Chromoum heat-resistant steel excellent in toughness and having high cracking resistance and high creep strength in welded joint
US5116571A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1991 |
| Grant date | May 26, 1992 |
| Priority date | — |
| Expiry date | Jul 12, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/26
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A chromium heat-resistant steel excellent in toughness and having a high cracking resistance and a high creep strength when said steel is utilized to form a welded joint, said steel consisting essentially of: ______________________________________ carbon: from 0.04 to 0.09 wt. %, silicon: from 0.01 to 0.50 wt. %, manganese: from 0.25 to 1.50 wt. %, chromium: from 7.0 to 9.2 wt. %, molybdenum: from 0.50 to 1.50 wt. %, soluble aluminum: from 0.005 to 0.060 wt. %, nitrogen: from 0.001 to 0.060 wt. %, ______________________________________ where, the total amount of nitrogen and carbon being up to 0.13 wt. %, at least one element selected from the group consisting of: ______________________________________ vanadium: from 0.01 to 0.30 wt. %, and niobium: from 0.005 to 0.200 wt. %, ______________________________________ where, the total amount of vanadium and 1.5 times niobium being up to 0.30 wt. %, and the balance being iron and incidental impurities; and the amount of ferrite as represented by the ferrite number (.delta..sub.F) in the above-mentioned chromium heat-resistant steel being -5 or lower, as calculated by the following formula: EQU .delta..sub.F=-104-555 (C+6/7N)+32.9Si-49.5…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.