Chromium-alloyed steel which is corrosion resistant to caustic alkaline solution
US4252561A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1979 |
| Grant date | Feb 24, 1981 |
| Priority date | — |
| Expiry date | Mar 26, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/22
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
One of the difficulties in developing a metallic material which is corrosion resistant to caustic alkaline solutions is that the corrosiveness of these solutions is different depending upon the process for producing the same. The chromium alloyed steel developed according to the present invention, contains, from 29 to 31%, of Cr; not more than 3% of Mo; not more than 0.005% of C; at least one element selected from the group of Nb and Ta in an amount, which follows the equation EQU 20.times.C(%).ltoreq.Nb(%)+0.5.times.Ta(%).ltoreq.60.times.C(%); from 0.0005 to 0.02% of Ca and; not more than 0.02% of deoxidation products being present in said chromium alloyed steel and essentially composed of CaO, SiO.sub.2 and Al.sub.2 O.sub.3. Because of the combination of the reduction of C, N and the impurities of the steel with the addition of Nb and/or Ta, the corrosion resistance of the chromium steel is excellent with regard to the caustic alkaline solution produced by every kind of processes. This excellent corrosion resistance is not essentially degraded by the welding of the chromium steel pieces and, further, the ductility and workability of the chromium steel are improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.