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Alloy GH4145, also known as Inconel X 750, is a precipitation-hardenable nickel-chromium alloy used for its corrosion and oxidation resistance and high strength at temperatures up to 700℃. Although much of the effect of precipitation hardening is lost with increasing temperature over 700℃, heat-treated material has useful strength up to 980℃. Alloy GH4145 also has excellent properties down to cryogenic temperatures. This alloy demonstrates the advanced capabilities of modern super alloy manufacturers in engineering superior wrought and cast alloys that maintain structural integrity across extreme temperature ranges from cryogenic environments to high-heat conditions.
Similar alloy's names in different standards:
Beiye designation | China Standard designation | American designation | French designation | German designation | Japanese designation |
GH4145 | GH4145 | Inconel X-750 | NC15FeTNbA | NiCr15Fe7TiAl | NCF750 |
Rotor blades and wheels
Rocket-engine thrust chambers
Thrust reversers
Hot-air ducting systems
Heat-treating fixtures
Forming tools
Test machine grips
C | 0.04 | Cr | 16.00 |
Fe | 7.50 | Nb | 1.00 |
| Al | 0.95 | Ti | 2.60 |
| Ni | bal. |
| Solution | Solution+Aging | |
Hardness | — | 42HRC |
Tensile Strength | 883MPa (128.2 ksi) | 1373 MPa (199.3 ksi) |
| Elongation | 33% | 20% |
* Typical values for material tested in accordance with GB/T 4340.3, GB/T 228, GB/T 22315.
Density | 8.28 g/cm3 (0.299b/in3) | ||
Melting Point | 1393 ℃ (2540oF) | ||
Curie temperature (As Hot-Rolled) | -143 ℃ (-225oF) | ||
(Triple-heat-treated 2100 oF/2 hr, A.C., +1500 oF/24hr, A.C., +1300 oF/20hr, A.C.) | -124℃(-193 oF) | ||
Modulus of elasticity (27℃, Tension) | 31×103ksi | ||
(27℃, Torsion) | 11×103ksi | ||
Poisson's rato (21℃) | 0.29 | ||
Alloy GH4145 may be given any one of a variety of heat treatments. Each develops special Inconel X 750 properties and puts the product in the best condition for its intended application. In general, the intermediate heat treatment systems of materials and components are as follows.
Annealing: 955～1010℃, WQ.
Weldments annealing before welding: 980℃, 1h.
Weldments stress relieving annealing: 900℃, 2h.
Stress relieving annealing: 885℃±15℃, 24h, AC.
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