Metals

Nickel Alloy 825 in Sheet, Plate, and Profiles

SPECIFICATIONS: GRADE Alloy 825 | UNS N08825 | ASTM/ASME B424 / B425 | Werkstoff 2.4858

Castle Metals stocks a wide range of alloy 825 in sheet and plate, from 1.5mm – 50mm thick. With added value processing including water jet, laser, plasma and hi definition plasma, Castle Metals can profile to exact size and shape to specific customer requirements. All material is certified to the highest industry standards, making Castle the perfect partner for demanding supply chain conditions.

 

Chemical Composition (%)

Alloy 825 Ni Cr Fe C Mn Si Cu Mo Al Ti P S
Min 38.0 19.5 bal.       1.5 2.5   0.6    
Max 46.0 23.5 0.05 1.0 0.5 3.0 0.403.5 0.2 1.2 0.020 0.010

Conditional Stress Values

The higher conditional stress values of up to 90% of the yield strength at temperature may be used for applications in which slightly greater deformation is acceptable. These stresses may result in dimensional changes due to permanent strain and are not recommended for flanges of gasketed joints.

Metallurgical Structure

Alloy 825 has a stable face-centred cubic structure. The chemical composition and optimised annealing treatment ensure that corrosion resistance is not impaired by sensitisation.

Corrosion Resistance

Alloy 825 is a versatile general engineering alloy with resistance to corrosion in acids and alkalis under both oxidising and reducing conditions.

High nickel content gives the alloy virtual immunity to stress corrosion cracking.

Corrosion resistance is good in media as diverse as sulphuric, sulphurous, phosphoric, nitric and organic acids, alkalis such as sodium or potassium hydroxide, and aqueous chloride solutions.

The versatility of alloy 825 is illustrated by its use in nuclear fuel element dissolvers where a variety of corrosive media, e.g. sulphuric and nitric acids and sodium hydroxide, are handled in the same equipment.

Country
National
Standards
Material
Designation
Specification
Chem.
Compo-
sition
Tube & Pipe Sheet
&
Plate
Rod
&
Bar
Strip Wire Forgings
Seamless Welded
France
AFNOR
NC21FeDU              
Germany
DIN
VdTÜV
W.-Nr . 2.4858
NiCr21Mo
17744
432
17751
432/2
  17750
432/1
17460
412/434
17750
432/1
  17460
412/434
United
Kingdom
BS
NA 16   3074   3072 3076 3073    
USA
ASTM
ASME
AMS
UNS N08825   B423
SB423
B163
B704/705
SB163
B424
SB424
B425
SB425
B424
SB424
  B564
SB564
ISO NiFe30Cr21Mo3                

The following properties are applicable to alloy 825 in the soft-annealed (stabilising annealed) condition and indicated size ranges.

Specified properties of material outside these size ranges are subject to special enquiry.

Form Dimensions Tensile
Strength
0.2% Yield
Strength
0.2% Yield
Strength
Elong
A5
%
Brinell
Hardness
HB
mm in N/mm2 Ksi N/mm2 Ksi N/mm2 Ksi
Sheet,Strip cr
Plate          hr
0.5-6.4 0.018-0.25 585 85 240 35 265 38 30 ≤ 200
5-100 3/16 -4 585 85 240 35 265 38 30 135-165
Rod, Bar cf
hf
1.6-64 1/16-2.1/2 585 85 240 35 265 38 30 -
25-100 1-4 585 85 240 35 265 38 30 -
> 100-240 >4-9.1/2 550 80 220 32 250 36 35 -
Tube, Pipe hf
cf
64-240 2.1/2-9.1/2 530 75 180 25 - - 30 -
5-100 3/16 -4 585 85 240 35 265 38 30 -
Condenser and
heat exch. tube
16 -76 5/8 -3 585 85 240 35 265 38 30 -

Minimum mechanical properties at room temperature (ASTM) Please Note: The figures quoted are intended for guidance only. For further information, please refer to the standards listed or contact our sales or QA department.

Alloy 825 is used in a wide variety of applications up to a temperature of approximately 550°C (1020°F)

Typical applications include

  • Components such as heating coils, tanks, crates, baskets and chains in sulphuric acid pickling plants
  • Fuel element dissolvers
  • Sea-water-cooled heat exchangers; offshore product piping systems; tubes and components in sour gas service
  • Heat exchangers, evaporators, scrubbers, dip pipes etc. in phosphoric acid production
  • Air-cooled heat exchangers in petroleum refineries
  • Food processing and chemical plant