Nickel-chromium alloy, INCONEL 625, Annealed

INCONEL 625, annealed, Designation

N06625, wrought
Condition	Annealed
UNS number	N06625
US name	ASTM Grade N06625; AMS 5666, 5837, 5599, 5869; MAM 5599, 5581
EN name	NiCr22Mo9Nb
EN number	2.4856
ISO name	ISO 9724, 9725, 6207, NW6690
JIS (Japanese) name	NCF 625 (Plate/Sheet)

INCONEL 625, annealed, Tradenames

INCONEL 625	Special Metals Corp. (USA)
AD PER625	Aubert & Duval (FRANCE)

INCONEL 625, annealed, Typical uses

Combustion systems, after-burners, fuel nozzles, chemical processing equipment, ships, submarines, nuclear reactors

INCONEL 625, annealed, Composition detail

Al (aluminum)	0	–	0.4	%
C (carbon)	0	–	0.1	%
Co (cobalt)	0	–	1	%
Cr (chromium)	20	–	23	%
Fe (iron)	0	–	5	%
Mn (manganese)	0	–	0.5	%
Mo (molybdenum)	8	–	10	%
Nb (niobium)	3	–	4.15	%
Ni (nickel)	58	–	66	%
P (phosphorus)	0	–	0.015	%
S (sulfur)	0	–	0.015	%
Si (silicon)	0	–	0.5	%
Ta (tantalum)	0	–	0.15	%
Ti (titanium)	0	–	0.4	%

INCONEL 625, annealed, Physical properties

Density

8.4

–

8.48

g/cm3

INCONEL 625, annealed, Mechanical properties

Young’s modulus	205	–	216	GPa
Specific stiffness	24.3	–	25.5	MN.m/kg
Yield strength (elastic limit)	365	–	434	MPa
Tensile strength	814	–	900	MPa
Specific strength	43.2	–	51.4	kN.m/kg
Elongation	30	–	34.9	% strain
Compressive strength	365	–	455	MPa
Flexural modulus	205	–	216	GPa
Flexural strength (modulus of rupture)	365	–	434	MPa
Shear modulus	81	–	85.2	GPa
Bulk modulus	156	–	164	GPa
Poisson’s ratio	0.28	–	0.291
Shape factor	27
Hardness – Vickers	145	–	250	HV
Hardness – Rockwell B	78	–	99	HRB
Hardness – Rockwell C	0	–	22	HRC
Hardness – Brinell	145	–	236	HB
Elastic stored energy (springs)	319	–	446	kJ/m3
Fatigue strength at 10^7 cycles	450	–	500	MPa
Fatigue strength model (stress range) Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles	424	–	531	MPa

INCONEL 625, annealed, Impact & fracture properties

Fracture toughness	190	–	211	MPa.m0.5
Toughness (G)	171	–	212	kJ/m2

INCONEL 625, annealed, Thermal properties

Melting point	1290	–	1350	°C
Maximum service temperature	882	–	982	°C
Minimum service temperature	-273			°C
Thermal conductivity	9.9	–	10.7	W/m.°C
Specific heat capacity	419	–	436	J/kg.°C
Thermal expansion coefficient	12.8	–	13.4	µstrain/°C
Thermal shock resistance	132	–	159	°C
Thermal distortion resistance	0.75	–	0.824	MW/m
Latent heat of fusion	280	–	300	kJ/kg

INCONEL 625, annealed, Electrical properties

Electrical resistivity	125	–	133	µohm.cm
Electrical conductivity	1.3	–	1.38	%IACS
Galvanic potential	-0.13	–	-0.05	V

INCONEL 625, annealed, Magnetic properties

Magnetic type

Non-magnetic

INCONEL 625, annealed, Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	4930	–	5050	m/s
Mechanical loss coefficient (tan delta)	4e-4	–	6e-4

INCONEL 625, 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	5.18 m/min
Weldability Notes: Preheating is not required, post weld heat treatment is required	Excellent
Weldability – MIG	Good
Weldability – plasma	Good
Weldability – SAW	Good
Weldability – TIG	Good
Brazeability	Good

INCONEL 625, 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 625, annealed, Corrosion resistance

Stress corrosion cracking Note: Rated in chloride; Other susceptible environments: Hydroxide	Not susceptible
Intergranular (weld line) corrosion	Excellent
Inorganic acids	Good
Organic acids	Good
Alkalis	Good
Humidity / water	Excellent
Sea water	Excellent
Sour oil and gas	Excellent

INCONEL 625, annealed, Notes

INCONEL 625, annealed, Warning

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

INCONEL 625, 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

INCONEL 625, annealed, Standards with similar compositions

International: NiCr22Mo9Nb to ISO 6207, NiCr22Mo9Nb to ISO 6208, NiCr22Mo9Nb to ISO 9723, NiCr22Mo9Nb to ISO 9724, NiCr22Mo9Nb to ISO 9725, NW6625 to ISO 6207, NW6625 to ISO 6208, NW6625 to ISO 9723, NW6625 to ISO 9724, NW6625 to ISO 9725

UK: NA21 to BS 3074, NA21 to BS 3076

USA: N06625 to ASTM B443, N06625 to ASTM B444, N06625 to ASTM B446, N06625 to ASTM B704, N06625 to ASTM B705, UNS N06625

Tradenames: CABOT ALLOY NO. 625, EMVAC 625, INCONEL ALLOY 625, INCONEL FILLER METAL 625, P.E.R 625, UDIMET 625, UNITEMP 625