Alloy X,Inconel HX,UNS N06002,EFORU

### **Technical Datasheet: Alloy HX (Hastelloy X, Inconel HX, UNS N06002)** 

 **Introduction** Alloy HX, most commonly known by its trade name **Hastelloy X**, is a nickel-chromium-iron-molybdenum alloy renowned for its exceptional high-temperature strength and outstanding oxidation resistance. It is a solid-solution strengthened alloy, meaning it derives its strength not from precipitation hardening, but from the direct effect of its alloying elements dissolved in the nickel matrix. This gives it excellent fabricability and structural stability. It is a premier material for high-temperature applications in aggressive environments, particularly in the hot sections of gas turbine engines and industrial heating systems. 

### **Technical Datasheet: Alloy HX (Hastelloy X, Inconel HX, UNS N06002)** 

 **Introduction** Alloy HX, most commonly known by its trade name **Hastelloy X**, is a nickel-chromium-iron-molybdenum alloy renowned for its exceptional high-temperature strength and outstanding oxidation resistance. It is a solid-solution strengthened alloy, meaning it derives its strength not from precipitation hardening, but from the direct effect of its alloying elements dissolved in the nickel matrix. This gives it excellent fabricability and structural stability. It is a premier material for high-temperature applications in aggressive environments, particularly in the hot sections of gas turbine engines and industrial heating systems. 

 **Key Features** *   

**Excellent High-Temperature Strength:

** Outstanding creep and rupture strength up to 1200°C (2200°F). *   

**Superior Oxidation Resistance:

** Forms a stable, protective chromium oxide scale that resists spalling, providing long-term protection in air and combustion atmospheres. *   

**Good Fabricability & Weldability:

** Can be readily formed, machined, and welded using standard techniques, making it versatile for complex component manufacturing. *   

**Resistance to Reducing Atmospheres:

** The high molybdenum content provides good resistance to sulfidizing environments. 

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

** The typical composition of Hastelloy X is specified in various international standards. The following is a representative range: 

 | Element | Minimum (%) | Maximum (%) | 

| :--- | :--- | :--- | 

| **Nickel (Ni)** | Balance | - |

 | **Chromium (Cr)** | 20.5 | 23.0 | 

| **Iron (Fe)** | 17.0 | 20.0 | 

| **Molybdenum (Mo)** | 8.0 | 10.0 | 

| **Cobalt (Co)** | 0.5 | 2.5 | 

| **Tungsten (W)** | 0.2 | 1.0 | 

| **Carbon (C)** | 0.05 | 0.15 | 

| **Manganese (Mn)** | - | 1.00 | 

| **Silicon (Si)** | - | 1.00 | 

| **Phosphorus (P)** | - | 0.040 | 

| **Sulfur (S)** | - | 0.030 | 

| **Boron (B)** | - | 0.010 |

 *The alloy is strengthened by a combination of solid-solution strengthening (from Cr, Mo, W) and carbide precipitation (primarily M₂₃C₆) at grain boundaries, which enhances creep strength.* 

 2. Physical Properties** 

 | Property | Value | 

| :--- | :--- | 

| **Density** | 8.22 g/cm³ (0.297 lb/in³) | 

| **Melting Range** | ~ 1260 - 1355 °C (~ 2300 - 2475 °F) |

| **Specific Heat (20°C)** | ~ 450 J/kg·K | 

| **Thermal Conductivity (20°C)** | ~ 9.6 W/m·K | 

| **Mean Coefficient of Thermal Expansion (20-100°C)** | ~ 12.6 µm/m·°C | 

| **Modulus of Elasticity (Young's Modulus)** | ~ 205 GPa (29.7 x 10⁶ psi) | 

 --- #### **3. Mechanical Properties (Typical for Annealed Condition)** 

 Hastelloy X is typically used in the solution annealed condition. **Room Temperature:** *   

**Tensile Strength:** ≥ 655 MPa (95 ksi) *   

**Yield Strength (0.2% Offset):** ≥ 240 MPa (35 ksi) *   

**Elongation:** ≥ 35% **At 870°C (1600°F):** *   

**Tensile Strength:** ~ 175 MPa (25 ksi) *   

**Yield Strength (0.2% Offset):** ~ 145 MPa (21 ksi) *   

**Creep-Rupture Strength (1000 hrs to rupture):** Excellent, a key reason for its selection. 

 --- #### **4. International Standards** 

 Alloy HX is covered by major international standards from ASTM, AMS, and others. 

 | Product Form | Standard Examples |

 | :--- | :--- | | **Plate, Sheet, Strip** | **AMS 5536**, **ASTM B435** | 

| **Bar, Wire, Forgings** | **AMS 5759** (Bar), **AMS 5798** (Wire for Welding) | 

| **Tubing** | **ASTM B435**, **ASTM B622** (Seamless) | 

| **European Standard** | **EN 10095: NiCr22Fe18Mo** (Similar but not identical) | 

| **Unified Numbering System** | **UNS N06002** | 

| **ISO Standard** | **ISO 15156-3 / NACE MR0175** (Approved for sour service) | 

5. Product Applications** 

 Hastelloy X is a critical material in the hottest sections of turbines and high-temperature industrial systems. *   

**Aerospace & Jet Engines:**    *   

**Combustion Liners** and **Flame Holders**    *   

**Afterburner Components**    *   

**Turbine Casings** and **Transition Ducts**    *   

**Spray Bars** and **Nozzles** *   

**Industrial Gas Turbines (IGT):**    *   

**Combustion Chambers**    *   

**Transition Pieces**    *   

**Heat Shields** *   

**Industrial Furnaces & Heat Treatment:**    *   

**Radiant Tubes**, **Muffles**, and **Retorts**    *  

 **Furnace Rollers** and **Baskets**    *   

**Heat Exchangers** for high-temperature processing *   

**Pollution Control:**    *   

**Incinerator Components** --- 

 **Conclusion** 

Alloy HX (Hastelloy X, UNS N06002) is a premier solid-solution strengthened, nickel-based superalloy specifically engineered for extreme temperature and corrosive environments. Its unmatched combination of high oxidation resistance, exceptional creep-rupture strength, and excellent fabricability has made it a benchmark material for combustion sections of turbines and high-temperature industrial equipment for decades. It remains a first-choice material where long-term reliability under thermal stress is paramount.

Packing of Alloy HX (Hastelloy X, UNS N06002)

 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 1640 gallon liquid totes Special package is available on request.