SGI Bainitic Accicular Rolls
Spheroidal graphite cast iron (SGI Iron) or ductile iron is considered as one of the most versatile Roll materials now a days produced by a small proportion of magnesium added to the melt as nickel magnesium or alternative alloy or pure magnesium.
In S.G. Iron Rolls, the free carbon takes the shape of spheroids or nodules. Thereby eliminating the notch effect the flack graphite and improving upon the mechanical properties of cast iron.
In many cases SGI Rolls with an acicular matrix is preferred because of ISS wear resisting qualities. To this end the iron is allowed with nickel and molybdenum to permit formation of an acicular Structure in the as cast condition. These Rolls are most suitable for heavier sections where addes strength and depth of hardness are required. Sand- cast acicular SGI iron is employed for certain special purposes. The hardness range varies from 65 degree share D to 75 Degree share D.
Application
There are specifically good for small section and flat rolling. However are also good for Roughing, intermediate, finishing and structural Mills and finishing for wire Red narrow Strip Mills.
