HAYNES 230 Severe Corrosion and Heat Resistant Alloy,UNS N06230，1

### **Product Introduction: HAYNES® 230® (UNS N06230) Severe Corrosion and Heat Resistant Alloy** **Overview** HAYNES 230 alloy is a premier nickel-chromium-tungsten-molybdenum alloy renowned for its exceptional combination of high-temperature strength, outstanding resistance to oxidation, and excellent long-term thermal stability. It possesses a unique balance of properties, including high creep-rupture strength, good fatigue resistance, and superior resistance to a wide range of corrosive environments. This versatile alloy is a preferred material for the most demanding applications in aerospace, industrial heating, and power generation, where reliability at extreme temperatures is paramount. --- #### **Chemical Composition (Typical % by Weight)** The sophisticated composition of HAYNES 230 is the foundation of its superior performance. | Element | Content (%) | Role & Benefit | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the stable austenitic matrix, providing the foundation for high-temperature strength and metallurgical stability. | | **Chromium (Cr)** | 20.0 - 24.0 | Imparts exceptional resistance to oxidation and sulfidation by forming a protective, adherent chromium oxide (Cr₂O₃) scale. | | **Tungsten (W)** | 13.0 - 15.0 | A primary solid-solution strengthener, significantly enhancing high-temperature creep strength and stability. | | **Molybdenum (Mo)** | 1.0 - 3.0 | Works synergistically with tungsten to provide solid-solution strengthening and improve resistance to reducing environments. | | **Cobalt (Co)** | 5.0 max | A residual element controlled to ensure consistent properties. | | **Iron (Fe)** | 3.0 max | Kept at a low level to optimize high-temperature corrosion resistance. | | **Manganese (Mn)**| 0.30 - 1.00 | Aids in manufacturability and controls sulfur. | | **Silicon (Si)** | 0.25 - 0.75 | Enhances resistance to oxidation and carburization by promoting the formation of a stable, protective scale. | | **Aluminum (Al)** | 0.20 - 0.50 | Contributes to oxidation resistance through the formation of a tenacious alumina layer within the scale. | | **Carbon (C)** | 0.05 - 0.15 | Controlled content provides strengthening through carbide formation, primarily at grain boundaries, enhancing creep strength. | | **Lanthanum (La)** | 0.005 - 0.050 | A critical addition that dramatically improves the spallation resistance of the protective oxide scale under severe thermal cycling conditions. | | **Boron (B)** | 0.015 max | Added to improve creep ductility and strength. | *Note: "HAYNES" and "230" are registered trademarks of Haynes International Inc.* --- #### **Physical & Mechanical Properties (Typical)** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.97 g/cm³ (0.324 lb/in³) | | **Melting Range** | 1300 - 1370 °C (2370 - 2500 °F) | | **Specific Heat** | 440 J/kg·K (0.105 BTU/lb·°F) @ 20°C | | **Thermal Conductivity**| 11.6 W/m·K (80.3 BTU·in/hr·ft²·°F) @ 100°C | | **Thermal Expansion** | 12.4 μm/m·°C (6.9 μin/in·°F) @ 20-100°C | | **Tensile Strength (Room Temp)** | 795 MPa (115 ksi) min | | **Yield Strength (0.2% Offset, Room Temp)** | 345 MPa (50 ksi) min | | **Elongation (Room Temp)** | 40% min | --- #### **International Standards and Specifications** HAYNES 230 alloy is covered by several key international standards for wrought products. * **ASTM B435:** Standard Specification for UNS N06230 Plate, Sheet, and Strip. * **ASTM B366:** Standard Specification for Factory-Made Wrought Nickel and Nickel Alloy Fittings. * **ASTM B564:** Standard Specification for Nickel Alloy Forgings. * **ASME SB-435 / SB-564:** Approved for use in ASME Boiler and Pressure Vessel Code applications. * **AMS 5878:** Aerospace Material Specification for sheet, strip, and plate. * **UNS N06230:** Unified Numbering System designation. * **DIN 2.4733:** The corresponding material number in the German standard. --- #### **Product Applications** HAYNES 230 is a workhorse alloy in the most demanding high-temperature applications across multiple industries. 1. **Aerospace & Gas Turbines:** * Combustion liners, transition ducts, and spray bars. * Turbine shrouds, rings, and afterburner components. * High-temperature seals and fasteners. 2. **Industrial Furnaces & Heat Treating:** * Radiant tubes, muffles, and retorts for high-temperature furnaces. * Heat treatment fixtures, baskets, and trays. * Components in carburizing and neutral atmospheres. 3. **Power Generation:** * Advanced liner systems and transition pieces in industrial gas turbines. * Tube supports and hangers in ultra-supercritical coal-fired boilers. * Components in heat recovery steam generators (HRSGs). 4. **Chemical Process Industry:** * Equipment for high-temperature catalytic processes. * Heat exchangers and reformers in syngas production. #### **Key Advantages** * **Exceptional High-Temperature Strength:** Offers an outstanding combination of high tensile, creep, and rupture strength up to 1200°C (2200°F). * **Superior Oxidation Resistance:** Excellent resistance to scaling and spallation up to 1150°C (2100°F), outperforming many competing alloys due to its lanthanum addition. * **Excellent Thermal Stability:** Resists the formation of detrimental topologically close-packed (TCP) phases, maintaining ductility and toughness after long-term aging. * **Good Fabricability:** Can be welded, formed, and machined using standard commercial techniques, allowing for the manufacture of complex components. **Conclusion** HAYNES® 230® alloy (UNS N06230) is a top-tier, solid-solution strengthened superalloy that delivers unmatched performance in extreme thermal and corrosive environments. Its optimized chemistry, featuring high tungsten and chromium content along with a lanthanum addition, provides a winning combination of strength, oxidation resistance, and long-term stability. For critical components in aerospace engines, industrial heating, and power generation systems, HAYNES 230 offers a reliable, high-performance solution, fully backed by major international standards like ASTM, ASME, and AMS.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3398 gallon liquid totes Special package is available on request.