Hangbo Alloy Group
Shanghai · Est. 2012
N07520 technical guide: nominal chemical composition, mechanical and physical properties, corrosion resistance, welding, product forms and ASTM standards...
Udimet 520 (UNS N07520) is a nickel-chromium-cobalt superalloy (γ′). Higher-Mo, higher-strength Udimet 500 successor. Strong creep/rupture to 750 °C. 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 520 for a project.
Udimet 520 belongs to the nickel-chromium-cobalt superalloy (γ′) class of materials. It is higher-mo, higher-strength udimet 500 successor. It is strong creep/rupture to 750 °c. It is gas-turbine disc & blade alloy.
Nominal (wt%) composition of Udimet 520 (UNS N07520):
| Element | Composition (wt%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 15.0 – 20.0 |
| Cobalt (Co) | 11.0 – 15.0 |
| Molybdenum (Mo) | 4.0 – 6.0 |
| Aluminium (Al) | 1.8 – 2.5 |
| Titanium (Ti) | 2.6 – 3.3 |
| Iron (Fe) | ≤ 3.0 |
| Carbon (C) | 0.03 – 0.08 |
| Boron (B) | ≤ 0.010 |
| Zirconium (Zr) | ≤ 0.10 |
Typical physical properties:
| Property | Value |
|---|---|
| Density | 8.05 g/cm³ |
| Melting Range | 1300 – 1360 °C |
| Thermal Expansion (20–1000 °C) | 14.0 µm/m·K |
| Thermal Conductivity (100 °C) | 11.5 W/m·K |
| Modulus of Elasticity | 208 GPa |
Typical room-temperature mechanical properties (annealed / specified condition unless noted):
| Property | Typical Value |
|---|---|
| Tensile Strength (Rm), aged | 1180 MPa (171 ksi) |
| Yield Strength, 0.2% (Rp0.2), aged | 850 MPa (123 ksi) |
| Elongation, aged | 14% |
| Hardness (Rockwell C), aged | 34 – 44 HRC |
| Property | Value |
|---|---|
| Creep rupture at 650 °C / 1000 h | ≈ 420 MPa |
| Service temperature | Up to 750 °C |
Udimet 520 is a higher-molybdenum, higher-strength development of Udimet 500 for gas-turbine discs and blades. The extra molybdenum and refined γ′ content raise creep and rupture strength while keeping good oxidation and fatigue resistance in the 650–750 °C range.
Repair-welded with matching/overalloyed fillers under a strict qualified procedure (solution treat + age). Fabrication follows turbine OEM specifications.
The grade is supplied to the following common specifications:
| Standard | Product Form / Scope |
|---|---|
| AMS 5752 | Bars & forgings |
| 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 520 (UNS N07520) is a higher-molybdenum, higher-strength development of Udimet 500 for gas-turbine discs and blades, with improved creep and rupture strength to about 750 °C while keeping good oxidation and fatigue resistance.
Aged: ≈ 1180 MPa tensile, ≈ 850 MPa yield, 14 % elongation, 34–44 HRC, with creep-rupture strength near 420 MPa at 650 °C / 1000 h.
520 adds molybdenum (4–6 % vs 3–5 %) and raises strength/creep capability while remaining in the same family. 500 is the baseline; 520 is the higher-performance derivative.
Yes, with matching/overalloyed fillers under a strict qualified procedure including solution treat and age, per turbine OEM specs.
Gas-turbine discs and blades, aero-engine rotating parts, industrial turbine hot-section components and high-temperature bolting.
Bars/forgings AMS 5752, with most production governed by OEM turbine specifications (PWA, GE, Rolls-Royce).
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.