Material of intermediate layer for centrifugally casting boracic high-speed steel composite rolls

Abstract

The invention relates to a material of an intermediate layer for centrifugally casting boracic high-speed steel composite rolls, which comprises the following chemical compositions in percentage by weight: 2.2-2.5 percent of C, 1.8-2.2 percent of Si, 0.3-0.6 percent of Mn, 0.08-0.15 percent of Ti, 0.06-0.18 percent of Ce, 0.03-0.06 percent of Mg, 0.02-0.06 percent of Ca, 0.03-0.08 percent of Ba, 0.4-0.7 percent of Cu, 0.03-0.08 percent of B, less than 0.15 percent of Mo, less than 0.15 percent of V, less than 0.10 percent of Co, less than 0.10 percent of Nb, less than 0.15 percent of W, 0.6-0.8 percent of Cr, more than 0.35 and less than 0.55 percent of a mixture of V, Mo, Nb, Co and W, and balance of Fe and inevitable trace impurities. The intermediate layer for centrifugally casting the boracic high-speed steel composite rolls can be well metallurgically combined with an outer layer and a roll core, so that the boron content of the roll core can be decreased to be below 0.003 percent, ensuring the high strength and high toughness of the roll core, and eliminating the occurrence of roll breakage accidents when the rolls are used.

Description

technical field [0001] The invention belongs to the technical field of centrifugal casting, and in particular relates to an intermediate layer material of a centrifugal casting composite roll, in particular to an intermediate layer material of a centrifugal casting boron-containing high-speed steel composite roll. Background technique [0002] In boron-containing high-speed steel rolls, the production cost is lower because of the small amount of precious alloy added. In addition, in addition to boron forming high-hardness carbon-boron compounds, part of boron enters the matrix, which can improve the hardenability and hardenability of the matrix, and contribute to the improvement of the wear resistance of boron-containing high-speed steel rolls. However, in the production process of boron-containing high-speed steel rolls, the boron element in the outer layer is easily mixed into the roll core, which increases the boron content of the roll core, resulting in a decrease in the...

AI Technical Summary

Problems solved by technology

Since the middle layer contains more chromium, it is easy to precipitate brittle carbides, resulting in high brittleness of the middle layer, which is prone to cracking during use and affects the normal production of rolled steel.

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