Steel

Steel is an alloy of iron and carbon, and sometimes other elements. Because of its high tensile strength and low cost, it is a major component used in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons. Iron is the base metal of steel.

Oz's Steel
Not much is nown about this variation other than the fact it was used to create The Inner Key Of Oz, if broken, the key could only be repaired again in Oz.

Appearences

 * Season 2
 * Folsom Prison Blues
 * Season 4
 * Criss Angel Is A Douchebag
 * Season 5
 * The French Mistake
 * Two Minutes to Midnight
 * Season 6
 * Appointment In Samarra
 * Season 7
 * Meet the New Boss
 * Season 9
 * Bloodlines
 * Season 10
 * Reichenbach
 * Ask Jeeves
 * There's No Place Like Home
 * Season 11
 * Don't Call Me Shurley
 * Season 13
 * Exodus
 * Supernatural: Rite of Passage
 * Season 14
 * Lebanon

Trivia

 * Steel = Gold