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.

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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