HOT-ROLLED STEEL SHEET - NIPPON STEEL CORP

Title:

HOT-ROLLED STEEL SHEET

Document Type and Number:

WIPO Patent Application WO/2023/132254

Kind Code:

A1

Abstract:

This hot-rolled steel sheet has a prescribed chemical composition. The metal structure at a position of 1/4 of the sheet thickness and at a position 100 μm from the surface is such that by area, one or more of martensite and tempered martensite represent 95% or above in total, and ferrite, bainite and perlite represent 5% or below in total. The average dislocation density at the position 100 μm from the surface is at least 1.2 times the average dislocation density at the position of 1/4 of the sheet thickness.

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Inventors:

ITO DAISUKE (JP)
SAKAKIBARA AKIFUMI (JP)
HAYASHIDA TERUKI (JP)
YOKOI TATSUO (JP)
KUSUMI KAZUHISA (JP)

Application Number:

PCT/JP2022/047271

Publication Date:

July 13, 2023

Filing Date:

December 22, 2022

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)

International Classes:

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

Domestic Patent References:

WO2016157896A1	2016-10-06
WO2021085336A1	2021-05-06
WO2010143726A1	2010-12-16
WO2022153927A1	2022-07-21

Foreign References:

JP2018188675A

2018-11-29

Attorney, Agent or Firm:

MATSUNUMA Yasushi et al. (JP)

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