Inconel 725(UNS  N07725)

1.Inconel 725 INTRODUCTION

A nickel-chromium-molybdenum-niobium  alloy that is highly resistant to corrosion and  is age hardenable for extremely high strength.  The strength of this alloy is developed by heat  treatment to achieve high ductility and toughness.  The alloy is resistant to hydrogen embrittlement  and stress-corrosion cracking. Used for hangers,  landing nipples, side pocket mandrels and polished  bore receptacles in sour gas service. Also used for  high-strength fasteners in marine applications.

2.Inconel 725 STANDARD  PRODUCT FORMS

Round bar and wire.

3.Inconel 725 MAJOR  SPECIFICATIONS

UNS N07725 

ASTM B 805 

ASME Code Case 2217 

NACE MR-0175/ISO 15156 

SMC HA91

4.Inconel 725 LIMITING CHEMICAL  COMPOSITION, %

Ni......55.0 – 59.0 

Cr......19.0 – 22.5 

Mo......... 7.0 – 9.5 

Nb ...... 2.75 – 4.0 

Ti ...........1.0 – 1.7 

Al .........0.35 max. 

C..........0.03 max.  

Mn.......0.35 max. 

Si.........0.20 max. 

P........ 0.015 max. 

S....... 0.010 max. 

Fe........... Balance

5.Inconel 725 PHYSICAL CONSTANTS  AND THERMAL  PROPERTIES

Density, Ib/in3 .........................................................................0.300 

g/cm3 ......................................................................... 8.31 

Melting Point, °F.....................................................2320 – 2449 

°C.....................................................1271 – 1343

Permeability at 200 Oersted (15.9 kA/m)................. <1.001 

Coefficient of Expansion, 70 – 200°F, 10-6 in/in •°F......7.22 

20 – 100°C, μm/m •°C......... 13.0 

Thermal Conductivity, Btu • in/ft2• h•°F.......................... 73.8 

W/m•°C.......................................... 10.6

Electrical Resistivity, ohm • circ mil/ft............................. 688

μΩ•m..............................................1.144

6.Inconel 725 TYPICAL MECHANICAL  PROPERTIES