Alloy 188,Udimet 188 Fittings,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 Fittings / UNS R30188** **Cobalt-Chromium-Nickel-Tungsten Superalloy Fittings** --- ### **1. Product Overview** Alloy 188 Fittings (commercially known as Udimet 188 Fittings or Haynes 188 Fittings, UNS R30188) are precision-engineered components manufactured from cobalt-based superalloy for high-temperature piping systems. These fittings maintain excellent mechanical strength and oxidation resistance at temperatures up to **1100°C (2012°F)**, providing reliable performance in critical fluid and gas handling applications under extreme conditions. --- ### **2. Chemical Composition (Weight %)** | Element | Content (%) | Key Role | |---------|-------------|----------| | Cobalt (Co) | Balance | High-temperature stability | | Chromium (Cr) | 20.0–24.0 | Oxidation resistance | | Nickel (Ni) | 20.0–24.0 | Austenitic stabilization | | Tungsten (W) | 13.0–15.0 | Solid-solution strengthening | | Lanthanum (La) | 0.03–0.12 | Scale adhesion improvement | | Iron (Fe) | ≤ 3.0 | Residual | | Manganese (Mn) | ≤ 1.25 | Hot workability | | Silicon (Si) | ≤ 0.20 | Residual | | Carbon (C) | 0.05–0.15 | Carbide formation | | Boron (B) | ≤ 0.015 | Grain boundary strength | --- ### **3. Physical Properties** | Property | Value | |----------|-------| | Density | 9.13 g/cm³ | | Melting Range | 1330–1380°C | | 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 | | Magnetic Permeability | Essentially non-magnetic | --- ### **4. Mechanical Properties** **Room Temperature Properties:** - Tensile Strength: 965 MPa min - Yield Strength (0.2% Offset): 485 MPa min - Elongation: 50% min - Hardness: 85–100 HRB **High-Temperature Capability:** - Maximum Service Temperature: 1100°C - Stress Rupture Strength: 48 MPa at 980°C/100h - Excellent creep and thermal fatigue resistance --- ### **5. Product Range & Specifications** **Available Fitting Types:** - Elbows (45°, 90°, 180°) - Tees (Equal and Reducing) - Reducers (Concentric and Eccentric) - Caps and Stub Ends - Crosses and Laterals **Size Range:** - 1/8" to 12" NPS - Schedule 5S to XXS - Buttweld, Socket Weld, and Threaded configurations **Standards Compliance:** - ASME B16.9, B16.11, B16.28 - MSS SP-43, SP-75 - ISO 4144, ISO 1127 --- ### **6. Applications** **Aerospace & Defense:** - Jet engine fuel systems - Afterburner fuel manifolds - Hydraulic system components - Environmental control systems **Power Generation:** - Gas turbine fuel circuits - Heat recovery systems - Boiler feed systems - Nuclear instrumentation lines **Industrial Processing:** - Chemical process piping - Refinery heater systems - High-temperature heat exchangers - Furnace gas systems --- ### **7. International Standards** | Standard Type | Standard Number | Application | |---------------|-----------------|-------------| | UNS | R30188 | Material designation | | ASTM | B366 | Factory-made wrought fittings | | ASME | SB-366 | Pressure vessel applications | | ASTM | B572 | Rod and bar (raw material) | | AMS | 5803 | Bar, forgings, and rings | | EN/DIN | 2.4684 | European designation | --- ### **8. Fabrication & Installation** **Manufacturing Methods:** - Hot forging and machining - Precision casting - Cold forming processes **Welding Requirements:** - GTAW process recommended - AWS A5.13 ERCoCr-A filler metal - Post-weld heat treatment: 1230°C solution anneal **Installation Guidelines:** - Proper alignment during welding - Adequate support for thermal expansion - Compatibility with connected piping materials --- ### **9. Quality Assurance** **Testing & Certification:** - Material traceability documentation - Dimensional verification per applicable standards - Liquid penetrant or magnetic particle inspection - Pressure testing as required - PMI verification available **Quality Standards:** - ISO 9001:2015 certified manufacturing - NACE MR0175 compliant - PED 2014/68/EU certified --- ### **10. Technical Advantages** - Superior high-temperature strength retention - Excellent oxidation and corrosion resistance - Good thermal fatigue resistance - Maintains mechanical properties under thermal cycling - Long service life in extreme environments - Reliable performance in pressure applications --- **Note:** All fittings are supplied with full material certification and are manufactured according to applicable international standards. Custom configurations and special requirements are available upon request. Consult with our engineering team for specific application recommendations.

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 2243 gallon liquid totes Special package is available on request.