High-Temperature Alloys / Superalloys
GH2747 (Haynes 747) (UNS —) — Composition, Properties & Supply
GH2747 is a Fe-Ni-Cr precipitation-hardening superalloy (equivalent to US Haynes 747 and Russian ЭП747). High chromium, high aluminium and rare-earth cerium give outstanding oxidation resistance at 1100–1250 °C (short-term to 1300 °C) at lower cost than nickel-base grades, for furnace rollers, thermocouple sheaths and heat-treatment equipment parts.
What is the chemical composition of GH2747 (Haynes 747)?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Fe | Fe | Balance |
| Ni | Ni | 44.0–46.0 |
| Cr | Cr | 15.0–17.0 |
| Al | Al | 2.9–3.9 |
| Ce | Ce | ≤ 0.03 |
| C | C | ≤ 0.10 |
| Si | Si | ≤ 1.0 |
| Mn | Mn | ≤ 1.0 |
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 GH2747 (Haynes 747)?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 735 MPa | Room temperature |
| Yield strength (0.2% offset) | ≥ 400 MPa | Room temperature |
| Elongation | ≥ 18 % | Gauge length 50 mm / 4D |
| Hardness | ≤ 250 HB | Brinell / Rockwell |
What are the physical properties of GH2747 (Haynes 747)?
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting range | 1300–1410 °C |
| Thermal conductivity | 14.0 W/m·K |
| Elastic modulus | 205 GPa |
| Maximum service temperature | 1100–1250 °C |
What are the key characteristics of GH2747 (Haynes 747)?
- Ultra-high-temperature oxidation resistance to 1100–1250 °C
- Cr/Al layered oxide scale with Ce additives resists spalling on thermal cycling
- Lower alloy cost than nickel-base grades
- Good weldability
Where is GH2747 (Haynes 747) used?
- Furnace rollers, radiant tubes and trays
- Thermocouple sheaths and heat-resistant parts
- Ethylene cracking furnace internals
- Glass and ceramic kiln components
Which standards and specifications cover GH2747 (Haynes 747)?
What product forms are available?
Frequently asked questions
What service temperature does GH2747 reach?
GH2747 serves long-term to 1100–1250 °C and short-term to 1300 °C. It is supplied in the solution-treated condition; to raise mid-temperature strength of 700–900 °C, age at 750–800 °C for 16 h and air cool.
Need GH2747 (Haynes 747) 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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