Nickel and nickel alloys · Alloy HAYNES 214 / UNS N07214 / 2.4646
Superalloy HAYNES 214 (UNS N07214): Engineering Reference for High-Temperature Applications
Engineering Specification of Superalloy HAYNES 214 / N07214 / 2.4646
The nickel-based superalloy HAYNES 214 (UNS N07214) is an advanced structural material designed for operation in extreme temperatures up to 1260°C. A key feature, as noted by EV Group China technologists, is its ability to form a self-healing, adhesive, and impermeable aluminum oxide (Al₂O₃) layer on its surface. This protective barrier provides exceptional resistance to oxidation and corrosion in the most aggressive environments, while maintaining mechanical strength and structural stability under cyclic thermomechanical loads.
| Type of rolled metal | International marking | European analogue |
|---|---|---|
| Round and flat wire, calibrated rods, shaped rolled products | HAYNES 214, UNS N07214, Cabot 214, Hastelloy 214 | W.Nr. |
| Round and flat wire, calibrated rods, shaped rolled products | HAYNES 214, UNS N07214, Cabot 214, Hastelloy 214 | 2.4646 |
Metallurgical analysis and operational characteristics of N07214
- Microstructural features: HAYNES 214 has an austenitic matrix (FCC), strengthened by alloying with aluminum and chromium. Aluminum is a key element for forming a protective oxide film, while chromium increases its stability and provides additional corrosion resistance.
- Operating temperatures and heat resistance: The alloy demonstrates excellent creep strength and fatigue durability at temperatures up to 1150°C, making it a preferred choice compared to traditional Ni-Cr alloys, whose performance is limited by lower temperature thresholds.
- Resistance to aggressive environments: In addition to oxidation resistance, the dense Al₂O₃ film provides effective protection against carburization, sulfidation, and corrosion in chlorine-containing atmospheres, which is critical for components of chemical reactors and furnace equipment.
Key application areas for alloy 2.4646
- Aerospace industry: Components of the "hot" section of gas turbine engines, including honeycomb seals, flame holders, transition ducts, and other elements exposed to direct combustion products.
- Industrial energy and heat treatment: High-temperature furnace equipment, recuperators, muffles, as well as components for gas turbines for stationary power plants, requiring long-term and reliable operation.
- Chemical processing: Parts for pyrolysis furnaces, catalytic grids, and equipment for processes occurring in aggressive environments at high temperatures, for example, in the production of vinyl chloride monomer (VCM).
- Automotive industry: Components of exhaust gas treatment systems, such as diesel particulate filters (DPF) and exhaust gas recirculation (EGR) systems, where resistance to hot corrosion and thermal cycling is required.
Specialists from the technological department of EV Group China confirm that alloy 214 is an optimal solution for critically important units where maximum service life and reliability are required under conditions of intense thermal and chemical exposure.
Standard chemical composition of HAYNES 214 (wt.%)
| Al | 4.1-5.0 | Mo | <0.50 |
|---|---|---|---|
| B | <0.004 | P | <0.015 |
| C | <0.05 | S | <0.015 |
| Nb/Cb | <0.15 | Si | <0.20 |
| Co | <2.0 | Ti | <0.50 |
| Cr | 15.0-17.0 | W | <0.50 |
| Fe | 2.0-4.0 | Y | 0.003-0.04 |
| Mg | <0.01 | Zr | <0.02 |
| Mn | <0.50 | Ni | Balance |
Typical mechanical properties of UNS N07214 alloy
| Supply condition | Annealed | Spring (cold worked) |
|---|---|---|
| Tensile strength (Rm), N/mm² | <1500 | 1300-1700 |
| Operating temperature range, °C | from -200 to +1100 | from -200 to +1100 |
Basic physical properties of HAYNES 214
The density of the material at room temperature is 8.05 g/cm³.
Main thermophysical parameters of alloy 2.4646
| Melting temperature (Solidus) | Linear thermal expansion coefficient (20–100 °C) | Shear modulus (rigidity) | Young's modulus (elasticity) |
|---|---|---|---|
| 1400 °C | 13.3 µm/m°C | 84 kN/mm² | 217 kN/mm² |