ULTRA-THIN SHEET STEEL AND METHOD FOR MANUFACTURING THE SAME

Title:

ULTRA-THIN SHEET STEEL AND METHOD FOR MANUFACTURING THE SAME

Document Type and Number:

WIPO Patent Application WO/1997/033706

Kind Code:

A1

Abstract:

A method for manufacturing an ultra-thin sheet steel comprising the steps of roughly rolling a steel billet into a sheet bar, but joining the sheet bar so rolled to a preceding sheet bar, heating widthwise edge portions of the sheet bars so joined by means of edge heaters, continuously cross rolling joined bars by means of paired cross rolls at least at three stands for finishing to produce a hot rolled steel strip having a sheet width of 950 mm or greater, a sheet thickness of 0.5-2 mm and a crown of U 40 'mu'm or less, cold rolling, continuously annealing and temper rolling the hot rolled steel strip, and plating the surface of a cold rolled steel strip as required to produce a sheet steel having an average sheet thickness of 0.20 mm or less, a sheet width of 950 mm or greater, and a sheet thickness variation in a sheet width direction of U 4 % of the average sheet thickness and a hardness (HR30T) variation in the sheet width direction of U 3 or less of the average hardness in a range not less than 95 % of a sheet width.

Inventors:

ARATANI MAKOTO (JP)
RYU NAOTOSHI (JP)
KUGUMINATO HIDEO (JP)
TOSAKA AKIO (JP)
OKUDA KANEHARU (JP)
ARATANI MASATOSHI (JP)
OKADA SUSUMU (JP)

Application Number:

PCT/JP1997/000826

Publication Date:

September 18, 1997

Filing Date:

March 14, 1997

Export Citation:

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Assignee:

KAWASAKI STEEL CO (JP)
ARATANI MAKOTO (JP)
RYU NAOTOSHI (JP)
KUGUMINATO HIDEO (JP)
TOSAKA AKIO (JP)
OKUDA KANEHARU (JP)
ARATANI MASATOSHI (JP)
OKADA SUSUMU (JP)

International Classes:

B21B1/22; B21B1/24; B21B1/26; B21B1/28; B21B3/00; C21D8/02; C21D9/46; C21D9/48; C22C38/00; C22C38/06; C22C38/54; C25D5/26; B21B1/38; B21B1/40; B21B13/02; B21B15/00; B21B45/00; (IPC1-7): B21B1/26; B21B1/28; C22C38/06

Foreign References:

JPH0788519A	1995-04-04
JPS62234613A	1987-10-14
JPH07110363B2	1995-11-29
JPH07115052B2	1995-12-13
JPH0641683A	1994-02-15

Other References: