Waspaloy (GH4738)
Precipitation-hardening nickel-base superalloy with cobalt for turbine discs to about 800 C.
Material overview
Waspaloy (GH4738) is included in the High-Temperature Superalloys catalog. Precipitation-hardening nickel-base superalloy with cobalt for turbine discs to about 800 C. Key characteristics for evaluation include High tensile and creep strength, good oxidation and hot-corrosion resistance, and titanium and aluminium age hardening. Typical applications include Gas-turbine discs, blades and shafts and high-temperature fasteners. The dataset currently includes 16 property records covering chemical composition, mechanical properties, and physical properties. Associated standards include B637 and GB/T 14992, and product form records cover Forged Product and Bar / Rod. Final chemistry, mechanical properties, heat treatment, dimensions, inspection, and documentation must be confirmed against the applicable specification and mill certificate.
Key characteristics
- High tensile and creep strength
- good oxidation and hot-corrosion resistance
- titanium and aluminium age hardening
Typical applications
- Gas-turbine discs, blades and shafts
- high-temperature fasteners
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 | 18.0-21.0 | wt% | Typical value |
| Co | 12.0-15.0 | wt% | Typical value |
| Mo | 3.5-5.0 | wt% | Typical value |
| Ti | 2.75-3.25 | wt% | Typical value |
| Al | 1.2-1.6 | wt% | Typical value |
| Fe | 2.0 max | wt% | Typical value |
| C | 0.03-0.1 | wt% | Typical value |
| Mn | 0.1 max | wt% | Typical value |
| Si | 0.15 max | wt% | Typical value |
| B | 0.006 max | wt% | Typical value |
| Zr | 0.08 max | wt% | Typical value |
Mechanical properties
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Tensile strength | min 1240 | MPa | Solution + aged |
| Yield strength 0.2% | min 793 | MPa | Solution + aged |
| Elongation | min 12 | % | Solution + aged |
Physical properties
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Density | 8.19 | g/cm3 | Typical |
Standards and specifications
Forms, applications, and capabilities
Product forms
- Product form
- Bar / Rod
Industries
- Industry
Capabilities
- Vacuum Induction Melting
- Capability
- Capability
- Capability
- Heat Treatment
- Capability
- Nondestructive & Laboratory Testing