The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 12, 2018
Filed:
Jul. 17, 2015
Jfe Steel Corporation, Tokyo, JP;
Masao Yuga, Handa, JP;
Yasuhide Ishiguro, Handa, JP;
Kazuki Fujimura, Handa, JP;
Mitsuhiro Okatsu, Handa, JP;
Yoshiyuki Sugano, Chiba, JP;
JFE STEEL CORPORATION, Tokyo, JP;
Abstract
A round bar tensile test specimen for a sulfide stress corrosion cracking test of a steel, the specimen including a parallel section, a shoulder section, and a grip section. A sectional shape of the shoulder section being formed by a curve having two or more radii of curvature. A radius of curvature R1 (mm) of a portion of the curve adjacent to the parallel section being 15 mm or more, and the radius of curvature R1 (mm) satisfying (0.22σ−119)≤R1≤100 in terms of load stress σ (MPa) of the sulfide stress corrosion cracking test. A length X1 (mm) of the portion of the curve having the radius of curvature R1 in a longitudinal direction of the test specimen satisfying X1≥√{(r/8)×(R1−r/4)}. Additionally, other radii of curvature of the curve being smaller than the radius of curvature R1.