Alloy 188,Haynes 188 Other/Similar Specs,UNS R30188,E FORU

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

### **Product Technical Data: Alloy 188 (Haynes 188 & Similar Specifications / UNS R30188) Cobalt-Based Superalloy** --- #### **1. Product Overview** **Alloy 188** (commercially known as **Haynes 188**, standardized as **UNS R30188**) represents a premium cobalt-chromium-nickel-tungsten wrought superalloy designed for extreme high-temperature service. This datasheet covers the various product forms and equivalent specifications that maintain the essential characteristics of this high-performance material. The alloy demonstrates exceptional strength retention and environmental resistance at temperatures up to 1100°C (2000°F), making it suitable for the most demanding aerospace, industrial, and energy applications. The material's superior performance stems from its balanced composition featuring high chromium for oxidation resistance, tungsten for solid solution strengthening, and lanthanum for improved scale adhesion. This combination ensures long-term stability and reliability in aggressive high-temperature environments. --- #### **2. Chemical Composition (Weight %)** | Element | Standard Range (%) | Alternative Specs Range (%) | Metallurgical Function | | :--- | :--- | :--- | :--- | | **Cobalt (Co)** | Balance | Balance | Matrix element providing high-temperature strength | | **Chromium (Cr)** | 20.0 - 24.0 | 21.0 - 23.0 | Oxidation and hot corrosion resistance | | **Nickel (Ni)** | 20.0 - 24.0 | 21.0 - 23.0 | Austenitic phase stabilization | | **Tungsten (W)** | 13.0 - 15.0 | 13.5 - 15.0 | Solid solution strengthening | | **Iron (Fe)** | ≤ 3.0 | ≤ 2.0 | Residual element | | **Lanthanum (La)** | 0.03 - 0.12 | 0.04 - 0.10 | Oxide scale adhesion improvement | | **Manganese (Mn)**| ≤ 1.25 | ≤ 0.50 | Sulfur control and workability | | **Silicon (Si)** | ≤ 0.20 | ≤ 0.15 | Residual element | | **Carbon (C)** | 0.05 - 0.15 | 0.08 - 0.12 | Strength enhancement | | **Boron (B)** | ≤ 0.015 | ≤ 0.010 | Grain boundary strengthening | --- #### **3. Physical Properties** | Property | Standard Value | Alternative Specs Value | Condition | | :--- | :--- | :--- | :--- | | **Density** | 9.13 g/cm³ | 9.10-9.15 g/cm³ | 25°C | | **Melting Range** | 1330-1380°C | 1340-1375°C | Liquidus-Solidus | | **Electrical Resistivity** | 1.02 μΩ·m | 1.00-1.05 μΩ·m | 25°C | | **Thermal Conductivity** | 10.1 W/m·K | 9.8-10.5 W/m·K | 100°C | | **Mean Thermal Expansion** | 12.3 μm/m·°C | 12.0-12.5 μm/m·°C | 20-100°C | | **Magnetic Permeability** | <1.01 | <1.005 | Annealed condition | --- #### **4. Mechanical Properties** **Standard Room Temperature Properties (Annealed Condition):** - **Tensile Strength:** 965 MPa min (140 ksi min) - **Yield Strength (0.2% Offset):** 485 MPa min (70 ksi min) - **Elongation:** 50% min - **Reduction of Area:** 60% typical **Alternative Specifications Properties:** - **Tensile Strength:** 895-1100 MPa (130-160 ksi) - **Yield Strength:** 415-550 MPa (60-80 ksi) - **Elongation:** 45-60% **Elevated Temperature Performance:** - **Maximum Service Temperature:** 1150°C (2100°F) - **Stress Rupture Strength:** 48 MPa @ 980°C/100 hours - **Creep Strength:** 35 MPa @ 1000°C/1000 hours - **Excellent thermal fatigue resistance** --- #### **5. Product Forms & Variations** **Standard Product Forms:** - Sheet, Strip, Plate (0.1mm to 100mm thickness) - Bar, Rod, Wire (1mm to 300mm diameter) - Tubing, Pipe (Seamless and welded) - Forgings, Rings, Billets - Fittings, Flanges, Fasteners **Special Variants:** - **Fine Grain Version:** ASTM 6-8 for improved fatigue - **Coarse Grain Version:** ASTM 3-5 for creep resistance - **Special Surface Finishes:** Pickled, ground, polished - **Custom Heat Treatments:** Various aging treatments available --- #### **6. International Standards & Equivalents** | Standard Type | Standard Number | Equivalent Specifications | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS R30188** | - | | **ASTM International** | **ASTM B435** | Sheet, Plate, Strip | | **ASTM International** | **ASTM B572** | Rod, Bar | | **ASTM International** | **ASTM B622** | Seamless Tube | | **Aerospace Material** | **AMS 5772** | Sheet, Strip, Plate | | **Aerospace Material** | **AMS 5803** | Bar, Forgings, Rings | | **European Standard** | **2.4684** | DIN, EN equivalents | | **ISO Standards** | **ISO 9723** | Aerospace forgings | | **Japanese Standard** | **JIS H4551** | CoCrWNi alloy | --- #### **7. Industry Applications** **Aerospace & Defense:** - Gas turbine combustion components - Afterburner systems - Exhaust assemblies - Rocket motor components **Industrial Processing:** - Heat treating fixtures - Furnace components - Chemical processing equipment - Nuclear reactor components **Energy Generation:** - Gas turbine hot sections - Heat recovery systems - Advanced power system components --- #### **8. Alternative & Similar Alloys** **Close Equivalents:** - **Haynes 25 (L-605):** Lower cost alternative with good properties - **Nimonic 263:** Nickel-based alternative - **Inconel 617:** Similar temperature capability - **Haynes 214:** Nickel-based with superior oxidation resistance **Selection Considerations:** - **Temperature Requirements:** 188 excels above 980°C - **Environment:** Superior oxidation/sulfidation resistance - **Fabrication Needs:** Excellent weldability and formability - **Cost Considerations:** Balanced performance vs. cost --- #### **9. Quality Assurance** **Standard Certifications:** - Mill Test Certificates to EN 10204 3.1/3.2 - Material test reports per ASTM/AMS requirements - Third-party inspection available - Origin certification and traceability **Testing Capabilities:** - Chemical analysis - Mechanical testing - Non-destructive examination - Microstructural evaluation - High-temperature testing --- #### **Technical Summary** **Alloy 188 (Haynes 188 / UNS R30188)** and its equivalent specifications offer a versatile high-temperature solution across multiple industries and applications. The material's consistent performance, availability in numerous product forms, and comprehensive standardization make it a preferred choice for engineers designing components for extreme temperature service. Understanding the various specifications and their subtle differences enables optimal material selection for specific application requirements, ensuring reliable performance in the most challenging operating environments.

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 2232 gallon liquid totes Special package is available on request.