Haynes Alloys Bar Haynes 214

Overview

Haynes 214 is a nickel-chromium-aluminum-iron alloy with additions of yttrium, optimized for extreme high-temperature stability.

Limiting Chemical Composition, %

Nickel...........................................................................................................................................75.0-80.0

Chromium............................................................................................................................................16.0

Aluminum..............................................................................................................................................4.5

Iron.........................................................................................................................................................3.0

Yttrium (Y): Trace amounts (enhances oxide layer adhesion and spallation resistance).

Main Properties

Key Properties

● Ultra-High Temperature Resistance:

Retains strength and oxidation resistance up to 1200°C (2200°F).

Stable Al₂O₃ scale resists spalling due to yttrium’s “anchor” effect.

● Mechanical Performance:

Excellent creep resistance under prolonged stress at high temperatures.

Good thermal fatigue resistance for cyclic heating/cooling applications.

● Corrosion Resistance:

Performs well in oxidizing, carburizing, and nitriding atmospheres (e.g., industrial furnaces).

Fabrication and Processing

● Forming:

Bars are typically produced via hot working (forging, rolling) and supplied in annealed condition (AMS 5877).

● Machining:

Challenging due to high work-hardening rates; use rigid setups, sharp carbide tools, and low-speed/high-feed techniques.

Coolants are recommended to manage heat generation.

● Heat Treatment:

Solution annealing at 1120–1175°C (2050–2150°F) followed by rapid cooling to optimize microstructure.

● Welding:

Compatible with TIG (GTAW) and resistance welding. Post-weld annealing reduces residual stresses.

Applications:

● Aerospace:

Turbine engine components (combustors, seals), structural parts in high-heat zones.

● Industrial:

Furnace fixtures (racks, rails, radiant tubes).

Heat exchangers, burner nozzles, and pyrolysis equipment.

● Energy:

Components in gas turbines and nuclear reactors.

Comparisons:

● vs. Inconel 601/625: Superior oxidation resistance above 1000°C due to Al/Y-enhanced oxide layer.

● vs. Haynes 230: Better resistance to carburization but lower intermediate-temperature strength.

● vs. Nickel 201: Far higher temperature capability but less ductility at room temperature.

Standards and Specifications

● AMS 5877: Aerospace Material Specification for Haynes 214 bar stock.

● ASTM B408: Standard for nickel-alloy bars and forgings (general guidance).

Key Considerations

● Cost: High due to nickel and yttrium content; justified in mission-critical applications.

● Thermal Stability: Avoid prolonged exposure to 650–870°C (1200–1600°F), where sigma phase formation could embrittle the alloy.

● Surface Finish: Grinding or pickling may be required post-machining to remove surface oxides.

Conclusion:

Haynes 214 alloy bar is engineered for extreme environments demanding unmatched oxidation resistance, thermal stability, and mechanical integrity. Its niche lies in aerospace and industrial systems operating at ultra-high temperatures, where most alloys degrade rapidly. While challenging to machine, its performance in harsh conditions makes it a premium choice for critical high-heat applications.

Available Forms

We provide you with a variety of product forms, including but not limited to

● Strip & Foil

● Round Wire &Flat Wire

● Bar & Rod

● Electrothermal Strip

● Flange & Ring

● Wire & Welding

● Reststance Wire

● Electric Alloy Wire

● Electric Furnace Bar

● Customize