Plug and mandrel bar for seamless steel pipe rolling operation for manufacturing seamless steel pipe
US6202463A · kind A · utility
6Cited by
1References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 15, 1999 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Jan 15, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B25/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
This invention provide a plug and a mandrel bar for use in rolling a seamless steel pipe of which life can be substantially improved more than that of the prior art under a severe condition of use always exposed to a high temperature and high load. The entire plug or the mandrel bar or at least the surface layer of the extremity end and the work section of it is made of ceramics. In addition, this invention provides a method for manufacturing a seamless steel pipe using such a plug or mandrel bar as described above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.