公开(公告)号：EP2474381B8

公开(公告)日：2019-07-24

申请号：EP10812061.9

申请日：2010-08-30

申请人： Nippon Steel Corporation

发明人： OIKAWA, Hatsuhiko ,  HAMATANI, Hideki ,  AZUMA, Masafumi ,  SUZUKI, Noriyuki ,  WATANABE, Fuminori ,  MARUYAMA, Naoki ,  KAWATA, Hiroyuki

IPC分类号： B23K11/11 ,  B23K11/16 ,  B23K11/24 ,  B23K11/36 ,  B23K31/00 ,  B23K103/04 ,  B32B15/01 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  B23K101/18 ,  B23K101/34 ,  C22C38/02

公开(公告)号：EP3744466A1

公开(公告)日：2020-12-02

申请号：EP18901019.2

申请日：2018-01-22

申请人： NIPPON STEEL CORPORATION

发明人： WATANABE, Kotaro ,  HAMATANI, Hideki ,  WATANABE, Fuminori ,  TANAKA, Kimiharu ,  TAKEDA, Yusuke ,  TOMONAGA, Yuya ,  HASHIMOTO, Yoshihiro ,  HAYASHI, Masahide

IPC分类号： B23K13/06 ,  B21C37/08 ,  B23K13/00

摘要： What is provided is an electric resistance welded steel pipe manufacturing device that is configured to perform welding while forming a strip-shaped steel sheet in a tubular shape and supplying a plasma flow to a pair of abutment end surfaces to perform shielding. The electric resistance welded steel pipe manufacturing device includes a mandrel; and a plasma flow feeder that is provided in the mandrel to supply the plasma flow.

公开(公告)号：EP2474381A1

公开(公告)日：2012-07-11

申请号：EP10812061.9

申请日：2010-08-30

申请人： Nippon Steel Corporation

发明人： OIKAWA, Hatsuhiko ,  HAMATANI, Hideki ,  AZUMA, Masafumi ,  SUZUKI, Noriyuki ,  WATANABE, Fuminori ,  MARUYAMA, Naoki ,  KAWATA, Hiroyuki

IPC分类号： B23K11/11 ,  B23K11/16 ,  B23K11/24 ,  B23K11/36 ,  B23K31/00 ,  B23K103/04

CPC分类号： B23K11/115 ,  B23K11/16 ,  B23K11/166 ,  B23K2101/18 ,  B23K2101/34 ,  B23K2103/04 ,  B32B15/011 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  Y10T428/12347 ,  Y10T428/12965

摘要： Provided is a spot welded joint (10) which includes at least one thin steel plate with a tensile strength of 750 MPa to 1850 MPa and a carbon equivalent Ceq of equal to or more than 0.22 mass% to 0.55 mass% and in which a nugget (3) is formed in an interface of the thin steel plates (1A, 1B). In a nugget outer layer zone, a microstructure consists of a dendrite structure in which an average value of arm intervals is equal to or less than 12 µm, an average grain diameter of carbides contained in the microstructure is 5 nm to 100 nm, and a number density of carbides is equal to or more than 2 × 10 6 /mm2 .

摘要翻译： 提供一种点焊接头（10），其包括至少一个抗拉强度为750MPa至1850MPa的薄钢板和等于或大于0.22质量％至0.55质量％的碳当量Ceq，并且其中熔核 （3）形成在薄钢板（1A，1B）的界面中。 在熔核外层区域中，微结构由枝晶结构构成，其中臂间隔的平均值等于或小于12μm，微结构中所含的碳化物的平均粒径为5nm至100nm，并且 碳化物的数密度等于或大于2×10 6 / mm 2。