X-750
High-Temp SteelX-750
Precipitation-hardening Ni-base, springs & bolts. (ASTM B637; equiv UNS N07750 / AMS 5667). Nominal values—confirm mill certificate.
Chemical Composition (%)
| NI | 70 |
|---|---|
| CR | 14 |
| FE | 5 |
| TI | 2.25 |
| AL | 0.4 |
| NB+TA | 0.7 |
| C | 0.08 |
| MN | 1 |
| SI | 0.5 |
Mechanical Properties
Tensile(aged):≥1170 MPa;Yield(aged):≥760 MPa;Elong:≥15%
Chinese Standard
ASTM B637 X-750
Equivalent Standards
AMS 5667
Equivalent Grades
UNS N07750
Applications
沉淀硬化镍基，弹簧螺栓。,"Bar
Available Forms
Strip"
Uses
Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Used in gas-turbine blades, aero-engine hot sections, combustors and advanced energy systems.
Heat Treatment
Solution treated 1050–1250 °C and aged (≈700–900 °C) to precipitate γ′/γ″ strengtheners; processed via vacuum induction + VAR/ESR for cleanliness.
Precautions
Machining is difficult — use ceramic/PCBN tools, generous coolant and rigid setups. Keep clean (vacuum/inert melting) to avoid inclusions; avoid contamination by low-melting elements.
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