Nitinol Tube

Flexible, superelastic and biocompatible Niti-tubes

Nitinol is a unique material. No other material exhibits the mechanical shape memory superelasticity and the thermal shape memory effects. This is especially true for Nitinol tubing.

Fields of applications of Nitinol tubes are peripheral stents, cardio stents and other medical devices for the human body. We only deliver Nitinol tubes with the mechanical properties, requested tolerances and appropriate surface quality for stent use. All our Niti tubes are made according to customers specifications.

Nitinol tubing for medical devices

Medical devices use requires high quality surface on Nitinol tubing. The technology and tube making processes developed by Vascotube have been perfected over many years of practice. Using our experience, combined with new technologies and custom made machinery, we have been able to develop a drawing process that avoids the need for slurry cleaning, chemical cleaning or mechanical removal operations on the inner surface of the drawn tube. Our process allows us to attain a roughness value of Ra 0,1 µm.

In the last years we have pushed the feasibility of dimensions to seize up to an outer diameter of 0.59 inches, thus achieving to keep the high quality inner surface of our tubes.

Concentricity tolerances are up to 0,01 mm
Wall tolerances as narrow as ± 0,0075 mm

We manufacture the Nitinol tubing according to ASTM F 2063.

Small Nitinol tube with 0.24mm diameter

Large Nitinol tube with 15mm diameter

Chemical Composition:

Component wt %
Nickel 54,50-57,00
Cobalt max. 0,050
Iron max. 0,050
Carbon max. 0,050
Nioium max. 0,025
Copper max. 0,010
Chromium max. 0,010
Oxygen + Nitrogen max. 0,050
Hydrogen max. 0,005
Titanium balance

Mechanical / Superelastic Tubes Properties:

Ultimate Tensile Strength min. 1000 MPa
Fracture Elongation min. 10 %
Loading Plateau Stress (at 3% strain) min. 380 MPa
Permanent Set (after 6% strain) max. 0,3 %
Austenite Finish Temperature(Af) max. 15 °C

Note: The Mechanical / Superelastic Properties are only for orientation and can be changed if necessary.

Physical Tube Properties:

Melting Point 1310 °C
Density 6,5 g/cm3
Specific el. Resistivity 82 μΩcm
Coefficient of Thermal Expansion (CTE) 11×10-6 °K
Modulus of Elasticity 41-75 GPa