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High speed steel (HSS) duplex rolls are manufactured with vertical centrifugal casting process, the shell is HSS with high hardness and excellent wear resistance at high temperature, the core is nodular cast iron with toughness, the comprehensive property is a combination of high wear resistance and toughness.

These rolls are manufactured with high content alloy elements and special heat treatment process, the microstructure of shell is martensite and bainite with plenty of carbides such as MC, M2C and M6C distributed among the matrix, there is only a little hardness drop in the shell. High alloy elements and rehardening give the rolls an excellent wear resistance at high temperature. The outer layer hardness doesn't show a significant drop until the temperature exceeds 550C. and the wear resistance is 3-5 times higher than traditional high NiCr indefinite chilled iron rolls and high Cr iron rolls..

Microstructure:

	APPLICATION: Work rolls for finishing stands for hot strip mills, work rolls for fold strip mills, rings or sleeves for bar, rod mills and universal H-section mills.
	Microstructure: Martensite + Bainite + Carbide
Chemical Composition(%) Symbol C Si Mn Cr Ni Mo v w HSS-1 0.6-1.0 0.4-1.5 0.4-1.0 4.0-8.0 0.3-1.5 2.0-8.0 0.4-2.0 1.0-3,0 HSS-2 1.5-2.5 0.3-1.0 0.3-1.5 4.0-8.0 0.3-1.5 2.0-8.0 2.0-10.0 2.0-10.0                             Physical Properties: Symbol Hardness HS Tensile Strength MPa  Elastic Modulus x 10³ MPA HSS-1 70-90 >750 210-220 HSS-2 75-95 >750 210-220 Neck 35-50 >350 140-180     The Capacity of Making: Type of Rolls Diameter of barrel (mm) Length of barrel (mm) weight (t) Rolls £X400-£X850 1000-2500 15 (Max) Sleeves £X200-£X1400 700 (Max) 7 (Max)