NITRIDING EQUIPMENT FOR ORIENTED ELECTROMAGNETIC STEEL PLATE AND NITRIDING METHOD

Title:

NITRIDING EQUIPMENT FOR ORIENTED ELECTROMAGNETIC STEEL PLATE AND NITRIDING METHOD

Document Type and Number:

WIPO Patent Application WO/2014/125841

Kind Code:

A1

Abstract:

Equipment that continuously nitrides strips that continuously passing through a production line for oriented electromagnetic steel plates, after cold rolling and before secondary recrystallization annealing. The equipment comprises a nitriding zone in which strips are nitrided, a cooling zone in which the strips are cooled, and a heating zone in which strips are heated prior to the nitriding zone if necessary. An electrode for glow discharging is arranged in the nitriding zone. Plasma nitriding by glow discharging is performed on the strip being used as a negative electrode, using this electrode for glow discharging as a positive electrode. As a result, inhibitor-forming elements are dispersed across the entire length and the entire width of the strip, and an oriented electromagnetic steel plate having excellent magnetic properties with no variation is obtained thereby.

Inventors:

MATSUDA HIROSHI (JP)
TAKAHASHI HIDEYUKI (JP)
YAMAGUCHI HIROI (JP)
HAYAKAWA YASUYUKI (JP)
TERASHIMA TAKASHI (JP)
WAKISAKA YUIKO (JP)

Application Number:

PCT/JP2014/000820

Publication Date:

August 21, 2014

Filing Date:

February 18, 2014

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C23C8/38; C21D8/12; C21D9/46; H01F1/16

Foreign References:

JPH08158038A	1996-06-18
JPH02213460A	1990-08-24
JPH09118964A	1997-05-06
JPH04235222A	1992-08-24
JPH046221A	1992-01-10
JPH04131376A	1992-05-06
US1965559A	1934-07-03
JP4321120B2	2009-08-26
JP2771634B2	1998-07-02
JP3940205B2	2007-07-04
JP4015644B2	2007-11-28
JP5113469B2	2013-01-09
JPH03122227A	1991-05-24

Other References: