-
公开(公告)号：EP3932576A1
公开(公告)日：2022-01-05
申请号：EP20762937.9
申请日：2020-02-21
IPC分类号： B21D3/16 , B21D41/02 , B21D26/041 , B21D26/043
摘要： Provided are a metal pipe that has a high dimensional accuracy and that has 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 metal pipe without requiring cutting of pipe end portions after expansion.
The method for manufacturing the metal pipe includes a pipe-end-portion expansion step of expanding pipe end portions 11 that are located at both ends of a mother pipe 1 and an internal pressure application step that is performed after the pipe-end-portion expansion step and in which the mother pipe 1 is expanded by applying an internal pressure, p, to the entire interior of the mother pipe 1 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 12 which are the both ends of the mother pipe 1, becomes a preset maximum internal pressure pmax (MPa), and p and s satisfy the following Formula (2). 0.5 × p / pmax × a / 200 × L 0 ≤ s ≤ p / pmax × a / 200 × L 0 where a stands for a preset expansion ratio (%) satisfying 0.30 ≤ a ≤ 5.0, and L 0 stands for an average length (mm) of the mother pipe.-
公开(公告)号：EP3511082A1
公开(公告)日：2019-07-17
申请号：EP17848663.5
申请日：2017-08-31
摘要： 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.
-
公开(公告)号：EP3511082B1
公开(公告)日：2020-11-18
申请号：EP17848663.5
申请日：2017-08-31
IPC分类号： B21C37/08 , C21D9/08 , C21D9/50 , C22C38/06 , C22C38/38 , C21D6/00 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/14 , C22C38/40 , B21C37/14 , B21B1/22 , B32B15/01 , B23K11/00 , B23K35/38 , F16L9/02 , C22C19/05 , C22C38/00 , F16L9/17 , C22C38/50 , B23K101/34 , B23K101/10 , B23K103/04 , B23K103/18
-
-
搜索结果
3 条记录 (耗时 0.01 秒)
