Strip, Coil, Foil, Wire, ASTM B393 

NIOB1 (Type 1 Reactor Grade Unalloyed) 
NIOB2 (Type 2 Commercial Grade Unalloyed)


Type 1 and Type 2:  

Used in jewelry, super-abrasives, thin film deposition (glass), high-energy physics, springs and superconducting magnets for aerospace, consumer electronics, medical and superconducting applications.  


Niobium is a very soft refractory metal with an extremely high melting point and corrosive resistant properties. High thermal/electric conductivity, easily fabricated and bio-compatible.  

Chemistry: Ingot 

Element Niobium | Type 1 Reactor Grade Balance | Type 2 Commercial Grade Balance

Element Carbon | Type 1 Reactor Grade 0.01 | Type 2 Commercial Grade 0.01

Element Nitrogen | Type 1 Reactor Grade 0.01 | Type 2 Commercial Grade 0.01

Element Oxygen | Type 1 Reactor Grade 0.015 | Type 2 Commercial Grade 0.025

Element Hydrogen | Type 1 Reactor Grade 0.0015 | Type 2 Commercial Grade 0.0015

Element Zirconium | Type 1 Reactor Grade 0.02 | Type 2 Commercial Grade 0.02

Element Tantalum | Type 1 Reactor Grade 0.1 | Type 2 Commercial Grade 0.3 

Element Iron | Type 1 Reactor Grade 0.005 | Type 2 Commercial Grade 0.005

Element Silicon | Type 1 Reactor Grade 0.005 | Type 2 Commercial Grade 0.005 

Element Tungsten | Type 1 Reactor Grade 0.03 | Type 2 Commercial Grade 0.05

Element Nickel | Type 1 Reactor Grade 0.005 | Type 2 Commercial Grade 0.005

Element Molybdenum | Type 1 Reactor Grade 0.020 | Type 2 Commercial Grade 0.020

Element Hafnium | Type 1 Reactor Grade 0.02 | Type 2 Commercial Grade 0.02

Element Titanium | Type 1 Reactor Grade 0.02 | Type 2 Commercial Grad 0.02

Below Elements When Specified: 

Boron - 2ppm

Aluminum - 0.002 - 0.005 

Beryllium - 0.005

Chromium - 0.002 

Cobalt - 0.002 

Physical Properties 

Density: 0.310 lbs/in3, 8.66 g/cm3 

Mean Coefficient of Thermal Expansion, in/in/° F (mm/m/° C)
70 - 212 °F (20 - 100 ° C): 4.05 x 10-6 (7.3) 

Thermal Conductivity: (W/m-° K) 
(21 ° C): 53.7 

Modulus of Elasticity, ksi (MPa) 
1.52 x 103 (104.9 x 103) in tension 

Melting Point: 4490 ° F (2477 ° C) 


Coil - Strip, Foil, Ribbon 
Wire - Profile, Round, Flat, Square 

Mechanical Properties at Room Temperature 

Annealed: Typical 

Ultimate Tensile Strength: 18 KSI min (124 MPa min)
Yield Strength (0.2% offset): 10.5 KSI min (72 MPa min)
Gauges: less than 0.010 inches: 15% min 
Gauges: 0.010 inches and greater: 20% min

*Niobium Type 1 and Type 2 can be cold rolled to various tempers. Contact Ulbrich Technical Service for additional information.

Additional Properties 

Corrosion Resistance 

Refer to NACE (National Associate of Corrosion Engineers) for recommendations. 


#1 - Hot rolled annealed and descaled. It is available in strip, foil and ribbon. It is used for applications where a smooth decorative finish is not required. 
#2D - Dull finish produced by cold rolling, annealing and descaling. Used for deep drawn parts and those parts that need to retain lubricants in the forming process. 
#2B - Smooth finish produced by cold rolling, annealing and descaling. A light cold rolling pass is added after anneal with polished rolls giving it a brighter finish than 2D. 
#BA- Bright annealed cold rolled and bright annealed 
#CBA- Course bright annealed cold rolled matte finish and bright anneal 
#2 - Cold Rolled 
#2BA- Smooth finish produced by cold rolling and bright annealing. A light pass using highly polished rolls produces a glossy finish. A 2BA finish may be used for lightly formed applications where a glossy finish is desired in the formed part. 
Polished - Various grit finish for specific polish finished requirements. 

*Not all finishes are available in all alloys - Contact Ulbrich Sales for more information.

Wire Finishes 

XC - Extra clean. Bright annealed or bright annealed and cold rolled Grease - Ultra bright finish for decorative applications 

Soap - Soap is not removed from tempered wire to act as a lubricant. 

*Contact Ulbrich Wire for custom finishes.

Heat Treatment 

Niobium Type 1 and Type 2 are non hardenable by heat treatment. They can only be hardened by cold working. 


For best results refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods". 

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document. 

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