Ultra-thick steel material having excellent surface part NRL-DWT properties and method for manufacturing same
US11634784B2 · kind B2 · utility
0Cited by
0References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2017 |
| Grant date | Apr 25, 2023 |
| Priority date | — |
| Expiry date | Nov 3, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2221/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Disclosed are a high-strength ultra-thick steel material and a method for manufacturing same. The high-strength ultra-thick steel material comprises in weight % 0.04-0.1% of C, 1.2-2.0% of Mn, 0.2-0.9% of Ni, 0.005-0.04% of Nb, 0.005-0.03% of Ti and 0.1-0.4% of Cu, 100 ppm or less of P and 40 ppm or less of S with a balance of Fe, and inevitable impurities, and comprises, in a subsurface area up to t/10 (t hereafter being referred to as the thickness of the steel material), polygonal ferrite of 50 area % or greater (including 100 area %) and bainite of 50 area % or less (including 0 area %) as microstructures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.