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Title:
THIN STEEL PLATE, GALVANIZED STEEL PLATE, HOT ROLLED STEEL PLATE PRODUCTION METHOD, COLD ROLLED FULL HARD STEEL PLATE PRODUCTION METHOD, THIN STEEL PLATE PRODUCTION METHOD, AND GALVANIZED STEEL PLATE PRODUCTION METHOD
Document Type and Number:
WIPO Patent Application WO/2017/169560
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a thin steel plate, etc., having a tensile strength (TS) of at least 340 MPa, excellent workability, excellent YP in-plane anisotropy, and excellent surface properties. The thin steel plate has: a specific component composition; a steel structure wherein the average ferrite crystal grain size is 5-25 µm, at least 40% of cementite, by area ratio, is precipitated in the ferrite grain boundaries, and the ferrite aggregate composition is 0.8-7.0, by inverse intensity ratio of γ-fibers relative to α-fibers; and a tensile strength of at least 340 MPa.

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Inventors:
MINAMI HIDEKAZU (JP)
FUNAKAWA YOSHIMASA (JP)
Application Number:
PCT/JP2017/008956
Publication Date:
October 05, 2017
Filing Date:
March 07, 2017
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/60
Domestic Patent References:
WO2015015739A12015-02-05
Foreign References:
JP2015081359A2015-04-27
JP2015151600A2015-08-24
JP2004346430A2004-12-09
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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