Black Annealed Properties:
Cold Rolled Black Annealed (CRBA), also known as "Blue
Steel". CRBA is a cold rolled sheets that have been
oxidized by annealing in a special installation in order to
produce a very thin magnetite layer (Fe304) on the surface
(less than 1 μm thick) for more protection.
Cold Rolled Black Annealed provide protection
against corrosion for the parts whose surface is not
protected by normal painting or any metallic coating
processes. The magnetite layer can withstand
moderate bending and drawing operations.
The sheet surface is very clean and retains its
attractive appearance during storage.
According EN 10130 & EN 10131 and As per
• All kinds of Steel pipes and tubes (Stove pipes).
• Lining of industrial bread ovens.
• Furniture & construction.
• General Steel usage where there is no need for further
painting is required.
Recommendations for use:
The processing conditions for Cold Rolled Black
Annealed are similar to those for cold forming.
Corrosion resistance (salt spray test):
Corrosion resistance is greater than that of
uncoated cold rolled steel by around 6 times extra
1 x CR : 6 x BS : 70 x GI
Could performing electroplating after scale layer
removal through acidic solution process.
Cold Rolled Black Annealed is a moderate
performance of direct surface painting. It is being coated
either by normal
or electrostatic process.
Cold Rolled Black Annealed can be supplied with or
without oil film.