Nickel-chromium alloy, INCONEL 706, solution treated

INCONEL 706, solution treated, Designation

Wrought Ni-Cr alloy: Inconel 706
Condition	Solution treated
UNS number	N09706
US name	AMS 5701, AMS 5702, AMS 5703, AMS 5605, AMS 5606

INCONEL 706, solution treated, Tradenames

INCONEL 706	Special Metals Corp. (USA)
ALLVAC 706	ATI Allvac (USA)

INCONEL 706, solution treated, Typical uses

Aerospace, high temperature applications, heating elements, furnace parts, resistors, electronic parts, combustion systems, after burners, fuel nozzles, chemical processing equipment, pulp and paper manufacture, marine architecture, nuclear reactors

INCONEL 706, solution treated, Composition detail

Al (aluminum)	0	–	0.4	%
B (boron)	0	–	0.006	%
C (carbon)	0	–	0.06	%
Cr (chromium)	14.5	–	17.5	%
Cu (copper)	0	–	0.3	%
Fe (iron)	31.7	–	42.5	%
Mn (manganese)	0	–	0.35	%
Nb (niobium)	1.25	–	1.65	%
Ni (nickel)	39	–	44	%
P (phosphorus)	0	–	0.02	%
S (sulfur)	0	–	0.015	%
Si (silicon)	0	–	0.35	%
Ta (tantalum)	1.25	–	1.65	%
Ti (titanium)	1.5	–	2	%

INCONEL 706, solution treated, Physical properties

Density

8.04

–

8.12

g/cm3

INCONEL 706, solution treated, Mechanical properties

Young’s modulus	210	–	221	GPa
Specific stiffness	26	–	27.3	MN.m/kg
Yield strength (elastic limit)	896	–	1000	MPa
Tensile strength	1140	–	1260	MPa
Specific strength	111	–	124	kN.m/kg
Elongation	11	–	13	% strain
Compressive strength	876	–	1.05e3	MPa
Flexural modulus	210	–	221	GPa
Flexural strength (modulus of rupture)	896	–	1000	MPa
Shear modulus	76	–	79.9	GPa
Bulk modulus	291	–	306	GPa
Poisson’s ratio	0.38	–	0.396
Shape factor	18
Hardness – Vickers	330	–	400	HV
Hardness – Rockwell B	108	–	112	HRB
Hardness – Rockwell C	33	–	41	HRC
Hardness – Brinell	314	–	379	HB
Elastic stored energy (springs)	1860	–	2320	kJ/m3
Fatigue strength at 10^7 cycles	465	–	725	MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles	457	–	737	MPa

INCONEL 706, solution treated, Impact & fracture properties

Fracture toughness	74.2	–	82.4	MPa.m0.5
Toughness (G)	25.6	–	31.6	kJ/m2

INCONEL 706, solution treated, Thermal properties

Melting point	1330	–	1370	°C
Maximum service temperature	632	–	705	°C
Minimum service temperature	-273			°C
Thermal conductivity	11.8	–	12.8	W/m.°C
Specific heat capacity	469	–	488	J/kg.°C
Thermal expansion coefficient	14.2	–	14.9	µstrain/°C
Thermal shock resistance	283	–	322	°C
Thermal distortion resistance	0.804	–	0.883	MW/m
Latent heat of fusion	270	–	300	kJ/kg

INCONEL 706, solution treated, Electrical properties

Electrical resistivity	80	–	120	µohm.cm
Electrical conductivity	1.44	–	2.16	%IACS
Galvanic potential	-0.13	–	-0.05	V

INCONEL 706, solution treated, Magnetic properties

Magnetic type

Non-magnetic

INCONEL 706, solution treated, Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	5100	–	5230	m/s
Mechanical loss coefficient (tan delta)	1e-4	–	3e-4

INCONEL 706, solution treated, 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 706, solution treated, 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 706, solution treated, Corrosion resistance of metals

Pitting resistance equivalent number (PREN)	14.5 – 17.5
Pitting and crevice corrosion	Low (<20)
Stress corrosion cracking Note: Rated in chloride; Other susceptible environments: Hydroxide	Not susceptible

INCONEL 706, solution treated, Notes

INCONEL 706, solution treated, Warning

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

INCONEL 706, solution treated, Standards with similar compositions

USA: UNS N09706

Tradenames: INCONEL ALLOY 706, P.E.R 706, UDIMET 706