公开(公告)号：US09995669B2

公开(公告)日：2018-06-12

申请号：US15327529

申请日：2015-07-17

申请人： JFE STEEL CORPORATION

发明人： Masao Yuga ,  Yasuhide Ishiguro ,  Kazuki Fujimura ,  Mitsuhiro Okatsu ,  Yoshiyuki Sugano

IPC分类号： G01N17/00 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/00 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  G01N3/08

CPC分类号： G01N17/006 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  G01N3/08 ,  G01N17/00 ,  Y10T436/184

摘要： 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−r2/4)}. Additionally, other radii of curvature of the curve being smaller than the radius of curvature R1.