Alloy 188,Udimet 188 Tube,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 Tube / UNS R30188** **Cobalt-Chromium-Nickel-Tungsten Superalloy Tubular Products** --- #### **1. Product Overview** **Alloy 188 Tube** (commercially known as **Udimet 188 Tube** or **Haynes 188 Tube**, UNS R30188) represents the tubular form of this premium cobalt-based superalloy, designed for high-temperature applications requiring exceptional strength and corrosion resistance. These tubes maintain excellent mechanical properties and oxidation resistance at temperatures up to **1100°C (2012°F)**, making them suitable for critical heat transfer, instrumentation, and structural applications in extreme environments. --- #### **2. Chemical Composition (Weight %)** | Element | Content (%) | Metallurgical Function | |---------|-------------|------------------------| | **Cobalt (Co)** | Balance | High-temperature matrix stability | | **Chromium (Cr)** | 20.0–24.0 | Oxidation and sulfidation resistance | | **Nickel (Ni)** | 20.0–24.0 | Austenitic structure stabilization | | **Tungsten (W)** | 13.0–15.0 | Solid-solution strengthening | | **Lanthanum (La)** | 0.03–0.12 | Oxide scale adhesion enhancement | | **Iron (Fe)** | ≤ 3.0 | Residual element | | **Manganese (Mn)** | ≤ 1.25 | Hot workability improvement | | **Silicon (Si)** | ≤ 0.20 | Residual element | | **Carbon (C)** | 0.05–0.15 | Carbide strengthening | | **Boron (B)** | ≤ 0.015 | Grain boundary reinforcement | --- #### **3. Physical Properties** | Property | Value | |----------|-------| | **Density** | 9.13 g/cm³ (0.330 lb/in³) | | **Melting Range** | 1330–1380°C (2426–2516°F) | | **Thermal Conductivity** | 10.1 W/m·K at 100°C | | **Mean CTE (20-100°C)** | 12.3 µm/m·°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 min (140 ksi min) - **Yield Strength (0.2% Offset)**: 485 MPa min (70 ksi min) - **Elongation**: 50% min - **Hardness**: 85–100 HRB **Elevated Temperature Performance:** - **Stress Rupture Strength**: 48 MPa at 980°C/100h - **Creep Strength**: 35 MPa at 1000°C/1000h - **Maximum Service Temperature**: 1150°C intermittent --- #### **5. Product Specifications** **Tube Size Range:** - **Outside Diameter**: 3 mm to 100 mm (0.125" to 4") - **Wall Thickness**: 0.5 mm to 10 mm (0.020" to 0.375") - **Length**: Standard 3-7 meters, custom lengths available **Manufacturing Processes:** - **Seamless Tube**: ASTM B622 for high-pressure applications - **Welded Tube**: ASTM B626 for general service - **Surface Finish**: Pickled, bright annealed, or polished **Tolerance Standards:** - **OD Tolerance**: ±0.1 mm for precision tubes - **Wall Tolerance**: ±10% standard, ±5% special - **Straightness**: 1.5 mm/m maximum --- #### **6. Applications** **Heat Exchanger Applications:** - High-temperature heat exchanger tubes - Waste heat recovery systems - Process heater tubes - Nuclear steam generator tubes **Aerospace & Defense:** - Jet engine bleed air systems - Hydraulic line conduits - Fuel system components - Environmental control systems **Industrial Processing:** - Thermocouple protection sleeves - Radiation pyrometer tubes - Furnace radiant tubes - Chemical process tubing **Power Generation:** - Superheater and reheater tubes - Boiler tubes for advanced cycles - Gas turbine transition pieces --- #### **7. International Standards** | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | R30188 | Material designation | | **ASTM** | B622 | Seamless Pipe and Tube | | **ASTM** | B626 | Welded Tube | | **ASME** | SB-622 | Boiler and Pressure Vessel Code | | **AMS** | 5772 | Sheet, Strip, and Plate | | **DIN** | 2.4684 | German standard designation | --- #### **8. Fabrication & Installation** **Tube Bending & Forming:** - **Minimum Bend Radius**: 2 × OD for thin walls - **Bending Temperature**: Cold bending preferred, hot bending at 1170°C - **Springback Allowance**: 10-15% typical **Joining Methods:** - **Welding**: GTAW with ERCoCr-A filler - **Tube Fittings**: Swage-type, compression, or brazed fittings - **Expansion Joints**: Suitable for tube-to-tubesheet joining **Heat Treatment:** - **Solution Annealing**: 1230°C (2250°F) + rapid cool - **Stress Relieving**: 870°C (1600°F) for 2 hours --- #### **9. Quality Assurance** **Standard Testing:** - Hydrostatic or pneumatic testing - Eddy current examination per ASTM E309 - Ultrasonic testing for wall thickness verification - Dimensional inspection per ASTM A450 **Special Testing Available:** - Flare testing for ductility verification - Flattening testing for weld quality - Grain size evaluation per ASTM E112 - Oxide scale adhesion testing --- #### **10. Technical Advantages** - **Superior oxidation resistance** compared to nickel-based alloys - **Excellent thermal fatigue resistance** for cyclic duty - **Good resistance to thermal shock** - **Maintains strength** at high temperatures - **Long service life** in aggressive environments - **Reliable performance** in temperature cycling applications --- **Contact Information:** For technical support, size availability, and application engineering for Udimet 188 Tube products, please contact our tubular products specialists for comprehensive assistance.

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 2239 gallon liquid totes Special package is available on request.