Alloy 188,Udimet 188 Bar(Round bar, Flat bar),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 Bar / UNS R30188** **Cobalt-Chromium-Nickel-Tungsten Superalloy Bar Products** --- #### **1. Product Overview** **Alloy 188 Bar** (commercially known as **Udimet 188 Bar** or **Haynes 188 Bar**, UNS R30188) is supplied in both **round bar** and **flat bar** configurations, providing versatile manufacturing solutions for high-temperature applications. These products maintain the alloy's exceptional high-temperature strength, oxidation resistance, and thermal stability while offering excellent machinability and fabricability for critical components operating up to **1100°C (2012°F)**. --- #### **2. Chemical Composition (Weight %)** | Element | Content (%) | Metallurgical Function | |---------|-------------|------------------------| | **Cobalt (Co)** | Balance | High-temperature matrix stability | | **Chromium (Cr)** | 20.0–24.0 | Oxidation/sulfidation protection | | **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 (Solution Annealed):** - **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 - **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** **Round Bar:** - **Diameter Range**: 5 mm to 300 mm (0.187" to 12") - **Tolerance**: h8/h9 standard, special tolerances available - **Surface Finish**: Hot-rolled, turned, ground, or polished - **Straightness**: Standard commercial, precision straightness available **Flat Bar:** - **Thickness**: 5 mm to 100 mm (0.187" to 4") - **Width**: 20 mm to 300 mm (0.75" to 12") - **Tolerance**: ±1% on thickness, ±2% on width - **Edge Condition**: As-rolled, milled, or machined edges --- #### **6. Applications** **Round Bar Applications:** - Machined turbine seals and rings - Engine mounting components - High-temperature fasteners and bolts - Nuclear reactor control rod guides - Heat treatment fixture components **Flat Bar Applications:** - Furnace rail systems and supports - Heat exchanger structural members - Combustion chamber brackets - Process industry support frames - Aerospace structural components --- #### **7. International Standards** | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | R30188 | Material designation | | **ASTM** | B572 | Rod and Bar Specification | | **AMS** | 5803 | Bar, Forgings, and Rings | | **ASME** | SB-572 | Pressure Component Applications | | **EN/DIN** | 2.4684 | European material number | | **ISO** | 9723 | Aerospace applications | --- #### **8. Machining & Fabrication** **Machining Characteristics:** - **Machinability Rating**: 25% (compared to 1112 steel) - **Tool Materials**: Carbide recommended for production runs - **Cutting Speeds**: 10-15 m/min for roughing, 15-20 m/min for finishing - **Feed Rates**: 0.1-0.3 mm/rev depending on operation - **Coolant**: Required for all heavy machining operations **Forming & Welding:** - **Hot Working**: 1170-1230°C (2140-2250°F) - **Cold Working**: Good in annealed condition with intermediate annealing - **Welding Processes**: GTAW, GMAW, SMAW with matching filler - **Post-Weld Heat Treatment**: Solution anneal at 1230°C recommended --- #### **9. Quality Assurance** **Standard Testing:** - Chemical analysis by optical emission spectroscopy - Tensile testing at room temperature - Hardness testing (Rockwell B scale) - Macro-etch testing for soundness **Additional Testing Available:** - Ultrasonic examination per ASTM A388 - Elevated temperature tensile testing - Stress rupture testing - Microstructural evaluation per ASTM E112 --- #### **10. Advantages of Udimet 188 Bar** - **Superior high-temperature strength** maintenance - **Excellent oxidation resistance** in air and combustion atmospheres - **Good fabricability** for complex component manufacturing - **Consistent properties** across all product sizes - **Proven reliability** in critical aerospace and industrial applications --- **Contact Information:** For technical specifications, pricing, and delivery schedules for Udimet 188 Round Bar and Flat Bar products, please contact our technical sales team for immediate 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 2237 gallon liquid totes Special package is available on request.