GH3128
Tungsten and molybdenum strengthened nickel-base sheet superalloy for service up to about 950 C.
Material overview
The High-Temperature Superalloys catalog describes GH3128 as follows: Tungsten and molybdenum strengthened nickel-base sheet superalloy for service up to about 950 C. Reviewers should evaluate High W and Mo for solid-solution strengthening, good oxidation and stamping performance, and long-term use at 950 C. The grade record lists flame tubes and high-temperature sheet components among typical applications. The dataset currently includes 13 property records covering chemical composition, mechanical properties, and physical properties. Standards and form records reference GB/T 14992 and GB/T 15007 and Sheet / Coil and Plate. Final supply conditions remain subject to specification, inspection, and export-control review.
Key characteristics
- High W and Mo for solid-solution strengthening
- good oxidation and stamping performance
- long-term use at 950 C
Typical applications
- flame tubes
- high-temperature sheet components
Grade names and equivalents
Technical properties
Typical values are for reference only. Final chemistry, mechanical properties, heat treatment, dimensions, inspection, and documentation are confirmed against the applicable specification and MTC/COA before order acceptance.
Chemical composition
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Ni | balance | wt% | Typical value |
| Cr | 19.0-22.0 | wt% | Typical value |
| W | 7.5-9.0 | wt% | Typical value |
| Mo | 7.5-9.0 | wt% | Typical value |
| Fe | 2.0 max | wt% | Typical value |
| C | 0.1 max | wt% | Typical value |
| Al | 0.4-0.8 | wt% | Typical value |
| Ti | 0.4-0.8 | wt% | Typical value |
| Mn | 0.5 max | wt% | Typical value |
| Si | 0.8 max | wt% | Typical value |
Mechanical properties
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Tensile strength | min 785 | MPa | Solution annealed |
| Elongation | min 40 | % | Solution annealed |
Physical properties
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Density | 9.81 | g/cm3 | Typical |