For more information check SARJIT ROLLS
Characteristics
|
Spun cast Rolls
|
Static cast Rolls
|
Structure
|
Bainitic
to martensic, highly recommended for finishing and continuous stands
|
Pearlitic
to bainitic recommended for roughing and intermediate stands
|
Standardization
|
Easily
available as all parameters can be controlled
|
Difficult
as most of the parameters cannot be controlled
|
Hardness
|
Uniformity
in hardness with depth i.e. due to centrifugal process
|
Hardness
reduces drastically with depth i.e. characteristic of a pearlite structure
|
Pass life
|
Ideally
20% higher performance to that of its static counterpart
|
|
Machinability
|
Easy
as there is an accurate distinction between shell and core and no hard
journals
|
Easy to medium, sometimes could lead to very
hard journals due to presence of excessive alloys
|
Chill depth
maintenance
|
Accurately
maintainable
|
Hard
to standardize, Varies with changes in pouring temperature and viscosity of
the metal
|
Shrinkage in
journals
|
Controllable,
as softer core metal has less shrinkage possibilities
|
Shrinkage
in journals is an issue due presence of hard alloy metal in journal
|
Impurities and blow
holes on the surface
|
Property
of centrifugal casting to reject all impurities and blow holes to the surface
which are removed during machining
|
Possibility
of blow holes and impurities on the shell surface
|
Strength of barrel
and journals
|
Fine
grain structure, prone to chipping and spalling in case no proper bonding
|
Equi-axed
structure, high in strength due to slow cooling, recommended for high
pressures of the roughing stands
|
