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In many cases, Nitinol is substituted in an application which has traditionally used stainless steel. In most cases, the Nitinol is substituted to take advantage of its unique superelasticity or shape memory capabilities.

Nitinol vs Stainless Steel
Property Nitinol Stainless Steel

Recovered Elongation

8%

0.8%

Biocompatibility*

Excellent Fair
Effective Modulus**

approx. 48 GPa

193 GPa

Torqueability Excellent Poor
Density 6.45 g/cm3 8.03 g/cm3
Magnetic No Yes
UTS approx. 1,240 MPa approx. 760 MPa
CTE Martensite - 6.6 x 10-6 cm/cm/deg.C 17.3 x 10-6 cm/cm/deg.C
  Austenite - 11.0 x 10-6 cm/cm/deg.C  
Resistivity 80 to 100 micro-ohm*cm 72 micro-ohm*cm

* Please see Nitinol Biocompatibility for more information.

** The modulus of Nitinol is highly non-linear, and it is not nearly as stiff as stainless steel. Please see Introduction to Shape Memory and Superelasticity for an example of a superelastic Nitinol stress-strain curve.