Alloy and multilayer steel tube having corrosion resistance in fuel combustion environment containing V, Na, S and Cl
US5620805A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1995 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Oct 26, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12979
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides a highly corrosion-resistant steel tube for use as a steel tube for boilers, etc., used for installations where fossil fuel or combustible refuse is burnt as an energy source. An alloy which exhibits corrosion resistance in an environment where fuel containing V, Na, S and Cl is burnt, comprising up to 0.05% of C, 1.0 to 2.6% of Si, 0.02 to 0.5% of Mn, 20 to 28% of Cr, 24 to 36% of Ni, up to 4% of Mo, up to 0.4% of Nb, up to 0.05% of Al and the balance Fe and unavoidable impurities, and satisfying the following inequalities: EQU Ni.gtoreq.(Cr+2Si+0.5Mo), EQU Nb.gtoreq.8C, and EQU Mo(Cr-18).gtoreq.8, and a multilayer steel tube comprising said alloy as a liner and a standardized boiler steel tube as a base layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.