Incoloy 800* Specification
*Trade name of Special Metals Group of Companies

  • W.NR 1.4875
  • UNS N08800
  • AWS 020

Applicable Standards:

  • BS 3075 NA15
  • BS 3076 NA15

This Nickel-Iron-Chromium alloy has good strength and excellent resistance to oxidation and carburisation in high temperature atmospheres. Incoloy 800 also resists corrosion in many aqueous environments.

Good Mechanical Properties at Elevated Temperatures No
Corrosion Resistant at Ambient Temperatures Yes
Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures No
Oxidation Resistant Yes
Precipitation Hardenable No

Applications include:

  • Process Piping
  • Heat Exchangers
  • Carburising Equipment
  • Heating Element Sheathing

Approximate Chemical Composition
Ni 30 - 35%
Fe 39.5% min
Cr 19 - 23%
C 0.1% max
Al 0.15 - 0.6%
Ti 0.15 - 0.6%
Properties
DENSITY 7.94 g/cm3 0.287 lb/in3
MELTING POINT 1385 oC 2525 oF
COEFFICIENT OF EXPANSION 14.4 µm/m °C
(20 - 100°C)
7.9 x 10-6 in/in °F
(70 - 212°F)
MODULUS OF RIGIDITY 78.9 kN/mm2 11444 ksi
MODULUS OF ELASTICITY 196.5 kN/mm2 28500 ksi
CONDITION OF SUPPLY HEAT TREATMENT (AFTER FORMING)
Annealed/Spring Temper Stress relieve at 450 - 470oC (840 - 880oF) for 30 - 60 minutes and air cool.
CONDITION APPROX TENSILE STRENGTH APPROX SERVICE TEMPERATURE
Annealed 600 - 800 N/mm2 87 - 116 ksi -200 to +815oC -330 to +1500oF
      (for lightly stressed applications)
Spring Temper 800 - 1100 N/mm2 116 - 159 ksi -200 to +815oC -330 to +1500oF
      (for lightly stressed applications)
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