Nickel-Fe-Cr alloy, INCOLOY 825, annealed

INCOLOY 825, annealed, Designation

Unified Numbering System (USA): N08825
Condition	Annealed
UNS number	N08825
US name	ASTM Grade N08825
EN name	NiCr21Mo
EN number	2.4858
ISO name	NiFe30Cr21Mo3 to ISO 9723, 9724, 9725, 6208, 6207

INCOLOY 825, annealed, Tradenames

INCOLOY 825

Special Metals Corp. (USA)

INCOLOY 825, annealed, Typical uses

Chemical processing equipment, esp. phosphoric acid evaporators

Pickling equipment

Nuclear fuel reprocessing equipment

Propeller shafts

Tanker trucks

INCOLOY 825, annealed, Compositional summary

Ni38-46 / Fe21-38 / Cr20-24 / Mo2.5-3.5 / Cu1.5-3 / Ti0.6-1.2 (impurities: Mn<1, Si<0.5, Al<0.2, C<0.05, S<0.03)

Material family Metal (non-ferrous)

Base material Ni (Nickel)

INCOLOY 825, annealed, Composition

Al (aluminum)	0	–	0.2	%
C (carbon)	0	–	0.05	%
Cr (chromium)	19.5	–	23.5	%
Cu (copper)	1.5	–	3	%
Fe (iron)	21	–	37.9	%
Mn (manganese)	0	–	1	%
Mo (molybdenum)	2.5	–	3.5	%
Ni (nickel)	38	–	46	%
S (sulfur)	0	–	0.03	%
Si (silicon)	0	–	0.5	%
Ti (titanium)	0.6	–	1.2	%

INCOLOY 825, annealed, Physical properties

Density

8.050

–

8.250

g/cm³

INCOLOY 825, annealed, Mechanical properties

Young’s modulus	190	–	200	GPa
Specific stiffness	23.3	–	24.6	MN.m/kg
Yield strength (elastic limit)	270	–	440	MPa
Tensile strength	585	–	765	MPa
Specific strength	33.1	–	54	kN.m/kg
Elongation	35	–	50	% strain
Compressive strength	375	–	470	MPa
Flexural modulus	190	–	200	GPa
Flexural strength (modulus of rupture)	270	–	440	MPa
Shear modulus	70	–	80	GPa
Bulk modulus	185	–	225	GPa
Poisson’s ratio	0.33	–	0.35
Shape factor	28
Hardness – Vickers	140	–	180	HV
Hardness – Rockwell B	77	–	87	HRB
Hardness – Rockwell C	0	–	6	HRC
Hardness – Brinell	140	–	172	HB
Elastic stored energy (springs)	196	–	473	kJ/m³
Fatigue strength at 10^7 cycles	230	–	385	MPa
Fatigue strength model (stress range) Parameters: Stress _{Ratio = -1, Number of Cycles = 1e7cycles}	210	–	422	MPa

INCOLOY 825, annealed, Impact & fracture properties

Fracture toughness	244	–	271	MPa.m^0.5
Toughness (G)	304	–	376	kJ/m²

INCOLOY 825, annealed, Thermal properties

Melting point	1370	–	1400	°C
Maximum service temperature	787	–	987	°C
Minimum service temperature	-273			°C
Thermal conductivity	11	–	11.5	W/m.°C
Specific heat capacity	420	–	460	J/kg.°C
Thermal expansion coefficient	12	–	14	µstrain/°C
Thermal shock resistance	106	–	176	°C
Thermal distortion resistance	0.801	–	0.94	MW/m
Latent heat of fusion	270	–	300	kJ/kg

INCOLOY 825, annealed, Electrical properties

Electrical resistivity	112	–	114	µohm.cm
Electrical conductivity	1.51	–	1.54	%IACS
Galvanic potential	-0.19	–	-0.11	V

INCOLOY 825, annealed, Magnetic properties

Magnetic type

Non-magnetic

INCOLOY 825, annealed, Optical, aesthetic and acoustic properties

Transparency	Opaque
Acoustic velocity	4820	–	4960	m/s
Mechanical loss coefficient (tan delta)	4e-4	–	9e-4

INCOLOY 825, annealed, Processing properties

Metal casting	Unsuitable
Metal cold forming	Acceptable
Metal hot forming	Acceptable
Metal press forming	Acceptable
Metal deep drawing	Unsuitable
Machining speed	11 m/min
Weldability _{Notes: Preheating is not required, post weld heat treatment is required}	Good
Weldability – MIG	Good
Weldability – plasma	Good
Weldability – SAW	Good
Weldability – TIG	Good
Brazeability	Good

INCOLOY 825, 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 825, annealed, Corrosion resistance of metals

Pitting resistance equivalent number (PREN)	27.8 – 35.1
Pitting and crevice corrosion	High (30-40)
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 825, 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 825, annealed, Standards with similar compositions

International: NiFe20Cr21Mo3 to ISO 9725, NiFe30Cr21Mo3 to ISO 6207, NiFe30Cr21Mo3 to ISO 6208, NW8825 to ISO 6207, NW8825 to ISO 6208, NW8825 to ISO 9725

Japan: NCF825 to JIS G4902, NCF825TP to JIS G4903

USA: 11F to SAE J470c, UNS N08825

Tradenames: CARLSON 825, DMV 825, INCOLOY 825, INCOLOY FILLER METAL 65, NAS 825