Inconel 751(UNS N07751)

1.Inconel 751 INTRODUCTION

A nickel-chromium alloy similar to INCONEL  alloy X-750 but with increased aluminum  content for greater precipitation hardening.  This alloy was designed for use as exhaust  valves in internal-combustion engines. In that  application, the alloy offers high strength at  operating temperatures, high hot hardness for  wear resistance, and corrosion resistance in  hot exhaust gases containing lead oxide, sulfur,  bromine and chlorine.

2.Inconel 751STANDARD  PRODUCT FORMS

Round bar.

3.Inconel 751 MAJOR  SPECIFICATIONS

UNS N07751

4.Inconel 751 LIMITING CHEMICAL  COMPOSITION, %

Limiting 

Ni .........70.0 min. 

Cr...... 14.0 – 17.0 

Fe..........5.0 – 9.0

Plus Co. 

 Plus Ta. 

Ti ............2.0 – 2.6

Al ............0.9 – 1.5 

Nb.........0.7 – 1.2 

C..........0.10 max. 

Mn......... 1.0 max. 

Si........... 0.5 max. 

S..........0.01 max. 

Cu........0.05 max

5.Inconel 751 PHYSICAL CONSTANTS  AND THERMAL  PROPERTIES

Density, Ib/in3 .........................................................................0.297

g/cm3 ......................................................................... 8.22 

Melting Point, °F.....................................................2540 – 2600

°C.....................................................1390 – 1430

Specific Heat, Btu/lb •°F....................................................0.103

J/kg •°C.......................................................... 431

Curie Temperature, °F.......................................................... -193 

°C ......................................................... -125 

Permeability at 200 Oersted (15.9 kA/m)................. 1.0035 

Coefficient of Expansion, 70 – 200°F, 10-6 in/in •°F........ 7.0

21 – 93°C, μm/m •°C............ 12.6 

Thermal Conductivity, Btu • in/ft2• h•°F..............................83 

W/m•°C.......................................... 12.0 

Electrical Resistivity, ohm • circ mil/ft............................. 731 

μΩ•m................................................ 1.22

6.Inconel 751 TYPICAL MECHANICAL  PROPERTIES