Centrifugal casting high-speed steel composite roll and manufacture method thereof

Abstract

The invention relates to a centrifugal casting high-speed steel composite roll and a manufacture method thereof and belongs to the field of casting. The composite roll is composed of outer layer high-speed steel, middle layer graphitic steel and core high-strength nodular cast iron by centrifugal compounding. The centrifugal casting high-speed steel composite roll is based on the conventional high-carbon high-vanadium high-speed steel roll, the content of vanadium is appropriately reduced, niobium is added at the same time, and the Nb / V is controlled to be 0.3 to 0.5 so that Nb and V form complex carbide (V, Nb) C so as to avoid forming segregation under the action of centrifugal force. A roll core of the high-speed steel composite roll adopts high-strength nodular cast iron, and a multivariate graphite steel middle layer is poured between an outer layer and the roll core for preventing interfusing elements of Cr, B, and the like which cause embrittlement when the nodular cast iron is poured to be fused with the outer layer high-speed steel. Microalloying processing for refining the organization is carried out on a roll surface high-speed steel material and the middle layer graphitic steel so as to achieve the purpose of improving the thermal cracking capacity of the roll material. The centrifugal casting high-speed steel composite roll has high overall performance, long service life and good economic benefits.

Description

technical field [0001] The invention relates to a manufacturing method of a composite roll, in particular to a centrifugal casting high-speed steel composite roll and a manufacturing method thereof, belonging to the field of casting technology. Background technique [0002] With the rapid development of rolling steel production, improving the quality of rolls has become an important part. In the modern new rolling mill, the roll is required to have a deep and uniform hardness layer, a roll surface with good wear resistance, spalling resistance, thermal crack resistance and surface roughness resistance, and a roll core with certain strength and toughness. This is difficult to achieve by ordinary casting methods. The composite roll manufactured by centrifugal casting can make the liquid metal crystallize and solidify under the action of centrifugal force far exceeding tens of times of gravity, so that the roll surface with dense structure and excellent performance can be obta...

AI Technical Summary

Problems solved by technology

(2) The traditional centrifugal casting composite roll, the core material is gray cast iron or ductile iron with graphite precipitation

When it is required to use forged steel as the material of the core, the centrifugal casting method cannot do it.

Images