Nickel-chromium alloy, WASPALOY, precipitation treated

WASPALOY Designation

Wrought Ni-Cr alloy: Waspaloy, Solution, Stabilization and Precip. Treated
Condition	Precipitation treated
UNS number	N07001
US name	ASTM Grade N07001; AMS 5708; AISI Grade 685
EN number	2.4654

WASPALOY Typical uses

Aerospace components and other high-temperature environments; heating elements and furnace hardware; electrical resistors and electronic components; combustion systems, afterburners, and fuel nozzles; equipment for chemical processing; machinery used in pulp and paper production; marine engineering structures; and nuclear reactor systems.

WASPALOY Composition detail

Al (aluminum)	1.2	–	1.6	%
B (boron)	0.003	–	0.01	%
C (carbon)	0.03	–	0.1	%
Co (cobalt)	12	–	15	%
Cr (chromium)	18	–	21	%
Cu (copper)	0	–	0.5	%
Fe (iron)	0	–	2	%
Mn (manganese)	0	–	1	%
Mo (molybdenum)	3.5	–	5	%
Ni (nickel)	49.6	–	62.5	%
P (phosphorus)	0	–	0.03	%
S (sulfur)	0	–	0.03	%
Si (silicon)	0	–	0.75	%
Ti (titanium)	2.75	–	3.25	%
Zr (zirconium)	0.02	–	0.12	%

WASPALOY Physical properties

Density

8.21

–

8.29

g/cm³

WASPALOY Mechanical properties

Young’s modulus	211	–	222	GPa
Specific stiffness	25.6	–	26.9	MN.m/kg
Yield strength (elastic limit)	758	–	862	MPa
Tensile strength	1100	–	1220	MPa
Specific strength	91.9	–	105	kN.m/kg
Elongation	14	–	30	% strain
Compressive strength	876	–	972	MPa
Flexural modulus	211	–	222	GPa
Flexural strength (modulus of rupture)	758	–	862	MPa
Shear modulus	80	–	84.1	GPa
Bulk modulus	176	–	185	GPa
Poisson’s ratio	0.3	–	0.312
Shape factor	20
Hardness – Vickers	300	–	400	HV
Hardness – Rockwell B	105	–	112	HRB
Hardness – Rockwell C	30	–	41	HRC
Hardness – Brinell	284	–	379	HB
Elastic stored energy (springs)	1330	–	1710	kJ/m^3
Fatigue strength at 10^7 cycles	441	–	724	MPa
Fatigue strength model (stress range) Parameters: Stress _{Ratio = -1, Number of Cycles = 1e7cycles}	430	–	743	MPa

WASPALOY Impact & fracture properties

Fracture toughness	123	–	136	MPa.m^0.5
Toughness (G)	69.5	–	85.8	kJ/m²

WASPALOY Thermal properties

Melting point	1330	–	1360	°C
Maximum service temperature	757	–	843	°C
Minimum service temperature	-273			°C
Thermal conductivity	11.6	–	12.6	W/m.°C
Specific heat capacity	513	–	534	J/kg.°C
Thermal expansion coefficient	12.2	–	12.9	µstrain/°C
Thermal shock resistance	277	–	320	°C
Thermal distortion resistance	0.918	–	1.01	MW/m
Latent heat of fusion	255	–	493	kJ/kg

WASPALOY Electrical properties

Electrical resistivity	121	–	127	µohm.cm
Electrical conductivity	1.36	–	1.42	%IACS
Galvanic potential	-0.04	–	0.04	V

WASPALOY Magnetic properties

Magnetic type

Non-magnetic

WASPALOY Optical, aesthetic and acoustic properties

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

WASPALOY Processing properties

Metal casting	Unsuitable
Metal cold forming	Acceptable
Metal hot forming	Acceptable
Metal press forming	Acceptable
Metal deep drawing	Limited use
Machining speed	2.74 m/min
Weldability _{Notes: Preheating is not required, post weld heat treatment is required}	Poor

WASPALOY 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

WASPALOY Corrosion resistance of metals

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

Not susceptible

WASPALOY Standards with similar compositions

International: NiCr20Co13Mo4Ti3Al to ISO 9723, NiCr20Co13Mo4Ti3Al to ISO 9724, NiCr20Co13Mo4Ti3Al to ISO 9725, NW7001 to ISO 9723, NW7001 to ISO 9724, NW7001 to ISO 9725

USA: N07001 to ASTM B637, UNS N07001, Waspaloy to SAE J467B