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PF 105

High Cr duplex rolls use the high alloy cast steel (or iron) with up to 6-22% Cr content as the shell's material, and use high strength nodular iron as the core material.

According to the content of carbon, it can be divided into high Cr cast steel rolls and high Cr cast iron rolls. Influenced by the high Cr content, its carbide is M 7 C 3 which has higher hardness, better toughness and extremely good wear resistance than normal carbide. With the high alloy elements and special heat treatment, the matrix has the excellent comprehensive properties at high temperature.

According to the stand used and cooling water in the hot strip mills, high Cr cast steel or high cast iron can be selected. These rolls can be used as the working rolls in the cold mills and tempering mills, and the rings can also be made of these material..

Microstructure:

	Example Of typical Hardness Profile.
Chemical composition(%) Symbol C Si Mn Cr Ni Mo HCr-1 2.4-2.8 0.4-1.0 0.4-1.2 10-15 0.8-2.0 0.7-2.0 HCr-2 2.4-3.0 0.3-0.8 0.5-1.3 14-19 0.8-2.0 0.7-2.0 HCr-3 2.5-3.0 0.3-0.8 0.7-1.5 16-21 0.8-2.0 1.0-1.3 HCrS 0.6-1.4 0.4-1.0 02-1.0 6-15 0.2-1.0 1.0-3.0   Physical Properties: Symbol Hardness HS Tensile strength MPa Bending strength HS Impact Value ×10 4J/m 2 Elastic Modulus kMPa   HCr-1 60-70 500-800 700-1000 4-8 210-225 HCr-2 65-80 500-800 700-1000 4-8 210-225 HCr-3 78-92 600-900 900-1300 4-8 210-225 HCrS 65-85 700-1000 210-225 Neck 35-50 >350 550 4-7 160-190   HCr-1 Work rolls for roughing stands of hot strip mills and wide plate mills. HCr-2 Work rolls for early finishing stands of hot strip mills and rolls for bar, rod mills and seamless tube straitening mills. HCr-3 Work rolls for cold strip mills and tempering mills. HCrS Work rolls for roughing and early stands of hot strip mills, for cold strip mills and plate mills   The capacity of making: Diameter of barrel (mm) Length of barrel (mm) Net weight (t) 280-1350 400-3100 32(max)