This is listed as Corten steel and signed "Serrano Fajardo." A quick search shows that corten steel is a kind of rusted building material, but the other name reveals nothing. Gorgeous and infinitely useable.
This piece shows pattern and texture because of the way the metal is weaved together. The metal also creates a pattern from light to dark in the weave, giving the piece visual appeal. The surface of this is most likely smooth as well.