Available thicknesses for Alloy 825
| 3/16" | 1/4" | 3/8" | 1/2" | 5/8" | 3/4" |
| 4.8mm | 6.3mm | 9.5mm | 12.7mm | 15.9mm | 19mm |
| 1" | 1 1/4" | 1 1/2" | 1 3/4" | 2" | |
| 25.4mm | 31.8mm | 38.1mm | 44.5mm | 50.8mm |
Alloy 825 plates or alloy 825 (USN N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It became advanced to provide superb corrosion resistance in each oxidizing and decreasing environments. The alloy is immune to chloride stress-corrosion cracking and pitting. The addition of titanium stabilizes alloy 825 in opposition to sensitization in the as-welded situation making the alloy immune to inter-granular assault after publicity to temperatures in a range that could sensitize un-stabilized stainless steels. The fabrication of alloy 825 is typical of nickel-base alloys, with cloth being easily formable and weld-able through a spread of techniques.
Applications
• Air Pollution Control
o Scrubbers
• Chemical Processing Equipment
o Acids
o Alkalis
• Food Process Equipment
• Nuclear
o Fuel Reprocessing
Fuel Element Dissolvers
o Waste Handling
• Offshore Oil and Gas Production
o Seawater Heat Exchangers
o Piping Systems
o Sour Gas Components
• Ore Processing
o Copper Refining Equipment
• Petroleum Refining
o Air-cooled Heat Exchangers
• Steel Pickling Equipment
o Heating Coils
o Tanks
o Crates
o Baskets
• Waste Disposal
o Injection Well Piping Systems
Standards
ASTM..................B 424
ASME..................SB 424
Chemical Analysis
Typical Values (Weight %)
| Nickel | 38.0 min.–46.0 max. | Iron | 22.0 min. |
| Chromium | 19.5 min.–23.5 max. | Molybdenum | 2.5 min.–3.5 max. |
| Molybdenum | 8.0 min.-10.0 max. | Copper | 1.5 min.–3.0 max. |
| Titanium | 0.6 min.–1.2 max. | Carbon | 0.05 max. |
| Niobium (plus Tantalum) | 3.15 min.-4.15 max. | Titanium | 0.40 |
| Carbon | 0.10 | Manganese | 1.00 max. |
| Sulfur | 0.03 max. | Silicon | 0.5 max. |
| Aluminium | 0.2 max. |
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