Title:
METHOD FOR MANUFACTURING HOT-ROLLED STEEL SHEET FOR NON-ORIENTED ELECTRICAL STEEL SHEET, METHOD FOR MANUFACTURING NON-ORIENTED ELECTRICAL STEEL SHEET, AND HOT-ROLLED STEEL SHEET FOR NON-ORIENTED ELECTRICAL STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/149287
Kind Code:
A1
Abstract:
The purpose of the present invention is to suppress ridging, which presents a problem when handling steel containing a large amount of alloy elements such as Si and Al in a slow hot-rolling process. Provided is a method for manufacturing a hot-rolled steel sheet for a non-oriented electrical steel sheet including: a continuous casting step for producing a steel slab having a predetermined component composition and a thickness of 50-200 mm inclusive by a continuous casting method; a transportation step for transporting the steel slab to hot-rolling equipment while maintaining the surface temperature of the steel slab at 800°C or above; and a hot-rolling step for sequentially performing, in the hot-rolling equipment, rough rolling, a reheating treatment, and finishing rolling on the steel slab to produce a hot-rolled steel sheet, the hot-rolling step being carried out under conditions satisfying the following (1)-(4). (1) Outlet-side speed of the hot rolling: 100 mpm or below. (2) Draft in the final pass of the rough rolling: 45% or above. (3) Average temperate increase speed in the reheating treatment: 9°C/s or above. (4) Temperature increase in the reheating treatment: 30°C or above.
Inventors:
OKUBO TOMOYUKI (JP)
SAITO HAYATO (JP)
SUEHIRO RYUICHI (JP)
UENO MASAYASU (JP)
YAMAGUCHI SHINYA (JP)
SAITO HAYATO (JP)
SUEHIRO RYUICHI (JP)
UENO MASAYASU (JP)
YAMAGUCHI SHINYA (JP)
Application Number:
PCT/JP2023/002156
Publication Date:
August 10, 2023
Filing Date:
January 24, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C22C38/00; C22C38/06; C22C38/60; H01F1/147
Foreign References:
| JPH108221A | 1998-01-13 | |||
| JPH1046250A | 1998-02-17 | |||
| JPS532332A | 1978-01-11 | |||
| JPH05222456A | 1993-08-31 | |||
| JP2011246810A | 2011-12-08 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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