Incology alloy 825, UNS N08825, EN 2.4858 nickel-iron-chromium alloy with additions of molybdenum and copper.

It has excellent resistance to both reducing and oxidizing acids, stress-corrosion cracking and localized
attack such as pitting and crevice corrosion. The alloy is especially resistant to sulfuric and phosphoric acids.

Applications for chemical processing, pollution-control equipment, oil and gas well piping, nuclear fuel reprocessing,
acid production and pickling equipment.

Alloy 825 (2.4858/N08825) is characterized by:

• High resistance to chloride-induced stress corrosion
• Good resistance to chloride-induced pitting and crevice corrosion
• Good resistance to oxidizing and non-oxidizing hot acids

Industries served
Oil & Gas, Chemical Processing, Nuclear Power Generation, Toxic Waste Management.

Chemical Composition
Ni: 38.0 – 46.0
Cr: 19.5 – 23.5
Ti: 0.6 – 1.2
Mo: 2.5 – 3.5
Mn: 1.0 max
S: .50 max
Si: .50 max
Fe: 22 balance
Al: 0.20 max
C: 0.05 max
S: 0.030 max

Physical Properties
Density: 0.294 lb/in3, (8.14 g/cm3)

Modulus of Elasticity (E):
At 70°F (20°C): 28.3 x 103 ksi (196 GPa)

Modulus of Rigidity (G):
At 70°F (20°C): 11.0 x 103 ksi (76 GPa)

Coefficient of Expansion:
11.1 µin/in.-°F (70°F to 2000°F)
20.2 µm/m-°C (25°C to 1100°C)

Electrical Resistivity: 44.1 µΩ.in, (112 µΩ.cm)

Thermal Conductivity: 76.8 Btu-in/ft2hr-°F, (11.1 W/m-°C)

Applicable Specifications
Wire & Bar: ASTM B425, NACE MR0175/ISO 15156, NACE MR0103.

Typical Mechanical Properties – Spring Applications
Annealed
Heat Treatment: 1700-1975°F (930-1080°C)
Tensile Strength: 85 – 105 ksi; (586-724 MPa)
Suggested Operating Conditions: Up to 1000°F (538°C)

Spring
Tensile Strength: 150 ksi min; (1035 MPa)
Suggested Operating Conditions: Up to 500°F (260°C)

Wuxi Guanglu Special Steel Co., Ltd. – your productivity partner for high performance specialty alloys.

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