Nitinol Shape Memory Wire Manufacturer and Supplier in India

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Nitinol Shape Memory Wire is a nickel-titanium (NiTi) alloy wire which can recover to a set shape, or can be made to contract against a load when heated. The wire is in a lower temperature martensite state and can be bent into a desired shape. It changes back to austenite when heated within its transformation temperature range and restarts to return to its programmed shape, creating recovery force if held back of course. The austenite finish (Af) temperature is the temperature at which complete shape recovery is achieved and is therefore the first temperature to look at when choosing a wire. The wire is made from ASTM F2063 Nitinol, and is available in custom diameters and lengths. Sachin Steel Centre is capable of manufacturing and supplying Nitinol Shape Memory Wire as per your requirements which is provided with the material test certificate for industrial and research applications.

Table Of Content

Specifications of Nitinol Shape Memory Wire
Chemical Compositions of Nitinol Shape Memory Wire
Nitinol Shape Memory Wire Mechanical Properties
Physical Properties of Nitinol Shape Memory Wire
Electrical Resistance of Nitinol Shape Memory Wire
Nitinol Shape Memory Wire Size Chart
Applications and Industrial Uses of Nitinol Shape Memory Wire
Frequently Asked Questions

Technical Data

Specifications of Nitinol Shape Memory Wire

Parameter	Specification
Material	Nickel titanium (NiTi, Nitinol), Ni 54.5 to 57.0 weight percent, Ti balance
Standard	ASTM F2063 / ASME SF2063 (wrought binary NiTi), edition [Sachin to confirm]
Form	Round wire; supplied straight, coiled, or wound on spools/reels
Behaviour	Thermal Shape Memory (one-way thermal activation) at temperatures below Af, returning to programmed shape upon heating above Af
Af Range (Austenite Finish)	+35 to +95 °C (set by composition and heat treatment; choose the Af for your actuator—see Choosing the Af temperature)
Diameter Range	0.025 to 3.0 mm (0.001 to 0.118 in); custom sizes on request
Length & Supply	Spools: 100 m to 5000 m (depending on diameter) Coils: 5 m to 100 m Cut Lengths: 1000 mm, 2000 mm, 3000 mm, or custom cut lengths
Condition	As-drawn, straight-annealed, or heat-set / shape-set to customer specification
Diameter Tolerance	Below 0.10 mm: ±0.002 mm 0.10 to 0.50 mm: ±0.005 mm Over 0.50 to 1.50 mm: ±0.015 mm Over 1.50 mm: ±0.025 mm
Surface Finish	Black oxide, pickled, chemically etched, centerless ground, or light-polished
Density	6.45 g/cm³ (0.233 lb/in³)
Testing	Af by Differential Scanning Calorimetry (ASTM F2004) or Bend & Free Recovery (ASTM F2082). Mechanical tension testing per ASTM F2516. Chemical analysis per lot.
Certification	EN 10204 3.1 material test certificate (MTC) confirming chemistry and mechanical results per lot, with Af result [confirm]

Chemical Composition of Nitinol Shape Memory Wire

Element	Min (wt %)	Max (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 Shape Memory Wire

Property	Austenite (Above A_f)	Martensite (Below M_f)	Design Context & Notes
Young’s Modulus (E)	~83 GPa	~26 to 48 GPa	Stiffer austenitic state upon thermal activation.
Yield Strength (σ_y)	195 to 690 MPa	70 to 140 MPa	Low martensitic yield plateau allows easy low-temperature cold deformation.
Ultimate Tensile Strength (UTS)	~895 MPa (annealed), up to ~1900 MPa (cold worked)	~895 MPa (annealed), up to ~1900 MPa (cold worked)	Diameter band, cold work reduction, and heat treatment dependent.
Recoverable Strain (one-time)	Up to ~8%	Up to ~8%	Maximum theoretical single-cycle strain recovery.
Working Strain (repeated actuation)	2% to 4% maximum	2% to 4% maximum	Recommended working strain for multi-thousand cycle actuation.
Poisson’s Ratio (ν)	~0.33	~0.33	Standard isotropic elastic contraction factor.

Physical Properties of Nitinol Shape Memory Wire

Property	Metric Value	Imperial Value
Density	6.45 g/cm³	0.233 lb/in³
Melting Point	~1300 to 1310 °C	~2370 to 2390 °F
Electrical Resistivity (martensite)	~70 to 80 µΩ·cm	~28 to 31 µΩ·in
Electrical Resistivity (austenite)	~80 to 100 µΩ·cm	~31 to 39 µΩ·in
Thermal Conductivity (austenite)	~18 W/(m·K)	~10.4 BTU/(ft·h·°F)
Coefficient of Thermal Expansion (martensite)	~6.6 × 10⁻⁶ /°C	~3.7 × 10⁻⁶ /°F
Coefficient of Thermal Expansion (austenite)	~11.0 × 10⁻⁶ /°C	~6.1 × 10⁻⁶ /°F
Specific Heat	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
Poisson’s Ratio	~0.33	~0.33

Electrical Resistance of Nitinol Shape Memory Wire

Wire Diameter (mm)	Resistance in Martensite (Ω/m)	Resistance in Austenite (Ω/m)
0.05 mm	407	509
0.10 mm	102	127
0.15 mm	45.3	56.6
0.20 mm	25.5	31.8
0.25 mm	16.3	20.4
0.30 mm	11.3	14.1
0.50 mm	4.07	5.09
0.75 mm	1.81	2.26
1.00 mm	1.02	1.27

Nitinol Shape Memory Wire Size Chart

Diameter (mm)	Diameter (in)	Area (mm²)	Nominal Weight (g/m)	Nominal Weight (g/ft)	Calculated Length per kg (m/kg)
0.025 mm	0.0010 in	0.00049	0.00317	0.00097	315,842
0.050 mm	0.0020 in	0.00196	0.0127	0.00386	78,961
0.075 mm	0.0030 in	0.00442	0.0285	0.00869	35,094
0.100 mm	0.0039 in	0.00785	0.0507	0.0154	19,740
0.150 mm	0.0059 in	0.01767	0.114	0.0347	8,773
0.200 mm	0.0079 in	0.03142	0.203	0.0618	4,935
0.250 mm	0.0098 in	0.04909	0.317	0.0965	3,158
0.300 mm	0.0118 in	0.07069	0.456	0.139	2,193
0.400 mm	0.0157 in	0.12566	0.811	0.247	1,234
0.500 mm	0.0197 in	0.19635	1.27	0.386	789.6
0.750 mm	0.0295 in	0.44179	2.85	0.869	350.9
1.000 mm	0.0394 in	0.78540	5.07	1.54	197.4
1.500 mm	0.0591 in	1.76715	11.4	3.47	87.7
2.000 mm	0.0787 in	3.14159	20.3	6.18	49.4
3.000 mm	0.1181 in	7.06858	45.6	13.9	21.9

Applications and Industrial Uses of Nitinol Shape Memory Wire

Thermal Actuators
Temperature-Controlled Valves
Medical Devices and Surgical Instruments
Orthodontic Devices
Robotic Actuation Systems
Aerospace Actuation Mechanisms
Automotive Thermal Actuators
Safety and Release Mechanisms

Frequently Asked Questions

What is a Nitinol Shape Memory Wire?

A Nitinol Shape Memory Wire is a nickel-titanium alloy wire that can recover its programmed shape when heated through its transformation temperature range.

How does Nitinol Shape Memory Wire work?

When heated, the wire transforms from martensite to austenite and returns toward its previously programmed shape.

What is the shape memory effect in Nitinol wire?

The shape memory effect is the ability of Nitinol wire to recover its original programmed shape after deformation when heated.

What is the difference between Nitinol Shape Memory Wire and Superelastic Nitinol Wire?

Shape memory wire requires heating for shape recovery, while superelastic Nitinol wire recovers its shape when the applied load is removed.

Does Nitinol Shape Memory Wire require heating to recover its shape?

Yes, shape memory wire generally requires heating above its transformation temperature to recover its programmed shape.

How do I heat Nitinol shape memory wire?

Use hot water or air, or pass an electric current through it. Use the resistance per metre table to size the supply.

How do I choose the Af of shape memory wire?

Pick an Af above the highest temperature at which the wire must stay soft and below the temperature your heater reaches.