An alloy
like no other.

 

Nitinol Wire

Fort Wayne Metals manufactures wire products from various grades of Nickel-Titanium or Nitinol commonly used in medical applications  (Nitinol #1, Nitinol #2, Nitinol #4 and Nitinol #8) as well as Nitinol #5, Nitinol #6, and Nitinol #9 for other various applications. All Nitinol grades are available in either the cold worked condition ready for heat treatment or as straightened super-elastic wire.

Each medical grade of Nitinol material is comprised of near equal atomic weight percentage of Nickel and Titanium. With the exception of grades 2 and 3, all Nitinol grades meet the chemistry requirements set forth by ASTM F2063 for use in surgical implants – in fact, they are of higher purity than required by ASTM.

At Fort Wayne Metals, all incoming Nitinol raw materials are inspected to ensure they meet proprietary internal specifications for chemistry, ingot transformation temperature, material homogeneity, and microstructure. Optimized to promote an exceptionally smooth and uniform surface finish quality, all wire products utilize a proprietary single and multi crystalline diamond drawing die technology. After the correct super-elastic heat treatment, medical grade Nitinol will accommodate strain up to 8% without permanent kinking at body temperature. The transformation temperatures and mechanical properties for all of our commercially available grades Nitinol are presented in the table at the bottom of the page.

If your Nitinol product need falls outside of the standard medical grade material or the available product forms, please contact us. Our Nitinol application sales engineers will be glad to help.

Enhanced Nitinol

Depending on your application, you may find it interesting to investigate our enhanced Nitinol products:

  • DPS® Nitinol for higher stiffness in the plateau region of the stress-strain curve
  • USN® Nitinol for higher stiffness in the modulus region of the stress-strain curve
  • Silk® Nitinol for an exceptionally smooth surface without polishing
Nitinol Wire Applications

Our Nitinol wire is used for many different medical and industrial applications. The table below gives some typical engineering applications for each of our standard Nitinol medical grades:

Nitinol #1 Guidewires, stents, stylets, forming mandrels, stone retrieval baskets, orthodontic files, etc.

Nitinol #2* Often used in applications that require a high loading and unloading plateau stress at room temperature. Chromium doped for decreased transformation temperature and increased tensile strength.

Nitinol #3** Applications requiring increased stiffness. Cobalt doped for decreased transformation temperature and increased tensile strength.

Nitinol #4 Provides the best cycling performances at body temperature (37°C).

Nitinol #5 A common application for this alloy is high temperature actuators.

Nitinol #6 A common application for this alloy is high temperature actuators.

Nitinol #8 Typically used in applications that require a phase transformation at body temperature (37°C).

Nitinol #9 For use in very cold temperature environment applications.

* Typical chemical composition: ASTM F2063 Exc. Cr 0.2% to 0.3%

** Typical chemical composition: ASTM F2063 Exc. Co 1% to 2%

Mechanical Properties - Superelastic alloys
  Cold Worked Super-Elastic
Product Ingot As(°C) UTS (psi) Elongation
(%)
UTS (psi) Elongation (%) Loading Plateau (psi) Unloading Plateau (psi) Active Af(°C)
Notes

Permanent Set < 0.5% after strained to 8%

Results are typical for round wire diameters from 0.001" (0.025 mm) to 0.040" (1.016 mm).
All Mechanical testing conducted at 22°C ± 2°C

* Typical target

Niti#1 -35 to -10 200,000 min >4% 180,000 min > 10% > 70,000 > 20,000 +10 to +18
Niti#2 -45 to -15 250,000 min >4% 210,000 min > 10% > 80,000 > 35,000 0 to +18
Niti#3 -80* 200,000 min >5% 190,000 min > 10% > 100,000 > 60,000 -15*
Niti#4 -10 to +10 220,000 min >4% 180,000 min > 10% > 65,000 > 7,000 +14 to +22
Niti#9 ≤ -35 220,000 min >4% 160,000 min > 10% > 75,000 > 25,000 ≤0
Mechanical Properties - Shape Memory Alloys
  Cold Worked Shape Memory
Product Ingot As
(°C)
UTS (psi) Elongation
(%)
UTS (psi) Elongation (%) Loading Plateau (psi) Active Af(°C)
Notes

Permanent Set < 0.5% after strained to 8%

Results are typical for round wire diameters from 0.001" (0.025 mm) to 0.040" (1.016 mm).
All Mechanical testing conducted at 22°C ± 2°C

Niti#5  ≥ +85 220,000 min >3% 160,000 min > 10% N/A ≥ +85
Niti#6 +35 to +85 220,000 min >3% 160,000 min > 10% N/A +40 to +80
Niti#8 +10 to +35 220,000 min >3% 160,000 min > 10% N/A +22 to +40
Nitinol #1 - Typical Chemistry for Surgical Implants

For more detailed specifications on Nitinol Wire please click here.

  ASTM F2063
Nickel 54.5 - 57.0 wt. %
Carbon 500 ppm max.
Nitrogen  + Oxygen 500 ppm max.
Hydrogen 50 ppm max.
Titanium Balance
Certification Data Package
  • UTS-Elongation
  • Upper and lower plateau stress (SE only)
  • Fully annealed ingot transformation measured by DSC
  • Wire transformation measured by Bend and Free Recovery (SE only)
  • Multiple test temperatures available i.e. 22°C ±2°C or 37°C ±2°C
  • Permanent set after straining to 6% or 8% strain (SE only)
  • Multiple gauge length and crosshead speeds
  • Chemical analysis
Nitinol Product Forms
  • Round Wire: 0.0005" to 0.250"
  • Flat Wire: Aspect Ratio: W/T ~ 30
  • Minimum Thickness: 0.0003"
  • Maximum Width: 0.450"
  • Turkshead: Square, Rectangular
  • Custom Shapes: A wide variety of shaped cross-sectional wire
  • Stranded Cables: 1x3, 1x7, 1x19, Materials Blends, etc.
  • DFT®: Composites manufactured with a Nitinol core or a clad jacket
Surface Finishes Available
  • Light Oxide: Diamond drawn surface
  • Dark Oxide: Diamond drawn surface
  • Etched: Chemical removal of oxide layer - will retain smooth surface
  • Pickled: Chemical removal of oxide layer along with a slight amount of base metal - surface will have a rough texture
  • Etched and Mechanically Polished: Chemical removal of oxide layer followed by mechanical polish - surface will have stainless steel appearance (although at >40x magnification, micro scratches will be present
  • Smooth Oxide Free: Available for Silk™ Nitinol only. Surface roughness below 3µin RMS. Eliminates need for mechanical or electropolishing- smooth surface. Absence of any visible oxide.
  • *If you would like to receive a sample of a specific size or surface finish please contact us*
Additional Services Available