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Incoloy 825

Incoloy 825 is a nickel-iron-chromium alloy with additions of molybdenum,  copper and titanium. This nickel steel alloy’s chemical composition is designed  to provide exceptional resistance to many corrosive environments. It is similar  to alloy 800 but has improved resistance to aqueous corrosion. It has excellent  resistance to both reducing and oxidizing acids, to stress-corrosion cracking,  and to localized attack such as pitting and crevice corrosion.
Product Description

INCOLOY® - Technical Specification Table
Parameter / CategoryDescription & Common Specifications
Material GradesINCOLOY 800 (UNS N08800)
INCOLOY 800H (UNS N08810)
INCOLOY 800HT (UNS N08811)
INCOLOY 825 (UNS N08825)
INCOLOY 925 (UNS N09925)
INCOLOY 020 (UNS N08020)
Standard SpecificationsASTM B408: Nickel-Iron-Chromium Alloy Rod and Bar
ASTM B409: Nickel-Iron-Chromium Alloy Plate, Sheet, and Strip
ASTM B407: Nickel-Iron-Chromium Alloy Seamless Pipe and Tube
ASTM B423: Nickel-Iron-Chromium-Molybdenum-Copper Alloy Seamless Pipe and Tube
ASTM B424: Nickel-Iron-Chromium-Molybdenum-Copper Alloy Plate, Sheet, and Strip
ASTM B425: Nickel-Iron-Chromium-Molybdenum-Copper Alloy Rod and Bar
Forms AvailablePlate • Sheet • Strip • Bar • Rod • Wire • Pipe • Tube • Fittings • Forgings • Fasteners • Welding Products
Surface FinishHot Rolled: Annealed and pickled
Cold Rolled: Smooth finish
Polished: Mechanical polished to specified finish
Turned: For bar and rod products
Bright Annealed: Reflective surface
Thickness/Diameter RangePlate: 3mm to 100mm+
Sheet/Strip: 0.5mm to 6mm
Bar/Rod: 3mm to 300mm+
Pipe/Tube: OD 1/8" to 24"+
Wire: 0.5mm to 10mm+
Mechanical Properties (INCOLOY 800H Annealed)Tensile Strength: 450-600 MPa
Yield Strength (0.2% Offset): 170-340 MPa
Elongation: 30-45%
Hardness: 125-185 HB
Modulus of Elasticity: 196 GPa
Chemical Composition (INCOLOY 800H Typical)Nickel: 30-35%
Chromium: 19-23%
Iron: Balance
Carbon: 0.05-0.10%
Aluminum: 0.15-0.60%
Titanium: 0.15-0.60%
Manganese: 1.5% max
Silicon: 1.0% max
Copper: 0.75% max
Key CharacteristicsHigh Temperature Strength: Excellent creep rupture strength
Oxidation Resistance: Good resistance to oxidizing atmospheres
Carburization Resistance: Resists carbon penetration
Good Fabricability: Easy to form and weld
Corrosion Resistance: Good general corrosion resistance
ApplicationsHeat Treating Equipment: Furnace components, retorts, radiant tubes
Chemical Processing: Reactors, heat exchangers, piping
Power Generation: Heat recovery steam generators, boiler components
Nuclear Industry: Heat exchangers, piping systems
Petrochemical: Catalytic reforming systems, transfer piping
Industrial Heating: Heating element sheaths, thermowells
Special FeaturesTemperature Capability: Service up to 1100°C (2000°F)
Stress Rupture Strength: Excellent long-term high temperature strength
Thermal Stability: Maintains properties after prolonged exposure
Weldability: Good welding characteristics
Formability: Can be formed by all conventional methods

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