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 GH3128 Materials
GH3128 (GH128) is a nickel-based superalloy solid-solution strengthened by tungsten and molybdenum, with grain boundary strengthening from boron, cerium and zirconium. It features high plasticity, excellent rupture and creep strength, outstanding oxidation resistance, superior stamping and weldability. Its overall performance surpasses comparable nickel-based solid-solution alloys including GH3044 and GH3536. It is designed for long-term service aero-engine high-temperature components operating at 950℃ such as combustion chamber flame tubes, afterburner casings and adjusting sheets. Primary supply product: cold rolled thin sheets; also available hot rolled plates, bars, forgings, wires and tubes.
2. GH3128 implementation standards
GB/T14992-2005 Classification and Grade of High Temperature Alloys and Intermetallic Compounds
GB/T14995-2005 Hot rolled superalloy plates
GB/T14996-2005 Cold rolled thin superalloy sheets
GJB1952A Specifications for Cold Rolled Thin Plates for Aviation High Temperature Alloys
GJB2612 Specifications for Cold Drawn Welding Wires of High Temperature Alloys for Aviation
GJB3317A Specifications for Hot Rolled Plates of Aviation High Temperature Alloys
3. Chemical composition of GH3128
| Alloy | Limit | Ni | Cr | Fe | Mo | W | C | Mn | Si | S | P | Al | Ti |
| GH3128 | Minimum | Bal | 19.00 | – | 7.5 | 7.5 | – | – | – | – | – | 0.40 | 0.40 |
| Maximum | 22.00 | 0.20 | 9.0 | 9.0 | 0.05 | 0.50 | 0.80 | 0.013 | 0.013 | 0.80 | 0.80 |
4. GH3128 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) | Linear expansion coefficient/(10⁻⁶/℃) |
| 8.81 | 1340-1390 | 11.3(100℃) | — | 208 | — | 1.37 | 11.25(20~100℃) |
Room temperature mechanical properties in solid solution state:
| Alloy state | Tensile strength σb (MPa) | Elongation A5 % |
| Solid solution state | ≥735 | ≥40 |
5. GH3128 material characteristics
This nickel alloy adopts W-Mo solid solution strengthening with grain boundary strengthening by B, Ce and Zr. It delivers high plasticity, superior rupture and creep strength, good oxidation resistance, stamping performance and weldability, outperforming similar Ni-based solid-solution alloys like GH3044 and GH3536.
The alloy presents single-phase austenite after solid solution treatment, containing a small quantity of finely and uniformly distributed TiN and M6C precipitates.
6. GH3128 processing performance & technical requirements
1. Heating temperature for ingot forging shall not exceed 700℃, finish forging temperature above 900℃.
2. Average grain size is closely related to forging deformation amount and finish forging temperature.
3. GH3128 can be welded via TIG welding, spot welding, seam welding and other processes.
7. GH3128 application fields
1. Aero-engine combustion chamber flame tubes
2. Gas turbine combustion chamber structural components
3. Turbine engine combustion chamber parts
4. Afterburner components, afterburner casings, adjusting plates
