... Genter porosity≤3 Segregation≤3 Hot-rolling roller and roller blank 400-850mm 45Cr,55Cr,42CrMo,50CrMo, 60CrMo,60CrNiMo,H13,0CrMnMo ... δ5≥20% ψ≥50% a k≥150J/cm2Our Roller and Roller Blank are of good quality and in reasonable price. Roller and ...