High tensile strength steel having favorable delayed fracture resistance and method for manufacturing the same
US8357252B2 · kind B2 · utility
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Key dates
| Filing date | Jan 31, 2008 |
| Grant date | Jan 22, 2013 |
| Priority date | — |
| Expiry date | Jul 3, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
High tensile strength steels that have both favorable delayed fracture resistance and a tensile strength of 600 MPa or higher and are suitably used in construction machinery, tanks, penstocks, and pipelines, as well as methods for manufacturing such steels are provided. The safety index of delayed fracture resistance (%) is 100×(X1/X0), where X0: reduction of area of a specimen substantially free from diffusible hydrogen, and X1: reduction of area of a specimen containing diffusible hydrogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.