The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 26, 1988
Filed:
Sep. 12, 1986
Hitachi Metals, Inc., , JP;
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.