Method of fabricating high strength and high toughness large-diameter welded steel pipe
US5837956A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1997 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Aug 7, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K2103/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Utilizing a low-oxygen welding flux, and a low carbon welding wire, seam welding is conducted by submerged arc welding so that the resulting weld metal has a chemical composition, in which P.sub.WM value defined as below is in a range of from 0.18 to 0.33, and a micro-structure containing acicular ferrite not less than 55% by area ratio: EQU P.sub.WM =P.sub.cm +3.19Ti-1.020 EQU where, EQU P.sub.cm =C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B Furthermore, when cracking resistance is required, submerged arc welding is conducted such that the chemical composition of the weld metal satisfies P.sub.rh value of less than 2.8, in addition to fulfilling the above conditions: EQU P.sub.cm =C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.