Technical guide · 2026-08-14
Niobium Alloys
Niobium products span high-purity superconducting sheet and tube to oxidation-sensitive C-103 aerospace alloy, so purity, residual resistance or high-temperature coating requirements belong to different purchase paths.
01
Definition and boundary
Includes pure Nb and niobium-base alloys; excludes low-level niobium additions in HSLA steel and nickel superalloys.
Reference information only: final acceptance is controlled by the ordered product specification, condition, dimensions and certified test results.
02
How the material system works
High-purity Nb becomes superconducting.
Hf/Ti strengthen C-103.
Oxygen pickup degrades ductility and hot life.
03
Representative grades and systems
| Grade or system | Selection focus | Qualification |
|---|---|---|
| R04200 unalloyed Nb | Reactor-grade unalloyed niobium. | Confirm the governing product specification, delivery condition, section size and acceptance tests before treating designations as interchangeable. |
| High-RRR niobium | Superconducting material with purity/performance controls. | Confirm the governing product specification, delivery condition, section size and acceptance tests before treating designations as interchangeable. |
| C-103 | Nb-Hf-Ti aerospace high-temperature alloy. | Confirm the governing product specification, delivery condition, section size and acceptance tests before treating designations as interchangeable. |
04
Properties and trade-offs
Superconductivity by purity
Low-density refractory strength
Severe oxidation sensitivity at heat
05
Product forms and supply conditions
06
Applications and selection
Applications and selection
- SRF cavities
- Rocket nozzles
- Chemical and electronic parts
Properties and trade-offs
- Separate RRR from structural acceptance.
- Plan coating for hot oxidizing service.
- Use exact melt and thermomechanical route.
07
Fabrication, durability and inspection
Prevent oxygen contamination.
Qualify deep drawing for cavity sheet.
Control coating and weld cleanliness.
08
Procurement checklist
- State pure Nb/high-RRR/C-103 route.
- Define purity, RRR or alloy chemistry.
- Specify grain, surface, weld/NDT and coating acceptance.
09
Standards, sources and review
Standards and designation context
- Applicable ASTM B10 product specification
- Buyer drawing and material condition
- Qualified joining and inspection procedure