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:
Sep. 14, 2010
Filed:
Nov. 09, 2004
Yoshio Igarashi, Tochigi-ken, JP;
Seiichi Endo, Tochigi-ken, JP;
Masahiro Miyake, Tochigi-ken, JP;
Tsunehiro Kawata, Saitama-ken, JP;
Yoshio Igarashi, Tochigi-ken, JP;
Seiichi Endo, Tochigi-ken, JP;
Masahiro Miyake, Tochigi-ken, JP;
Tsunehiro Kawata, Saitama-ken, JP;
Hitachi Metals, Ltd., Tokyo, JP;
Abstract
A graphite-containing, heat-resistant cast iron for exhaust equipment members used at temperatures exceeding 800° C., comprising 3.5-5.6% of Si and 1.2-15% of W on a weight basis, and having intermediate layers, in which W and Si are concentrated, in the boundaries of graphite particles and a matrix. An exhaust equipment member formed by this heat-resistant cast iron has an Atransformation point is 840° C. or higher when measured from 30° C. at a temperature-elevating speed of 3° C./minute, and a thermal cracking life of 780 cycles or more in a thermal fatigue test, in which heating and cooling are conducted under the conditions of an upper-limit temperature of 840° C., a temperature amplitude of 690° C. and a constraint ratio of 0.25.