Inconel X-750 alloy is mainly a nickel-based superalloy with γ"[Ni3(Al, Ti, Nb)] phase for ageing strengthening. It has good corrosion resistance and oxidation resistance below 980 ºC, and has high corrosion resistance below 800 ºC. It has good relaxation resistance below 540 °C, and also has good formability and welding performance. The alloy is mainly used to manufacture aero-engines that work below 800 °C and require high strength. Relaxation-resistant flat springs and Coil spring. It can also be used to manufacture steam turbine turbine blades and other parts. The varieties available are sheet, strip, bar, forging, ring, wire and tube.
Chemical composition:
C Cr Ni+Co Al Ti Fe Nb+Ta
≤0.08 14.0~17.0 ≥70.0 0.40~1.00 2.25~2.75 5.00~9.00 0.70~1.20
Co Mn Si S Cu P
no greater than 1.00 no greater than 1.00 no greater than 0.50 no greater than 0.010 no greater than 0.50 no greater than 0.015
Note: Mn and Si in the table are the contents of rods, forgings, rings and wires. Plates, strips and pipes are: Mn≤0.35%, Si≤0.35%.
Processing Technology:
The solution heat treatment system for plates, strips and pipes in the supply state is 980°C ± 15°C, air-cooled. For the intermediate heat treatment system of materials and parts, the following processes can be selected for heat treatment.
Annealing: 955~1010ºC, water cooling.
Annealing of welded parts before welding: 980ºC, 1h.
Stress relief annealing of welded parts: 900ºC, moisturizing for 2h.
Stress relief annealing: 885ºC±15ºC, 24h, air cooling.
Inconel X-750 similar grades
Inconel X-750 (USA), NiCr15Fe7TiAl (Germany), NC15FeTNbA (France), NCF750 (Japan)
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