description

Acicular sphero rolls are produced from high alloy spheroidal graphite cast iron material. 

After casting, these rolls are treated through a long-time, low-temperature annealing process which is primarily applied for the purpose of relieving the internal stresses, as well as to ensure the complete transformation of possibly retained austenitic phase in the microstructure.

This microstructure named as acicular structure is obtained through formation of bainitic and needle structured martensitic carbides. 

  • Cr, Ni, Mo alloyed spheroidal cast iron
  • Bainite + Martensite +Carbide + Spherolite
  • Hardness drop
  • Tensile strangth: 500 – 700 N/mm2, Bending strength: 700 – 950 N/mm2
  • On finishing stands for small rounds
  • Resistance to wear
  • Sensitive to firecracks, attention to cooling

hardness profile

microstructure

chemical analysis & hardness

HARDNESS 
(SHORE C)
CHEMICAL ANALYSIS
C% Si% Mn% Cr% Ni% Mo%
72-77 3.2 - 3.7 1.0 - 1.6 0.3 - 0.8 0.3 - 0.8 3.5 - 4.5 0.5 - 1.0

© Silvan Sanayi A.Ş.