ASTM B654 Niobium-Hafnium Alloy Foil, Sheet, Strip, and Plate

  • Type: Foil, sheet, strip, and plate.
  • Niobium-Hafnium Alloy
  • Grade: UNS R04295, 89Nb-10Hf-Ti, C-103

Features

ASTM B654/B654M C-103 Niobium-Hafnium Alloy Foil, Sheet, Strip, and Plate

Chemical Composition (wt.%) for UNS R04295/89Nb-10Hf-Ti/C-103 Niobium-Hafnium refractory alloy sheet, plate and strip

UNS No. C, max O, max N, max H, max Hf, max Ti, max Zr, max W, max Ta, max Nb, max
UNS R04295 0.015 0.025 0.01 0.0015 9月11日 0.7-1.3 0.7 0.5 0.5 Balance

Additional Chemical Requirements (wt.%) for Finished Products of UNS R04295/89Nb-10Hf-Ti/C-103 Niobium-Hafnium refractory alloy sheet, plate and strip

UNS No. C, max O, max N, max H, max
UNS R04295 0.015 0.025 0.01 0.0015

Mechanical Properties for UNS R04295/89Nb-10Hf-Ti/C-103 Niobium-Hafnium refractory alloy sheet, plate and strip, Annealed Condition (90 % Minimum Recrystallized)

Conditions Tensile Strength (Mpa) Yield Strength (Mpa) Elongation %
Material 0.05 in. [1.3 mm] and thinner:

Room temperature

2000 ± 25°F [1100 ± 15°C]

385 275 20
145 110 20
Material greater than 0.05 in. [1.3 mm] in thickness:

Room temperature

2000 ± 25°F [1100 ± 15°C]

370 260 20
145 110 20

Technical Specifications

Specification Value
Standard ASTM B654 C-103 Niobium-Hafnium Alloy Foil, Sheet, Strip, and Plate
Grade UNS R04295, C-103, 89Nb-10Hf-Ti
Condition & Finish Annealed condition; clean, bright finish, free of defects and surface imperfections.
Type Foil, Plate, Sheet, Strip
Dimension Foil Width:≤150mm x Thickness:≤0.13mm
Plate Width:≥150mm x Thickness:≥4.8mm
Sheet Width:≥150mm x Thickness: 0.13-4.8mm
Strip Width:≤150mm x Thickness:0.13-4.8mm
Inspection Certificate EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection)
 Test Flatness %=(H/L) x 100, Chemical analysis, Tensile test, Hardness test, and Microstructural examination
Key Features

High Melting Point: C-103 boasts a very high melting point, exceeding 2400°C (4350°F), making it suitable for extreme temperature environments.
Strength at Elevated Temperatures: Maintains excellent strength and creep resistance even at high temperatures, making it ideal for structural components in demanding applications.
Corrosion Resistance: Exhibits good resistance to oxidation and corrosion, further enhancing its suitability for harsh environments.
Low Neutron Capture Cross-Section: C-103 has a relatively low neutron capture cross-section, making it attractive for nuclear applications where neutron transparency is desired.

Packing

Packed in plywood boxes.

Application

Rocket Nozzles and Thrusters: Niobium-hafnium alloys are used in critical components of rocket engines and thrusters due to their exceptional high-temperature strength and resistance to extreme thermal environments.
Hypersonic Vehicles: They find application in structural components and leading edges of hypersonic vehicles that experience extreme temperatures and aerodynamic forces.
Nuclear Reactor Components: Certain niobium-hafnium alloys are used for specialized components in nuclear reactors, such as fuel cladding and control rods, due to their high-temperature resistance and low neutron absorption.
Heating Elements and Structural Components: These alloys are employed in high-temperature furnaces and equipment for applications requiring exceptional temperature resistance and strength.
Materials Science and Engineering: Niobium-hafnium alloys are studied and used in materials science and engineering research due to their unique properties and potential for pushing the boundaries of material performance.
Rocket engine nozzle extensions: Niobium-hafnium alloys are used for nozzle extensions in rocket engines due to their ability to withstand the extreme heat and erosive forces of rocket exhaust.
Hypersonic vehicle leading edges: These alloys protect the leading edges of hypersonic vehicles from the intense heat generated during hypersonic flight.
Nuclear reactor control rods: Niobium-hafnium alloys with high hafnium content are used for control rods in nuclear reactors due to their ability to absorb neutrons and control the nuclear fission process.

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