Ultra-thick steel excellent in brittle crack arrestability and manufacturing method therefor
US12338515B2 · kind B2 · utility
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Key dates
| Filing date | Nov 29, 2019 |
| Grant date | Jun 24, 2025 |
| Priority date | — |
| Expiry date | Feb 20, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An ultra-thick steel excellent in brittle crack arrestability according to an aspect of the present invention comprises, by weight, C: 0.02-0.07%, Mn: 1.8-2.2%, Ni: 0.7-1.2%, Nb: 0.005-0.02%, Ti: 0.005-0.02%, Cu: 0.1-0.4%, P: 0.01% or less, S: 0.004% or less, and the balance of Fe and inevitable impurities, wherein crystal grains that have a high angle grain boundary of 15 degrees or more, as measured by EBSD, may have an average grain size of 15 μm or less in the t/4−(3*t)/8 region (wherein t represents a thickness of the steel, the same below).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.