Chapter 3 - Rolling of metals

Example for cold strip mill process. www.nzsteel.co.nz
20 tonne coils of cold rolled
steel are dispatched to
Metal Coating Line
In batches of 9 coils, cold
rolled steel is annealed to
reduce work hardening
The 6 roll configuration enables this
high speed mill to produce steel of
high quality with consistent shape
and flatness Cold rolling mill
Coils are transferred to
and from the annealing
furnace
Cold rolling reduces the thickness
and increases the strength of hot
rolled steel. The surface finish and
shape improve and work hardening
results
Coils up to 40 tones enter on a
conveyor from the pickle line
The combination mill has a dual
function, cold rolling and single pass
temper rolling
Temper rolling improves the shape
of the strip after its workability has
been improved by annealing
Cold rolled, annealed and
tempered coils are transferred
to the Cold Finishing Section
Suranaree University of Technology Tapany Udomphol
Jan-Mar 2007