Optimum Spring manufactures extension, torsion and compression springs with Comparison of Nickel Alloys - Spring Wire Properties
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Comparison of Nickel Alloys - Spring Wire Properties

Nickel-based alloys are especially useful spring materials to combat corrosion and to withstand both elevated and below-zero temperature application. Their nonmagnetic characteristic is important for such devices as gyroscopes, chronoscopes, and indicating instruments. These materials have high electrical resistance and should not be used for conductors of electrical current.


convert to metric units
A 286 Alloy Inconel 600
QQ-W-390
Inconel 718 Inconel X-750
AMS 5698, 5699
Nominal Chemistry
Ni26.0-%
Cr15.0-%
Fe53.0-%
Ni76.0-%
Cr15.8-%
Fe7.2-%
Ni52.5-%
Cr18.6-%
Fe18.5-%
Ni73.0-%
Cr15.0-%
Fe6.75-%
Minimum Tensile Strength
psi x 103
160-200 100-230 210-250 No.IT 155 min.
Spg.T 190-230
E - Modulus of Elasticity
psi x 106
29 31 29 31
Design Stress % Minimum Tensile 35 40 40 40
G - Modulus in Torsion
psi x 106
10.4 11.0 11.2 12
Maximum Operating Temperature
°F
950 700 1100 750-1100
Rockwell Hardness C35-42 C35-45 C45-50 C34-39
C42-48
Density
lb/in3
0.286 0.306 0.296 0.299
Shear Modulus
c GPa
Method of Manufacture
Chief Uses
Special Properties
Cold drawn and precipitation hardened after fabrication. Good corrosion resistance at elevated temperature. Cold drawn. Good corrosion resistance at elevated temperature. Cold drawn and precipitation hardened after fabrication. Good corrosion resistance at elevated temperature. INCONEL X-750 is a non-magnetic nickel-chromium alloy similar to INCONEL 600 but made precipitation hardenable by additions of aluminum and titanium. The alloy has good resistance to corrosion along with high tensile and creep-rupture properties at temperatures to about 1100°F (700°C). It is widely used for high temperature conditions but is not as strong as Nimonic 90. INCONEL X-750 has excellent resistance to chloride ion stress-corrosion cracking. The alloy has similar corrosion resistance to INCONEL 600 in many media. This material is not suited for extension springs requiring initial tension.
Common Trade Names
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