High-Temperature Alloys / Superalloys
GH4648 (ЭП648) (UNS —) — Composition, Properties & Supply
GH4648 is a very-high-chromium (about 32%) nickel-base precipitation-hardening superalloy for long-term service at 900 °C and short-term to 1100 °C, offering outstanding oxidation and hot-corrosion resistance with moderate strength and good fatigue/creep behaviour, for high-temperature structural parts in corrosive service.
What is the chemical composition of GH4648 (ЭП648)?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | Balance |
| Cr | Cr | 32.0–35.0 |
| W | W | 4.5–5.5 |
| Mo | Mo | 2.5–3.5 |
| Al | Al | 0.5–1.1 |
| Ti | Ti | 0.5–1.1 |
| Nb | Nb | 0.5–1.1 |
| Fe | Fe | ≤ 4.0 |
| C | C | ≤ 0.10 |
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 GH4648 (ЭП648)?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 780 MPa | Room temperature |
| Yield strength (0.2% offset) | ≥ 345 MPa | Room temperature |
| Elongation | ≥ 25 % | Gauge length 50 mm / 4D |
| Hardness | 220–280 HBW | Brinell / Rockwell |
What are the physical properties of GH4648 (ЭП648)?
| Property | Value |
|---|---|
| Density | 8.27 g/cm³ |
| Melting range | 1336–1395 °C |
| Thermal conductivity | 11.2 W/m·K |
| Elastic modulus | 205 GPa |
| Maximum service temperature | 900 °C |
What are the key characteristics of GH4648 (ЭП648)?
- About 32% Cr for hot-corrosion resistance
- Service between 900–1100 °C
- Moderate strength with good fatigue and creep
- Good cold/hot working and welding
Where is GH4648 (ЭП648) used?
- Aero-engine combustor casings and flame tubes
- Turbine guide vanes and exhaust nozzle flaps
- Ethylene cracking furnace tubes
- Gas turbine combustor liners
Which standards and specifications cover GH4648 (ЭП648)?
What product forms are available?
Frequently asked questions
Are there any usage cautions for GH4648?
Avoid long-term service in the 550–650 °C sensitisation range where grain-boundary carbide coarsening may reduce impact toughness; in sulphur-bearing gas above 800 °C keep sulphur below 0.1% to prevent hot sulphidation.
Need GH4648 (ЭП648) 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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