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US 2023/0055650 A1Published application
High-strength seamless steel pipe and method for manufacturing same
AssigneeJfe Steel Corporation
InventorsMitsuhiro Okatsu, Masao Yuga, Toshiharu Hirama
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Abstract
Provided herein is a high-strength seamless steel pipe, and a method for manufacturing same. A high-strength seamless steel pipe of the present invention has a yield strength of 758 MPa or more, and a KILIMIT value of 23.0 MPa√m or more as an evaluation index of sulfide stress corrosion cracking resistance.
Claims12
A high-strength seamless steel pipe having a yield strength of 758 MPa or more, and a KILIMIT value of 23.0 MPa√m or more as an evaluation index of sulfide stress corrosion cracking resistance,
- where KILIMIT is a value determined from the intersection between (i) a linear regression line created by a stress intensity factor KISSC obtained in a DCB (Double Cantilever Beam) test conducted multiple times under different test conditions, and an applied stress intensity factor KIapplied at the tip of a notch in a test specimen before start of the DCB test, and (ii) a straight line on which KISSC and KIapplied are one-to-one.
Dependencies are inferred from the claim text.