Alloy 22，Hastelloy C-22 ，UNS N06022,E FORU

British Specs:，American Specs:，German Specs:WS 2.4602

### **Product Introduction: Alloy 22 (Hastelloy® C-22 / UNS N06022)** **The Ultimate Solution for Severe Corrosive Environments** **Hastelloy® C-22** (UNS N06022) is a nickel-chromium-molybdenum-tungsten alloy renowned for its exceptional, versatile corrosion resistance. It is designed to handle the most aggressive chemical environments, including strong oxidizers, reducing acids, and localized attacks such as pitting, crevice corrosion, and stress corrosion cracking. Its superior thermal stability and excellent fabrication characteristics make it a premier choice for critical applications in the chemical processing, pollution control, and industrial sectors where equipment longevity and reliability are paramount. As a versatile nickel-based alloy, Alloy 22 offers a significant performance advantage over stainless steels and other nickel alloys in a wide range of severe conditions. --- #### **1. Chemical Composition (Weight %)** The balanced composition is the key to its all-around corrosion resistance. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 20.0 - 22.5 | | **Molybdenum (Mo)** | 12.5 - 14.5 | | **Tungsten (W)** | 2.5 - 3.5 | | **Iron (Fe)** | 2.0 - 6.0 | | **Cobalt (Co)** | 2.0 max | | **Vanadium (V)** | 0.35 max | | **Silicon (Si)** | 0.08 max | | **Manganese (Mn)** | 0.50 max | | **Carbon (C)** | 0.015 max | | **Phosphorus (P)** | 0.02 max | | **Sulfur (S)** | 0.02 max | *Key Feature:* The optimized balance of **Chromium** (for oxidizing media) and **Molybdenum & Tungsten** (for reducing media) provides unmatched resistance to a broad spectrum of corrodents. The low **Carbon** and **Silicon** content minimizes susceptibility to intergranular attack. --- #### **2. Physical Properties** | Property | Value | | :--- | :--- | | **Density** | 0.315 lb/in³ (8.69 g/cm³) | | **Melting Point** | 1350 - 1380°C (2460 - 2520°F) | | **Specific Heat** | 0.095 Btu/lb-°F (398 J/kg-°K) at 70°F (21°C) | | **Thermal Conductivity** | 6.5 Btu-ft/hr-ft²-°F (11.2 W/m·K) at 70°F (21°C) | | **Mean Coefficient of Thermal Expansion** | 7.8 x 10⁻⁶ per °F (14.0 x 10⁻⁶ per °K) from 70-200°F | | **Modulus of Elasticity (Tension)** | 29.5 x 10⁶ psi (203 GPa) | --- #### **3. Mechanical Properties (Typical for Annealed Condition)** | Property | Typical Value at Room Temperature | | :--- | :--- | | **Tensile Strength** | 110 ksi (758 MPa) | | **Yield Strength (0.2% Offset)** | 52 ksi (358 MPa) | | **Elongation** | 65% | | **Hardness** | Rb 90 | *Note:* Alloy 22 has excellent ductility and can be cold worked to significantly higher strength levels. --- #### **4. Corrosion Resistance & Product Applications** Alloy 22 is the material of choice for handling the most challenging corrosive environments across multiple industries. * **Excellent Resistance To:** * **Oxidizing Acids:** Nitric acid, Aqua Regia, other oxidizing chlorides. * **Reducing Acids:** Hydrochloric acid, Sulfuric acid (in various concentrations). * **Localized Corrosion:** Superior resistance to pitting and crevice corrosion in chloride-containing solutions. * **Stress Corrosion Cracking (SCC):** Highly resistant to chloride-induced SCC. * **Mixed Acids:** Handles complex mixtures like HNO₃/HF used in pickling and acid cleaning. * **Industry Applications:** * **Chemical Processing Industry (CPI):** * Reactors, vessels, and columns * Heat exchangers, condensers, and piping systems * Agitators and shafts for aggressive chemical mixtures * **Pollution Control & Flue Gas Desulfurization (FGD):** * Scrubbers, dampers, ducting, and stack liners in power plants * Handles hot, wet, chloride-laden gases and acidic condensates * **Pharmaceutical & Fine Chemical:** * Process equipment requiring high purity and resistance to corrosive cleaning agents * Lined reactors and vessels * **Waste Processing:** * Critical components in nuclear waste containment and processing systems * Equipment for handling hazardous chemical waste * **Pulp & Paper Industry:** * Digesters, bleach plants, and other equipment exposed to corrosive chlorine compounds. --- #### **5. International Standards** Hastelloy C-22 is covered by a wide range of international product and material standards. **Material Standards:** * **UNS:** **UNS N06022** * **ASTM:** ASTM B574 (Rod & Bar), ASTM B575 (Sheet, Plate, Strip), ASTM B622 (Seamless Pipe & Tube), ASTM B619/B626 (Welded Pipe & Tube) * **ASME:** SA SB-574, SA SB-575, SA SB-622, SA SB-619/SB-626 (Code Case 2157) * **EURONORM:** **2.4602** * **DIN:** DIN 17744 - NiCr21Mo14W * **ISO:** ISO 15156-3 / NACE MR0175 (for use in sour service environments) **Common Product Forms:** * Sheet, Plate, Strip * Seamless and Welded Pipe & Tube * Bar, Wire, and Billet * Fittings (Flanges, Elbows, Tees) and Forgings --- #### **Why Choose Our Hastelloy C-22 Products?** * **Unmatched Corrosion Versatility:** Provides the widest resistance spectrum of any nickel-based alloy in its class, reducing the risk of material failure. * **Superior Fabricability:** Excellent weldability and formability allow for the construction of complex and robust process equipment. * **Proven Performance:** A long and successful history in the world's most demanding industrial applications. * **Full Traceability:** All materials are supplied with complete Mill Test Certificates (MTC/CMTR) verifying compliance with ASTM, ASME, and other specified standards. * **Technical Expertise:** Our team provides support for material selection, fabrication guidelines, and welding procedure development. **Hastelloy® C-22 is the benchmark for handling severe corrosion. Contact us today to discuss how it can provide a reliable and cost-effective solution for your most challenging application.** *Hastelloy® is a registered trademark of Haynes International Inc.*

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 2729 gallon liquid totes Special package is available on request.