HOT-ROLLED STEEL SHEET

WIPO Patent Application WO/2024/048584

A1

This hot-rolled steel sheet has a desired chemical composition; the metal structure of this hot-rolled steel sheet at a position where the depth from the surface is 1/4 in the sheet thickness direction comprises, in area%, less than 3.0% of residual austenite, not less than 15.0% but less than 60.0% of ferrite and less than 5.0% of pearlite; alloy carbides in the ferrite has an average sphere equivalent radius of not less than 0.5 nm but less than 10.0 nm, and an average number density of not less than 0.10 × 1016 per cm3 but less than 1.45 × 1016 per cm3; the E value that indicates the periodicity of the metal structure is 10.7 or more; the I value that indicates the uniformity of the metal structure is 1.020 or more; and the standard deviation of the Mn concentration is 0.60% by mass or less.

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JP3226278	[Title of the Invention] A method for manufacturing a steel material and a steel pipe having excellent corrosion resistance and weldability.

HIROSHIMA HIDETO (JP)
SHUTO HIROSHI (JP)
KOBAYASHI YUKIKO (JP)
TSUTSUI KAZUMASA (JP)

PCT/JP2023/031225

March 07, 2024

August 29, 2023

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NIPPON STEEL CORP (JP)

C22C38/00; C21D8/02; C21D9/46; C22C38/58

WO2022044493A1	2022-03-03
WO2023149374A1	2023-08-10

JPH0479722B2

1992-12-16

MATSUNUMA Yasushi et al. (JP)

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