Specifications
- ASTM B637 & ASME SB637
- Plate, Sheet & Strip: AMS 5542/5598
- Rod & Bar: AMS 5667
- W-Nr 2.4669
If you are seeking fasteners with durable performance under extreme heat and corrosive conditions, Hastelloy® X750 is a trusted solution. At Nickel Systems, we supply premium fasteners made from this high-performance alloy to support the most demanding applications. As a true stocking distributor, we maintain an inventory of hard-to-find UNS N07750 fasteners for immediate shipment. Whether you need bolts, nuts or custom fasteners, we make sourcing exotic alloy fasteners straightforward.
Hastelloy® X750 possesses unique characteristics that are desirable in numerous industrial applications. If your question isn’t answered below, download the complete technical data sheet here.
| 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 |
Hastelloy® X750 is a precipitation-hardenable nickel-chromium alloy engineered for high-temperature strength, corrosion resistance and long-term thermal stability.
Hastelloy® X750 is a nickel-chromium alloy strengthened with additions of titanium and aluminum. This formulation gives it excellent creep resistance, tensile strength and oxidation resistance, even in environments reaching 1300 degrees Fahrenheit. Although much of the effect of precipitation hardening is lost with increasing temperature, it provides useful mechanical properties in temperatures as high as 1800 degrees Fahrenheit. Its resilience and stability make it ideal for structural components subjected to mechanical stress, high-pressure systems or corrosive processing conditions. Hastelloy X750 also has excellent properties down to cryogenic temperatures.
The following are Hastelloy® X750’s chemical constituents as per ASTM standards:
This composition follows ASTM B637 material specifications for alloy UNS N07750. Some trademarked alloy compositions may vary slightly within the UNS number range. If you require alternate chemistry or proprietary variants, please include those details when requesting a quote.
This material may also appear under the following names:
