Nickel-chromium alloy, INCONEL 671, Annealed

INCONEL 671, annealed, Designation

INCO Inc., Proprietary wrought alloy: “INCONEL 671”
Condition	Annealed
UNS number	N06671

INCONEL 671, annealed, Tradenames

INCONEL 671

Special Metals Corp. (USA)

INCONEL 671, annealed, Typical uses

Power generation equipment, e.g. superheater tube shields, soot blower tubes, boiler components, pressure vessels for paper and pulp processing

INCONEL 671, annealed, Composition detail

C (carbon)	0.05	%
Cr (chromium)	46	%
Ni (nickel)	53.6	%
Ti (titanium)	0.35	%

INCONEL 671, annealed, Physical properties

Density

7.8

–

7.92

g/cm³

INCONEL 671, annealed, Mechanical properties

Young’s modulus	215	–	245	GPa
Specific stiffness	27.3	–	31.2	MN.m/kg
Yield strength (elastic limit)	430	–	535	MPa
Tensile strength	770	–	955	MPa
Specific strength	54.7	–	68.1	kN.m/kg
Elongation	15	–	35	% strain
Compressive strength	430	–	535	MPa
Flexural modulus	215	–	245	GPa
Flexural strength (modulus of rupture)	430	–	535	MPa
Shear modulus	80	–	100	GPa
Bulk modulus	145	–	190	GPa
Poisson’s ratio	0.26	–	0.28
Shape factor	27
Hardness – Vickers	170	–	200	HV
Hardness – Rockwell B	85	–	92	HRB
Hardness – Rockwell C	4	–	11	HRC
Hardness – Brinell	164	–	193	HB
Elastic stored energy (springs)	404	–	622	kJ/m³
Fatigue strength at 10^7 cycles	305	–	480	MPa
Fatigue strength model (stress range) _{Parameters: Stress Ratio = -1, Number of Cycles = 1e7cycles}	281	–	521	MPa

INCONEL 671, annealed, Impact & fracture properties

Fracture toughness	136	–	151	MPa.m^0.5
Toughness (G)	79.8	–	101	kJ/m²

INCONEL 671, annealed, Thermal properties

Melting point	1310	–	1350	°C
Maximum service temperature	877	–	1.08e3	°C
Minimum service temperature	-273			°C
Thermal conductivity	12	–	17	W/m.°C
Specific heat capacity	445	–	465	J/kg.°C
Thermal expansion coefficient	11	–	12.5	µstrain/°C
Thermal shock resistance	155	–	205	°C
Thermal distortion resistance	1.01	–	1.46	MW/m
Latent heat of fusion	275	–	300	kJ/kg

INCONEL 671, annealed, Electrical properties

Electrical resistivity	84	–	90	µohm.cm
Electrical conductivity	1.92	–	2.05	%IACS
Galvanic potential	-0.12	–	-0.04	V

INCONEL 671, annealed, Magnetic properties

Magnetic type

Non-magnetic

INCONEL 671, annealed, Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	5230	–	5590	m/s
Mechanical loss coefficient (tan delta)	3e-4	–	5e-4

INCONEL 671, 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	4.88 m/min
Weldability _{Notes: Preheating is not required, post weld heat treatment is required}	Good

INCONEL 671, annealed, 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.}	Acceptable
Flammability	Non-flammable

INCONEL 671, annealed, Corrosion resistance of metals

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

Not susceptible

INCONEL 671, annealed, Notes

INCONEL 671, annealed, Warning

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

INCONEL 671, 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