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

A technology of centrifugal composite casting and metamorphism treatment, which is applied in the field of centrifugal composite casting high-speed steel roll outer layer metamorphism treatment, which can solve problems such as easy cracks, coarseness, and large roll wear, so as to ensure strength, toughness and hardness, and improve wear resistance and the effect of heat resistance

Active Publication Date: 2012-12-19
鞍钢轧辊有限公司
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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 performa

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

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[0008] The present invention will be further described below in conjunction with the embodiments.

[0009] The production methods of high-speed steel rolls include smelting, modification and spheroidization, centrifugal casting, core casting, and heat treatment. The composite modifier is added when the outer layer of the roll is smelted out of the furnace, and the heat treatment process produces tempered martensite and dispersed spherical and massive MC-type carbides to ensure that the matrix has high strength, toughness and hardness. The working steps are described as follows:

[0010] 1) The outer layer of high-speed steel molten steel is smelted in an intermediate frequency furnace at a melting temperature of 1500-1600℃. The weight percentage of the outer layer of high-speed steel material is: C: 1.5-2.5, Si: 0.4-1.5, Mn: 0.4-1.5, P: < 0.03, S: <0.03, Ni: 0.4 to 1.0, Cr: 4 to 6, Mo: 4 to 6, V: 4 to 6, the rest is Fe and inevitable impurities.

[0011] After the smelting is comple...

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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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Application Information

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IPC IPC(8): C22C38/46C22C38/56C22C33/04
Inventor 艾忠诚白云波杜立朝李艳红
Owner 鞍钢轧辊有限公司
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