Alloy 188,Haynes 188 Tube,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 Tube / 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 renowned for its exceptional high-temperature strength, outstanding resistance to oxidation and sulfidation, and excellent fabricability. The **Haynes 188 Tube** product form is specifically engineered for applications involving the conveyance of hot, corrosive gases or fluids, as well as for use in high-temperature heat exchangers and structural components. As a solution-strengthened alloy, it maintains its mechanical properties and microstructural stability over prolonged periods at elevated temperatures. Its high chromium content provides a protective oxide scale, while the critical addition of Lanthanum (La) ensures exceptional resistance to scale spallation during thermal cycling, a critical property for the longevity of thin-walled tubular components. --- #### **1. Chemical Composition (Weight %)** The chemical composition of Haynes 188 Tube is meticulously controlled to meet international standards. | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Provides the base matrix with superior solid solution strength and thermal fatigue resistance. | | **Chromium (Cr)** | 20.0 - 24.0 | Confers exceptional resistance to oxidation, sulfidation, and hot corrosion. | | **Nickel (Ni)** | 20.0 - 24.0 | Stabilizes the austenitic (FCC) matrix, enhancing fabricability and weldability. | | **Tungsten (W)** | 13.0 - 15.0 | A primary solid solution strengthener, providing high-temperature creep strength. | | **Iron (Fe)** | ≤ 3.0 | Residual element. | | **Lanthanum (La)** | 0.03 - 0.12 | Dramatically improves oxide scale adhesion, preventing spallation and extending service life under thermal cycling. | | **Manganese (Mn)**| ≤ 1.25 | Aids in hot workability and sulfur control. | | **Silicon (Si)** | ≤ 0.20 | Residual element. | | **Carbon (C)** | 0.05 - 0.15 | Contributes to strength through 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 Condition)** Haynes 188 Tube offers a robust combination of strength and ductility, essential for forming and operating under pressure at high temperatures. **Room Temperature Properties (Typical):** * **Tensile Strength:** 965 MPa (140 ksi) * **Yield Strength (0.2% Offset):** 485 MPa (70 ksi) * **Elongation:** 50% **Elevated Temperature Performance:** * The alloy retains significant strength and exhibits excellent creep-rupture properties up to approximately **1100°C (2000°F)**. * It is particularly suited for long-term service in the **980-1100°C (1800-2000°F)** range. --- #### **4. Product Applications** **Haynes 188 Tube** is specified for critical applications across aerospace, industrial, and energy sectors where reliability under extreme conditions is paramount. * **Aerospace & Defense:** * **Jet Engine Exhaust Ducts and Manifolds:** For transporting high-temperature exhaust gases. * **Afterburner Components:** Fuel injection and cooling lines. * **Environmental Control System (ECS) Ducting:** In high-temperature zones of aircraft. * **Hydraulic and Instrumentation Tubing** for high-temperature zones. * **Industrial Gas Turbines:** * **Combustion Liners and Transition Ducts:** Often fabricated from tubular segments. * **Fuel Nozzle Assemblies:** Where high-temperature strength and corrosion resistance are critical. * **Heat Exchangers & Power Generation:** * **Tubing for High-Temperature Heat Exchangers:** In chemical processing, waste heat recovery, and nuclear systems (e.g., gas-cooled reactors). * **Boiler Tubing** for advanced, high-efficiency power plants. * **Radiant Tubes** for heat treating furnaces. * **Chemical Processing:** * **Transfer Lines** for hot, corrosive process streams. --- #### **5. International Standards** Haynes 188 Tube is manufactured to meet the following key international standards, ensuring quality and performance consistency. | Standard Type | Standard Number | Title / Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | The universal material identifier. | | **ASTM International** | **ASTM B622** | Standard Specification for **Seamless Pipe and Tube**. | | **ASTM International** | **ASTM B626** | Standard Specification for **Welded Tube**. | | **ASTM International** | **ASTM B619** | Standard for **Welded Pipe** (often applicable to larger diameter tubing). | | **Aerospace Material Spec. (AMS)** | **AMS 5772** | Sheet, Strip, and Plate. *(Reference for fabricated tubular components)* | | **Aerospace Material Spec. (AMS)** | **AMS 5803** | Bar, Forgings, and Rings. *(Reference for tube fittings)* | | **ASME Boiler & Pressure Vessel Code**| **SB-622, SB-626** | Approved for use in code-regulated pressure-boundary applications. | | **EN (European)** | **2.4684** | Material number under the European standard designation system. | --- **Summary** **Haynes 188 Tube (UNS R30188)** represents a high-integrity material solution for the most challenging thermal and corrosive environments. Its superior balance of high-temperature mechanical properties, exceptional environmental resistance, and good manufacturability into both seamless and welded tubular forms makes it a first-choice material for critical applications in aerospace propulsion, power generation, and high-temperature industrial processing.

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 2226 gallon liquid totes Special package is available on request.