherwise raptors do drop swords.