Alloy 188,Haynes 188 Pipe,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 Pipe / UNS R30188) Cobalt-Based Superalloy** **Overview** **Alloy 188** (commercially known as **Haynes 188**, and standardized as **UNS R30188**) is a premier cobalt-chromium-nickel-tungsten wrought superalloy. It is engineered to deliver exceptional performance in the most demanding high-temperature and corrosive environments. The **Haynes 188 Pipe** product form is specifically manufactured for applications involving the transport of hot, aggressive gases or fluids, or for use in high-temperature structural systems. This solution-strengthened alloy derives its properties from a stable austenitic (face-centered cubic) matrix, fortified with high levels of chromium for corrosion resistance and tungsten for strength. The critical addition of Lanthanum (La) ensures superior resistance to oxide scale spallation during thermal cycling, which is vital for the long-term integrity of piping systems. --- #### **1. Chemical Composition (Weight %)** The chemical composition of Haynes 188 Pipe conforms to the following standard specifications: | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Provides the base matrix with exceptional thermal fatigue resistance and solid solution strength. | | **Chromium (Cr)** | 20.0 - 24.0 | Imparts outstanding resistance to oxidation, sulfidation, and hot corrosion. | | **Nickel (Ni)** | 20.0 - 24.0 | Stabilizes the austenitic structure and enhances fabricability and weldability. | | **Tungsten (W)** | 13.0 - 15.0 | A potent solid solution strengthener, crucial for 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 cyclic oxidation life. | | **Manganese (Mn)**| ≤ 1.25 | Aids in hot workability and controls sulfur. | | **Silicon (Si)** | ≤ 0.20 | Residual element. | | **Carbon (C)** | 0.05 - 0.15 | Enhances 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 Pipe exhibits excellent strength retention at elevated temperatures, ensuring structural integrity under pressure and thermal load. **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 maintains useful tensile and creep-rupture strength up to approximately **1100°C (2000°F)**. * It offers excellent structural stability for long-term service in the 980-1100°C (1800-2000°F) range. --- #### **4. Product Applications** **Haynes 188 Pipe** is specified for critical high-temperature piping and tubing systems in aerospace and industrial sectors: * **Aerospace & Defense:** * **Afterburner and Jet Engine Ducting:** For transporting high-pressure, high-temperature combustion gases. * **Exhaust Systems:** Components for military aircraft and high-performance turbines. * **Heat Exchanger Tubing:** In environmental control and thermal management systems. * **Industrial Gas Turbines:** * **Transition Ducts:** Guiding hot combustion gases from the combustor to the turbine section. * **Interconnector Pipes:** Linking various sections of the hot gas path. * **Heat Processing & Power Generation:** * **Radiant Tubes:** For carburizing, annealing, and brazing furnaces. * **Transfer Pipes:** For conveying hot, corrosive gases in chemical processing and waste incineration systems. * **High-Temperature Instrumentation Tubing:** For thermowells and sensor conduits. * **Nuclear Power:** * **Heat Exchanger Tubing** in advanced gas-cooled reactor systems. --- #### **5. International Standards** Haynes 188 Pipe is covered by several international standards governing its chemical and mechanical properties. | Standard Type | Standard Number | Title / Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | The universal material identifier. | | **ASTM International** | **ASTM B619** | Standard Specification for **Welded Pipe** (UNS R30188). | | **ASTM International** | **ASTM B622** | Standard Specification for **Seamless Pipe and Tube** (UNS R30188). | | **ASTM International** | **ASTM B626** | Standard Specification for **Welded Tube** (UNS R30188). | | **Aerospace Material Spec. (AMS)** | **AMS 5772** | Sheet, Strip, and Plate. *(Reference for fabricated pipe components)* | | **Aerospace Material Spec. (AMS)** | **AMS 5803** | Bar, Forgings, and Rings. *(Reference for pipe fittings and flanges)* | | **ASME Boiler & Pressure Vessel Code**| **SB-619, SB-622, SB-626** | Approved for use in pressure-boundary applications under the ASME code. | | **EN (European)** | **2.4684** | Material number under the European standard designation system. | --- **Summary** **Haynes 188 Pipe (UNS R30188)** is a premium, high-performance solution for piping systems operating under extreme thermal and corrosive conditions. Its unique combination of high-temperature strength, exceptional oxidation/sulfidation resistance, and superior thermal fatigue resistance makes it an indispensable material for advancing technology in aerospace propulsion, industrial heating, and power generation. The availability in both seamless and welded forms provides design flexibility for critical high-temperature fluid and gas transport applications.

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 2225 gallon liquid totes Special package is available on request.