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

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

**Technical Data Sheet: Cobalt Alloy 6B / Stellite 6B Rod (UNS R30016)** **1.0 Product Overview** Cobalt Alloy 6B Rod, commercially known as Stellite 6B Rod (UNS R30016), is a cobalt-chromium-tungsten superalloy supplied in rod form specifically for manufacturing wear-resistant components and welding applications. This product form combines the exceptional wear resistance, corrosion resistance, and high-temperature hardness characteristic of the Stellite 6B alloy with the versatility and machinability of rod stock, making it ideal for producing custom wear parts and welding electrodes. **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 carefully balanced composition creates hard chromium carbides within a tough cobalt-chromium matrix, providing optimal wear resistance.* **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 | | Electrical Resistivity | 0.87 μΩ·m | 33.8 μΩ·in | 21°C | **4.0 Mechanical Properties** **4.1 As-Supplied Condition (Cast Rod)** - 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% - Compressive Strength: 1750-2050 MPa (255-300 ksi) **4.2 Elevated Temperature Performance** - Maintains 85% of room temperature hardness at 500°C (930°F) - Maintains 70% of room temperature hardness at 650°C (1200°F) - Excellent thermal fatigue resistance - Low friction coefficient at elevated temperatures **5.0 Product Specifications** **5.1 Standard Rod Sizes** - **Diameter Range:** 3.0 mm to 150 mm (1/8" to 6") - **Length:** Standard 300-400 mm (12-16") or cut to length - **Tolerance:** h11 for diameters up to 50 mm - **Straightness:** 1 mm per 300 mm maximum **5.2 Available Conditions** - As-cast (centrifugally or statically cast) - Rough machined - Ground finish - Heat treated (stress relieved) **6.0 Manufacturing & Processing** **6.1 Machining Recommendations** - Use carbide or ceramic cutting tools - Maintain positive rake angles - Use rigid tooling and setups - Employ low speeds and heavy feeds - Use copious coolant for grinding operations **6.2 Welding Applications** - Excellent for manual and automatic welding - Suitable for OAW, GTAW, GMAW processes - Used as bare rod for oxy-acetylene welding - Can be manufactured into coated electrodes **7.0 Heat Treatment** **7.1 Standard Treatments** - Stress Relieving: 650-750°C (1200-1380°F) for 1-2 hours - Solution Treatment: 1190-1230°C (2175-2245°F) - rarely used - Slow cooling after stress relieving recommended **7.2 Special Considerations** - Avoid rapid heating and cooling - Maintain uniform temperature during heat treatment - Use protective atmosphere for high temperature treatments **8.0 Product Applications** **8.1 Component Manufacturing** - Valve stems and seats - Pump shafts and sleeves - Cutting tools and knives - Bearing surfaces - Wear plates and inserts **8.2 Welding & Hardfacing** - Manual hardfacing applications - Build-up of worn components - Manufacturing of welding electrodes - Repair of critical wear surfaces **8.3 Specific Industries** - **Valve Manufacturing:** Gate valve components, ball valve seats - **Pump Industry:** Shaft sleeves, wear rings, impellers - **Steel Industry:** Guide rolls, forming tools - **Mining:** Cutting tools, wear parts **9.0 International Standards & Specifications** | Standard Organization | Standard Number | Description | |----------------------|-----------------|-------------| | ASTM International | ASTM F1376 | Cobalt-Chromium Alloy Rod for Welding | | AMS | AMS 5385 | Cobalt Alloy Castings (Rod derived from) | | AWS | A5.13 | Cobalt Alloy Welding Electrodes and Rods | | UNS | R30016 | Unified Numbering System | | DIN | 2.4778 | German Material Number | **10.0 Fabrication Characteristics** **10.1 Machinability** - Poor machinability rating (10% of 1112 steel) - Grinding is preferred finishing method - EDM machining possible - Requires rigid setups and sharp tools **10.2 Forming** - Not suitable for cold or hot forming - Must be used in as-cast or machined condition - Can be joined by welding or brazing **11.0 Quality Assurance** **11.1 Testing Requirements** - Chemical composition verification - Hardness testing (HRC scale) - Visual and dimensional inspection - Surface quality assessment - Microstructure examination available **11.2 Certification** - Mill Test Certificates per EN 10204 3.1 - Full traceability to heat lot - Chemical analysis report - Hardness test reports **12.0 Storage & Handling** **12.1 Storage Conditions** - Store in dry, indoor environment - Protect from mechanical damage - Keep separated by size and heat lot - Avoid contact with corrosive substances **12.2 Handling Recommendations** - Use clean gloves when handling - Protect finished surfaces from damage - Support long rods properly to prevent bending - Identify and segregate by material grade Cobalt Alloy 6B Rod (Stellite 6B) provides manufacturers with a versatile raw material for producing highly wear-resistant components and welding electrodes. Its exceptional combination of wear resistance, corrosion resistance, and high-temperature performance makes it invaluable for applications where conventional materials fail prematurely. The rod form offers flexibility in manufacturing while maintaining the superior properties that have made Stellite alloys the industry standard for severe wear applications.

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 2340 gallon liquid totes Special package is available on request.