Inconel X750* Specification
*Trade name of Special Metals Group of Companies

  • W.NR 2.4669
  • UNS N07750
  • AWS 014

Applicable Standards:

  • AMS 5667
  • AMS 5699 (Spring Temper)
  • AMS 5698 (No 1 Spring Temper)
  • ASTM B637
  • NACE MR0175 / ISO 15156-3

X750 is a Nickel-Chromium alloy made precipitation hardenable by additions of Al and Ti, having creep-rupture strength at high temperatures to about 700oC (1290oF). It is widely used for high temperature conditions but is not as strong as Nimonic 90.  View X-750 Standard Stock Sizes

Good Mechanical Properties at Elevated Temperatures Yes
Corrosion Resistant at Ambient Temperatures Yes
Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures Yes
Oxidation Resistant Yes
Precipitation Hardenable Yes

Applications include:

  • Nuclear reactors
  • Gas turbines
  • Rocket engines
  • Pressure vessels
  • Aircraft structures
Approximate Chemical Composition
Ni + Co 70% Minimum
Cr 14 - 17%
Fe 5 - 9%
Ti 2.25 - 2.75%
Al 0.4 - 1.0%
Nb + Ta 0.7 - 1.2%
Properties
DENSITY   8.28 g/cm3 0.299 lb/in3
MELTING POINT   1430 oC 2600 oF
COEFFICIENT OF EXPANSION   12.6 µm/m °C
(20 - 100°C)
7.0 x 10-6 in/in °F
(70 - 212°F)
MODULUS OF RIGIDITY   75.8 kN/mm2 10994 ksi
MODULUS OF ELASTICITY  
 ** 
 *** 
218.0 kN/mm2
212.4 kN/mm2
213.7 kN/mm2
31619 ksi
30806 ksi
30995 ksi

*Spring Temper + Aged    **Spring Temper + 3 Part Heat Treated
*** No.1 Spring Temper + Aged

CONDITION OF SUPPLY HEAT TREATMENT (AFTER FORMING)
Spring Temper Age harden at 650oC (1200oF) for 4 hours and air cool.
Spring Temper 3 Part Heat Treatment:
1. Solution Anneal at 1150ºC (2100ºF) for 2 hours and air cool
2. and Stabilise at 843ºC (1550ºF) for 24 hours and air cool
3. and Age harden at 704ºC (1300ºF) for 20 hours and air cool
No 1 Spring Temper Age harden at 730ºC (1350ºF) for 16 hours and air cool

for diameters below 1.00mm contact AWI quality department.

CONDITION APPROX TENSILE STRENGTH APPROX SERVICE TEMPERATURE
Annealed 800 - 1000 N/mm2 116 - 145 ksi    
Spring Temper 1100 - 1500 N/mm2 159 - 217 ksi    
Spring Temper + Aged
1350 - 1750 N/mm2 196 - 254 ksi -200 to +370 ºC -330 up to +700 ºF
Spring Temper + 3 Part heat treated 1100 - 1250 N/mm2 159 - 181 ksi -200 to +550 ºC -330 up to +1020 ºF
No 1 Spring Temper 900 - 1150 N/mm2 130 - 167 ksi    
No 1 Spring Temper + Aged 1300 - 1450 N/mm2 188 - 210 ksi -200 to +550 ºC -330 up to +1020 ºF
Alternatively call us on +44 (0)1384 262022
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