Why Inconel 718 for Springs
Conventional spring steels rapidly lose their load-bearing capability at temperatures above 500°F due to stress relaxation—the gradual loss of spring force under sustained deflection at elevated temperature. Inconel 718 maintains excellent relaxation resistance up to 1,300°F, making it the standard material for springs in gas turbines, nuclear reactors, and high-temperature industrial equipment. The alloy's precipitation-hardened microstructure resists dislocation motion at elevated temperatures, which is the fundamental mechanism behind stress relaxation in metallic springs.
Types of Springs We Produce
CastAlloy manufactures Inconel 718 springs from wire, bar, and strip stock through CNC coiling, machining, and forming operations. Our capabilities include compression springs for turbine seal assemblies and fuel nozzle retention, Belleville (disc) springs for bolted joint preload maintenance at temperature, wave springs for compact high-temperature assemblies, bellows and expansion joints for accommodating thermal growth in piping systems, torsion springs for actuator mechanisms, and custom spring configurations designed to customer specifications. All springs are heat treated to achieve full aged properties and shot peened to maximize fatigue life.
Quality and Testing
Spring performance is verified through load testing at room and elevated temperatures, free height and rate measurements, fatigue testing per customer-specified cycles, dimensional inspection, and material property verification. We provide full material certifications and test documentation with every order. Contact CastAlloy to discuss your high-temperature spring requirements.