Martensitic stainless steel for welded structures
US8163233B2 · kind B2 · utility
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Key dates
| Filing date | Feb 27, 2009 |
| Grant date | Apr 24, 2012 |
| Priority date | — |
| Expiry date | May 23, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/40
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A martensitic stainless steel for welded structures including by mass %, C: 0.001 to 0.05%, Si: 0.05 to 1%, Mn: 0.05 to 2%, P: 0.03% or less, REM: 0.0005 to 0.1%, Cr: 8 to 16%, Ni: 0.1 to 9% and sol. Al: 0.001 to 0.1%; and further including one or more elements selected from among Ti: 0.005 to 0.5%, Zr: 0.005 to 0.5%, Hf: 0.005 to 0.5%, V: 0.005 to 0.5% and Nb: 0.005 to 0.5%; and O: 0.005% or less, N: 0.1% or less, with the balance being Fe and impurities; and the P and REM content satisfies: P≦0.6×REM. This steel possesses excellent SCC (stress corrosion cracking) resistance in welded sections in Sweet environments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.