Nickel-chromium alloy, INCONEL X-750, annealed & aged

INCONEL X-750, annealed & aged, Designation

N07750, wrought
Condition	Annealed & aged
UNS number	N07750
US name	ASTM Grade N07750 Type 1; AMS 5542, 5598, 5667-5671, 5747, 5698, 5699
EN name	NiCr15Fe7TiAl
EN number	2.4669
ISO name	ISO 9723-9725, 6208

INCONEL X-750, annealed & aged, Tradenames

INCONEL X-750	Special Metals Corp. (USA)
HPM X750	Hamilton Precision Metals (USA)
ALTEMP X750	ATI Allegheny Ludlum (USA)
NICKELVAC X750	ATI Allvac (USA)

INCONEL X-750, annealed & aged, Typical uses

Aircraft turbine parts, industrial turbine parts

INCONEL X-750, annealed & aged, Composition detail

Al (aluminum)	0.4	–	1	%
C (carbon)	0	–	0.08	%
Co (cobalt)	0	–	1	%
Cr (chromium)	14	–	17	%
Cu (copper)	0	–	0.5	%
Fe (iron)	5	–	9	%
Mn (manganese)	0	–	1	%
Nb (niobium)	0.35	–	0.6	%
Ni (nickel)	70	–	75	%
S (sulfur)	0	–	0.01	%
Si (silicon)	0	–	0.5	%
Ta (tantalum)	0.35	–	0.6	%
Ti (titanium)	2.25	–	2.75	%

INCONEL X-750, annealed & aged, Physical properties

Density

8.21

–

8.29

g/cm³

INCONEL X-750, annealed & aged, Mechanical properties

Young’s modulus	211	–	222	GPa
Specific stiffness	25.6	–	26.9	MN.m/kg
Yield strength (elastic limit)	690	–	763	MPa
Tensile strength	1030	–	1140	MPa
Specific strength	83.6	–	92.5	kN.m/kg
Elongation	15	–	20	% strain
Compressive strength	855	–	945	MPa
Flexural modulus	211	–	222	GPa
Flexural strength (modulus of rupture)	690	–	763	MPa
Shear modulus	81	–	85.2	GPa
Bulk modulus	176	–	185	GPa
Poisson’s ratio	0.3	–	0.312
Shape factor	22
Hardness – Vickers	320	–	400	HV
Hardness – Rockwell B	107	–	112	HRB
Hardness – Rockwell C	32	–	41	HRC
Hardness – Brinell	303	–	379	HB
Elastic stored energy (springs)	1100	–	1340	kJ/m³
Fatigue strength at 10^7 cycles	430	–	660	MPa
Fatigue strength model (stress range) _{Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles}	422	–	672	MPa

INCONEL X-750, annealed & aged, Impact & fracture properties

Fracture toughness	105	–	116	MPa.m^0.5
Toughness (G)	50.6	–	62.4	kJ/m²

INCONEL X-750, annealed & aged, Thermal properties

Melting point	1390	–	1430	°C
Maximum service temperature	732	–	816	°C
Minimum service temperature	-273			°C
Thermal conductivity	11.4	–	12.4	W/m.°C
Specific heat capacity	461	–	480	J/kg.°C
Thermal expansion coefficient	13.3	–	14	µstrain/°C
Thermal shock resistance	231	–	261	°C
Thermal distortion resistance	0.829	–	0.911	MW/m
Latent heat of fusion	275	–	300	kJ/kg

INCONEL X-750, annealed & aged, Electrical properties

Electrical resistivity	116	–	127	µohm.cm
Electrical conductivity	1.36	–	1.49	%IACS
Galvanic potential	-0.1	–	-0.02	V

INCONEL X-750, annealed & aged, Magnetic properties

Magnetic type

Non-magnetic

INCONEL X-750, annealed & aged, Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	5060	–	5190	m/s
Mechanical loss coefficient (tan delta)	2e-4	–	4e-4

INCONEL X-750, annealed & aged, Processing properties

Metal casting	Unsuitable
Metal cold forming	Acceptable
Metal hot forming	Limited use
Metal press forming	Acceptable
Metal deep drawing	Limited use
Machining speed	3.96 m/min
Weldability _{Notes: Preheating is not required, post weld heat treatment is required}	Good

INCONEL X-750, annealed & aged, Durability

Water (fresh)	Excellent
Water (salt)	Excellent
Weak acids	Excellent
Strong acids	Excellent
Weak alkalis	Excellent
Strong alkalis	Excellent
Organic solvents	Excellent
Oxidation at 500C	Excellent
UV radiation (sunlight)	Excellent
Galling resistance (adhesive wear) _{Notes: Bronze or zinc alloy dies should be used to minimize galling.}	Limited use
Flammability	Non-flammable

INCONEL X-750, annealed & aged, Corrosion resistance of metals

Stress corrosion cracking
_{Note: Rated in chloride; Other susceptible environments: Hydroxide}

Not susceptible

INCONEL X-750, annealed & aged, Notes

Warning

All nickel compounds should be regarded as toxic. Some can cause cancer and/or fetal abnormalities.

Other notes

INCONEL is a registered trademark of the INCO group of companies.

As of September 1999 , INCONEL, INCOLOY, MONEL, NIMONIC, INCO-WELD, NILO, BRIGHTRAY, CORRONEL and UDIMET have become registered trademarks of Special Metals Corporation

INCONEL X-750, annealed & aged, Standards with similar compositions

International: NiCr15Fe7Ti2Al to ISO 6208, NiCr15Fe7Ti2Al to ISO 9724, NiCr15Fe7Ti2Al to ISO 9725, NW7750 to ISO 6208, NW7750 to ISO 9724, NW7750 to ISO 9725

USA: N07750 Type 1 to ASTM B637, N07750 Type 2 to ASTM B637, N07750 Type 3 to ASTM B637

Tradenames: INCONEL ALLOY 722, INCONEL ALLOY X-750, P.E.R 20 N