Alloy 188,Udimet 188 ,UNS R30188,E FORU

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

### **Technical Data Sheet: Alloy 188 / Udimet 188 / UNS R30188** **Cobalt-Chromium-Nickel-Tungsten Superalloy** --- #### **1. Overview** **Alloy 188** (commonly known as **Udimet 188** or **Haynes 188**, UNS R30188) is a **cobalt-based wrought superalloy** renowned for its exceptional high-temperature strength, outstanding oxidation resistance, and excellent sulfidation resistance. It is designed for prolonged service at temperatures up to **1100°C (2012°F)**, making it ideal for extreme environments in aerospace, power generation, and industrial processing. --- #### **2. Chemical Composition (Weight %)** | Element | Content (%) | Role | |---------|-------------|------| | **Cobalt (Co)** | Balance | Base matrix, provides high-temperature stability | | **Chromium (Cr)** | 20.0–24.0 | Oxidation/sulfidation resistance | | **Nickel (Ni)** | 20.0–24.0 | Austenitic stabilization & ductility | | **Tungsten (W)** | 13.0–15.0 | Solid-solution strengthening | | **Lanthanum (La)** | 0.03–0.12 | Improves oxide scale adhesion | | **Iron (Fe)** | ≤ 3.0 | Residual | | **Manganese (Mn)** | ≤ 1.25 | Improves hot workability | | **Silicon (Si)** | ≤ 0.20 | Residual | | **Carbon (C)** | 0.05–0.15 | Carbide formation for strength | | **Boron (B)** | ≤ 0.015 | Grain boundary strengthening | --- #### **3. Physical Properties** | Property | Value | |----------|-------| | **Density** | 9.13 g/cm³ | | **Melting Range** | 1330–1380°C (2426–2516°F) | | **Thermal Conductivity** | 10.1 W/m·K at 100°C | | **Coefficient of Thermal Expansion** | 12.3 µm/m·°C (20–100°C) | | **Electrical Resistivity** | 1.02 µΩ·m at 21°C | | **Magnetic Permeability** | Essentially non-magnetic | --- #### **4. Mechanical Properties** **Room Temperature (Annealed Condition):** - **Tensile Strength**: ≥ 965 MPa (140 ksi) - **Yield Strength (0.2% Offset)**: ≥ 485 MPa (70 ksi) - **Elongation**: ≥ 50% - **Hardness**: ≤ 90 HRB **Elevated Temperature Performance:** - **Useful Strength Range**: Up to 1100°C (2012°F) - **Stress Rupture Strength**: ~48 MPa at 980°C for 100 hours - **Excellent creep and thermal fatigue resistance** --- #### **5. Applications** **Aerospace & Defense:** - Gas turbine combustors - Afterburner components - Exhaust system parts - Turbine seals and shrouds **Industrial & Energy:** - Heat treatment furnace fixtures - Radiant tubes & heat exchangers - Nuclear reactor components - Chemical processing hardware **Other Uses:** - Fasteners for high-temperature service - Welding consumables for similar alloys --- #### **6. International Standards** | Standard | Specification | |----------|---------------| | **UNS** | R30188 | | **ASTM** | B435 (Sheet/Plate), B572 (Bar) | | **AMS** | 5772 (Sheet/Strip/Plate), 5803 (Bar/Forgings) | | **ISO** | 9723 (Aerospace Forgings) | | **EN/DIN** | 2.4684 | | **AWS** | A5.13 (Welding Electrodes) | --- #### **7. Fabrication Notes** - **Welding**: Excellent weldability using GTAW, GMAW, SMAW with matching filler. - **Forming**: Good cold and hot formability in annealed condition. - **Heat Treatment**: Solution anneal at 1230°C (2250°F), then rapid cool. - **Machining**: Use slow speeds, heavy feeds, and sharp carbide tools. --- #### **8. Why Choose Alloy 188?** Alloy 188 delivers a unique balance of: - **High-temperature strength** without precipitation hardening - **Superior environmental resistance** in oxidizing/sulfidizing atmospheres - **Excellent fabricability** for complex components - **Long-term microstructural stability** at elevated temperatures --- **Contact us** for detailed technical assistance or custom forms of Alloy 188 tailored to your application needs.

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 2235 gallon liquid totes Special package is available on request.