Nimonic® 90

Available in any of the 'profile options'

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.

Nimonic® 90 is also known as Superimphy 90, Pyromet 90, and Udimet 90.

Chemical Composition

Specifications

Designations

Key Features

Typical Applications

Element	Min %	Max %
Ni	bal
Cr	18.00	21.00
Fe	–	1.50
Ti	2.00	3.00
Mn	–	1.0
Si	–	1.0
C	–	0.13
Al	1.00	2.00
Co	15.00	21.00
S	–	0.015
Cu	–	0.20
B	–	0.02
Pb	–	0.002
Zr	–	0.15
Ag	–	0.0005
Bi	–	0.0001

AMS 5829
BS HR 501
BS HR 502
BS HR 503
BS 3075 NA 19
ISO 15156
(NACE MR 0175)
NCK 20TA

W.Nr 2.4632
W.Nr 2.4969
UNS N07090
AWS 030

High stress rupture strength and high creep resistance at high temperatures
Good resistance to high-temperature corrosion and oxidation
Age hardenable
High temperature dynamic applications^{^^}

Aerospace fasteners

Density	8.18g/cm³	0.296 lb/in³
Melting Point	1370°C	2500°F
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 (Annealed + Aged) (Spring Temper + Aged)	213 kN/mm² 227 / 240 kN/mm²	30894 ksi 32924 / 34810 ksi

Heat Treatment of Finished Parts
Condition as supplied by Alloy Wire	Type	Temperature		Time (Hr)	Cooling
Condition as supplied by Alloy Wire	Type	°C	°F	Time (Hr)	Cooling
Annealed	Age Harden	750	1380	4	Air
Spring Temper	Age Harden	650	1200	4	Air
Spring Temper	Age Harden	600	1110	16	Air

Properties
Condition	Approx. tensile strength		Approx. operating temperature depending on load^^ and environment
Condition	N/mm²	ksi	°C	°F
Annealed	800 – 1000	116 – 145	–	–
Annealed + Aged	1200 – 1400	174 – 203	up to 550	up to 1020
Spring Temper	1200 – 1500	175 – 218	–	–
Spring Temper + Aged	1500 – 1800	218 – 261	up to 350	up to 660