Composite work roll for cold rolling

A cold rolling composite work roll with an outer layer formed around the perimeter of a core material, which is a cold rolling composite work roll characterized by having high abrasion resistance, wherein said outer layer comprises;

• C:
• 0.9-1.5 wt %,
• Si:
• 0.3-1.0 wt %,
• Mn:
• 0.3-1.0 wt %,
• Cr:
• 4.0-10.0 wt %
• Mo:
• 2.0-8.0 wt %,
• V:
• 0.5-5.0 wt %,
• and the remainder Fe and unavoidable impurities, is formed by a continuous pouring process for cladding around the perimeter of said core material which is made from cast steel or forged steel;
• said outer layer having a M6C-based network eutectic carbide, granular MC carbide, tempered martensite and retained austenite, and has a hardness of HS 90 or greater.

A cold rolling composite work roll with an outer layer formed around the perimeter of a core material, which is a cold rolling composite work roll characterized by having excellent spalling resistance,

• wherein said outer layer is formed around the perimeter of said core material by a continuous pouring process for cladding,
• said core material is a low alloy steel comprising at least 0.3-0.7 wt % C, 0.5-3.0 wt % Cr and 0.1-2.0 wt % Mo,
• said outer layer comprises;
• C:
• 0.9-1.5 wt %,
• Si:
• 0.3-1.0 wt %,
• Mn:
• 0.3-1.0 wt %,
• Cr:
• 4.0-10.0 wt %,
• Mo:
• 2.0-8.0 wt %,
• V:
• 0.5-5.0 wt %
• and the remainder Fe and unavoidable impurities,
• the surface portion of said outer layer has a compression residual stress of 60 kgf/mm2 or lower and a Shore hardness of HS 90 or greater,
• said outer layer having a M6C-based network eutectic carbide, granular MC carbide, tempered martensite and retained austenite.