Elven steel is an alloy made in the Elven forge. It is made by alloying iron ingots/ore with coal/charcoal.
Upon smelting Elven steel, the player earns the achievement "Elven Smith".
It is used to make and repair Lindon, Galadhrim, Dorwinion, Rivendell and Wood-elven equipment, armour, steel bars, and chandeliers. It can also be used to repair Gondolinian swords and armour. Additionally, you can use them to repair Ringil and Glamdring.
Like other metals and crystals, Elven steel can be stored in a block by putting nine Elven steel ingots in the vanilla crafting table.