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US 12,448,673 B2Granted
Austenitic stainless alloy with superior corrosion resistance
AssigneeChemetics Inc.
InventorGrant Harding
Life of this patent
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Abstract
Austenitic stainless alloys have been discovered that exhibit unexpectedly superior corrosion resistance, particularly to sulfuric acid solutions, when compared to that exhibited by conventional alloys with closely related compositions. These alloys advantageously are corrosion resistant to a relatively wide range of sulfuric acid concentration and temperature and are thus particularly suitable for use in the industrial production of sulfuric acid.
Claims6
An austenitic stainless alloy comprising the following composition in weight %:
- 36-40% chromium;
- 32.5-36% nickel;
- 1.55-1.75% manganese;
- 0.37-0.48% nitrogen;
- 0.03-0.43% silicon;
- <0.02% carbon;
- <0.02% phosphorus;
- <0.04% molybdenum;
- <0.02% copper;
- <0.005% sulfur;
- and
- remainder consisting essentially of iron.
9 more elements
An austenitic stainless alloy comprising the following composition in weight %:
- 36.01-38.93% chromium;
- 32.95-35.4% nickel;
- 1.62-1.70% manganese;
- 0.42-0.43% nitrogen;
- 0.03-0.43% silicon;
- <0.02% carbon;
- <0.02% phosphorus;
- ≤0.03% molybdenum;
- <0.02% copper;
- <0.005% sulfur;
- and
- remainder consisting essentially of iron.
9 more elements
Dependencies are inferred from the claim text.