Cobalt Alloy 6b,Stellite 6b Bar(Round bar, Flat bar),UNS R30016,E FORU

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

**Technical Data Sheet: Cobalt Alloy 6B / Stellite 6B Bar (Round Bar & Flat Bar) UNS R30016** **1.0 Product Overview** Cobalt Alloy 6B Bar, commercially known as Stellite 6B Bar (UNS R30016), is a cobalt-chromium-tungsten superalloy supplied in both round bar and flat bar configurations. This product form provides exceptional wear resistance, excellent corrosion resistance, and maintained hardness at elevated temperatures, making it ideal for machining into various wear-resistant components used in severe service conditions across multiple industries. **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 | **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 | | Specific Heat | 420 J/kg·K | 0.10 Btu/lb·°F | 21°C | **4.0 Mechanical Properties** **4.1 Typical Room Temperature Properties (As-Cast)** - 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% - Reduction in Area: 2-4% **4.2 Special Bar Properties** - Excellent compressive strength: 1750-2050 MPa (255-300 ksi) - Good fatigue resistance under compressive loads - Maintains mechanical properties up to 600°C (1110°F) - Superior resistance to thermal shock **5.0 Product Specifications** **5.1 Round Bar Specifications** - **Diameter Range:** 6 mm to 300 mm (1/4" to 12") - **Length:** 100 mm to 3000 mm (4" to 120") - **Tolerance:** ±0.1 mm for diameters up to 25 mm - **Straightness:** 0.5 mm per 300 mm maximum **5.2 Flat Bar Specifications** - **Thickness:** 5 mm to 100 mm (0.2" to 4") - **Width:** 20 mm to 300 mm (0.8" to 12") - **Length:** 100 mm to 2000 mm (4" to 80") - **Flatness:** 0.1 mm per 100 mm maximum **6.0 Manufacturing Processes** **6.1 Production Methods** - Investment casting for complex shapes - Centrifugal casting for round bars - Grinding and machining to final dimensions - Quality inspection at each production stage **6.2 Surface Conditions** - As-cast surface - Rough machined - Ground finish - Polished (special order) **7.0 Heat Treatment** **7.1 Standard Heat Treatments** - Stress Relieving: 650-750°C (1200-1380°F) for 1-2 hours - Solution Annealing: 1190-1230°C (2175-2245°F) - optional - Slow furnace cooling recommended **7.2 Processing Considerations** - Avoid rapid temperature changes - Use protective atmosphere above 400°C - Uniform heating and cooling essential - Stress relieve after heavy machining **8.0 Product Applications** **8.1 Round Bar Applications** - Valve stems and guides - Pump shafts and sleeves - Cutting tool blanks - Bearing journals - Wear-resistant pins and bushings **8.2 Flat Bar Applications** - Wear plates and liners - Guide rails and ways - Cutting blades and knives - Seat rings and faces - Machinery components **8.3 Industry Specific Uses** - **Chemical Processing:** Mixer shafts, valve components - **Oil & Gas:** Wellhead components, valve trim - **Power Generation:** Turbine components, wear parts - **Steel Production:** Guide rolls, forming tools - **Mining:** Crusher parts, wear components **9.0 International Standards & Specifications** | Standard Organization | Standard Number | Description | |----------------------|-----------------|-------------| | ASTM International | ASTM F1376 | Cobalt-Chromium Alloy Bar | | AMS | AMS 5385 | Cobalt Alloy Castings | | AWS | A5.13 | Cobalt Alloy Welding Electrodes | | UNS | R30016 | Unified Numbering System | | DIN | 2.4778 | German Material Number | **10.0 Machining & Fabrication** **10.1 Machining Guidelines** - Use carbide or ceramic cutting tools - Maintain positive rake angles (5-10°) - Recommended cutting speed: 10-20 m/min - Use heavy feeds and moderate speeds - Copious coolant required for grinding **10.2 Welding Characteristics** - Excellent weldability for hardfacing - Low dilution with base metals - Suitable for repair and buildup - Pre-heat to 300-400°C recommended **11.0 Quality Assurance** **11.1 Testing & Inspection** - Chemical composition verification - Hardness testing (HRC scale) - Ultrasonic testing for internal defects - Dimensional accuracy verification - Surface quality assessment **11.2 Certification** - Mill Test Certificates per EN 10204 3.1 - Full material traceability - Chemical analysis reports - Mechanical test certificates - Non-destructive testing reports **12.0 Design Considerations** **12.1 Engineering Guidelines** - Minimum recommended wall thickness: 5 mm - Avoid sharp corners and stress concentrators - Allow for grinding stock in tolerances - Consider thermal expansion in assembly **12.2 Performance Characteristics** - Excellent metal-to-metal wear resistance - Superior galling resistance - Good oxidation resistance up to 980°C - Outstanding cavitation erosion resistance Cobalt Alloy 6B Bar (Stellite 6B) in both round and flat configurations offers manufacturers a versatile raw material for producing highly wear-resistant components. Its unique combination of properties makes it particularly valuable for applications involving metal-to-metal wear, corrosion, and elevated temperature service where conventional materials would fail prematurely. The availability in both round and flat bar forms provides design flexibility while maintaining the exceptional performance characteristics that define the Stellite alloy family.

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 2341 gallon liquid totes Special package is available on request.