Golden Sunbird Metals is a premier supplier of hafnium and hafnium alloys in China, specializing in high-quality hafnium and hafnium alloy rods, wire, particles, plate, sheet, and strip products at wholesale prices with the option for customization to meet specific requirements. Our hafnium alloys are renowned for their exceptional performance in high-temperature environments, making them ideal for use in aerospace and nuclear industries. At Golden Sunbird Metals, we are committed to meeting the diverse needs of our customers. If you’re interested in purchasing our hafnium alloy products in bulk or need customized solutions, please contact us at [email protected].

FAQs

Hafnium (Hf) is a premium refractory metal known for its high melting point (2,233°C / 4,051°F), density of 13.31 g/cm³, outstanding corrosion resistance (protective oxide layer similar to zirconium), exceptional high-temperature stability, and — most uniquely — extremely high thermal neutron absorption cross-section (~104 barns). This makes it irreplaceable in nuclear applications. The primary commercial grades per ASTM B776 (strip, sheet & plate) and ASTM B737 (rod & wire) are:

  • R1 — Nuclear grade hafnium (unalloyed, ultra-low impurities for nuclear service).
  • R3 — Commercial grade hafnium (unalloyed, for general and alloying applications).

Both grades are supplied in annealed condition for maximum ductility. (Note: These are unalloyed hafnium grades; the specification title includes “Hafnium Alloy” to cover minor commercial variants and alloying stock.)

Typical maximum limits (wt %) per ASTM B776 Table 1 (balance Hf; Zr typically ≤4.5% and controlled for nuclear/commercial use):

Element Grade R1 (Nuclear) Grade R3 (Commercial)
Aluminum 0.01% 0.05%
Carbon 0.02% 0.03%
Chromium 0.01% 0.05%
Copper 0.01% –
Hydrogen 0.0025% (approx.) 0.01%
Iron 0.05% 0.08%
Molybdenum 0.01% –
Nickel 0.01% –
Niobium 0.01% –
Nitrogen 0.01% 0.02%
Oxygen 0.04% 0.13%
Silicon 0.01% 0.05%
Tantalum 0.02% –

R1 features significantly tighter limits on impurities (especially neutron-absorbing elements) for nuclear safety and performance. Full composition and additional trace limits (e.g., boron, cadmium) are detailed in ASTM B776.

  • Melting point: 2,233°C (4,051°F) for both grades.
  • Density: 13.31 g/cm³ (0.481 lb/in³) — dense yet provides excellent strength-to-weight in high-temp or nuclear service.
  • Corrosion resistance: Outstanding; self-passivating oxide film resists most acids, alkalis, and hot/cold aqueous media (except HF and concentrated sulfuric with oxidizers). Comparable to zirconium but with superior neutron properties.
  • Neutron absorption: Exceptionally high — ideal for nuclear control rods (R1 grade).
  • Mechanical (annealed, room temperature, per ASTM requirements): Excellent ductility and formability; high strength retention at elevated temperatures. Specific tensile and bend requirements are defined in ASTM B776 Table 3.
  • Other benefits: Good thermal conductivity, low vapor pressure, stability from cryogenic to extreme heat, and fabricability similar to titanium or zirconium. R1 delivers proven nuclear-grade purity and performance; R3 offers cost-effective commercial versatility.

Hafnium excels where neutron absorption, extreme corrosion resistance, or high-temperature durability are required:

  • R1 (Nuclear Grade): Nuclear reactor control rods, safety rods, and structural components; nuclear submarines; research reactors (outstanding neutron absorber without fission).
  • R3 (Commercial Grade): Alloying addition for refractory metals (e.g., niobium-hafnium alloys like C-103); high-temperature furnace hardware; corrosion-resistant chemical processing equipment; plasma arc cutting electrodes; medical treatment devices; fuel cells; solar energy absorbers.

Both grades are used in aerospace, electronics, and specialty fabrication where zirconium or tantalum alternatives cannot match the neutron or combined performance needs.

  • R1 (Nuclear): Strictest impurity control ensures maximum neutron absorption efficiency and radiation stability — the industry standard for safety-critical nuclear components.
  • R3 (Commercial): Higher impurity tolerance delivers excellent performance at lower cost; ideal for alloying additions and non-nuclear high-temp/corrosion applications. Both grades offer unmatched neutron capture + corrosion resistance with superior fabricability versus other refractories. R1 vs. R3 provides the perfect balance of nuclear purity versus commercial economics.