Method for producing high alloy pipe
US8312751B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2011 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Jun 6, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21B21/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing a high alloy pipe having a minimum yield strength of 758.3 to 965.2 MPa, comprising: preparing a high alloy pipe having controlled amounts of C, Si, Mn, Ni, Cr, Mo, Cu, and N, the balance being Fe and impurities by a hot working or further by a solid-solution heat treatment; and then subsequently subjecting the high alloy pipe to a cold rolling. The cold rolling is performed such that the working ratio Rd, in terms of the reduction of area, in the final cold rolling step falls within a range of larger than 30% and equal to or less than 80%, and the following formula is satisfied: Rd(%)>(MYS−520)/3.1−(Cr+6×Mo+300×N) wherein Rd and MYS signify the working ratio (%) in terms of the reduction of area and the targeted yield strength (MPa), respectively, and Cr, Mo and N signify the mass % of the individual elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.