Alloy 6 (UNS R30006) is the most widely used cobalt-based alloy, offering an exceptional balance of wear resistance, corrosion protection, and high-temperature capability. With a nominal composition of 28% chromium, 5% tungsten, and 1.2% carbon, it maintains significant hardness up to 500°C (930°F) while providing excellent resistance to galling, abrasion, cavitation erosion, and thermal fatigue. This versatile alloy is the preferred choice for valve trim, pump components, and hardfacing applications .
1. Product Specifications & Physical DataZYTC Alloy supplies Alloy 6 (UNS R30006) in various forms for critical wear and corrosion applications requiring verified properties. Available Forms: Hardfacing rods, powder, wire, castings, preforms, and machined components . Specifications: UNS R30006, AWS A5.21 (ERCoCr-B), AMS 5387, GE B50A392 .
| Chemical Composition (Weight %) | Alloy 6 Specification |
|---|
| Cobalt (Co) | Balance | | Chromium (Cr) | 27.0 - 32.0 | | Tungsten (W) | 4.0 - 6.0 | | Carbon (C) | 1.0 - 1.4 | | Nickel (Ni) | 3.0 max. | | Iron (Fe) | 3.0 max. | | Silicon (Si) | 1.0 max. | | Manganese (Mn) | 1.0 max. | | Molybdenum (Mo) | 1.0 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.79 g/cm³ | 0.318 lb/in³ | | Melting Range | 1265 - 1350°C | 2310 - 2460°F | | Hardness | 45 - 50 HRC | 410 - 480 HV | | Thermal Conductivity | 12.7 W/m·K | 88 BTU·in/hr·ft²·°F | | Modulus of Elasticity | 206 - 210 GPa | 30 - 30.5 × 10⁶ psi |
| Mechanical Properties | Metric | Imperial |
|---|
| Tensile Strength | 700 - 950 MPa | 101 - 138 ksi | | Yield Strength | 450 - 600 MPa | 65 - 87 ksi | | Elongation | 5 - 10% | 5 - 10% | | Creep Strength | Strong at 870°C | Strong at 1600°F |
2. Fabrication & Material ComparisonAlloy 6 (UNS R30006) offers versatility in application methods while maintaining consistent properties. Hardfacing Methods: Ideally suited for PTA welding, laser cladding, thermal spraying, spray and fuse, and oxy-acetylene deposition . Machining: Can be machined with carbide tooling; requires rigid setups, positive rake angles, and adequate coolant. Best finished by grinding . Castability: Good fluidity for complex casting geometries; sound metallurgical structure . Weldability: Excellent for overlay applications; minimal dilution issues with proper technique . Material Comparison: vs. Stellite 1: Lower hardness (45-50 vs. 50-58 HRC) but better toughness and impact resistance . vs. Stellite 12: Similar properties; 6 offers better corrosion resistance; 12 has higher hardness . vs. Stellite 21: 6 has higher wear resistance; 21 offers better impact and corrosion resistance .
3. ApplicationsValve Components: Seats, gates, trim, stems, discs for oil & gas, power generation, chemical processing Pump & Fluid Handling: Shafts, sleeves, bearings, impellers, wear rings Aerospace & Automotive: Turbine blades, exhaust valves, engine components, wear pads Industrial Tooling: Cutting edges, dies, extrusion screws, hot shear blades Nuclear Industry: Control rod components, valve trim requiring radiation resistance
Contact ZYTC Alloy for certified Alloy 6 (UNS R30006) materials with complete traceability, technical datasheets, and competitive pricing on standard sizes or custom-fabricated components. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
