公开(公告)号：US20220168795A1

公开(公告)日：2022-06-02

申请号：US17434659

申请日：2020-02-21

Applicant: JFE STEEL CORPORATION

Inventor： Akihide MATSUMOTO ,  Atsushi MATSUMOTO ,  Shinsuke IDE ,  Takatoshi OKABE

IPC: B21D41/02 ,  B21D26/041 ,  B21D26/043

Abstract: A metal pipe having an outer diameter of 150 mm to 3,000 mm and a wall thickness of 2 mm to 50 mm, and a method for manufacturing the same. The method includes a pipe-end-portion expansion step of expanding pipe end portions that are located at both ends of a mother pipe and an internal pressure application step that is performed after the pipe-end-portion expansion step and in which the mother pipe is expanded by applying an internal pressure, p, to the entire interior of the mother pipe until the internal pressure, p (MPa), that corresponds to changes in an axial compression amount s (mm), the axial compression amount, s, representing an amount of compression in a pipe axial direction against pipe extreme ends which are the both ends of the mother pipe, becomes a preset maximum internal pressure pmax (MPa), and p and s satisfy a specified formula.

公开(公告)号：US20190219218A1

公开(公告)日：2019-07-18

申请号：US16311831

申请日：2017-04-19

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke IDE ,  Atsushi MATSUMOTO ,  Yuji HASHIMOTO ,  Takatoshi OKABE

IPC: F16L58/08 ,  B23K31/02 ,  F16L57/02 ,  F16L9/02

Abstract: An electric-resistance-welded stainless clad steel pipe or tube that is excellent in both the fracture property of the weld and the corrosion resistance of the pipe or tube inner surface as electric resistance welded without additional welding treatment such as weld overlaying after electric resistance welding is provided. An electric-resistance-welded stainless clad steel pipe or tube comprises: an outer layer of carbon steel or low-alloy steel; and an inner layer of austenitic stainless steel having a predetermined chemical composition, wherein a flatness value h/D in a 90° flattening test in accordance with JIS G 3445 is less than 0.3, and a pipe or tube inner surface has no crack in a sulfuric acid-copper sulfate corrosion test in accordance with ASTM A262-13, Practice E, where h is a flattening crack height (mm), and D is a pipe or tube outer diameter (mm).

公开(公告)号：US20190186655A1

公开(公告)日：2019-06-20

申请号：US16331235

申请日：2017-08-31

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke IDE ,  Akihide MATSUMOTO ,  Atsushi MATSUMOTO ,  Takatoshi OKABE

IPC: F16L9/17 ,  B23K11/00 ,  B23K11/02 ,  B23K11/093 ,  B32B1/08 ,  B32B15/01 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D9/08 ,  C22C19/05 ,  C22F1/10

CPC classification number: F16L9/17 ,  B21C37/08 ,  B23K11/0006 ,  B23K11/02 ,  B23K11/0935 ,  B23K13/00 ,  B23K13/06 ,  B23K2101/10 ,  B23K2103/05 ,  B32B1/08 ,  B32B15/011 ,  B32B15/015 ,  B32B2597/00 ,  C21D9/08 ,  C21D9/085 ,  C21D9/50 ,  C22C19/056 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/60 ,  C22F1/00 ,  C22F1/10

Abstract: Provided is an electric resistance welded clad steel pipe or tube in which a region where solidification microstructure is formed, i.e. a region in a weld particularly having significant influence on properties, is reduced without impairing its function as a clad pipe or tube. An electric resistance welded clad steel pipe or tube comprises: a first layer made of carbon steel or low-alloy steel as base metal; and a second layer placed on one surface of the first layer, and made of stainless steel or a nickel-containing alloy as cladding metal, wherein the base metal is not exposed at a cladding metal-side surface of the electric resistance welded clad steel pipe or tube in a weld, and no solidification microstructure is contained in each of circular sections of 0.1 mm in radius respectively centered at specific three positions in a plane perpendicular to a pipe or tube longitudinal direction.

公开(公告)号：US20200224813A1

公开(公告)日：2020-07-16

申请号：US16830268

申请日：2020-03-26

Applicant: JFE STEEL CORPORATION

Inventor： Shinsuke IDE ,  Atsushi MATSUMOTO ,  Yuji HASHIMOTO ,  Takatoshi OKABE

IPC: F16L58/08 ,  B21C37/08 ,  B21C51/00 ,  B23K20/227 ,  B23K11/087 ,  B23K11/34 ,  B23K11/16 ,  B23K20/02 ,  B23K20/04 ,  B23K13/08 ,  C22C38/58 ,  C22C38/44 ,  B23K11/00 ,  F16L9/16 ,  F16L9/18 ,  B23K11/08 ,  B23K13/02 ,  F16L9/17 ,  C22C38/12 ,  C22C38/40 ,  C22C38/20 ,  C22C38/24 ,  C22C38/48 ,  C22C38/22 ,  C22C38/42 ,  C22C38/00 ,  C22C38/18 ,  C22C38/02 ,  C22C38/06 ,  C22C38/26 ,  C22C38/50 ,  C22C38/38 ,  C22C38/08 ,  C22C38/46 ,  C22C38/04 ,  C22C38/14 ,  C22C38/28 ,  C22C38/16 ,  B32B15/04 ,  B32B15/01 ,  B32B15/00 ,  B32B1/08 ,  B32B15/18 ,  B23K31/02 ,  F16L9/02 ,  F16L57/02

Abstract: An electric-resistance-welded stainless clad steel pipe or tube that is excellent in both the fracture property of the weld and the corrosion resistance of the pipe or tube inner surface as electric resistance welded without additional welding treatment such as weld overlaying after electric resistance welding is provided. An electric-resistance-welded stainless clad steel pipe or tube comprises: an outer layer of carbon steel or low-alloy steel; and an inner layer of austenitic stainless steel having a predetermined chemical composition, wherein a flatness value h/D in a 90° flattening test in accordance with JIS G 3445 is less than 0.3, and a pipe or tube inner surface has no crack in a sulfuric acid-copper sulfate corrosion test in accordance with ASTM A262-10, Practice E, where h is a flattening crack height (mm), and D is a pipe or tube outer diameter (mm).

公开(公告)号：US20190184437A1

公开(公告)日：2019-06-20

申请号：US16331222

申请日：2017-08-31

Applicant: JFE STEEL CORPORATION

Inventor： Takatoshi OKABE ,  Atsushi MATSUMOTO ,  Shinsuke IDE ,  Akihide MATSUMOTO

IPC: B21C37/08 ,  B23K13/06 ,  C21D9/08 ,  C21D9/50 ,  C22C38/06 ,  C22C38/38

CPC classification number: B21C37/08 ,  B23K13/00 ,  B23K13/06 ,  C21D9/08 ,  C21D9/50 ,  C22C38/00 ,  C22C38/06 ,  C22C38/38

Abstract: Provided is a clad welded pipe or tube that has improved pipe or tube mechanical properties by reducing the width of a weld without its function as a clad pipe or tube being impaired. A clad welded pipe or tube comprises: a first layer made of base metal; and a second layer placed on one surface of the first layer, and made of first cladding metal that is a material different from the base metal, wherein a pipe or tube circumferential length L1 of weld metal at a pipe or tube inner surface and a pipe or tube circumferential length L2 of the weld metal at a pipe or tube outer surface in a weld are each 0.0010 mm or more and 1.0 mm or less, and the base metal is not exposed at a first cladding metal-side surface of the clad welded pipe or tube in the weld.