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Nitinol Superelastic Wire Manufacturer and Supplier in India

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Nitinol Superelastic Wire is a nickel-titanium (NiTi) alloy wire which has a notable characteristic of bending significantly when it is loaded and will recover its shape when the load is removed, without the need for application of heat, provided that it is used above its Af temperature. When stressed, the wire changes to stress induced martensite, and reverts to austenite upon unloading, up to about 8% recoverable. It is flexible, strong against fatigue and easily recovers its shape, making it suitable for use in medical applications, for guidewires, actuators, sensors, robotics and precision engineering. It is provided with a controlled nickel content, set diameters and surface conditions. Sachin Steel Centre is a manufacturer, supplier of Nitinol Superelastic Wire of various sizes and material certifications for the Engineering, Medical, Research, Industrial markets in India and export countries.

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Table Of Content

Technical Data

Specifications of Nitinol Superelastic Wire

Technical Parameter

Manufacturing & Material Specification

Chemical Composition

Nickel-Titanium alloy (Ni 54.5 to 57.0 wt%, Ti balance) conforming to ASTM F2063

Material Standards

ASTM F2063 / ASME SF2063 (Wrought Nickel-Titanium Shape Memory Alloys for Medical Devices and Surgical Implants)

Testing & Verification Standards

ASTM F2004 (DSC Thermal Test), ASTM F2082 (Bend & Free Recovery Test), ASTM F2516 (Superelastic Tensile Test)

Supply Form

Precision round wire on DIN/P-spools and continuous coils, and straightened cut lengths

Delivery Condition

Superelastic condition (cold-drawn followed by continuous thermal shape-straightening)

Active Af Range

Below room temperature: −15 to +18 °C (custom Af tuned from −30 to +20 °C on request)

Diameter Range

0.025 mm (0.001 in) to 6.00 mm (0.236 in); custom fine wire spools and drawn sizes available

Dimensional Tolerances

Diameter tolerance from ±0.002 mm (precision fine wire below 0.1 mm) to ±0.100 mm; see the tolerance table

Surface Finishes

As-drawn black oxide, chemically pickled, micro-etched, centerless ground, or electropolished

Density

6.45 g/cm³ (0.233 lb/in³)

Quality Certification

EN 10204 3.1 material test certificate with heat chemistry, tensile results and Af result (DSC or bend and free recovery)

Chemical Composition of Nitinol Superelastic Wire

Element

Minimum (wt %)

Maximum (wt %)

Nickel (Ni)

54.5

57.0

Titanium (Ti)

Balance

Balance

Carbon (C)

—

0.050

Oxygen + Nitrogen (O + N)

—

0.050

Cobalt (Co)

—

0.050

Iron (Fe)

—

0.050

Niobium (Nb)

—

0.025

Copper (Cu)

—

0.010

Chromium (Cr)

—

0.010

Hydrogen (H)

—

0.005

Mechanical Properties of Nitinol Superelastic Wire

Mechanical Property

Typical Value Range

Austenite Young’s Modulus (Ea)

41 to 83 GPa

Upper Plateau Stress (UPS)

380 MPa minimum (typically 380 to 550 MPa)

Lower Plateau Stress (LPS)

150 MPa minimum (typically 150 to 300 MPa)

Permanent Set / Residual Elongation

0.5% maximum (typically 0.3% maximum)

Ultimate Tensile Strength (UTS)

1070 MPa minimum (up to 1900 MPa)

Elongation to Failure

≥10%

Max Recoverable Superelastic Strain

Up to 8.0%

Poisson’s Ratio

0.33

Physical Properties of Nitinol Superelastic Wire

Physical Property Parameter

Metric Units

Imperial Units

Density

6.45 g/cm³

0.233 lb/in³

Melting Point Range

~1300 to 1310 °C

~2370 to 2390 °F

Electrical Resistivity (Austenite Phase)

~80 to 100 µΩ·cm

~31 to 39 µΩ·in

Electrical Resistivity (Martensite Phase)

~70 to 80 µΩ·cm

~28 to 31 µΩ·in

Thermal Conductivity (Austenite Phase)

~18 W/(m·K)

~10.4 BTU/(ft·h·°F)

Thermal Conductivity (Martensite Phase)

~8.5 W/(m·K)

~4.9 BTU/(ft·h·°F)

Coefficient of Thermal Expansion (Austenite)

~11 × 10−6 /°C

~6.1 × 10−6 /°F

Coefficient of Thermal Expansion (Martensite)

~6.6 × 10−6 /°C

~3.7 × 10−6 /°F

Specific Heat Capacity

837 J/(kg·K) (0.837 J/g·°C)

0.20 BTU/(lb·°F)

Latent Heat of Transformation

~24.2 J/g

~10.4 BTU/lb

Tolerance Chart of Nitinol Superelastic Wire

Wire Diameter Range (mm)

Wire Diameter Range (inches)

Standard Tolerance (mm)

Precision Tolerance (mm)

0.025 to 0.100

0.0010 to 0.0039

±0.005 mm

±0.002 mm

Over 0.100 to 0.500

Over 0.0039 to 0.0197

±0.010 mm

±0.005 mm

Over 0.500 to 1.500

Over 0.0197 to 0.0591

±0.025 mm

±0.010 mm

Over 1.500 to 3.000

Over 0.0591 to 0.1181

±0.050 mm

±0.020 mm

Over 3.000 to 6.000

Over 0.1181 to 0.2362

±0.100 mm

±0.040 mm

Size and Weight Chart of Nitinol Superelastic Wire

Diameter (mm)

Diameter (in)

Cross-Sectional Area (mm²)

Nominal Weight (g/m)

Nominal Weight (g/ft)

Calculated Length per kg (m/kg)

0.05 mm

0.0020 in

0.0020

0.0127

0.0039

78,961

0.10 mm

0.0039 in

0.0079

0.0507

0.0154

19,740

0.20 mm

0.0079 in

0.0314

0.203

0.0618

4,935

0.30 mm

0.0118 in

0.0707

0.456

0.139

2,193

0.40 mm

0.0157 in

0.1257

0.811

0.247

1,234

0.50 mm

0.0197 in

0.1963

1.27

0.386

790

0.80 mm

0.0315 in

0.5027

3.24

0.988

308

1.00 mm

0.0394 in

0.7854

5.07

1.54

197

1.20 mm

0.0472 in

1.1310

7.29

2.22

137

1.50 mm

0.0591 in

1.7671

11.4

3.47

87.7

2.00 mm

0.0787 in

3.1416

20.3

6.18

49.4

2.50 mm

0.0984 in

4.9087

31.7

9.65

31.6

3.00 mm

0.1181 in

7.0686

45.6

13.9

21.9

4.00 mm

0.1575 in

12.5664

81.1

24.7

12.3

5.00 mm

0.1969 in

19.6350

127

38.6

7.9

6.00 mm

0.2362 in

28.2743

182

55.6

5.5

Applications and Industrial Uses of Nitinol Superelastic Wire

  • Medical Device Component Stock (Material Only, Not Finished Devices)
  • Robotic Actuators
  • Aerospace Actuation Components
  • Vibration and Motion Control Systems
  • Flexible Sensors and Precision Mechanisms
  • Eyeglass Frames
  • Flexible Antennas
  • Springs and Clips
  • Jewellery and Consumer Goods
Application Industries

Frequently Asked Questions

Nitinol Superelastic Wire is a nickel-titanium wire that can undergo large deformation and return to its original shape when the applied load is removed.

 

It works through a reversible stress-induced phase transformation from austenite to martensite during loading and back to austenite when the load is removed.

Nitinol Superelastic Wire can typically recover up to about 8% strain, depending on its composition, processing, and operating conditions.

The Af temperature is the temperature at which Nitinol completes its transformation to austenite. Superelastic wire normally operates above its Af temperature.

Yes, it can be customized by wire diameter, length, surface finish, transformation temperature, and mechanical properties according to application requirements.

Superelastic wire springs back when the load is removed and needs no heat. Shape memory wire needs heat to recover. See our Nitinol Shape Memory Wire page.

Bend strain is wire diameter divided by (2 x bend radius + diameter). For about 4% strain, the minimum bend radius is 12 times the wire diameter, so a 0.5 mm wire needs a 6 mm radius.

Pick an Af below the lowest temperature the wire will see. A lower Af gives a higher plateau stress at a given temperature.

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