Title:
MANUFACTURE OF COLD ROLLED AND GALVANIZED STEEL SHEET HAVING EXCELLENT MATERIAL UNIFORMITY OF COIL
Document Type and Number:
Japanese Patent JP3260605
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the consumption of energy required for annealing, to save the waste for cutting a defective part of a produced sheet and to improve its yield by regulating the annealing temp. so as to obtain the material uniformity of a coil produced in a continuous annealing or galvanizing line.
SOLUTION: Barkhausen signals of a hot rolled coil are continuously measured with a non-contact way using a magnetic head before a cold rolling, the measured value is compared with the relationship between the voltage value of Barkhausen signals and the bulky crystal grain size which are previously obtained every the kind of steels, whereby the variation of the crystal grain size in the longitudinal direction of the hot rolled coil is obtained and the annealing temp. is decided so that the coil material after annealing becomes uniform. According to this, the annealing temp. is regulated in the longitudinal direction in the continuous annealing or galvanizing line.
Inventors:
Hirohide Asano
Koji Sakuma
Makoto Tefun
Toru Inaguma
Hiroaki Sakamoto
Koji Sakuma
Makoto Tefun
Toru Inaguma
Hiroaki Sakamoto
Application Number:
JP27997995A
Publication Date:
February 25, 2002
Filing Date:
October 27, 1995
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C21D9/46; C21D9/52; C21D11/00; (IPC1-7): C21D9/46; C21D9/52; C21D11/00
Attorney, Agent or Firm:
Yu Shiina (1 person outside)