Bright
Bright turns up in 2 fields: corrosion, heat treating. Here is what it means to the people in each one.
Bright in corrosion
Describing a metal surface that is completely bare, clean, and free of any protective coating, oxide, or mill scale.
A state of metal where surface preparation has removed all rust, scale, and previous coatings, exposing the raw, shiny base material. In this condition, the metal is highly reactive and vulnerable to immediate flash rusting if exposed to moisture or high humidity. It requires rapid application of a primer or protective layer.
"We blasted the spool piece to a bright finish, so get the primer on it before the humidity spikes."
Bright in heat treating
Describes parts that come out of the furnace clean and unoxidized, with no scale or discoloration.
Floor word for work that keeps a shiny, as-machined finish through heat treating, achieved in vacuum, dry hydrogen, dissociated ammonia or well-controlled nitrogen-based atmospheres with very low dew points. Bright annealing and bright hardening let parts skip blasting or pickling. Straw or blue tint on parts that should be bright means oxygen or moisture is getting into the furnace.
"Stainless tubes have to come out bright, if they're straw colored the hydrogen's wet."