Alloy 188,Haynes 188 ,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 / Haynes 188 (UNS R30188) **Cobalt-Nickel-Chromium-Tungsten Superalloy for Extreme Temperature Applications** --- #### 1. Overview **Alloy 188** (commercially known as **Haynes 188**, **UNS R30188**) is a solid-solution strengthened cobalt-nickel-chromium-tungsten superalloy distinguished by its exceptional high-temperature strength, outstanding oxidation resistance, and excellent structural stability. The addition of lanthanum significantly enhances its oxidation resistance, making it superior to many conventional superalloys in extreme environments. This alloy maintains excellent fabricability and weldability while providing superior performance in oxidizing, sulfidizing, and carburizing atmospheres up to 1200°C (2190°F). --- #### 2. Chemical Composition (Typical Weight %) | Element | Content (%) | Role in the Alloy | |---------|-------------|-------------------| | **Cobalt (Co)** | Balance | Base matrix providing solid-solution strength | | **Nickel (Ni)** | 20.0-24.0 | Stabilizes austenitic structure, improves ductility | | **Chromium (Cr)** | 20.0-24.0 | Exceptional oxidation and corrosion resistance | | **Tungsten (W)** | 13.0-16.0 | Primary solid-solution strengthener | | **Iron (Fe)** | 3.0 max | Impurity control | | **Lanthanum (La)** | 0.03-0.15 | Dramatically improves oxidation resistance | | **Manganese (Mn)** | 1.0-2.0 | Enhances hot workability | | **Silicon (Si)** | 0.20-0.50 | Improves oxidation resistance | | **Carbon (C)** | 0.05-0.15 | Carbide formation for strength | | **Boron (B)** | 0.005-0.025 | Improves creep properties | --- #### 3. Physical Properties | Property | Value | |----------|-------| | **Density** | 9.13 g/cm³ (0.330 lb/in³) | | **Melting Range** | 1325-1370°C (2415-2500°F) | | **Thermal Conductivity** | 10.3 W/m·K (at 20°C) | | **Coefficient of Thermal Expansion** | 12.2 μm/m·K (20-100°C)
16.2 μm/m·K (20-1000°C) | | **Specific Heat Capacity** | 430 J/kg·K (at 20°C) | | **Electrical Resistivity** | 0.98 μΩ·m | | **Magnetic Permeability** | Essentially non-magnetic | | **Modulus of Elasticity** | 238 GPa (34.5 x 10^6 psi) | --- #### 4. Mechanical Properties **Room Temperature Properties (Annealed Condition):** - **Tensile Strength**: 965-1240 MPa (140-180 ksi) - **0.2% Yield Strength**: 460-620 MPa (67-90 ksi) - **Elongation**: 50-65% - **Reduction of Area**: 55-70% - **Hardness**: Rockwell B 90-100 **Elevated Temperature Properties:** - **Stress Rupture Strength (980°C)**: 48 MPa for 100 hours - **Creep Strength (870°C)**: 83 MPa for 1% creep in 10,000 hours - **Maximum Service Temperature**: 1200°C (2190°F) in oxidizing atmospheres - **Oxidation Resistance**: Excellent cyclic oxidation resistance --- #### 5. International Standards & Specifications | Standard Organization | Standard Designation | Description | |----------------------|----------------------|-------------| | **ASTM International** | **ASTM B435** | Plate, sheet, and strip | | **Aerospace (SAE/AMS)** | **AMS 5608** | Sheet, strip, and plate | | **Aerospace (SAE/AMS)** | **AMS 5772** | Bar, forgings, and rings | | **Unified Numbering System** | **UNS R30188** | All product forms | | **ASME** | **SB-574** | Seamless and welded pipe and tube | | **European (EN)** | **2.4683** | Material number | --- #### 6. Product Applications **Aerospace & Defense:** - Gas turbine combustor components - Afterburner components - Turbine seals and shrouds - Exhaust system components - Rocket engine parts **Power Generation:** - Gas turbine transition ducts - Combustor liners - Heat exchanger components - Steam turbine parts - Nuclear reactor components **Industrial Applications:** - Heat treatment fixtures - Furnace components - Chemical processing equipment - Incinerator components - Petrochemical furnace parts **Medical & Specialty:** - Medical implants (limited applications) - High-temperature tooling - Semiconductor processing equipment --- #### 7. Fabrication Characteristics **Machining:** - Machinability rating: 30% of B1112 steel - Use positive rake carbide tools - Moderate speeds with consistent feed - Adequate cooling required **Welding:** - Excellent weldability using TIG, MIG processes - Use Haynes 188 or L605 filler wire - Preheating generally not required - Post-weld heat treatment optional **Forming:** - Good hot and cold forming characteristics - Hot working temperature: 1150-1200°C - Cold forming requires intermediate annealing --- #### 8. Corrosion Resistance **Excellent Resistance To:** - Oxidation up to 1200°C - Sulfidation - Hot corrosion - Carburization - Nitridation **Good Resistance To:** - Sea water - Mild acids - Alkaline solutions **Limited Resistance To:** - Reducing acids - Hydrochloric acid - Sulfuric acid --- #### 9. Quality Assurance & Certification **Testing & Certification:** - Chemical analysis certification - Mechanical properties testing - Non-destructive testing available - Full traceability maintained - Certificates of Compliance provided **Quality Standards:** - NADCAP accreditation available - AS9100 quality system - Customer-specific requirements - RoHS and REACH compliant --- #### 10. Advantages Over Similar Alloys - **Superior oxidation resistance** due to lanthanum addition - **Better thermal stability** than nickel-based superalloys - **Excellent fatigue strength** at elevated temperatures - **Good fabricability** and weldability - **Outstanding performance** in thermal cycling conditions --- **Note**: This technical data sheet provides typical values and characteristics. Specific properties may vary depending on product form, size, and manufacturing process. For critical applications, always consult the official specifications and the material producer's latest data. Haynes 188 is a registered trademark of Haynes International Inc.

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 2222 gallon liquid totes Special package is available on request.