公开(公告)号：CA3123534A1

公开(公告)日：2020-06-25

申请号：CA3123534

申请日：2019-09-18

Applicant: JFE STEEL CORP

Inventor： ARATANI MASATOSHI ,  MATSUI RYOJI ,  KONDOU TOMONORI

IPC: C22C38/00 ,  C21D8/10 ,  C21D9/08 ,  C21D9/50 ,  C22C38/38 ,  C22C38/58

Abstract: Provided is an electric resistance welded steel pipe in which, despite a carbon content of 0.40% or more, quenching cracks do not occur and which also has excellent fatigue strength. The electric resistance welded steel pipe has a component composition consisting of, in mass%, C: 0.40-0.55%, Si: 0.10-1.0%, Mn: 0.10-2.0%, P: 0.10% or less, S: 0.010% or less, Al: 0.010-0.100%, Cr: 0.05-0.30%, Ti: 0.010-0.050%, B: 0.0005-0.0030%, Ca: 0.0001-0.0050%, and N: 0.0005-0.0050%, the balance being Fe and unavoidable impurities, and the outer surface and the inner surface have ferrite decarburized layers of 20-50 µm depth from the surface.

公开(公告)号：CA3133451A1

公开(公告)日：2020-09-24

申请号：CA3133451

申请日：2020-02-12

Applicant: JFE STEEL CORP

Inventor： MATSUI RYOJI ,  ARATANI MASATOSHI ,  KONDOU TOMONORI

IPC: C22C38/00 ,  C21D8/10 ,  C21D9/08 ,  C21D9/50 ,  C22C38/14 ,  C22C38/16

Abstract: Provided is an electric resistance welded steel pipe for hollow stabilizers, which has excellent corrosion fatigue resistance properties. An electric resistance welded steel pipe for hollow stabilizers, which has a component composition comprising, in % by mass, 0.15% or more and less than 0.20% of C, 0.1 to 1.0% of Si, 0.1 to 2.0% of Mn, 0.1% or less of P, 0.01% or less of S, 0.01 to 0.10% of Al, more than 0.05% and 0.1% or less of Ti, 0.0005 to 0.005% of B, 0.0001 to 0.0050% of Ca, 0.0050% or less of N and a remainder made up by Fe and unavoidable impurities, and has such a structure that the cleanliness level is 0 to 0.1% as determined with respect to each of TiS grains each having a grain diameter of 10 µm or more and MnS grains each having a grain diameter of 10 µm or more by a point counting method in accordance with JIS G 0555.

公开(公告)号：CA3139909A1

公开(公告)日：2020-11-19

申请号：CA3139909

申请日：2020-05-12

Applicant: JFE STEEL CORP

Inventor： ARATANI MASATOSHI ,  ISHIKAWA KAZUTOSHI ,  MATSUI RYOJI ,  KONDOU TOMONORI

IPC: C21D8/10 ,  C22C38/00 ,  C22C38/38 ,  C22C38/60

Abstract: Provided is an electric-resistance-welded steel pipe for a hollow stabilizer, which makes it possible to suppress the generation of not only a ferrite decarburization layer but also a total decarburization layer even when heat treatment is performed in the atmosphere and to obtain a hollow stabilizer having excellent fatigue characteristics. The electric-resistance-welded steel pipe for a hollow stabilizer has a prescribed component composition, and the total decarburization depths on the inner surface and the outer surface thereof are 100 µm or less.

公开(公告)号：JP2012030270A

公开(公告)日：2012-02-16

申请号：JP2010173873

申请日：2010-08-02

Applicant: Jfe Steel Corp ,  Jfeスチール株式会社

Inventor： YORIFUJI AKIRA ,  NAGAHAMA TAKUYA ,  MATSUI RYOJI

IPC: B21C37/15 ,  B21B23/00 ,  C21D8/10

Abstract: PROBLEM TO BE SOLVED: To reduce variation in the structure and mechanical characteristics of a metal tube in the circumferential direction when manufacturing a metal tube having an uneven pipe wall thickness in the circumferential direction.SOLUTION: When a metal tube with an uneven wall thickness in the circumferential direction is manufactured from a source metal tube having an even wall thickness in the circumferential direction, the source metal tube is heated entirely in the circumferential direction to a warm temperature region or a hot temperature region, and then, also heated partially at a specific portion in the circumferential direction. A diameter reduction rolling is then carried out after the temperature distribution is applied in the circumferential direction of the source metal tube.

Abstract translation: 要解决的问题：在制造在圆周方向上具有不均匀的管壁厚度的金属管时，减小金属管在圆周方向上的结构和机械特性的变化。 解决方案：当在圆周方向上具有均匀壁厚的源金属管制造在圆周方向上具有不均匀壁厚的金属管时，源金属管在圆周方向上被完全加热到暖温度 区域或热温度区域，然后在圆周方向上的特定部分也被部分加热。 然后在源极金属管的圆周方向上施加温度分布后进行直径缩径轧制。 版权所有（C）2012，JPO＆INPIT