Обзор
GH2747 (also designated GH747 / GH2747) is a Chinese-standard deformation (wrought) precipitation-hardenable nickel-iron-chromium superalloy with nominal 37% Ni, 25% Cr, ~37% Fe, strengthened primarily by γ′ (Ni₃Al) intermetallic precipitation via additions of aluminum (3.5%) and titanium (1.0%), with solid-solution strengthening from tungsten (5.0%) and niobium (1.5%). It is designed for long-term service at 600–1,100°C and short-term exposure up to 1,200°C, exhibiting excellent high-temperature strength, microstructure stability, oxidation resistance, and resistance to hot corrosion (sulfidation). GH2747 round bar is supplied in solution-treated or solution-treated + aged condition, depending on customer requirement, for machining of critical hot-section rotating and static components in aerospace, power generation, petrochemical, and industrial furnace equipment.
Диапазон Размеров
- OD14 – 250mm
Спецификация Марки
| Система | Значение |
|---|---|
| 🇨🇳 GB | GH2747 / GH747 |
| 🇺🇸 UNS | No exact equivalent; closest related UNS N06230 (Haynes 230) |
| 🇺🇸 UNS | No direct ASTM grade; see Haynes 230, Rene 41, Waspaloy for comparison (all different) |
| UNS N06230 (alternative) | Haynes 230 — similar Cr/W base but different Ni/C/Al/Ti balance |
| 🇩🇪 DIN | No direct equivalent; compare with NiCr23FeMoW/Nicrofer 5520 Co (alloy 617 mod) |
| 🇷🇺 GOST | ХН70МБЮ (KhN70MBYu, EI602 related family — different) |
| 🇯🇵 JIS | No direct JIS equivalent; compare with NCF 601 / 800H for applications |
Химический Состав
| Элемент | Значение |
|---|---|
| C | 0.05-0.12 |
| Cr | 23-26 |
| Ni | 35-40 |
| W | 4.5-6 |
| Niobium + Tantalum (Nb+Ta) | 1-2 |
| Al | 3-4 |
| Ti | 0.5-1.3 |
| La | 0.005-0.05 |
| Mn | 0.5 |
| Si | 0.6 |
| P | 0.015 |
| S | 0.010 |
| Cu | 0.20 |
| B | 0.015 |
| Ce | 0.050 |
| Zr | 0.10 |
| Fe | Remainder |
| Al + Ti | 4.8 |
Механические Свойства
| productCenter.property | Значение |
|---|---|
| Tensile Strength, Rm (MPa) | 700 |
| Yield Strength, Rp₀.₂ (MPa) | 350 |
| Elongation, A₅ (%) | 35 |
| Reduction of Area, Z (%) | 40 |
Физические Свойства
| Свойство | Единица | Значение |
|---|---|---|
| Density (g/cm³) | g/cm³ | 8.28 |
| Melting Range (°C) | °C | 1,330 – 1,370 |
Применение
- Aerospace & Aviation
- Industrial Gas Turbines
- Petrochemical & Refining
- Nuclear & Fossil Power
- Industrial Furnaces, Heat Treating & Metallurgy
- Marine & Offshore
- Specialty Equipment