WIRE - Nimonic^® Alloy 90

Applications

Springs operating from ambient temperatures up to 1112°F (600°C), fasteners and components requiring resistance to high temperature and corrosive environments.

Industries Supplied

Oil & Gas Extraction and Processing, Nuclear, Aerospace, Power Generation and Automotive.

Nominal Composition

Ni: balance
Cr: 18.0 – 21.0
Co: 15.0 – 21.0
Fe: 3.0 max
Ti: 1.8 – 3.0
Al: 0.8 – 2.0
Mn: 1.0 max
Si: 1.5 max
C: 0.13 max

Physical Properties

Density:
0.296 lb/in³, (8.18 g/cm³)

Modulus of Elasticity (E):
At 70°F (20°C): 32.0 x 106 psi (220 GPa)
At 1000°F (538°C): 27.0 x 106 psi (185 GPa)

Modulus of Rigidity (G):
At 70°F (20°C): 11.9 x 10³ psi (82.0 Gpa)

Coefficient of Expansion:
8.2 µin/in.-°F (70°F to 1000°F)
14.8 µm/m-°C (20°C to 538°C)

Electrical Resistivity:
46.5 µΩ.in, (118 µΩ.cm)

Thermal Conductivity:
80 Btu-in/ft²hr-°F, (11.5 W/m-K)

Typical Mechanical Properties – Spring Applications

Solution Treated

• Heat Treatment: 1922 – 2012°F (1050 – 1100°C) + WQ
• Tensile Strength: 157 ksi max; (1080 MPa) max

Spring Temper

• Heat Treatment: As supplied condition.
• Tensile Strength: 189 – 223 ksi; (1300-1540 MPa)

Spring Temper + Aged

• Heat Treatment: After spring coiling. Age: 1202°F (650°C) for 4 hours. Alternatively, Age at 1112°F(600°C) for 16 hours and air cool.
• Tensile Strength: 189 – 260 ksi; (1300 – 1800 MPa)
• Suggested Operating Conditions: Optimum stress and low relaxation at temperatures up to 700°F (371°C)

Solution Treated + Aged

• Heat Treatment: After spring coiling: Solution Heat Treat: 1976°F (1080°C) followed by rapid cooling + Age at 1382°F (750°C​) for 4 hours and air cool. Alternatively, Age at 1292°F (700°C) for 16 hours and air cool
• Tensile Strength: 145 – 203 ksi; (1080 – 1400 MPa)
• Suggested Operating Conditions: Optimum resistance to relaxation at temperatures up to 1112°F (600°C)