Hangbo Alloy Group
Shanghai · Est. 2012
N07630 technical guide: nominal chemical composition, mechanical and physical properties, corrosion resistance, welding, product forms and ASTM standards...
Udimet 630 (UNS N07630) is a nickel-chromium-cobalt superalloy (γ′). Highest-strength Udimet (high Ti γ′). Top creep/rupture in the family 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 630 for a project.
Udimet 630 belongs to the nickel-chromium-cobalt superalloy (γ′) class of materials. It is highest-strength udimet (high ti γ′). It is top creep/rupture in the family to 750 °c. It is demanding turbine disc & blade alloy.
Nominal (wt%) composition of Udimet 630 (UNS N07630):
| Element | Composition (wt%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 16.0 – 20.0 |
| Cobalt (Co) | 13.0 – 17.0 |
| Molybdenum (Mo) | 2.5 – 4.0 |
| Aluminium (Al) | 2.5 – 3.5 |
| Titanium (Ti) | 3.0 – 4.0 |
| Iron (Fe) | ≤ 3.0 |
| Carbon (C) | 0.04 – 0.09 |
| Boron (B) | ≤ 0.010 |
| Zirconium (Zr) | ≤ 0.05 |
Typical physical properties:
| Property | Value |
|---|---|
| Density | 8.10 g/cm³ |
| Melting Range | 1300 – 1360 °C |
| Thermal Expansion (20–1000 °C) | 13.8 µm/m·K |
| Thermal Conductivity (100 °C) | 11.5 W/m·K |
| Modulus of Elasticity | 209 GPa |
Typical room-temperature mechanical properties (annealed / specified condition unless noted):
| Property | Typical Value |
|---|---|
| Tensile Strength (Rm), aged | 1200 MPa (174 ksi) |
| Yield Strength, 0.2% (Rp0.2), aged | 880 MPa (128 ksi) |
| Elongation, aged | 13% |
| Hardness (Rockwell C), aged | 35 – 45 HRC |
| Property | Value |
|---|---|
| Creep rupture at 650 °C / 1000 h | ≈ 450 MPa |
| Service temperature | Up to 750 °C |
Udimet 630 is a high-titanium γ′-strengthened Ni-Cr-Co superalloy optimised for the highest creep and rupture strength in the Udimet family while retaining oxidation resistance. It is used for the most demanding turbine disc and blade applications.
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 5831 | 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 630 (UNS N07630) is a high-titanium γ′-strengthened Ni-Cr-Co superalloy optimised for the highest creep and rupture strength in the Udimet family while keeping oxidation resistance, for the most demanding turbine disc and blade roles to about 750 °C.
Aged: ≈ 1200 MPa tensile, ≈ 880 MPa yield, 13 % elongation, 35–45 HRC, with creep-rupture strength near 450 MPa at 650 °C / 1000 h.
630 pushes titanium higher for more γ′ and the highest strength/creep in the family, at some cost in ductility. 520 is the more balanced, slightly more ductile grade.
Yes, with matching/overalloyed fillers under a strict qualified procedure (solution treat + age), per turbine OEM specs.
High-performance gas-turbine discs and blades, aero-engine rotating parts, industrial turbine hot-section components and high-temperature bolting.
Bars/forgings referenced under AMS 5831, 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.