Combined roll having excellent resistance to thermal shock

Details Combined roll having excellent resistance to thermal shock Combined roll having excellent resistance to thermal shock

1998-06-25

2000-08-29

Cuda, Irene

Roll or roller

Metal deforming roll

492 3, 492 54, B23P 1500

Patent

active

061100846

ABSTRACT:
A combined roll is provided which offers excellent resistance to thermal shock. In this combined roll, an external ring portion is formed of a cemented carbide, and an internal ring portion is formed of a ductile iron metallurgically bonded to the external ring portion by means of casting. The external ring portion is formed of a cemented carbide containing, as binder phase-defining components, Co: 5-27%, Ni: 2-12% and Cr: 0.3-3% and WC as substantially all of the balance and as a hard phase-defining component. The internal ring portion is formed of a ductile iron composed of C: 3 4.5%, Si: 1.5-4.5%, Mn: 0.1-2% and Mg: 0.02-0.2% and, as the balance, Fe and incidental impurities. The internal ring portion may also contain 0.1-5% of one or more of Mo, Cu, Cr, V, W, Sn and Sb. The internal ring portion contains a cored spheroidal graphite structure dispersed in a mixed phase of either perlite, beinite and martensite phases with a ferrite phase. The cored spheroidal graphite structure has a spheroidal graphite core formed during casting and a periphery deposited around the core during thermal treatment.

REFERENCES:
patent: 5044056 (1991-09-01), Sundstedt et al.
patent: 5104458 (1992-04-01), Sundstedt et al.
patent: 5167067 (1992-12-01), Sundstedt et al.
patent: 5248289 (1993-09-01), Carlsson et al.
patent: 5359772 (1994-11-01), Carlsson et al.

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