Alloy 230,Haynes 230,UNS N06230,E FORU

### **Alloy 230 / Haynes® 230 / UNS N06230** **Nickel-Chromium-Tungsten-Molybdenum Superalloy for Extreme Temperature Service

** --- #### **1. Overview

** **Alloy 230**, commercially known as **Haynes® 230**, is a nickel-chromium-tungsten-molybdenum superalloy engineered to deliver an outstanding combination of high-temperature strength, exceptional oxidation resistance (up to 1150°C/2100°F), and excellent long-term thermal stability. This solid-solution strengthened alloy exhibits superior resistance to thermal fatigue, creep deformation, and nitridation, making it particularly suitable for demanding applications in aerospace, industrial heating, and power generation industries. The optimized chemical composition, including carefully controlled additions of lanthanum and boron, provides enhanced performance in both oxidizing and reducing environments. 

 --- #### **2. Chemical Composition (Weight %)** 

 The typical chemical composition of Haynes 230 is outlined below. The balance is Nickel (Ni). 

| Element | Content (%) | Key Function | 

| :--- | :--- | :--- | 

| **Nickel (Ni)** | Balance | Forms the austenitic matrix with excellent high-temperature structural stability and corrosion resistance. | 

| **Chromium (Cr)** | 20.0 - 24.0 | Provides superior oxidation resistance through formation of a protective Cr₂O₃ scale. | 

| **Tungsten (W)** | 13.0 - 15.0 | Primary solid-solution strengthener; enhances high-temperature strength and stability. | 

| **Molybdenum (Mo)** | 1.0 - 3.0 | Enhances solid-solution strengthening and improves resistance to reducing environments. | 

| **Iron (Fe)** | 3.0 max | Controlled impurity. | 

| **Cobalt (Co)** | 5.0 max | Controlled element to minimize activation in nuclear applications. | 

| **Manganese (Mn)** | 0.50 max | Aids in manufacturability. | 

| **Silicon (Si)** | 0.25 - 0.75 | Enhances oxidation resistance through silica formation in protective scales. | 

| **Aluminum (Al)** | 0.20 - 0.50 | Contributes to oxidation resistance through alumina scale formation. | 

| **Carbon (C)** | 0.05 - 0.15 | Forms carbides for grain boundary strengthening. | 

| **Lanthanum (La)** | 0.005 - 0.050 | Dramatically improves oxidation resistance by enhancing scale adhesion. | 

| **Boron (B)** | 0.015 max | Enhances creep strength and grain boundary cohesion. | 

| **Phosphorus (P)** | 0.030 max | - | | **Sulfur (S)** | 0.015 max | - | 

 --- #### **3. Physical Properties** 

| Property | Value / Condition | 

| :--- | :--- | 

| **Density** | 8.97 g/cm³ (0.324 lb/in³) | 

| **Melting Range** | ~ 1300 - 1370 °C (2370 - 2500 °F) | 

| **Mean Coefficient of Thermal Expansion** | 20 - 540°C (68 - 1000°F): **12.8 x 10⁻⁶/°C** (7.1 x 10⁻⁶/°F) | 

| **Thermal Conductivity** | 9.2 W/m·K (64 Btu·in/hr·ft²·°F) at 21°C (70°F)
21.5 W/m·K (149 Btu·in/hr·ft²·°F) at 540°C (1000°F) | 

| **Specific Heat** | 419 J/kg·K (0.100 Btu/lb·°F) at 21°C (70°F) | 

| **Electrical Resistivity** | 1.25 μΩ·m at 21°C (70°F) | 

| **Modulus of Elasticity (Young's Modulus)** | 214 GPa (31.0 x 10⁶ psi) at 21°C (70°F) | 

| **Magnetic Permeability** | Essentially non-magnetic. | 

 --- #### **4. Mechanical Properties 

(Typical for Annealed Condition)**

| Property | At Room Temperature | At 815°C (1500°F) | At 980°C (1800°F) | 

| :--- | :--- | :--- | :--- | 

| **Tensile Strength** | 795 MPa (115 ksi) | 195 MPa (28 ksi) | 83 MPa (12 ksi) | 

| **Yield Strength (0.2% Offset)** | 345 MPa (50 ksi) | 145 MPa (21 ksi) | 62 MPa (9 ksi) | 

| **Elongation (in 50 mm / 2 in)** | 45% | 65% | 85% | 

| **Hardness (Rockwell B)** | 88 HRB | - | - |

 --- #### **5. International Standards

** Haynes 230 is covered by the following international specifications: 

 *   **ASTM:**    

*   **B435:** Plate, Sheet, and Strip    

*   **B572:** Rod/Bar    

*   **B622:** Seamless Pipe and Tube    

*   **B619/B626:** Welded Pipe and Tube 

*   **AMS:**    

*   **AMS 5878:** Sheet, Strip, and Plate 

*   **ASME:**    

*   **SB-435:** Code Case for Pressure Vessel Applications 

*   **UNS:** N06230 

 --- #### **6. Product Applications

** Haynes 230 is widely used in extreme environment applications: 

 *   **Aerospace:

**    *   Combustion chambers and liners    

*   Turbine seals and rings    

*   Afterburner components 

*   **Industrial Furnaces:

**    *   Radiant tubes and retorts    

*   Heat treatment fixtures    

*   Furnace muffles 

*   **Power Generation:

**    *   Gas turbine combustion systems    

*   Heat exchangers    

*   Thermal reactors 

*   **Chemical Processing:

**    *   High-temperature reactors    

*   Catalyst support grids 

 --- #### **7. Key Characteristics & Advantages

** *   **Excellent oxidation resistance** up to 1150°C (2100°F) 

*   **Good high-temperature strength** and creep resistance 

*   **Superior thermal stability

** *   **Excellent resistance to nitridation

** *   **Good fabricability** and weldability 

*   **Long-term performance** in aggressive environments 

 --- **Disclaimer:

** *Haynes® 230 is a registered trademark of Haynes International, Inc. The values provided are typical and for informational purposes only. For critical applications, always consult the official material data sheets from the supplier and relevant design codes.*

Packing of Alloy 230,Haynes 230,UNS N06230

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 1670 gallon liquid totes Special package is available on request.