Description of Incoloy 825 Tube
Incoloy 825 is an austenitic nickel–iron–chromium alloy with additions of copper, molybdenum and titanium. The nickel content renders the alloy resistant to chloride stress corrosion cracking. The inclusion of molybdenum and copper improves the corrosion resistance in reducing environments compared with other austenitic stainless steels. Chromium and molybdenum enhance the alloy’s resistance to chloride pitting and oxidising atmospheres. Titanium stabilises the alloy against sensitisation in the welded condition. These compositions impart Incoloy 825 resistance to stress corrosion cracking and high resistance to pitting in most environments, except strongly oxidising chloride solutions.
Due to its corrosion resistance, Incoloy 825 is used in several industries, for example in chemical processing, environmental protection, oil and gas exploration and nuclear fuel reprocessing.
Other Trade Names: Alloy 825, UNS N08825, Inconel 825, Nicrofer 4221
Specifications of Incoloy 825 Tube
Density
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8.14 g/cm³
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Specific Heat Capacity
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440 J/kg-°K
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Modulus of Elasticity
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196 MPa (38°C)
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Magnetic Permeability
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1.005 Oersted (μ at 200H)
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Thermal Conductivity
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11.3 W/m-°K (26°C)
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Melting Range
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1370 – 1400°C
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Electrical Resistivity
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1.13 µ cm (26°C)
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Chemical Analysis (%)
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C
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0.05 max.
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Mn
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1.0 max.
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S
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0.03 max
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Si
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0.5 max
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Cr
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19.5 – 23.5
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Ni
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38.0 – 46.0
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Mo
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2.5 – 3.5
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Cu
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1.5 – 3.0
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Ti
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0.6 – 1.2
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Al
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0.2 max.
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Fe
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22.0 min
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Standards for Incoloy 825 Tubes
Rods, Bars, Wire and Forgings
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Plates, Sheets and Strips
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Tubes and Hoses
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BS 3076NA16 ASTM B 425 ASTM B 564 ASME SB 425 ASME SB 564 ASME Code Fall N-572 DIN 17752 DIN 17753 DIN 17754 VdTÜV 432 ISO 9723 ISO 9724 ISO 9725
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BS 3072NA16 BS 3073NA16 ASTM B 424 ASTM B 906 ASME SB 424 ASME SB 906 DIN 17750 VdTÜV 432 ISO 6208
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BS 3074NA16 ASTM B 163 ASTM B 423 ASTM B 704 ASTM B 705 ASTM B 751 ASTM B 775 ASTM B 829 ASME SB 163 ASME SB 423 ASME SB 704 ASME SB 705 ASME SB 751 ASME SB 775 ASME SB 829 ASME Code Gehäuse 1936 DIN 17751 VdTÜV 432 ISO 6207
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Applications of Incoloy 825 Tube
- Chemical processing
- Hot vessels for water used in food processing and sea water
- Equipment for environmental pollution control
- Piping and vessels for sulphuric acid
- Piping for oil and gas drilling
- Nuclear fuel reprocessing
- Production of acids
- Pickling plants
- Handling of radioactive waste
- Calorifiers