Nitinol Rods & Bars

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Nitinol Rods & Bars are round, square and hexagonal products made from nickel titanium shape memory alloy for applications that require controlled recovery, superelasticity, high strength and resistance to repeated deformation. Depending on composition and thermomechanical treatment, NiTi material can be supplied for shape memory or superelastic performance, with the transformation temperature selected according to the intended application. Nitinol round bar, Nitinol square bar and Nitinol hex bar are suitable starting forms for precision machining, medical components, actuators, robotics, valves and other specialised components. Sachin Steel Centre supplies Nitinol rods and bars in customer specified dimensions and material conditions, with technical documentation available according to project requirements.

Table Of Content

Nitinol Rods & Bars Specification
Chemical Composition of Nitinol Rod and Bars
Nitinol Bars & Rods Mechanical Properties
Applications of Nitinol Rods & Bars
Frequently Asked Questions

Technical Data

Nitinol Rods & Bars Specification

Specification	Nitinol Rods & Bars
Material	Nickel Titanium Shape Memory Alloy
Primary ASTM specification	ASTM F2063
Current ASTM edition	ASTM F2063 26
Available forms	Round rod, round bar, square bar and hex bar
ASTM F2063 nickel range	54.5% to 57.0% by weight
ASTM mill product diameter range	5.50 mm to 94.0 mm
Manufacturing condition	Hot finished or cold finished material according to specification
Heat treatment	Annealed or heat treated according to required material condition
Surface options	Oxidised, descaled, pickled, blasted, machined, ground, mechanically polished or electropolished as applicable
Length	Cut length or customer specified length
A_f temperature	Specified according to application and agreed material condition
Inspection documents	Chemical and mechanical test documentation according to order requirements
Product forms	Nitinol round bar, Nitinol square bar and Nitinol hex bar

Chemical Composition of Nitinol Rod and Bars

Element	Typical requirement for ASTM F2063 material	Function
Nickel	54.5% to 57.0% by weight	Controls transformation behaviour and contributes to superelastic and shape memory response
Titanium	Balance	Forms the nickel titanium matrix responsible for the characteristic transformation behaviour
Other intentional alloy additions	None under the ASTM F2063 material scope	The specified alloy is based on nickel and titanium

Nitinol Bars & Rods Mechanical Properties

Material condition	Ultimate tensile strength	Elongation	Upper plateau stress	Permanent set after 6% strain	Active A_f temperature
A	≥1300 MPa	≥10%	≥480 MPa	<0.5%	10 ± 7 °C
B	≥1150 MPa	≥10%	≥440 MPa	<0.5%	17 ± 7 °C
C	≥1000 MPa	≥10%	≥400 MPa	<0.5%	25 ± 5 °C
D	≥950 MPa	≥10%	≥300 MPa	<0.5%	35 ± 5 °C
E	≥550 MPa	≥15%	≥200 MPa	<0.5%	35 ± 8 °C to 110 ± 8 °C

Applications of Nitinol Shape Memory and Superelastic Bars

Nitinol rods and bars are used where shape recovery, superelasticity and controlled transformation behaviour provide a functional advantage.

Medical Devices: Stent components, specialised surgical instruments, guide components and other medical device parts.
Orthopaedic and Dental Components: Specialised implants, orthodontic components and dental applications requiring controlled recovery.
Actuators: Compact temperature activated mechanisms, valves and switches.
Robotics: Flexible mechanisms, miniature actuators and components requiring repeated deformation.
Aerospace: Specialised actuators, adaptive mechanisms and components where low mass and functional movement are important.
Industrial Equipment: Couplings, dampers, seals, temperature control components and specialised engineering parts.

Frequently Asked Questions

What is the difference between Nitinol Grade 55 and Grade 60?

Grade 55 and Grade 60 are commonly used commercial descriptions rather than ASTM F2063 grade numbers. Grade 55 is generally associated with shape memory performance and a lower active Af temperature, closest to material condition A in the table above, while Grade 60 is commonly associated with superelastic performance and a higher active Af temperature, closest to material condition E. The exact material condition and Af temperature should be confirmed from the material certificate rather than the Grade 55 or Grade 60 label alone.

What does Nitinol stand for?

Nitinol is derived from the Naval Ordnance Laboratory, referring to the nickel-titanium alloy developed through research associated with the Naval Ordnance Laboratory.

What forms are available for Nitinol rods and bars?

Common product forms include Nitinol round bar, Nitinol round rod, Nitinol square bar and Nitinol hex bar. Diameter, section size, and length can be specified according to the required application and available production route.

What standard governs Nitinol rods and bars?

ASTM F2063 is the principal ASTM specification covering wrought nickel-titanium bar and other specified mill product forms for medical devices and surgical implants. The current active edition is ASTM F2063 26.

Can the Af temperature be customised?

Yes. The required Af temperature can be specified according to the application. Transformation temperature depends on composition and thermomechanical processing, so it should be confirmed using appropriate transformation testing and documented for the supplied material.

Nitinol Products category, Titanium Alloy range, Ti 6Al 7Nb Titanium Plate and Sheets and Titanium Grade 2 Sheet and Plate.

Request a Quote for Nitinol Rods & Bars

Tell us your required Nitinol grade or material condition, product form, diameter or section size, length, Af temperature and quantity. Our team can review the requirement and provide the appropriate material and documentation for your application. Sachin Steel Centre can review the requirement and help identify the appropriate Nitinol Sheet or Nitinol Plate for the intended application.

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