STEEL MATERIAL - NIPPON STEEL CORP

Title:

STEEL MATERIAL

Document Type and Number:

WIPO Patent Application WO/2023/204294

Kind Code:

A1

Abstract:

Provided is a steel material that has high strength and excellent SSC resistance. The steel material according to the present disclosure contains, by mass%, 0.20%–0.35% C, 0.60%–1.30% Si, 0.05%–0.25% Mn, no more than 0.050% P, no more than 0.0100% S, 0.010%–0.100% Al, no more than 0.0100% N, 0.20%–1.00% Cr, 0.10%-1.00% Mo, and 0.003%–0.030% Ti, the remainder being Fe and impurities. If the steel material is 110 ksi-grade, EE of formula (1) is at least 2.75 and FN of formula (2) is at least 0.185. If the steel material is 125 ksi-grade, EE is at least 3.00 and FN is at least 0.200.　Formula (1): EE = -0.25C+2Si-5.8Mn+2.1Cr+Mo+4.1Zr+2.6Sb+0.3Cu+0.4Ni+1.5Co. Formula (2): FN = EE/(D0.9) (D: average equivalent circle diameter (μm) of prior austenite grains).

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Inventors:

FUJI HIROYUKI (JP)
YOSHIDA SHINJI (JP)
ARAI YUJI (JP)
KONDO KEIICHI (JP)

Application Number:

PCT/JP2023/015878

Publication Date:

October 26, 2023

Filing Date:

April 21, 2023

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)

International Classes:

C22C38/00; C22C38/60; C21D8/10; C21D9/08

Domestic Patent References:

WO2020090478A1	2020-05-07
WO2020166675A1	2020-08-20
WO2018043570A1	2018-03-08

Foreign References:

JP2018188696A

2018-11-29

Attorney, Agent or Firm:

ASCEND IP LAW FIRM (JP)

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