Inconel Alloy
751
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Inconel 751 Introduction
Precipitation
Strengthened Alloy
Resistance
Behavior
Overview
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INCONEL® alloy 751 (UNS N07751) is a precipitation hardenable nickel-chromium alloy, used mainly for the exhaust valves of internal combustion engines. Its thermal properties correspond closely to those published for INCONEL alloy X-750.
In the evaluation of materials for exhaust valve applications, nickel-chromium alloys have performed well in a 1675°F (913°C) lead oxide screening test. INCONEL alloy 751 repeatedly offered good results, with corrosion rates averaging 4.31 g/dm2/h. Like other nickel-chromium alloys, INCONEL alloy 751 also resists attack by other exhaust stream impurities such as sulfur, bromine and chlorine.
The hot working range for INCONEL alloy 751 is 1800- 2200°F (980-1205°C). The alloy should be reheated to 2200°F (1205°C) whenever its temperature falls below 1800°F (980°C).
INCONEL alloy 751 is readily machined in the as-hot finished condition. The best procedure is to machine to slightly oversize, precipitation heat treat, then finish to size. A slight permanent contraction (about 0.0003 in/in) takes place during precipitation. Precipitation treated material can be finish machined to fine finishes and close tolerances, and will have good dimensional stability.
Inconel 751 Chemical Composition
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Data Sheet
Physical Properties
| Density | g/cm3 | 8.22 | |
|---|---|---|---|
| lb/in.3 | 0.297 | ||
| Melting Range | °F | 2540 - 2600 | |
| °C | 1390 - 1430 | ||
| Specific Heat | Btu/lb-°F | 0.103 | |
| J/kg-°C | 431 | ||
| Electrical Resistivity | ohm-circ mil/ft | 731 | |
| μΩ-m | 1.22 | ||
| Curie Temperature | °F | -193 | |
| °C | -125 | ||
| Permeability at 200 oersted | 15.9 kA/m | 1.0035 | |
Mechanical Properties
| Temperature | Tensile Strength | Yield Strength (0.2% Offset) |
Elongation | Reduction of Area | Hardness | |||
|---|---|---|---|---|---|---|---|---|
| °F | °C | ksi | MPa | ksi | MPa | % | % | BHN |
| Room | Room | 141.5 | 976 | 190.0 | 1310 | 22.5 | 38.2 | 352 |
| 1200 | 649 | 128.9 | 889 | 159.6 | 1100 | 22.5 | 32.1 | 291 |
| 1350 | 732 | 113.5 | 783 | 124.8 | 860 | 18.5 | 25.7 | 235 |
| 1500 | 816 | 76.3 | 526 | 80.3 | 554 | 26.0 | 35.9 | 173 |
Inconel 751 Applications
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