Hastelloy X750

Hastelloy X750

Nickel (Ni) - 70.0 (+ Cobalt)
Chromium (Cr) - 14.0
Molybdenum (Mo) - 25.0
Iron (Fe) - 5.0
Manganese (Mn) - 1.0
Cobalt (Co) - 1.0
Titanium (Ti) - 2.25
Other

Key

Nickel
Copper
Chromium
Aluminum
Molybdenum
Iron
Titanium
Manganese
Cobalt
Other
  • Nickel (Ni) 70.0 (+ Cobalt)
  • Copper (Cu) 0.5
  • Chromium (Cr) 14.0
  • Aluminum Al 0.4
  • Molybdenum (Mo) 25.0
  • Iron (Fe) 5.0
  • Manganese (Mn) 1.0
  • Cobalt (Co) 1.0
  • Carbon (C) 0.08
  • Silicon (Si) 0.5
  • Niobium (Nb) 0.7 (+ Tantalum)
  • Sulfur (S) 0.01
  • Titanium (Ti) 2.25

UNS N07750

Hastelloy X750 is a precipitation-hardenable nickel-chromium alloy used for its corrosion and oxidation resistance and high strength at temperatures to 1300°F. Although much of the effect of precipitation hardening is lost with increasing temperature over 1300°F, heat-treated material has useful strength up to 1800°F. Hastelloy X750 also has excellent properties down to cryogenic temperatures.

Hastelloy X750 applications include gas turbines, rotor blades, wheels, bolts and other structural components. Hastelloy X750 is also used in rocket-engine thrust chambers. Airframe applications such as thrust reversers and hot-air duct systems. Pressure vessel applications are formed from Hastelloy X750. Other applications are heat-treating fixtures, forming tools, extrusion dies and test machine grips. For springs and fasteners, Hastelloy X750 is used from sub-zero to 1200°F.

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Summary

  • Environment:
    Oxidation Resistant
  • Temperature Limit:
    1300 °F / 704 °C
  • Ultimate Tensile (Typical):
    160 ksi / 1103 mpa

Specifications & Technical Data

If your question isn’t answered below, download the complete technical data sheet here.

Specifications

  • ASTM B637 & ASME SB637
  • Plate, Sheet & Strip: AMS 5542/5598
  • Rod & Bar: AMS 5667
  • W-Nr 2.4669

Physical Constants

Density

0.299 lb/in3
8.28 g/cm3
Melting Range

2540-2600°F
1393-1427°C
Curie Temperature As Hot-Rolled -225°F
Triple-Heat-Treated
(2100°F/2 hr, A.C.,+1500°F /24 hr, A.C., + 1300°F/20 hr, A.C.)
-193°F
Magnetic Permeability (70°F, 200H) As Hot-Rolled 1.0020
Triple-Heat-Treated
(2100°F/2 hr, A.C.,+1500°F /24 hr, A.C., + 1300°F/20 hr, A.C.)
1.0035
Emissivity, Oxidized Surface 600°F 0.895
2000°F 0.925
Linear Contraction during Precipitation Treatment (1300°F/20hr), in/in Hot-Rolled 0.00044
20% Cold-Rolled 0.00052
Annealed 0.00026

 

Thermal Properties
Temperature, °F Mean Linear Expansion, in./in./°F x 10-6 from 70°F to Temperature Shown Thermal Conductivity, Btu/in./hr/sq ft/°F Specific Heat Btu/lb/°F Diffusivity, sq ft/hr Electrical Resistivity, ohm/circ mil/ft
-250 6.5 67 0.073 0.150
-200 6.6 70 0.080 0.143
-100 6.7 74 0.090 0.135
70 83 0.103 0.132 731
200 7.0 89 0.109 0.133 739
400 7.2 98 0.116 0.140 746
600 7.5 109 0.120 0.148 761
800 7.8 120 0.125 0.158 771
1000 8.1 131 0.0.130 0.169 783
1200 8.4 143 0.137 0.173 786
1400 8.8 154 0.151 0.172 775
1600 9.3 164 0.171 0.164 761
1800 9.8

a Material heat-treated 2100°F/3 hr, A.C., + 1550°F/24 hr, A.C., + 1300°F/20 hr, A.C.

Effect of Heat Treatment on Room-Temperature Resistivity of Hot-Rolled Bar
Heat Treatment Resistivity, ohm/circ mil/ft
As hot-rolled 759
2000°F/1 hr, A.C. 763
2100°F/1 hr, A.C.+1500°F/24 hr, A.C.+ 1300°F/20 hr, A.C. 724
1800°F/1 hr, A.C.+1350°F/8 hr,F.C. to 1150°F, hold at 1150°F for total time of 18 hr, A.C. 739

 

Modulus of Elasticity
Temperature, °F Modulus of Elasticity, 103 ksi
Tension Torsion
Static Dynamic Static
80 31.0 31.0 11.0
500 28.7 29.1 10.2
1000 25.0 26.7 9.0
1200 23.0 25.5 8.1
1350 21.0 24.4
1500 18.5 23.2
1600 22.1
1800 20.0

aPoisson’s ratio = 0.29

Mechanical Properties

Minimum Specified Properties
Ultimate Tensile Strength, ksi 120
.02% Yield Strength, ksi 60
Elongation, % 30

 

Typical Mechanical Properties – Bar
Size  Ultimate
Tensile Strength ksi
Yield Strength (0.2% Offset) Ksi Elongation in 4D(%) % Reduction of Area
Under 4.0″ 165.0 105 20 25
4.0 ” and over 160 100 15 17

 

Room-Temperature Hardness, Rc, of Hot-Rolled Rod
Diameter, in. Solution Treated (1800°F/1 hr, A.C.) Solution Treated & Precipitation Treated (1800°F/1 hr, A.C., + 1400°F/1 hr, F.C. to 1150°F, A.C., Hold for Total Pecipitation-Treating Time of 6 hr, A.C.)
0.875 21 / 26 36 /37
1.250 31 / 27 38 / 36
1.937 25 / 30 36 / 36

 

High-Temperature Properties of Hot-Rolled SolutionTreated (1800°F/1 hr) 1-in. Round
Temperature, °F Ultimate
Tensile Strength, ksi
Yield Strength (0.2% Offset), Ksi Elongation in 2″ (%) % Reduction of Area
85 174.0 115.0 27.5 41.0
400 168.0 113.2 29.0 40.0
600 160.5 107.5 30.0 37.0
800 159.0 106.5 31.0 42.0

Heat Treatment

AMS 5541 1300°F/20 hr., AC (Constant-temperature precipitation treatment).
AMS 5598 1350°F/8 hr., FC to 1150°F, Hold at 1150°F for total precipitation-treating time of 18 hr., AC (Furnace-cool precipitation treatment).

 

Effect of Heat Treatment on Hardness of Hot-Finished Products
Condition Hardness
BHN Rockwell
As-Rolled or As-Forged 228-298 20C-32C
Hot-Worked+1300°F/24 hr, A.C. 313-400 34C-44C
2100°F/2 hr, A.C. 140-277 77B-29C
2100°F/2 hr+1550°F/24 hr, A.C. 200-277 13C-29C
2100°F/2 hr+1550°F/24 hr, A.C.+ 1300°F/20 hr, A.C. 262-340 26C-37C
1625°F/24 hr, A.C. 200-298 13C-32C
1625°F/24 hr, A.C.+1300°F/20 hr, A.C. 302-363 32C-40C
1800°F/1 hr, A.C.+1350°F/8 hr, F.C. to 1150°F, Hold at 1150°F for Total Time of 18 hr, A.C. 32C-42C

 

Effect of precipitation-hardening conditions on hardness of solution-treated (2100°F) material.

x750 Effect of precipitation-hardening conditions on hardness of solution-treated (2100°F) material.

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