Inconel Alloy
751
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Inconel 751 Introduction
Precipitation
Strengthened Alloy
Resistance
Behavior
Overview
As a leading supplier & manufacturer in China, AEETHER supply cost-effective Inconel 751 Products.
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
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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