Steel knives are rarely generated by Ava's accumulator.
To create steel knives, the player must have at least 37 Smithing. Each steel bar creates 5 steel knives, granting the player 37.5 Smithing experience. Martin Thwait at the Rogue's Den sells Steel knives for 68 coins each, but you may only buy 100 per day. They can sometimes be found inside barrels. Steel knives are also rarely generated by Ava's accumulator.
The Steel Knife (鋼のナイフ Hagane no naifu) is a C-rank Knife from Fire Emblem: Radiant Dawn. This knife, like its other brethren, is rather weak and fairly inaccurate, in addition to being low on uses. These flaws are, however, offset by the fact that it is a ranged weapon, alongside being extremely light.
To create steel throwing knives the player must have at least 37 Smithing. Each steel bar will create 5 steel throwing knives and the player will receive 37.5 Smithing experience. Steel knives can be bought from Martin Thwait's Lost and Found shop in the Rogues' Den. They are also rarely generated by Ava's accumulator.