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Columbium Material Property Data Sheet

Do you need custom fasteners created with Columbium? Since our inception, Vegas Fastener Manufacturing 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. %

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 PropertiesMetricEnglishComments
Density8.6 g/cc0.311 lb/in 

Mechanical Properties
Hardness, Brinell126126 Converted from Vickers for 3000 kg load/10 mm ball Brinell test.
Hardness, Rockwell A4545 Converted from Vickers.
Hardness, Rockwell B7171 Converted from Vickers.
Hardness, Vickers130130 
Tensile Strength, Ultimate600 MPa87000 psi 
Modulus of Elasticity103 GPa14900 ksi 
Poisson's Ratio0.380.38 
Shear Modulus37.5 GPa5440 ksi 

Electrical Properties
Electrical Resistivity1.51e-005 ohm-cm1.51e-005 ohm-cm 
Magnetic Susceptibility2.28e-0062.28e-006 cgs/g
Critical Magnetic Field Strength, Oersted2010 - 21102010 - 2110 
Critical Superconducting Temperature9.23 - 9.27 K9.23 - 9.27 K 

Thermal Properties
Heat of Fusion290 J/g125 BTU/lb 
CTE, linear 20C7.1 m/m-C3.94 in/in-F over the range 20-100C
CTE, linear 250C7.38 m/m-C4.1 in/in-F at 300C
CTE, linear 500C7.61 m/m-C4.23 in/in-F 
CTE, linear 1000C8.52 m/m-C4.73 in/in-F 
Heat Capacity0.272 J/g-C0.065 BTU/lb-F 
Thermal Conductivity52.3 W/m-K363 BTU-in/hr-ft-F 
Melting Point2468 C4470 F 

Optical Properties
Emissivity (0-1)0.390.39 2000C
Emissivity (0-1)0.780.78 1350C

References are available for this material.


This information is provided by MatWeb.com, The Online Materials Database and is reprinted with their permission.

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