ASTM B654 C-103 Niobium-Hafnium Alloy Sheet and Plate
- Type: Foil, sheet, strip, and plate
- Niobium-Hafnium Alloy
- Grade: UNS R04295, 89Nb-10Hf-1Ti, C-103, Nb10Hf1Ti
- StandardASTM B654/B654M
- ConditionAnnealed
- Surface FinishClean, Bright Finish
- Form: Foil / Sheet / Strip / Plate
- Inspection: EN 10204 3.1 / 3.2
- Application: High-Temperature Aerospace
- Thickness Range: Foil ≤0.13 mm / Sheet 0.13–4.8 mm / Plate ≥4.8 mm / Strip 0.13–4.8 mm
ASTM B654/B654M C-103 Niobium-Hafnium Alloy Sheet and Plate
ASTM B654/B654M C-103 Niobium-Hafnium Alloy Sheet and Plate (UNS R04295 / Nb-10Hf-1Ti) is a premium high-temperature refractory alloy engineered for the most extreme aerospace and propulsion environments. By alloying niobium with approximately 10% hafnium and 1% titanium, C-103 delivers exceptional tensile strength, creep resistance, and oxidation performance at temperatures up to 2000 °F (1100 °C) and beyond, while maintaining excellent room-temperature ductility and superior weldability—properties that significantly outperform pure niobium. Manufactured strictly to ASTM B654/B654M standards and supplied in annealed, cold-worked, or stress-relieved conditions with a clean, bright surface finish, this alloy is the material of choice for rocket engine nozzles, thrusters, spacecraft heat shields, jet engine hot-section liners, and other critical high-temperature structural applications in aerospace, defense, and advanced industrial systems. Available in sheet, plate, and strip forms across a wide range of thicknesses and sizes, Golden Sunbird Metals’ C-103 products offer reliable performance, full traceability, and EN 10204 3.1/3.2 certification to meet the stringent requirements of critical missions and extreme environments.
UNS R04295, 89Nb-10Hf-1Ti, C-103, Nb10Hf1Ti Niobium-Hafnium alloy sheet and plate Chemical Composition (wt.%)
| 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 | 9.0-11 | 0.7-1.3 | 0.7 | 0.5 | 0.5 | Balance |
Additional Chemical Requirements (wt.%) for Finished Products
| UNS No. | C, max | O, max | N, max | H, max |
| UNS R04295 | 0.015 | 0.025 | 0.01 | 0.0015 |
UNS R04295, 89Nb-10Hf-1Ti, C-103, Nb10Hf1Ti Niobium-Hafnium alloy sheet and plate, Annealed Condition (90 % Minimum Recrystallized) Mechanical Properties
| 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 |
Features
- ASTM B654/B654M C-103 niobium-hafnium alloy foil, sheet, strip, and plate for high-temperature aerospace service.
- Available as UNS R04295, 89Nb-10Hf-1Ti, C-103, Nb10Hf1Ti, a Niobium-base alloy with approximately 10% Hafnium and 1% Titanium.
- Supplied in annealed condition with a clean, bright finish and controlled surface quality.
- Suitable for forming into foil, sheet, strip, and plate thicknesses for precision fabrication.
- High strength at elevated temperature with good thermal stability for extreme environments.
- Available with inspection certificate options and standard testing for quality-critical projects.
Technical Specifications
| Specification | Value |
| Standard | ASTM B654 UNS R04295, 89Nb-10Hf-1Ti, C-103, Nb10Hf1Ti Niobium-Hafnium alloy sheet and plate |
| Grade | UNS R04295, 89Nb-10Hf-1Ti, C-103, Nb10Hf1Ti |
| 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 |
Packing & Shipment
To ensure product safety during storage, handling, and international transportation, niobium-hafnium alloy (C-103 / UNS R04295) sheets, plates, strips, and foils are packed with corrosion protection and impact protection measures according to product size, quantity, and shipping mode.
| Item | Packing / Shipment Method |
| Internal Protection | Sheets, plates, strips, and foils are thoroughly cleaned, dried, and free of all contaminants before packing; all surfaces receive a temporary protective film or oil-free coating suitable for refractory metals. |
| Sealing Protection | Each sheet, plate, or stack is individually wrapped or placed in sealed PE bags / vacuum-sealed packaging to prevent dust, moisture, and oxidation. |
| Surface Protection | Critical bright-finish surfaces are covered with soft non-woven fabric, EPE foam liners, or acid-free interleaving paper/film placed between each sheet/plate to prevent scratches, dents, and direct contact. |
| Individual Packing | Smaller sheets, strips, and foils are wrapped with PE film and packed in sturdy plywood boxes or export-grade wooden crates with sufficient cushioning materials. |
| Large / Heavy Plate Packing | Larger or thicker plates are stacked with protective interlayers, clearly labeled, and secured on wooden pallets or reinforced export crates; heavy plates use additional steel banding or custom cradles to prevent bending or warping. |
| Shock Protection | High-density foam padding, internal bracing, wooden blocking, and heavy-duty strapping are used to prevent movement and impact during transit. |
| Moisture Control | Desiccant bags and humidity indicator cards are placed inside the sealed package to control moisture and prevent oxidation. |
| Marking | Package labels include product name, grade (C-103 / UNS R04295), dimensions (thickness × width × length), condition (annealed / cold worked / stress-relieved), quantity, net/gross weight, heat number, and shipping marks. |
| Shipping Mode | By sea (FCL / LCL), air freight, or multimodal transport depending on order quantity and delivery requirements. |
| Documents | Packing list, commercial invoice, certificate of origin, material test certificates (EN 10204 3.1 / 3.2), chemical analysis reports, and inspection documents provided. |
Applications
- High-thrust rocket nozzles and thrusters.
- Satellites, spacecraft, and launch vehicle components.
- Jet engine afterburner flap sections and other hot-zone aerospace parts.
- Hypersonic vehicle thermal-structure components.
- High-temperature structural parts exposed to vibration, thermal shock, and severe heat loads.
