Specifications
- ASTM B637 & ASME SB637
- Plate, Sheet & Strip: AMS 5542/5598
- Rod & Bar: AMS 5667
- W-Nr 2.4669
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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| 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 | |
| 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.
| 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 |
| Temperature, °F | Modulus of Elasticity, 103 ksi | ||
|---|---|---|---|
| Tension | Torsion | ||
| Static | Dynamic | Static | |
| 80a | 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
| Ultimate Tensile Strength, ksi | 120 |
| .02% Yield Strength, ksi | 60 |
| Elongation, % | 30 |
| 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 |
| 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 |
| 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 |
| 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). |
| 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 |
