Zirconium Tube (Hf > 0.2%)

Hafnium (more than 0.2% Zirconium) Tube is a refractory metal product combining hafnium’s high corrosion resistance, neutron absorption capacity, and excellent thermal stability with minor zirconium presence. In tube form, it is ideal for nuclear, aerospace, and high-temperature environments where reliability is critical. Industries employ hafnium tubes in control rods, aerospace thermal shielding, and advanced electronic vacuum systems. Specific applications include structural tubing in reactor assemblies, thermal liners in aerospace propulsion, and high-purity conduits in semiconductor fabrication. In research, hafnium tubes are investigated for creep resistance, phase stability, and oxidation protection under extreme conditions. Their ability to withstand thermal and chemical extremes ensures these tubes remain vital in nuclear energy systems, aerospace propulsion technologies, and advanced research infrastructure.

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Tolerance

Properties

Reference & Citations

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Tolerances

Tube

Outside Diameter	=<2mm	±0.05mm
Outside Diameter	2mm - 5mm	±0.1mm
Outside Diameter	>5mm	±5%
Wall Thickness		±10%

Material Properties for Metals

Atomic Properties

Element	Value
Atomic number	40
Crystal structure	Hexagonal close packed
Electronic structure	Kr 4d² 5s²
Valences shown	2,3,4
Atomic weight( amu )	91.22
Thermal neutron absorption cross-section( Barns )	0.182
Photo-electric work function( eV )	3.8
Natural isotope distribution( Mass No./% )	96/ 2.8
Natural isotope distribution( Mass No./% )	92/ 17.1
Natural isotope distribution( Mass No./% )	91/ 11.2
Natural isotope distribution( Mass No./% )	94/ 17.5
Natural isotope distribution( Mass No./% )	90/ 51.4
Atomic radius - Goldschmidt( nm )	0.16
Ionisation potential( No./eV )	4/ 34.34
Ionisation potential( No./eV )	Jun-99
Ionisation potential( No./eV )	2/ 13.13
Ionisation potential( No./eV )	1/ 6.84
Ionisation potential( No./eV )	5/ 81.5
Ionisation potential( No./eV )	3/ 22.99

Mechanical Properties

Element	Value
Material condition	Polycrystalline
Material condition	Soft
Poisson's ratio	0.38
Poisson's ratio	0.38
Bulk modulus( GPa )	89.8
Bulk modulus( GPa )	89.8
Tensile modulus( GPa )	98
Tensile modulus( GPa )	98
Hardness - Vickers( kgf mm⁻² )	85-100
Tensile strength( MPa )	350-390
Yield strength( MPa )	250-310

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	44@20@20°C
Superconductivity critical temperature( K )	0.61
Temperature coefficient( K⁻¹ )	0.0044@0-100°C
Thermal emf against Pt (cold 0C - hot 100C)( mV )	1.17

Physical Properties

Element	Value
Boiling point( C )	4377
Density( gcm⁻³ )	6.49@20°C

Thermal Properties

Element	Value
Melting point( C )	1852
Latent heat of evaporation( J g⁻¹ )	6360
Latent heat of fusion( J g⁻¹ )	211
Specific heat( J K⁻¹ kg⁻¹ )	281@25°C
Thermal conductivity( W m⁻¹ K⁻¹ )	22.7@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	5.9@0-100°C