Kelly Gilliam, Dovetail's architectural metal manager, recently held a metal blackening workshop for several architecture firms we work with, as well as Dovetail employees. A good crowd turned out to learn about the complex qualities of steel.
Above, Kelly is neutralizing the blackening solution on 11 gauge hot rolled steel.
Here we see the difference between hot rolled pickled and oiled (P&O) steel that has been orbital sanded (DA'ed out) to 180 (left), compared to a hot rolled blackened sheet with the raw mill finish (right).
Comparing the miter joints on handrail material after blackening hot rolled flat bar steel (left) in contrast with cold rolled flat bar steel (right).
Beautiful results: hot rolled, blackened, and oiled steel. The topographical-like features are a natural byproduct of the extrusion process. You can never predict the surface quality of each sheet from the manufacturer, but Kelly prefers hot rolled steel sheets with unique qualities and character.
Stay tuned for another metal shop workshop!