Introduction:
GH3128 (GH128) is a nickel-based alloy solid solution reinforced with tungsten and molybdenum and grain boundaries reinforced with boron, cerium and zirconium. It has high plasticity, high lasting creep strength, good oxidation resistance and stamping, welding and other properties. . Its comprehensive performance is better than similar nickel-based solid solution alloys such as GH3044 and GH3536. It is suitable for manufacturing combustion chamber flame tubes, afterburner casings, regulator plates and other high-temperature parts of aeroengines that operate at 950°C for a long time. The main products are cold-rolled sheets, and hot-rolled plates, bars, etc. can also be supplied. Forgings, wire and tubing.
Parameter:
| Chemical Composition ( % ) |
| Brand | C | Si | Mn | S | P | Cr | Co | W | Mo | Ti | Al | Fe | Ni | other |
| Less than |
| GH3128 | 0.05 | 0.8 | 0.5 | 0.013 | 0.013 | 19~22 | — | 7.5~9 | 7.5～9 | 0.4～0.8 | 0.4～0.8 | ≤2.0 | rest | B≤0.005
Ce≤0.05
Zr≤0.06 |
| The minimum mechanical properties of the alloy at room temperature |
| Brand | heat treatment | tensile strength
RmN/mm² | Yield strength
Rp0.2N/mm2 | Elongation
As% | Brinell hardness
HB | Rockwell hardness
HRC |
| GH3128 | solid solution | 750 | | 40 | — | |
| θ/℃ | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 | 950 |
| λ/(W/(m·C)) | 11.30 | 12.56 | 14.24 | 15.49 | 16.75 | 18.42 | 19.68 | 21.35 | 23.02 | 23.86 |
- Linear expansion coefficient
| θ/℃ | 18～100 | 18～200 | 18～300 | 18～400 | 18～500 | 18～600 | 18～700 | 18～800 | 18～900 | 18～1000 |
| α/10-6C-1 | 11.25 | 11.86 | 12.68 | 12.80 | 13.37 | 13.68 | 14.46 | 15.19 | 15.66 | 15.29 |
Characteristic:
- High temperature strength: GH3128 wire has excellent high temperature strength and can maintain high mechanical properties in high temperature environments.
- Antioxidant properties: It exhibits good antioxidant properties and can resist oxidation and corrosion at high temperatures.
- Creep resistance: GH3128 wire has good creep resistance and can withstand long-term continuous loading at high temperatures without deformation.
- Anti-corrosion properties: It has good anti-corrosion properties in many corrosive media, including acidic, alkaline and chloride environments.
Specific application areas:
- Aeroengine combustion chamber flame tube, afterburner housing, regulator plate
- Structural parts of gas turbine combustion chamber
- Turbine engine combustion chamber parts
- Afterburner parts
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Process performance and requirements:
The alloy has a single-phase austenite structure in the solid solution state and contains a small amount of fine and evenly distributed TiN and M6C.
1. The furnace temperature for steel ingot forging should not be higher than 700°C, and the final forging temperature should be higher than 900°C.
2. The average grain size of the alloy is closely related to the deformation degree and final forging temperature of the forging.
3. Alloys can be welded by argon arc welding, spot welding, seam welding and other methods.
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