Nickel-Fe-Cr alloy, INCOLOY 840, annealed
INCOLOY 840, annealed, Designation
| Incoloy alloy 840 |
| Condition | Annealed |
| EN number | 1.4847 |
INCOLOY 840, annealed, Compositional summary
| Fe52-64 / Cr18-22 / Ni18-22 (impurities: Mn<1, Si<1, Cu<0.75, Al<0.6, Ti<0.6, C<0.08, S<0.015) |
| Material family | Metal (non-ferrous) |
| Base material | Fe (Iron) |
INCOLOY 840, annealed, Composition detail
| Al (aluminum) | 0 | – | 0.6 | % |
| C (carbon) | 0 | – | 0.08 | % |
| Cr (chromium) | 18 | – | 22 | % |
| Cu (copper) | 0 | – | 0.75 | % |
| Fe (iron) | 52 | – | 64 | % |
| Mn (manganese) | 0 | – | 1 | % |
| Ni (nickel) | 18 | – | 22 | % |
| S (sulfur) | 0 | – | 0.015 | % |
| Si (silicon) | 0 | – | 1 | % |
| Ti (titanium) | 0 | – | 0.6 | % |
INCOLOY 840, annealed, Physical properties
INCOLOY 840, annealed, Mechanical properties
| Young’s modulus | 192 | – | 201 | GPa |
| Specific stiffness | 24.2 | – | 25.5 | MN.m/kg |
| Yield strength (elastic limit) | 205 | – | 225 | MPa |
| Tensile strength | 539 | – | 597 | MPa |
| Specific strength | 26 | – | 28.4 | kN.m/kg |
| Elongation | 36.7 | – | 45.8 | % strain |
| Compressive strength | 205 | – | 225 | MPa |
| Flexural modulus | 192 | – | 201 | GPa |
| Flexural strength (modulus of rupture) | 205 | – | 225 | MPa |
| Shear modulus | 75 | – | 80 | GPa |
| Poisson’s ratio | 0.259 | – | 0.273 | |
| Shape factor | 30 | | | |
| Hardness – Vickers | 164 | – | 188 | HV |
| Hardness – Rockwell B | 83 | – | 89 | HRB |
| Hardness – Rockwell C | 2 | – | 8 | HRC |
| Hardness – Brinell | 160 | – | 180 | HB |
| Elastic stored energy (springs) | 107 | – | 129 | kJ/m3 |
| Fatigue strength at 10^7 cycles | 268 | | | MPa |
Fatigue strength model (stress range)
Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles | 241 | – | 300 | MPa |
INCOLOY 840, annealed, Impact & fracture properties
| Fracture toughness | 239 | – | 265 | MPa.m0.5 |
| Toughness (G) | 290 | – | 358 | kJ/m2 |
INCOLOY 840, annealed, Thermal properties
| Melting point | 1130 | – | 1160 | °C |
| Maximum service temperature | 787 | – | 987 | °C |
| Minimum service temperature | -273 | | | °C |
| Thermal conductivity | 13.4 | – | 14.6 | W/m.°C |
| Specific heat capacity | 449 | – | 467 | J/kg.°C |
| Thermal expansion coefficient | 12.1 | – | 12.7 | µstrain/°C |
| Thermal shock resistance | 83.2 | – | 93.3 | °C |
| Thermal distortion resistance | 1.08 | – | 1.18 | MW/m |
| Latent heat of fusion | 295 | – | 357 | kJ/kg |
INCOLOY 840, annealed, Electrical properties
| Electrical resistivity | 80 | – | 83.2 | µohm.cm |
| Electrical conductivity | 2.07 | – | 2.16 | %IACS |
| Galvanic potential | -0.25 | – | -0.17 | V |
INCOLOY 840, annealed, Magnetic properties
| Magnetic type | Non-magnetic |
INCOLOY 840, annealed, Optical, aesthetic and acoustic properties
| Transparency | Opaque |
| Acoustic velocity | 4920 | – | 5050 | m/s |
INCOLOY 840, annealed, Processing properties
| Metal casting | Unsuitable |
| Metal cold forming | Acceptable |
| Metal hot forming | Acceptable |
| Metal press forming | Acceptable |
| Metal deep drawing | Unsuitable |
| Machining speed | 14.6 m/min |
Weldability
Notes: Preheating is not required, post weld heat treatment is required | Good |
| Weldability – MIG | Fair |
| Weldability – plasma | Fair |
| Weldability – SAW | Fair |
| Weldability – TIG | Fair |
| Brazeability | Good |
INCOLOY 840, annealed, Durability
| Water (fresh) | Excellent |
| Water (salt) | Excellent |
| Weak acids | Excellent |
| Strong acids | Acceptable |
| Weak alkalis | Excellent |
| Strong alkalis | Excellent |
| Organic solvents | Excellent |
| Oxidation at 500C | Excellent |
| UV radiation (sunlight) | Excellent |
Galling resistance (adhesive wear)
Notes: Bronze or zinc alloy dies should be used to minimize galling. | Limited use |
| Flammability | Non-flammable |
INCOLOY 840, annealed, Corrosion resistance
| Pitting resistance equivalent number (PREN) | 18 – 22 |
| Pitting and crevice corrosion | Medium (20-30) |
| Stress corrosion cracking Note: Rated in chloride; Other susceptible environments: Hydroxide | Slightly susceptible |
| Intergranular (weld line) corrosion | Excellent |
| Inorganic acids | Excellent |
| Organic acids | Excellent |
| Alkalis | Good |
| Humidity / water | Excellent |
| Sea water | Moderate |
| Sour oil and gas | Excellent |
INCOLOY 840, annealed, Standards with similar compositions
| USA: S33400 to ASTM A240/A240M, S33400 to ASTM A959, TP310Cb to ASTM A249/A249M, UNS S33400 |
| Tradenames: FERROTHERM 4847, NAS H840 |
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