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:
Oct. 07, 2025
Filed:
Feb. 03, 2021
Jfe Steel Corporation, Tokyo, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A radiant tube includes a conduit; and one or more heat transfer promoters disposed in the conduit, wherein the heat transfer promoter includes a body part on a center side of the conduit, and protruding parts protruding from the body part toward an inner wall surface of the conduit, the protruding parts are on an outer periphery of the body part to be arranged in a circumferential direction of the conduit, the protruding parts includes first protruding parts having a distal end portion facing the inner wall surface across a gap ΔL, and a second protruding part, the number of first protruding parts is greater than the number of second protruding parts, and a ratio (ΔL/Dt) of the gap ΔL to an equivalent diameter Dt of a conduit portion is x %, where the heat transfer promoter is disposed, and formula (1) is satisfied: 0.3%<x<7%.