HAYNES® X-750 alloy
Principal Features
HAYNES® X-750 (UNS N07750) alloy is an age-hardenable, nickel-base superalloy with a very good strength at temperatures up to about 1600°F (870°C). It is widely used as a wrought material for forged and fabricated parts in aerospace and industrial applications. Its strength is somewhat less than that for HAYNES® 718 alloy up to about 1400°F (760°C), and lower than that for HAYNES® R-41 alloy at higher temperatures. Alloy X-750 can be cold-formed in the annealed condition, and may also be hot-formed at temperatures of about 1900°F (1040°C) or above. Weldability is somewhat limited by susceptibility to strain age-cracking under conditions of heavy restraint. The alloy exhibits good resistance to oxidizing combustion gas environments at temperatures up to about 1600°F (870°C).
*Please contact our technical support team if you have technical questions about this alloy.
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Nominal Composition
Weight % | |
Nickel | 70 Balance |
Chromium | 16.0 |
Iron | 8.0 |
Titanium | 2.5 |
Niobium* + Tantalum | 1 |
Aluminum | 0.8 |
Cobalt | 1 max. |
Manganese | 0.35 max. |
Silicon | 0.35 max. |
Carbon | 0.08 max. |
Stress-Rupture Data
Sheet (AMS 5598)
Test Tempature | Approximate Initial Stress to Produce Rupture in | ||||||
10 h | 100h | 1000 h | |||||
°F | °C | ksi | MPa | ksi | MPa | ksi | MPa |
1100 | 600 | 120 | 825 | 85 | 585 | 71 | 490 |
1200 | 650 | 80 | 550 | 66 | 455 | 50 | 345 |
1300 | 705 | 61 | 420 | 45 | 310 | 29 | 200 |
1400 | 760 | 41 | 285 | 26 | 180 | 15 | 105 |
1600 | 815 | 24 | 165 | 14 | 97 | 7.4 | 51 |
1700 | 870 | 12.5 | 86 | 6.6 | 46 | - | - |
1800 | 925 | 6.5 | 45 | - | - | - | - |
Heat Treatment
Sheet and Strip
1900°F (1040°C)/Bright-anneal + 1350°F (730°C)/8 h/FC to 1150°F (620°C)/8 h/AC
Physical Properties
Physical Property | British Units | Metric Units | ||
Density | RT |
0.298 lb/in.3 |
RT |
8.26 g/cm3 |
Melting Range | 2540-2600°F | - | 1395-1425°C | - |
Thermal Conductivity | 400°F |
82 Btu.in/h.ft2.°F |
200°C | 14.1 W/m.°C |
600°F |
93 Btu.in/h.ft2.°F |
400°C | 16.9 W/m.°C | |
800°F |
107 Btu.in/h.ft2.°F |
600°C | 19.8 W/m.°C | |
1000°F |
120 Btu.in/h.ft2.°F |
700°C | 21.3 W/m.°C | |
1200°F |
132 Btu.in/h.ft2.°F |
800°C | 22.7 W/m.°C | |
1400°F |
147 Btu.in/h.ft2.°F |
900°C | 24.0 W/m.°C | |
Mean Coefficient of Thermal Expansion | RT | - | RT | - |
70-800°F | 7.8 µin/in.°F | 20-500°C | 14.3 µm/m-°C | |
70-1000°F | 8.0 µin/in.°F | 20-600°C | 14.8 µm/m-°C | |
70-1200°F | 8.4 µin/in.°F | 20-700°C | 15.5 µm/m-°C | |
70-1400°F | 8.9 µin/in.°F | 20-800°C | 16.3 µm/m-°C | |
70-1600°F | 9.4 µin/in.°F | 20-900°C | 17.4 µm/m-°C | |
70-1800°F | 9.8 µin/in.°F | 20-1000°C | 17.9 µm/m-°C | |
Electrical Resistivity | 700°F | 47.7 µohm.in | 20°C | 121 µohm.cm |
400°F | 48.8 µohm.in | 200°C | 124 µohm.cm | |
800°F | 50.5 µohm.in | 400°C | 126 µohm.cm | |
1000°F | 51.2 µohm.in | 600°C | 130 µohm.cm | |
1200°F | 51.3 µohm.in | 700°C | 129 µohm.cm | |
1400°F | 50.7 µohm.in | 800°C | 128 µohm.cm | |
1600°F | 49.8 µohm.in | 900°C | 126 µohm.cm | |
Dynamic Modulus of Elasticity | 70°F |
31.0 x 106 psi |
20°C | 214 GPa |
400°F |
29.2 x 106 psi |
200°C | 201 GPa | |
800°F |
27.4 x 106 psi |
400°C | 189 GPa | |
1000°F |
26.7 x 106 psi |
600°C | 184 GPa | |
1200°F |
25.5 x 106 psi |
700°C | 176 GPa | |
1400°F |
24.0 x 106 psi |
800°C | 165 GPa | |
1600°F |
22.1 x 106 psi |
900°C | 152 GPa | |
1800°F |
20.0 x 106 psi |
1000°C | 138 GPa |
RT = Room Temperature
Tensile Data
Sheet (AMS 5598)
Testing Tempature | Yield Strength 0.2% Offset | Ultimate Tensile Strength | Elongation | |||
°F | °C | ksi | MPa | ksi | MPa | % |
RT | RT | 141.1 | 975 | 192.2 | 1325 | 23.6 |
1000 | 538 | 124.9 | 860 | 162.1 | 1120 | 22.2 |
1200 | 649 | 121.1 | 835 | 143.6 | 990 | 5.8 |
1400 | 760 | 92.0 | 635 | 94.3 | 650 | 2.5 |
1600 | 871 | 43.1 | 295 | 52.1 | 360 | 8.0 |
1800 | 982 | 9.1 | 63 | 16.6 | 115 | 42.0 |
Specifications and Codes
Specifications
HAYNES® X-750 alloy (N07750) | |
Sheet, Plate & Strip | AMS 5542AMS 5598 |
Billet, Rod & Bar | AMS 5667AMS 5668AMS 5670AMS 5671AMS 5747 |
Coated Electrodes | - |
Bare Welding Rods & Wire | AMS 5778SFA 5.14/ A 5.14 (ERNiCrFe-8) |
Seamless Pipe & Tube | - |
Welded Pipe & Tube | - |
Fittings | - |
Forgings | AMS 5667AMS 5668AMS 5670AMS 5671AMS 5747SB 637/B 637 |
DIN | No. 2.4669NiCr15Fe7TiAl |
Others | NACE MR0175ISO 15156 |
Codes
HAYNES® X-750 alloy (N07750) | |
MMPDS | 6.3.6 |
Disclaimer
Haynes International makes all reasonable efforts to ensure the accuracy and correctness of the data displayed on this site but makes no representations or warranties as to the data’s accuracy, correctness or reliability. All data are for general information only and not for providing design advice. Alloy properties disclosed here are based on work conducted principally by Haynes International, Inc. and occasionally supplemented by information from the open literature and, as such, are indicative only of the results of such tests and should not be considered guaranteed maximums or minimums. It is the responsibility of the user to test specific alloys under actual service conditions to determine their suitability for a particular purpose.
For specific concentrations of elements present in a particular product and a discussion of the potential health affects thereof, refer to the Safety Data Sheets supplied by Haynes International, Inc. All trademarks are owned by Haynes International, Inc., unless otherwise indicated.
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