Method for modifying centrifugal composite casting high-speed steel roll outer layer

Abstract

The invention relates to the technical field of high-speed steel rolls, and in particular relates to a method for modifying a centrifugal composite casting high-speed steel roll outer layer, which is characterized in that when the outer layer high-speed steel smelting is completed and discharged, composite modificator is added into a steel ladle to modify the high-speed molten iron, the adding amount of the composite modificator is 1.0-2.0% of the weight of the molten iron, and the reaction temperature is 1500-1600 DEG C. The composite modificator comprises the following chemical constituents by weight percent: 50-55% of FeV50, 50-55% of rare earth ferrosilicon alloy FeSiRe21, 20-25% of silicon barium alloy FeBa5Si60 and 5-10% of Al. Compared with the prior art, the method has the advantages that casting grains are thinned, the states of chromium compounds and carbide are improved, fine spherical MC type carbide is uniformly dispersed and distributed, so the wear resistance and heat resistance of the high-speed steel roll outer layer are improved, and the millimeter rolled metal of the roll is increased by 25%-30% comparatively.

Description

technical field [0001] The invention relates to the technical field of centrifugal compound casting high-speed steel rolls, in particular to a method for treating the outer layer of high-speed steel rolls with centrifugal compound casting. Background technique [0002] When the high-speed steel roll is centrifugally composite cast, the material of the outer high-speed steel is solidified in a centrifugal state, and there is a phenomenon that the carbide structure is unevenly distributed and coarse. The grain size, type, size, and distribution of carbide in the outer high-speed steel structure Volume fraction and other microstructural features play an extremely critical role in the performance of high-speed steel. During the casting process of high-speed steel rolls, coarse eutectic carbides are particularly easy to form, and it is difficult to eliminate them by heat treatment. As a result, the performance of the high-speed steel roll is seriously deteriorated, the wear resis...

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Problems solved by technology

[0002] When the high-speed steel roll is centrifugally composite cast, the material of the outer high-speed steel is solidified in a centrifugal state, and there is a phenomenon that the carbide structure is unevenly distributed and coarse. The grain size, type, size, and distribution of carbide in the outer high-speed steel structure Volume fraction and other microstructural features play an extremely critical role in the performance of high-speed steel. During the casting process of high-speed steel rolls, coarse eutectic carbides are particularly easy to form, and it is difficult to eliminate them by heat treatment. As a result, the performance of the high-speed steel roll is seriously deteriorated, the wear resistance and heat resistance of the outer layer of the roll are not good, and the wear of the roll is large during use, and cracks are easy to occur

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