Do you need custom fasteners created with Columbium? Since our inception, Vegas Fastener Group has met every challenge of providing Quality, Timely, Cost-effective solutions for specialty fastener applications. Every product is built to your specifications, using your prints if necessary.
Below are the technical specifications of the Columbium Bar Stock we have available to meet your needs.
Niobium, Nb (Columbium, Cb); Cold-Worked
Subcategory: Metal; Niobium Alloy; Nonferrous Metal; Pure Metallic Element
| Component | Wt. % |
| Nb | 100 |
Material Notes: Cold-worked applies only to tensile and/or hardness values; other property values are typical of the element. The name niobium is used by chemists but the element is generally called columbium by American metallurgists. Fabrication: good formability, work hardens slowly, cannot be soldered. Joining requires adhesives, rivets, nuts and bolts, or capacitive discharge welding. Applications: used in aerospace applications (i.e. rocket boosters), sodium vapor lamps, and superconductors.
| Physical Properties | Metric | English | Comments |
| Density | 8.6 g/cc | 0.311 lb/in³ | |
| Mechanical Properties | |||
| Hardness, Brinell | 126 | 126 | Converted from Vickers for 3000 kg load/10 mm ball Brinell test. |
| Hardness, Rockwell A | 45 | 45 | Converted from Vickers. |
| Hardness, Rockwell B | 71 | 71 | Converted from Vickers. |
| Hardness, Vickers | 130 | 130 | |
| Tensile Strength, Ultimate | 600 MPa | 87000 psi | |
| Modulus of Elasticity | 103 GPa | 14900 ksi | |
| Poisson’s Ratio | 0.38 | 0.38 | |
| Shear Modulus | 37.5 GPa | 5440 ksi | |
| Electrical Properties | |||
| Electrical Resistivity | 1.51e-005 ohm-cm | 1.51e-005 ohm-cm | |
| Magnetic Susceptibility | 2.28e-006 | 2.28e-006 | cgs/g |
| Critical Magnetic Field Strength, Oersted | 2010 – 2110 | 2010 – 2110 | |
| Critical Superconducting Temperature | 9.23 – 9.27 K | 9.23 – 9.27 K | |
| Thermal Properties | |||
| Heat of Fusion | 290 J/g | 125 BTU/lb | |
| CTE, linear 20°C | 7.1 µm/m-°C | 3.94 µin/in-°F | over the range 20-100ºC |
| CTE, linear 250°C | 7.38 µm/m-°C | 4.1 µin/in-°F | at 300°C |
| CTE, linear 500°C | 7.61 µm/m-°C | 4.23 µin/in-°F | |
| CTE, linear 1000°C | 8.52 µm/m-°C | 4.73 µin/in-°F | |
| Heat Capacity | 0.272 J/g-°C | 0.065 BTU/lb-°F | |
| Thermal Conductivity | 52.3 W/m-K | 363 BTU-in/hr-ft²-°F | |
| Melting Point | 2468 °C | 4470 °F | |
| Optical Properties | |||
| Emissivity (0-1) | 0.39 | 0.39 | 2000°C |
| Emissivity (0-1) | 0.78 | 0.78 | 1350°C |
References are available for this material.
