Title:
一方向性電磁鋼板の製造方法
Document Type and Number:
Japanese Patent JP6369626
Kind Code:
B2
Abstract:
Provided is a method of manufacturing a grain-oriented electrical steel sheet including: a heating process of heating a slab having a predetermined chemical composition at T1°C of 1150°C to 1300°C, retaining the slab for 5 minutes to 30 hours, lowering the temperature of the slab to T2°C of T1-50°C or lower, heating the slab at T3°C of 1280°C to 1450°C, and retaining the slab for 5 minutes to 60 minutes; a hot-rolling process of hot-rolling the slab that is heated to obtain a hot-rolled steel sheet; a cold-rolling process; an intermediate annealing process of performing intermediate annealing with respect to the hot-rolled steel sheet at least one time before the cold-rolling process or before a final pass of the cold-rolling process after interrupting the cold-rolling; an annealing separating agent applying process; and a secondary film applying process. In the cold-rolling process, a retention treatment is performed during a plurality of passes. In the retention treatment, retention at a temperature T°C satisfying 170+[Bi]×5000‰¤T‰¤300 is performed one time to four times. A heating rate in the decarburization annealing process is 50 °C/second or faster.
Inventors:
Hirotoshi Tada
Noriyoshi Morishige
Naoto Mitsuko
Junichi Takaoushi
Shin Furuya
Katsu Takahashi
Noriyoshi Morishige
Naoto Mitsuko
Junichi Takaoushi
Shin Furuya
Katsu Takahashi
Application Number:
JP2017510252A
Publication Date:
August 08, 2018
Filing Date:
April 01, 2016
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
C21D8/12; B21B3/02; C21D9/46; C22C38/00; C22C38/60; H01F1/147
Domestic Patent References:
| JP2003089821A | ||||
| JP2001303131A | ||||
| JP8333631A | ||||
| JP3031421A |
Attorney, Agent or Firm:
Sumio Tanai
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi
Mitsuo Teramoto
Tomoo Katsumata
Hiroshi Yamaguchi