High-performance alloy material for industrial engineering and critical application conditions.
1. Introduction to GH2747 Material
GH2747 (old grade GH747) is a precipitation-hardening wrought Fe-Ni-Cr superalloy capable of ultra-high service temperature. In solid solution state, it can serve long-term at 1100-1250℃ with short-term maximum service temperature up to 1300℃. It features outstanding weldability, high strength, stable microstructure, and superior oxidation & corrosion resistance under high temperature environments.
2. GH2747 implementation standards
GB/T14992-2005 Classification and Brand of High-Temperature Alloys and Intermetallic Compounds High-Temperature Materials
Q/GYB511 GH2747 Alloy Hot Rolled and Forged Rods
Q/GYB511 GH2747 Alloy Cold Drawn (Rolled) Seamless Pipes
GB/T15062 General Use High-Temperature Alloys
GJB1952A Specification for Cold Rolled Thin Plates for High-Temperature Alloys
GJB2297A Specification for Cold Drawn (Rolled) Seamless Pipes for High-Temperature Alloys
GJB2612 Specification for Cold Drawn Welding Wires of High-Temperature Alloys for Aviation
GJB3165A Specification for Hot Rolled and Forged Rods for Aviation High-Temperature Alloys
GJB3317A Specification for Hot Rolled Plates of Aviation High Temperature Alloys
GJB3318A Specifications for Hot Rolled Strips for Aviation High Temperature Alloys
HB/Z140 Heat Treatment Process for Aviation High Temperature Alloys
3. Chemical composition of GH2747
| Alloy | Limit | Fe | Cr | Ni | Al | Ce | C | Mn | Si | S | P |
| GH2747 | Minimum | Bal | 15.00 | 44.0 | 2.90 | – | – | – | – | – | – |
| Maximum | 27.00 | 46.0 | 3.90 | 0.030 | 0.10 | 1.00 | 1.00 | 0.020 | 0.025 |
4. Physical properties
| Density(g/cm³) | Thermal conductivity W/(m·K) (100~900℃) | Linear expansion coefficient/(10⁻⁶/K) (20~800℃) |
| 7.78 | 10.5-24.3 | 17.07 |
| Temperature/℃ | 20 | 500 | 600 | 700 | 800 |
| Elastic modulus E/GPa | 218 | 177 | 159 | 146 | 128 |
| Product form | Heat treatment state | Test temperature/℃ | Tensile strength σb/MPa ≥ | Elongation A/% ≥ | Reduction of area Z/% ≥ |
| Hot rolled bar | Standard heat treatment | 20 | 550 | 15 | 20 |
| 1000 | 40 | 30 | 30 | ||
| Cold rolled thin sheet | Standard heat treatment | 20 | 600 | 30 |
5. Welding performance
The alloy has excellent comprehensive welding workability and adapts to all common welding processes. TIG welding, spot welding, seam welding and electron beam welding achieve superior welding quality. For dissimilar metal welding, matching base alloy wire or identical GH2747 filler wire can be used as filling material.
6. Application fields
GH2747 is widely used for high-temperature oxidation-resistant structural parts in nuclear energy, petrochemical, metallurgy and other industries.
It is applicable to oxidation-resistant components of engine combustion chambers and afterburners, as well as industrial heat-resistant parts including furnace rollers, boiler components, transmission parts and thermocouple sleeves.
