The NASA Tribometer friction comparison of Nitinol 60 to 440C stainless is shown to the right. The left vertical line gives the coefficient of friction when a small amount of Penzane lubricant is applied to the balls. The horizontal line depicts the number of revolutions:

Nitinol - Tribometer plates for NASA’s test machine
Tribometer plates for NASA's test machine

Corosion Data
Salt Spray Test per ASTM B117, Hours in Salt Spray until Failure.

Material Hours of Exposure
440 C SS 4 hours
Type 316 SS 400 hours
Nitinol 60 No signs of corrosion after 4000 hours
Nominal Comparative Properties for Conventional Bearing Alloys, 55NiTi and 60 NiTi
(Representative thermophysical and mechanical properties of bearing materials)

Property 60NiTi 55NiTi 440C Si3N4 M-50
Density, g/cc 6.7 6.5 7.7 3.2 8.0
Hardness 56 to 62 RC 35 to 40 RC 58 to 62 RC 1300 to 1500 Hv 60 to 65 RC
Thermal conductivity W/m-° K 18 9 24 33 36
Thermal expansion ~10x10-6/°C ~10x10-6/°C ~10x10-6/°C 2.6x10-6 ~11x10-6/°C
Magnetic Non Non Mag Non Mag
Corrosion resistance Excellent Excellent Marginal Excellent Poor
Tensile/flexural strength, MPa *TBD -900 1900 600 to 1200
(bend strength)
Young’s modulus, GPa ~114 ~100 200 310 210
Poisson’s ratio TBD TBD 0.3 0.29 0.30
Fracture toughness TBD TBD 22 MPa/√m 5 to 7 MPa/√m 20 to 23 MPa/√m
Maximum use temperature, ºC ~400 ~400 ~400 ~1100 ~400
Electrical resistivity ~80X10 6 Ω-cm ~80X10 6 Ω-cm ~36X10 6 Ω-cm Insulator ~60X10 6 Ω-cm
*TBD means to be determined

Let’s Work Magic Together
Now that Abbott has discovered how to work with Nitinol 60, we’re eager to work with you: Let us help develop your applications for the 21st century. Our materials and manufacturing engineers welcome the opportunity to discuss the unique parameters of your material design requirements.
Please contact our Technical Director, Glenn Glennon, at: