STEEL SHEET FOR CROWN CAPS, PRODUCTION METHOD THEREFOR, AND CROWN CAP

Title:

STEEL SHEET FOR CROWN CAPS, PRODUCTION METHOD THEREFOR, AND CROWN CAP

Document Type and Number:

WIPO Patent Application WO/2018/061787

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide: a steel sheet for crown caps which has sufficient pressure resistance and formability even if reduced in thickness; a method for producing the steel sheet for crown caps; and a crown cap. The present invention provides a steel sheet for crown caps, wherein the steel sheet has a predetermined component composition, the value of N total – (N as AlN) is 0.0090 to 0.0170%, the maximum particle size of a carbide in a rolling-direction cross section is 2.0 μm or less, and the yield strength in the rolling direction is 420 to 600 MPa. The present invention also provides a method for producing a steel sheet for crown caps comprising: a hot rolling step of winding a steel material having a predetermined component composition at a predetermined temperature after finish rolling; a primary cold rolling step; a continuous annealing step of heating at an average heating rate of 10°C/s to 30°C/s in a temperature range A of 500 to 600°C in a heating process, annealing at an annealing temperature B in a temperature range of 620 to 740°C, cooling from the annealing temperature B to a cooling stop temperature C in a temperature range of 400 to 580°C at an average cooling rate of 20°C/s or more, and setting the time of residence in the temperature range of 400 to 580°C after stopping cooling at the average cooling rate to 30 to 90 seconds; and a secondary cold rolling step of cold rolling at a rolling reduction ratio of 1.0 to 12%.

Inventors:

KARIYA NOBUSUKE (JP)
HIRAGUCHI TOMONARI (JP)
KOJIMA KATSUMI (JP)
UMEMOTO MASASHI (JP)
TSUJIMOTO MASAMI (JP)

Application Number:

PCT/JP2017/033179

Publication Date:

April 05, 2018

Filing Date:

September 14, 2017

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C21D9/46; C22C38/06

Domestic Patent References:

WO2012077628A1	2012-06-14
WO2016084353A1	2016-06-02

Foreign References:

JP2009263788A	2009-11-12
JPS50139013A	1975-11-06
CN102766800A	2012-11-07
JPS6134159A	1986-02-18
JP2001049383A	2001-02-20
JP2013028842A	2013-02-07
JP2012072439A	2012-04-12

Other References: