Patent ID: 8684895

Claim:
A roller body for a roller for treating a material, wherein the roller body is cast from an iron base alloy which forms a radially interior zone of the roller body made of grey cast iron and, around the interior zone, a circumferential rim zone which includes the outer circumference of the roller body and has a surface hardness which is greater than 400 HV, wherein the circumferential rim zone comprises ribbon grain or superfine ribbon grain pearlite with embedded free graphite, wherein the embedded free graphite is at least substantially spheroidal graphite and graphite pebbles of said spheroidal graphite in the solidified circumferential rim zone exhibit a size which corresponds to an index value of at least 5 and at most 7 in accordance with EN ISO 945, and wherein pearlite content is greater than 90% in the circumferential rim zone.