公开(公告)号：EP3226278A4

公开(公告)日：2017-12-27

申请号：EP15862942

申请日：2015-03-23

申请人： JFE STEEL CORP

发明人： TANAKA YUJI ,  YAMASHITA TAKAKO ,  NAGOSHI MASAYASU

IPC分类号： H01J37/20 ,  G01N23/207 ,  G01N23/225 ,  H01J37/18 ,  H01J37/252 ,  H01J37/28

CPC分类号： G01N23/2252 ,  G01N23/207 ,  H01J37/18 ,  H01J37/20 ,  H01J37/252 ,  H01J37/256 ,  H01J37/28 ,  H01J2237/022 ,  H01J2237/2561

摘要： The present invention makes it possible to analyze trace carbon in a sample without the effects of contamination. In an electron probe microanalyzer, a liquid nitrogen trap (6) and a plasma or oxygen radical generator are jointly used as a means for suppressing contamination, and two or more carbon detection units (9, 10) for detecting characteristic x-rays (8) of carbon in the sample (7) are provided.

公开(公告)号：EP2801634A4

公开(公告)日：2015-03-11

申请号：EP12864523

申请日：2012-12-26

申请人： JFE STEEL CORP

发明人： NAGANO HIDEKI ,  HARAKO DAISUKE ,  TANAKA YUJI

IPC分类号： C22C38/00 ,  B32B15/01 ,  C21D9/46 ,  C22C18/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C23C2/06 ,  C23C2/28

CPC分类号： B32B15/013 ,  C21D8/0226 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/46 ,  C21D2211/004 ,  C22C18/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

公开(公告)号：EP2453032A4

公开(公告)日：2014-06-25

申请号：EP10797090

申请日：2010-06-29

申请人： JFE STEEL CORP

发明人： NAKAGAWA KOICHI ,  YOKOTA TAKESHI ,  SETO KAZUHIRO ,  KINOSHIRO SATOSHI ,  TANAKA YUJI ,  YAMADA KATSUMI ,  MEGA TETSUYA ,  NAKAJIMA KATSUMI

IPC分类号： C22C38/00 ,  C21D9/46 ,  C22C38/14 ,  C22C38/38

CPC分类号： C22C38/02 ,  C21D8/0226 ,  C21D8/0273 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/24 ,  C22C38/28 ,  Y10T428/12229

公开(公告)号：EP2447386A4

公开(公告)日：2016-06-15

申请号：EP10792232

申请日：2010-06-23

申请人： JFE STEEL CORP

发明人： EGUCHI KENICHIRO ,  TANAKA YUJI ,  KIMURA MITSUO ,  ISHIGURO YASUHIDE ,  YAMADA KATSUMI ,  NAKAMICHI HARUO

IPC分类号： C22C38/00 ,  C21D9/08 ,  C21D9/14 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC分类号： C21D9/14 ,  C21D2211/004 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

摘要： Provided is a high-strength seamless steel tube, having excellent resistance to sulfide stress cracking (SSC resistance), for oil wells. In particular, the seamless steel tube contains 0.15% to 0.50% C, 0.1% to 1.0% Si, 0.3% to 1.0% Mn, 0.015% or less P, 0.005% or less S, 0.01% to 0.1% Al, 0.01% or less N, 0.1% to 1.7% Cr, 0.4% to 1.1% Mo, 0.01% to 0.12% V, 0.01% to 0.08% Nb, and 0.0005% to 0.003% B or further contains 0.03% to 1.0% Cu on a mass basis and has a microstructure which has a composition containing 0.40% or more solute Mo and a tempered martensite phase that is a main phase and which contains prior-austenite grains with a grain size number of 8.5 or more and 0.06% by mass or more of a dispersed M 2 C-type precipitate with substantially a particulate shape.