Alloy 188,Udimet 188 Other/Similar Specs,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 & Similar Specifications / UNS R30188** **Cobalt-Chromium-Nickel-Tungsten Superalloy - Comprehensive Specifications** --- ### **1. Product Overview** Alloy 188 (commercially known as Udimet 188, Haynes 188, UNS R30188) and its equivalent specifications represent a family of cobalt-based superalloys designed for extreme high-temperature applications. This datasheet covers the various international specifications and equivalent grades that maintain the essential characteristics of this high-performance material, known for its exceptional strength and oxidation resistance up to **1100°C (2012°F)**. --- ### **2. Chemical Composition (Weight %) Comparison** | Element | UNS R30188 | AMS 5772 | ASTM B435 | EN 2.4684 | |---------|-------------|----------|-----------|-----------| | Cobalt | Balance | Balance | Balance | Balance | | Chromium | 20.0-24.0 | 20.0-24.0 | 20.0-24.0 | 20.0-24.0 | | Nickel | 20.0-24.0 | 20.0-24.0 | 20.0-24.0 | 20.0-24.0 | | Tungsten | 13.0-15.0 | 13.0-15.0 | 13.0-15.0 | 13.0-15.0 | | Lanthanum | 0.03-0.12 | 0.03-0.12 | 0.03-0.12 | 0.03-0.12 | | Iron | ≤3.0 | ≤3.0 | ≤3.0 | ≤3.0 | | Carbon | 0.05-0.15 | 0.05-0.15 | 0.05-0.15 | 0.05-0.15 | --- ### **3. Physical Properties** | Property | Value | Condition | |----------|-------|-----------| | Density | 9.13 g/cm³ | 25°C | | Melting Range | 1330-1380°C | - | | Thermal Conductivity | 10.1 W/m·K | 100°C | | Coefficient of Thermal Expansion | 12.3 μm/m·°C | 20-100°C | | Electrical Resistivity | 1.02 μΩ·m | 25°C | | Magnetic Permeability | Essentially non-magnetic | - | --- ### **4. Mechanical Properties Comparison** **Room Temperature Properties (Annealed Condition):** | Specification | Tensile Strength (min) | Yield Strength (min) | Elongation (min) | |---------------|-----------------------|---------------------|-----------------| | UNS R30188 | 965 MPa | 485 MPa | 50% | | AMS 5772 | 965 MPa | 485 MPa | 50% | | ASTM B435 | 965 MPa | 485 MPa | 50% | | EN 2.4684 | 965 MPa | 485 MPa | 50% | **Elevated Temperature Performance:** - Stress Rupture: 48 MPa at 980°C/100h (all specifications) - Creep Strength: 35 MPa at 1000°C/1000h - Maximum Service: 1100°C continuous, 1150°C intermittent --- ### **5. International Standards & Equivalents** **North America:** - UNS R30188 - ASTM B435 (Sheet, Plate, Strip) - ASTM B572 (Rod, Bar) - AMS 5772 (Sheet, Strip, Plate) - AMS 5803 (Bar, Forgings, Rings) - AWS A5.13 (Welding Electrodes) **Europe:** - EN 2.4684 - DIN 2.4684 - ISO 9723 (Aerospace Forgings) **Asia-Pacific:** - JIS H4551 CoCrWNi Alloy - GB/T 15007 (Chinese equivalent) --- ### **6. Product Forms & Specifications** **Wrought Products:** - Sheet & Strip: ASTM B435, AMS 5772 - Plate: ASTM B435, AMS 5772 - Bar & Rod: ASTM B572, AMS 5803 - Wire: ASTM B572 - Tube & Pipe: ASTM B622, B619, B626 **Forged Products:** - Forgings: ASTM B564 - Rings: AMS 5803 - Billets: AMS 5803 --- ### **7. Applications by Industry** **Aerospace:** - Gas turbine combustion chambers - Afterburner components - Exhaust system parts - Turbine seals and shrouds **Power Generation:** - Gas turbine hot section components - Heat exchanger tubing - Boiler components - Nuclear reactor components **Industrial Processing:** - Heat treatment fixtures - Chemical processing equipment - Furnace components - High-temperature fasteners --- ### **8. Equivalent & Similar Alloys** **Direct Equivalents:** - Haynes 188 (USA) - Udimet 188 (USA) - W.-Nr. 2.4684 (Germany) - KC20WN (Specialty Grade) **Similar Performance Alloys:** - Haynes 25/L-605 (Slightly lower temperature capability) - Nimonic 263 (Nickel-based alternative) - Inconel 617 (Similar temperature range) - Hastelloy X (Alternative for some applications) --- ### **9. Quality & Certification** **Standard Certifications:** - Mill Test Certificate EN 10204 3.1/3.2 - ASME Nuclear Certifications - NADCAP Accredited Testing - ISO 9001:2015 Quality Systems **Testing Standards:** - Chemical Analysis: ASTM E1473 - Mechanical Testing: ASTM E8/E21 - Non-destructive Testing: per applicable specifications --- ### **10. Technical Advantages Across Specifications** - **Consistent high-temperature performance** across all specifications - **Excellent oxidation resistance** up to 1150°C - **Superior thermal fatigue resistance** - **Good fabricability and weldability** - **Long-term microstructural stability** - **Proven performance** in extreme environments --- ### **11. Special Notes** - All specifications maintain the essential lanthanum addition for improved oxide scale adhesion - Minor variations in impurity elements may occur between specifications - Heat treatment requirements are consistent across all specifications - All grades are considered essentially equivalent for most applications --- **Note:** While all listed specifications are considered equivalent, specific application requirements may dictate the use of particular standards. Consult with our technical team for guidance on specification selection for your specific 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 2245 gallon liquid totes Special package is available on request.