Title:
HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/079956
Kind Code:
A1
Abstract:
Provided is a hot-rolled steel sheet having an excellent appearance evaluated after obtaining of a cold-rolled steel sheet therefrom. This hot-rolled steel sheet includes, in terms of % by mass, 0.0005-0.0100% C, no more than 0.20% Si, no more than 0.50% Mn, no more than 0.030% P, 0.005-0.030% S, 0.020-0.100% Ti, 0.01-0.05% Al, no more than 0.005% N, and more than 0.005% to no more than 0.100% Cu, the remainder comprising Fe and unavoidable impurities, and has a steel composition in which Ti* defined by a specific expression satisfies the expression 0 < Ti* < 0.0200, and the steel composition satisfies the expression [(1/12) × (C%)]/[(1/32) × (S%)] < 1.00, precipitates a included in layer within 10 µm of the surface satisfy a specific expression (3), and precipitates b included in a layer within 10 µm of the surface satisfy a specific expression (6).
Inventors:
TANAKA YUJI (JP)
YAMASHITA TAKAKO (JP)
YAMASHITA TAKAKO (JP)
Application Number:
PCT/JP2019/033020
Publication Date:
April 23, 2020
Filing Date:
August 23, 2019
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/16; C22C38/60; C22C18/04
Domestic Patent References:
| WO2017212906A1 | 2017-12-14 |
Foreign References:
| JP2011236469A | 2011-11-24 | |||
| JP2011231373A | 2011-11-17 | |||
| JP2012012672A | 2012-01-19 | |||
| JP2010095753A | 2010-04-30 |
Attorney, Agent or Firm:
ITOH Hideaki et al. (JP)
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