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
S ≤ 0.010%
Si ≤ 0.50%
C ≤ 0.10%
Mn ≤ 1.00%
Al: 0.90% ~ 1.50%
Ti: 2.00% ~ 2.60%
Cu ≤ 0.50%
Ni + Co ≥ 70.0%
Nb + Ta: 0.70% ~ 1.20%
Nb + Ta: 0.70% ~ 1.20%
Fe: 5.0% ~ 9.0%
Cr: 14.0% ~ 17.0%
Ni + Co ≥ 70.0%
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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
Related Article
More Inconel Grades +
600
S ≤ 0.015%
Si
Si ≤ 0.50%
C
C ≤ 0.15%
Mn
Mn ≤ 1.00%
Cu
Cu ≤ 0.50%
Fe
Fe: 6.0% ~ 10.0%
Cr
Cr: 14.0% ~ 17.0%
Ni
Ni ≥ 72.0%
601
S ≤ 0.015%
Si
Si ≤ 0.50%
C
C ≤ 0.10%
Mn
Mn ≤ 1.00%
Al
Al: 1.00% ~ 1.70%
Cu
Cu ≤ 1.00%
Fe
Fe: 7.7% ~ 17.4%
Cr
Cr: 21.0% ~ 25.0%
Ni
Ni: 58.0% ~ 63.0%
601GC
S ≤ 0.015%
Si
Si ≤ 1.00%
C: 0.03% ~ 0.08%
Mn
Mn ≤ 1.00%
N: 0.02% ~ 0.07%
Zr: 0.070% ~ 0.250%
Al
Al: 0.80% ~ 1.70%
Cu
Cu ≤ 1.00%
Fe
Fe: 6.9% ~ 15.1%
Cr
Cr: 23.0% ~ 25.0%
Ni
Ni: 58.0% ~ 63.0%
602CA
S ≤ 0.010%
Si
Si ≤ 0.50%
C
C: 0.15% ~ 0.25%
Mn ≤ 0.15%
P ≤ 0.020%
Zr: 0.01% ~ 0.10%
Y
Y: 0.05% ~ 0.12%
Al
Al: 1.8% ~ 2.4%
Ti: 0.1% ~ 0.2%
Cu ≤ 0.10%
Fe
Fe: 8.0% ~ 11.0%
Cr
Cr: 24.0% ~ 26.0%
Ni
Ni: 59.2% ~ 65.9%
603XL
Si
Si ≤ 2.00%
C
C ≤ 0.30%
Mn
Mn ≤ 0.30%
Rare Earth ≤ 0.10%
Al
Al ≤ 0.50%
Ti
Ti ≤ 0.50%
Mo
Mo ≤ 4.0%
Cr
Cr: 15.0% ~ 23.0%
Ni
Ni: 69.3% ~ 77.3%
617
S ≤ 0.015%
Si
Si ≤ 1.00%
C
C: 0.05% ~ 0.15%
Mn
Mn ≤ 1.00%
B ≤ 0.006%
Co
Co: 10.0% ~ 15.0%
Al
Al: 0.80% ~ 1.50%
Ti
Ti ≤ 0.60%
Cu
Cu ≤ 0.50%
Fe
Fe ≤ 3.0%
Mo
Mo: 8.0% ~ 10.0%
Cr
Cr: 20.0% ~ 24.0%
Ni
Ni ≥ 44.5%
625
S ≤ 0.015%
Si
Si ≤ 0.50%
C
C ≤ 0.10%
Mn
Mn ≤ 0.50%
P ≤ 0.015%
Co
Co ≤ 1.00%
Nb
Nb + Ta: 3.15% ~ 4.15%
Ta
Nb + Ta: 3.15% ~ 4.15%
Al
Al ≤ 0.40%
Ti
Ti ≤ 0.40%
Fe
Fe ≤ 5.0%
Mo
Mo: 8.0% ~ 10.0%
Cr
Cr: 20.0% ~ 23.0%
Ni
Ni ≥ 58.0%
625LCF
S ≤ 0.015%
Si ≤ 0.15%
C ≤ 0.03%
Mn
Mn ≤ 0.50%
P ≤ 0.015%
N ≤ 0.02%
Co
Co ≤ 1.00%
Nb
Nb + Ta: 3.15% ~ 4.15%
Ta
Nb + Ta: 3.15% ~ 4.15%
Al
Al ≤ 0.40%
Ti
Ti ≤ 0.40%
Fe
Fe ≤ 5.0%
Mo
Mo: 8.0% ~ 10.0%
Cr
Cr: 20.0% ~ 23.0%
Ni
Ni ≥ 58.0%
686
S ≤ 0.020%
Si ≤ 0.08%
C ≤ 0.01%
Mn
Mn ≤ 0.75%
P ≤ 0.040%
W
W: 3.0% ~ 4.4%
Ti: 0.02% ~ 0.25%
Fe
Fe ≤ 5.0%
Mo
Mo: 15.0% ~ 17.0%
Cr
Cr: 19.0% ~ 23.0%
Ni
Ni: 49.5% ~ 62.9%
690
S ≤ 0.015%
Si
Si ≤ 0.50%
C ≤ 0.05%
Mn
Mn ≤ 0.50%
Cu
Cu ≤ 0.50%
Fe
Fe: 7.0% ~ 11.0%
Cr
Cr: 27.0% ~ 31.0%
Ni
Ni ≥ 58.0%
693
S ≤ 0.010%
Si
Si ≤ 0.50%
C
C ≤ 0.15%
Mn
Mn ≤ 1.00%
Nb
Nb: 0.50% ~ 2.50%
Al
Al: 2.50% ~ 4.00%
Ti
Ti ≤ 1.00%
Cu
Cu ≤ 0.50%
Fe
Fe: 2.5% ~ 6.0%
Cr
Cr: 27.0% ~ 31.0%
Ni
Ni: 53.3% ~ 64.3%
706
S ≤ 0.015%
Si
Si ≤ 0.35%
C ≤ 0.06%
Mn
Mn ≤ 0.35%
P ≤ 0.020%
B ≤ 0.006%
Co
Co ≤ 1.00%
Nb
Nb: 2.5% ~ 3.3%
Ta ≤ 0.05%
Al
Al ≤ 0.40%
Ti
Ti: 1.50% ~ 2.00%
Cu
Cu ≤ 0.30%
Fe
Fe ≥ 32.5%
Cr
Cr: 14.5% ~ 17.5%
Ni
Ni: 39.0% ~ 44.0%
718
S ≤ 0.015%
Si
Si ≤ 0.35%
C
C ≤ 0.08%
Mn
Mn ≤ 0.35%
P ≤ 0.015%
B ≤ 0.006%
Co
Co ≤ 1.00%
Nb
Nb + Ta: 4.75% ~ 5.50%
Ta
Nb + Ta: 4.75% ~ 5.50%
Al
Al: 0.20% ~ 0.80%
Ti
Ti: 0.65% ~ 1.15%
Cu
Cu ≤ 0.30%
Fe
Fe: 11.1% ~ 22.5%
Mo
Mo: 2.80% ~ 3.30%
Cr
Cr: 17.0% ~ 21.0%
Ni
Ni: 50.0% ~ 55.0%
718SPF
S ≤ 0.002%
Si
Si ≤ 0.35%
C ≤ 0.05%
Mn
Mn ≤ 0.35%
P ≤ 0.015%
B ≤ 0.006%
N ≤ 0.01%
Co
Co ≤ 1.00%
Nb
Nb: 4.75% ~ 5.25%
Ta ≤ 0.05%
Al
Al: 0.20% ~ 0.80%
Ti
Ti: 0.65% ~ 1.15%
Cu
Cu ≤ 0.30%
Fe
Fe ≥ 11.4%
Mo
Mo: 2.80% ~ 3.30%
Cr
Cr: 17.0% ~ 21.0%
Ni
Ni: 50.0% ~ 55.0%
725
S ≤ 0.010%
Si
Si ≤ 0.20%
C ≤ 0.03%
Mn
Mn ≤ 0.35%
P ≤ 0.015%
Nb
Nb: 2.75% ~ 4.00%
Al
Al ≤ 0.35%
Ti
Ti: 1.00% ~ 1.70%
Fe
Fe: 2.3% ~ 14.3%
Mo
Mo: 7.0% ~ 9.5%
Cr
Cr: 19.0% ~ 22.5%
Ni
Ni: 55.0% ~ 59.0%
740H
S ≤ 0.030%
Si
Si ≤ 1.00%
C: 0.005% ~ 0.080%
Mn
Mn ≤ 1.00%
P ≤ 0.030%
B: 0.0006% ~ 0.0060%
Co
Co: 15.0% ~ 22.0%
Nb
Nb + Ta: 0.50% ~ 2.50%
Ta
Nb + Ta: 0.50% ~ 2.50%
Al
Al: 0.20% ~ 2.00%
Ti
Ti: 0.50% ~ 2.50%
Cu
Cu ≤ 0.50%
Fe
Fe ≤ 3.00%
Mo
Mo ≤ 2.0%
Cr
Cr: 23.5% ~ 25.5%
Ni
Ni ≥ 37.9%
X-750
S ≤ 0.010%
Si
Si ≤ 0.50%
C
C ≤ 0.08%
Mn
Mn ≤ 1.00%
Co
Co ≤ 1.00%
Nb + Ta: 0.70% ~ 1.20%
Nb + Ta: 0.70% ~ 1.20%
Al
Al: 0.40% ~ 1.00%
Ti
Ti: 2.25% ~ 2.75%
Cu
Cu ≤ 0.50%
Fe
Fe: 5.0% ~ 9.0%
Cr
Cr: 14.0% ~ 17.0%
Ni
Ni ≥ 70.0%
751
S ≤ 0.010%
Si
Si ≤ 0.50%
C
C ≤ 0.10%
Mn
Mn ≤ 1.00%
Co
Ni + Co ≥ 70.0%
Nb + Ta: 0.70% ~ 1.20%
Nb + Ta: 0.70% ~ 1.20%
Al
Al: 0.90% ~ 1.50%
Ti
Ti: 2.00% ~ 2.60%
Cu
Cu ≤ 0.50%
Fe
Fe: 5.0% ~ 9.0%
Cr
Cr: 14.0% ~ 17.0%
Ni
Ni + Co ≥ 70.0%
MA754
C ≤ 0.05%
Y2O3
Y2O3 ≈ 0.60%
Al
Al ≤ 0.30%
Ti
Ti ≤ 0.50%
Fe
Fe ≤ 1.0%
Cr
Cr ≈ 20.0%
Ni
Ni ≈ 78.0%
MA758
C ≤ 0.05%
Y2O3
Y2O3 ≈ 0.60%
Al
Al ≤ 0.30%
Ti
Ti ≤ 0.50%
Fe
Fe ≤ 1.0%
Cr
Cr ≈ 30.0%
Ni
Ni ≈ 67.6%
783
S ≤ 0.005%
Si
Si ≤ 0.50%
C ≤ 0.03%
Mn
Mn ≤ 0.50%
P ≤ 0.015%
B: 0.003% ~ 0.012%
Co
Co ≥ 28.0%
Nb
Nb: 2.50% ~ 3.50%
Ta ≤ 0.05%
Al
Al: 5.00% ~ 6.00%
Ti
Ti ≤ 0.40%
Cu
Cu ≤ 0.50%
Fe
Fe: 24.0% ~ 27.0%
Cr
Cr: 2.5% ~ 3.5%
Ni
Ni: 26.0% ~ 30.0%