THICK STEEL SHEET AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2024/038684

A1

The present invention provides a thick steel sheet which has high strength, low yield ratio and high toughness at the same time, while achieving excellent toughness in a joint bond part even in cases of high heat input welding wherein the amount of welding heat input is more than 40 kJ/mm. The present invention provides a thick steel sheet which has a specific component composition and a specific microstructure, and which has a Charpy absorbed energy vE0 of 70 J or more at 0°C and an Mn concentration distribution wherein: the area fraction of average Mn concentration regions, which are defined as the regions having an Mn concentration that is 0.9 to 1.1 times the average Mn content (% by mass), is less than 90%; the area fraction of Mn-enriched regions, which are defined as the regions having an Mn concentration that is not less than 1.15 times the average Mn content (% by mass), is 1.0% or more; and the average circle-equivalent diameter of the Mn-enriched regions is 7.0 µm or less.

JP6536761	Steel plate and steel plate manufacturing method
JPS5354118	PRODUCTION OF HIGH TENSILE STEEL SHEET WITH EXCELLENT BRITTLENESS CRACKPROPAGATION STOPPING PROPERTIES
JPH10286681	PRODUCTION OF TITANIUM-CLAD STEEL SHEET

YUGA MASAO (JP)
SATO YUYA (JP)
MURAKAMI SHUNICHI (JP)
MURAKAMI YOSHIAKI (JP)
SUEYOSHI HITOSHI (JP)
HYODO YOSHIHIRO (JP)

PCT/JP2023/023875

February 22, 2024

June 27, 2023

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JFE STEEL CORP (JP)

C21D8/02; C22C38/00; C22C38/14; C22C38/58

JP2018090872A	2018-06-14
JP2023045253A	2023-04-03
JP2020117796A	2020-08-06
JP2020204075A	2020-12-24
JP2006291349A	2006-10-26
JP2013129885A	2013-07-04
US20200392608A1	2020-12-17

SUGIMURA Kenji (JP)

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