Low-temperature steel plate having excellent impact toughness, and method for manufacturing same
US11434557B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 2018 |
| Grant date | Sep 6, 2022 |
| Priority date | — |
| Expiry date | Jun 26, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/008
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Provided are a low-temperature steel plate having excellent impact toughness, and a method for manufacturing same, the low-temperature steel plate comprising, in wt %, 0.02-0.08% C, 6.0-7.5% Ni, 0.5-0.9% Mn, 0.03-0.15% Si, 0.02-0.3% Mo, and 0.1-0.3% Cr, and 50 ppm or less of P, 10 ppm or less of S, and the remainder in Fe and various unavoidable impurities, and the microstructure at ¼t (t: thickness of the steel plate) location of the steel plate comprising, in % surface area, 10-35% tempered bainite, 3-15% residual austenite, and the remainder in tempered martensite, and having granularity of 10 μm or less of high angle grain boundaries at 15° or greater as measured by Electron Backscatter Diffraction (EBSD).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.