# US 10,455,648 B2 · Method and apparatus for heating steel sheet

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- Number: US 10,455,648 B2
- Document ID: US10455648B2
- Status: Granted
- Kind: B2
- Application number: 14/127,735
- Filed: 2012-07-25
- Published: 2014-05-08
- Granted: 2019-10-22
- Earliest claimed: 2011-07-28
- Assignees: Jfe Steel Corporation
- Applicants: Yoshimichi Hino; Hirokazu Sugihara
- Inventors: Yoshimichi Hino; Hirokazu Sugihara
- Web page: https://patentgrep.com/patent/US10455648B2

## CPC

- H05B 6/101: {for local heating of metal pieces}
- C21D 1/42: Induction heating
- C21D 1/60: Aqueous agents
- C21D 8/12: during manufacturing of articles with special electromagnetic properties
- C21D 9/60: with induction heating
- F27D 2099/0015: {Induction heating}
- Y02P 10/25: Process efficiency
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The invention proposes a method for heating a steel sheet wherein the generation of buckling can be prevented regardless of presence or absence of rolls restraining the steel sheet by antecedently heating the widthwise central portion of the steel sheet with a solenoid type induction heating coil having a convex form projected onto the surface of the steel sheet toward an upstream side in rapidly heating the continuously traveling steel sheet, whereby an isotherm of the steel sheet in the heating is a convex form toward the upstream side, so that a large wrinkle is generated on the steel sheet, and also proposes a heating apparatus used in this method.

## Claims

### Claim 1

A method for heating a steel sheet, the method comprising:
heating a continuously traveling steel sheet;
generating wrinkle in a widthwise central portion of the steel sheet by pre-heating the steel sheet before heating the continuously traveling steel sheet; and
spreading the wrinkle up to a widthwise edge portion of the sheet by thereafter enlarging a heating zone.

### Claim 2 (depends on 1)

A method for heating a steel sheet according to claim 1, wherein the steel sheet is pre-heated so that an isotherm in the heating is a convex form toward an upstream side.

### Claim 3 (depends on 2)

A method for heating a steel sheet according to claim 2, wherein the convex form is circular arc or V-shaped.