公开(公告)号：US20250060054A1

公开(公告)日：2025-02-20

申请号：US18722239

申请日：2022-12-20

Applicant: POSCO Co., Ltd

Inventor： Sang-Chul LEE

IPC: F16L9/02 ,  B23K31/02 ,  B23K101/04 ,  C22C38/02 ,  C22C38/38

Abstract: According to aspects of the present invention, provided are a welded steel tube and a manufacturing method for the same which can provide excellent wear resistance and also minimize hot cracking of the welded portion, so a lifespan thereof may be effectively maximized even when applied in harsh wear-resistant environments.

公开(公告)号：US20250073824A1

公开(公告)日：2025-03-06

申请号：US18722253

申请日：2022-12-20

Applicant: POSCO CO., LTD

Inventor： Sang-Chul LEE

IPC: B23K31/02

Abstract: An aspect of the present invention may provide a method for manufacturing a welded steel pipe having superior wear resistance and low-temperature toughness. And, the present invention may also provide a method for manufacturing a welded steel pipe having particularly suitable physical properties for delivering the slurry by minimizing occurrence of high-temperature cracks in a welded portion.