Inconel X750* Specification
*Trade name of Special Metals Group of Companies
- W.NR 2.4669
- UNS N07750
- AWS 014
Applicable Standards:
- AMS 5667
- AMS 5699 (Spring Temper)
- AMS 5698 (No 1 Spring Temper)
- ASTM B637
- NACE MR0175 / ISO 15156-3
X750 is a Nickel-Chromium alloy made precipitation hardenable by additions of Al and Ti, having creep-rupture strength at high temperatures to about 700oC (1290oF). It is widely used for high temperature conditions but is not as strong as Nimonic 90. View X-750 Standard Stock Sizes
| Good Mechanical Properties at Elevated Temperatures | Yes |
| Corrosion Resistant at Ambient Temperatures | Yes |
| Corrosion Resistant & Good Mechanical Properties at Elevated Temperatures | Yes |
| Oxidation Resistant | Yes |
| Precipitation Hardenable | Yes |
Applications include:
- Nuclear reactors
- Gas turbines
- Rocket engines
- Pressure vessels
- Aircraft structures
| Approximate Chemical Composition | |
| Ni + Co | 70% Minimum |
| Cr | 14 - 17% |
| Fe | 5 - 9% |
| Ti | 2.25 - 2.75% |
| Al | 0.4 - 1.0% |
| Nb + Ta | 0.7 - 1.2% |
| Properties | |||
| DENSITY | 8.28 g/cm3 | 0.299 lb/in3 | |
| MELTING POINT | 1430 oC | 2600 oF | |
| COEFFICIENT OF EXPANSION | 12.6 µm/m °C (20 - 100°C) |
7.0 x 10-6
in/in °F (70 - 212°F) |
|
| MODULUS OF RIGIDITY | 75.8 kN/mm2 | 10994 ksi | |
| MODULUS OF ELASTICITY | * ** *** |
218.0 kN/mm2 212.4 kN/mm2 213.7 kN/mm2 |
31619 ksi 30806 ksi 30995 ksi |
*Spring Temper + Aged **Spring Temper + 3 Part Heat Treated
*** No.1 Spring Temper + Aged
| CONDITION OF SUPPLY | HEAT TREATMENT (AFTER FORMING) |
| Spring Temper | Age harden at 650oC (1200oF) for 4 hours and air cool. |
| Spring Temper | 3 Part Heat Treatment: 1. Solution Anneal at 1150ºC (2100ºF) for 2 hours and air cool † 2. and Stabilise at 843ºC (1550ºF) for 24 hours and air cool 3. and Age harden at 704ºC (1300ºF) for 20 hours and air cool |
| No 1 Spring Temper | Age harden at 730ºC (1350ºF) for 16 hours and air cool |
† for diameters below 1.00mm contact AWI quality department.
| CONDITION | APPROX TENSILE STRENGTH | APPROX SERVICE TEMPERATURE | ||
| Annealed | 800 - 1000 N/mm2 | 116 - 145 ksi | ||
| Spring Temper | 1100 - 1500 N/mm2 | 159 - 217 ksi | ||
| Spring Temper +
Aged |
1350 - 1750 N/mm2 | 196 - 254 ksi | -200 to +370 ºC | -330 up to +700 ºF |
| Spring Temper + 3 Part heat treated | 1100 - 1250 N/mm2 | 159 - 181 ksi | -200 to +550 ºC | -330 up to +1020 ºF |
| No 1 Spring Temper | 900 - 1150 N/mm2 | 130 - 167 ksi | ||
| No 1 Spring Temper + Aged | 1300 - 1450 N/mm2 | 188 - 210 ksi | -200 to +550 ºC | -330 up to +1020 ºF |
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