INCOLOY Alloy 825 Round Bar, N08825 Rod

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Alloy 825

Incoloy® alloy 825 (UNS N08825) is a nickel-iron-chromium austenitic alloy enhanced with molybdenum, copper, and titanium. Designed for outstanding corrosion resistance in both oxidizing and reducing environments, this alloy exhibits excellent resistance to chloride-induced stress-corrosion cracking and pitting. The inclusion of titanium stabilizes the alloy, preventing sensitization in the as-welded condition and ensuring resistance to intergranular attack—an issue that typically affects unstabilized stainless steels exposed to sensitizing temperature ranges. Incoloy® alloy 825 is highly versatile in fabrication, offering excellent formability and weldability across various techniques, similar to other nickel-based alloys.

*Incoloy is a trademark of Special Metals Corp

BS 3076 NA16 2.4858 NFe 32 C 20 DU NiCr 21 Mo UNS N08825 API 6CRA 825

Size Ranges

BAR

Dia. 0.5" to 15" (12.7 mm to 381 mm)
FLAT

Thickness 0.008" to 4" (0.20 mm to 102mm) widths to 48" (1219 mm)
TUBULAR

O.D. 0.75" to 26" (19.1 mm to 660 mm)
BILLET

Diameter up to 44" Weights up to ca. 22,000 lb. (10,000 kg)

Minimum Mill Quantities: Small batch quantities, 300 or 500 kg, can be offered for most bar & tube sizes.

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Chemical Composition

		C	Si	Mn	S	Cr	Mo	Ni	Ti	Fe	Cu	AL	P	Co
N 08825	Min %					19,50	2,50	38,00	0,60	22,00	1,50
N 08825	Max %	0,05	0,50	1,00	0,03	23,50	3,50	46,00	1,20		3,00	0,20
ASTM B 423
2.4858	Min %					19,50	2,50	38,00	0,60	balance	1,50
2.4858	Max %	0,025	0,50	1,00	0,015	23,50	3,50	46,00	1,20	balance	3,00	0,20	0,02	1,00
(Key to Steel 2010)
alloy 825	Min %					19,50	2,50	38,00	0,60	22,00	1,50
alloy 825	Max %	0,05	0,50	1,00	0,03	23,50	3,50	46,00	1,20		3,00	0,20

Physical properties

Property	Value
Density: Densitiy kg/dm3	8,1
Hardness: HB	135-165
Permeability at 20°C/68°F	1,004

Temperature T °C/F (°C/F)	Specific heat J / kgK (Btu / lb °F)	Thermal conductivity W/mK (Btu·in / ft2·h·°F)	Electric resistance µΩ · cm (Ω circ mill / ft)	Modulus of elasticity kN/mm2 (103 ksi)	Expansion rate from 70°F bis T 10-6 / K (10-6 / °F)
20	440	10,8	11,2	195
100	462	2,4	114	190	14,1
300	488 (0,117)	14,1 (98)	118 (710)	185 (26,8)	15,2
500	540 (0,131)	16,9 (120)	124 (751)	174 (25,0)	15,7
500/932 (538/1000)	565 (0,137	18,3 (131)	126 (761)	168 (23,8)	15,8 (8,8)
700/1292 (760/1400)	615 (0,153)	21 (155)	127 (765)	154 (21,2)	16,7 (9,5)
900/1652) 982(1800)	680 (0,167)	25,7 (192)	129 (782)	130 (17,3)	17,6 (9,9)
1000/1832	710	28,1	130	119	17,9

Mechanical properties (20°C / 68°F)

Yield strength	>=235
Yield strength	265
Tensile strength	100
Ultimate strain	45
Impact energy ISO-V	>=150 >= 100
(average value of 3 samples)
Remarks

Temparature information

Application area
Operation temperature	-321 ºF to 1022 ºF

Soft annealing
Working temperature	1688 ºF to 1796 ºF
Explanation report	cooling by water
Processing informations	preferably 1700°F

Solution heat treatment
Working temperature	2102 ºF to 1652 ºF	quick cooling air/water
Explanation report	when reaching 1652°F re-heating is required
Processing informations	heat oven to must value and insert component hold for approx. 60 min per 4" thickness

Process information

Cold forming

string cold work hardening, process component in annealed state,
forming >15% require anew annealing

Chip removing process

process when annealed - mind tendency for cold work hardeneing

Welding
- Material classification acc. CEN ISO/TR 15608	45
- Type	WIG plasma welding MIG/MAG
- Add. material	material nr. 2831/ rod electrode W.Nr. 2621
- Hints	No translation!

A brief history of Alloy 825
Originally developed in the 1950s, Alloy 825 was designed as a nickel-iron-chromium alloy with the addition of molybdenum, copper, and titanium to enhance its corrosion resistance. It was specifically engineered to perform in highly aggressive environments, particularly those involving strong acids and chloride-induced corrosion. Over time, its excellent resistance to stress corrosion cracking, pitting, and crevice corrosion made it a widely used material in chemical processing, marine, and energy industries.
Common applications
Alloy 825 is extensively used in industries that require superior corrosion resistance. In the chemical processing sector, it is used for heat exchangers, piping, and acid production equipment, where exposure to sulfuric and phosphoric acids is common. In the marine and offshore industries, it is employed in seawater-cooled heat exchangers, desalination systems, and subsea piping due to its ability to resist chloride-induced stress corrosion cracking. Additionally, the oil and gas industry utilizes Alloy 825 for downhole tubing, wellhead components, and pipelines that encounter sour gas and high-pressure environments.
Resistance to corrosion and performance
With a high nickel content, Alloy 825 offers exceptional resistance to both reducing and oxidizing environments, making it highly effective in acidic and chloride-rich conditions. The addition of molybdenum enhances its resistance to pitting and crevice corrosion, while copper improves its stability in sulfuric acid environments. Titanium contributes to resistance against intergranular corrosion, ensuring long-term performance in extreme conditions. The alloy maintains its mechanical properties across a broad temperature range, making it suitable for both cryogenic and elevated-temperature applications.
Modern Innovations
Advancements in material processing and fabrication techniques have expanded the applications of Alloy 825. Improved welding and heat treatment processes allow for the production of complex components with enhanced durability and corrosion resistance. The alloy’s role has grown in renewable energy applications, including geothermal and waste-to-energy systems, where resistance to high-temperature corrosive gases is critical. Today, Alloy 825 continues to be a trusted material for industries requiring long-lasting performance in harsh and corrosive environments.

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