High Temp Metals 800-500-2141

ALLOY 825 TECHNICAL DATA


Type Analysis | Description | Application | Weldability | Physical Properties | Mechanical Properties

Type Analysis

Element

Min

Max

Nickel + Cobalt

38.0

46.0

Cobalt

---

2.00

Chromium

19.5

23.5

Copper

1.50

3.00

Iron

22.0

---

Silicon

--

0.50

Manganese

--

1.00

Carbon

--

0.05

Aluminum

---

0.20

Description

Alloy 825 is a nickel-iron-chromium-molybdenum alloy with good corrosion resistance to sulfuric and phosphoric acids and sea water. It is similar to alloy 800 but with improved resistance to aqueous corrosion. Although not fully resistant to stress-corrosion cracking in boiling magnesium chloride, alloy 825 has good resistance in neutral chloride media.


Application

Typical applications are: phosphoric acid evaporators; pickling-tank heater, pickling hooks and equipment; chemical process equipment; tank trucks; propeller shafts, and spent nuclear fuel element recovery.


Weldability

Alloy 825 can be readily welded by the shielded metal-arc process using alloy welding electrode 135, the gas shielded arc processes using alloy filler metal 65, and the resistance welding processes. The alloy requires no postweld heat treatment. The corrosion resistance of deposited weld metal from both covered electrode and bare wire is equivalent to that of the parent metal.


Physical Properties

Physical Properties

°F

British Units

°C

Metric Units

Density

Room

0.294 lb./in.(3)

Room

8.14 g/cm(3)

Electrical
Resistivity

Room
200
400
600
800

44.4 microhm-in.
44.9 microhm-in.
46.5 microhm-in.
47.6 microhm-in.
49.2 microhm-in.

Room
93
204
316
427

1.13 microhm-m
1.14 microhm-m
1.18 microhm-m
1.21 microhm-m
1.25 microhm-m

Mean Coefficient
of Thermal
Expansion

80-200
80-400
80-600
80-800

7.9 microin./in.-°F
8.3 microin./in.-°F
8.5 microin./in.-°F
8.7 microin./in.-°F

27-93
27-204
27-316
27-427

14.0 X 10(-6)m/m-K
14.9 X 10(-6)m/m-K
15.3 X 10(-6)m/m-K
15.7 X 10(-6)m/m-K

Thermal
Conductivity

Room
200
400
600
800

77 Btu-in/ft²-hr-°F
85 Btu-in/ft²-hr-°F
98 Btu-in/ft²-hr-°F
110 Btu-in/ft²-hr-°F
120 Btu-in/ft²-hr-°F

Room
93
204
316
427

11.1 W/m-K
12.3 W/m-K
14.1 W/m-K
15.9 W/m-K
17.3 W/m-K

Dynamic Modulus
of Elasticity

Room

28.0 x 10(6) psi

Room

193 GPa


Mechanical Properties

Form

Condition

Ultimate
Tensile
Strength,
ksi (MPa)

Yield
Strength
at 0.2%
offset,
ksi (MPa)

Elongation
in 2"
or 4D, percent

Sheet
Plate
Sheet, Plate
Strip, Bar

Annealed
Annealed

Annealed

100 (689)
95 (655)

85 (590)a

55 (379)
45 (310)

35 (240)a

39
44

30a

a - minimum

Incoloy 825 - Current Inventory Stock