Nitinol Tube

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Nitinol is a metal alloy, it exhibits two closely related and unique properties: shape memory and superelasticity. Superelasticity occurs in a narrow temperature range just above the transformation temperature; in these conditions, no heating is necessary to return to the pre-deformation shape. We only provide nitinol tube with Superelastic Effec-An elastic (reversible) responses to an applied temperature, caused by a phase transformation between the austenitic and martensitic phases of a crystal.

Active Austenite Finish Temperature of Nitinol Tube
The austenite finish temperature of the finished tube (active Af) with outer diameter in the range of 0.3 to 3.0 mm (0.012 to 0.12 in.) shall be measured on representative full round tube sample(s) using the bend and free recovery method described in Test Method ASTM F 2082-15.

Mechanical Properties & Surface Finish

Condition UTS
σb MPa
Elongation
δ%
Upper Plateau Stressσload MPa Active Af ℃
Superelastic >1000 ≥10 ≥380 <20

* Superelastic properties are measured per Test Method F2516 at room temperature (22+/-2℃)
* Applicable Standard: ASTM F2633

-Outer surface: Black oxide or Center-less Ground.
-Inner surface: Etched or oxide.
Other finishes can be discussed with EdgeTech Industries.

Nominal Dimensions and Tolerances of Nitinol Tube

Nominal OD/ID mm (in) Diameter tolerance mm (in)
≤1.5 (0.059) +/-0.025 (+/-0.001)
1.5<OD≤6.5 (0.059~0.256) +/-0.050 (+/-0.002)
6.5<OD≤10 (0.256~1.2) +/-0.075 (+/-0.003)

* Other variation in OD and ID can be discussed.

Length &Straightness of Nitinol Tube
Nitinol tube can be delivered in either exact length or random length, for random length orders, a maximum and minimum length shall be discussed. Straightness requirements and measurement methods shall be discussed.

Permissible Outer and Inner Surface Imperfections of Nitinol Tube
Outer and inner surface imperfections criteria on tubes shall be discussed.

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