Haynes 230 (UNS N06230) is a premier nickel-chromium-tungsten-molybdenum solid-solution strengthened superalloy renowned for its exceptional combination of high-temperature strength, outstanding oxidation resistance, and excellent thermal stability. Engineered to perform reliably in the most extreme environments, it is a critical material across aerospace, energy, and industrial sectors.
Unmatched High-Temperature Capabilities
Haynes 230 excels where temperatures soar. Its key strength lies in its ability to maintain remarkable mechanical integrity at temperatures up to 1177°C (2150°F). This is primarily achieved through:
Solid-Solution Strengthening: High levels of tungsten (13-15%) and molybdenum (1-3%) dissolved in the nickel-chrome matrix provide exceptional resistance to deformation and creep under sustained load at elevated temperatures.
Superior Oxidation & Corrosion Resistance: A high chromium content (20-24%) enables the formation of a dense, adherent chromium oxide (Cr₂O₃) scale. This protective layer effectively shields the base metal from oxidation, carburization, and nitriding in harsh atmospheres, including those containing sulfur. The strategic addition of lanthanum (La) further enhances the scale’s adhesion and spallation resistance during thermal cycling.
Long-Term Thermal Stability: Haynes 230 exhibits minimal microstructural degradation over prolonged exposure to high heat, ensuring consistent performance and dimensional stability critical for components in gas turbines and industrial furnaces.
Key Properties and Advantages
High Strength: Delivers impressive tensile and yield strength from room temperature up to its maximum service temperature (e.g., ≥ 795 MPa UTS at room temperature).
Exceptional Creep Resistance: Withstands long-term stress at high temperatures without significant deformation.
Outstanding Oxidation Resistance: Proven performance in air up to approximately 1177°C (2150°F).
Good Fabricability: Exhibits better formability and weldability (using processes like GTAW/TIG with matching filler metals like ERNiCrWMo-1) compared to many precipitation-hardened superalloys, though strict process controls are essential.
Thermal Stability: Maintains ductility and toughness after extended high-temperature service.
Primary Applications
Haynes 230 is the material of choice for critical components operating under severe thermal stress:
Aerospace: Combustion chambers, transition ducts, flame holders, afterburner components, turbine seals, and hot-section structural parts in jet engines.
Power Generation: Combustion liners, transition pieces, burner nozzles, seals, and heat exchanger components in industrial gas turbines for power plants.
Industrial Heating: Radiant tubes, retorts (muffles), furnace rolls, heat treatment fixtures, fan blades, and burner components exposed to extreme heat and corrosive atmospheres.
Chemical Processing: Components for high-temperature reactors, reformers, and furnace internals where resistance to oxidation and specific corrosive environments is paramount.
