High-performance alloy material for industrial engineering and critical application conditions.
Scope of supply for Aviation Group
Forgings, round rods, steel plates, rings, seamless pipes, steel plates/steel belts, wire welding materials, welcome to inquire!
1. Introduction to GH625/GH3625 materials
GH3625 (GH625) is a solid-solution strengthened wrought nickel-based superalloy with molybdenum and niobium as primary strengthening elements. It features outstanding corrosion resistance and oxidation resistance, stable tensile and fatigue performance from cryogenic temperature up to 980℃, and strong resistance to stress corrosion under salt spray environments.
GJB 1953-1994 Specifications on Hot Rolled Rods for High Temperature Alloys for Rotating Parts of Aero Engines
GJB 2611-1996 Specifications for Cold Drawn Rods for Aviation High Temperature Alloys
GJB 2612-1996 Specifications for Cold Drawn Welding Wires of High Temperature Alloys for Aviation
GJB 3020-1997 Specifications for Aviation High Temperature Alloy Ring Blanks
GJB 3165-1998 Specifications on Hot Rolled & Forged Rods for Aviation Load-Bearing Components
GJB 3782-1999 Specifications for Aviation High Temperature Alloy Rods
HB 5198-1982 Wrought High-Temperature Alloy Rods for Aviation Blades
2. Chemical components
| Alloy | Limit | C | Cr | Co | Ni | Mo | Nb | Fe | Al | Ti | Si | Mn | S | P | Cu |
| GH625/GH3625 | Minimum | – | 20.0 | – | Bal | 8.0 | 3.15 | – | – | – | – | – | – | – | – |
| Maximum | 0.10 | 23.0 | 1.0 | 10.0 | 4.15 | 5.0 | 0.4 | 0.4 | 0.5 | 0.5 | 0.015 | 0.015 | 0.07 |
3. Physical properties
| Density(g/cm³) | Melting point(℃) | Thermal conductivity λ/(W/m·℃) | Specific heat capacity(J/kg·℃) | Elastic modulus(GPa) | Shear modulus(GPa) | Resistivity(μΩ·m) | Poisson’s ratio | Linear expansion coefficient(10⁻⁶/℃) |
| 8.44 | 1290-1350 | 12.1(100℃) | 430 | 205 | 79 | 1.28 | 0.308 | 12.3(20~100℃) |
4. Mechanical properties
Minimum mechanical properties tested at 20℃ [1]
| Heat treatment method | Tensile strength σb/MPa | Yield strength σp0.2/MPa | Elongation A5/% | Brinell hardness HBS |
| Solid solution treatment | 830 | 410 | 30 | ≤290 |
5. Alloy characteristics
Excellent corrosion resistance to various corrosive media under both oxidizing and reducing conditions
Superior resistance to pitting and crevice corrosion, free from chloride-induced stress corrosion cracking
Outstanding resistance to inorganic acid corrosion including nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid and mixed sulfuric-hydrochloric acid
Great tolerance to various mixed inorganic acid solutions
Maintains reliable corrosion resistance in hydrochloric acid of all concentrations up to 40℃
Good formability and weldability, no post-weld cracking susceptibility
Qualified for pressure vessel manufacturing with wall temperature range from -196℃ to 450℃
6. Application areas
Components for chloride-containing organic chemical processes, especially equipment using acid chloride catalysts
Cooking vessels and bleaching tanks in pulp & paper industry
Absorption towers, reheaters, flue gas baffles, wet fans, agitators, deflectors and flue ducts for flue gas desulfurization systems
Equipment and structural parts operating in acid gas environments
Reaction equipment for acetic acid and acetic anhydride production
