Incoloy 825^* Specification
*Trade name of Special Metals Group of Companies

Incoloy 825 is a Nickel-Iron-Chromium alloy with additions of Molybdenum and Copper. It has excellent resistance to both reducing and oxidising acids, to stress-corrosion cracking and to localised pitting and crevice corrosion. It is also especially resistant to sulphuric and phosphoric acids.

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

Approximate Chemical Composition
Ni	38 - 46%
Fe	22% min
Cr	19.5 - 23.5%
Mo	2.5 - 3.5%
Cu	1.5 - 3%
Ti	0.6 - 1.2%

Properties
DENSITY	8.14 g/cm3	0.294 lb/in3
MELTING POINT	1400oC	2550oF
COEFFICIENT OF EXPANSION	14.0 µm/m °C (20 - 100°C)	7.8 x 10-6 in/in °F (70 - 212°F)
MODULUS OF RIGIDITY	75.9 kN/mm2	11009 ksi
MODULUS OF ELASTICITY	196 kN/mm2	28428 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	-100 to +250oC	-145 to +480oF
Spring Temper	800 - 1100 N/mm2	116 - 159 ksi	-100 to +250oC	-145 to +480oF