Incoloy 825 –   Incoloy 825 Nickel-Chromium Alloy  

 

Incoloy 825 – Nickel-Chromium Alloy

Incoloy 825 is a Nickel-Iron-Chromium alloy with additions of Molybdenum and Copper. It has excellent resistance to both reducing and oxidising acids, to stress-corrosion cracking and to localised pitting and crevice corrosion. It is also especially resistant to sulphuric and phosphoric acids.

Chemical Composition of Incoloy 825

The compositional range for Incoloy 825 is provided in the table below.

Element

Content

Ni

38 - 46 %

Fe

22 % min

Cr

19.5 - 23.5%

Mo

2.5 - 3.5 %

Cu

1.5 3 %

Ti

0.6 - 1.2 %

 

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Typical Properties of Incoloy 825

Typical properties of Incoloy 825 are covered in the following table.

Property

Metric

Imperial

Density

8.14 g/cm3

0.294 lb/in3

Melting point

1400°C

2550°F

Co-Efficient of Expansion

14.0 µm/m.°C
(20-100 °C)

7.8x10-6 in/in.°F
(70-212 °F)

Modulus of rigidity

75.9 kN/mm2

11009 ksi

Modulus of elasticity

196 kN/mm2

28428 ksi

Properties of Supplied Materials and Heat Treated Materials

Condition of Supply

Heat Treatment (After Forming)

Spring Temper/Spring Temper

Stress relieve at 450 - 470°C (840 - 880°F) for 30-60 minutes and air cool.

Condition

Approx Tensile Strength

Approx Service Temp.

Annealed

600 - 800 N/mm2

87 -116 ksi

-100° to +250°C

-145° to +480°F

Spring Temper

800 - 1000 N/mm2

116 - 159 ksi

-100° to +250°C

-145° to +480°F

Relevant Standards

Incoloy 825 is covered by the following standards:

  • BS 3076 NA 16
  • ASTM B425

Equivalent Materials

Incoloy 825 is the tradename of Special Metals Group of Companies and equivalent to:

  • NR 2.4858
  • UNS N08825
  • AWS 022

Applications of Incoloy 825

Incoloy 825 typically finds application in:

  • Chemical Processing
  • Nuclear Fuel Reprocessing
  • Acid Production
  • Pickling Equipment

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Availability:

 

 

 
 

Incoloy 825 Plate

Incoloy 825 Fittings

Incoloy 825 Tube / Pipe

 

 

 

 

 

Incoloy 825 Bar

Incoloy 825 Sheet

Incoloy 825 Coil /Strap

 

 

 

 

 

Incoloy 825 Fasteners / Flanges

Incoloy 825 Powder

Incoloy 825 Welding Product

 

 

 

 

 

 

Nickel Alloy 825/ Incoloy 825®


Technical Data Sheet

Chemical Composition Limits

Weight %

Ni

Fe

Cr

Mo

Cu

Ti

C

Mn

S

Si

Al

Alloy 825

38 - 46

22 min

19.5 - 23.5

2.5 - 3.5

1.5 - 3

0.6 - 1.2

0.05 max

1 max

0.03 max

0.5 max

0.2 max

Alloy 825 is a nickel-iron-chromium alloy with additions of molybdenum and copper. It has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localised attack such as pitting and crevice corrosion. Alloy 825 is especially resistant to sulphuric and phosphoric acid. Alloy 825 is used for chemical processing, pollution control equipment, oil and gas well piping, nuclear fuel reprocessing, acid production and pickling equipment and handling of radioactive wastes. 

Typical Mechanical Properties

Material

Form and Condition

Tensile Strength MPa

Yield Strength (0.2% Offset) MPa

Elongation (%)

Alloy 825 Tube

Annealed

772

441

36

Alloy 825 Tube

Cold Drawn

1000

889

15

Alloy 825 Bar

Annealed

690

324

45

Alloy 825 Plate

Annealed

662

338

45

Alloy 825 Sheet

Annealed

758

421

39

 

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Specifications
UNS N08825
WS 2.458
FMC Spec M41104, M40116, M40154
NACE MR-0175/ISO 15156

Alloy 825 Sheet, Strip and Plate
BS3072 NA16
BS 3073 NA16
ASTM B 424
ASTM B 906
ASME SB 424
ASME SB 906
DIN 17750
VdTUV 432

Alloy 825 Pipe and Tube
BS 3074 NA16
ASTM B163, ASME SB 163
ASTM B 423, ASME SB 423
ASTM B704, ASME SB 704
ASTM B 705, ASME SB 705
ASTM B 751, ASME SB 751
ASTM B 755, ASME SB 755
ASTM B 829, ASME SB 829
DIN 17751, VdTUV 432

Alloy 825 Rod, Bars, Forgings
BS 3076 NA16
ASTM B 425
ASTM B 564
ASME SB 425
ASME SB 564
ASME Code Case N-572
DIN 17752, DIN 17753, DIN 17754
VdTUV 432

Other Similar Specifications

ASTM B366
ASME SB 366
DIN 17744 

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 Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.