About Alloy
Haynes 556 alloy (UNS R30556) is a nickel-chromium-iron-cobalt superalloy developed by Haynes International. It is known for its exceptional high-temperature strength, excellent resistance to oxidation and corrosion, and good fabricability.
The chemical composition of Haynes 556 typically includes around 21-23% chromium, 18-20% cobalt, 17-19% iron, 14-16% nickel, and small amounts of other elements like molybdenum, tungsten, manganese, and silicon. This unique blend of alloying elements gives the material its distinctive properties.
One of the key features of Haynes 556 is its exceptional high-temperature strength. The alloy maintains its tensile and yield strengths even at temperatures up to 1800°F (982°C), making it suitable for use in demanding high-temperature applications. Additionally, Haynes 556 exhibits excellent creep resistance, allowing it to withstand prolonged exposure to high stresses and temperatures without significant deformation.
Another important characteristic of this superalloy is its superior resistance to oxidation and corrosion. The protective oxide layer that forms on the surface of Haynes 556 helps it withstand harsh, high-temperature environments, such as those encountered in gas turbine engines, industrial furnaces, and chemical processing equipment. This resistance to oxidation and corrosion is a key factor in its widespread use in various industries.
Haynes 556 also demonstrates good fabricability, allowing it to be easily formed, welded, and machined. This property is valuable in applications where intricate designs and precise specifications are required.
Due to its combination of high-temperature strength, oxidation and corrosion resistance, and fabricability, Haynes 556 finds applications in the aerospace, power generation, and chemical processing industries. In the aerospace sector, it is used in components like turbine blades, vanes, and combustion chambers. In power generation, the alloy is employed in steam turbine parts and boiler equipment. It also sees use in the petrochemical industry, particularly in reactors, heat exchangers, and other process equipment operating at elevated temperatures.
The exceptional performance of Haynes 556 under extreme conditions, coupled with its versatility, has made it a valuable material in industries where reliability and durability are of utmost importance.
Product Form
Wire Rod: AMS 5831
Sheet/Plate/Strip: AMS 5874
Bar, Forgings, Flash Welded Rngs: AMS 5877
Chemical Composition
| Elements | Content (%) |
| Iron, Fe | 31 |
| Chromium, Cr | 22 |
| Nickel, Ni | 20 |
| Cobalt, Co | 18 |
| Molybdenum, Mo | 3 |
| Tungsten, W | 2.5 |
| Manganese, Mn | 1 |
| Tantalum, Ta | 0.6 |
| Silicon, Si | 0.4 |
| Nitrogen, N | 0.2 |
| Aluminum, Al | 0.2 |
| Carbon, C | 0.1 |
| Lanthanum, La | 0.02 |
| Zirconium, Zr | 0.02 |
Property
| Properties | Metric | Imperial |
| Tensile strength | 815 MPa | 118000 psi |
| Yield strength | 410 MPa | 59500 psi |
| Charpy impact | 240 J | 177 ft.lb |
| Elongation at break | 47.70% | 47.70% |
| Elastic modulus | 205 GPa | 29700 ksi |
Application
Incinerators
Gas turbines
Heat transfer systems
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