High-Temperature Alloys / Superalloys
GH4099 (ЭП693) (UNS —) — Composition, Properties & Supply
GH4099 is a Ni-Cr-Co-W-Mo precipitation-hardened nickel superalloy for long-term service at 900 °C and short-term at 1000 °C. Combining high-temperature strength with excellent oxidation resistance and weldability, it is the material of choice for aero-engine combustor and afterburner welded load-bearing sheet structures.
What is the chemical composition of GH4099 (ЭП693)?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | Balance |
| Cr | Cr | 17.0–20.0 |
| Co | Co | 5.0–8.0 |
| W | W | 5.0–7.0 |
| Mo | Mo | 3.5–4.5 |
| Al | Al | 1.7–2.4 |
| Ti | Ti | 1.0–1.5 |
| Fe | Fe | ≤ 2.0 |
| C | C | ≤ 0.08 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of GH4099 (ЭП693)?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 1100 MPa | Room temperature |
| Yield strength (0.2% offset) | ≥ 700 MPa | Room temperature |
| Elongation | ≥ 12 % | Gauge length 50 mm / 4D |
| Hardness | 280–320 HBW | Brinell / Rockwell |
What are the physical properties of GH4099 (ЭП693)?
| Property | Value |
|---|---|
| Density | 8.30 g/cm³ |
| Melting range | 1330–1390 °C |
| Thermal conductivity | 21.8 W/m·K |
| Elastic modulus | 208 GPa |
| Maximum service temperature | 900 °C |
What are the key characteristics of GH4099 (ЭП693)?
- Oxidation resistant for long service at 900 °C
- Large sheet structures usable directly after solution treatment without ageing
- γ′ precipitation strengthening
- Outstanding weldability
Where is GH4099 (ЭП693) used?
- Aero-engine combustors and afterburners
- High-temperature welded load-bearing sheet structures
- Gas turbine hot components
- Aero-engine heat-affected structures
Which standards and specifications cover GH4099 (ЭП693)?
- GB/T 14992
- GB/T 14995
- GJB 1952A
What product forms are available?
Frequently asked questions
What is the heat treatment for GH4099?
Solution treatment at 1080–1140 °C (1140–1160 °C for sheet) followed by air cooling; to raise strength between 600–900 °C, age at 900 °C ±10 °C for 4 h and air cool. Large welded sheet assemblies can be used directly after solution treatment.
Need GH4099 (ЭП693) bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
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