Title:
MANUFACTURE OF THIN GRAIN-ORIENTED SILICON STEEL SHEET
Document Type and Number:
Japanese Patent JP2703695
Kind Code:
B2
Abstract:
PURPOSE: To simultaneously prevent middle strain and side strain generated by high temp. finish annealing in a silicon steel sheet by regulating the coating weight of a separation agent for annealing essentially consisting of MgO and applied on a steel sheet subjected to decarburizing annealing into a specified coil occupancy ratio.
CONSTITUTION: In the treating stage for the grain-oriented silicon steel, the steel sheet whose final sheet thickness is regulated to ≤0.25mm by cold rolling for one or ≥two times including process annealing is subjected to decarburizing annealing and is thereafter coated with a separation agent for annealing essentially consisting of MgO (hereinafter referred to as MgO) and is subjected to high temp. finish annealing. At this time, the coating weight of the MgO is regulated so that the coil coated with the MgO will satisfy the inequality of 0.90≤W/(V×ρ)≤0.92. In the inequality, W denotes the weight (kg) of the coil coated with the MgO, V denotes the volume (m3) of the coil coated with the MgO and ρ denotes the density (kg/m3) of the steel sheet.
Inventors:
Shinya Ishii
Maeda Masakatsu
Kazumi Okamoto
Maeda Masakatsu
Kazumi Okamoto
Application Number:
JP18831892A
Publication Date:
January 26, 1998
Filing Date:
July 15, 1992
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C21D8/12; C21D1/70; C21D9/46; C23C22/00; (IPC1-7): C23C22/00; C21D8/12; C21D9/46
Domestic Patent References:
| JP644427A |
Attorney, Agent or Firm:
Hiroaki Tamura (1 outside)