Alloy 188,Haynes 188 Bar(Round bar, Flat bar),UNS R30188,E FORU

British Specs:，American Specs: AMS 5608 Sheet, Strip and Plate AMS 5801 Welding Wire，German Specs:

### **Product Introduction: Alloy 188 (Haynes 188 Bar / UNS R30188) Cobalt-Based Superalloy** **Overview** Alloy 188 (commercially known as **Haynes 188**, and standardized as **UNS R30188**) is a cobalt-chromium-nickel-tungsten wrought superalloy designed for extreme temperature and corrosive environments. It offers an exceptional combination of high-temperature strength, outstanding resistance to oxidation and sulfidation, and excellent fabricability. As a solution-strengthened alloy, it retains its properties over long periods of exposure without significant aging effects. The **Haynes 188 Bar** product form, including **Round Bar** and **Flat Bar**, is specifically engineered for machining and fabrication into critical components that must withstand severe thermal and mechanical stress. Its high chromium content provides a protective oxide scale, while the addition of Lanthanum (La) dramatically improves scale adhesion under cyclic thermal conditions. --- #### **1. Chemical Composition (Weight %)** The composition conforms to standard specifications for Alloy 188 bar. | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Base matrix providing solid solution strength and thermal fatigue resistance. | | **Chromium (Cr)** | 20.0 - 24.0 | Confers exceptional oxidation, sulfidation, and hot corrosion resistance. | | **Nickel (Ni)** | 20.0 - 24.0 | Stabilizes the austenitic (FCC) matrix and enhances fabricability. | | **Tungsten (W)** | 13.0 - 15.0 | Primary solid solution strengthener for high-temperature strength. | | **Iron (Fe)** | ≤ 3.0 | Residual element. | | **Lanthanum (La)** | 0.03 - 0.12 | Improves oxide scale adhesion and resistance to spallation during thermal cycling. | | **Manganese (Mn)**| ≤ 1.25 | Aids in sulfur control and hot workability. | | **Silicon (Si)** | ≤ 0.20 | Residual element. | | **Carbon (C)** | 0.05 - 0.15 | Contributes to strength via minor carbide formation. | | **Boron (B)** | ≤ 0.015 | Strengthens grain boundaries. | | **Phosphorus (P)**| ≤ 0.020 | Impurity control. | | **Sulfur (S)** | ≤ 0.015 | Impurity control. | --- #### **2. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 9.13 g/cm³ (0.330 lb/in³) | | **Melting Range** | 1330 - 1380 °C (2425 - 2515 °F) | | **Electrical Resistivity** | 1.02 μΩ·m at 21°C | | **Thermal Conductivity** | 10.1 W/m·K at 100°C | | **Thermal Expansion Coefficient** | 12.3 μm/m·°C (20 - 100°C) | | **Magnetic Permeability**| Essentially non-magnetic | --- #### **3. Mechanical Properties (Typical for Annealed Bar)** **Room Temperature Properties:** * **Tensile Strength:** 965 MPa (140 ksi) min * **Yield Strength (0.2% Offset):** 485 MPa (70 ksi) min * **Elongation:** 50% min **Elevated Temperature Strength:** Alloy 188 bar retains a significant portion of its strength at high temperatures, making it suitable for structural applications. * **Stress Rupture Strength (980°C / 1800°F):** ~ 48 MPa (7 ksi) for 100 hours life. --- #### **4. Product Applications** **Haynes 188 Bar (Round & Flat)** is machined into components for the most demanding applications across various industries: * **Aerospace & Gas Turbines:** * Turbine vanes and shrouds * Afterburner components * Combustion chamber liners (fabricated from bar stock) * High-temperature fasteners, bolts, and pins (machined from round bar) * **Industrial Gas Turbines & Power Generation:** * Transition ducts and seals * Burner components and nozzle rings * Heat exchanger parts * **Heat Treating Industry:** * Furnace fixtures, rails, and rollers (machined from round and flat bar) * Tray and basket components for carburizing and brazing * Muffles and radiant tubes * **General Engineering:** * **Round Bar:** Ideal for shafts, valves, and spindles operating in high-temperature environments. * **Flat Bar:** Used for structural supports, brackets, and custom fabrications where high-temperature strength is critical. --- #### **5. International Standards** The bar product form of Alloy 188 is covered by the following key international standards: | Standard Type | Standard Number | Title / Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | Universal material designation. | | **ASTM International** | **ASTM B572** | Standard Specification for **Rod and Bar** of UNS R30188. | | **Aerospace Material Spec.** | **AMS 5803** | **Bar, Forgings, and Rings**, Cobalt Alloy, 20Cr-22Ni-14W-3Fe-2La, Solution Heat Treated. | | **Aerospace Material Spec.** | **AMS 5772** | Sheet, Strip, and Plate. *(Reference for other forms)* | | **ISO (International)** | **ISO 5832-8** | Implants for surgery - Wrought cobalt-chromium-nickel-molybdenum-iron alloy. *(Note: Composition is similar, but application-specific grades may vary.)* | | **EN (European)** | **2.4684** | Material number under the European standard designation system. | --- **Summary** **Haynes 188 Bar (UNS R30188)** in round and flat forms is a versatile, high-performance material for manufacturing critical components. Its superior high-temperature strength, exceptional environmental resistance, and excellent machinability in the annealed condition make it an ideal choice for pushing the limits of performance in aerospace, power generation, and high-temperature industrial systems.

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 2224 gallon liquid totes Special package is available on request.