Tool Steel RollsTool steel rolls newly developed by our company are manufactured in base of hot working die steel,Website:http://www.kdroll.com,whose working condition is similar to that of breakdown rolls ,even worse. It is formed in the high temperature state and has high thermal strength, high thermal stability, excellent wearability and resistance to thermal fatigue and temper stability. This type of rolls is used for blooming of large section mills to have a much longer service life. Chemical Composition %SymbolCSiMnCrNiMoVHWDⅠ0.50-0.60≤0.400.50-0.800.50-0.801.40-1.800.15-0.30HWDⅡ0.40-0.470.40-0.700.40-0.601.50-2.000.80-1.200.80-1.200.30-0.50HWDⅢ0.32-0.420.80-1.20≤0.404.50-5.501.60-2.40(W)0.60-1.00HWDⅣ0.35-0.450.8-1.200.25-0.703.00-3.752.00-.000.25-0.75Prosperities&ApplicationSymbolHardnessHSTensile StrengthMPaApplicationHWDⅠ55-58≥1200Blooming and Roughing stands of large section millsHWDⅡ54-56≥1200HWDⅢHWDⅣ