What is mill finish on metal?
Related Terms
Hot-Rolled Steel(HR)
Hot-rolled steel is produced by rolling steel at high temperature (above recrystallization point). It has a rough mill scale surface and looser tolerances than cold-rolled, but is less expensive and widely stocked.
HRPO Steel(HRPO)
HRPO stands for Hot-Rolled Pickled and Oiled. It is hot-rolled steel that has been acid-cleaned (pickled) to remove mill scale and coated with oil to prevent rust. Preferred for stamping and laser cutting.
Brushed Finish
A brushed finish is created by mechanically abrading the metal surface with a fine abrasive belt or pad, leaving fine parallel lines. Common on stainless steel appliances and architectural panels.
Pickling and Oiling(P&O)
Pickling removes mill scale from hot-rolled steel using acid, and oiling applies a thin protective oil coat to prevent rust. The result is HRPO steel — a cleaner surface for stamping and laser cutting.