Nimonic 90^* Specification
*Trade name of Special Metals Group of Companies

A Nickel-Chromium-Cobalt alloy being precipitation hardenable, having high stress-rupture strength and creep resistance at high temperatures up to about 950^oC (1740^oF). It is widely used and a well proven alloy in high temperature conditions.

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

Approximate Chemical Composition
Ni	54%
Cr	18 - 21%
Co	15 - 21%
Ti	2 - 3%
Al	1 - 2%

Properties
DENSITY		8.18 g/cm3	0.296 lb/in3
MELTING POINT		1370oC	2500oF
COEFFICIENT OF EXPANSION		12.7 µm/m °C (20 - 100°C)	7.1 x 10-6 in/in °F (70 - 212°F)
MODULUS OF RIGIDITY		82.5 kN/mm2	11966 ksi
MODULUS OF ELASTICITY	*   **	213 kN/mm2 227 / 240 kN/mm2	30894 ksi 32924 / 34810 ksi

*Spring Temper + Aged    **Spring Temper + 3 Part Heat Treated

CONDITION OF SUPPLY	HEAT TREATMENT (AFTER FORMING)
Solution Annealed	Age harden at 750oC (1380oF) for 4 hours and air cool.
Spring Temper	Age harden at 650oC (1200oF) for 4 hours and air cool.
Spring Temper	Age harden at 600oC (1110oF) for 16 hours and air cool.

CONDITION	APPROX TENSILE STRENGTH		APPROX SERVICE TEMPERATURE
Solution Annealed	800 - 1000 N/mm2	116 - 145 ksi	-	-
Solution Annealed + Aged	1300 - 1400 N/mm2	189 - 203 ksi	up to 550oC	up to 1020oF
Spring Temper	1300 - 1500 N/mm2	189 - 218 ksi	-	-
Spring Temper + Aged	1500 - 1800 N/mm2	218 - 261 ksi	up to 350oC	up to 660oF