OPTIMA® is a Centrifugal Cast Double Poured (CC Duplex) Nodular (Spheroidal) Iron having a Bainitic/ Martensitic microstructure. Centrifugal Casting allows for complex alloying of Cr-Ni-Mo used in the working layer (shell) when compared to a static cast roll. This casting process combined with complex alloying structure provides high hardness with improved wear resistance while maintaining a stronger core for neck loads. 

GRADE OPTIMA® I OPTIMA® II OPTIMA® III

 

C:  3 - 3.5%

Ni:  1.5 - 4%

Cr + Mo:  < 3% 

Roughing, Intermediate and
Finishing Stands of Rod
and Bar, Light and
Medium Section Mills,
Universal Stands for
Structural Mills,
Narrow Strip Mills
and Seamless Tube Mills
Intermediate and Finishing
Stands of Rod and Bar,
Light and Medium
Section Mills, Universal Stands
for Structural Mills, Narrow
Strip Mills and Seamless
Tube Mills
Intermediate and Finishing
Stands of Rod and Bar, Light
Section Mills, Merchant
Mills, Narrow Strip Mills and
Seamless Tube Mills
HSc 60-70 65-75 65-80
Tensile Strength MPa 400-600 500-700 200-400
Bending Strength MPa 800-1000 800-1000 300-400
Modulus of Elasticity GPa 160-180 160-180 110-140
Microstructure

The hardness adjustment is obtained during a complex heat treatment process. For production, we need a range of 5 ShC which needs to be specified in the roll order.

Our technical team can help to determine the most suitable grade, degree of hardness and manufacturing method to meet with individual mill conditions and specifications.