Key parameters to evaluate when selecting a nitinol tubing or component contract manufacturer.
| Metric | Typical Range | Impact on Procurement |
|---|---|---|
| AF Tolerance | +/- 3 to 5 °C | Ensures reliable in vivo deployment. |
| Surface condition | Oxide etched, centerless ground, electropolished, cleaned | A dimensionally correct nitinol tube can still fail if oxide or surface condition is wrong for the application. |
| Traceability depth | Chemistry, heat lot, transformation target, and processing notes | Supports supplier qualification and repeatability across prototype and pilot lots. |
| Decision Factor | Confirm Before Quote | Buyer Impact |
|---|---|---|
| Transformation target | Af temperature, use temperature, superelastic or shape-memory function, and verification method. | Prevents a supplier from meeting dimensions while missing the functional behavior. |
| Surface state | Oxide, etched, ground, electropolished, passivated, or cleaned condition by application. | Controls friction, corrosion, coating readiness, and downstream assembly behavior. |
| Repeatability evidence | Material certificate, lot traceability, heat-treatment notes, dimensional report, and inspection method. | Gives quality teams evidence to compare sample, pilot, and production lots. |
Black oxide can affect surface condition, friction, and application-specific validation requirements.
Nitinol sourcing must cover chemistry, transformation temperature, heat-treatment route, surface condition, fatigue assumptions, and traceability, not only OD and wall tolerance.
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