Compound roll and method of producing same

Details Compound roll and method of producing same Compound roll and method of producing same

1994-08-11

1996-01-16

Cuda, Irene

Roll or roller

Single annular member, per se

Specific metallic composition

164 95, 2989532, 148541, B22D 1302

Patent

active

054843723

ABSTRACT:
The compound roll having a shell portion made of a hard, high-alloy cast steel or iron having excellent wear resistance and resistance to surface roughening and a core portion made of a tough cast iron or cast steel, the cast iron of the shell portion having a composition consisting essentially, by weight ratio, of 1.0-3.0% of C, 2.0% or less of Si, 2.0% or less of Mn, 2.0-15.0% of Cr, 10.0% or less of Mo, 2.0-8.0% of V, the balance being substantially Fe and inevitable impurities, an average diameter of crystal grains constituting a matrix of the metal structure of the shell portion being 100 .mu.m or less in a range from a surface to a depth of 50 mm when determined by an image analysis method on the crystal grains having diameters exceeding 30 .mu.m, and the crystal grains satisfying the formula: m.sub.2 .ltoreq.1.2 m.sub.1, wherein m.sub.1 is an average diameter of the crystal grains at the surface of the shell portion, and m.sub.2 is an average diameter of the crystal grains at the depth of 50 mm, is produced by a centrifugal casting method which comprises supplying a melt for the shell portion at a temperature T satisfying the formula: Tc.ltoreq.T.ltoreq.Tc+90.degree. C., wherein Tc is a primary crystal-forming temperature of the melt for the shell portion, to a hollow cylindrical mold rotatable around its longitudinal axis, at such a speed that an average shell portion-forming speed in the mold is 2-40 mm/min.

REFERENCES:
patent: 4191599 (1980-03-01), Stickels et al.
patent: 4374721 (1983-02-01), Hara et al.
patent: 5225007 (1993-07-01), Hattori et al.
patent: 5305522 (1994-04-01), Nawata et al.

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