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The present study aims at develo pi ng high speed steel (HSS) as roll materials to replace traditional roll material s such as the alloy cast iron and powder metallurgical (PM) hard alloy, because low-cost alloy cast iron rolls have poor wear resistance and the cost of high- quality PM hard alloy rolls is too high to be accepted by some users. By means o f a centrifugal casting method, HSS rolls with excellent wear resistance have be en developed. Its hardness is 65～67HRC, and its variation is smaller than 2HRC; its impact toughness excels 15J/cm 2. Using pre-finishing stands of a high -speed hot wire-rod rolling mill, the wear rate of HSS rolls per one thousand ton of steel is 0.25mm. However, the manufacturing burden of HSS rolls is obviou sly lower than that of PM hard alloy rolls; it is only 30% of that of PM hard al loy rolls.
The present study aims at develo pi ng high speed steel (HSS) as roll materials to replace the traditional roll material s such as the alloy cast iron and powder metallurgical (PM) hard alloy, because low-cost alloy cast iron rolls have poor wear resistance and the cost of high quality PM hard alloy rolls is too high to be accepted by some users. By means of a centrifugal casting method, HSS rolls with excellent wear resistance have be en developed. Its hardness is 65 ~ 67HRC, and its variation is smaller than 2HRC; its impact toughness excels 15J / cm 2. Using pre-finishing stands of a high-speed hot wire-rod rolling mill, the wear rate of HSS rolls per one thousand ton of steel is 0.25mm. However, the manufacturing burden of HSS rolls is obviou sly lower than that of PM hard alloy rolls; it is only 30% of that of PM hard al loy rolls.