Inconel 825

Inconel 825 | UNS N08825 | WS 2.458 | DIN 17750 | VdTUV 432 | ASTM B 906 | FMC Spec M41104 | BS 3074 NA16 | ASME SB 163

Inconel alloy 825 (UNS N08825/W.Nr. 2.4858) is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. The alloy’s chemical composition, is designed to provide exceptional resistance to many corrosive environments. The nickel content is sufficient for resistance to chloride-ion stress-corrosion cracking. The nickel, in conjunction with the molybdenum and copper, also gives outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acids. The molybdenum also aids resistance to pitting and crevice corrosion. The alloy’s chromium content confers resistance to a variety of oxidizing substances such as nitric acid, nitrates and oxidizing salt. The titanium addition serves, with an appropriate heat treatment, to stabilize the alloy against sensitization to intergranular corrosion.
The resistance of INCOLOY alloy 825 to general and localized corrosion under diverse conditions gives the alloy broad usefulness. Applications include chemical processing, pollution control, oil and gas recovery, acid production, pickling operations, nuclear fuel reprocessing, and handling of radioactive wastes. Applications for alloy 825 are similar to those for INCOLOY alloy 020.

Chemical Composition

Nickel ………………………………………………………………..38.0-46.0
Iron…………………………………………………………………….22.0 min.
Chromium…………………………………………………………..19.5-23.5
Molybdenum ………………………………………………………….2.5-3.5
Copper ………………………………………………………………….1.5-3.0
Titanium…………………………………………………………………0.6-1.2
Carbon………………………………………………………………0.05 max.
Manganese ………………………………………………………….1.0 max.
Sulfur ………………………………………………………………..0.03 max.
Silicon …………………………………………………………………0.5 max.
Aluminum…………………………………………………………….0.2 max.
Physical Constants and Thermal Properties
Some physical constants for INCOLOY alloy 825 are listed. Values for thermal expansion, thermal conductivity, and electrical resistivity at various temperatures. Modulus of elasticity and Poisson’s ratio over a range of temperatures are given . Modulus values, which were determined dynamically, were used to compute Poisson’s ratio.

Physical Constants

Density, lb/in3 ……………………………………………………………0.294
               Mg/m3 …………………………………………………………..8.14
Melting Range, °F ……………………………………………………….2500-2550
                             °C ……………………………………………………….1370-1400
Specific Heat, Btu/lb•°F ……………………………………………….0.105
                              J/kg•°C………………………………………………..440
Curie Temperature, °F………………………………………………….<-320
                                     °C …………………………………………………<-196
Permeability at 200 oersted (15.9 kA/m)…………………………1.005

Availability

Alloy 825 is available in Sheet, Plate, Strip, Pipe, Tube, Rod, Round Bar Flat Bar, Hexagon, Wire and Forging Stock. View Stock List, Plate Stock List or contact Sales for further availability.

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

Similar Specifications

ASTM B366
ASME SB 366
DIN 17744

© FountainHead Alloys 1996