Cobalt Alloy 6b,Stellite 6b ,UNS R30016,E FORU

British Specs:，American Specs: AMS 5894 Bar, Sheet, Plate，German Specs:

**Technical Data Sheet: Cobalt Alloy 6B / Stellite 6B (UNS R30016)** **1.0 Product Overview** Cobalt Alloy 6B, commercially known as Stellite 6B, is a cobalt-chromium-tungsten superalloy belonging to the family of cobalt-based hardfacing alloys. Designated as **UNS R30016**, this alloy is renowned for its exceptional wear resistance, excellent corrosion resistance, and ability to maintain hardness at elevated temperatures. It is particularly valued for its outstanding galling and metal-to-metal wear resistance, making it suitable for severe service conditions where other materials fail. **2.0 Chemical Composition** | Element | Content (%) | Primary Function | |---------|-------------|------------------| | Co | Balance | Matrix Element, provides inherent wear resistance | | Cr | 27.0-32.0 | Corrosion & Oxidation Resistance, forms carbides | | W | 3.0-5.0 | Solid Solution Strengthener, enhances hot hardness | | C | 0.9-1.4 | Primary carbide former for wear resistance | | Si | 1.0 max | Deoxidizer, improves fluidity | | Fe | 3.0 max | - | | Ni | 3.0 max | Austenite stabilizer | | Mn | 1.0 max | Deoxidizer | | Mo | 1.0 max | Secondary strengthener | *Note: The high carbon content leads to formation of hard chromium carbides within the tough cobalt-chromium matrix.* **3.0 Physical Properties** | Property | Metric Value | Imperial Value | Condition | |----------|--------------|----------------|-----------| | Density | 8.53 g/cm³ | 0.308 lb/in³ | Room Temperature | | Melting Range | 1290-1395°C | 2350-2540°F | - | | Thermal Conductivity | 14.9 W/m·K | 103.0 Btu·in/(hr·ft²·°F) | 21°C | | Mean Coefficient of Thermal Expansion | 14.2 × 10⁻⁶/°C | 7.9 × 10⁻⁶/°F | 20-540°C | | Modulus of Elasticity | 211 GPa | 30.6 × 10⁶ psi | Room Temperature | **4.0 Mechanical Properties** **4.1 Room Temperature Properties (Cast Condition)** - Hardness: 37-45 HRC - Ultimate Tensile Strength: 690-895 MPa (100-130 ksi) - Yield Strength (0.2% Offset): 480-620 MPa (70-90 ksi) - Elongation: 1-2% **4.2 Elevated Temperature Properties** - Maintains hardness up to 600°C (1110°F) - Excellent hot hardness characteristics - Good thermal shock resistance - Low coefficient of friction at elevated temperatures **5.0 Manufacturing Characteristics** **5.1 Forming & Machining** - Not recommended for cold or hot forming - Must be used in cast or deposited form - Grinding is the preferred machining method - Can be machined with carbide tools in annealed condition **5.2 Weldability** - Excellent weld deposition characteristics - Suitable for oxy-acetylene, GTAW, GMAW, PTA processes - Low dilution requirements - Pre-heat (300-400°C) and post-heat (600°C) recommended **6.0 Product Applications** **6.1 Valve Components** - Valve seats and trim - Gate valve wedges - Ball valve seats - Control valve components **6.2 Pump Components** - Pump shafts - Sleeve bearings - Wear rings - Impeller seals **6.3 Industrial Tools** - Cutting knives - Shearing blades - Extrusion screws - Wear plates **6.4 Aerospace & Defense** - Gas turbine engine components - Bearing surfaces - Actuator components **7.0 Available Product Forms** **7.1 Cast Products** - Centrifugal castings - Static castings - Investment cast components - Finished machined parts **7.2 Welding Products** - Cast rods and electrodes - Powder for PTA and laser cladding - MIG and TIG wires **8.0 International Standards & Specifications** | Standard Organization | Standard Number | Description | |----------------------|-----------------|-------------| | ASTM International | ASTM F75 | Cobalt-Chromium Alloy Castings | | AMS | AMS 5385 | Cobalt Alloy Castings | | AWS | A5.13 | Cobalt Alloy Welding Electrodes | | UNS | R30016 | Unified Numbering System | | DIN | 2.4778 | German Material Number | **9.0 Heat Treatment** - Stress Relieving: 650-750°C (1200-1380°F) - Solution Treatment: 1190-1230°C (2175-2245°F) - Aging: Not typically required - Heat treatment must be carefully controlled to prevent cracking **10.0 Corrosion & Wear Performance** **10.1 Corrosion Resistance** - Excellent resistance to sulfuric and phosphoric acids - Good resistance to seawater and marine environments - Moderate resistance to hydrochloric acid - Outstanding cavitation erosion resistance **10.2 Wear Resistance** - Exceptional metal-to-metal wear resistance - Excellent galling resistance - Good erosion resistance - Superior abrasion resistance compared to stainless steels **11.0 Quality Assurance** - Chemical composition verification - Hardness testing - Dimensional inspection - Non-destructive testing (PT, RT, UT) - Microstructure examination **12.0 Design Considerations** - Brittle material - avoid sharp corners - Minimum section thickness: 3 mm (0.125") - Allow for grinding/machining stock - Consider thermal expansion in assembly designs Cobalt Alloy 6B (Stellite 6B) remains the industry benchmark for severe wear applications requiring combination of wear resistance, corrosion resistance, and elevated temperature performance. Its unique properties make it indispensable for critical components in chemical processing, power generation, oil and gas, and aerospace industries where reliability and long service life are paramount.

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 2339 gallon liquid totes Special package is available on request.