Incoloy 825(UNS N08825 W.Nr.2.4858)

1.Incoloy 825 INTRODUCTION

A nickel-iron-chromium alloy with additions  of molybdenum and copper. It has excellent  resistance to both reducing and oxidizing  acids, stress-corrosion cracking and localized  attack such as pitting and crevice corrosion.  The alloy is especially resistant to sulfuric  and phosphoric acids. Used for chemical  processing, pollution-control equipment, oil  and gas well piping, nuclear fuel reprocessing,  acid production and pickling equipment.

2.Incoloy 825 STANDARD  PRODUCT FORMS

Pipe, tube, sheet, strip, plate, round bar, flat bar, forging  stock, hexagon and wire.

3.Incoloy 825 MAJOR  SPECIFICATIONS

UNS N08825

BS 3072 – BS 3074, 3076 (NA16) 

ASTM B 163, B 366,   B 423 – B 425, B 564, B 704,   B 705, B 751, B 775, B 829 

Werkstoff Nr. 2.4858 VdTüV 432 

NACE MR-0175/ISO 15156 

ASME SB-163, SB-366,   SB-423 – SB-425, SB-564,   SB-704, SB-705, SB-751,   SB-775, SB-829 

ASME Code Cases 1936, N-572 

DIN 17744, 17750 – 17754 ISO 6207, 6208, 9723 – 9725

4.Incoloy 825 LIMITING CHEMICAL  COMPOSITION, %

Ni......38.0 – 46.0 

Fe.........22.0 min.  

Cr .....19.5 – 23.5 

Mo.........2.5 – 3.5 

Cu..........1.5 – 3.0 

Ti ...........0.6 – 1.2 

C..........0.05 max. 

Mn......... 1.0 max. 

S..........0.03 max. 

Si........... 0.5 max. 

Al ........... 0.2 max.

5.Incoloy 825 PHYSICAL CONSTANTS  AND THERMAL  PROPERTIES

Density, Ib/in3 ........................................................................0.294 

g/cm3 ......................................................................... 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 

Coefficient of Expansion, 10-6 in/in•°F (μm/m•°C) 

70-200°F (21-93°C)........................ 7.8 (14.0) 

Thermal ConductivityA , Btu•in/ft2•h•°F................................... 76.8 

W/m•°C................................................. 11.1 

Electrical ResistivityA , ohm•circ mil/ft....................................678 

μΩ•m....................................................1.13

6.Incoloy 825 TYPICAL MECHANICAL  PROPERTIES