Inconel X750 Wire

Inconel X-750 - ASTM B 637 Spring Wire Properties

Inconel X-750 is a high temperature nickel alloy that is highly resistant to chemical corrosion and oxidation. It has high stress-rupture strength and low creep rates under high stresses at temperatures up to 1500°F. Alloy X-750 is the most common type of Inconel and is an excellent choice when designing springs and wire forms for extreme temperature environments.

Nominal Chemical and Physical Properties of Inconel X750:

Ni 73%
Cr 15%
Fe 6.75%
Minimum Tensile Strength psi x 103 Number 1 Temper 155 min., Spring Temper 190-230
Design Stress % Minimum Tensile 40
E - Modulus of Elasticity psi x 106 31
G - Modulus in Torsion psi x 106 12
Maximum Operating Temperature 750-1100°F
Rockwell Hardness C34-48

Heat Treating Inconel X750:

Here are two of the most common methods of heat treating Inconel X750:

1. For maximum creep, relaxation and rupture strength at temperatures above 1100°F:
Solution Treatment - 2100°F,
Hold for 2 to 4 hours,
Air-cool to room temperature
Intermediate Age - 1550°F
Hold for 24 hours
Air-cool to room temperature
Final Age -1300°F
Hold for 20 hours
Air-cool to room temperature

2. For highest room temperature yield strength and tensile ductility:
Stress Equalization - 1625°F
Hold for 24 hours
Air -cool to room temperature
Precipitation Age - 1300°F
Hold for 20 hours
Air-cool to room temperature


Inconel X750 is cold drawn and precipitation hardened after fabrication.


Inconel X750 is used to fabricate springs and wire forms that are used in very high temperature applications such as jet engine parts, nuclear power plant applications, heat-treating fixtures, forming tools, and extrusion dies.