Ferritic stainless steel exhibiting excellent atmospheric corrosion resistance and crevice corrosion resistance
US5413754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1994 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | May 13, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/18
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A ferritic stainless steel exhibiting excellent atmospheric corrosion resistance and crevice corrosion resistance can be provided by positively adding P thereto and by adequately adjusting Ca and Al. The ferritic stainless steel according to the present invention essentially consists of, in weight percentages, PA0 C: about 0.05% or less PA0 Si: about 1.0% or less PA0 Cr: about 11% or more and less than about 20% PA0 Mn: about 1.0% or less PA0 N: about 0.10% or less PA0 S: about 0.03% or less PA0 Ca: about 5 ppm or more and about 50 ppm or less PA0 Al: about 0.5% or less PA0 P: more than about 0.04% and about 0.20% or less and the balance being iron and incidental impurities. The stainless steel according to the present invention may also contain at least one element selected from a group (1) consisting of about 6% or less of Mo, group (2) consisting of about 1.0% or less of Cu, about 3% or less of Ni and about 3% or less of Co, or group (3) consisting of about 1.0% or less of Ti, about 1.0% or less of Nb, about 1.0% or less of V, about 1.0% or less of W, about 1.0% or less of Zr, about 1.0% or less of Ta and about 0.05% or less of B.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.