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Title:
STEEL SHEET FOR CROWN CAP, CROWN CAP, AND METHOD FOR MANUFACTURING STEEL SHEET FOR CROWN CAP
Document Type and Number:
WIPO Patent Application WO/2019/026739
Kind Code:
A1
Abstract:
Provided is a steel sheet which is for a crown cap and by which a crown cap can be manufactured, the steel sheet having a composition containing, by mass%, 0.0060%-0.0100% of C (exclusive of 0.0060%), at most 0.05% of Si, 0.05%-0.60% of Mn, at most 0.050% of P, at most 0.050% of S, 0.020%-0.050% of Al, 0.0070%-0.0140% of N, and the remainder comprising Fe and inevitable impurities, wherein: a ferrite phase is present in a region ranging from the depth of 1/4 of a sheet thickness to the center of the sheet thickness; the standard deviation of a ferrite particle diameter in the ferrite phase is 7.0 μm or less; a yield strength in the rolling direction is 560-700 MPa; and the difference between a yield strength under 2%-deformation tensile test in the rolling direction and a yield strength under tensile test after subjected to heat treatment for twenty minutes at 170°C is 25 MPa or more. Thus, this steel sheet has good formability and also exhibits a pressure-resistant strength enough to be used for beverage having high content of carbon dioxide gas, by utilizing a soft liner even when applied to a thin-walled product.

Inventors:
KARIYA NOBUSUKE (JP)
UENO TAKASHI (JP)
YAMAMOTO YOSHIHIDE (JP)
KOJIMA KATSUMI (JP)
TATENO BUNGO (JP)
Application Number:
PCT/JP2018/027995
Publication Date:
February 07, 2019
Filing Date:
July 25, 2018
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; B65D41/12; C21D9/46; C22C38/60
Domestic Patent References:
WO2015129191A12015-09-03
Foreign References:
JP2015199987A2015-11-12
JP2015137422A2015-07-30
JP2013133497A2013-07-08
JP2000248335A2000-09-12
JPS6057023B21985-12-12
Other References:
See also references of EP 3663427A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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