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Incoloy 800H/800HT
Incoloy 800, 800H, and 800HT are nickel-iron-chromium alloys with good strength and excellent resistance to oxidation and carburization in high-temperature exposure. These nickel steel alloys are identical except for the higher level of carbon in alloy 800H, and the addition of up to 1.20 percent aluminum and titanium in alloy 800HT. Incoloy 800 was the first of these alloys and it was slightly modified into Incoloy 800H.
Product Description
| INCOLOY® - Technical Specification Table | |
| Parameter / Category | Description & Common Specifications |
| Material Grades | INCOLOY 800 (UNS N08800) INCOLOY 800H (UNS N08810) INCOLOY 800HT (UNS N08811) INCOLOY 825 (UNS N08825) INCOLOY 925 (UNS N09925) INCOLOY 020 (UNS N08020) |
| Standard Specifications | ASTM 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 Available | Plate • Sheet • Strip • Bar • Rod • Wire • Pipe • Tube • Fittings • Forgings • Fasteners • Welding Products |
| Surface Finish | Hot 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 Range | Plate: 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 Characteristics | High 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 |
| Applications | Heat 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 Features | Temperature 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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