Niobium Properties

niobium mechanical physical properties specifications chemistryNiobium is a refractory metal with properties that are applicable for fabricated parts.  The tables below contain the physical, mechanical, chemistry and specifications for evaluating Niobium for use in your next application.  Niobium can be bent, spun, deep drawn and formed at room temperatures up to its maximum work hardening.

To download an EFINEA Niobium data sheet, or any other Refractory Metals & Alloys data sheets, please go to the Data Sheets section in our Technical Library.

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Niobium Typical Physical Properties

Melting Point°F4474
Electrical ResistivityMicro-ohm-cm15.1
Thermal ConductivityBTU-in/hr-ft2-°F (@68°F)363
W/m-K (@20°C)52.3
Specific Heat CapacityBTU/lb-°F0.065
Coefficient of Linear Thermal Expansionµin/in-°F (@68 - 212°F) 3.94
µm/m-°C (@20 - 100°C) 7.10
Source: MatWeb. Material in the annealed condition

Niobium Typical Mechanical Properties

Ultimate Tensile Strength
Rod 0.125" to 2.5"psi (MPa), Min18000 (125)
Wire 0.020" to 0.124"18000 (125)
Strip, Sheet, Plate*18000 (125)
Yield Strength
Rod 0.125" to 2.5"psi (MPa)10500 (73)
Strip, Sheet, Plate*10500 (73)
Rod 0.125" to 2.5"min % mmA25
Wire 0.020" to 0.124"20
0.010"* or Greatermin % in 1" length20
Less than 0.010"*15
Source: ASTM B392-18 Table 3, *ASTM B393-18 Table 4. Types 1&2, Annealed Condition (90% Minimum Recyrstallized). A10 in. (254mm) gage length to 0.050 in. (1.27 mm) diameter, and 1 in. (25.4 mm) or 2.0 in. (50.8 mm) gage length equal to or over 0.050 in. (1.27 mm).

Niobium Chemistry

Minimum % 99.6

Niobium Specifications

ASTM B392-18 (Bar, Rod & Wire)
Types 1 & 2
ASTM B393-18 (Bar, Rod & Wire)
Types 1 & 2
AMS 7850UNS RO42000UNS R04210

For additional information on specifications of the materials distributed by EFINEA, please visit the websites of the international organizations that develop and publish technical standards: ASTM International and ASM International.

EFINEA is the leading supplier of refractory metals since 1965.  We supply, regardless of size, all industries that use our special purpose metals and alloys in their applications.