Nickel-Fe-Cr alloy, INCOLOY 801, annealed

INCOLOY 801, annealed, Designation

Unified Numbering System (USA): N08801
Condition	Annealed
UNS number	N08801
US name	ASTM Grade N08801

INCOLOY 801, annealed, Tradenames

INCOLOY 801

Special Metals Corp. (USA)

INCOLOY 801, annealed, Typical uses

Petrochemical processing equipment esp. hydrodesulfurizers and applications involving polythionic acid

INCOLOY 801, annealed, Compositional summary

Fe39-50 / Ni23-41 / Cr19-22 / Ti0.75-1.5 (impurities: Mn<1.5, Si<1, Cu<0.5, C<0.1, S<0.015, Other<0.1)
Material family	Metal (non-ferrous)
Base material	Ni (Nickel)

INCOLOY 801, annealed, Composition detail

C (carbon)	0	–	0.1	%
Cr (chromium)	19	–	22	%
Cu (copper)	0	–	0.5	%
Fe (iron)	39.4	–	50.2	%
Mn (manganese)	0	–	1.5	%
Ni (nickel)	23.1	–	40.8	%
S (sulfur)	0	–	0.015	%
Si (silicon)	0	–	1	%
Ti (titanium)	0.75	–	1.5	%
Other	0	–	0.1	%

INCOLOY 801, annealed, Physical properties

Density

7.85

–

8.05

g/cm³

INCOLOY 801, annealed, Mechanical properties

Young’s modulus	200	–	215	GPa
Specific stiffness	25.1	–	27.1	MN.m/kg
Yield strength (elastic limit)	175	–	260	MPa
Tensile strength	455	–	660	MPa
Specific strength	22	–	32.7	kN.m/kg
Elongation	40	–	60	% strain
Compressive strength	175	–	260	MPa
Flexural modulus	200	–	215	GPa
Flexural strength (modulus of rupture)	175	–	260	MPa
Shear modulus	70	–	85	GPa
Bulk modulus	195	–	240	GPa
Poisson’s ratio	0.33	–	0.35
Shape factor	30
Hardness – Vickers	130	–	160	HV
Hardness – Rockwell B	72	–	82	HRB
Hardness – Rockwell C	0	–	1	HRC
Hardness – Brinell	130	–	156	HB
Elastic stored energy (springs)	76.2	–	158	kJ/m³
Fatigue strength at 10^7 cycles	225	–	285	MPa
Fatigue strength model (stress range) Parameters: Stress _{Ratio = -1, Number of Cycles = 1e7cycles}	176	–	364	MPa

INCOLOY 801, annealed, Impact & fracture properties

Fracture toughness	284	–	316	MPa.m^0.5
Toughness (G)	388	–	482	kJ/m²

INCOLOY 801, annealed, Thermal properties

Melting point	1360	–	1390	°C
Maximum service temperature	777	–	977	°C
Minimum service temperature	-273			°C
Thermal conductivity	11.5	–	13.5	W/m.°C
Specific heat capacity	440	–	465	J/kg.°C
Thermal expansion coefficient	13	–	15	µstrain/°C
Thermal shock resistance	59.7	–	90.9	°C
Thermal distortion resistance	0.803	–	0.992	MW/m
Latent heat of fusion	270	–	300	kJ/kg

INCOLOY 801, annealed, Electrical properties

Electrical resistivity	96	–	106	µohm.cm
Electrical conductivity	1.63	–	1.8	%IACS
Galvanic potential	-0.22	–	-0.14	V

INCOLOY 801, annealed, Magnetic properties

Magnetic type

Non-magnetic

INCOLOY 801, annealed, Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	5010	–	5210	m/s
Mechanical loss coefficient (tan delta)	7e-4	–	0.0013

INCOLOY 801, annealed, Processing properties

Metal casting	Unsuitable
Metal cold forming	Acceptable
Metal hot forming	Acceptable
Metal press forming	Acceptable
Metal deep drawing	Unsuitable
Machining speed	13.7 m/min
Weldability Notes: Preheating is not required, post weld heat treatment is required	Good
Weldability – MIG	Fair
Weldability – plasma	Fair
Weldability – SAW	Fair
Weldability – TIG	Fair
Brazeability	Good

INCOLOY 801, 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.}	Limited use
Flammability	Non-flammable

INCOLOY 801, annealed, Corrosion resistance

Pitting resistance equivalent number (PREN)	19 – 22
Pitting and crevice corrosion	Medium (20-30)
Stress corrosion cracking _{Note: Rated in chloride; Other susceptible environments: Hydroxide}	Slightly susceptible
Intergranular (weld line) corrosion	Excellent
Inorganic acids	Excellent
Organic acids	Excellent
Alkalis	Good
Humidity / water	Excellent
Sea water	Moderate
Sour oil and gas	Excellent

INCOLOY 801, annealed, Notes

Warning

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

Other notes

INCOLOY is a registered tradename 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

INCOLOY 801, annealed, Standards with similar compositions

International: FeNi32Cr20Ti to ISO 6207, FeNi32Cr20Ti to ISO 6208, FeNi32Cr21Ti to ISO 9723, FeNi32Cr21Ti to ISO 9725, NW8801 to ISO 6207, NW8801 to ISO 6208, NW8801 to ISO 9723, NW8801 to ISO 9725

USA: UNS N08801

Tradenames: EASTERN NO. 801, INCOLOY 801, INCOLOY ALLOY 801