Inconel 400 Spring
Neeka Tubes offers a produces high-quality springs, with precision tolerances made from Inconel 718 alloy wire and bar diameters up to 2.50” (65 mm). Our team of engineers can assist you in designing your complex corrosive and low and high-temperature spring applications. Professionally crafted along with our rigid testing standards provides the springs for your toughest applications.
Inconel 718 is an age-hardenable Nickel-Chromium-Columbium (Niobium)-Molybdenum alloy with excellent corrosion resistant properties. It is a high strength alloy that is compatible in both high and low-temperature environments (-423 F – 1300 F) (253 C – 704 C). It exhibits excellent fatigue, creep, and rupture strength making it an ideal alloy for fabricating springs. It is a superior material choice to Inconel X750 at higher temperatures when material strength is a factor.
The alloy retains 75% of its tensile strength up to 1300 F (704 C). Inconel 718 remains ductile in cryogenic environments and is suitable for low-temperature applications like compressed liquid natural gas or CO2 processing. It retains 85% of its ductility at temperatures down to -400 F (-240 C). 718 also performs better than Nimonic 90 at cryogenic temperatures. The material performs well in sour gas environments although there are other nickel alloys such as Inconel 625 and Inconel 725 that perform even better.
Inconel 718 is also resistant to hydrogen embrittlement and stress corrosion cracking with HRc values as high as 40 when in the solution annealed and aged condition. To meet these requirements the NACE MR1075 specifications for heat treatment are followed. The material is typically solution annealed at 1850-1900 F (1010 – 1040 C) and precipitation hardened at 1450 F (780 C) up to 8 hrs.
To meet high fatigue and material strength, heat treatment is conducted by solution annealing at 1700 – 1800 F (925 – 980 C) followed by a rapid cool and precipitation hardening at 1325 F (720 C) for 8 hrs. and furnace cooling to 1150 F (620 C) for 18 hours.
|Technical Specification||Inconel 718|
Ni:50.0 - 55.0
Cb(Nb): 4.75 - 5.5
Mo: 2.8 - 3.3
0.296 lb./in3, (8.19 g/cm3)
|Modulus of Elasticity (E)||
At 70°F (20°C):29.0 x 103 ksi
|Modulus of Rigidity (G)||
At 70°F(20°C): 11.6x103 ksi
|Coefficient of Expansion||
7.7 µin/in.-°F (70°F to 600°F)
47.5 µΩ.in, (121 µΩ.cm)
79 Btu-in/ft2hr-°F, (12.0 W/m-K)
0.002 in (0.0500 mm)
|Uses of Inconel 718 springs||
It has good resistance to oxidation and corrosion at high temperatures. Hence used in atmospheres encountered in jet engines and gas turbine operations.
Inconel 718 is available in a variety of conditions from annealed to spring temper. The most common wires are No. 1 temper and Spring Temper wire for spring making. No 1 temper tensile range is 105 -135 Ksi whereas Spring Temper grade is typically utilized for higher stressed applications with a material tensile capacity as high as 220 Ksi. It should be noted the only way to achieve a higher tensile strength with Inconel 718 is to cold work the material by reducing it from a larger diameter to its final size. Unlike a precipitation hardening alloys like Inconel X750 age-hardening, the material is not possible. Typically, the material is stress relieved for 1 hr. at 850 – 900 F (450 – 480 C) for 1 hr. after coiling.
Inconel springs are useful in applications where other springs may fail. SMSC produces industry-grade Inconel springs that are ideal for extreme environments, and mission-critical applications. These industrial springs are made from Inconel X-750 alloy. We source our materials from reputed dealers, which allows us to provide springs in the unmatched quality.