High-chromium compound roll

Details High-chromium compound roll High-chromium compound roll

1986-09-12

1988-01-26

Godici, Nicholas P.

Metal founding

Product supporting or withdrawal means for continuous...

Roller

164461, 164 98, 29132, 291484D, 148 3, 148 155, 148127, 420 15, 420 34, 428685, B22D 1112, B22D 1900

Patent

active

047211539

ABSTRACT:
A compound roll for rollng composed of a shell made of high-chromium cast iron and a core made of cast or forged steel. The shell has a large residual compressive stress. The high-chromium cast iron shell has a composition by weight of 2.0-3.5% C, 0.5-1.5% Si, 0.4-1.5% Mn, 8-25% Cr, 0.5-3.0% Mo, 1.5% or less Ni and the balance being essentially Fe for hot rolling, and 2.5-3.5% C, 0.5-1.5% Si, 0.4-1.5% Mn, 0.5-3.0% Ni, 8-25% Cr, 1.0-5.0% Mo and the balance being essentially Fe for cold rolling. The shell's Shore hardness is 70 or more for hot rolling and 90 or more for cold rolling, and the core's tensile strength and elongation are 55 kg/mm.sup.2 or more and 1.0% or more, respectively. The residual compressive stress of the shell is 20 kg/mm.sup.2 or more and serves to prevent cracks from penetrating into the depths of the shell, thereby preventing spalling effectively. This compound roll can be manufactured by a shell casting method.

REFERENCES:
patent: 3455372 (1969-07-01), Yamamoto
patent: 4191599 (1980-03-01), Stickels et al.
patent: 4546527 (1985-10-01), Fukuda et al.
patent: 4548653 (1985-10-01), Bocquet et al.
patent: 4604781 (1986-08-01), Rankin III

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