Inconel Wire Spring
Inconel® alloy X750
UNS N07750
W.Nr 2.4669
Applications
Springs operating from cryogenic temperatures up to 1300°F (704°C), fasteners and components requiring resistance to high temperature and corrosive environments.
Description
Inconel® X750 is a precipitation hardenable Nickel-Chromium alloy with high strength at temperatures up to 1300°F (704°C) and oxidation resistance up to 1800°F (982°C). Inconel® X750 offers excellent resistance to relaxation and as a result it is widely used for springs operating at elevated temperatures.
Key Features
Good creep rupture strength at high temperatures
Not as strong as Nimonic 90
Very good at cryogenic temperatures
Age hardenable
High temperature dynamic applications
Industries Supplied
Oil & Gas Extraction and Processing, Nuclear, Aerospace, Power Generation and Automotive
Nominal Composition
Ni: 70.0 min
Cr: 14.0 - 17.0
Fe: 5.0 - 9.0
Ti: 2.25 - 2.75
Al: 0.40 - 1.0
Cb (Nb): 0.70 - 1.20
Mn: 1.0
Si: 0.50 max
C: 0.08 max
S: 0.01 max
Cu: 0.5 max
Physical Properties
Density: 0.299 lb/in3, (8.28 g/cm3)
Modulus of Elasticity (E):
At 70°F (20°C): 31.0 x 106 psi (214 GPa)
At 1000°F (538°C): 26.7 x 106 psi (184 GPa)
Modulus of Rigidity (G):
At 70°F (20°C): 12.0 x 106 psi (82.7 GPa)
Coefficient of Expansion:
7.8 µin/in.-°F (70°F to 1000°F)
14.5 µm/m-°C (20°C to 538°C)
Electrical Resistivity: 20.1 µΩ.in, (122 µΩ.cm)
Thermal Conductivity: 83 Btu-in/ft2hr-°F, (12.0 W/m-K)
Applicable Specifications
Wire & Bar: AMS 5698, AMS 5699, AMS 5778, NACE MR0175 (ISO 15156-3), ASTM B637, AMS 5667, AMS 5668, AMS 5670
Typical Mechanical Properties – Spring Applications
- Annealed
- Heat Treatment: 2000 - 2200°F (1093 - 1204°C)
- Tensile Strength: 130 ksi max; (896 MPa) max
- No.1 Temper
- Heat Treatment: As supplied condition.
- Tensile Strength: 130 – 165 ksi; (896 – 1138 MPa)
- No.1 Temper + Aged
- Heat Treatment: After spring coiling. Age: 1350°F (732°C) for 16 hours.
- Tensile Strength: 165 - 220 ksi (1138 - 1517 MPa)
- Suggested Operating Conditions: Optimum resistance to relaxation at temperatures up to 1000°F (538°C) with moderate or low stresses.
- Spring Temper
- Heat Treatment: As supplied condition.
- Tensile Strength: 160 - 220 ksi; (1103 - 1517 MPa)
- Spring Temper + Aged
- Heat Treatment: After spring coiling. Age: 1200°F (649°C) for 4 hours.
- Tensile Strength: 180 - 250 ksi; (1241-1793 MPa)
- Suggested Operating Conditions: Optimum stress and low relaxation at temperatures up to 700°F (371°C)
- Spring Temper + Solution + Aged (3 Step Heat treatment)
- Heat Treatment: After spring coiling. Solution Heat Treat: 2100°F (1149°C) for 2 hours and air cool. Age Harden at 1550°F (843°C) for 24 hours and air cool. Reheat to 1300°F(704°C) for 20 hours and air cool.
- Tensile Strength: 145 - 190 ksi; (1000-1310 MPa)
- Suggested Operating Conditions: Optimum resistance to relaxation at temperatures in the range 1000 – 1300°F (538 – 704°C).
Inconel® alloy 718
UNS N07718
W.Nr 2.4668
Applications
Springs, valves, and aircraft and land-based turbine engines.
Description
Inconel® 718 is an age-hardenable Nickel-Chromium-Columbium (Niobium)-Molybdenum alloy with high strength, corrosion-resistance, and good fabrication characteristics. Inconel® 718 has high tensile, yield, and creep-rupture properties at high temperatures and can operate at cryogenic temperatures up to 1200°F (650°C).
Key Features
Good creep rupture strength at high temperatures
Higher strength than Inconel X-750
Better mechanical properties at lower temperatures than Nimonic 90 & Inconel X-750
Age hardenable
High temperature dynamic applications.
Industries Supplied
Oil & Gas Extraction, Nuclear, Aerospace, Defense and Automotive.
Nominal Composition
Ni: 50.0 - 55.0
Cr: 17.0 - 21.0
Cb (Nb): 4.75 - 5.5
Mo: 2.8 - 3.3
Ti: 0.65 - 1.15
Fe: balance
Co: 1.0 max
Al: 0.2 - 0.8
Mn: 0.35 max
Si: 0.35 max
Cu: 0.3 max
Physical Properties
Density: 0.296 lb/in3, (8.19 g/cm3)
Modulus of Elasticity (E):
At 70°F (20°C): 29.0 x 103 ksi (200 GPa)
Modulus of Rigidity (G):
At 70°F (20°C): 11.6 x 103 ksi (80 GPa)
Coefficient of Expansion:
7.7 µin/in.-°F (70°F to 600°F)
13.9 µm/m-°C (20°C to 300°C)
Electrical Resistivity: 47.5 µΩ.in, (121 µΩ.cm)
Thermal Conductivity: 79 Btu-in/ft2hr-°F, (11.4 W/m-K)
Applicable Specifications
Wire & Bar: AMS 5662, AMS 5663, AMS 5664, AMS 5832, AMS 5962, ASME SB-637, ASTM B637, AWS A5.14, NACE MR0175 (ISO 15156-3).
Typical Mechanical Properties – Spring Applications
- Annealed
- Heat Treatment: 1800°F (980°C)
- Tensile Strength: 115 - 145 ksi; (790-1000 MPa)
- Suggested Operating Conditions: -330°F to 1200°F (-200°C to 650°C)
- Spring Temper
- Tensile Strength: 190 – 220 ksi; (1310 – 1515 MPa)
- Suggested Operating Conditions: -330°F to 1200°F (-200°C to 650°C)
- Spring Temper + Aged
- Heat Treatment: After spring coiling. Age: 1325°F (720°C) for 8 hours, furnace cool to 1150°F and hold for a total aging time of 18 hours.
- Tensile Strength: 220 ksi minimum; (1515 MPa)
- Suggested Operating Conditions: -330°F to 1200°F (-200°C to 650°C)
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