Low-aliquation high-speed steel roll and the preparing method

Abstract

The invention discloses a low segregation centrifugal casting high speed steel roll and the method. The roll is constituted by high speed steel roll body and alloy ductile ion roll core. The roll is produced by electric furnace. The high speed steel roll body is cast on horizontal centrifuge. As the liquid steel is cast iron powder suspension concentrate with 4%-6% by weight of liquid steel is added. After the liquid steel is cast glass waste sludge is added and then it is cooled by spraying water to form the model. Meanwhile the rotate speed of casting model is changed continuously and finally the ductile ion roll core is cast at the top statically. There is no obvious element segregation in radial section of high speed steel roll manufactured in invention. The macro hardness of roll is high and can achieve 63-65HRC. The difference of roll face hardness is less than 2HRC. The hardness fall of roll along the radial direction is small. The tensile strength of roll body is more than 600MPa and the elongation of roll core is more than 3%. The service life is improved by 5-8 times than high chromium cast iron roll and is improved by 35%-48% than common high speed steel roll. It can decrease the producing cost of rolling steel and prolong roll changing period.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a method for preparing metal rolls used for rolling steel in various rolling mills, in particular to a method for preparing low-segregation centrifugal casting high-speed steel rolls. Background technique [0002] Rolls are the main consumable spare parts in steel rolling production. The quality of rolls directly affects the operating rate of the rolling mill, the surface quality of rolled materials and the cost of steel rolling production. Improving and improving the quality of rolls is an urgent task in steel rolling production. Currently commonly used roll materials include high-nickel-chromium infinitely chilled cast iron, alloy ductile iron, high-chromium white cast iron, bainite ductile iron and semi-steel, etc., all of which have the disadvantages of low high-temperature hardness and poor high-temperature wear resistance. Because high-speed st...

AI Technical Summary

Problems solved by technology

However, the addition of electromagnetic field stirring in centrifugal casting will easily make the roll loose and reduce the mechanical properties and wear resistance of the roll.

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