Hangbo Alloy Group
Shanghai · Est. 2012
N07700 technical guide: nominal chemical composition, mechanical and physical properties, corrosion resistance, welding, product forms and ASTM standards...
Udimet 700 (UNS N07700) is a nickel-chromium-cobalt superalloy (γ′). Among the strongest wrought γ′ superalloys. High Al/Ti for max precipitate strength. This guide covers its nominal chemical composition, typical mechanical and physical properties, corrosion behaviour, welding, common applications, available product forms and the ASTM standards that apply — everything a specifier needs to evaluate Udimet 700 for a project.
Udimet 700 belongs to the nickel-chromium-cobalt superalloy (γ′) class of materials. It is among the strongest wrought γ′ superalloys. It is high al/ti for max precipitate strength. It is hot-section blades & vanes to 800 °c.
Nominal (wt%) composition of Udimet 700 (UNS N07700):
| Element | Composition (wt%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 13.0 – 17.0 |
| Cobalt (Co) | 15.0 – 22.0 |
| Molybdenum (Mo) | 4.0 – 6.0 |
| Aluminium (Al) | 3.2 – 4.2 |
| Titanium (Ti) | 3.2 – 4.2 |
| Iron (Fe) | ≤ 1.0 |
| Carbon (C) | 0.07 – 0.15 |
| Boron (B) | ≤ 0.010 |
| Zirconium (Zr) | ≤ 0.10 |
Typical physical properties:
| Property | Value |
|---|---|
| Density | 7.95 g/cm³ |
| Melting Range | 1280 – 1340 °C |
| Thermal Expansion (20–1000 °C) | 14.5 µm/m·K |
| Thermal Conductivity (100 °C) | 11.5 W/m·K |
| Modulus of Elasticity | 210 GPa |
Typical room-temperature mechanical properties (annealed / specified condition unless noted):
| Property | Typical Value |
|---|---|
| Tensile Strength (Rm), aged | 1250 MPa (181 ksi) |
| Yield Strength, 0.2% (Rp0.2), aged | 900 MPa (131 ksi) |
| Elongation, aged | 12% |
| Hardness (Rockwell C), aged | 36 – 46 HRC |
| Property | Value |
|---|---|
| Creep rupture at 760 °C / 1000 h | ≈ 300 MPa |
| Service temperature | Up to 800 °C |
Udimet 700 is one of the strongest wrought γ′-strengthened Ni-Cr-Co superalloys, with high aluminium/titanium for maximum precipitate strengthening and good oxidation resistance to about 800 °C. It is used where the highest turbine hot-section strength is required.
Repair-welded with matching/overalloyed fillers under a strict qualified procedure (solution treat + age). Fabrication follows turbine OEM specifications; not a general fabrication alloy.
The grade is supplied to the following common specifications:
| Standard | Product Form / Scope |
|---|---|
| AMS 5705 | Bars & forgings reference |
| OEM turbine specs | PWA / GE / Rolls-Royce |
Standards & References. Specifications cited on this page; confirm current revisions with the issuing body.
General references: Nickel Institute · AMPP (corrosion) · SAE International · ASTM International
Udimet 700 (UNS N07700) is one of the strongest wrought γ′-strengthened Ni-Cr-Co superalloys, with high aluminium/titanium for maximum precipitate strengthening and good oxidation resistance to about 800 °C. It is used where the highest turbine hot-section strength is needed.
Aged: ≈ 1250 MPa tensile, ≈ 900 MPa yield, 12 % elongation, 36–46 HRC, with creep-rupture strength near 300 MPa at 760 °C / 1000 h.
Yes for repair, with matching/overalloyed fillers under a strict qualified procedure (solution treat + age), per turbine OEM specs. It is not a general fabrication alloy.
Gas-turbine blades and vanes, aero-engine high-strength rotating parts, industrial turbine hot-section components and high-temperature bolting.
700 is the highest-strength, highest-temperature grade of the family (to ~800 °C); 500/520/630 cover slightly lower-temperature disc/blade duties with more ductility.
Bars/forgings referenced under AMS 5705, with most production governed by OEM turbine specifications.
As a dedicated nickel alloy manufacturer serving aerospace, power generation sectors, Hangbo Alloy Group supplies the grades discussed here across all standard product forms with full ASTM/ASME documentation and EN 10204 3.1 certification. Our material is specified for applications where corrosion resistance, high-temperature strength, and traceable quality are non-negotiable. See our production & testing facilities for more on how every heat is verified.