Alloy 825 Stainless Steel

Alloy 825 Stainless Steel

Alloy 825 Stainless Steel General Properties Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing. The nickel...
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Alloy 825 Stainless Steel

General Properties

Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing.


The nickel content of Alloy 825 makes it resistant to chloride stress-corrosion cracking, and combined with molybdenum and copper, provides substantially improved corrosion resistance in reducing environments when compared to conventional austenitic stainless steels. The chromium and molybdenum content of Alloy 825 provides resistance to chloride pitting, as well as resistance to a variety of oxidizing atmospheres. The addition of titanium stabilizes the alloy against sensitization in the as-welded condition. This stabilization makes Alloy 825 resistant to intergranular attack after exposure in the temperature range which would typically sensitize un-stabilized stainless steels.


Alloy 825 is resistant to corrosion in a wide variety of process environments including sulfuric, sulfurous, phosphoric, nitric, hydrofluoric and organic acids and alkalis such as sodium or potassium hydroxide, and acidic chloride solutions.


Chemical Analysis

Typical Values (Weight %)





Nickel38.0 min.–46.0 max.Iron22.0 min.
Chromium19.5 min.–23.5 max.Molybdenum2.5 min.–3.5 max.
Molybdenum8.0 min.-10.0 max.Copper1.5 min.–3.0 max.
Titanium0.6 min.–1.2 max.Carbon0.05 max.
Niobium (plus Tantalum)3.15 min.-4.15 max.Titanium0.40
Carbon0.10Manganese1.00 max.
Sulfur0.03 max.Silicon0.5 max.
Aluminium0.2 max.


Physical Properties

Density

0.294 lbs/in3
8.14 g/cm3

Specific Heat

0.105 BTU/lb-°F
440 J/kg-°K

Modulus of Elasticity

28.3 psi x 106 (100°F)
196 MPa (38°C)

Magnetic Permeability

1.005 Oersted (μ at 200H)


Thermal Conductivity

76.8 BTU/hr/ft2/ft-°F (78°F)
11.3 W/m-°K (26°C)

Melting Range

2500 – 2550°F
1370 – 1400°C

Electrical Resistivity

678 Ohm circ mil/ft (78°F)
1.13 μ cm (26°C)

Linear Coefficient of Thermal Expansion

7.8 x 10-6 in / in°F (200°F)
4 m / m°C (93°F)


Mechanical Properties

Typical Room Temperature Mechanical Properties, Mill Annealed

Yield Strength
0.2% Offset
Ultimate Tensile
Strength
Elongation
in 2 in.
Hardness

psi (min.)(MPa)psi (min.)(MPa)% (min.)Rockwell B
49,00033896,00066245135-165

Alloy 825 has good mechanical properties from cryogenic to moderately high temperatures. Exposure to temperatures above 1000°F (540°C) can result in changes to the microstructure that will significantly lower ductility and impact strength. For that reason, Alloy 825 should not be utilized at temperatures where creep-rupture properties are design factors. The alloy can be strengthened substantially by cold work. Alloy 825 has good impact strength at room temperature, and retains it’s strength at cryogenic temperatures.


Table 6 - Charpy Keyhole Impact Strength of Plate

TemperatureOrientationImpact Strength*

°F°C
ft-lbJ
RoomRoomLongitudinal79.0107
RoomRoomTransverse83.0113
-110-43Longitudinal78.0106
-110-43Transverse78.5106
-320-196Longitudinal67.091
-320-196Transverse71.597
-423-253Longitudinal68.092
-423-253Transverse68.092


Corrosion Resistance

The most outstanding attribute of Alloy 825 is its excellent corrosion resistance. In both oxidizing and reducing environments, the alloy resists general corrosion, pitting, crevice corrosion, intergranular corrosion and chloride stress-corrosion cracking.


Resistance to Laboratory Sulfuric Acid Solutions

AlloyCorrosion Rate in Boiling Laboratory Sulfuric Acid Solution Mils/Year (mm/a)

10%40%50%
316636 (16.2)>1000 (>25)>1000 (>25)
82520 (0.5)11 (0.28)20 (0.5)
62520 (0.5)Not Tested17 (0.4)


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