Ultra-fine grain steel and method for producing it
US6221178A · kind A · utility
9Cited by
1References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1998 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Sep 21, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/009
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention provides an ultra-fine grain steel comprising fine ferrite grains as oriented at random and surrounded by large angle grain boundaries. The steel comprises fine ferrite grains having a mean grain size of not larger and 3.0 .mu.m and surrounded by large angle grain boundaries having an misorientation not smaller than 15.degree..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.