Incoloy 825(UNS N08825)
Incoloy 825 (UNS N08825) is a ni-fe-cr-mo Ti-stabilized alloy with excellent resistance to sulfuric and phosphoric acids. Resistant to reducing and oxidizing acids, pitting, stress-corrosion cracking and intergranular corrosion, it is used in chemical and petrochemical processing, oil and gas extraction, pollution control, waste processing and pickling applications.
Equivalent Grades
Trademarks | GB | JIS | KS | ASTM | UNS | DIN | W.Nr | GOST | BS | NF |
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Incoloy 825 | GH1140 NS1402 | NCF 825 | NCF 825 | Incoloy 825 | N08825 | NiCr21Mo | 2.4858 | ЭИ602 | NA16 | – |
Product Forms
Wire, Bar, Strip, Sheet, Plate, Tube, Pipe, Pipe Fittings, Forgings
Chemical Composition,%
C | P | S | Mn | Si | Cr | Ni | Mo | Al | Ti | Cu | Fe |
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≤0.05 | ≤0.03 | ≤0.03 | ≤1.00 | ≤0.50 | 19.50~23.50 | 38.00~46.00 | 2.50~3.50 | ≤0.20 | 0.60~1.20 | 1.50~3.00 | ≥22.00 |
Typical Physical & Mechanical Properties (RT, Annealed)
Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | Elongation,% |
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8.14 | 1370-1400 | 690 | 310 | 45 |
Specifications
Rod, Bar, Wire, Forgings | ASTM B425/ASME SB425, ASTM B564/ASME SB564, ISO 9723/9724/9725, DIN 17752/17753/17754 |
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Plate, Sheet, Strip | ASTM B424/B409/B906/ASME SB424/SB409/SB906, ISO 6208 |
Pipe, Tube | ASTM B163/ASME SB163, ASTM B407/B829/ASME SB407/SB829, ASTM B514/B775/ASME SB514/SB775, ASTM B515/B751/ASME SB515/SB751, ISO 6207 |
Others | ASTM B366/ASME SB366(Fittings) |
Features
- Good resistance to stress-corrosion cracking
- Satisfactory resistance to pitting and crevice corrosion
- Good resistance to oxidizing and non-oxidizing hot acids
- Good mechanical properties at both room and elevated temperatures, up to approximately 550℃
- Approval for pressure vessels with wall temperatures up to 450℃
Applications
- Components such as heating coils, tanks, crates, baskets and chains in sulphuric acid pickling plants
- Sea-water-cooled heat exchangers, offshore product piping systems; tubes and components in sour gas service
- Heat exchangers, evaporators, scrubbers, dip pipes etc. in phosphoric acid production
- Air-cooled heat exchangers in petroleum refineries
- Food processing
- Chemical plant