Title:
PRODUCTION OF NONORIENTED SILICON STEEL SHEET HAVING SUPERIOR MAGNETIC PROPERTY AND EXCELLENT IN EXTERNAL SURFACE APPEARANCE
Document Type and Number:
Japanese Patent JP2500033
Kind Code:
B2
Abstract:
PURPOSE: To produce a nonoriented silicon steel sheet having high magnetic flux density and excellent in external surface appearance by subjecting a hot rolled strip of low carbon steel to light-degree cold rolling and to short-time annealing, on the premise that continuous annealing is done, and controlling crystalline grain size.
CONSTITUTION: A slab which has a composition consisting of, by weight, ≤0.02% C, ≤4.0% Si or (Si+Al), ≤1.0% Mn, ≤0.2% P, and the balance essentially Fe and further containing, if necessary, ≤0.10%, in total, of Sb and/or Sn is hot-rolled into a hot rolled steel strip, cold-rolled at 5-15% draft, and annealed so that crystalline grain size is regulated to 100-200μm. Subsequently, one is formed to the final sheet thickness by means of cold rolling and then subjected to final annealing, and the other is cold-rolled at ≥50% draft, annealed so that ≤20μm crystalline grain size is reached, further cold-rolled at 1-15% draft to the product sheet thickness, and then subjected to final annealing.
Inventors:
MANABE MASAHIKO
MURO YOSHINARI
SUGA TAKAHIRO
OBARA TAKASHI
KOBAYASHI HIDEO
MORITA KAZUMI
IIDA YOSHIAKI
MURO YOSHINARI
SUGA TAKAHIRO
OBARA TAKASHI
KOBAYASHI HIDEO
MORITA KAZUMI
IIDA YOSHIAKI
Application Number:
JP32616391A
Publication Date:
May 29, 1996
Filing Date:
December 10, 1991
Export Citation:
Assignee:
KAWASAKI STEEL CO
International Classes:
C21D8/12; C21D9/46; C22C38/00; C22C38/06; H01F1/16; (IPC1-7): C21D8/12; C22C38/00; C22C38/06; H01F1/16
Domestic Patent References:
| JPH02263952A | ||||
| JPH01306523A |
Attorney, Agent or Firm:
Eiichi Kobayashi