Special Metals INCONEL Alloy X-750

Subcategory: Metal; Nickel Base; Superalloy

Key Words: MIL-N-7786, MIL-N-8550, MIL-S-23192, MIL-N-24114; NACE MR-01-75; AFNOR NC 15 FeT, SAE AMS 5542, 5582, 5583, 5598, 5667 - 5671, 5698, 5699, 5747, 7246, UNS N07750; BS HR505; ASTM B 637; ASME SB-637, Boiler Code Section III; Werkstoff Nr. 2.4669

Component   Wt. %
Al0.4 - 1 
CMax 0.08 
CoMax 1 
Cr14 - 17 
Component   Wt. %
CuMax 0.5 
Fe5 - 9 
MnMax 1 
Nb0.7 - 1.2 
Component   Wt. %
NiMin 70 
SMax 0.01 
SiMax 0.5 
Ti2.25 - 2.75 

Material Notes:
Nickel content above includes cobalt; Nb content above includes Ta. A nickel-chromium alloy similar to INCONEL alloy 600 but made precipitation hardenable by additions of aluminum and titanium. The alloy has good resistance to corrosion and oxidation along with high tensile and creep-rupture properties at temperatures to about 1300F (700C). Its excellent relaxation resistance is useful for high-temperature springs and bolts. Used in gas turbines, rocket engines, nuclear reactors, pressure vessels, tooling, and aircraft structures. Standard product forms are round, flats, extruded section, forging stock, plate, sheet, strip, pipe, tube, and wire.

Data provided by the manufacturer, Special Metals.

Physical PropertiesMetricEnglishComments
Density8.28 g/cc0.299 lb/in 

Mechanical Properties
Tensile Strength, Ultimate1250 MPa181000 psi Precipitation Hardened. Value at room temperature.
Tensile Strength, Ultimate at Elevated Temperature1120 MPa162000 psi Precipitation Hardened prior to test; 550C
Tensile Strength, Yield850 MPa123000 psi Precipitation Hardened. Value at room temperature; 0.2% offset.
Tensile Strength, Yield at Elevated Temperature760 MPa110000 psi Precipitation Hardened prior to test; 0.2% offset; 550C
Elongation at Break30 %30 % Precipitation Hardened
Elongation at Break at Elevated Temperature22 %22 % Precipitation Hardened prior to test.; 550C

Electrical Properties
Electrical Resistivity0.000122 ohm-cm0.000122 ohm-cm 
Magnetic Permeability1.00351.0035 at 200 oersted (15.9 kA/m)
Curie Temperature-125 C-193 F 

Thermal Properties
CTE, linear 20C12.6 m/m-C7 in/in-F 20-100C
Specific Heat Capacity0.431 J/g-C0.103 BTU/lb-F 
Thermal Conductivity12 W/m-K83.3 BTU-in/hr-ft-F 
Melting Point1390 - 1430 C2530 - 2610 F 
Solidus1390 C2530 F 
Liquidus1430 C2610 F 

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