Alloy 188,Udimet 188 Rod,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 Rod / UNS R30188** **Cobalt-Chromium-Nickel-Tungsten Superalloy Rod Product** --- #### **1. Product Overview** **Alloy 188 Rod** (commercially known as **Udimet 188 Rod** or **Haynes 188 Rod**, UNS R30188) is a premium cobalt-based superalloy supplied in rod form for machining high-temperature components. This product combines exceptional elevated temperature strength with outstanding environmental resistance, making it ideal for manufacturing critical parts operating up to **1100°C (2012°F)**. The rod form offers excellent machinability and consistent mechanical properties throughout the cross-section. --- #### **2. Chemical Composition (Weight %)** | Element | Content (%) | Metallurgical Function | |---------|-------------|------------------------| | **Cobalt (Co)** | Balance | Matrix for high-temperature stability | | **Chromium (Cr)** | 20.0–24.0 | Oxidation/sulfidation resistance | | **Nickel (Ni)** | 20.0–24.0 | Austenite stabilization | | **Tungsten (W)** | 13.0–15.0 | Solid-solution strengthening | | **Lanthanum (La)** | 0.03–0.12 | Oxide scale adhesion | | **Iron (Fe)** | ≤ 3.0 | Residual element | | **Manganese (Mn)** | ≤ 1.25 | Hot workability | | **Silicon (Si)** | ≤ 0.20 | Residual element | | **Carbon (C)** | 0.05–0.15 | Carbide strengthening | | **Boron (B)** | ≤ 0.015 | Grain boundary strength | --- #### **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** | 12.3 µm/m·°C (20–100°C) | | **Electrical Resistivity** | 1.02 µΩ·m at 21°C | | **Magnetic Permeability** | <1.01 | --- #### **4. Mechanical Properties** **Room Temperature (Annealed Condition):** - **Tensile Strength**: 965–1200 MPa (140–174 ksi) - **Yield Strength (0.2% Offset)**: 485–690 MPa (70–100 ksi) - **Elongation**: 45–60% - **Reduction of Area**: 55–70% - **Hardness**: 85–100 HRB **Elevated Temperature Capability:** - **Stress Rupture Strength**: 48 MPa (7 ksi) at 980°C/100h - **Creep Strength**: 35 MPa (5 ksi) at 1000°C/1000h - **Maximum Service Temperature**: 1150°C (2102°F) intermittent --- #### **5. Product Specifications** **Available Forms & Sizes:** - **Diameter Range**: 3 mm to 300 mm (0.125" to 12") - **Length**: Random lengths 3-6 meters, cut lengths per order - **Tolerances**: Standard h8/h9, special tolerances available - **Surface Finish**: Black, ground, polished, or peeled **Standard Conditions:** - **Solution Annealed**: Optimal for machining - **Stress Relieved**: For improved stability - **Centerless Ground**: For precision applications --- #### **6. Applications** **Machined Components for Aerospace:** - Turbine seals and shrouds - Combustion chamber supports - Afterburner components - Exhaust system fasteners **Industrial Components:** - Heat treatment fixture parts - Furnace roll journals - Nuclear reactor components - Chemical processing hardware **Fastener Manufacturing:** - High-temperature bolts and studs - Engine mounting components - Special threaded fasteners --- #### **7. International Standards** | Standard Type | Standard Number | Specification | |---------------|-----------------|---------------| | **UNS** | R30188 | Material designation | | **ASTM** | B572 | Rod and Bar | | **AMS** | 5803 | Bar, Forgings, and Rings | | **ASME** | SB-572 | Nuclear applications | | **EN/DIN** | 2.4684 | European designation | | **ISO** | 9723 | Aerospace forgings | --- #### **8. Machining & Fabrication** **Machining Guidelines:** - **Tools**: Carbide or high-speed steel with positive rake - **Speeds**: 10-20 m/min (30-65 SFM) for roughing - **Feeds**: 0.1-0.2 mm/rev (0.004-0.008 IPR) - **Coolant**: Heavy-duty soluble oil recommended **Heat Treatment:** - **Solution Anneal**: 1230°C (2250°F) + rapid cool - **Stress Relief**: 870°C (1600°F) for 2 hours + AC **Welding:** - Excellent weldability using GTAW process - Use AWS A5.13 ERCoCr-A or matching filler - Pre-heat not required, post-weld anneal recommended --- #### **9. Quality Assurance** **Certification:** - Mill Test Certificate EN 10204 3.1/3.2 - Chemical and mechanical test reports - Ultrasonic testing available - Origin and material traceability **Testing Capabilities:** - Tensile testing at room and elevated temperatures - Stress rupture testing - Microstructural examination - Non-destructive testing --- #### **10. Why Choose Udimet 188 Rod?** - **Consistent quality** throughout rod cross-section - **Excellent machinability** compared to other superalloys - **Superior high-temperature strength** maintenance - **Available in various sizes and conditions** - **Proven performance** in extreme environments --- **Contact us** for technical support, pricing, and delivery information for Udimet 188 Rod products.

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 2236 gallon liquid totes Special package is available on request.