Nickel-chromium alloy, INCONEL 690, annealed

INCONEL 690, annealed, Designation

N06690, wrought
Condition	Annealed
UNS number	N06690
US name	ASTM Grade N06690
EN name	NiCr29Fe
EN number	2.4642

INCONEL 690, annealed, Tradenames

INCONEL 690	Special Metals Corp. (USA)
AD NY690	Aubert & Duval (FRANCE)

INCONEL 690, annealed, Typical uses

Production of nitric acid or nitric+hydrochloric acid solutions nuclear fuel reprocessing plants piping for gases containing sulfur

INCONEL 690, annealed, Composition detail

C (carbon)	0	–	0.05	%
Cr (chromium)	27	–	31	%
Cu (copper)	0	–	0.5	%
Fe (iron)	7	–	11	%
Mn (manganese)	0	–	0.5	%
Ni (nickel)	56.4	–	66	%
S (sulfur)	0	–	0.015	%
Si (silicon)	0	–	0.5	%

INCONEL 690, annealed, Physical properties

Density

8.08

–

8.2

g/cm³

INCONEL 690, annealed, Mechanical properties

Young’s modulus	195	–	215	GPa
Specific stiffness	23.9	–	26.4	MN.m/kg
Yield strength (elastic limit)	280	–	480	MPa
Tensile strength	630	–	845	MPa
Specific strength	34.4	–	59	kN.m/kg
Elongation	30	–	55	% strain
Compressive strength	280	–	480	MPa
Flexural modulus	195	–	215	GPa
Flexural strength (modulus of rupture)	280	–	480	MPa
Shear modulus	74	–	84	GPa
Bulk modulus	146	–	180	GPa
Poisson’s ratio	0.28	–	0.3
Shape factor	28
Hardness – Vickers	175	–	240	HV
Hardness – Rockwell B	86	–	97	HRB
Hardness – Rockwell C	5	–	20	HRC
Hardness – Brinell	168	–	224	HB
Elastic stored energy (springs)	203	–	532	kJ/m³
Fatigue strength at 10^7 cycles	250	–	425	MPa
Fatigue strength model (stress range) _{Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles}	224	–	475	MPa

INCONEL 690, annealed, Impact & fracture properties

Fracture toughness	314	–	347	MPa.m^0.5
Toughness (G)	476	–	591	kJ/m²

INCONEL 690, annealed, Thermal properties

Melting point	1350	–	1380	°C
Maximum service temperature	907	–	1.1e3	°C
Minimum service temperature	-273			°C
Thermal conductivity	13	–	15	W/m.°C
Specific heat capacity	440	–	475	J/kg.°C
Thermal expansion coefficient	11	–	13.5	µstrain/°C
Thermal shock resistance	110	–	196	°C
Thermal distortion resistance	1.01	–	1.3	MW/m
Latent heat of fusion	275	–	300	kJ/kg

INCONEL 690, annealed, Electrical properties

Electrical resistivity	110	–	120	µohm.cm
Electrical conductivity	1.44	–	1.57	%IACS
Galvanic potential	-0.15	–	-0.07	V

INCONEL 690, annealed, Magnetic properties

Magnetic type

Non-magnetic

INCONEL 690, annealed, Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	4890	–	5140	m/s
Mechanical loss coefficient (tan delta)	4e-4	–	8e-4

INCONEL 690, annealed, 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	6.4 m/min
Weldability _{Notes: Preheating is not required, post weld heat treatment is required}	Excellent

INCONEL 690, annealed, Durability

Water (fresh)	Excellent
Water (salt)	Excellent
Weak acids	Excellent
Strong acids	Acceptable
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.}	Acceptable
Flammability	Non-flammable

INCONEL 690, annealed, Corrosion resistance

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

Not susceptible

INCONEL 690, annealed, Notes

INCONEL 690, annealed, Warning

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

INCONEL 690, annealed, 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