Steel is a Runeword "TirEl" in Diablo 2 Resurrected (D2R). It requires these 2 runes to be inserted into a socketed item in the exact order: Tir + El . The eligible bases for Steel are the following: Swords, Axes, Maces . An important benefit coming from Steel:
  • Opening wounds will cause the enemies to bleed over time. This is helpful against the Diablo clone.
SteelSteelCrystal Sword
Tir · El
One-Hand Damage: 9 to 21
Durability: 20 of 20
Required Strength: 43
Required Level: 13
Increased Melee Range: 1
Base Attack Speed: 0
+20% Enhanced Damage
+3 to Minimum Damage
+3 to Maximum Damage
+50 to Attack Rating
+50% Chance of Open Wounds
+25% Increased Attack Speed
+2 to Mana after each Kill
+1 to Light Radius
Socketed (2)
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How to obtain Steel

The fastest way to get this item on Battle.net is via trading, you can use the Item Price Checker to see how much Steel is worth.
Another way of getting this Runeword is by farming the runes and the base. Find the drop rates of these items in the Item Database.

Steel bases

The best base for Steel is Crystal Sword. Below is a list of all eligible 2 socket bases for Steel.