Siemens VAI direct-rolling, annealing and pickling lines
combine the traditionally separate processes of rolling,
annealing and pickling, skin passing, and leveling into
one integrated processing line.
A key element of the integrated process is the
in-line rolling mill. The Siemens VAI solution
developed for this application includes a number
of unique features.
Due to the high work-hardening characteristics of
stainless steel, small work rolls are required to
achieve the necessary reduction.
The Power X-hi technology uses additional lateral
support rolls to ensure stable and controllable rolling.
Lateral shifting of intermediate rolls and positive
and negative bending of the intermediate rolls
allows for shape actuation.
Strip surface quality is an essential property of
stainless flat products. Strip, strip cleanliness
prior to the annealing furnace is therefore essential.
Siemens VAI has designed an in-line de-greasing
section that ensures the highest product quality.
The work-hardened strip requires annealing and surface scale removal. This is achieved with a tunnel furnace and acid pickling section. For hot band, Siemens VAI also provides shot blast and scale breaker equipment between the furnace and pickle section to help with oxide removal.
Siemens Metals Technologies
Stainless Line