Right. I know that Koton is the combination of Doton and Katon, much like a forge creates metal by superheating earth-borne ore. I also know that much like Doton and Katon, it is an element that uses the user's body as a primary medium for creating its techniques.
Furthermore, there are a few weaknesses and strengths to be noted surrounding Steel Release. The first is that it absolutely annihilates Water one-on-one as, much like earth, water struggles to put a dent in the sheer physical resistance that Steel sports. Furthermore, Earth techniques just aren't AS hard as steel, and tend to crumble when put to the test of a Steel Release attack. I.E, Steel Release has a one rank advantage over Earth and Water. However, on the opposite side, as Steel is a conductor and an earthen element, it is quickly dismantled by Lightning Release, which holds a one rank advantage over it.